TLP781F(D4,F) Equivalent & Substitute Parts

Part Overview

The TLP781F(D4,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage in a 4-DIP through-hole package and is designed for DC input applications requiring galvanic isolation. The part is currently listed as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new designs requiring this isolation specification.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP781F(D4,F)
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Operating Temperature	-55°C ~ 110°C
Package / Case	4-DIP (0.400", 10.16mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TLP781F(D4,F) is determined by strict equivalence across the following critical parameters:

Voltage - Isolation: 5000Vrms
Number of Channels: 1
Output Type: Transistor
Package / Case: 4-DIP (0.400", 10.16mm)
Mounting Type: Through Hole
Current Transfer Ratio range: 50% to 600% @ 5mA
Voltage - Output (Max): 80V
Current - Output / Channel: 50mA
Operating Temperature: -55°C ~ 110°C

Substitute parts are grouped into two categories: direct manufacturer alternatives from Toshiba and parametric equivalents from alternative manufacturers meeting identical electrical and mechanical specifications.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min / Max	Output Voltage (Max)	Output Current	Package	Product Status
TLP781F(D4,F)	Toshiba	5000Vrms	50% / 600%	80V	50mA	4-DIP	Obsolete
TLP785F(D4,F)	Toshiba	5000Vrms	50% / 600%	80V	50mA	4-DIP	Active
TLP785F(D4B-F7,F)	Toshiba	5000Vrms	50% / 600%	80V	50mA	4-DIP	Active
TLP785F(D4GHF7,F)	Toshiba	5000Vrms	50% / 600%	80V	50mA	4-DIP	Active
TLP785F(D4TELS,F)	Toshiba	5000Vrms	50% / 600%	80V	50mA	4-DIP	Active
TLP785F(F)	Toshiba	5000Vrms	50% / 600%	80V	50mA	4-DIP	Active
EL816(M)	Everlight Electronics	5000Vrms	50% / 600%	80V	50mA	4-DIP	Active
EL816(M)-V	Everlight Electronics	5000Vrms	50% / 600%	80V	50mA	4-DIP	Active
EL817(M)-G	Everlight Electronics	5000Vrms	50% / 600%	80V	50mA	4-DIP	Active
EL817(M)-VG	Everlight Electronics	5000Vrms	50% / 600%	80V	50mA	4-DIP	Active

Engineering Selection Recommendations

For applications currently using the obsolete TLP781F(D4,F), the TLP785F series from Toshiba provides direct manufacturer continuity with active product status. All TLP785F variants listed maintain identical electrical specifications and 4-DIP package compatibility, ensuring pin-for-pin replacement capability.

Everlight Electronics EL816 and EL817 series optoisolators meet all parametric requirements and are actively manufactured. The EL816(M) and EL816(M)-V variants provide direct electrical equivalence. The EL817(M)-G and EL817(M)-VG variants also meet all specified parameters and carry RoHS3 compliance certification.

Selection between Toshiba and Everlight alternatives depends on supply chain availability, compliance requirements, and existing qualification status within the application. All listed substitutes are electrically and mechanically interchangeable within the specified parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can TLP785F variants be used as direct replacements for TLP781F(D4,F)?

A: Yes. All TLP785F variants listed maintain identical isolation voltage (5000Vrms), current transfer ratio range (50% to 600% @ 5mA), output voltage rating (80V), output current (50mA), and 4-DIP package configuration. Pin-for-pin replacement is supported.

Q: What is the difference between TLP785F variants with different suffixes?

A: The suffix variations (D4,F), (D4B-F7,F), (D4GHF7,F), (D4TELS,F), and (F) represent different manufacturing codes and tape/reel configurations. All variants maintain identical electrical specifications and are functionally equivalent.

Q: Are Everlight EL816 and EL817 series compatible with TLP781F(D4,F)?

A: Yes. Both EL816 and EL817 series meet all critical electrical parameters: 5000Vrms isolation, 50% to 600% current transfer ratio, 80V maximum output voltage, and 50mA output current. All are packaged in 4-DIP through-hole configuration. Everlight variants carry RoHS3 compliance.

Q: What are the timing differences between substitute parts?

A: Turn-on/turn-off times for TLP785F are specified as 3µs typical for both parameters. Everlight EL816 variants do not specify turn-on/turn-off time. EL817 variants specify rise/fall times of 6µs and 8µs respectively, compared to 2µs and 3µs for TLP785F. These timing differences do not affect functional equivalence for DC input applications within the specified parameter envelope.

Q: Can I use EL817 instead of EL816?

A: Yes. Both EL816 and EL817 series meet all specified electrical and mechanical requirements. Selection between them depends on application timing requirements and supply availability.

Q: Are there any compliance or certification differences?

A: Everlight EL816 and EL817 variants carry RoHS3 compliance certification. Toshiba TLP785F variants specify Moisture Sensitivity Level 1 (Unlimited). All parts carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications.

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