FOD617CW Optoisolator Equivalent & Substitute Parts

Part Overview

The FOD617CW 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 current capability and 70V maximum output voltage. The FOD617CW 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 while offering current product status and enhanced compliance certifications.

Key Parameters

Parameter	FOD617CW	Unit
Voltage - Isolation	5000	Vrms
Number of Channels	1	—
Current Transfer Ratio (Min)	100	% @ 10mA
Current Transfer Ratio (Max)	200	% @ 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	—

Substitute Part Grouping Explanation

Substitution of the FOD617CW is determined by the following critical parameters:

Electrical Compatibility Requirements:

Isolation voltage: minimum 5000Vrms (5300Vrms acceptable as higher rating)
Number of channels: 1 (single channel only)
Output type: Transistor
Input type: DC
Maximum output voltage: 70V or greater
Output current per channel: 50mA or greater
Operating temperature range: -55°C to 110°C or wider

Mechanical Compatibility Requirements:

Package type: 4-DIP (0.400", 10.16mm)
Mounting type: Through Hole
Supplier device package: 4-DIP

Current Transfer Ratio (CTR) Grouping: Substitute parts are grouped by CTR specifications at 10mA input current. The FOD617CW operates at 100–200% CTR. Vishay SFH617A series variants provide multiple CTR grades (40–80%, 63–125%, 100–200%, 160–320%) allowing selection based on circuit requirements. The VO615A-3X006 provides identical CTR range (100–200%) with 5000Vrms isolation matching the original specification.

All listed substitutes meet or exceed the electrical and mechanical requirements of the FOD617CW while maintaining 4-DIP through-hole package compatibility.

Parameter Comparison

Parameter	FOD617CW	SFH617A-1X006	SFH617A-2X006	SFH617A-3X006	SFH617A-4X006	VO615A-3X006
Manufacturer	onsemi	Vishay	Vishay	Vishay	Vishay	Vishay
Voltage - Isolation	5000Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5000Vrms
Number of Channels	1	1	1	1	1	1
CTR Min @ 10mA	100%	40%	63%	100%	160%	100%
CTR Max @ 10mA	200%	80%	125%	200%	320%	200%
Voltage - Output (Max)	70V	70V	70V	70V	70V	70V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV	300mV
Operating Temperature	-55 to 110°C	-55 to 110°C	-55 to 110°C	-55 to 110°C	-55 to 110°C	-55 to 110°C
Package / Case	4-DIP	4-DIP	4-DIP	4-DIP	4-DIP	4-DIP
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical CTR Range): Select SFH617A-3X006 or SFH617A-3X016 for direct electrical substitution. Both parts provide 100–200% CTR matching the FOD617CW specification, 5300Vrms isolation (exceeding 5000Vrms requirement), and active product status with ROHS3 compliance. SFH617A-3X006 offers higher inventory availability (105,300 pcs) compared to SFH617A-3X016 (65,300 pcs).

For Identical Isolation Voltage: Select VO615A-3X006 when 5000Vrms isolation voltage must be maintained exactly. This part provides matching 100–200% CTR and 5000Vrms isolation with active product status and ROHS3 compliance. The VO615A-3X006 features lower Vce saturation (300mV vs. 400mV), providing improved switching performance.

For Lower CTR Applications: Select SFH617A-1X006 (40–80% CTR) or SFH617A-2X006 (63–125% CTR) when circuit design permits reduced current transfer ratio, enabling use of lower-gain optoisolator grades with higher inventory availability.

For Higher CTR Applications: Select SFH617A-4X006 or SFH617A-4X016 (160–320% CTR) when circuit design requires higher current transfer ratio performance.

All recommended substitutes are active products with current manufacturing support, ROHS3 compliance, and identical 4-DIP through-hole package compatibility.

Frequently Asked Questions (FAQ)

Q: Can SFH617A series parts with 5300Vrms isolation replace the FOD617CW rated at 5000Vrms?

A: Yes. The 5300Vrms isolation rating of SFH617A variants exceeds the 5000Vrms requirement of the FOD617CW. Higher isolation voltage ratings provide equivalent or superior performance in applications designed for 5000Vrms isolation.

Q: What is the significance of CTR (Current Transfer Ratio) grades in the SFH617A series?

A: CTR grade determines the output current produced for a given input current. The FOD617CW operates at 100–200% CTR. SFH617A-1X006 (40–80%), SFH617A-2X006 (63–125%), SFH617A-3X006 (100–200%), and SFH617A-4X006 (160–320%) provide different CTR ranges. Selection depends on circuit input current levels and required output current. For direct replacement, use SFH617A-3X006 matching the 100–200% range.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All listed substitutes use the 4-DIP (0.400", 10.16mm) package with through-hole mounting, providing identical PCB footprint compatibility with the FOD617CW.

Q: What is the difference between SFH617A-3X006 and SFH617A-3X016?

A: Both parts provide identical electrical specifications (5300Vrms isolation, 100–200% CTR, 70V output, 50mA output current). The difference is packaging: -3X006 uses tube packaging while -3X016 uses alternative packaging. Electrical performance and 4-DIP footprint are identical.

Q: Why is the FOD617CW classified as obsolete?

A: The FOD617CW is no longer in active production. Active alternatives from Vishay Semiconductor Opto Division (SFH617A series and VO615A series) provide equivalent or superior electrical specifications with current manufacturing support and modern compliance certifications (ROHS3).

Q: Does VO615A-3X006 offer any performance advantages over SFH617A-3X006?

A: The VO615A-3X006 provides lower Vce saturation (300mV vs. 400mV), resulting in reduced power dissipation and improved switching speed. Both parts maintain identical 5000Vrms isolation and 100–200% CTR specifications. Selection depends on whether exact 5000Vrms isolation voltage is required or if 5300Vrms is acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All Vishay SFH617A and VO615A variants listed are ROHS3 compliant. The original FOD617CW does not specify RoHS status. Substitution with ROHS3-compliant parts ensures compliance with current environmental regulations.

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