TLP781(GRH-TP6,F) Equivalent & Substitute Parts

Part Overview

The TLP781(GRH-TP6,F) 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 surface mount configurations. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	150% @ 5mA
Current Transfer Ratio (Max)	300% @ 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	Surface Mount
Package / Case	4-SMD, Gull Wing
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the TLP781(GRH-TP6,F) is determined by strict equivalence across the following critical parameters:

Single channel configuration with transistor output
5000Vrms isolation voltage
Current transfer ratio range of 150% to 300% @ 5mA
DC input type
Maximum output voltage of 80V
Maximum output current of 50mA per channel
Operating temperature range of -55°C to 110°C
4-SMD surface mount package with gull wing leads

The TLP785(GRH-TP6,F) from Toshiba is a direct manufacturer substitute with identical electrical specifications and active product status. The Everlight Electronics EL816 series variants meet all parametric requirements with minor timing variations and improved saturation characteristics. All substitute parts maintain the same package footprint and pin configuration, enabling direct board-level replacement.

Parameter Comparison

Parameter	TLP781(GRH-TP6,F)	TLP785(GRH-TP6,F)	EL816(S)(Y)(TD)	EL816(S)(Y)(TD)-V	EL816(S)(Y)(TU)	EL816(S)(Y)(TU)-V	EL816(S1)(Y)(TD)	EL816(S1)(Y)(TD)-V	EL816(S1)(Y)(TU)	EL816(S1)(Y)(TU)-V
Manufacturer	Toshiba	Toshiba	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight
Number of Channels	1	1	1	1	1	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	150% @ 5mA	150% @ 5mA	150% @ 5mA	150% @ 5mA	150% @ 5mA	150% @ 5mA	150% @ 5mA	150% @ 5mA	150% @ 5mA	150% @ 5mA
Current Transfer Ratio (Max)	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA	300% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
Input Type	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV
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	-55°C ~ 110°C	-55°C ~ 110°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The TLP785(GRH-TP6,F) is the primary substitute for the obsolete TLP781(GRH-TP6,F), offering identical electrical specifications with active product status and continuous availability. This Toshiba part maintains full parametric compatibility and is the preferred choice for direct replacement in existing designs.

The Everlight Electronics EL816 series variants provide parametric equivalence across all critical isolation, current transfer, and output specifications. All EL816 variants are active products with ROHS3 compliance certification. The EL816 series exhibits improved saturation characteristics (200mV maximum versus 400mV) and slightly higher forward voltage (1.2V typical versus 1.15V), which are within acceptable operating margins for most applications. Rise time is marginally slower at 4µs compared to 2µs for the original part.

Selection between Toshiba TLP785 and Everlight EL816 variants depends on supply chain availability, cost considerations, and compliance requirements. Both families meet the core electrical and mechanical requirements for direct board-level substitution.

Frequently Asked Questions (FAQ)

Q: Can the EL816 series directly replace the TLP781 on existing PCBs?

A: Yes. All EL816 variants maintain identical 4-SMD gull wing package geometry and pin configuration, enabling direct PCB replacement without layout modifications.

Q: What is the significance of the EL816 variant designations (S, S1, TD, TU, -V)?

A: The variant designations represent different manufacturing specifications within the EL816 base product family. All variants listed meet the parametric requirements for substitution. Selection among variants depends on specific supply availability and application requirements.

Q: Are there differences in isolation voltage between substitute parts?

A: No. All substitute parts maintain 5000Vrms isolation voltage, matching the original TLP781 specification.

Q: How do the timing characteristics of EL816 parts compare to the original?

A: The EL816 series has a rise time of 4µs compared to 2µs for the TLP781. Turn-on and turn-off times are not specified for EL816 variants. These timing differences are within acceptable ranges for most DC isolation applications but should be evaluated for time-critical circuits.

Q: What is the impact of the lower Vce saturation voltage in EL816 parts?

A: The EL816 series exhibits 200mV maximum saturation voltage compared to 400mV for the TLP781. This represents improved output transistor saturation performance, reducing power dissipation and heat generation in the output stage.

Q: Are all substitute parts RoHS compliant?

A: The TLP785 RoHS status is not specified in the provided data. All Everlight EL816 variants are ROHS3 compliant, meeting current environmental and regulatory requirements.

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