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EL827 Dual-Channel Optocoupler — DIP-8, PC827 / LTV-827 Compatible, CTR 50–300% (5-Pack)
EL827 Dual-Channel Optocoupler DIP-8, PC827 / LTV-827 Compatible, CTR 50–300% (5-Pack)
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EL827 Dual-Channel Optocoupler — DIP-8, PC827 / LTV-827 Compatible, CTR 50–300% (5-Pack)
The EL827 is a dual-channel phototransistor optocoupler in a DIP-8 package, containing two independent optocoupler channels (each with an infrared LED and NPN phototransistor). It is a direct pin-compatible replacement for PC827, LTV-827, and EL827 series dual optocouplers. With CTR (current transfer ratio) of 50–300%, 5000V RMS isolation voltage, and 80kHz bandwidth, it is widely used in SMPS feedback circuits, dual-channel signal isolation, and industrial control interfaces.
Key Specifications
| Parameter | Value |
|---|---|
| Package | DIP-8 (through-hole) |
| Channels | 2 (dual, independent) |
| Output Type | NPN phototransistor |
| CTR (Current Transfer Ratio) | 50–300% (at IF=5mA, VCE=5V) |
| Isolation Voltage | 5000V RMS |
| Bandwidth | 80kHz |
| Max Collector-Emitter Voltage | 35V |
| Max Forward Current (LED) | 50mA |
| Operating Temperature | -30°C to +100°C |
| Quantity | 5 pieces |
EL827 vs PC817 vs PC827
| Feature | EL827 / PC827 | PC817 | 4N35 |
|---|---|---|---|
| Channels | 2 (dual) | 1 (single) | 1 (single) |
| Package | DIP-8 | DIP-4 | DIP-6 |
| CTR | 50–300% | 50–300% | 100–200% |
| Isolation | 5000V RMS | 5000V RMS | 7500V peak |
| Best for | Dual-channel isolation, SMPS dual feedback | Single-channel SMPS feedback | General isolation |
Why Choose EL827?
- Dual channel in DIP-8 — two independent optocoupler channels in one IC, saving PCB space
- PC827 / LTV-827 compatible — direct pin-compatible replacement for common dual optocouplers
- 5000V RMS isolation — high isolation for mains-connected and industrial circuits
- CTR 50–300% — wide CTR range for flexible circuit design
- 5-pack value — sufficient for multiple SMPS and isolation circuit builds
Compatible With / Common Use Cases
- SMPS dual feedback: Two independent feedback channels in flyback or forward converter using one EL827
- Dual signal isolation: Isolate two independent 5V signals from 24V industrial I/O in one DIP-8 package
- PC827 replacement: Direct drop-in replacement for failed PC827 or LTV-827 in SMPS and industrial equipment
- Relay driver isolation: Two isolated relay drive channels from MCU GPIO
- Dual UART isolation: Isolate TX and RX lines of a UART interface with one EL827
Frequently Asked Questions
Q: Is EL827 a direct replacement for PC827 and LTV-827?
A: Yes — EL827, PC827, and LTV-827 are pin-compatible dual optocouplers in DIP-8 with identical electrical specifications (CTR 50–300%, 5000V isolation, 35V VCEO). EL827 is a direct drop-in replacement for both. Verify the CTR grade suffix (A, B, C) if the original circuit requires a specific CTR range.
Q: How do I calculate the LED current limiting resistor for EL827?
A: For IF=5mA from a 5V supply: R = (VCC − VLED) / IF = (5 − 1.2) / 0.005 = 760Ω. Use 820Ω standard value. For 3.3V supply: R = (3.3 − 1.2) / 0.005 = 420Ω, use 470Ω. At IF=5mA and CTR=100%, collector current IC = 5mA × 1.0 = 5mA — sufficient to drive a relay coil or logic input.
Q: What is the pinout of EL827 in DIP-8?
A: EL827 DIP-8 pinout: Pin 1 = Anode (CH1 LED), Pin 2 = Cathode (CH1 LED), Pin 3 = Anode (CH2 LED), Pin 4 = Cathode (CH2 LED), Pin 5 = Emitter (CH2 transistor), Pin 6 = Collector (CH2 transistor), Pin 7 = Emitter (CH1 transistor), Pin 8 = Collector (CH1 transistor). Verify with the EL827 datasheet before soldering.
Package Contents
- 5× EL827 Dual-Channel Optocoupler IC (DIP-8)
