OPIA817ATRE Optoisolator Equivalent & Substitute Parts

Part Overview

The OPIA817ATRE is a 5000Vrms isolation optoisolator with transistor output manufactured by TT Electronics/Optek Technology in 4-SMD surface mount packaging. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The part delivers single-channel isolation with 50mA output current capability and operates across the -30°C to 100°C temperature range.

Key Parameters

Parameter	Value
Manufacturer Part Number	OPIA817ATRE
Manufacturer	TT Electronics/Optek Technology
Category	Optoisolators
Product Status	Obsolete
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Rise / Fall Time (Typ)	4µs, 3µs
Input Type	DC
Output Type	Transistor
Voltage - Output (Max)	60V
Current - Output / Channel	50mA
Voltage - Forward (Vf) (Typ)	1.2V
Current - DC Forward (If) (Max)	50mA
Vce Saturation (Max)	200mV
Operating Temperature	-30°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the OPIA817ATRE is determined by the following critical parameters that must remain constant across all equivalent parts:

Voltage isolation rating: 5000Vrms
Output type: Transistor
Number of channels: 1
Mounting type: Surface Mount
Package type: 4-SMD, Gull Wing
Input type: DC
Output current capability: 50mA minimum
Maximum output voltage: 60V minimum
Vce saturation: 200mV maximum
Rise/Fall time: 4µs / 3µs typical

Substitute parts are grouped by current transfer ratio (CTR) performance bands, which define the input-to-output signal transfer characteristics. The OPIA817ATRE operates in the 50%-600% CTR range. Active substitute parts from Fairchild Semiconductor and onsemi maintain the same isolation voltage, output current, and package specifications while offering improved product status and extended temperature operating ranges.

Parameter Comparison

Parameter	OPIA817ATRE	FOD8173S	FOD8173SD	FOD817A3S	FOD817A3SD	FOD817AS	FOD817ASD	FOD817B3S	FOD817B3SD	FOD817BS	FOD817BSD
Manufacturer	TT Electronics/Optek	Fairchild Semiconductor	Fairchild Semiconductor	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	80% @ 5mA	80% @ 5mA	80% @ 5mA	80% @ 5mA	130% @ 5mA	130% @ 5mA	130% @ 5mA	130% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	160% @ 5mA	160% @ 5mA	160% @ 5mA	160% @ 5mA	260% @ 5mA	260% @ 5mA	260% @ 5mA	260% @ 5mA
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
Input Type	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	60V	70V	70V	70V	70V	70V	70V	70V	70V	70V	70V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV
Operating Temperature	-30°C ~ 100°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	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	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Not specified	Not specified	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All listed substitute parts maintain the critical electrical and mechanical specifications required for direct replacement of the OPIA817ATRE. The primary distinction between substitute options is current transfer ratio performance band and product status.

Fairchild Semiconductor FOD8173 Series (FOD8173S, FOD8173SD): These parts operate in the 50%-600% CTR range, matching the original OPIA817ATRE specification exactly. Both variants are active products with extended operating temperature range (-55°C to 110°C). FOD8173SD offers higher inventory availability (38,298 units) in Cut Tape & Digi-Reel packaging.

onsemi FOD817A Series (FOD817A3S, FOD817A3SD, FOD817AS, FOD817ASD): These parts operate in the 80%-160% CTR range with active product status and extended temperature range. FOD817A3SD provides the highest inventory level (108,100 units) in Cut Tape & Digi-Reel packaging. All onsemi FOD817A variants are ROHS3 compliant with MSL 1 rating.

onsemi FOD817B Series (FOD817B3S, FOD817B3SD, FOD817BS, FOD817BSD): These parts operate in the 130%-260% CTR range with active product status and extended temperature range. FOD817B3SD offers 22,400 units in Tape & Reel packaging. All onsemi FOD817B variants are ROHS3 compliant with MSL 1 rating.

All substitute parts exceed the original OPIA817ATRE maximum output voltage specification (70V vs. 60V) and provide wider operating temperature ranges, making them suitable for applications requiring enhanced thermal performance.

Frequently Asked Questions (FAQ)

Q: Can FOD8173S and FOD8173SD be used interchangeably with OPIA817ATRE?

A: Yes. Both parts maintain identical electrical specifications including 5000Vrms isolation, 50%-600% CTR range, 50mA output current, and 4-SMD Gull Wing packaging. The primary difference is packaging format: FOD8173S is supplied in Bulk, while FOD8173SD is supplied in Cut Tape & Digi-Reel format.

Q: What is the difference between onsemi FOD817A and FOD817B series?

A: The primary difference is current transfer ratio performance. FOD817A operates at 80%-160% CTR, while FOD817B operates at 130%-260% CTR. Both maintain identical isolation voltage, output current, and package specifications. Selection depends on circuit requirements for input-to-output signal transfer characteristics.

Q: Are the onsemi FOD817 variants available in different packaging options?

A: Yes. onsemi FOD817 parts are available in multiple packaging formats: Tube (S suffix), Cut Tape & Digi-Reel (SD suffix), and Tape & Reel (TR suffix for FOD817B3SD). Packaging selection affects inventory availability and handling requirements but does not alter electrical performance.

Q: Does the extended operating temperature range of substitute parts affect circuit design?

A: No. The extended temperature range (-55°C to 110°C vs. -30°C to 100°C) represents an improvement over the original OPIA817ATRE specification. Circuits designed for the original temperature range will operate within the substitute part specifications without modification.

Q: Are all substitute parts RoHS compliant?

A: onsemi FOD817 series parts are ROHS3 compliant. Fairchild Semiconductor FOD8173 series RoHS status is not specified in the provided data. Verify RoHS compliance requirements with component suppliers for specific applications.

Q: What is the significance of MSL 1 rating on substitute parts?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life without moisture control requirements. This matches the original OPIA817ATRE specification and simplifies component storage and handling procedures.

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