FOD617A3SD Equivalent & Substitute Parts

Part Overview

The FOD617A3SD 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 part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Isolation Voltage	5000Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	40% @ 10mA
Current Transfer Ratio (Max)	80% @ 10mA
Maximum Output Voltage	70V
Maximum Output Current	50mA
Rise / Fall Time	4µs / 3µs
Operating Temperature Range	-55°C to 110°C
Package Type	4-SMD, Gull Wing
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the FOD617A3SD is determined by the following critical parameters:

Isolation voltage rating of 5000Vrms
Single-channel transistor output configuration
4-SMD surface mount package with gull wing leads
Operating temperature range of -55°C to 110°C
Maximum output specifications: 70V and 50mA per channel
Input type: DC

Two substitute parts meet these core requirements: the FOD817A3SD (onsemi) and VO615A-1X017T (Vishay Semiconductor Opto Division). Both maintain identical isolation voltage, channel count, package configuration, and temperature range. Variations in current transfer ratio, forward voltage, and saturation voltage are within acceptable substitution parameters for this product category.

Parameter Comparison

Parameter	FOD617A3SD	FOD817A3SD	VO615A-1X017T
Manufacturer	onsemi	onsemi	Vishay Semiconductor Opto Division
Product Status	Obsolete	Active	Active
Isolation Voltage	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1
Current Transfer Ratio (Min)	40% @ 10mA	80% @ 5mA	40% @ 10mA
Current Transfer Ratio (Max)	80% @ 10mA	160% @ 5mA	80% @ 10mA
Maximum Output Voltage	70V	70V	70V
Maximum Output Current	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.35V	1.2V	1.43V
Vce Saturation (Max)	400mV	200mV	300mV
Rise / Fall Time	4µs / 3µs	4µs / 3µs	3µs / 4.7µs
Operating Temperature	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the obsolete FOD617A3SD, the FOD817A3SD is the primary substitute. This part is manufactured by the same supplier (onsemi), maintains identical package and isolation specifications, and carries active product status with ROHS3 compliance certification. The FOD817A3SD demonstrates improved performance characteristics, including lower saturation voltage (200mV vs. 400mV) and higher current transfer ratio at reduced input current (80-160% @ 5mA vs. 40-80% @ 10mA).

The VO615A-1X017T from Vishay Semiconductor Opto Division is a secondary substitute option. This part maintains all critical isolation, package, and temperature specifications. It carries ROHS3 compliance and active product status. The VO615A-1X017T exhibits timing characteristics with slightly faster rise time (3µs vs. 4µs) and marginally slower fall time (4.7µs vs. 3µs) compared to the FOD617A3SD.

Both substitutes are electrically and mechanically compatible with the FOD617A3SD within the defined parameter tolerances for this optoisolator category.

Frequently Asked Questions (FAQ)

Q: Can the FOD817A3SD directly replace the FOD617A3SD in existing designs?

A: Yes. The FOD817A3SD maintains identical isolation voltage (5000Vrms), channel configuration (1 channel), package type (4-SMD, Gull Wing), and operating temperature range (-55°C to 110°C). Pin-to-pin compatibility and functional equivalence are established. The improved saturation voltage and current transfer ratio characteristics of the FOD817A3SD provide enhanced performance margins.

Q: What are the key differences between the FOD817A3SD and VO615A-1X017T?

A: Both parts meet the core substitution criteria. The FOD817A3SD offers lower saturation voltage (200mV vs. 300mV) and higher current transfer ratio at lower input current levels. The VO615A-1X017T provides slightly faster rise time (3µs vs. 4µs). Manufacturer selection depends on supply chain availability and design margin requirements.

Q: Are there packaging differences between these substitutes?

A: All three parts use identical 4-SMD, Gull Wing surface mount packages. The FOD617A3SD and FOD817A3SD are supplied in Cut Tape and Digi-Reel formats. The VO615A-1X017T is supplied in Tape & Reel format. PCB footprint and reflow soldering parameters remain consistent across all three parts.

Q: What compliance certifications apply to these substitutes?

A: The FOD817A3SD and VO615A-1X017T both carry ROHS3 compliance certification. All three parts are REACH Unaffected and classified under ECCN EAR99. Moisture Sensitivity Level is 1 (Unlimited) for all parts, indicating no special moisture handling requirements.

Q: How do the current transfer ratios compare?

A: The FOD617A3SD specifies 40-80% CTR @ 10mA. The FOD817A3SD specifies 80-160% CTR @ 5mA, indicating higher efficiency at lower input current. The VO615A-1X017T matches the FOD617A3SD specification at 40-80% CTR @ 10mA. Circuit designs relying on specific CTR values should account for these variations in bias current and load calculations.

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