BETARecommended supply3.5–30 V · total span
Single differential voltage comparator
LM311 Specifications
Review LM311 electrical specifications, operating conditions and package details.
Package view
Key specifications
The output collector and emitter are both exposed. The chosen emitter return and external pull-up determine the logic levels.
Typical falling response165 ns · specified test
LM311 ambient0–70 °C
Output contactsC + E Separate collector and emitter
Package details
LM311P · PDIP-8
| Property | Details |
|---|---|
| Manufacturer | Texas Instruments |
| Part number | LM311P |
| 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
TI LM311 commercial grade
Manufacturer specifications 5 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Supply span | 3.5–30 V | V+ minus V− |
| Ambient range | 0 to +70°C | LM311 grade |
| Recommended input range | V− + 0.5 V to V+ − 1.5 V | Subject to the manufacturer supply conditions |
| Inputs in the 5 V example | 0.5–3.5 V | Both VIN and VREF |
| Balance / strobe | Open in the basic circuit | Optional networks shown in the manufacturer PDF |
No specifications match. Try a parameter name or a unit.
Supply range and input range are separate constraints.
Electrical characteristics
±15 V test supply unless stated
Manufacturer specifications 6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Input offset voltage | 2 mV typical; 7.5 mV maximum | 25°C; 10 mV maximum over temperature |
| Input bias current | 100 nA typical; 250 nA maximum | 25°C; 300 nA maximum over temperature |
| Input offset current | 6 nA typical; 50 nA maximum | 25°C; 70 nA maximum over temperature |
| Collector-emitter LOW | 0.23 V typical; 0.4 V maximum | 4.5 V single supply; 8 mA sink; VID = −10 mV |
| Positive supply current | 5.1 mA typical; 7.5 mA maximum | Output LOW; no load; 25°C |
| Negative supply current magnitude | 4.1 mA typical; 5 mA maximum | Output HIGH; no load; 25°C |
No specifications match. Try a parameter name or a unit.
The LOW-voltage test is load dependent. It is not a fixed voltage for every collector current.
Response and output behavior
Manufacturer switching test
Manufacturer specifications 6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| LOW-to-HIGH response | 115 ns typical | ±15 V supply; 100 mV step; 5 mV overdrive |
| HIGH-to-LOW response | 165 ns typical | Same step and overdrive |
| Test output load | 500 Ω to 5 V; 5 pF | Different loading changes delay |
| VIN below VREF | Output transistor ON | Collector pulled toward emitter |
| VIN above VREF | Output transistor OFF | Pull-up creates HIGH |
| No pull-up, output OFF | Floating collector | Not a valid HIGH |
No specifications match. Try a parameter name or a unit.
Near equality, offset and noise can dominate. Typical response is not a guaranteed delay.
5 V threshold detector
A 2.00 V reference and 10 kΩ pull-up
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Reference upper resistor | 30 kΩ | +5 V to VREF |
| Reference lower resistor | 20 kΩ | VREF to ground |
| Reference result | 2.00 V | 5 × 20 / (30 + 20) |
| Signal input | 1.50 V initially | IN+ pin 2 |
| Output pull-up | 10 kΩ | +5 V to collector pin 7 |
| Emitter and negative rail | Pins 1 and 4 to ground | Two distinct terminals |
| Supply bypass | 100 nF | Pins 8–4; short local loop |
No specifications match. Try a parameter name or a unit.
The high-impedance output meter adds negligible loading.
Optional controls and stress limits
LM311P · PDIP-8
Manufacturer specifications 6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Offset trim | Balance pins 5 and 6 | Use the manufacturer network |
| Strobe drive | Current driven, approximately −3 to −5 mA | Do not short the strobe contact to ground |
| Supply absolute maximum | 36 V total | Stress only; recommended maximum 30 V |
| Collector to V− absolute maximum | 40 V for LM311 | The 50 V rating belongs to other family members |
| Storage temperature | −65 to +150°C | Unpowered storage |
| Pin pitch | 2.54 mm | Through-hole |
No specifications match. Try a parameter name or a unit.
Stress ratings do not describe recommended continuous operation.
Connections by function
Select a pin for its function, connection guidance and electrical notes.