FOD617DS Equivalent & Substitute Parts

Part Overview

The FOD617DS 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 a maximum output current of 50mA per channel. The FOD617DS is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute optoisolators must maintain compatibility across isolation voltage, output characteristics, and thermal operating range to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	FOD617DS
Manufacturer	onsemi
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	160% @ 10mA
Current Transfer Ratio (Max)	320% @ 10mA
Rise / Fall Time (Typ)	4µs, 3µs
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Voltage - Forward (Vf) (Typ)	1.35V
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 110°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Input Type	DC
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the FOD617DS is determined by the following critical parameters:

Primary Compatibility Criteria:

Single-channel transistor output optoisolator configuration
Isolation voltage rating of 5000Vrms or higher
Maximum output voltage of 70V or greater
Maximum output current of 50mA or greater per channel
4-SMD surface mount package with gull wing leads
DC input type
Operating temperature range that encompasses or exceeds -55°C to 110°C

Substitute Parts Identified:

Group 1 - Direct onsemi Equivalent:

FOD817DS: Active product status, identical isolation voltage (5000Vrms), same package configuration, superior current transfer ratio performance

Group 2 - Isocom SFH615A Series (5300Vrms Isolation):

SFH615A-2XSMT&R, SFH615A-3XSMT&R, SFH615A-4XSM, SFH615A-4XSMT&R: Higher isolation voltage (5300Vrms), active product status, identical package type, varying current transfer ratios

Group 3 - Isocom SFH617A Series (7.5Vpk Isolation):

SFH617A-2XSMT&R, SFH617A-3XSMT&R: Lower isolation voltage specification (7.5Vpk), active product status, identical package configuration

All substitute parts maintain the required 4-SMD gull wing surface mount package, 50mA output current capability, and 70V maximum output voltage. Differences in current transfer ratio, forward voltage, and saturation voltage are within acceptable substitution parameters for transistor output optoisolators.

Parameter Comparison

Parameter	FOD617DS	FOD817DS	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
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
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)	160% @ 10mA	300% @ 5mA	63% @ 10mA	100% @ 10mA	160% @ 10mA	160% @ 10mA	63% @ 10mA	100% @ 10mA
Current Transfer Ratio (Max)	320% @ 10mA	600% @ 5mA	125% @ 10mA	200% @ 10mA	320% @ 10mA	320% @ 10mA	125% @ 10mA	200% @ 10mA
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	3µs, 14µs	3µs, 14µs	4.6µs, 15µs	4.6µs, 15µs	4µs, 3µs	4µs, 3µs
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
Input Type	DC	DC	DC	DC	DC	DC	DC	DC
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

FOD817DS (onsemi) is the primary recommended substitute for the obsolete FOD617DS. Both components are manufactured by onsemi, share identical isolation voltage (5000Vrms), package configuration (4-SMD gull wing), and operating temperature range (-55°C to 110°C). The FOD817DS maintains active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. The FOD817DS exhibits superior current transfer ratio performance (300-600% @ 5mA) compared to the FOD617DS (160-320% @ 10mA) and lower Vce saturation (200mV vs 400mV), providing improved switching characteristics.

SFH615A Series (Isocom) optoisolators provide higher isolation voltage (5300Vrms) with active product status and ROHS3 compliance. The SFH615A-4XSM and SFH615A-4XSMT&R variants match the FOD617DS current transfer ratio specification (160-320% @ 10mA). However, these parts operate within a reduced temperature range (-30°C to 100°C), which may not accommodate applications requiring the full -55°C to 110°C thermal envelope of the FOD617DS.

SFH617A Series (Isocom) optoisolators feature lower isolation voltage (7.5Vpk) and are suitable only for applications where reduced isolation voltage is acceptable. These parts maintain active product status and ROHS3 compliance but operate within the restricted temperature range (-30°C to 100°C).

For new designs requiring the full thermal operating range and 5000Vrms isolation voltage of the FOD617DS, the FOD817DS is the optimal selection. For applications with relaxed temperature requirements and higher isolation voltage tolerance, SFH615A-4XSM or SFH615A-4XSMT&R provide viable alternatives with enhanced isolation performance.

Frequently Asked Questions (FAQ)

Q: Can the FOD817DS directly replace the FOD617DS in existing designs?

A: Yes. The FOD817DS is functionally equivalent to the FOD617DS across all critical parameters: single-channel transistor output, 5000Vrms isolation voltage, 4-SMD gull wing package, 50mA output current, and -55°C to 110°C operating temperature range. The FOD817DS is pin-compatible and maintains the same electrical interface. The superior current transfer ratio and lower saturation voltage of the FOD817DS may improve circuit performance.

Q: What is the key difference between the onsemi FOD817DS and the Isocom SFH615A series?

A: The primary difference is isolation voltage rating. The FOD817DS maintains 5000Vrms isolation identical to the FOD617DS, while the SFH615A series provides higher isolation at 5300Vrms. The SFH615A series operates within a narrower temperature range (-30°C to 100°C) compared to the FOD817DS (-55°C to 110°C). For applications requiring the full thermal envelope of the original FOD617DS, the FOD817DS is the appropriate selection.

Q: Are the SFH617A-2XSMT&R and SFH617A-3XSMT&R suitable substitutes?

A: The SFH617A series is not recommended as a direct substitute for the FOD617DS. The isolation voltage specification (7.5Vpk) is significantly lower than the FOD617DS requirement (5000Vrms). These parts are suitable only for applications where reduced isolation voltage is acceptable. Additionally, the operating temperature range (-30°C to 100°C) does not extend to the -55°C minimum of the FOD617DS.

Q: What packaging options are available for substitute parts?

A: All substitute parts maintain the 4-SMD gull wing surface mount package configuration required for FOD617DS replacement. Packaging variants differ in delivery format: tube packaging (FOD817DS, SFH615A-4XSM) or tape and reel (SFH615A-2XSMT&R, SFH615A-3XSMT&R, SFH615A-4XSMT&R, SFH617A-2XSMT&R, SFH617A-3XSMT&R). Tape and reel packaging is standard for high-volume production; tube packaging is suitable for lower-volume applications.

Q: Do all substitute parts meet RoHS and REACH compliance requirements?

A: All substitute parts are ROHS3 compliant and REACH unaffected. The original FOD617DS does not specify RoHS status. For new designs requiring regulatory compliance, the FOD817DS, SFH615A series, and SFH617A series all meet current environmental standards.

Q: How do current transfer ratio specifications affect substitution?

A: Current transfer ratio determines the optical coupling efficiency between the LED input and transistor output. The FOD617DS specifies 160-320% @ 10mA. The FOD817DS exceeds this specification (300-600% @ 5mA), providing superior performance. The SFH615A-4XSM and SFH615A-4XSMT&R match the FOD617DS specification (160-320% @ 10mA). Lower-ratio variants (SFH615A-2XSMT&R at 63-125% @ 10mA, SFH617A-2XSMT&R at 63-125% @ 10mA) require circuit design verification to ensure adequate input drive current.

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