TLP781F(F) Equivalent & Substitute Parts

Part Overview

The TLP781F(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. The part is currently listed as obsolete, making identification of functional equivalents essential for ongoing system support and new design implementations. Active substitute parts maintain identical electrical and mechanical specifications while offering continued availability.

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
Package / Case	4-DIP (0.400", 10.16mm)
Operating Temperature	-55°C ~ 110°C
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the TLP781F(F) are classified based on strict electrical and mechanical parameter matching. The substitution criteria are:

Voltage isolation rating: 5000Vrms (mandatory)
Number of channels: 1 (mandatory)
Output type: Transistor (mandatory)
Package type: 4-DIP (0.400", 10.16mm) (mandatory)
Current transfer ratio range: 50% to 600% @ 5mA (mandatory)
Maximum output voltage: 80V (mandatory)
Maximum output current: 50mA per channel (mandatory)
Operating temperature range: -55°C ~ 110°C (mandatory)
Input type: DC (mandatory)

Direct manufacturer substitutes from Toshiba maintain all electrical parameters identically. Parametric equivalents from Everlight Electronics meet all mandatory electrical and mechanical specifications while differing only in non-critical timing characteristics or saturation voltage performance.

Parameter Comparison

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

Engineering Selection Recommendations

All listed substitute parts meet the mandatory electrical and mechanical specifications of the TLP781F(F). Selection should prioritize active product status for long-term availability and supply chain stability.

Toshiba TLP785 series variants (TLP785F(F), TLP785F(D4,F), TLP785F(D4B-F7,F), TLP785F(D4GHF7,F), TLP785F(D4TELS,F)) are direct manufacturer equivalents from the same semiconductor family and represent the primary substitution path. These parts maintain identical electrical performance and are manufactured by the original equipment supplier.

Everlight Electronics EL816 and EL817 series parts (EL816(M), EL816(M)-V, EL817(M)-G, EL817(M)-VG) are parametric equivalents that satisfy all core electrical and mechanical requirements. Everlight parts carry RoHS3 compliance certification. These alternatives provide equivalent functionality with active product status and established supply availability.

Frequently Asked Questions (FAQ)

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

A: Yes. All TLP785F variants listed maintain identical isolation voltage (5000Vrms), current transfer ratio range (50-600% @ 5mA), output specifications (80V maximum, 50mA per channel), and 4-DIP package configuration. The variants differ only in internal manufacturing codes or tape/reel specifications that do not affect electrical performance.

Q: Are Everlight EL816 and EL817 parts compatible with TLP781F(F) applications?

A: Yes. Everlight parts meet all mandatory electrical parameters: 5000Vrms isolation, 50-600% current transfer ratio, 80V maximum output voltage, 50mA output current, and 4-DIP package. These parts are parametric equivalents suitable for direct substitution in circuit designs.

Q: What is the difference between EL816 and EL817 series?

A: Both series meet all core electrical specifications for TLP781F(F) substitution. The EL817 series exhibits different rise and fall time characteristics (6µs rise, 8µs fall) compared to EL816 (4µs rise, 3µs fall), but both remain within acceptable performance parameters for the application class.

Q: Are all substitute parts available in 4-DIP through-hole packaging?

A: Yes. All substitute parts listed are supplied in 4-DIP (0.400", 10.16mm) through-hole package configuration, matching the original TLP781F(F) mechanical specification.

Q: What compliance certifications apply to substitute parts?

A: Toshiba TLP785 series parts carry MSL 1 (Unlimited) moisture sensitivity rating. Everlight EL816 and EL817 series parts carry RoHS3 compliance certification in addition to MSL 1 rating. All parts are classified under ECCN EAR99 and HTSUS 8541.49.8000.

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