FOD617AS Equivalent & Substitute Parts

Part Overview

The FOD617AS is a single-channel optoisolator with transistor output manufactured by onsemi, rated for 5000Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The FOD617AS operates across a temperature range of -55°C to 110°C and is packaged in 4-SMD surface mount configuration with gull wing leads.

Key Parameters

Parameter	FOD617AS
Manufacturer	onsemi
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	40% @ 10mA
Current Transfer Ratio (Max)	80% @ 10mA
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 110°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the FOD617AS is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms required for direct replacement
Number of Channels: Must be 1 channel
Output Type: Transistor output configuration
Maximum Output Voltage: 70V capability
Maximum Output Current: 50mA per channel
Package Configuration: 4-SMD, Gull Wing surface mount
Input Type: DC input

Substitute parts are grouped into two categories based on isolation voltage specifications:

Category 1 - Direct Isolation Voltage Match (5000Vrms): FOD817AS from onsemi maintains identical isolation voltage rating with improved electrical characteristics.

Category 2 - Higher Isolation Voltage (5300Vrms): SFH615A and SFH617A series from Isocom Components 2004 LTD provide enhanced isolation voltage margin while maintaining all other critical parameters within acceptable ranges.

Parameter Comparison

Parameter	FOD617AS	FOD817AS	SFH615A-2XSMT&R	SFH615A-3XSMT&R	SFH615A-4XSM	SFH615A-4XSMT&R	SFH617A-2XSMT&R	SFH617A-3XSMT&R
Manufacturer	onsemi	onsemi	Isocom	Isocom	Isocom	Isocom	Isocom	Isocom
Number of Channels	1	1	1	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	7.5Vpk	7.5Vpk
Current Transfer Ratio (Min)	40% @ 10mA	80% @ 5mA	63% @ 10mA	100% @ 10mA	160% @ 10mA	160% @ 10mA	63% @ 10mA	100% @ 10mA
Current Transfer Ratio (Max)	80% @ 10mA	160% @ 5mA	125% @ 10mA	200% @ 10mA	320% @ 10mA	320% @ 10mA	125% @ 10mA	200% @ 10mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	70V	70V	70V	70V	70V	70V	70V	70V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	400mV	200mV	400mV	400mV	400mV	400mV	400mV	400mV
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: FOD817AS

The FOD817AS from onsemi is the preferred direct substitute for the obsolete FOD617AS. Both components share identical isolation voltage (5000Vrms), operating temperature range (-55°C to 110°C), and package configuration. The FOD817AS offers improved electrical performance with higher current transfer ratio (80-160% @ 5mA versus 40-80% @ 10mA) and lower Vce saturation (200mV versus 400mV). The FOD817AS maintains active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Secondary Recommendation: SFH615A Series (SFH615A-2XSMT&R, SFH615A-3XSMT&R, SFH615A-4XSM, SFH615A-4XSMT&R)

The SFH615A series from Isocom Components 2004 LTD provides higher isolation voltage (5300Vrms) with active product status and ROHS3 compliance. These parts are suitable for applications requiring enhanced isolation margin. The SFH615A-4 variants offer significantly higher current transfer ratios (160-320% @ 10mA), which may require circuit design adjustment. Operating temperature range is reduced to -30°C to 100°C, making these parts unsuitable for applications requiring the full -55°C to 110°C range of the FOD617AS.

Tertiary Recommendation: SFH617A Series (SFH617A-2XSMT&R, SFH617A-3XSMT&R)

The SFH617A series from Isocom Components 2004 LTD provides isolation voltage specification of 7.5Vpk with active product status and ROHS3 compliance. These parts maintain current transfer ratio characteristics comparable to lower-grade SFH615A variants. Operating temperature range is -30°C to 100°C. The isolation voltage specification format differs from the FOD617AS (Vpk versus Vrms), requiring engineering evaluation for specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can FOD817AS directly replace FOD617AS without circuit modification?

A: Yes. The FOD817AS maintains identical isolation voltage (5000Vrms), output voltage rating (70V), output current rating (50mA), and package configuration (4-SMD, Gull Wing). The improved electrical characteristics (higher CTR, lower Vce saturation) are beneficial and do not require circuit redesign for most applications.

Q: What is the key difference between FOD817AS and SFH615A series?

A: The FOD817AS maintains the original -55°C to 110°C operating temperature range, while SFH615A series is limited to -30°C to 100°C. For applications requiring extended low-temperature operation below -30°C, FOD817AS is the appropriate choice. SFH615A series offers higher isolation voltage (5300Vrms) for applications requiring enhanced isolation margin.

Q: Are SFH617A parts suitable replacements for FOD617AS?

A: SFH617A parts share identical package configuration and output ratings but specify isolation voltage as 7.5Vpk rather than 5000Vrms. This difference in specification format requires engineering evaluation. The reduced operating temperature range (-30°C to 100°C) makes these parts unsuitable for applications requiring -55°C operation.

Q: What packaging options are available for substitute parts?

A: FOD817AS is supplied in Tube packaging. SFH615A and SFH617A series are available in both Tape & Reel (TR) and Tube packaging options. Tape & Reel packaging is designated with "XSMT&R" suffix, while Tube packaging is designated with "XSM" suffix. Select packaging based on production volume and assembly equipment compatibility.

Q: Do all substitute parts meet RoHS compliance?

A: FOD817AS and all SFH615A and SFH617A variants are ROHS3 compliant. The original FOD617AS does not specify RoHS status. For applications requiring RoHS compliance, all listed substitute parts are acceptable.

Q: How do current transfer ratio differences affect circuit design?

A: The FOD617AS specifies 40-80% CTR @ 10mA. Substitute parts offer higher CTR values, particularly SFH615A-4 variants (160-320% @ 10mA). Higher CTR reduces input current requirements for a given output current. Circuit designs relying on specific CTR values should be evaluated to confirm compatibility with substitute part specifications.

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