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

Part Overview

The TLP781F(D4-Y-FD,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 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-FD,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-FD,F) are identified based on strict parametric equivalence across the following critical specifications:

Isolation Voltage: 5000Vrms (primary isolation requirement)

Channel Configuration: Single channel (1 channel)

Output Architecture: Transistor output with identical electrical characteristics

Current Transfer Ratio: 50% minimum and 150% maximum @ 5mA (gain specification)

Switching Performance: 3µs turn-on/turn-off time and 2µs/3µs rise/fall time

Output Ratings: 80V maximum output voltage and 50mA per-channel current capacity

Package Form Factor: 4-DIP through-hole mounting (0.400", 10.16mm)

Operating Range: -55°C to 110°C temperature specification

All substitute parts listed maintain identical electrical performance across these parameters, ensuring direct functional replacement in existing circuit designs.

Parameter Comparison

Parameter	TLP781F(D4-Y-FD,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-FD,F) is classified as obsolete. All three substitute parts—TLP785F(D4-Y,F), TLP785F(D4Y-F7,F), and TLP785F(Y,F)—are active products from Toshiba Semiconductor and Storage and maintain complete parametric equivalence with the original component.

For new designs or system replacements, selection among the three active TLP785F variants should be based on current inventory availability and supplier lead times. All three variants are functionally interchangeable with the obsolete TLP781F(D4-Y-FD,F) across all specified electrical and mechanical parameters.

Both the original part and all substitutes carry identical compliance certifications: ECCN EAR99 and HTSUS 8541.49.8000.

Frequently Asked Questions (FAQ)

Q: Can TLP785F variants directly replace the TLP781F(D4-Y-FD,F) in existing designs?

A: Yes. All three TLP785F variants maintain identical electrical specifications, switching characteristics, isolation voltage, output ratings, and package form factor. Direct pin-for-pin replacement is supported without circuit modification.

Q: What is the difference between the three TLP785F part numbers?

A: The three TLP785F variants—TLP785F(D4-Y,F), TLP785F(D4Y-F7,F), and TLP785F(Y,F)—are parametrically equivalent. Differences exist only in packaging designations and manufacturing date codes. All three are functionally identical for circuit applications.

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

A: Product obsolescence is determined by the manufacturer. The TLP785F series represents the current active product line from Toshiba for this optoisolator category and should be used for all new designs and replacements.

Q: Are there any thermal or reliability differences between the original and substitute parts?

A: No. All parts share identical operating temperature range (-55°C to 110°C) and moisture sensitivity level (MSL 1 - Unlimited). Thermal and reliability characteristics are equivalent.

Q: What inventory levels are available for the substitute parts?

A: TLP785F(D4-Y,F) has 62,600 units in stock. TLP785F(D4Y-F7,F) has 880 units in stock. TLP785F(Y,F) has 1,046 units in stock. All are new original components.

Q: Is the 4-DIP through-hole package identical across all parts?

A: Yes. All parts use the same 4-DIP package with 0.400" (10.16mm) spacing, ensuring mechanical compatibility in existing PCB layouts.

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