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OPA2134Dual FET-input audio operational amplifier
Two quiet analog channels for audio and precision signals.
OPA2134 contains two FET-input operational amplifiers optimized for low-noise, low-distortion analog signal conditioning. Each channel has independent inputs, output and external feedback while sharing its positive and negative supply rails. Its input bias current is only a few picoamperes typically at room temperature. The specified audio distortion is measured under particular gain, frequency, amplitude and load conditions; it does not describe every possible circuit. This reference follows TI revision B and the dual-channel PDIP-8 and SOIC-8 packages. The example uses ±15 V rails, one gain-of-three channel and one voltage follower. The device is not rail-to-rail, so both input and output headroom matter.
8Physical pins
OPA2134PAPDIP-8
Manufacturer-referencedTexas Instruments
Pin diagram
Select a pin to explore its connection
Highlight
OPA2134PAPDIP-8Top view
OPA2134UASOIC-8Top view
Click a lead or use the arrow keys. Top view
PIN 1 · Analog outputs
Analog outputOUT1
Function
Channel A output.
How to connect
Return to IN1− through 20 kΩ; connect a high-impedance meter.
PIN 2 · Analog inputs
Inverting inputIN1−
Function
Channel A negative-feedback node.
How to connect
Join 20 kΩ from OUT1 and 10 kΩ to signal ground.
PIN 3 · Analog inputs
Non-inverting inputIN1+
Function
Channel A signal input.
How to connect
Apply VIN = 0.50 V relative to the 0 V midpoint.
PIN 4 · Supply
Negative supplyV−
Function
Negative rail shared by both amplifiers.
How to connect
Connect −15 V; bypass locally to 0 V with 100 nF.
PIN 5 · Analog inputs
Non-inverting inputIN2+
Function
Channel B signal input.
How to connect
Connect to the same VIN in the illustrated follower.
PIN 6 · Analog inputs
Inverting inputIN2−
Function
Channel B feedback input.
How to connect
Connect directly to OUT2 pin 7.
PIN 7 · Analog outputs
Analog outputOUT2
Function
Channel B output.
How to connect
Connect to IN2−; leave unloaded or use a high-impedance instrument.
PIN 8 · Supply
Positive supplyV+
Function
Positive rail shared by both amplifiers.
How to connect
Connect +15 V; bypass locally to 0 V with 100 nF.
Key specifications
Independent feedback paths let one channel amplify while the other buffers. Keep the signal within the input common-mode range and output swing.
Total supply span5–36 V · recommended
Gain bandwidth8 MHz typical
Input voltage noise8 nV/√Hz at 1 kHz · typical
Ambient range−40 to +85 °C
Package details
OPA2134PA · PDIP-8
| Property | Details |
|---|---|
| Manufacturer | Texas Instruments |
| Part number | OPA2134PA |
| Package | PDIP-8 |
| Connections | 8 pins |
| Mounting | Through-hole |
| Lead pitch | 2.54 mm |
| Package code | PDIP-8 |
| Thermal reference | See operating and package limits |
Operating conditions
TI OPA2134 · Rev B
Manufacturer specifications 6 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Recommended split supplies | ±2.5 to ±18 V | ±15 V nominal test condition |
| Recommended single supply | 5–36 V | Signal reference must provide appropriate headroom |
| Recommended temperature | −40 to +85°C | Do not substitute the absolute-rating range |
| Input common-mode interval | V− + 2.5 V to V+ − 3.5 V | At ±15 V: −12.5 V to +11.5 V |
| Example supply | +15 V / 0 V / −15 V | 0 V is the shared signal midpoint |
| Absolute supply ceiling | 36 V total | Allow for supply tolerance and transients |
No specifications match. Try a parameter name or a unit.
The signal inputs cannot be assumed to work at either rail.
DC and input characteristics
±15 V, 25°C, unless stated
Manufacturer specifications 8 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Input offset voltage | ±1 mV typical; ±3.5 mV maximum | Revision B electrical table |
| Offset drift | ±2 µV/°C typical | −40 to +85°C |
| Input bias current | ±5 pA typical; ±100 pA maximum | High-speed test at junction temperature 25°C |
| Input bias over temperature | ±5 nA maximum | −40 to +85°C |
| Input offset current | ±2 pA typical; ±50 pA maximum | 25°C |
| CMRR | 86 dB minimum; 100 dB typical | −12.5 V to +11.5 V common mode |
| Quiescent current per channel | 4 mA typical; 5 mA maximum | No output load |
| Open-loop gain | 104 dB minimum; 120 dB typical | 2 kΩ load, −13.8 V to +13.5 V output |
No specifications match. Try a parameter name or a unit.
Use the stated revision and conditions; product-page summaries may differ from the detailed table.
Audio and noise
Typical values at the manufacturer test conditions
Manufacturer specifications 6 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| THD + noise | 0.00008% | 1 kHz, gain 1, 3 Vrms output, 2 kΩ load |
| THD + noise with heavier load | 0.00015% | Same conditions, 600 Ω load |
| Input voltage-noise density | 8 nV/√Hz | 1 kHz |
| Integrated input voltage noise | 1.2 µVrms | 20 Hz–20 kHz |
| Input current-noise density | 3 fA/√Hz | 1 kHz |
| Channel separation | 126 dB typical | 20 kHz, 2 kΩ load |
No specifications match. Try a parameter name or a unit.
These values describe the IC test setup, not the total noise or distortion of a finished audio system.
Bandwidth, settling and output
±15 V reference conditions
Manufacturer specifications 6 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Gain-bandwidth product | 8 MHz typical | Closed-loop bandwidth also depends on noise gain |
| Slew rate | ±20 V/µs typical | Specified by design |
| Settling to 0.1% / 0.01% | 0.7 µs / 1 µs typical | 10 V step, gain 1, 100 pF load |
| Output swing with 2 kΩ load | V− + 1.2 V to V+ − 1.5 V | Specified output-voltage interval |
| Output swing with 10 kΩ load | V− + 0.5 V to V+ − 1.2 V | Lighter load permits greater swing |
| Short-circuit current | 36 mA source / −30 mA sink typical | Fault characterization, not a normal load target |
No specifications match. Try a parameter name or a unit.
Check stability and output current when adding cables or capacitive loads.
Practical design notes
Stable feedback and low-noise layout
Manufacturer specifications 6 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Supply bypass | 100 nF from each rail to signal GND | Place close to pins 8 and 4; add suitable local bulk storage |
| Feedback loops | Keep short and separated from noisy outputs | Channel A: pins 1–2; channel B: pins 7–6 |
| High source impedance | Bias-current and leakage errors still apply | Clean the board and avoid unnecessarily high feedback resistance |
| Single-supply audio | Provide a suitable midpoint reference | Ground is not automatically a valid signal bias |
| Input outside the rails | Requires current limiting | Manufacturer absolute input-current limit is ±10 mA |
| Package distinction | OPA2134 is the dual version | OPA134 and OPA4134 use different physical maps |
No specifications match. Try a parameter name or a unit.
The reference circuit is a light-load gain demonstration, not a headphone or loudspeaker power amplifier.
Two-channel amplifier example
±15 V rails · 0 V signal reference
Manufacturer specifications 7 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Input VIN | 0.50 V | Pins 3 and 5; common signal ground |
| Channel A feedback | 20 kΩ | OUT1 pin 1 to IN1− pin 2 |
| Channel A ground resistor | 10 kΩ | IN1− pin 2 to 0 V |
| Channel A ideal output | 1.50 V | 0.50 × (1 + 20 / 10) |
| Channel B feedback | Direct connection | OUT2 pin 7 to IN2− pin 6 |
| Channel B ideal output | 0.50 V | Unity-gain follower |
| Bypass capacitors | 100 nF per rail | Each supply rail to the 0 V midpoint |
No specifications match. Try a parameter name or a unit.
The 0 V reference is not the negative supply pin. Keep both rail-bypass loops short.
Physical pin reference
OPA2134PA · PDIP-8
Manufacturer specifications 5 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Lead pitch | 2.54 mm | Through-hole |
| Channel A | OUT1 1; IN1− 2; IN1+ 3 | Independent feedback loop |
| Channel B | IN2+ 5; IN2− 6; OUT2 7 | Independent feedback loop |
| Supply | V− 4; V+ 8 | Shared by both channels |
| Package orientation | Top view; pin 1 at the marker | Counterclockwise numbering |
No specifications match. Try a parameter name or a unit.
This dual-amplifier pinout differs from single amplifiers such as TL081 or LM741.
Connections by function
Select a pin for its function, connection guidance and electrical notes.
Analog outputs2 pins
Analog inputs4 pins
Supply2 pins
Analog outputs2 pins
Analog inputs4 pins
Supply2 pins
OPA2134 at a glance
Follow the labeled connections and functional stages
How it works
3 stages · Explore one step at a time
Compare each input pair
The true FET input stage provides high input impedance and low room-temperature bias current. Source impedance, board contamination and rising temperature can still create measurable errors.
Set two different gains
Channel A uses 20 kΩ feedback and 10 kΩ to the 0 V midpoint, giving a gain of three. Channel B directly feeds its output back to its negative input, giving unity gain.
Check headroom and speed
With a 0.50 V input, the ideal outputs are 1.50 V and 0.50 V. Real output also depends on input offset, resistor accuracy, loading, noise and signal frequency.
Step 1 of 3
OPA2134 in a circuit
A gain-of-three channel beside a unity-gain follower.
Connect it, step by step
Follow the component values and pin connections
Connect power
Use +15 V at pin 8 and −15 V at pin 4, with a 100 nF bypass from each rail to signal ground.
Wire the feedback
Add the 20 kΩ / 10 kΩ network to channel A and join pins 7 and 6 for channel B.
Read both outputs
At a nominal input of 0.50 V, expect about 1.50 V from A and 0.50 V from B under light DC loading.
Inside OPA2134
Two FET differential inputs, compensated gain paths and output drivers.
Explore the circuit
Select a stage to see its role and connections
Input stages
The true FET input stage provides high input impedance and low room-temperature bias current. Source impedance, board contamination and rising temperature can still create measurable errors.
Gain and compensation
Each channel has an internal voltage-gain path and frequency compensation.
Output drivers
Each output can drive an appropriate load inside its specified swing. Leave supply headroom and check capacitive-load stability; the short-circuit current is not a normal continuous-load rating.
Selected packagePDIP-8OPA2134PA
Physical connections8 pinsPackage-specific numbering
Reference collection8 tables44 parameters & pin functions
Pin reference
Signal names, electrical functions and connection guidance
Physical pin numbers8 pins
Scroll within the table to see all columns and rows.
| Pin | Signal | Type | Function & connection |
|---|---|---|---|
| OUT1 | Analog output | Channel A output.Connection guidanceReturn to IN1− through 20 kΩ; connect a high-impedance meter. | |
| IN1− | Inverting input | Channel A negative-feedback node.Connection guidanceJoin 20 kΩ from OUT1 and 10 kΩ to signal ground. | |
| IN1+ | Non-inverting input | Channel A signal input.Connection guidanceApply VIN = 0.50 V relative to the 0 V midpoint. | |
| V− | Negative supply | Negative rail shared by both amplifiers.Connection guidanceConnect −15 V; bypass locally to 0 V with 100 nF. | |
| IN2+ | Non-inverting input | Channel B signal input.Connection guidanceConnect to the same VIN in the illustrated follower. | |
| IN2− | Inverting input | Channel B feedback input.Connection guidanceConnect directly to OUT2 pin 7. | |
| OUT2 | Analog output | Channel B output.Connection guidanceConnect to IN2−; leave unloaded or use a high-impedance instrument. | |
| V+ | Positive supply | Positive rail shared by both amplifiers.Connection guidanceConnect +15 V; bypass locally to 0 V with 100 nF. |
No pins match these filters. Try another signal name or reset the filters.
Operating conditions
TI OPA2134 · Rev B
Manufacturer-referenced values6 parameters
Scroll within the table to see all columns and rows.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Recommended split supplies | ±2.5 to ±18 V | ±15 V nominal test condition |
| Recommended single supply | 5–36 V | Signal reference must provide appropriate headroom |
| Recommended temperature | −40 to +85°C | Do not substitute the absolute-rating range |
| Input common-mode interval | V− + 2.5 V to V+ − 3.5 V | At ±15 V: −12.5 V to +11.5 V |
| Example supply | +15 V / 0 V / −15 V | 0 V is the shared signal midpoint |
| Absolute supply ceiling | 36 V total | Allow for supply tolerance and transients |
No specifications match. Try a parameter name or a unit.
The signal inputs cannot be assumed to work at either rail.
DC and input characteristics
±15 V, 25°C, unless stated
Manufacturer-referenced values8 parameters
Scroll within the table to see all columns and rows.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Input offset voltage | ±1 mV typical; ±3.5 mV maximum | Revision B electrical table |
| Offset drift | ±2 µV/°C typical | −40 to +85°C |
| Input bias current | ±5 pA typical; ±100 pA maximum | High-speed test at junction temperature 25°C |
| Input bias over temperature | ±5 nA maximum | −40 to +85°C |
| Input offset current | ±2 pA typical; ±50 pA maximum | 25°C |
| CMRR | 86 dB minimum; 100 dB typical | −12.5 V to +11.5 V common mode |
| Quiescent current per channel | 4 mA typical; 5 mA maximum | No output load |
| Open-loop gain | 104 dB minimum; 120 dB typical | 2 kΩ load, −13.8 V to +13.5 V output |
No specifications match. Try a parameter name or a unit.
Use the stated revision and conditions; product-page summaries may differ from the detailed table.
Audio and noise
Typical values at the manufacturer test conditions
Manufacturer-referenced values6 parameters
Scroll within the table to see all columns and rows.
| Parameter | Value | Conditions / notes |
|---|---|---|
| THD + noise | 0.00008% | 1 kHz, gain 1, 3 Vrms output, 2 kΩ load |
| THD + noise with heavier load | 0.00015% | Same conditions, 600 Ω load |
| Input voltage-noise density | 8 nV/√Hz | 1 kHz |
| Integrated input voltage noise | 1.2 µVrms | 20 Hz–20 kHz |
| Input current-noise density | 3 fA/√Hz | 1 kHz |
| Channel separation | 126 dB typical | 20 kHz, 2 kΩ load |
No specifications match. Try a parameter name or a unit.
These values describe the IC test setup, not the total noise or distortion of a finished audio system.
Bandwidth, settling and output
±15 V reference conditions
Manufacturer-referenced values6 parameters
Scroll within the table to see all columns and rows.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Gain-bandwidth product | 8 MHz typical | Closed-loop bandwidth also depends on noise gain |
| Slew rate | ±20 V/µs typical | Specified by design |
| Settling to 0.1% / 0.01% | 0.7 µs / 1 µs typical | 10 V step, gain 1, 100 pF load |
| Output swing with 2 kΩ load | V− + 1.2 V to V+ − 1.5 V | Specified output-voltage interval |
| Output swing with 10 kΩ load | V− + 0.5 V to V+ − 1.2 V | Lighter load permits greater swing |
| Short-circuit current | 36 mA source / −30 mA sink typical | Fault characterization, not a normal load target |
No specifications match. Try a parameter name or a unit.
Check stability and output current when adding cables or capacitive loads.
Practical design notes
Stable feedback and low-noise layout
Manufacturer-referenced values6 parameters
Scroll within the table to see all columns and rows.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Supply bypass | 100 nF from each rail to signal GND | Place close to pins 8 and 4; add suitable local bulk storage |
| Feedback loops | Keep short and separated from noisy outputs | Channel A: pins 1–2; channel B: pins 7–6 |
| High source impedance | Bias-current and leakage errors still apply | Clean the board and avoid unnecessarily high feedback resistance |
| Single-supply audio | Provide a suitable midpoint reference | Ground is not automatically a valid signal bias |
| Input outside the rails | Requires current limiting | Manufacturer absolute input-current limit is ±10 mA |
| Package distinction | OPA2134 is the dual version | OPA134 and OPA4134 use different physical maps |
No specifications match. Try a parameter name or a unit.
The reference circuit is a light-load gain demonstration, not a headphone or loudspeaker power amplifier.
Two-channel amplifier example
±15 V rails · 0 V signal reference
Manufacturer-referenced values7 parameters
Scroll within the table to see all columns and rows.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Input VIN | 0.50 V | Pins 3 and 5; common signal ground |
| Channel A feedback | 20 kΩ | OUT1 pin 1 to IN1− pin 2 |
| Channel A ground resistor | 10 kΩ | IN1− pin 2 to 0 V |
| Channel A ideal output | 1.50 V | 0.50 × (1 + 20 / 10) |
| Channel B feedback | Direct connection | OUT2 pin 7 to IN2− pin 6 |
| Channel B ideal output | 0.50 V | Unity-gain follower |
| Bypass capacitors | 100 nF per rail | Each supply rail to the 0 V midpoint |
No specifications match. Try a parameter name or a unit.
The 0 V reference is not the negative supply pin. Keep both rail-bypass loops short.
Physical pin reference
OPA2134PA · PDIP-8
Manufacturer-referenced values5 parameters
Scroll within the table to see all columns and rows.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Lead pitch | 2.54 mm | Through-hole |
| Channel A | OUT1 1; IN1− 2; IN1+ 3 | Independent feedback loop |
| Channel B | IN2+ 5; IN2− 6; OUT2 7 | Independent feedback loop |
| Supply | V− 4; V+ 8 | Shared by both channels |
| Package orientation | Top view; pin 1 at the marker | Counterclockwise numbering |
No specifications match. Try a parameter name or a unit.
This dual-amplifier pinout differs from single amplifiers such as TL081 or LM741.
No matching rowsTry a pin name, parameter, unit or test condition, or reset the filters.
Audio line stages
Build buffered gain stages with appropriate coupling and output headroom.
Manufacturer application guideActive filters
Use the two channels in independent or cascaded filter sections.
Manufacturer application guideHigh-impedance signal buffers
Buffer compatible sources while controlling leakage, input bias and layout noise.
Manufacturer application guideTake it into ProTech
Find OPA2134 in the Components Library to place its schematic symbol and connect its pins.
Reference page · circuit simulation model not yet availableOpen ProTech