TLP781F(D4-GRL,F,W) Equivalent & Substitute Parts

Part Overview

The TLP781F(D4-GRL,F,W) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation and is designed for DC input applications requiring galvanic isolation in 4-DIP through-hole packages. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.

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)	200% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Operating Temperature	-55°C ~ 110°C
Mounting Type	Through Hole
Package / Case	4-DIP (0.400", 10.16mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the TLP781F(D4-GRL,F,W) is determined by strict equivalence across the following critical parameters:

Single-channel configuration
5000Vrms minimum isolation voltage
Transistor output topology
100% to 200% current transfer ratio @ 5mA
80V maximum output voltage
50mA maximum output current per channel
4-DIP through-hole package (0.400", 10.16mm)
Operating temperature range -55°C to 110°C
DC input type

Substitute parts are grouped into two categories: Toshiba TLP785F variants (same manufacturer, active product status) and cross-manufacturer equivalents (Everlight EL816 and Vishay VO617C series).

Parameter Comparison

Parameter	TLP781F(D4-GRL,F,W)	TLP785F(D4-GRL,F)	TLP785F(GR-LF7,F)	TLP785F(GRL,F)	TLP785F(GRL-F7,F)	EL816(M)(X)	EL816(M)(X)-V	VO617C-3X016
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	Everlight	Everlight	Vishay
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Number of Channels	1	1	1	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5300Vrms
Current Transfer Ratio (Min)	100% @ 5mA	100% @ 5mA	100% @ 5mA	100% @ 5mA	100% @ 5mA	100% @ 5mA	100% @ 5mA	100% @ 5mA
Current Transfer Ratio (Max)	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	Not specified	Not specified	6µs, 4µs
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	4µs, 3µs	4µs, 3µs	3µs, 3µs
Input Type	DC	DC	DC	DC	DC	DC	DC	DC
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V	1.15V	1.2V	1.2V	1.1V
Current - DC Forward (If) (Max)	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV	200mV	200mV	400mV
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-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	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)	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)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	Not specified	Not specified	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the obsolete TLP781F(D4-GRL,F,W), the following substitution strategy applies:

Primary Substitutes (Toshiba TLP785F Series): The TLP785F variants—TLP785F(D4-GRL,F), TLP785F(GR-LF7,F), TLP785F(GRL,F), and TLP785F(GRL-F7,F)—are direct parametric equivalents with active product status. All four variants maintain identical electrical specifications and package configuration. Selection among these variants depends on availability and supplier device package designation. These are the preferred substitutes due to manufacturer continuity and established supply chain support.

Secondary Substitutes (Cross-Manufacturer): The Everlight EL816(M)(X) and EL816(M)(X)-V are parametrically equivalent with the exception of Vce saturation (200mV versus 400mV), which represents improved performance. Both are ROHS3 compliant and maintain active product status. The Vishay VO617C-3X016 offers higher isolation voltage (5300Vrms versus 5000Vrms) and is also ROHS3 compliant with active status. Timing characteristics differ slightly across cross-manufacturer options but remain within functional equivalence for standard isolation applications.

Compliance Consideration: Cross-manufacturer substitutes (Everlight and Vishay) carry ROHS3 compliance certification, while Toshiba TLP785F variants do not specify RoHS status in the provided data. For applications with RoHS compliance requirements, Everlight or Vishay options are appropriate selections.

Frequently Asked Questions (FAQ)

Q: Can TLP785F variants be used as direct replacements for TLP781F(D4-GRL,F,W)?

A: Yes. All TLP785F variants maintain identical electrical parameters, isolation voltage, current transfer ratio, output voltage and current ratings, operating temperature range, and 4-DIP package configuration. The primary difference is product status: TLP781F is obsolete while TLP785F variants are active.

Q: What is the difference between the four TLP785F variants?

A: TLP785F(D4-GRL,F), TLP785F(GR-LF7,F), TLP785F(GRL,F), and TLP785F(GRL-F7,F) are electrically identical. The designations reflect different supplier device package codes and manufacturing lot tracking. Selection is based on availability and supplier inventory.

Q: How does the Everlight EL816 differ from the Toshiba TLP785F?

A: The EL816 is parametrically equivalent with one exception: Vce saturation is 200mV (EL816) versus 400mV (TLP785F). This represents lower saturation voltage, which may improve switching performance in some applications. Both maintain 5000Vrms isolation, identical current transfer ratios, and 4-DIP packaging. The EL816 is ROHS3 compliant.

Q: Why does the Vishay VO617C-3X016 have higher isolation voltage?

A: The VO617C-3X016 specifies 5300Vrms isolation versus 5000Vrms for the TLP781F and TLP785F. This higher rating provides additional isolation margin and is fully compatible with applications designed for 5000Vrms isolation. All other electrical parameters remain equivalent.

Q: Are timing characteristics critical for substitution?

A: Timing differences exist between manufacturers. The TLP781F and TLP785F specify 3µs turn-on/turn-off time and 2µs/3µs rise/fall time. The EL816 specifies 4µs rise time and the VO617C-3X016 specifies 6µs turn-on time. For applications with strict timing requirements, timing specifications must be evaluated against circuit design margins. For standard isolation applications, these variations are typically acceptable.

Q: Which substitute should be selected for new designs?

A: For new designs, select from active product status options: TLP785F variants (Toshiba), EL816 series (Everlight), or VO617C-3X016 (Vishay). If RoHS compliance is required, Everlight or Vishay options are specified as ROHS3 compliant. If manufacturer continuity is preferred, TLP785F variants maintain Toshiba sourcing.

Q: Is the 4-DIP package pinout identical across all substitutes?

A: All substitutes use the 4-DIP (0.400", 10.16mm) through-hole package. Pinout compatibility must be confirmed against specific device datasheets, as optoisolator pin assignments can vary by manufacturer. Physical package dimensions are identical, but electrical pin assignments require datasheet verification.

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