TLP781F(D4-GR-FD,F Equivalent & Substitute Parts

Part Overview

The TLP781F(D4-GR-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 through-hole package. 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	Toshiba Semiconductor and Storage
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	100% @ 5mA
Current Transfer Ratio (Max)	300% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Operating Temperature	-55°C ~ 110°C
Package / Case	4-DIP (0.400", 10.16mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TLP781F(D4-GR-FD,F is determined by strict equivalence across the following critical parameters:

Number of Channels: 1
Voltage - Isolation: 5000Vrms
Current Transfer Ratio: 100% (Min) @ 5mA and 300% (Max) @ 5mA
Output Type: Transistor
Voltage - Output (Max): 80V
Current - Output / Channel: 50mA
Package / Case: 4-DIP (0.400", 10.16mm)
Mounting Type: Through Hole
Operating Temperature Range: -55°C ~ 110°C

All identified substitute parts maintain identical electrical and mechanical specifications across these parameters, ensuring direct functional compatibility.

Parameter Comparison

Parameter	TLP781F(D4-GR-FD,F	TLP785F(D4-GR,F	TLP785F(D4GRF7,F	TLP785F(GR,F
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba
Number of Channels	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	100% @ 5mA	100% @ 5mA	100% @ 5mA	100% @ 5mA
Current Transfer Ratio (Max)	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 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
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
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)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable
ECCN	EAR99	EAR99	EAR99	EAR99
HTSUS	8541.49.8000	8541.49.8000	8541.49.8000	8541.49.8000

Engineering Selection Recommendations

All three substitute parts—TLP785F(D4-GR,F, TLP785F(D4GRF7,F, and TLP785F(GR,F—are parametrically equivalent to the obsolete TLP781F(D4-GR-FD,F and provide direct functional replacement.

The TLP785F variants are classified as active products, ensuring ongoing availability and manufacturing support. Selection among the three TLP785F options should be based on packaging and compliance requirements:

TLP785F(D4-GR,F and TLP785F(D4GRF7,F maintain MSL rating of 1 (Unlimited), consistent with the original part. TLP785F(GR,F carries ROHS3 compliance and REACH unaffected status, with MSL listed as Not Applicable. All parts share identical electrical performance and 4-DIP through-hole package specifications.

Frequently Asked Questions (FAQ)

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

A: Yes. All three TLP785F variants maintain identical electrical specifications including isolation voltage, current transfer ratio, output voltage and current ratings, timing characteristics, and operating temperature range. The 4-DIP through-hole package is identical, enabling direct board-level substitution.

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

A: The three variants differ in packaging format and compliance certifications. TLP785F(D4-GR,F and TLP785F(D4GRF7,F are supplied with MSL 1 (Unlimited) rating. TLP785F(GR,F is supplied in tube packaging and carries ROHS3 compliance and REACH unaffected designation. All three maintain identical electrical and mechanical specifications.

Q: Are there any compatibility concerns when substituting these parts?

A: No compatibility concerns exist. All substitute parts are parametrically equivalent across isolation voltage, channel count, output type, current transfer ratio, output voltage and current limits, timing characteristics, and operating temperature range. Through-hole mounting and 4-DIP package dimensions are identical.

Q: Why is the original TLP781F(D4-GR-FD,F classified as obsolete?

A: The TLP781F has been superseded by the TLP785F series, which maintains full electrical and mechanical compatibility while offering active product status and continued manufacturing support.

Q: What should be considered when selecting among the available TLP785F variants?

A: Selection should be based on packaging requirements and compliance certifications. For applications requiring MSL 1 (Unlimited) rating, use TLP785F(D4-GR,F or TLP785F(D4GRF7,F. For applications requiring ROHS3 compliance, use TLP785F(GR,F. All variants are electrically and mechanically identical.

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