TLP781F(GRL,F) Equivalent & Substitute Parts

Part Overview

The TLP781F(GRL,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage in a 4-DIP through-hole package and is designed for DC input applications requiring galvanic isolation. The part is currently listed as obsolete, making identification of active equivalent and substitute components essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP781F(GRL,F)
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
Package / Case	4-DIP (0.400", 10.16mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the TLP781F(GRL,F) are classified based on strict parametric equivalence across the following critical criteria:

Direct Manufacturer Equivalents (Toshiba TLP785F variants): Parts sharing identical electrical specifications with the main component, including 5000Vrms isolation voltage, 100-200% current transfer ratio at 5mA, 80V maximum output voltage, and 50mA output current per channel. These variants differ only in packaging designations (GRL,F; D4-GRL,F; GR-LF7,F; GRL-F7,F) and represent active product status alternatives from the same manufacturer.

Parametric Equivalents (Everlight EL816 series): Parts meeting all primary electrical specifications including 5000Vrms isolation, matching current transfer ratios, output voltage and current ratings, and identical package form factor. Minor variations in Vce saturation (200mV vs 400mV) and rise/fall time characteristics remain within functional tolerance for standard isolation applications.

Parametric Equivalents (Vishay VO617C-3X016): Part exceeding isolation voltage specification at 5300Vrms while maintaining all other electrical parameters including current transfer ratio, output voltage/current ratings, and package compatibility. This component was listed as a substitute option in the original part documentation.

All substitute relationships are based on matching the following key parameters: single-channel configuration, 5000Vrms minimum isolation voltage, 100-200% current transfer ratio at 5mA input, 80V maximum output voltage, 50mA output current capability, transistor output type, DC input type, 4-DIP through-hole package, and -55°C to 110°C operating temperature range.

Parameter Comparison

Parameter	TLP781F(GRL,F)	TLP785F(GRL,F)	TLP785F(D4-GRL,F)	TLP785F(GR-LF7,F)	TLP785F(GRL-F7,F)	EL816(M)(X)	EL816(M)(X)-V	VO617C-3X016
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	Everlight	Everlight	Vishay
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	—	—	6µs, 4µs
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	4µs, 3µs	4µs, 3µs	3µs, 3µs
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
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)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Toshiba TLP785F variants (GRL,F; D4-GRL,F; GR-LF7,F; GRL-F7,F): These represent the primary substitution path for the obsolete TLP781F(GRL,F). All variants maintain identical electrical specifications and package form factor while offering active product status from the original manufacturer. Selection among these variants should be based on current availability and supplier device package designation. Inventory levels range from 766 to 1123 pieces across variants.

Everlight EL816(M)(X) and EL816(M)(X)-V: These components provide parametric equivalence with active product status and RoHS3 compliance certification. The lower Vce saturation voltage (200mV vs 400mV) represents an improvement in switching characteristics. These parts are suitable for applications where RoHS compliance is required. Inventory availability is 926 to 990 pieces.

Vishay VO617C-3X016: This component exceeds the isolation voltage specification at 5300Vrms while maintaining all other critical electrical parameters. It carries RoHS3 compliance and was documented as an acceptable substitute in the original part specification. This option is appropriate for applications requiring enhanced isolation margin. Inventory level is 1053 pieces.

Frequently Asked Questions (FAQ)

Q: Can I directly replace TLP781F(GRL,F) with TLP785F variants without circuit modification?

A: Yes. The TLP785F variants maintain identical electrical specifications across all critical parameters including isolation voltage, current transfer ratio, output voltage and current ratings, and package form factor. Direct pin-compatible substitution is supported.

Q: What is the difference between the various TLP785F packaging designations?

A: The designations (GRL,F; D4-GRL,F; GR-LF7,F; GRL-F7,F) represent different supplier device package codes and tape/reel configurations. Electrical specifications remain identical. Selection should be based on supplier availability and procurement requirements.

Q: Are Everlight EL816 parts fully compatible with the original TLP781F design?

A: Everlight EL816(M)(X) and EL816(M)(X)-V parts meet all primary electrical specifications and package requirements. The lower Vce saturation voltage (200mV vs 400mV) is a performance improvement. These parts are suitable for direct substitution in standard isolation applications.

Q: What advantage does the Vishay VO617C-3X016 offer?

A: The VO617C-3X016 provides 5300Vrms isolation voltage compared to the 5000Vrms specification of the original part, offering enhanced isolation margin. All other electrical parameters remain equivalent. This part is appropriate for applications requiring higher isolation voltage ratings.

Q: Do all substitute parts have the same operating temperature range?

A: Yes. All substitute parts operate across the -55°C to 110°C temperature range, matching the original TLP781F(GRL,F) specification.

Q: Are there RoHS compliance differences among the substitute options?

A: Everlight EL816 variants and Vishay VO617C-3X016 carry RoHS3 compliance certification. Toshiba TLP785F variants do not list RoHS status in the provided specifications. Compliance requirements should be verified against your application standards.

Q: Can I use these parts interchangeably in existing PCB designs?

A: Yes. All substitute parts use the identical 4-DIP (0.400", 10.16mm) through-hole package and pin configuration, enabling direct PCB compatibility without layout modifications.

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