component
KP421SPA
Public Made by Adomby adom
Kiwi Instruments Supervisor And Reset ICs, 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
markdownKP421SPA
Kiwi Instruments · Supervisor And Reset ICs · SOP-8
KP421SPA from Kiwi Instruments, 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 | DET | input | MOSFET drain-voltage detection pin; the DET clamp voltage is 2 V, and the LED short-circuit protection thresholds are 36-44 uA (trigger) and 70-100 uA (recovery). |
| 2 | NC | unconnected | No connection; leave floating in use. |
| 3 | GATE | output | NMOSFET gate drive output; the gate maximum voltage is 8-12 V (typical 10 V). |
| 4 | CS | input | LED current-sense input; the current limit is 190-200 mV and the open-circuit detection threshold is 5-15 mV. |
| 5 | GND | power_in | Chip reference ground. |
| 6 | COMP | input | Ripple-cancellation loop compensation pin; when left floating, the compensation is fixed internally (3 uF capacitor), and with an external capacitor the COMP clamp voltage is 1.8-2.2 V. |
| 7 | NC | unconnected | No connection; leave floating in use. |
| 8 | VDD | power_in | Chip supply pin; start-up voltage is 13.5-17 V, undervoltage lockout threshold is 8.5-10.5 V, and the VDD breakdown voltage is 650 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Kiwi Instruments |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| VDD input start voltage | VDDON | 13.5 | 16 | 17 | V | 3 | |
| VDD undervoltage protection threshold | VDDOFF | 8.5 | 9.5 | 10.5 | V | 3 | |
| VDD start current | IVDDST | 100 | 200 | 300 | uA | VDD<VDD_ON | 3 |
| VDD operating current | IVDDOp | 100 | 200 | 300 | uA | 3 | |
| Current limit (CS voltage) | VCS_MAX | 190 | 195 | 200 | mV | 3 | |
| Open-circuit detection threshold | VCS_MIN_L | 5 | 10 | 15 | mV | 3 | |
| Open-circuit detection threshold hysteresis | VCS_MIN_H | 25 | 30 | 35 | mV | 3 | |
| GATE maximum voltage | VGATE_MAX | 8 | 10 | 12 | V | 4 | |
| LED short-circuit protection recovery threshold | IDETH | 70 | 80 | 100 | uA | 4 | |
| LED short-circuit protection threshold | IDETL | 36 | 40 | 44 | uA | 4 | |
| DET clamp voltage | VDETClamp | 2 | V | 4 | |||
| Short-circuit protection delay | TDET1 | 0.4 | ms | 4 | |||
| Short-circuit protection restart time | TDET2 | 500 | ms | 4 | |||
| COMP clamp voltage | COMPmax | 1.8 | 2 | 2.2 | V | COMP 脚接电容 | 4 |
| Over-temperature protection trip point | TOTP | 135 | °C | 4 | |||
| VDD breakdown voltage | 650 | V | 3 | ||||
| CS, DET pin voltage | -0.3 | 8 | V | 3 | |||
| Power dissipation (SOP-8) | PDmax | 0.6 | W | TA=50°C, note 2 | 3 | ||
| Chip operating junction temperature (absolute maximum) | 150 | °C | 3 | ||||
| Storage temperature | -65 | 150 | °C | 3 | |||
| Pin temperature (soldering, 10 s) | 260 | °C | 焊接 10 秒 | 3 | |||
| ESD capability (human body model) | 3000 | V | 人体模型 | 3 | |||
| Recommended operating junction temperature | -40 | 125 | °C | 3 | |||
| Thermal resistance junction-to-ambient (SOP-8) | θJA | 165 | oC/W | 3 |
CAD (KiCad official)
- Symbol:
KP421SPA - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
kp421spa-etched.step/kp421spa-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);kp421spa.step/kp421spa.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Kiwi Instruments datasheet (7 pp, sha256
347cd2cd26fc92f5, retrieved 2026-10-18, 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-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).