component
OC6781
Public Made by Adomby adom
OCX LED 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
markdownOC6781
OCX · LED Drivers · SOP-8
OC6781 from OCX, 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 | DRV | output | Gate drive output for the external power MOSFET, with an absolute maximum pin voltage of -0.3 to 8 V and rise and fall times of 50 ns each with a 500 pF load. |
| 2 | VDD | power_in | Chip supply input with an operating range of 5 to 40 V, an undervoltage lockout at 4.8 V on rising VDD, and an absolute maximum of 45 V. |
| 3 | EN | input | Chip enable input, active high, requiring at least 3.2 V for logic high and at most 0.8 V for logic low, with an absolute maximum of -0.3 to 45 V. |
| 4 | ROSC | input | Switching frequency setting pin, where a resistor to GND sets about 450 kHz, a floating pin gives 500 kHz, and the datasheet example uses ROSC = 330 kΩ for 120 kHz, with an absolute maximum of -0.3 to 6 V. |
| 5 | OVP | input | Output overvoltage detection input, where the OVP threshold is set by an external divider R1/R2 referenced to VREF = 1 V, with an absolute maximum of -0.3 to 6 V. |
| 6 | VFB | input | LED output current feedback input, which the loop regulates to about 250 mV (240 to 260 mV) through the feedback resistor RFB, with an absolute maximum of -0.3 to 6 V. |
| 7 | GND | power_in | Ground reference pin for the device. |
| 8 | VCS | input | Inductor current sense input used for cycle-by-cycle peak current limiting with a 250 mV threshold (240 to 260 mV), with an absolute maximum of -0.3 to 6 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | OCX |
| Package | SOP-8 |
| Category | Nixie Tube Driver/LED Driver |
| 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 端最大电压 (VDD max voltage) | VDD | 45 | V | 3 | |||
| EN 脚最大电压 (EN pin max voltage) | VEN | -0.3 | 45 | V | 3 | ||
| DRV 脚最大电压 (DRV pin max voltage) | VDRV | -0.3 | 8 | V | 3 | ||
| VFB、ROSC、OVP 和 VCS 脚电压 (VFB, ROSC, OVP and VCS pin voltage) | VMAX | -0.3 | 6 | V | 3 | ||
| SOP8 封装最大功耗 (SOP8 max power dissipation) | PSOP8 | 0.8 | W | 3 | |||
| 工作温度范围 (operating temperature range) | TA | -20 | 85 | °C | 3 | ||
| 存储温度范围 (storage temperature range) | TSTG | -40 | 120 | °C | 3 | ||
| 焊接温度范围 (soldering temperature) | TSD | 240 | °C | 时间小于30秒 (time less than 30 s) | 3 | ||
| 静电耐压值 (ESD voltage) | VESD | 2000 | V | 人体模型 (human body model) | 3 | ||
| 工作工作电压 (operating voltage) | VDD | 5 | 40 | V | 4 | ||
| VCS 过流保护阈值 (current-limit threshold) | VCS_TH | 240 | 250 | 260 | mV | 4 | |
| FB 脚电压 (FB pin voltage) | VFB | 240 | 250 | 260 | mV | 4 | |
| 欠压保护电压 (UVLO voltage) | VDD_UVLO | 4.8 | V | VDD上升 (VDD rising) | 4 | ||
| 工作电流 (operating current) | IOP | 2.5 | mA | FOP =200KHz | 4 | ||
| 待机输入电流 (standby input current) | IINQ | 75 | uA | 无负载，EN 为低电平 (no load, EN low) | 4 | ||
| 工作频率 (operating frequency) | FS | 120 | KHz | ROSC=330K | 4 | ||
| EN 端输入高电平 (EN high input level) | ENH | 3.2 | V | 4 | |||
| EN 端输入低电平 (EN low input level) | ENL | 0.8 | V | 4 | |||
| DRV 上升时间 (DRV rise time) | TRISE | 50 | ns | DRV 脚接 500pF 电容 (DRV pin with 500pF capacitor) | 4 | ||
| DRV 下降时间 (DRV fall time) | TFALL | 50 | ns | DRV 脚接 500pF 电容 (DRV pin with 500pF capacitor) | 4 | ||
| 过温保护阈值 (over-temperature protection threshold) | OTP_TH | 140 | °C | 4 | |||
| 最大占空比 (maximum duty cycle) | DMAX | 87 | % | VFB=0V | 4 |
CAD (KiCad official)
- Symbol:
OC6781 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
oc6781-etched.step/oc6781-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);oc6781.step/oc6781.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: OCX datasheet (7 pp, sha256
f13a2a530b995b53, 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).