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

Part Overview

The TLP781F(D4-Y,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 package for through-hole mounting. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP781F(D4-Y,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)	150% @ 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)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the TLP781F(D4-Y,F) are identified based on strict electrical and mechanical parameter equivalence. The following criteria determine substitutability:

Critical Parameters for Substitution:

Single-channel configuration
5000Vrms isolation voltage
Current Transfer Ratio range: 50% to 150% @ 5mA
Transistor output type
Maximum output voltage: 80V
Maximum output current: 50mA per channel
DC input type
4-DIP through-hole package (0.400", 10.16mm)
Operating temperature range: -55°C to 110°C
Timing specifications: 3µs turn-on/off, 2µs/3µs rise/fall times

All substitute parts listed maintain identical electrical performance and physical form factor, ensuring direct compatibility in existing circuit designs.

Parameter Comparison

Parameter	TLP781F(D4-Y,F)	TLP785F(D4-Y,F)	TLP785F(D4Y-F7,F)	TLP785F(Y,F)
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba
Number of Channels	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	150% @ 5mA	150% @ 5mA	150% @ 5mA	150% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs
Input Type	DC	DC	DC	DC
Output Type	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	60mA	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

The TLP781F(D4-Y,F) is classified as obsolete. Direct substitutes from the TLP785 series are available in active production status, providing continuity for system maintenance and new implementations.

TLP785F(D4-Y,F) is the primary direct manufacturer equivalent, offering identical electrical and mechanical specifications with active product status and higher inventory availability (62,600 units).

TLP785F(D4Y-F7,F) and TLP785F(Y,F) are parametric equivalents with identical performance characteristics and active status. These variants differ only in packaging designations and are suitable for applications requiring the specified electrical performance within the 4-DIP form factor.

All three substitute parts maintain compliance with the same electrical isolation, timing, and thermal specifications as the original TLP781F(D4-Y,F), ensuring functional compatibility in existing circuit designs without modification.

Frequently Asked Questions (FAQ)

Q: Can TLP785F series parts directly replace TLP781F(D4-Y,F) in existing designs?

A: Yes. The TLP785F variants maintain identical electrical specifications including isolation voltage (5000Vrms), current transfer ratio (50-150% @ 5mA), output characteristics (80V max, 50mA max), and timing parameters (3µs turn-on/off, 2µs/3µs rise/fall). The 4-DIP through-hole package is mechanially identical, enabling direct pin-compatible substitution.

Q: What is the difference between TLP785F(D4-Y,F), TLP785F(D4Y-F7,F), and TLP785F(Y,F)?

A: These variants are parametric equivalents with identical electrical performance. Differences exist only in packaging designations and supplier device package codes. All three maintain the same 4-DIP (0.400", 10.16mm) physical form factor and electrical characteristics.

Q: Why is the TLP781F(D4-Y,F) listed as obsolete?

A: The TLP781F(D4-Y,F) has been discontinued by Toshiba Semiconductor and Storage. The TLP785F series provides equivalent functionality and is maintained in active production.

Q: Are there inventory considerations when selecting a substitute?

A: TLP785F(D4-Y,F) has the highest inventory availability at 62,600 units. TLP785F(Y,F) has 1,046 units available, and TLP785F(D4Y-F7,F) has 880 units. Selection may depend on procurement lead time and quantity requirements.

Q: Do all substitute parts operate within the same temperature range?

A: Yes. All substitute parts operate across the identical temperature range of -55°C to 110°C, maintaining performance specifications throughout this range.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message