FOD617BS Equivalent & Substitute Parts

Part Overview

The FOD617BS 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 FOD617BS 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 current, package type, and thermal operating range to ensure direct functional replacement.

Key Parameters

Parameter	FOD617BS Value
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute optoisolators for the FOD617BS are grouped based on the following critical parameters that determine functional equivalence:

Primary Compatibility Criteria:

Isolation voltage rating (minimum 5000Vrms)
Single channel configuration
Transistor output type
4-SMD surface mount package with gull wing leads
Maximum output current of 50mA
Maximum output voltage of 70V
Moisture sensitivity level MSL 1

Substitution Logic: Parts are classified into two categories based on isolation voltage specification. The FOD817BS maintains the exact 5000Vrms isolation rating with improved current transfer ratio performance. The SFH615A and SFH617A series from Isocom Components provide higher isolation voltage ratings (5300Vrms or 7.5Vpk) with equivalent or superior electrical characteristics, making them suitable for applications where the FOD617BS isolation specification can be exceeded. All substitute parts maintain the same package footprint, output current capability, and thermal operating envelope required for direct PCB replacement.

Parameter Comparison

Parameter	FOD617BS	FOD817BS	SFH615A-2XSMT&R	SFH615A-3XSMT&R	SFH615A-4XSM	SFH615A-4XSMT&R	SFH617A-2XSMT&R	SFH617A-3XSMT&R
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)	63% @ 10mA	130% @ 5mA	63% @ 10mA	100% @ 10mA	160% @ 10mA	160% @ 10mA	63% @ 10mA	100% @ 10mA
Current Transfer Ratio (Max)	125% @ 10mA	260% @ 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
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
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

FOD817BS (onsemi): Direct replacement for FOD617BS with identical isolation voltage and package specifications. FOD817BS is active product status with ROHS3 compliance. Superior current transfer ratio performance (130-260% @ 5mA) and lower Vce saturation (200mV) provide improved switching characteristics. Maintains the full operating temperature range of -55°C to 110°C. Recommended as primary substitute for applications requiring exact electrical compatibility with the obsolete FOD617BS.

SFH615A Series (Isocom Components 2004 LTD): Active products with ROHS3 compliance offering 5300Vrms isolation, exceeding the FOD617BS 5000Vrms specification. Available in multiple current transfer ratio grades (63-125%, 100-200%, 160-320% @ 10mA). Operating temperature range limited to -30°C to 100°C. SFH615A-4XSM and SFH615A-4XSMT&R variants provide highest current transfer ratio performance. Suitable for applications where extended isolation margin is acceptable and operating temperature does not require the full -55°C lower limit.

SFH617A Series (Isocom Components 2004 LTD): Active products with ROHS3 compliance. Isolation voltage specified as 7.5Vpk, which differs from the Vrms specification of FOD617BS and requires application-level verification for compatibility. Available in two current transfer ratio grades (63-125%, 100-200% @ 10mA). Operating temperature range -30°C to 100°C. Identical rise and fall time characteristics (4µs, 3µs) to FOD617BS. Selection requires confirmation that 7.5Vpk isolation specification meets application requirements.

Frequently Asked Questions (FAQ)

Q: Can FOD817BS directly replace FOD617BS without circuit modification? A: Yes. FOD817BS maintains identical isolation voltage (5000Vrms), output current (50mA), maximum output voltage (70V), package type (4-SMD gull wing), and operating temperature range (-55°C to 110°C). Superior current transfer ratio and lower saturation voltage represent performance improvements compatible with existing circuit designs.

Q: What is the difference between 5000Vrms and 5300Vrms isolation ratings? A: 5300Vrms isolation exceeds the 5000Vrms requirement, providing additional safety margin. SFH615A series parts with 5300Vrms rating are suitable for applications where the FOD617BS isolation specification can be exceeded. Applications with specific isolation voltage requirements must confirm that higher ratings do not conflict with system design constraints.

Q: Why do SFH617A parts specify 7.5Vpk instead of Vrms? A: SFH617A isolation voltage is specified in peak volts (Vpk) rather than RMS volts (Vrms). Direct comparison with FOD617BS 5000Vrms specification requires conversion and application-level verification. Consult component datasheets for isolation voltage measurement methodology before selecting SFH617A for applications with strict isolation requirements.

Q: Are all substitute parts available in the same packaging options? A: FOD817BS is supplied in Tube packaging. SFH615A and SFH617A series are available in both Tape & Reel (TR) and Tube packaging options. Verify packaging availability with supplier inventory before design selection to confirm compatibility with assembly processes.

Q: What is the impact of operating temperature range differences? A: FOD617BS operates from -55°C to 110°C. SFH615A and SFH617A series operate from -30°C to 100°C. Applications requiring operation below -30°C or above 100°C must use FOD817BS or FOD617BS. Verify application temperature requirements before selecting Isocom Components alternatives.

Q: How do current transfer ratio specifications affect circuit design? A: Current transfer ratio determines the output current for a given input current. FOD617BS specifies 63-125% @ 10mA. FOD817BS provides 130-260% @ 5mA, indicating higher efficiency at lower input current. SFH615A and SFH617A series offer multiple grades with ratios up to 320% @ 10mA. Circuit designs must account for the specific current transfer ratio grade selected to ensure proper output current levels.

Q: Are all substitute parts RoHS compliant? A: FOD817BS, SFH615A series, and SFH617A series are all ROHS3 compliant. FOD617BS RoHS status is not specified in available documentation. Confirm RoHS compliance requirements with design specifications before final part selection.

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