FOD816S Equivalent & Substitute Parts

Part Overview

The FOD816S is a 5000Vrms isolation optoisolator with Darlington output manufactured by onsemi in a 4-SMD surface mount package. This component provides galvanic isolation for single-channel applications requiring high voltage isolation and AC/DC input capability. The FOD816S is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Direct functional equivalents are available from Lite-On Inc. under the LTV-8141 series, which maintain identical electrical and mechanical specifications while offering active product status.

Key Parameters

Parameter	Value
Voltage - Isolation	5000Vrms
Number of Channels	1
Output Type	Darlington
Current Transfer Ratio (Min)	600% @ 1mA
Current Transfer Ratio (Max)	7500% @ 1mA
Voltage - Output (Max)	35V
Current - Output / Channel	80mA
Rise / Fall Time (Typ)	60µs, 53µs
Input Type	AC, DC
Vce Saturation (Max)	1V
Operating Temperature	-30°C ~ 100°C
Package / Case	4-SMD, Gull Wing
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the FOD816S is determined by strict equivalence across all critical electrical and mechanical parameters. The allowed substitution criteria are:

Voltage isolation rating: 5000Vrms (exact match required)
Number of channels: 1 (exact match required)
Output configuration: Darlington (exact match required)
Current transfer ratio range: 600% to 7500% @ 1mA (exact match required)
Maximum output voltage: 35V (exact match required)
Output current per channel: 80mA (exact match required)
Rise and fall times: 60µs and 53µs (exact match required)
Input type: AC, DC (exact match required)
Vce saturation: 1V maximum (exact match required)
Operating temperature range: -30°C to 100°C (exact match required)
Package type: 4-SMD, Gull Wing surface mount (exact match required)
Moisture sensitivity level: 1 (Unlimited) (exact match required)

All three substitute parts (LTV-8141S, LTV-8141S-TA, LTV-8141S-TA1) meet these criteria. The differences among substitutes are limited to packaging format (Tube versus Tape & Reel) and product status (Active versus Obsolete).

Parameter Comparison

Parameter	FOD816S (onsemi)	LTV-8141S (Lite-On)	LTV-8141S-TA (Lite-On)	LTV-8141S-TA1 (Lite-On)
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1	1
Output Type	Darlington	Darlington	Darlington	Darlington
Current Transfer Ratio (Min)	600% @ 1mA	600% @ 1mA	600% @ 1mA	600% @ 1mA
Current Transfer Ratio (Max)	7500% @ 1mA	7500% @ 1mA	7500% @ 1mA	7500% @ 1mA
Voltage - Output (Max)	35V	35V	35V	35V
Current - Output / Channel	80mA	80mA	80mA	80mA
Rise / Fall Time (Typ)	60µs, 53µs	60µs, 53µs	60µs, 53µs	60µs, 53µs
Input Type	AC, DC	AC, DC	AC, DC	AC, DC
Vce Saturation (Max)	1V	1V	1V	1V
Operating Temperature	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active
Packaging Format	Not specified	Tube	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The FOD816S is obsolete and no longer in active production. All three LTV-8141 series variants from Lite-On Inc. are direct functional equivalents with active product status, ensuring long-term availability and supply chain continuity.

Selection among the three substitute options depends on procurement and assembly requirements:

LTV-8141S is supplied in Tube packaging and is suitable for lower-volume applications or manual assembly processes.

LTV-8141S-TA is supplied in Tape & Reel format and is appropriate for automated pick-and-place assembly with standard reel specifications.

LTV-8141S-TA1 is supplied in Tape & Reel format with the highest available inventory (45,342 pcs), providing optimal lead time and cost efficiency for high-volume production.

All three substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements. The FOD816S compliance status for RoHS was not specified in the original documentation.

Frequently Asked Questions (FAQ)

Q: Can LTV-8141S, LTV-8141S-TA, and LTV-8141S-TA1 be used interchangeably with FOD816S?

A: Yes. All three parts are electrically and mechanically identical to the FOD816S. The differences are limited to packaging format (Tube versus Tape & Reel) and inventory availability. Selection should be based on assembly process requirements and supply chain needs.

Q: What is the difference between LTV-8141S-TA and LTV-8141S-TA1?

A: Both are supplied in Tape & Reel format with identical electrical and mechanical specifications. The primary difference is inventory availability: LTV-8141S-TA1 has significantly higher stock (45,342 pcs versus 1,117 pcs), making it preferable for high-volume production or applications requiring extended lead time assurance.

Q: Are the substitute parts compatible with existing PCB designs for FOD816S?

A: Yes. The LTV-8141 series maintains the same 4-SMD Gull Wing package and pinout as the FOD816S, ensuring direct compatibility with existing PCB layouts and assembly processes without design modifications.

Q: What compliance certifications apply to the substitute parts?

A: The LTV-8141S, LTV-8141S-TA, and LTV-8141S-TA1 are ROHS3 compliant. All parts are REACH unaffected and classified under ECCN EAR99 with HTSUS code 8541.49.8000.

Q: Why is the FOD816S obsolete?

A: The FOD816S has been discontinued by onsemi. The LTV-8141 series from Lite-On Inc. provides equivalent functionality with active product status and ongoing manufacturer support.

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