FOD617C Optoisolator 5KV Transistor 4-DIP Equivalent & Substitute Parts

Part Overview

The FOD617C is a single-channel optoisolator with transistor output, rated for 5000Vrms isolation voltage in a 4-DIP through-hole package. This component is classified as Last Time Buy, indicating discontinued production. Equivalent and substitute parts are necessary to ensure design continuity and maintain supply chain reliability for applications requiring galvanic isolation in DC input circuits with transistor output stages.

Key Parameters

Parameter	FOD617C Value
Isolation Voltage	5000Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	100% @ 10mA
Current Transfer Ratio (Max)	200% @ 10mA
Maximum Output Voltage	70V
Maximum Output Current	50mA
Vce Saturation (Max)	400mV
Operating Temperature Range	-55°C to 110°C
Package Type	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the FOD617C is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms (equal or higher acceptable)
Package Type: 4-DIP (0.300", 7.62mm) form factor required for mechanical compatibility
Output Type: Transistor output configuration
Number of Channels: Single channel
Input Type: DC input
Mounting Type: Through hole
Operating Temperature Range: Must encompass or exceed -55°C to 110°C
Compliance: ROHS3 and REACH requirements

Current Transfer Ratio, output voltage/current ratings, and switching characteristics may vary within acceptable ranges for equivalent operation. Parts meeting all critical parameters are classified as direct substitutes.

Parameter Comparison

Parameter	FOD617C (onsemi)	FOD817C (onsemi)	SFH615A-3 (Vishay)	SFH617A-1X001 (Vishay)	SFH617A-2X001 (Vishay)	SFH617A-3X001 (Vishay)	SFH617A-4X001 (Vishay)	VO615A-3 (Vishay)
Isolation Voltage	5000Vrms	5000Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5000Vrms
Number of Channels	1	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	100% @ 10mA	200% @ 5mA	100% @ 10mA	40% @ 10mA	63% @ 10mA	100% @ 10mA	160% @ 10mA	100% @ 10mA
Current Transfer Ratio (Max)	200% @ 10mA	400% @ 5mA	200% @ 10mA	80% @ 10mA	125% @ 10mA	200% @ 10mA	320% @ 10mA	200% @ 10mA
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	2µs, 2µs	2µs, 2µs	2µs, 2µs	2µs, 2µs	2µs, 2µs	3µs, 4.7µs
Maximum Output Voltage	70V	70V	70V	70V	70V	70V	70V	70V
Maximum Output Current	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	400mV	200mV	400mV	400mV	400mV	400mV	400mV	300mV
Operating Temperature Range	-55°C to 110°C	-55°C to 110°C	-55°C to 100°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C
Package Type	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

FOD817C (onsemi) is the manufacturer-recommended upgrade path. It maintains identical isolation voltage, package, and operating temperature range while offering improved current transfer ratio performance (200–400% @ 5mA) and reduced Vce saturation (200mV vs. 400mV). Product status is Active with higher inventory availability.

Vishay SFH617A Series (SFH617A-1X001, SFH617A-2X001, SFH617A-3X001, SFH617A-4X001) provides direct mechanical and electrical compatibility with enhanced isolation voltage (5300Vrms) and faster switching characteristics (2µs rise/fall time). Selection within this series depends on required current transfer ratio:

SFH617A-1X001: 40–80% CTR
SFH617A-2X001: 63–125% CTR
SFH617A-3X001: 100–200% CTR (closest match to FOD617C)
SFH617A-4X001: 160–320% CTR

SFH615A-3 (Vishay) and VO615A-3 (Vishay) are functionally equivalent with matching isolation voltage and current transfer ratio specifications. SFH615A-3 offers faster switching (2µs rise/fall). VO615A-3 provides intermediate switching performance (3µs, 4.7µs) with lower Vce saturation (300mV).

All substitute parts are ROHS3 compliant and REACH unaffected. Selection should account for specific current transfer ratio requirements and switching speed constraints of the application circuit.

Frequently Asked Questions (FAQ)

Q: Can FOD817C directly replace FOD617C in existing designs? A: Yes. FOD817C maintains identical isolation voltage (5000Vrms), package (4-DIP), and operating temperature range (-55°C to 110°C). The improved current transfer ratio and reduced saturation voltage represent performance enhancements. Circuit validation is recommended for applications with tight timing or current requirements.

Q: What is the difference between Vishay SFH617A variants? A: The SFH617A series variants differ only in current transfer ratio (CTR) specification. The suffix number indicates CTR grade: -1X001 (40–80%), -2X001 (63–125%), -3X001 (100–200%), -4X001 (160–320%). All other electrical and mechanical parameters are identical. Select the variant matching your circuit's required CTR range.

Q: Are Vishay parts pin-compatible with onsemi FOD617C? A: Yes. All substitute parts use identical 4-DIP (0.300", 7.62mm) through-hole packaging with standard optoisolator pinout. Direct socket substitution is possible without PCB modification.

Q: Does the higher isolation voltage of SFH617A (5300Vrms) affect circuit operation? A: No. Higher isolation voltage is a superset specification. Applications designed for 5000Vrms isolation operate safely with 5300Vrms-rated components. This provides additional safety margin.

Q: Which substitute offers the fastest switching performance? A: Vishay SFH617A series and SFH615A-3 offer the fastest switching characteristics (2µs rise/fall time) compared to FOD617C (4µs, 3µs). VO615A-3 provides intermediate performance (3µs, 4.7µs).

Q: Is temperature range a limiting factor for substitution? A: SFH615A-3 operates to 100°C maximum, which is 10°C below FOD617C specification. For applications requiring full -55°C to 110°C range, use FOD817C, SFH617A variants, or VO615A-3.

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