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COS3121SR

Public Made by Adom

by adom

COSINE Gate Drivers, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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COS3121SR

COSINE · Gate Drivers · SOP-8

COS3121SR from COSINE, 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 VDD power_in Bias supply for the MOSFET driver, rated 4.5 V to 18 V with respect to GND, and should be bypassed with local ceramic capacitors (1.0 µF suggested); absolute maximum DC supply is 25 V.
2 INPUT input High-impedance TTL/CMOS-compatible control input with 300 mV hysteresis, and the absolute maximum input voltage is GND-5 V to VDD+0.3 V.
3 EN input TTL/CMOS-compatible enable input that must be pulled LOW to inhibit the driver, with the output LOW regardless of the input when disabled and an internal 100 kΩ pull-up to VDD for active-high operation.
4 GND power_in Device return pin that should have a low-impedance connection to the bias supply return, and which carries high peak current when the capacitive load is discharged; the part tolerates up to 5 V of noise spiking of either polarity on the ground pin.
5 GND power_in Ground duplicate of pin 4 that must be connected together with pin 4 for proper operation, carrying the same return and high peak discharge current.
6 OUTPUT output CMOS push-pull driver output with equal pull-up and pull-down strength, held LOW if the input is unbiased or floating, with a 9.0 A peak output current rating for 10 V ≤ VDD ≤ 18 V.
7 OUTPUT output Output duplicate of pin 6 that must be connected together with pin 6 for proper operation, with the same CMOS push-pull characteristics.
8 VDD power_in Duplicate of pin 1 bias supply input that must be connected together with pin 1, rated 4.5 V to 18 V with respect to GND.

Key specifications

Parameter Value
Manufacturer COSINE
Package SOP-8
Category Motor Driver ICs
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
DC Supply Voltage 4.5 18 V 4
Operating ambient temperature -40 125 °C 4
DC supply voltage VDD VDD 25 V 4
Operating junction temperature -40 125 °C 4
Storage temperature -55 150 °C 4
Package Thermal Resistance, junction-to-ambient (SOP8) RθJA 155 °C/W SOP8 package, junction-to-ambient 4
Input Signal High Current, inverting input IIL 88 125 µA Inverting Input Current, VINX=0V 5
Input Signal High Current, non-inverting input IIH 88 125 µA Non-inverting Input Current, VINX=18V 5
Operating Voltage Range VDD 4.5 18 V 5
Under-Voltage Lockout ON Threshold 3.7 4.1 V 5

CAD (KiCad official)

  • Symbol: COS3121SR
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: cos3121sr-etched.step / cos3121sr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cos3121sr.step / cos3121sr.glb are the bare package body.

Provenance

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

  • Datasheet: COSINE datasheet (8 pp, sha256 128b6dd1d63b734a, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF