FOD617AW Equivalent & Substitute Parts

Part Overview

The FOD617AW is a 5000Vrms optoisolator with transistor output manufactured by onsemi in a 4-DIP package. This component provides galvanic isolation for single-channel DC input applications with 50mA output current capability. The FOD617AW is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. Active alternatives from Vishay Semiconductor Opto Division and other manufacturers provide compatible electrical and mechanical specifications with enhanced isolation ratings and improved performance characteristics.

Key Parameters

Parameter	FOD617AW	Unit
Voltage - Isolation	5000	Vrms
Number of Channels	1	—
Current Transfer Ratio (Min)	40	% @ 10mA
Current Transfer Ratio (Max)	80	% @ 10mA
Voltage - Output (Max)	70	V
Current - Output / Channel	50	mA
Vce Saturation (Max)	400	mV
Operating Temperature	-55 to 110	°C
Package / Case	4-DIP (0.400", 10.16mm)	—
Mounting Type	Through Hole	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution for the FOD617AW is determined by strict equivalence across the following critical parameters:

Mandatory Compatibility Criteria:

Isolation voltage: minimum 5000Vrms (5300Vrms acceptable as higher rating)
Number of channels: 1 channel only
Output type: Transistor output
Package: 4-DIP (0.400", 10.16mm)
Mounting: Through Hole
Operating temperature range: -55°C to 110°C minimum
Output voltage rating: 70V minimum
Output current: 50mA minimum per channel

Current Transfer Ratio Grouping: Substitute parts are grouped by Current Transfer Ratio (CTR) performance at 10mA input:

Group 1 (40-80% CTR): SFH617A-1X006, SFH617A-1X016, VO615A-1X006
Group 2 (63-125% CTR): SFH617A-2X006, SFH617A-2X016
Group 3 (100-200% CTR): SFH617A-3X006, SFH617A-3X016
Group 4 (160-320% CTR): SFH617A-4X006, SFH617A-4X016

All listed substitutes meet or exceed the FOD617AW electrical specifications and maintain identical mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 10mA	CTR Max @ 10mA	Vce Sat (Max)	Product Status	RoHS Status
FOD617AW	onsemi	5000Vrms	40%	80%	400mV	Obsolete	—
SFH617A-1X006	Vishay	5300Vrms	40%	80%	400mV	Active	ROHS3
SFH617A-1X016	Vishay	5300Vrms	40%	80%	400mV	Active	ROHS3
SFH617A-2X006	Vishay	5300Vrms	63%	125%	400mV	Active	ROHS3
SFH617A-2X016	Vishay	5300Vrms	63%	125%	400mV	Active	ROHS3
SFH617A-3X006	Vishay	5300Vrms	100%	200%	400mV	Active	ROHS3
SFH617A-3X016	Vishay	5300Vrms	100%	200%	400mV	Active	ROHS3
SFH617A-4X006	Vishay	5300Vrms	160%	320%	400mV	Active	ROHS3
SFH617A-4X016	Vishay	5300Vrms	160%	320%	400mV	Active	ROHS3
VO615A-1X006	Vishay	5000Vrms	40%	80%	300mV	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Identical CTR Range): Select SFH617A-1X006, SFH617A-1X016, or VO615A-1X006 when the circuit design requires Current Transfer Ratio performance matching the FOD617AW specification of 40-80% at 10mA input. All three parts are active products with ROHS3 compliance (except VO615A-1X006 which is ROHS3 compliant). SFH617A variants offer higher isolation voltage (5300Vrms vs 5000Vrms).

For Higher CTR Performance: SFH617A-2X006, SFH617A-2X016, SFH617A-3X006, SFH617A-3X016, SFH617A-4X006, and SFH617A-4X016 provide progressively higher Current Transfer Ratio performance while maintaining all other electrical and mechanical compatibility. These parts are suitable for applications where improved CTR margin or reduced input current requirements are beneficial.

Product Status Consideration: All recommended substitutes are active products from established manufacturers with ongoing production support. The FOD617AW obsolete status necessitates transition to active alternatives for long-term supply chain reliability.

Compliance Status: All Vishay SFH617A variants are ROHS3 compliant. VO615A-1X006 is also ROHS3 compliant. All parts carry REACH Unaffected status and EAR99 ECCN classification matching the original FOD617AW.

Frequently Asked Questions (FAQ)

Q: Can SFH617A parts with higher CTR ratings directly replace FOD617AW in existing designs? A: Yes. Higher CTR ratings (SFH617A-2X, SFH617A-3X, SFH617A-4X series) are electrically compatible with FOD617AW designs. The higher CTR provides improved performance margin and typically allows reduced input drive current. No circuit modifications are required for pin-compatible 4-DIP packages.

Q: What is the difference between SFH617A-1X006 and SFH617A-1X016 variants? A: Both variants have identical electrical specifications and CTR performance (40-80% @ 10mA). The suffix designates packaging configuration. Selection depends on procurement and assembly requirements; electrical performance is equivalent.

Q: Is VO615A-1X006 a suitable substitute for FOD617AW? A: Yes. VO615A-1X006 matches the FOD617AW isolation voltage (5000Vrms) and CTR range (40-80% @ 10mA). It offers improved Vce saturation (300mV vs 400mV) and is an active product with ROHS3 compliance. Slightly different turn-on/turn-off timing characteristics apply; verify timing requirements in application-specific designs.

Q: Are all substitute parts available in the same 4-DIP package? A: Yes. All listed substitutes use identical 4-DIP (0.400", 10.16mm) through-hole packaging. Direct mechanical and electrical pin compatibility is maintained across all alternatives.

Q: What is the significance of the CTR grouping in substitute selection? A: Current Transfer Ratio determines the input current required to achieve specified output current. FOD617AW requires 40-80% CTR at 10mA input. Higher CTR variants (SFH617A-2X through SFH617A-4X) reduce input current requirements while maintaining output capability. Select based on circuit input drive capability and performance margin requirements.

Q: Do all substitutes meet the same isolation voltage requirement? A: FOD617AW specifies 5000Vrms isolation. SFH617A variants provide 5300Vrms (higher rating). VO615A-1X006 matches 5000Vrms exactly. All exceed or meet the minimum isolation requirement. Higher isolation ratings provide additional safety margin without circuit impact.

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