FOD617CSD Equivalent & Substitute Parts

Part Overview

The FOD617CSD is a 5000Vrms optoisolator with transistor output manufactured by onsemi in a 4-SMD surface mount package. This component provides galvanic isolation for single-channel DC input applications with 50mA output current capability. The part is currently obsolete, making equivalent substitutes necessary for new designs or component replenishment. Substitute parts must maintain compatibility across isolation voltage, output current, package type, and thermal operating range.

Key Parameters

Parameter	FOD617CSD Value
Voltage - Isolation	5000Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	100% @ 10mA
Current Transfer Ratio (Max)	200% @ 10mA
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
Input Type	DC
Voltage - Forward (Vf) (Typ)	1.35V
Current - DC Forward (If) (Max)	50mA

Substitute Part Grouping Explanation

Substitution eligibility for the FOD617CSD is determined by the following critical parameters:

Primary Compatibility Criteria:

Isolation voltage rating of 5000Vrms or higher
Single-channel transistor output configuration
50mA maximum output current capability
70V maximum output voltage rating
4-SMD surface mount package with gull wing leads
DC input type

Secondary Compatibility Criteria:

Operating temperature range that encompasses or exceeds -55°C to 110°C
Current transfer ratio specifications that support the application's switching requirements
Vce saturation characteristics suitable for the load impedance

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

Category A - 5000Vrms Isolation (Direct Equivalents): FOD817CSD, VO615A-3X007T

Category B - 5300Vrms Isolation (Enhanced Isolation): SFH615A-2XSMT&R, SFH615A-3XSMT&R, SFH615A-4XSM, SFH615A-4XSMT&R

Category C - Lower Isolation Voltage (Not Recommended): SFH617A-2XSMT&R, SFH617A-3XSMT&R (7.5Vpk isolation - incompatible)

Parameter Comparison

Parameter	FOD617CSD	FOD817CSD	VO615A-3X007T	SFH615A-2XSMT&R	SFH615A-3XSMT&R	SFH615A-4XSM	SFH615A-4XSMT&R
Manufacturer	onsemi	onsemi	Vishay	Isocom	Isocom	Isocom	Isocom
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms
Number of Channels	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	100% @ 10mA	200% @ 5mA	100% @ 10mA	63% @ 10mA	100% @ 10mA	160% @ 10mA	160% @ 10mA
Current Transfer Ratio (Max)	200% @ 10mA	400% @ 5mA	200% @ 10mA	125% @ 10mA	200% @ 10mA	320% @ 10mA	320% @ 10mA
Voltage - Output (Max)	70V	70V	70V	70V	70V	70V	70V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	400mV	200mV	300mV	400mV	400mV	400mV	400mV
Voltage - Forward (Vf) (Typ)	1.35V	1.2V	1.43V	1.65V (Max)	1.65V (Max)	1.65V (Max)	1.65V (Max)
Current - DC Forward (If) (Max)	50mA	50mA	60mA	50mA	50mA	50mA	50mA
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C
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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Input Type	DC	DC	DC	DC	DC	DC	DC
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Recommended Primary Substitutes (5000Vrms Category):

FOD817CSD is the preferred substitute. It maintains identical isolation voltage and package specifications while offering improved performance characteristics: higher current transfer ratio (200-400% @ 5mA vs. 100-200% @ 10mA), lower Vce saturation (200mV vs. 400mV), and lower forward voltage (1.2V vs. 1.35V). Product status is active with ROHS3 compliance.

VO615A-3X007T provides equivalent isolation voltage and current transfer ratio matching. It offers lower Vce saturation (300mV) and slightly higher forward voltage (1.43V). Manufactured by Vishay with ROHS3 compliance and active product status.

Secondary Substitutes (5300Vrms Category):

SFH615A series parts from Isocom provide enhanced isolation voltage (5300Vrms) suitable for applications requiring higher isolation margins. All variants maintain 4-SMD gull wing packaging and 50mA output current. Selection within this series depends on current transfer ratio requirements:

SFH615A-2XSMT&R: 63-125% CTR @ 10mA
SFH615A-3XSMT&R: 100-200% CTR @ 10mA (closest CTR match to FOD617CSD)
SFH615A-4XSM and SFH615A-4XSMT&R: 160-320% CTR @ 10mA

All SFH615A variants carry ROHS3 compliance and active product status. Operating temperature range is -30°C to 100°C, which is narrower than the FOD617CSD specification.

Not Recommended:

SFH617A-2XSMT&R and SFH617A-3XSMT&R feature 7.5Vpk isolation voltage, which is insufficient for applications requiring 5000Vrms isolation and are therefore incompatible.

Frequently Asked Questions (FAQ)

Q: Can FOD817CSD directly replace FOD617CSD in existing designs?

A: Yes. FOD817CSD maintains identical isolation voltage (5000Vrms), output current (50mA), maximum output voltage (70V), and 4-SMD gull wing package. The improved performance characteristics (higher CTR, lower Vce saturation) make it a superior direct replacement. No circuit modifications are required.

Q: What is the difference between 5000Vrms and 5300Vrms isolation ratings?

A: The 5300Vrms rating provides approximately 6% higher isolation voltage margin. For applications designed around 5000Vrms isolation, both ratings are functionally equivalent. The 5300Vrms parts offer additional safety margin in high-voltage isolation applications.

Q: Why do some substitutes have different current transfer ratio specifications?

A: Current transfer ratio (CTR) varies by manufacturer and part variant. CTR determines the output current for a given input current. Parts with higher CTR require less input current to achieve the same output switching. Selection should match the application's input drive capability and output load requirements.

Q: Are the Isocom SFH615A parts suitable for -55°C operation?

A: No. SFH615A series parts specify -30°C to 100°C operating temperature. Applications requiring -55°C operation must use FOD617CSD, FOD817CSD, or VO615A-3X007T, which all support -55°C to 110°C.

Q: What packaging options are available for substitutes?

A: All recommended substitutes use 4-SMD surface mount packages with gull wing leads, maintaining PCB footprint compatibility. Packaging variants (Cut Tape, Tape & Reel, Tube) affect supply and handling but do not impact electrical performance or board-level compatibility.

Q: Is ROHS3 compliance required for my application?

A: ROHS3 compliance is mandatory for products sold in the European Union and many other markets. FOD817CSD, VO615A-3X007T, and all SFH615A variants are ROHS3 compliant. Verify compliance requirements for your specific application and market.

Q: Can I use VO615A-3X007T as a substitute?

A: Yes. VO615A-3X007T matches the FOD617CSD across all critical parameters: 5000Vrms isolation, 100-200% CTR @ 10mA, 50mA output current, and -55°C to 110°C operating range. It offers slightly lower Vce saturation (300mV vs. 400mV) and is ROHS3 compliant with active product status.

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