The **6N137-000E** is a high-speed, single-channel optocoupler (also known as an optoisolator) designed for digital logic interface applications. It is manufactured by Broadcom (formerly Avago/Agilent). --- ### ## Technical Overview The device consists of an **AlGaAs LED** and an integrated **high-gain photodetector**. It is specifically designed for high-speed applications, supporting data rates up to **10 MBd (Megabaud)**. ### ### Key Components 1. **Input Side:** An Infrared LED that converts electrical signals into light. 2. **Output Side:** A photodetector with an open-collector Schottky-clamped transistor and an internal Faraday shield to provide high common-mode rejection (CMR). --- ### ## Specifications Table | Parameter | Specification | | :--- | :--- | | **Data Rate** | 10 MBd (Typical) | | **Supply Voltage ($V_{CC}$)** | 4.5V to 5.5V | | **Isolation Voltage** | 3750 Vrms | | **Common Mode Rejection (CMR)** | 10 kV/µs (Typical) | | **Output Type** | Open Collector | | **Input Forward Current ($I_F$)** | 5mA (Recommended) | | **Package Style** | 8-Pin DIP (Through-hole) | --- ### ## Pin Configuration The 6N137 uses a standard 8-pin layout: | Pin | Function | Description | | :--- | :--- | :--- | | 1 | NC | No Connection | | 2 | Anode | LED Anode (Positive input) | | 3 | Cathode | LED Cathode (Negative input) | | 4 | NC | No Connection | | 5 | GND | Ground (Output side) | | 6 | $V_{O}$ | Output (Open Collector) | | 7 | $V_{E}$ | Enable Pin (Active High) | | 8 | $V_{CC}$ | Supply Voltage (Output side) | --- ### ## Key Features and Considerations * **Logic Compatibility:** The output is compatible with TTL, LSTTL, and CMOS logic gates. * **Enable Pin:** Pin 7 allows the output to be gated. When the enable pin is HIGH, the output reflects the input state; when LOW, the output is forced HIGH regardless of the input. * **Internal Shielding:** The internal Faraday shield provides high immunity to electrical noise (transients), making it ideal for noisy industrial environments. * **Open Collector:** Since it has an open-collector output, a **pull-up resistor** is required on Pin 6 to interface with logic circuits. --- ### ## Typical Applications * **Microprocessor System Interfaces:** Isolating CPUs from high-voltage peripherals. * **Digital Isolation for A/D and D/A Converters:** Reducing noise interference. * **RS-232 / RS-422 / RS-485:** High-speed data communication lines. * **Switching Power Supplies:** Providing feedback isolation.