component

LM331N

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by Ray

HGSEMI Analog To Digital Converters (ADC), DIP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Datasheet

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Contents

README

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LM331N

HGSEMI · Analog To Digital Converters (ADC) · DIP-8

LM331N from HGSEMI, in a DIP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 IOUT output Current output. Switched precision current source output (nominally i = 1.90V/RS, ~135 uA with RS=14 kOhm) that delivers a fixed charge Q = i*t into the load capacitor CL each timing cycle.
2 IREF output Reference current / bandgap reference pin. Held at 1.90 VDC by the internal current pump; an external resistor RS from pin 2 to ground sets the reference current i = 1.90V/RS (typ. 10 uA to 500 uA operating range).
3 FOUT output Frequency output. Open-collector logic output (VSAT ~0.15 V at 5 mA); requires an external pull-up (e.g. 10 kOhm to VLOGIC). Capable of driving up to 3 TTL loads or a high-voltage output up to 40V; short-circuit-proof against VCC.
4 GND power_in Device ground. All voltages are referenced to GND = 0V.
5 R/C passive Timing RC network pin. External Rt (to VS) and Ct (to GND) set the one-shot period t = 1.1RtCt. Internal timer comparator trips at 2/3 VCC (threshold 0.63-0.70 x VS), then an internal reset transistor discharges Ct (VSAT ~0.22 V at 5 mA).
6 THRESHOLD input Input comparator inverting input (threshold). Compared to the input at pin 7 by the input comparator. Bias current ~-80 nA typ; common-mode range -0.2V to VCC-2V.
7 VIN input Comparator input (non-inverting input of the input comparator). Applied signal voltage V1; when V1 > Vx at pin 6 the one-shot timer is triggered. Bias current ~-80 nA typ; common-mode range -0.2V to VCC-2V.
8 VS power_in Positive supply voltage (VS / VCC). Operating range +4V to +40V; absolute max 40V. Typical supply current 1.5-4.0 mA at VS=5V (LM331).

Key specifications

Parameter Value
Manufacturer HGSEMI
Package DIP-8
Category Data Acquisition
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • LM331N
  • LM331AN
  • LM331M/TR
  • LM331AM/TR

CAD (KiCad official)

  • Symbol: LM331N
  • Footprint: Package_DIP:DIP-8_W7.62mm
  • 3D model: DIP-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: HGSEMI datasheet (21 pp, sha256 cbb85fee4a95c1f7, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF