TLP781F Optoisolator Equivalent & Substitute Parts

Part Overview

The TLP781F is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation and is designed for DC input applications requiring galvanic isolation in 4-SMD surface mount packages. The TLP781F is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Active alternatives from Toshiba and other manufacturers maintain identical electrical and mechanical specifications while offering current product status and improved availability.

Key Parameters

Parameter	Value
Voltage - Isolation	5000Vrms
Number of Channels	1
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 110°C
Package / Case	4-SMD, Gull Wing
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the TLP781F are grouped based on strict electrical and mechanical parameter equivalence. All listed substitutes maintain the following critical specifications:

Isolation voltage: 5000Vrms
Single channel configuration
Transistor output topology
Current transfer ratio range: 50% to 600% @ 5mA
Maximum output voltage: 80V
Maximum output current: 50mA
Operating temperature range: -55°C to 110°C
Package configuration: 4-SMD, Gull Wing surface mount

Substitutes are classified into two categories: Toshiba TLP785 series variants (same manufacturer, active product status) and Everlight EL816 series variants (alternative manufacturer, active product status). Both categories meet all specified electrical parameters and mechanical compatibility requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Isolation (Vrms)	CTR Min @ 5mA	CTR Max @ 5mA	Vce Sat (Max)	Vf (Typ)	If (Max)	Temp Range	Package	Inventory
TLP781F(ABB-TP7,F)	Toshiba	Obsolete	5000	50%	600%	400mV	1.15V	60mA	-55 to 110°C	4-SMD	33498
TLP785F(TP7,F)	Toshiba	Active	5000	50%	600%	400mV	1.15V	60mA	-55 to 110°C	4-SMD	828
TLP785(D4-TP6,F)	Toshiba	Active	5000	50%	600%	400mV	1.15V	60mA	-55 to 110°C	4-SMD	1161
TLP785(D4GH-T6,F)	Toshiba	Active	5000	50%	600%	400mV	1.15V	60mA	-55 to 110°C	4-SMD	5006
TLP785(D4GL-T6,F)	Toshiba	Active	5000	50%	600%	400mV	1.15V	60mA	-55 to 110°C	4-SMD	4710
TLP785(TP6,F)	Toshiba	Active	5000	50%	600%	400mV	1.15V	60mA	-55 to 110°C	4-SMD	7400
TLP785F(D4-TP7,F)	Toshiba	Active	5000	50%	600%	400mV	1.15V	60mA	-55 to 110°C	4-SMD	992
EL816(S)(TD)	Everlight	Active	5000	50%	600%	200mV	1.2V	60mA	-55 to 110°C	4-SMD	882
EL816(S)(TD)-V	Everlight	Active	5000	50%	600%	200mV	1.2V	60mA	-55 to 110°C	4-SMD	828
EL816(S)(TU)-V	Everlight	Active	5000	50%	600%	200mV	1.2V	60mA	-55 to 110°C	4-SMD	674
EL816(S1)(TD)	Everlight	Active	5000	50%	600%	200mV	1.2V	60mA	-55 to 110°C	4-SMD	651

Engineering Selection Recommendations

All listed Toshiba TLP785 variants are direct functional equivalents with identical electrical specifications and active product status. These parts are recommended as primary substitutes due to manufacturer continuity and established supply chain presence.

Everlight EL816 series variants provide functional equivalence with minor electrical differences: Vce saturation is reduced to 200mV maximum (compared to 400mV for TLP781F and TLP785 series) and forward voltage is slightly elevated to 1.2V typical (compared to 1.15V). These differences remain within acceptable operating margins for most applications. EL816 variants carry ROHS3 compliance certification, providing additional environmental qualification for regulated applications.

For new designs and production continuity, TLP785(D4GH-T6,F) and TLP785(D4GL-T6,F) offer the highest inventory levels (5006 and 4710 units respectively) with RoHS compliance and active product status. These variants are packaged in Tape & Reel format, supporting automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can TLP785 series parts directly replace TLP781F without circuit modification?

A: Yes. All TLP785 variants maintain identical electrical specifications for isolation voltage, current transfer ratio, output voltage, output current, and operating temperature range. The 4-SMD Gull Wing package is mechanically compatible with existing PCB layouts designed for TLP781F.

Q: What is the difference between TLP785 variants with different suffixes (TP6, TP7, D4-TP6, D4-TP7, D4GL-T6, D4GH-T6)?

A: The suffixes indicate packaging and tape configuration variants. All variants maintain identical electrical specifications. Selection should be based on assembly process requirements: standard packaging for manual or selective assembly, or Tape & Reel format for high-volume automated processes.

Q: Are Everlight EL816 parts suitable replacements for TLP781F?

A: EL816 variants are electrically compatible with lower Vce saturation (200mV vs 400mV) and slightly higher forward voltage (1.2V vs 1.15V). These differences are within normal operating tolerances. EL816 parts are recommended where RoHS3 compliance is required or where reduced saturation voltage provides circuit performance benefits.

Q: What packaging format should be selected for high-volume production?

A: TLP785(D4GH-T6,F) and TLP785(D4GL-T6,F) are supplied in Tape & Reel format, optimized for automated pick-and-place assembly. Standard packaging variants (TP6, TP7) are suitable for lower-volume or manual assembly processes.

Q: Is MSL (Moisture Sensitivity Level) a consideration when selecting substitutes?

A: TLP785 variants specify MSL 1 (Unlimited) or Not Applicable, indicating minimal moisture sensitivity. EL816 variants specify MSL 1 (Unlimited). All parts are suitable for standard storage and handling conditions without special moisture control requirements.

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