TLP781F(D4DLTGRL,F Equivalent & Substitute Parts

Part Overview

The TLP781F(D4DLTGRL,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 package. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer compatible performance within the same isolation voltage class and package form factor.

Key Parameters

Parameter	Value
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Output Type	Transistor
Package / Case	4-DIP (0.400", 10.16mm)
Mounting Type	Through Hole
Operating Temperature	-55°C ~ 110°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the TLP781F(D4DLTGRL,F is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms (VO617C-3X016 at 5300Vrms exceeds this requirement)
Output Type: Transistor output configuration
Number of Channels: Single channel
Package / Case: 4-DIP (0.400", 10.16mm) form factor
Mounting Type: Through Hole
Operating Temperature Range: -55°C ~ 110°C minimum coverage
Current Transfer Ratio: 100% @ 5mA minimum, 200% @ 5mA maximum
Output Current Capability: 50mA per channel
Maximum Output Voltage: 80V

All substitute parts listed meet or exceed these parameters. The TLP785F variants from Toshiba are direct parametric equivalents with active product status. The Everlight EL816 series and Vishay VO617C-3X016 provide functional equivalence with alternative electrical characteristics within acceptable tolerances.

Parameter Comparison

Parameter	TLP781F(D4DLTGRL,F	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
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
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Toshiba TLP785F Series (TLP785F(D4-GRL,F, TLP785F(GR-LF7,F, TLP785F(GRL,F, TLP785F(GRL-F7,F)

The TLP785F variants are direct parametric equivalents to the obsolete TLP781F(D4DLTGRL,F. All four variants maintain identical electrical specifications and active product status. Selection among these variants depends on packaging and lead configuration requirements. These parts are recommended as primary replacements due to complete parameter matching and manufacturer continuity.

Everlight EL816 Series (EL816(M)(X), EL816(M)(X)-V)

The Everlight EL816 optoisolators meet all critical substitution parameters with active product status and RoHS3 compliance. The Vce saturation specification of 200mV is superior to the original part's 400mV, indicating improved output transistor performance. Rise and fall times are slightly longer (4µs, 3µs versus 2µs, 3µs), which may require timing verification in applications with strict switching speed requirements. Forward voltage is marginally higher at 1.2V versus 1.15V.

Vishay VO617C-3X016

The Vishay VO617C-3X016 provides the highest isolation voltage rating at 5300Vrms, exceeding the original 5000Vrms specification. This part is supplied in tube packaging and maintains all other critical parameters. Turn-on and turn-off times are longer (6µs, 4µs) compared to the original specification (3µs, 3µs), requiring circuit timing analysis for applications sensitive to switching delays. Forward voltage is lower at 1.1V, providing improved input efficiency. RoHS3 compliance is confirmed.

Frequently Asked Questions (FAQ)

Q: Can I directly replace TLP781F(D4DLTGRL,F with any of the listed substitutes?

A: The TLP785F variants from Toshiba are direct parametric replacements with identical electrical specifications. The Everlight EL816 and Vishay VO617C-3X016 are functional equivalents that meet all critical isolation, output, and package requirements. Timing-sensitive applications should verify switching speed specifications, as some substitutes have longer propagation delays.

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

A: All four TLP785F variants (D4-GRL,F / GR-LF7,F / GRL,F / GRL-F7,F) share identical electrical parameters and performance characteristics. Differences are limited to packaging and lead configuration designations. Selection should be based on your specific PCB assembly requirements and supplier availability.

Q: Does the higher isolation voltage of the VO617C-3X016 (5300Vrms vs 5000Vrms) provide any advantage?

A: The VO617C-3X016 exceeds the isolation requirement, providing additional safety margin in high-voltage applications. However, this does not improve performance in circuits designed for 5000Vrms isolation. The trade-off is longer switching times (6µs turn-on versus 3µs for the original), which may impact timing-critical circuits.

Q: Are there compliance or certification differences between substitutes?

A: The Everlight EL816 and Vishay VO617C-3X016 are both RoHS3 compliant. All parts carry MSL 1 (Unlimited) moisture sensitivity ratings. The original TLP781F(D4DLTGRL,F does not list RoHS status due to its obsolete classification. For new designs, the active-status substitutes with confirmed RoHS3 compliance are preferred.

Q: How do the switching time differences affect circuit performance?

A: The original TLP781F specifies 3µs turn-on and 3µs turn-off times. The Everlight EL816 maintains similar rise/fall times (4µs, 3µs) but lacks turn-on/turn-off specifications. The Vishay VO617C-3X016 has longer turn-on time (6µs) and turn-off time (4µs). Applications with timing windows below 6µs should be analyzed to confirm compatibility.

Q: Can I use these substitutes in existing PCB designs without modification?

A: Yes. All substitute parts use the identical 4-DIP (0.400", 10.16mm) through-hole package. Direct pin-for-pin replacement is possible without PCB layout changes. However, circuit timing analysis is recommended for applications where switching speed is critical to system performance.

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