component
COS3121SR
Public Made by Adomby adom
COSINE Gate Drivers, 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
markdownCOS3121SR
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cos3121sr.step/cos3121sr.glbare 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, 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).