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

Part Overview

The TLP781F(D4-FUN,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation and is housed in a 4-DIP package for through-hole mounting. The part is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP781F(D4-FUN,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
Turn On / Turn Off Time (Typ)	3µs, 3µs
Rise / Fall Time (Typ)	2µs, 3µs
Input Type	DC
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Voltage - Forward (Vf) (Typ)	1.15V
Current - DC Forward (If) (Max)	60mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 110°C
Mounting Type	Through Hole
Package / Case	4-DIP (0.400", 10.16mm)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the TLP781F(D4-FUN,F) are identified based on the following critical parameters that must remain constant across all alternatives:

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

Substitutes are grouped into two categories: Toshiba TLP785F variants (direct product line evolution) and Everlight EL816/EL817 series (cross-manufacturer equivalents). All listed substitutes maintain identical isolation voltage, package form factor, and electrical output specifications.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min / Max @ 5mA	Turn On/Off Time (Typ)	Rise/Fall Time (Typ)	Vce Sat (Max)	Product Status
TLP781F(D4-FUN,F)	Toshiba	5000Vrms	50% / 600%	3µs, 3µs	2µs, 3µs	400mV	Obsolete
TLP785F(D4,F)	Toshiba	5000Vrms	50% / 600%	3µs, 3µs	2µs, 3µs	400mV	Active
TLP785F(D4B-F7,F)	Toshiba	5000Vrms	50% / 600%	3µs, 3µs	2µs, 3µs	400mV	Active
TLP785F(D4GHF7,F)	Toshiba	5000Vrms	50% / 600%	3µs, 3µs	2µs, 3µs	400mV	Active
TLP785F(D4TELS,F)	Toshiba	5000Vrms	50% / 600%	3µs, 3µs	2µs, 3µs	400mV	Active
TLP785F(F)	Toshiba	5000Vrms	50% / 600%	3µs, 3µs	2µs, 3µs	400mV	Active
EL816(M)	Everlight Electronics	5000Vrms	50% / 600%	—	4µs, 3µs	200mV	Active
EL816(M)-V	Everlight Electronics	5000Vrms	50% / 600%	—	4µs, 3µs	200mV	Active
EL817(M)-G	Everlight Electronics	5000Vrms	50% / 600%	—	6µs, 8µs	200mV	Active
EL817(M)-VG	Everlight Electronics	5000Vrms	50% / 600%	—	6µs, 8µs	200mV	Active

Engineering Selection Recommendations

All Toshiba TLP785F variants listed maintain complete electrical and mechanical compatibility with the obsolete TLP781F(D4-FUN,F). These parts share identical isolation voltage, current transfer ratio specifications, switching times, and package geometry. The TLP785F series represents the active product line continuation and should be the primary selection for direct replacement.

Everlight EL816 and EL817 series optoisolators provide parametric equivalence across all critical isolation and output specifications. The EL816(M) and EL816(M)-V variants demonstrate faster rise/fall times (4µs, 3µs) and lower Vce saturation (200mV) compared to the original TLP781F. The EL817(M)-G and EL817(M)-VG variants exhibit slower switching characteristics (6µs, 8µs rise/fall times) and are suitable for applications where reduced switching speed is acceptable or beneficial.

All substitute parts maintain active product status and comply with RoHS3 requirements where specified. Selection between Toshiba and Everlight alternatives should be based on application-specific timing requirements and thermal performance needs.

Frequently Asked Questions (FAQ)

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

A: Yes. All TLP785F variants listed maintain identical electrical specifications for isolation voltage, current transfer ratio, output voltage, output current, and operating temperature range. The 4-DIP package dimensions are identical, enabling direct board-level substitution without design modification.

Q: What are the differences between Toshiba TLP785F and Everlight EL816/EL817 options?

A: Toshiba TLP785F parts maintain the original switching time specifications (3µs turn-on/off, 2µs/3µs rise/fall). Everlight EL816 variants offer faster rise/fall times (4µs, 3µs) and lower saturation voltage (200mV vs 400mV). Everlight EL817 variants have slower switching characteristics (6µs, 8µs rise/fall). All maintain 5000Vrms isolation and 50-600% current transfer ratio.

Q: Are there compliance or certification differences between substitute options?

A: Everlight EL816 and EL817 series are specified as RoHS3 compliant. Toshiba TLP785F variants do not list explicit RoHS status in the provided specifications. Both manufacturers' parts carry EAR99 export classification and identical HTSUS codes.

Q: Does package form factor remain consistent across all substitutes?

A: Yes. All substitute parts use 4-DIP through-hole packaging with 0.400" (10.16mm) body dimensions. No PCB layout or footprint modifications are required for substitution.

Q: Which substitute should be selected for timing-critical applications?

A: For applications requiring the fastest switching response, Everlight EL816(M) or EL816(M)-V are suitable with 4µs rise time and 3µs fall time. For applications tolerant of slower switching, EL817(M)-G or EL817(M)-VG variants with 6µs rise and 8µs fall times are available. Toshiba TLP785F variants maintain the original 2µs/3µs timing specification.

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