FOD817AW Equivalent & Substitute Parts

Part Overview

The FOD817AW is a 5000Vrms optoisolator with transistor output in a 4-DIP package manufactured by onsemi. This component provides galvanic isolation for low-speed digital signal transmission in industrial and consumer applications. The FOD817AW is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across isolation voltage, current transfer ratio, output characteristics, and thermal operating range.

Key Parameters

Parameter	Value
Isolation Voltage	5000Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	80% @ 5mA
Current Transfer Ratio (Max)	160% @ 5mA
Maximum Output Voltage	70V
Maximum Output Current	50mA per channel
Rise / Fall Time	4µs / 3µs
Operating Temperature Range	-55°C to 110°C
Package Type	4-DIP (0.400", 10.16mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the FOD817AW is determined by the following critical parameters:

Isolation Voltage: Must equal 5000Vrms
Package / Case: Must be 4-DIP (0.400", 10.16mm) for mechanical and electrical compatibility
Mounting Type: Must be Through Hole
Output Type: Must be Transistor
Number of Channels: Must be 1
Operating Temperature Range: Must encompass -55°C to 110°C
Input Type: Must be DC

The FOD817A300W (onsemi) and LTV-817M (Lite-On Inc.) meet these core substitution criteria. Both parts maintain the same isolation voltage, package configuration, and basic functional characteristics. Differences in current transfer ratio ranges and maximum output voltage do not preclude substitution when circuit design accounts for these parameter variations.

Parameter Comparison

Parameter	FOD817AW	FOD817A300W	LTV-817M
Manufacturer	onsemi	onsemi	Lite-On Inc.
Product Status	Obsolete	Active	Active
Number of Channels	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	80% @ 5mA	80% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	160% @ 5mA	160% @ 5mA	600% @ 5mA
Voltage - Output (Max)	70V	70V	35V
Current - Output / Channel	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	50mA	50mA	50mA
Vce Saturation (Max)	200mV	200mV	200mV
Rise / Fall Time (Typ)	4µs / 3µs	4µs / 3µs	4µs / 3µs
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)
Input Type	DC	DC	DC
Output Type	Transistor	Transistor	Transistor

Engineering Selection Recommendations

FOD817A300W (onsemi): This part is the direct onsemi equivalent with active product status. It maintains identical electrical specifications to the FOD817AW across all critical parameters including current transfer ratio range (80%-160% @ 5mA) and maximum output voltage (70V). The FOD817A300W is RoHS3 compliant and available in tube packaging. This part is the preferred substitute when maintaining exact electrical performance specifications is required.

LTV-817M (Lite-On Inc.): This part provides functional substitution with active product status and RoHS3 compliance. The LTV-817M differs in current transfer ratio range (50%-600% @ 5mA) and maximum output voltage (35V). The wider current transfer ratio range and lower maximum output voltage require circuit design verification. The LTV-817M is suitable for applications where the lower output voltage ceiling and broader CTR tolerance are acceptable.

Frequently Asked Questions (FAQ)

Q: Can FOD817A300W directly replace FOD817AW without circuit modification?

A: Yes. The FOD817A300W maintains identical electrical specifications across isolation voltage, current transfer ratio, output voltage, output current, and timing characteristics. Direct substitution is possible without circuit redesign.

Q: Is the LTV-817M a direct replacement for FOD817AW?

A: The LTV-817M is functionally compatible but not electrically identical. The maximum output voltage is 35V (versus 70V for FOD817AW) and the current transfer ratio range is wider (50%-600% versus 80%-160%). Circuit design must account for these differences. Applications requiring the full 70V output capability cannot use the LTV-817M without modification.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 4-DIP (0.400", 10.16mm) package with identical through-hole mounting. Pin configuration is compatible for direct PCB substitution.

Q: What is the difference between FOD817AW and FOD817A300W packaging?

A: FOD817AW packaging is not specified in available data. FOD817A300W is supplied in tube packaging. Both parts use the same 4-DIP package type.

Q: Which substitute part should be selected for new designs?

A: FOD817A300W is recommended for new designs due to active product status, identical electrical specifications, and RoHS3 compliance. LTV-817M is an alternative when the lower maximum output voltage and wider CTR tolerance are compatible with circuit requirements.

Q: Are there compliance or certification differences between the substitutes?

A: FOD817A300W is RoHS3 compliant. LTV-817M is RoHS3 compliant. Both parts are REACH unaffected and classified as EAR99. Moisture sensitivity differs: FOD817A300W is not applicable; LTV-817M is MSL 1 (Unlimited).

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