TLP781F(D4-TELS,F) Equivalent & Substitute Parts

Part Overview

The TLP781F(D4-TELS,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 active equivalent and substitute components essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
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

Substitute Part Grouping Explanation

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

Single-channel configuration
5000Vrms isolation voltage
Transistor output topology
50mA maximum output current per channel
80V maximum output voltage
4-DIP through-hole package (0.400", 10.16mm)
DC input type
Operating temperature range -55°C to 110°C
Current transfer ratio range 50% to 600% @ 5mA

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Toshiba TLP785F variants): These parts share identical electrical specifications and package configuration with the main part. Differences exist only in packaging codes and manufacturing date codes, which do not affect functional performance.

Parametric Equivalents (Everlight EL816/EL817 series): These parts meet all critical electrical and mechanical parameters. Minor variations in turn-on/turn-off timing and rise/fall time characteristics are within acceptable tolerance for most applications requiring 5000Vrms isolation with transistor output in 4-DIP configuration.

Parameter Comparison

Part Number	Manufacturer	Product Status	Isolation Voltage	CTR Min @ 5mA	CTR Max @ 5mA	Output Voltage (Max)	Output Current	Package	Temp Range
TLP781F(D4-TELS,F)	Toshiba	Obsolete	5000Vrms	50%	600%	80V	50mA	4-DIP	-55°C ~ 110°C
TLP785F(D4TELS,F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	-55°C ~ 110°C
TLP785F(D4,F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	-55°C ~ 110°C
TLP785F(D4B-F7,F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	-55°C ~ 110°C
TLP785F(D4GHF7,F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	-55°C ~ 110°C
TLP785F(F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	-55°C ~ 110°C
EL816(M)	Everlight Electronics	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	-55°C ~ 110°C
EL816(M)-V	Everlight Electronics	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	-55°C ~ 110°C
EL817(M)-G	Everlight Electronics	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	-55°C ~ 110°C
EL817(M)-VG	Everlight Electronics	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	-55°C ~ 110°C

Engineering Selection Recommendations

Primary Recommendation: The TLP785F series variants (all marked as Active product status) are direct functional replacements for the obsolete TLP781F(D4-TELS,F). These Toshiba components maintain identical electrical specifications and are the preferred choice for designs requiring continuity with the original component lineage.

Secondary Recommendation: Everlight Electronics EL816 and EL817 series optoisolators provide parametric equivalence across all critical isolation, output, and package specifications. These components carry ROHS3 compliance certification and are suitable for applications where multi-source component qualification is acceptable.

Compliance Consideration: All substitute parts listed maintain the same ECCN (EAR99) and HTSUS (8541.49.8000) classifications as the original part. Everlight components provide explicit RoHS3 compliance status, while Toshiba components specify MSL Level 1 (Unlimited) moisture sensitivity.

Frequently Asked Questions (FAQ)

Q: Can I directly replace TLP781F(D4-TELS,F) with any TLP785F variant?

A: Yes. All TLP785F variants listed share identical electrical parameters and 4-DIP package configuration. The differences in part number suffixes (D4TELS, D4, D4B-F7, D4GHF7) reflect manufacturing date codes and packaging specifications that do not affect functional performance.

Q: What is the difference between Toshiba TLP785F and Everlight EL816/EL817 substitutes?

A: Both meet the core electrical requirements: 5000Vrms isolation, 50-600% current transfer ratio, 50mA output current, and 4-DIP package. Everlight components have slightly different timing characteristics (rise/fall times) but remain within acceptable parameters for standard isolation applications. Everlight parts carry explicit RoHS3 compliance certification.

Q: Are there any package compatibility concerns?

A: No. All substitute parts use the standard 4-DIP (0.400", 10.16mm) through-hole package. Pin configuration and footprint are identical, allowing direct PCB substitution without layout modifications.

Q: Why is the original TLP781F(D4-TELS,F) marked as obsolete?

A: The TLP781F has been superseded by the TLP785F series within Toshiba's product portfolio. The TLP785F variants provide equivalent functionality with active manufacturing status and ongoing supply availability.

Q: Can I mix different substitute parts in the same design?

A: Yes. All listed substitutes meet identical electrical specifications for isolation voltage, output current, and operating temperature range. However, maintaining single-source components per design is recommended for supply chain consistency.

Q: What compliance certifications apply to these substitutes?

A: All parts share ECCN EAR99 and HTSUS 8541.49.8000 classifications. Everlight components explicitly state ROHS3 compliance. Toshiba components specify MSL Level 1 (Unlimited) moisture sensitivity, indicating no moisture sensitivity restrictions.

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