OPIA817DTUE Equivalent & Substitute Parts

Part Overview

The OPIA817DTUE is a 5000Vrms optoisolator with transistor output manufactured by TT Electronics/Optek Technology in a 4-DIP through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The part delivers single-channel isolation with 50mA output current capability and operates across the -30°C to 100°C temperature range. Active alternatives from current manufacturers provide enhanced specifications and improved availability while maintaining core electrical compatibility.

Key Parameters

Parameter	Value
Isolation Voltage	5000Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Maximum Output Voltage	60V
Output Current per Channel	50mA
Rise / Fall Time	4µs, 3µs
Vce Saturation (Max)	200mV
Operating Temperature	-30°C to 100°C
Package Type	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following core parameters:

Isolation Voltage: All substitutes maintain 5000Vrms isolation, meeting the primary safety requirement
Output Type: All substitutes use transistor output configuration
Number of Channels: All substitutes provide single-channel operation
Output Current: All substitutes support 50mA per channel
Vce Saturation: All substitutes maintain 200mV maximum saturation voltage
Rise / Fall Time: All substitutes match 4µs rise and 3µs fall time specifications
Input Type: All substitutes accept DC input

Substitutes are grouped into two categories based on mounting type:

Through-Hole Substitutes (Direct package replacement): FOD817A maintains the 4-DIP through-hole package, enabling direct socket compatibility with the OPIA817DTUE.

Surface-Mount Substitutes (Functional equivalents): FOD8173S, FOD8173SD, FOD817A3S, FOD817A3SD, FOD817AS, FOD817ASD, FOD817B3S, FOD817B3SD, and FOD817BS use 4-SMD gull-wing packages. These provide electrical equivalence but require PCB layout redesign.

Parameter Comparison

Parameter	OPIA817DTUE	FOD817A	FOD8173S / FOD8173SD	FOD817A3S / FOD817A3SD / FOD817AS / FOD817ASD	FOD817B3S / FOD817B3SD / FOD817BS
Manufacturer	TT Electronics/Optek	onsemi	Fairchild Semiconductor	onsemi	onsemi
Product Status	Obsolete	Active	Active	Active	Active
Isolation Voltage	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1	1	1
Current Transfer Ratio (Min)	50% @ 5mA	80% @ 5mA	50% @ 5mA	80% @ 5mA	130% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	160% @ 5mA	600% @ 5mA	160% @ 5mA	260% @ 5mA
Maximum Output Voltage	60V	70V	70V	70V	70V
Output Current per Channel	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	200mV	200mV	200mV	200mV	200mV
Rise / Fall Time	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
Operating Temperature	-30°C to 100°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C
Package / Case	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Mounting Type	Through Hole	Through Hole	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Direct Socket Replacement: FOD817A from onsemi is the primary substitute for through-hole applications. It maintains the 4-DIP package footprint, enabling direct installation without PCB redesign. FOD817A carries active product status with ROHS3 compliance and REACH unaffected certification, matching the regulatory profile of the obsolete OPIA817DTUE.

For Surface-Mount Designs: FOD8173S and FOD8173SD from Fairchild Semiconductor preserve the original current transfer ratio range (50% to 600% @ 5mA), providing the closest electrical match to the OPIA817DTUE for new PCB layouts. Both variants are active products with REACH unaffected status.

For Enhanced Current Transfer Ratio: onsemi FOD817A3S, FOD817A3SD, FOD817AS, and FOD817ASD variants offer improved minimum current transfer ratio (80% @ 5mA) compared to the original part, with active product status and full compliance certifications. FOD817B3S, FOD817B3SD, and FOD817BS provide the highest current transfer ratio (130% to 260% @ 5mA) for applications requiring maximum optical coupling efficiency.

All active substitutes extend the operating temperature range to -55°C to 110°C and increase maximum output voltage to 70V, providing enhanced performance margins over the original specification.

Frequently Asked Questions (FAQ)

Q: Can FOD817A replace OPIA817DTUE in existing circuit boards?

A: Yes. FOD817A maintains identical 4-DIP through-hole package dimensions (0.300", 7.62mm) and pin configuration, enabling direct socket substitution without PCB modification. Electrical parameters including isolation voltage, output current, and switching times are compatible.

Q: What is the difference between FOD8173S and FOD8173SD?

A: Both parts are functionally identical 4-SMD surface-mount optoisolators with 5000Vrms isolation. The primary difference is packaging format: FOD8173S is supplied in bulk, while FOD8173SD is supplied in cut tape and digi-reel format. Electrical specifications are identical.

Q: Why do onsemi FOD817A variants show higher current transfer ratio than the original OPIA817DTUE?

A: The FOD817A series (80% to 160% @ 5mA) and FOD817B series (130% to 260% @ 5mA) represent improved manufacturing processes from onsemi. Higher current transfer ratio indicates more efficient optical coupling, which is a performance enhancement. Circuits designed for the original 50% to 600% range will operate within specification with these substitutes.

Q: Are surface-mount substitutes electrically compatible with through-hole designs?

A: Surface-mount substitutes (FOD8173S, FOD817A3S, FOD817B3S, etc.) are electrically equivalent but require PCB redesign due to different package footprints. Direct socket replacement is not possible. Use FOD817A for through-hole applications.

Q: Do all substitutes meet the same regulatory requirements as OPIA817DTUE?

A: All active substitutes maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original part. Fairchild FOD8173S and FOD8173SD do not specify RoHS status in available documentation.

Q: What is the temperature operating range difference between OPIA817DTUE and its substitutes?

A: OPIA817DTUE operates from -30°C to 100°C. All active substitutes extend this range to -55°C to 110°C, providing wider temperature margin for industrial and automotive applications.

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