LM1458Dual general-purpose operational amplifier

Two analog amplifiers, with independent feedback and shared rails.

Manufacturer-referenced

Texas Instruments · LM1458N/NOPB

PDIP-8SNOSBU4D · March 2013

LM1458 contains two internally compensated, general-purpose operational amplifiers in one eight-pin package. Each amplifier has its own input pair and output, while both share the positive and negative supply rails. External feedback determines the useful closed-loop gain. This page uses the commercial LM1458N/NOPB PDIP-8 and LM1458M/NOPB SOIC-8 parts, specified over 0 to 70°C. The pinout and downloadable PCB footprint follow the selected package; LM1558 military-temperature limits are not used. The example applies 0.50 V to both channels on ±15 V rails. A 20 kΩ / 10 kΩ feedback network gives channel A an ideal output of 1.50 V, while channel B follows at 0.50 V. Real errors depend on offset, input bias current, resistor tolerance, load and signal frequency.

Real View

LM1458N/NOPB black package with silver leads and readable markings.

Pinout

LM1458PDIP-8Top view

PCB Footprint

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3D View

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8Physical pins LM1458N/NOPBPDIP-8 Manufacturer-referencedTexas Instruments

Pin diagram

Select a pin to explore its connection

Package map

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LM1458PDIP-8Top view

Click a lead or use the arrow keys. Top view

PIN 1 · Analog outputs

OUT1

Analog output

Function

Channel A output.

How to connect

Return to IN1− through 20 kΩ; connect a high-impedance meter.

Key specifications

Both channels share their power supply but have independent feedback. This is a conventional bipolar op amp: allow input and output headroom, and account for bias-current error.

Electrical test rails±15 V · split supply

Independent amplifiers2 Internally compensated

LM1458 ambient0–70 °C

Typical input offset1 mV · 25°C

Operating profile

Supply, signals and operating conditions

LM1458 operating profile
Parameter	Value	Conditions / notes
Selected package	PDIP-8	LM1458N/NOPB
Independent channels	2	Separate feedback; shared rails
Example outputs	1.50 / 0.50	V · ideal A / B

Package details

LM1458N/NOPB · PDIP-8

Selected package

Selected LM1458 physical package
Property	Details
Manufacturer	Texas Instruments
Part number	LM1458N/NOPB
Package	PDIP-8
Connections	8 pins
Mounting	Through-hole
Lead pitch	2.54 mm
Package code	dip
Thermal reference	Board and package dependent; see manufacturer data

Operating conditions and stress limits

LM1458 commercial grade

Manufacturer specifications 7 parameters

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Parameter	Value	Conditions / notes
Specified ambient range	0 to +70°C	LM1458, not LM1558
Electrical-characterization supply	±15 V	The example follows this test condition
Absolute maximum supply	±18 V	Stress limit, not an operating recommendation
Absolute differential input	±30 V	Respect input and supply conditions
Absolute input voltage	±15 V	At lower supply voltages, do not exceed either supply rail
Maximum junction temperature	100°C	LM1458 rating
PDIP power dissipation limit	400 mW	Derate using the manufacturer guidance and actual mounting

This legacy document does not provide a separate recommended minimum supply. No unverified low-voltage range is inferred.

Input accuracy and bias current

±15 V · 25°C unless stated

Manufacturer specifications 5 parameters

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Parameter	Value	Conditions / notes
Input offset voltage	1 mV typical; 6 mV maximum	RS ≤10 kΩ; 7.5 mV maximum over temperature
Input offset current	80 nA typical; 200 nA maximum	300 nA maximum over temperature
Input bias current	200 nA typical; 500 nA maximum	0.8 µA maximum over temperature
Input resistance	0.3 MΩ minimum; 1 MΩ typical	25°C characterization
Total supply current	3 mA typical; 5.6 mA maximum	Both amplifiers; ±15 V; 25°C

Choose source and feedback resistances with input-current error in mind.

Gain, common mode and output swing

±15 V rails; respect load conditions

Manufacturer specifications 6 parameters

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Parameter	Value	Conditions / notes
Large-signal open-loop gain at 25°C	20 V/mV minimum; 160 V/mV typical	VO=±10 V; RL≥2 kΩ
Open-loop gain over temperature	15 V/mV minimum	Same output and load condition
Input common-mode range	±12 V minimum	Within ±15 V rails
Output swing at RL≥10 kΩ	±12 V minimum; ±14 V typical	Light-load swing
Output swing at RL≥2 kΩ	±10 V minimum; ±13 V typical	Heavier loading reduces headroom
Example output range	1.50 V and 0.50 V nominal	Light DC loads; well inside the specified swing

Typical output headroom is not a guaranteed limit.

Rejection, stability and practical limits

Use the source document’s actual guarantees

Manufacturer specifications 7 parameters

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Parameter	Value	Conditions / notes
Common-mode rejection	70 dB minimum; 90 dB typical	RS≤10 kΩ
Supply-voltage rejection	77 dB minimum; 96 dB typical	RS≤10 kΩ
Frequency compensation	Internal	No external compensation required
Supply bypass	100 nF from each rail to 0 V	Local bypass; add bulk decoupling as needed
PDIP junction-to-ambient estimate	187°C/W	Manufacturer package estimate; mounting dependent
Short-circuit protection	Included	Check dissipation; do not use a short as a normal load
Bandwidth, slew rate and noise	No numeric claim on this page	Not specified in the selected manufacturer electrical table

The 0 V signal midpoint is distinct from the negative supply pin.

Two-channel amplifier example

±15 V rails · 0 V signal reference

Manufacturer specifications 7 parameters

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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

The 0 V reference is not the negative supply pin. Keep both rail-bypass loops short.

Physical pin reference

LM1458N/NOPB · PDIP-8

Manufacturer specifications 5 parameters

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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

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

LM1458 working principle: illustrated functional stages, basic circuit and connections — Select the diagram to read it at full resolution.

How it works

3 stages · Explore one step at a time

Step 1 / 3

Compare each input pair

Each bipolar differential input pair compares the applied signal against its feedback voltage. Input bias currents flowing in source and feedback resistances introduce additional voltage error.

Step 2 / 3

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.

Step 3 / 3

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.

LM1458N/NOPB on ±15 V rails. VIN 0.50 V connects to pins 3 and 5. Pin 1 feeds pin 2 through 20 kΩ; 10 kΩ joins pin 2 to 0 V. Pin 7 joins pin 6 directly. Both supply rails have 100 nF bypass to 0 V. — All VIN labels share one signal. All ground symbols are the 0 V supply midpoint.

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.

Two Bipolar-input amplifier channels inside a compact LM1458 IC. A: positive 3, negative 2, output 1. B: positive 5, negative 6, output 7. Shared supplies 8 and 4. — Functional cutaway; internal compensation is included. External feedback sets the gain.

Explore the circuit

Select a stage to see its role and connections

Input stages

Each bipolar differential input pair compares the applied signal against its feedback voltage. Input bias currents flowing in source and feedback resistances introduce additional voltage error.

Gain and compensation

Each channel has an internal voltage-gain path and frequency compensation.

Output drivers

The output stage drives the feedback network and load. Neither input common-mode range nor output swing reaches the rails. Short-circuit protection is a fault feature, not a useful load-current specification.

Selected packagePDIP-8LM1458N/NOPB

Physical connections8 pinsPackage-specific numbering

Reference collection7 tables37 parameters & pin functions