Skip to main content

We use cookies to understand how you use our site and improve your experience. See our Privacy Policy.

FOD817

Phototransistor Optocoupler

The FOD817 is a phototransistor optocoupler from onsemi. View the full FOD817 datasheet below including key specifications, absolute maximum ratings.

Official FOD817 datasheet (PDF) — the source this page was extracted from.

Manufacturer

onsemi

Category

Optocouplers

Package

DIP-4

FOD817 Key Specifications

ParameterValue
Current - DC Forward (If) (Max)50 mA
Current - Output / Channel50mA
Current Transfer Ratio (Max)160% @ 5mA
Current Transfer Ratio (Min)80% @ 5mA
Input TypeDC
Mounting TypeSurface Mount
Number of Channels1
Operating Temperature-55°C ~ 110°C
Output TypeTransistor
Package / Case4-SMD, Gull Wing
PackagingTube
Rise / Fall Time (Typ)4µs, 3µs
Standard Pack Qty2000
Supplier Device Package4-SMD
Vce Saturation (Max)200mV
Forward Voltage (Vf)1.2V
Voltage - Isolation5000Vrms
Output Voltage (Max)70V

FOD817 Overview

Part: FOD814 Series, FOD817 Series — Fairchild Semiconductor

Type: Phototransistor Optocoupler

Description: The FOD814 series consists of two inverse-parallel gallium arsenide infrared emitting diodes driving a silicon phototransistor, while the FOD817 series uses a single gallium arsenide infrared emitting diode driving a silicon phototransistor, both in a 4-pin dual in-line package with 5000Vrms isolation and high operating temperatures.

Operating Conditions:

  • Operating temperature: -55 to +110 °C (FOD817), -55 to +105 °C (FOD814)
  • Lead Solder Temperature: 260 °C for 10 sec
  • Junction Temperature: 125 °C Max.

Absolute Maximum Ratings:

  • Max continuous forward current (emitter): ±50 mA (FOD814), 50 mA (FOD817)
  • Max collector-emitter voltage: 70 V
  • Max continuous collector current: 50 mA
  • Max total power dissipation: 200 mW
  • Max junction temperature: 125 °C
  • Max storage temperature: -55 to +150 °C

Key Specs:

  • Input-Output Isolation Voltage: 5000 Vac(rms) (f = 60Hz, t = 1 min)
  • Collector-Emitter Breakdown Voltage: 70 V (I C = 0.1mA, I F = 0)
  • Forward Voltage (emitter): 1.2 V (Typ.) at I F = ±20mA (FOD814), 20mA (FOD817)
  • Collector Dark Current: 100 nA (Max.) at V CE = 20V, I F = 0
  • Current Transfer Ratio (FOD814): 20–300% (I F = ±1mA, V CE = 5V)
  • Current Transfer Ratio (FOD817): 50–600% (I F = 5mA, V CE = 5V)
  • Cut-Off Frequency (FOD814): 15 kHz (Min.) at V CE = 5V, I C = 2mA, R L = 100 Ω
  • Response Time (Rise/Fall): 4 μs (Typ. rise), 3 μs (Typ. fall) at V CE = 2 V, I C = 2mA, R L = 100 Ω

Features:

  • AC input response (FOD814 only)
  • Applicable to Pb-free IR reflow soldering
  • Compact 4-pin package
  • C-UL, UL and VDE approved
  • High input-output isolation voltage of 5000Vrms
  • Minimum BV CEO of 70V guaranteed
  • Higher operating temperatures (versus H11AXXX counterparts)

Applications:

  • AC line monitor (FOD814 Series)
  • Unknown polarity DC sensor (FOD814 Series)
  • Telephone line interface (FOD814 Series)
  • Power supply regulators (FOD817 Series)
  • Digital logic inputs (FOD817 Series)
  • Microprocessor inputs (FOD817 Series)

Package:

  • 4-pin dual in-line package

FOD817 Features

  • ■ AC input response (FOD814 only)

  • ■ Applicable to Pb-free IR reflow soldering

  • ■ Compact 4-pin package

  • ■ C-UL, UL and VDE approved

  • ■ High input-output isolation voltage of 5000Vrms

  • ■ Minimum BV CEO of 70V guaranteed

  • ■ Higher operating temperatures (versus H11AXXX counterparts)

  • ■ Current transfer ratio in selected groups:

FOD814: 20-300%

FOD817: 50-600%

FOD814A: 50-150%

FOD817A: 80-160%

FOD817B: 130-260%

FOD817C: 200-400%

FOD817D: 300-600%

FOD817 Applications

FOD814 Series

  • ■ AC line monitor
  • ■ Unknown polarity DC sensor
  • ■ Telephone line interface

FOD817 Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only.

ValueValueUnits
SymbolParameterFOD814FOD817
TOTAL DEVICETOTAL DEVICE
T STGStorage Temperature-55 to +150-55 to +150°C
T OPROperating Temperature-55 to +105-55 to +110°C
T SOLLead Solder Temperature260 for 10 sec260 for 10 sec°C
T JJunction Temperature125 Max.125 Max.°C
θ JCJunction-to-Case Thermal Resistance210210°C/W
P TOTTotal Power Dissipation200200mW
EMITTEREMITTER
I FContinuous Forward Current±5050mA
V RReverse Voltage6
P DPower Dissipation Derate above 100°C70 1.770 1.7mW mW/°C
DETECTORDETECTOR
V CEOCollector-Emitter Voltage7070V
V ECOEmitter-Collector Voltage66V
I CContinuous Collector Current5050mA
P CCollector Power Dissipation Derate above 90°C150 2.9150 2.9mW mW/°C

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part NumberManufacturerPackage
FOD814onsemi—
FOD814Aonsemi—
FOD817AonsemiDIP-4
FOD817ASonsemi4-SMD, Gull Wing
FOD817Bonsemi—
FOD817Consemi4-pin Dual In-line Package
FOD817DonsemiDIP-4

Other Optocouplers

  • EL357N – Everlight, Phototransistor Photocoupler
  • EL357N-G-TA – Everlight, Phototransistor Optocoupler
  • EL357NA – Everlight, Phototransistor Photocoupler
  • EL357NB – Everlight, Phototransistor Photocoupler
  • EL357NC – Everlight, Phototransistor Photocoupler
  • EL357ND – Everlight, Phototransistor Photocoupler
  • EL357NE – Everlight, Phototransistor Photocoupler
  • EL357NF – Everlight, Phototransistor Photocoupler

All Optocouplers datasheetsAll onsemi datasheets (357)

Data on this page is extracted from publicly available manufacturer datasheets using automated tools including AI. It may contain errors or omissions. Always verify specifications against the official manufacturer datasheet before making design or purchasing decisions. See our Terms of Service. Rights holders can submit a takedown request.

Ask your AI agent about the FOD817

Connect SheetsData to Claude, Cursor, Codex or any MCP client and your agent reads this datasheet for you: pinout, limits, register maps and design checks, with the numbers taken from the PDF.

claude mcp add --transport http sheetsdata https://mcp.sheetsdata.com/mcp

Then ask: "Can the FOD817 run from my 12 V rail? Check it against the datasheet limits."

Create a free account $2 of usage every month, no card needed.