component
LM331AN
Public Made by Adomby adom
Texas Instruments V/F And F/V Converters, PDIP-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
markdownLM331AN
Texas Instruments · V/F And F/V Converters · PDIP-8
LM331AN from Texas Instruments, in a PDIP-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 | IOUT | output | Current output of the switched current source, which supplies i = 1.90 V/RS to the timing network and is specified at 116 to 156 µA for LM331AN at RS = 14 kΩ with pin 1 at 0 V (136 µA typical). |
| 2 | IREF | input | Reference current input where the internal band-gap regulates the pin voltage to about 1.9 V (1.7 to 2.08 V for LM331) and the set resistor RS defines the current, with an operating range of 10 to 500 µA. |
| 3 | FOUT | output | Frequency output that is an open-collector output requiring a pullup resistor, with a saturation voltage of 0.5 V maximum at 5 mA and an OFF leakage of 1 µA maximum. |
| 4 | GND | power_in | Ground reference for the device; all voltages are measured with respect to GND = 0 V. |
| 5 | RC | input | R-C filter input connected to the external RtCt timing network, where the timer threshold is 0.63 to 0.7 × VS (0.667 × VS typical) and the reset saturation voltage is 0.5 V maximum at 5 mA. |
| 6 | THRESH | input | Threshold input to the input comparator, which compares it against COMPIN (pin 7), with a common-mode range of −0.2 V to VCC − 2 V and offset voltage of ±10 mV maximum for LM331 (±14 mV over temperature). |
| 7 | COMPIN | input | Comparator input for the signal voltage VIN, which the input comparator compares against THRESH (pin 6), with a bias current of −300 nA maximum and an offset current of ±100 nA maximum. |
| 8 | VS | power_in | Supply voltage, specified over 4 V to 40 V with an absolute maximum of 40 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | PDIP-8 |
| Category | Data Acquisition |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
LM331AN - Footprint:
Package_DIP:DIP-8_W7.62mm - 3D model: PDIP-8 (KiCad packages3D, STEP)
- 3D model files:
lm331an-etched.step/lm331an-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm331an.step/lm331an.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (24 pp, sha256
a5847f55707c2947, retrieved 2026-10-08, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(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).