FOD617CS Equivalent & Substitute Parts

Part Overview

The FOD617CS 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 FOD617CS is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support.

Key Parameters

Parameter	FOD617CS Value
Voltage - Isolation	5000Vrms
Number of Channels	1
Current Transfer Ratio (Min)	100% @ 10mA
Current Transfer Ratio (Max)	200% @ 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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the FOD617CS is determined by the following critical parameters:

Primary Compatibility Criteria:

Isolation voltage rating (minimum 5000Vrms)
Single channel configuration
Transistor output type
Maximum output voltage of 70V
Output current capability of 50mA
4-SMD surface mount package with gull wing leads
Operating temperature range compatibility

Substitute Categories:

Category 1: Direct onsemi Replacement FOD817CS meets all primary criteria with enhanced current transfer ratio performance and improved Vce saturation characteristics. Active product status ensures long-term availability.

Category 2: Isocom SFH615A Series SFH615A-2XSMT&R, SFH615A-3XSMT&R, SFH615A-4XSM, and SFH615A-4XSMT&R provide 5300Vrms isolation with identical output specifications. These parts offer higher isolation voltage margin and multiple current transfer ratio grades. Operating temperature range is -30°C ~ 100°C, which is narrower than the FOD617CS.

Category 3: Isocom SFH617A Series SFH617A-2XSMT&R and SFH617A-3XSMT&R provide isolation at 7.5Vpk with matching output characteristics. Operating temperature range is -30°C ~ 100°C.

Parameter Comparison

Parameter	FOD617CS	FOD817CS	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
Voltage - Isolation	5000Vrms	5000Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	7.5Vpk	7.5Vpk
Number of Channels	1	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	100% @ 10mA	200% @ 5mA	63% @ 10mA	100% @ 10mA	160% @ 10mA	160% @ 10mA	63% @ 10mA	100% @ 10mA
Current Transfer Ratio (Max)	200% @ 10mA	400% @ 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
Voltage - Forward (Vf) (Typ)	1.35V	1.2V	1.65V (Max)	1.65V (Max)	1.65V (Max)	1.65V (Max)	1.65V (Max)	1.65V (Max)
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

FOD817CS is the primary substitute for new designs. As an active onsemi product with ROHS3 compliance, it maintains manufacturer support and supply continuity. The FOD817CS provides superior performance with higher current transfer ratio (200% minimum at 5mA versus 100% at 10mA) and lower Vce saturation (200mV versus 400mV), enabling more efficient circuit operation. Both parts share identical isolation voltage, output specifications, and operating temperature range.

SFH615A Series (all variants) offers higher isolation voltage margin at 5300Vrms with ROHS3 compliance and active product status. These parts are suitable when additional isolation voltage headroom is required. The SFH615A-3XSMT&R and SFH615A-4XSMT&R variants provide current transfer ratios matching or exceeding the FOD617CS. Operating temperature range is limited to -30°C ~ 100°C; applications requiring operation below -30°C or above 100°C are not compatible.

SFH617A Series (SFH617A-2XSMT&R and SFH617A-3XSMT&R) provides alternative isolation specification at 7.5Vpk with ROHS3 compliance and active status. The SFH617A-3XSMT&R matches the FOD617CS current transfer ratio specification. These parts are suitable for applications where the lower isolation voltage specification is acceptable. Operating temperature range is -30°C ~ 100°C.

Frequently Asked Questions (FAQ)

Q: Can FOD817CS directly replace FOD617CS in existing designs? A: Yes. FOD817CS is pin-compatible with identical package, isolation voltage, output voltage, and output current specifications. The enhanced current transfer ratio and lower saturation voltage provide improved performance. No circuit modifications are required.

Q: What is the key difference between FOD617CS and SFH615A series optoisolators? A: The SFH615A series provides higher isolation voltage (5300Vrms versus 5000Vrms) and is manufactured by Isocom rather than onsemi. All other electrical and mechanical specifications are compatible. Operating temperature range is narrower (-30°C ~ 100°C versus -55°C ~ 110°C).

Q: Are SFH617A-2XSMT&R and SFH617A-3XSMT&R suitable substitutes? A: SFH617A-3XSMT&R is compatible with matching current transfer ratio. SFH617A-2XSMT&R has lower current transfer ratio (63% minimum) and is not recommended as a direct substitute. Both have narrower operating temperature range (-30°C ~ 100°C).

Q: What packaging options are available for substitute parts? A: FOD817CS is supplied in Tube packaging. SFH615A and SFH617A series are available in Tape & Reel (TR) or Tube packaging. All maintain identical 4-SMD gull wing package geometry for PCB compatibility.

Q: Do all substitute parts meet RoHS compliance? A: FOD817CS and all Isocom SFH615A and SFH617A variants are ROHS3 compliant. The original FOD617CS RoHS status is not specified in available documentation.

Q: Which substitute is recommended for new production designs? A: FOD817CS is the recommended primary substitute, offering active product status, ROHS3 compliance, superior electrical performance, and long-term manufacturer support from onsemi.

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