component
LM311PSR
Public Made by Adomby adom
Texas Instruments Comparators, SO-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLM311PSR
Texas Instruments · Comparators · SO-8
LM311PSR from Texas Instruments, in a SO-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | EMIT OUT | output | Open-drain output emitter from NPN output transistor stage, isolated from VCC-, with maximum voltage rating of 30 V from emitter to VCC-. |
| 2 | IN+ | input | Noninverting input of comparator with common-mode input voltage range of −14.7 to 13.8 V and maximum differential input voltage of ±30 V. |
| 3 | IN- | input | Inverting input of comparator with common-mode input voltage range of −14.7 to 13.8 V and maximum differential input voltage of ±30 V. |
| 4 | VCC- | power_in | Negative power supply pin with minimum rating of −18 V and maximum differential supply voltage (VCC+ − VCC−) of 36 V. |
| 5 | BALANCE | input | Offset balance input pin for external offset voltage adjustment or trimming via connection to potentiometer or resistor network. |
| 6 | BAL/STRB | input | Strobe control input pin; must be current driven at −3 to −5 mA; pulling low disables output regardless of input state. |
| 7 | COL OUT | output | Open-drain output collector from NPN output transistor stage with maximum voltage rating of 40 V from collector to VCC- for LM311. |
| 8 | VCC+ | power_in | Positive power supply pin with maximum rating of +18 V and maximum differential supply voltage (VCC+ − VCC−) of 36 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SO-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
LM311PSR - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files:
lm311psr-etched.step/lm311psr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm311psr.step/lm311psr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (42 pp, sha256
1877bb45737cb7e8, retrieved 2026-09-24, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).