component
LM331P
Public Made by Adomby adom
Sungine V/F And F/V Converters, SOP-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
markdownLM331P
Sungine · V/F And F/V Converters · SOP-8
LM331P from Sungine, in a SOP-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 | CURO | output | Current output (switched current source output, flows to pin 1 or GND depending on RS flip-flop state; current range 10 to 500 µA). |
| 2 | REFCUR | output | Reference current pin held at 1.9V (1.70 to 2.08V) by the charge pump, setting i = 1.9V/Rs (135 µA at Rs = 14k); do not draw current from it. |
| 3 | FOUT | output | Frequency output driver transistor with about 50 ohm saturation resistance, output current limited below 50 mA and tolerates up to 40V. |
| 4 | GND | power_in | Ground. |
| 5 | R/C | input | Timing comparator input for external Rt/Ct, threshold 2/3 of VS (0.667 typ) that resets the RS flip-flop. |
| 6 | THD | input | Input comparator inverting input; comparator triggers timer when pin 7 voltage is higher than pin 6. |
| 7 | COM I | input | Input comparator non-inverting input with bias current of -80 nA typ, common-mode range -0.2V to VCC-2.0V. |
| 8 | VS | power_in | Power supply, 4.0V to 40V operating (absolute maximum 40V). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Sungine |
| Package | SOP-8 |
| Category | Data Acquisition |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VFC nonlinearity | -0.01 | 0.003 | 0.01 | % full scale | 4.5V≤VS≤20V | 4 | |
| VFC nonlinearity over temperature | -0.02 | 0.006 | 0.02 | % full scale | TMIN≤TA≤TMAX | 4 | |
| VFC nonlinearity (Fig 3) | -0.14 | 0.024 | 0.14 | % full scale | VS=15V, f=10~11kHz | 4 | |
| Conversion accuracy scale factor | 0.9 | 1 | 1.1 | kHz/V | VIN=-10V, RS=14kΩ | 4 | |
| Gain temperature stability LM331 | -150 | 30 | 150 | ppm/℃ | TMIN≤TA≤TMAX, 4.5V≤VS≤20V | 4 | |
| Gain change with VS (4.5V-10V) | 0.01 | 0.1 | %/V | 4.5V≤VS≤10V | 4 | ||
| Gain change with VS (10V-40V) | 0.006 | 0.06 | %/V | 10V≤VS≤40V | 4 | ||
| Rated full-scale frequency | 10 | kHz | VIN=-10V | 4 | |||
| Long-term gain stability (1000 h) | 0.02 | % full scale | TMIN≤TA≤TMAX | 4 | |||
| Overrange frequency | 10 | % | VIN=-11V | 4 | |||
| Input comparator offset voltage LM331 | -14 | 4 | 14 | mV | TMIN≤TA≤TMAX | 4 | |
| Input comparator bias current | -80 | -300 | nA | 4 | |||
| Input comparator offset current | -100 | 8 | 100 | nA | 4 | ||
| Input comparator common-mode range | -0.2 | V | TMIN≤TA≤TMAX; max VCC-2.0 | 4 | |||
| Timer threshold voltage (pin 5) | 0.63 | 0.667 | 0.7 | *VS | 4 | ||
| Timer input bias current (pin 5), all drive | -100 | 10 | 100 | nA | VS=15V, 0V≤Vpin5≤9.9V, all drive | 4 | |
| Timer input bias current (pin 5) LM1/2/331 | 200 | 1000 | nA | Vpin5=10V, LM1/2/331 | 4 | ||
| VSAT (pin 5 reset) | VSAT | 0.22 | 0.5 | V | I=5mA | 4 | |
| Current source output current (pin 1) | 116 | 136 | 156 | µA | RS=14kΩ, VPIN1=0 | 5 | |
| Change in output current with voltage | 0.2 | 1 | µA | 0V≤VPIN1≤10V | 5 | ||
| Current source off leakage | 0.02 | 10 | nA | 5 | |||
| Current source off leakage at TMAX | 2 | 50 | nA | TA=TMAX, all drive | 5 | ||
| Operating current range | 10 | 500 | µA | 5 | |||
| Reference voltage (pin 2) | 1.7 | 1.89 | 2.08 | VDC | 5 | ||
| Reference voltage temperature stability | 60 | ppm/℃ | 5 | ||||
| Reference voltage time stability (1000 h) | 0.1 | % | 1000 hours | 5 | |||
| Logic output VSAT (pin 3) | VSAT | 0.15 | 0.5 | V | I=5mA | 5 | |
| Logic output VSAT, 2 TTL loads | VSAT | 0.1 | 0.4 | V | I=3.2mA (2 TTL loads), TMIN≤TA≤TMAX | 5 | |
| Logic output off leakage | -1 | 0.05 | 1 | µA | 5 | ||
| Supply current | 1.5 | 3 | 6 | mA | VS=5V | 5 | |
| Supply current | 2 | 4 | 8 | mA | VS=40V | 5 | |
| Supply voltage | VS | 40 | V | 3 | |||
| Input voltage | -0.2 | V | max Vs | 3 | |||
| Operating temperature range LM331 | 0 | 70 | ℃ | LM331 | 3 | ||
| Power dissipation | 1.25 | W | 25℃ | 3 | |||
| Soldering temperature | 260 | ℃ | spot soldering, 10 seconds | 3 | |||
| Operating supply voltage | VS | 4 | 40 | V | conditions for tables 1 and 2 | 5 |
CAD (KiCad official)
- Symbol:
LM331P - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
lm331p-etched.step/lm331p-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm331p.step/lm331p.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Sungine datasheet (12 pp, sha256
20bc1d95008650ea, retrieved 2026-10-23, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).