BETASelected packagePDIP-8LM311P
Single differential voltage comparator
LM311 Reference Tables
Search the LM311 pin reference and manufacturer-referenced specification tables.
Package view
Physical connections8 pinsPackage-specific numbering
Reference collection6 tables30 parameters & pin functions
Pin reference
Signal names, electrical functions and connection guidance
Physical pin numbers8 pins
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| Pin | Signal | Type | Function & connection |
|---|---|---|---|
| EMIT | Output emitter | Emitter of the output transistor, separate from the negative supply.Connection guidanceConnect to ground for the illustrated logic output. Do not leave the emitter floating. | |
| IN+ | Non-inverting input | Signal input in the threshold detector.Connection guidanceConnect VIN; keep it within 0.5–3.5 V for the 5 V example. | |
| IN− | Inverting input | Reference input in the threshold detector.Connection guidanceConnect the 2.00 V divider node. | |
| V− | Negative supply | Negative power rail for the comparator.Connection guidanceConnect to ground in the single-supply example. This is a supply pin; it is not internally interchangeable with output emitter pin 1. | |
| BAL | Offset balance | Optional offset-balance connection.Connection guidanceLeave open when offset trimming is not used. | |
| BAL/STB | Balance / strobe | Optional balance and current-driven output-disable connection.Connection guidanceLeave open in this unstrobbed circuit. Do not short to ground. Use the manufacturer’s current-driven strobe network when required. | |
| COL | Output collector | Collector of the output transistor.Connection guidanceAdd 10 kΩ to +5 V and read this node. HIGH requires an external pull-up; this pin sinks current when the transistor is on. | |
| V+ | Positive supply | Positive comparator supply.Connection guidanceConnect +5 V with 100 nF bypass to pin 4. |
No pins match these filters. Try another signal name or reset the filters.
Operating conditions
TI LM311 commercial grade
Manufacturer-referenced values5 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-referenced values6 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-referenced values6 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-referenced values7 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-referenced values6 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.
No matching rowsTry a pin name, parameter, unit or test condition, or reset the filters.