TLP781(DLT-HR,F) Equivalent & Substitute Parts

Part Overview

The TLP781(DLT-HR,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation. The part is currently obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for direct replacement in existing designs.

Key Parameters

Parameter	Value
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 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	Through Hole
Package / Case	4-DIP (0.300", 7.62mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
ECCN	EAR99
HTSUS	8541.49.8000

Substitute Part Grouping Explanation

Substitution of the obsolete TLP781(DLT-HR,F) is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Isolation voltage: 5000Vrms
Current transfer ratio range: 50% to 600% @ 5mA
Switching times: 3µs turn-on/off, 2µs/3µs rise/fall
Output voltage rating: 80V maximum
Output current capacity: 50mA per channel
Input/output characteristics: DC input, transistor output
Operating temperature range: -55°C to 110°C

Mechanical Equivalence Criteria:

Package type: 4-DIP (0.300", 7.62mm)
Mounting: Through Hole
Pin configuration: Single channel

All substitute parts listed maintain 100% compliance with these parameters. The TLP785 series variants represent the active product line replacement for the obsolete TLP781 base model, with identical electrical performance and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Isolation Voltage	CTR Min/Max	Output Voltage (Max)	Output Current	Package	Inventory (Pcs)
TLP781(DLT-HR,F)	Toshiba	Obsolete	5000Vrms	50% / 600%	80V	50mA	4-DIP	1048
TLP785	Toshiba	Active	5000Vrms	50% / 600%	80V	50mA	4-DIP	39200
TLP785(F)	Toshiba	Active	5000Vrms	50% / 600%	80V	50mA	4-DIP	2332
TLP785(D4,F)	Toshiba	Active	5000Vrms	50% / 600%	80V	50mA	4-DIP	754
TLP785(D4-LF6,F)	Toshiba	Active	5000Vrms	50% / 600%	80V	50mA	4-DIP	1134
TLP785(D4B-F6,F)	Toshiba	Active	5000Vrms	50% / 600%	80V	50mA	4-DIP	759
TLP785(D4GH-F6,F)	Toshiba	Active	5000Vrms	50% / 600%	80V	50mA	4-DIP	1004
TLP785(D4GL-F6,F)	Toshiba	Active	5000Vrms	50% / 600%	80V	50mA	4-DIP	1080
TLP785(LF6,F)	Toshiba	Active	5000Vrms	50% / 600%	80V	50mA	4-DIP	1157
TLP785(TELS,F)	Toshiba	Active	5000Vrms	50% / 600%	80V	50mA	4-DIP	3400
TLP785(LF6,F)	Toshiba	Active	5000Vrms	50% / 600%	80V	50mA	4-DIP	1157

Engineering Selection Recommendations

The TLP781(DLT-HR,F) is classified as obsolete. Direct replacement requires selection from the active TLP785 product family, which maintains identical electrical specifications and mechanical form factor.

Primary Recommendation: TLP785(F) offers the optimal balance of availability (2332 units in stock) and active product status with ROHS3 compliance and REACH unaffected designation.

Alternative Selections: TLP785(TELS,F) provides the highest inventory level (3400 units) for applications requiring extended supply assurance. TLP785 base variant offers maximum stock depth (39200 units) for high-volume requirements.

All listed TLP785 variants are electrically and mechanically interchangeable with the original TLP781(DLT-HR,F) and require no circuit modifications for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can TLP785 variants be used as direct replacements for TLP781(DLT-HR,F)?

A: Yes. All TLP785 variants listed maintain identical isolation voltage (5000Vrms), current transfer ratio range (50–600% @ 5mA), switching characteristics (3µs on/off, 2µs/3µs rise/fall), output ratings (80V, 50mA), and 4-DIP package configuration. No circuit modifications are required.

Q: What is the difference between TLP785 part number variants?

A: Variants such as TLP785(D4,F), TLP785(D4-LF6,F), and TLP785(TELS,F) represent different manufacturing codes and packaging specifications from Toshiba. All maintain identical electrical performance and are mechanically compatible in 4-DIP through-hole applications.

Q: Is the TLP785(F) variant with Tube packaging compatible with the original DIP package?

A: Yes. The TLP785(F) in Tube packaging contains the same die and electrical characteristics as other variants. Packaging format (Tube vs. standard) does not affect electrical performance or pin compatibility in circuit applications.

Q: Which TLP785 variant should be selected for new designs?

A: TLP785(F) is recommended for new designs due to active product status, ROHS3 compliance certification, and adequate inventory availability. This variant ensures long-term supply continuity and regulatory compliance.

Q: Are there any temperature or isolation voltage derating considerations when substituting?

A: No. All TLP785 variants operate across the identical temperature range (-55°C to 110°C) and maintain the same 5000Vrms isolation specification as the original TLP781(DLT-HR,F). No derating is required.

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