6N137
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onsemi high-speed logic-gate optocoupler, DIP-8. 10 Mbit/s, open-collector output with enable. Datasheet-verified.
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markdown6N137
onsemi · High-speed logic optocoupler · PDIP-8
A high-speed optocoupler for isolating digital signals, in DIP-8. An input LED (anode/cathode) drives an internal photodiode and a logic-gate output stage, giving a clean open-collector logic output that keeps up to 10 Mbit/s, far faster than a phototransistor optocoupler like the PC817. An output enable pin (VE) gates the output and lets several share a bus. It is the standard way to cross an isolation barrier for a UART, SPI clock, encoder signal, or gate-drive command while blocking high voltage and breaking ground loops. Needs a pull-up on the open-collector output. Pin 4 is not connected.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | NC | unconnected | No internal connection. Leave floating or tie to ground per PCB layout preference. |
| 2 | ANODE | input | Anode of the input AlGaAs LED. Typical forward current IF = 5 mA (max 15 mA), VF ~1.4-1.75 V. Drive with a current-limiting resistor from the logic source. |
| 3 | CATHODE | input | Cathode of the input AlGaAs LED. Return path for the LED forward current; typically driven low by the source logic gate through a series resistor. |
| 5 | GND | power_in | Output-side ground reference. Must be well-decoupled to VCC (pin 8) with a 0.1 uF ceramic capacitor placed close to the device. |
| 6 | VO | output | Open-collector Schottky-clamped output. Requires an external pull-up resistor (typ. 350 Ω to VCC). Sinks up to 13 mA in the low state; propagation delay ~48 ns (10 MBd data rate). |
| 7 | VE | input | Enable input. When held high (or left open with internal pull-up considerations), the output responds to LED current. When pulled low, the output is disabled (held high). Tie to VCC if not used. |
| 8 | VCC | power_in | Output-side supply voltage, 4.5 V to 5.5 V (absolute max 7 V). Bypass to GND (pin 5) with a 0.1 uF ceramic capacitor placed close to the device. |
Key specifications
| Parameter | Value |
|---|---|
| Type | High-speed logic optocoupler |
| Data rate | 10 Mbit/s |
| Input | LED (anode/cathode) |
| Output | open-collector logic (needs pull-up) |
| Enable | VE output-enable pin |
| Isolation | ~3750 Vrms |
| CTR/coupling | logic-level (not linear) |
| Package | PDIP-8 (pin 4 = NC) |
Ordering variants
6N137 (PDIP-8)6N137S (SOIC-8, gull-wing)
CAD (KiCad official)
- Symbol:
Isolator:6N137 - Footprint:
Package_DIP:DIP-8_W7.62mm - 3D model: DIP-8 (KiCad packages3D)
- 3D model files:
6n137-etched.step/6n137-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);6n137.step/6n137.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (12 pp, sha256
4926d748b1db9af4, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).