FOD617BSD Optoisolator Equivalent & Substitute Parts

Part Overview

The FOD617BSD 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 listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	FOD617BSD
Manufacturer	onsemi
Voltage - Isolation	5000Vrms
Number of Channels	1
Current Transfer Ratio (Min)	63% @ 10mA
Current Transfer Ratio (Max)	125% @ 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 for the FOD617BSD is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms required for direct replacement
Output Type: Transistor output configuration
Package: 4-SMD, Gull Wing surface mount
Current Transfer Ratio Range: 63% to 125% @ 10mA defines the primary performance band
Output Specifications: Maximum 70V, 50mA per channel
Operating Temperature Range: -55°C to 110°C preferred for full compatibility
Vce Saturation: 400mV maximum for switching performance

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (5000Vrms Isolation):

FOD817BSD (onsemi) - Active product status, improved performance characteristics
VO615A-2X007T (Vishay) - Active product status, equivalent isolation voltage

Category B - Higher Isolation Voltage Alternatives (5300Vrms Isolation):

SFH615A-2XSMT&R, SFH615A-3XSMT&R, SFH615A-4XSMT&R, SFH615A-4XSMT&R (Isocom) - Active product status, enhanced isolation margin

Category C - Lower Isolation Voltage Alternatives (7.5Vpk Isolation):

SFH617A-2XSMT&R, SFH617A-3XSMT&R (Isocom) - Active product status, reduced isolation specification

Parameter Comparison

Parameter	FOD617BSD	FOD817BSD	VO615A-2X007T	SFH615A-2XSMT&R	SFH615A-3XSMT&R	SFH615A-4XSMT&R	SFH617A-2XSMT&R	SFH617A-3XSMT&R
Manufacturer	onsemi	onsemi	Vishay	Isocom	Isocom	Isocom	Isocom	Isocom
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5300Vrms	5300Vrms	5300Vrms	7.5Vpk	7.5Vpk
Number of Channels	1	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	63% @ 10mA	130% @ 5mA	63% @ 10mA	63% @ 10mA	100% @ 10mA	160% @ 10mA	63% @ 10mA	100% @ 10mA
Current Transfer Ratio (Max)	125% @ 10mA	260% @ 5mA	125% @ 10mA	125% @ 10mA	200% @ 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	1.43V	1.65V (Max)	1.65V (Max)	1.65V (Max)	1.65V (Max)	1.65V (Max)
Vce Saturation (Max)	400mV	200mV	300mV	400mV	400mV	400mV	400mV	400mV
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	-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 - FOD817BSD (onsemi): FOD817BSD is the preferred direct substitute. It maintains the 5000Vrms isolation voltage and 4-SMD package of the FOD617BSD while offering active product status. The FOD817BSD demonstrates improved current transfer ratio performance (130-260% @ 5mA) and lower Vce saturation (200mV), providing enhanced switching characteristics. Full compliance with ROHS3 standards is confirmed.

Secondary Recommendation - VO615A-2X007T (Vishay): VO615A-2X007T provides equivalent 5000Vrms isolation and matching current transfer ratio range (63-125% @ 10mA). This part maintains the same operating temperature range (-55°C to 110°C) as the FOD617BSD and offers superior inventory availability (60,400 units). ROHS3 compliance is confirmed. Vce saturation of 300mV provides improved performance over the original specification.

Alternative Options - SFH615A Series (Isocom): The SFH615A series (2XSMT&R, 3XSMT&R, 4XSMT&R, 4XSMT&R) offers enhanced isolation voltage at 5300Vrms with active product status and ROHS3 compliance. These parts are suitable for applications requiring higher isolation margins. Operating temperature range is reduced to -30°C to 100°C. Current transfer ratio variants range from 63% to 320% @ 10mA, allowing selection based on specific circuit requirements.

Lower Isolation Alternative - SFH617A Series (Isocom): The SFH617A series (2XSMT&R, 3XSMT&R) provides reduced isolation specification at 7.5Vpk and should be selected only when lower isolation voltage is acceptable for the application. These parts offer active product status and ROHS3 compliance with operating temperature range of -30°C to 100°C.

Frequently Asked Questions (FAQ)

Q: Can FOD817BSD directly replace FOD617BSD in existing designs? A: Yes. FOD817BSD maintains identical isolation voltage (5000Vrms), output type (transistor), package (4-SMD, Gull Wing), and output specifications (70V max, 50mA). The improved current transfer ratio and lower Vce saturation provide enhanced performance. Verify circuit design does not depend on the specific current transfer ratio range of 63-125% @ 10mA, as FOD817BSD operates at 130-260% @ 5mA.

Q: What is the difference between 5000Vrms and 5300Vrms isolation? A: Both specifications provide adequate galvanic isolation for standard applications. The 5300Vrms rating of the SFH615A series provides a 6% higher isolation margin. Selection depends on application requirements and design safety margins. Both meet the same ECCN and HTSUS classifications.

Q: Are the Isocom SFH615A and SFH617A parts pin-compatible with FOD617BSD? A: All substitute parts maintain the 4-SMD, Gull Wing package configuration with identical pinout. Physical and electrical compatibility is confirmed for PCB layout purposes.

Q: What is the impact of operating temperature range differences? A: FOD617BSD and FOD817BSD support -55°C to 110°C operation. Isocom parts (SFH615A and SFH617A series) support -30°C to 100°C. For applications requiring operation below -30°C or above 100°C, FOD817BSD or VO615A-2X007T are required.

Q: How do current transfer ratio specifications affect circuit design? A: Current transfer ratio determines the LED input current required to achieve specified output current. FOD617BSD requires 63-125% @ 10mA input. FOD817BSD operates at 130-260% @ 5mA, requiring lower input current for equivalent output. SFH615A variants offer 63-320% @ 10mA depending on grade selection. Circuit input drive requirements must be verified against the selected substitute part's specifications.

Q: Which substitute offers the best inventory availability? A: VO615A-2X007T provides the highest inventory level at 60,400 units in stock, followed by SFH615A-4XSMT&R at 6,424 units and FOD817BSD at 1,968 units.

Q: Are all substitute parts RoHS compliant? A: Yes. All active substitute parts listed are ROHS3 compliant. The original FOD617BSD RoHS status is not specified due to its obsolete status.

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