TLP781(D4-FUN,F) Equivalent & Substitute Parts

Part Overview

The TLP781(D4-FUN,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage and is housed in a 4-DIP through-hole package. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production continuity. Active alternatives with identical electrical and mechanical specifications are available from both Toshiba and alternative manufacturers.

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 (0.300", 7.62mm)
Mounting Type	Through Hole
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the TLP781(D4-FUN,F) is determined by strict equivalence across the following critical parameters:

Voltage - Isolation: 5000Vrms
Number of Channels: 1
Output Type: Transistor
Current Transfer Ratio range: 50% to 600% @ 5mA
Voltage - Output (Max): 80V
Current - Output / Channel: 50mA
Package / Case: 4-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Operating Temperature: -55°C ~ 110°C

Substitute parts are grouped into two categories: Toshiba TLP785 series variants (all active status) and the Everlight EL816 (active status). All listed substitutes maintain identical isolation voltage, channel count, output type, current ratings, and package specifications. The primary distinction between substitutes is product status (active vs. obsolete) and packaging format variations.

Parameter Comparison

Part Number	Manufacturer	Product Status	Isolation Voltage	CTR Min @ 5mA	CTR Max @ 5mA	Output Voltage (Max)	Output Current	Package	Inventory
TLP781(D4-FUN,F)	Toshiba	Obsolete	5000Vrms	50%	600%	80V	50mA	4-DIP	871 Pcs
TLP785(D4,F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	754 Pcs
TLP785	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	39200 Pcs
TLP785(D4-LF6,F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	1134 Pcs
TLP785(D4B-F6,F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	759 Pcs
TLP785(D4GH-F6,F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	1004 Pcs
TLP785(D4GL-F6,F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	1080 Pcs
TLP785(F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	2332 Pcs
TLP785(LF6,F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	1157 Pcs
TLP785(TELS,F)	Toshiba	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	3400 Pcs
EL816	Everlight Electronics Co Ltd	Active	5000Vrms	50%	600%	80V	50mA	4-DIP	2400 Pcs

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the TLP781(D4-FUN,F). Selection should prioritize active-status components to ensure long-term availability and supply chain continuity.

Toshiba TLP785 variants are direct parametric equivalents with identical isolation voltage, current transfer ratio specifications, and package dimensions. The base TLP785 part number offers the highest inventory level (39200 pcs), providing optimal supply security. Variants with suffixes such as (D4,F), (D4-LF6,F), (D4B-F6,F), (D4GH-F6,F), (D4GL-F6,F), (LF6,F), and (TELS,F) represent packaging or lead-form variations while maintaining identical electrical performance.

The Everlight EL816 provides an alternative from a different manufacturer with equivalent isolation voltage, output type, and package specifications. Minor variations exist in rise/fall time (4µs, 3µs vs. 2µs, 3µs) and Vce saturation (200mV vs. 400mV), which remain within acceptable operating margins for most applications.

All substitutes carry MSL rating of 1 (Unlimited) and comply with ECCN EAR99 and HTSUS 8541.49.8000 classifications. The TLP785(F) variant carries ROHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can TLP785 variants be used as direct replacements for TLP781(D4-FUN,F)?

A: Yes. All TLP785 variants listed maintain identical isolation voltage (5000Vrms), current transfer ratio specifications (50% to 600% @ 5mA), output voltage (80V max), output current (50mA), and 4-DIP package dimensions. Electrical performance is equivalent across all parameters provided in the specification.

Q: What is the difference between TLP785 variants with different suffixes?

A: Suffix variations (D4, D4-LF6, D4B-F6, D4GH-F6, D4GL-F6, LF6, TELS) indicate packaging format, lead material, or tape-and-reel configurations. All variants maintain identical electrical specifications and 4-DIP through-hole package dimensions (0.300", 7.62mm).

Q: Is the Everlight EL816 fully compatible with TLP781(D4-FUN,F)?

A: The EL816 is parametrically equivalent in isolation voltage, channel count, output type, voltage/current ratings, and package specification. Minor timing differences exist: EL816 rise/fall time is 4µs/3µs versus TLP781 2µs/3µs, and Vce saturation is 200mV versus 400mV. These variations remain within acceptable operating margins for standard optoisolator applications.

Q: Why is TLP781(D4-FUN,F) marked as obsolete?

A: The TLP781(D4-FUN,F) has been discontinued by Toshiba. Active TLP785 series variants provide equivalent functionality and are recommended for new designs and production continuity.

Q: Which substitute offers the best supply availability?

A: The base TLP785 part number carries the highest inventory (39200 pcs), followed by TLP785(TELS,F) with 3400 pcs. Both are active-status components suitable for immediate procurement.

Q: Are all substitutes through-hole mounted?

A: Yes. All listed substitutes use through-hole mounting with 4-DIP package configuration (0.300", 7.62mm), maintaining identical PCB footprint compatibility with the original TLP781(D4-FUN,F).

Q: Do substitute parts require any circuit modifications?

A: No circuit modifications are required. All substitutes maintain identical electrical specifications for isolation voltage, current transfer ratio, output voltage, output current, and operating temperature range. Direct pin-for-pin replacement is supported.

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