TLP781(D4-GR-SD,F) Equivalent & Substitute Parts

Part Overview

The TLP781(D4-GR-SD,F) is a Toshiba optoisolator with transistor output, rated for 5000Vrms isolation voltage in a 4-DIP through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The TLP781 series provides galvanic isolation for low-speed digital signal transmission in industrial and consumer applications requiring high voltage isolation.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP781(D4-GR-SD,F)
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Product Status	Obsolete
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 (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the TLP781(D4-GR-SD,F) is determined by the following critical parameters:

Isolation Voltage: 5000Vrms (mandatory match)
Number of Channels: 1 channel (mandatory match)
Output Type: Transistor output (mandatory match)
Package / Case: 4-DIP (0.300", 7.62mm) (mandatory match)
Mounting Type: Through Hole (mandatory match)
Current Transfer Ratio Range: 100% to 300% @ 5mA (primary specification)
Maximum Output Voltage: 80V (mandatory match)
Maximum Output Current: 50mA per channel (mandatory match)
Operating Temperature Range: -55°C ~ 110°C (mandatory match)

Substitute parts are grouped into two categories:

Parametric Equivalents (identical electrical specifications): TLP785(D4-GRL,F), TLP785(D4GR-F6,F), and TLP785(GR,F) provide identical current transfer ratio performance (100% to 300% @ 5mA) and all other electrical parameters.

Functional Equivalents (compatible but with broader specifications): TLP785(D4-GR,F) operates within a wider current transfer ratio range (50% to 600% @ 5mA), maintaining all other critical parameters and package compatibility.

Parameter Comparison

Parameter	TLP781(D4-GR-SD,F)	TLP785(D4-GR,F)	TLP785(D4-GRL,F)	TLP785(D4GR-F6,F)	TLP785(GR,F)
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba
Product Status	Obsolete	Active	Active	Active	Active
Number of Channels	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	100% @ 5mA	50% @ 5mA	100% @ 5mA	100% @ 5mA	100% @ 5mA
Current Transfer Ratio (Max)	300% @ 5mA	600% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	60mA	60mA	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C
Package / Case	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	Not specified	RoHS3 Compliant	Not specified	Not specified	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Not Applicable	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalents):

TLP785(D4-GRL,F), TLP785(D4GR-F6,F), and TLP785(GR,F) are parametric equivalents with identical current transfer ratio specifications (100% to 300% @ 5mA). These parts are active products with full availability and are suitable for direct substitution in applications where the original TLP781(D4-GR-SD,F) specifications are required. TLP785(GR,F) carries RoHS Compliant certification.

For Functional Replacement (Broader Specification Range):

TLP785(D4-GR,F) is a functional equivalent with a wider current transfer ratio range (50% to 600% @ 5mA). This part is active and RoHS3 Compliant. It is suitable for applications where the broader CTR range does not create circuit performance issues. The lower minimum CTR (50% vs. 100%) and higher maximum CTR (600% vs. 300%) must be evaluated against circuit design margins.

Availability and Product Status:

All substitute parts are active products with current manufacturing status, ensuring long-term availability compared to the obsolete TLP781(D4-GR-SD,F). Inventory levels vary: TLP785(D4-GRL,F) has the highest stock (47,200 pcs), followed by TLP785(GR,F) (3,099 pcs), TLP785(D4-GR,F) (947 pcs), and TLP785(D4GR-F6,F) (1,079 pcs).

Frequently Asked Questions (FAQ)

Q: Can TLP785(D4-GR,F) be used as a direct replacement for TLP781(D4-GR-SD,F)?

A: TLP785(D4-GR,F) is functionally compatible but has a broader current transfer ratio range (50% to 600% @ 5mA) compared to the TLP781 specification (100% to 300% @ 5mA). It maintains all other electrical and package parameters. Circuit design margins must accommodate the wider CTR range.

Q: What is the difference between the TLP785 variants?

A: TLP785(D4-GRL,F), TLP785(D4GR-F6,F), and TLP785(GR,F) are parametric equivalents with identical specifications (100% to 300% @ 5mA CTR). Differences are in packaging format (tube vs. standard) and RoHS certification status. TLP785(D4-GR,F) differs by having a wider CTR range (50% to 600% @ 5mA).

Q: Are all substitute parts pin-compatible with the original TLP781(D4-GR-SD,F)?

A: Yes. All substitute parts use the same 4-DIP (0.300", 7.62mm) package with through-hole mounting, ensuring mechanical and electrical pin compatibility.

Q: Which substitute part has the best availability?

A: TLP785(D4-GRL,F) has the highest inventory level at 47,200 pcs, making it the most readily available option for volume production.

Q: Do the substitute parts meet RoHS requirements?

A: TLP785(D4-GR,F) is RoHS3 Compliant. TLP785(GR,F) is RoHS Compliant. RoHS status for TLP785(D4-GRL,F) and TLP785(D4GR-F6,F) is not specified in the provided data.

Q: What is the operating temperature range for all parts?

A: All parts, including the original TLP781(D4-GR-SD,F) and all substitutes, operate across -55°C to 110°C.

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