FOD617D Optoisolator Equivalent & Substitute Parts

Part Overview

The FOD617D is a 5000Vrms optoisolator with transistor output in 4-DIP package manufactured by onsemi. This component provides galvanic isolation for single-channel DC input applications with 50mA output capability. The FOD617D is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain compatibility across isolation voltage, output characteristics, package form factor, and thermal operating range.

Key Parameters

Parameter	FOD617D Value
Isolation Voltage	5000Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	160% @ 10mA
Current Transfer Ratio (Max)	320% @ 10mA
Maximum Output Voltage	70V
Maximum Output Current	50mA
Vce Saturation (Max)	400mV
Operating Temperature Range	-55°C to 110°C
Package / Case	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the FOD617D are qualified based on the following criteria:

Mandatory Compatibility Parameters:

Isolation voltage rating of 5000Vrms or higher
Single-channel transistor output configuration
4-DIP through-hole package (0.300", 7.62mm)
Operating temperature range of -55°C to 110°C
Maximum output voltage of 70V or greater
Maximum output current of 50mA or greater

Current Transfer Ratio Matching: The FOD617D specifies 160% to 320% CTR @ 10mA. Substitute parts are grouped by CTR performance to enable direct replacement or performance-equivalent selection.

Qualified Substitutes:

FOD817D (onsemi): Higher CTR performance (300-600% @ 5mA), active product status
SFH617A-1X001 (Vishay): Lower CTR (40-80% @ 10mA), higher isolation voltage (5300Vrms)
SFH617A-2X001 (Vishay): Mid-range CTR (63-125% @ 10mA), higher isolation voltage (5300Vrms)
SFH617A-3X001 (Vishay): Matched CTR (100-200% @ 10mA), higher isolation voltage (5300Vrms)
SFH617A-4X001 (Vishay): Matched CTR (160-320% @ 10mA), higher isolation voltage (5300Vrms)
VO615A-4 (Vishay): Matched CTR (160-320% @ 10mA), same isolation voltage (5000Vrms)

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ Condition	CTR Max @ Condition	Vce Sat (Max)	Vf (Typ)	If (Max)	Product Status	RoHS Status
FOD617D	onsemi	5000Vrms	160% @ 10mA	320% @ 10mA	400mV	1.35V	50mA	Obsolete	Not Specified
FOD817D	onsemi	5000Vrms	300% @ 5mA	600% @ 5mA	200mV	1.2V	50mA	Active	ROHS3 Compliant
SFH617A-1X001	Vishay	5300Vrms	40% @ 10mA	80% @ 10mA	400mV	1.35V	60mA	Active	ROHS3 Compliant
SFH617A-2X001	Vishay	5300Vrms	63% @ 10mA	125% @ 10mA	400mV	1.35V	60mA	Active	ROHS3 Compliant
SFH617A-3X001	Vishay	5300Vrms	100% @ 10mA	200% @ 10mA	400mV	1.35V	60mA	Active	ROHS3 Compliant
SFH617A-4X001	Vishay	5300Vrms	160% @ 10mA	320% @ 10mA	400mV	1.35V	60mA	Active	ROHS3 Compliant
VO615A-4	Vishay	5000Vrms	160% @ 10mA	320% @ 10mA	300mV	1.43V	60mA	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): SFH617A-4X001 and VO615A-4 provide identical current transfer ratio specifications (160-320% @ 10mA) to the FOD617D. Both are active products with ROHS3 compliance. SFH617A-4X001 offers higher isolation voltage (5300Vrms vs 5000Vrms). VO615A-4 maintains the original 5000Vrms isolation rating with lower Vce saturation (300mV vs 400mV).

Performance-Enhanced Substitutes: FOD817D delivers higher current transfer ratio (300-600% @ 5mA) with lower Vce saturation (200mV), enabling faster switching and improved noise margin. This part is active and ROHS3 compliant but operates at different CTR test conditions.

CTR-Specific Alternatives: SFH617A-2X001 and SFH617A-3X001 provide intermediate CTR ranges (63-125% and 100-200% respectively) for applications requiring lower or mid-range current transfer ratios. SFH617A-1X001 is suitable for low-CTR applications (40-80% @ 10mA).

Compliance Considerations: All substitute parts except FOD617D carry ROHS3 compliance certification. The FOD617D's obsolete status necessitates migration to active alternatives for new production.

Frequently Asked Questions (FAQ)

Q: Can FOD817D replace FOD617D in all applications? FOD817D maintains the same isolation voltage, output voltage, and output current specifications. However, it operates at different current transfer ratio test conditions (5mA vs 10mA). Applications sensitive to CTR performance at specific input currents require circuit validation.

Q: What is the difference between SFH617A variants? The SFH617A series offers four current transfer ratio grades: SFH617A-1X001 (40-80%), SFH617A-2X001 (63-125%), SFH617A-3X001 (100-200%), and SFH617A-4X001 (160-320%). Selection depends on required input current and desired output current gain. All variants share identical isolation voltage (5300Vrms), package, and thermal range.

Q: Is VO615A-4 a pin-compatible replacement? VO615A-4 uses the same 4-DIP package and pinout as FOD617D. It matches the current transfer ratio specification (160-320% @ 10mA) and maintains 5000Vrms isolation. Vce saturation is lower (300mV vs 400mV), which may improve switching performance.

Q: Do all substitutes support the same operating temperature range? All qualified substitutes operate across -55°C to 110°C, matching the FOD617D specification.

Q: Which substitute offers the best isolation voltage margin? SFH617A variants (SFH617A-1X001, SFH617A-2X001, SFH617A-3X001, SFH617A-4X001) provide 5300Vrms isolation, 300Vrms higher than the FOD617D's 5000Vrms rating.

Q: Are all substitutes available in through-hole 4-DIP packaging? All qualified substitutes are supplied in 4-DIP (0.300", 7.62mm) through-hole package format, maintaining mechanical compatibility with FOD617D footprints.

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