TLP781(D4,F) Equivalent & Substitute Parts

Part Overview

The TLP781(D4,F) is a photocoupler optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation in a 4-DIP through-hole package and is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active product lines are necessary for new designs and ongoing production requirements. The TLP785 series and EL816 from Everlight Electronics provide direct parametric equivalents with identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Isolation Voltage	5000Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Maximum Output Voltage	80V
Maximum Output Current	50mA
Operating Temperature Range	-55°C to 110°C
Package Type	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the TLP781(D4,F) are classified into two categories based on manufacturer and product status:

Toshiba TLP785 Series (Direct Manufacturer Substitutes): These parts maintain identical electrical and mechanical specifications across all critical parameters: 5000Vrms isolation voltage, 1 channel configuration, transistor output type, current transfer ratio range (50% to 600% @ 5mA), maximum output voltage (80V), maximum output current (50mA), operating temperature range (-55°C to 110°C), and 4-DIP package format. All TLP785 variants are active products with higher inventory availability than the obsolete TLP781(D4,F).

Everlight EL816 (Cross-Manufacturer Equivalent): This part matches all critical isolation, channel, output type, and package specifications. Minor variations exist in rise/fall time (4µs, 3µs versus 3µs, 2µs) and Vce saturation (200mV versus 400mV), which remain within acceptable operating margins for most applications.

Substitution is determined by matching: isolation voltage, number of channels, output type, current transfer ratio specifications, maximum output voltage and current, operating temperature range, and package/case format.

Parameter Comparison

Parameter	TLP781(D4,F)	TLP785(D4,F)	TLP785	TLP785(D4-LF6,F)	TLP785(D4B-F6,F)	TLP785(D4GH-F6,F)	TLP785(D4GL-F6,F)	TLP785(F)	TLP785(LF6,F)	TLP785(TELS,F)	EL816
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	Everlight
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Isolation Voltage	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA
Maximum Output Voltage	80V	80V	80V	80V	80V	80V	80V	80V	80V	80V	80V
Maximum Output Current	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Operating Temperature	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C	-55°C to 110°C
Package / Case	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Inventory Status	875 Pcs	754 Pcs	39200 Pcs	1134 Pcs	759 Pcs	1004 Pcs	1080 Pcs	2332 Pcs	1157 Pcs	3400 Pcs	2400 Pcs

Engineering Selection Recommendations

For new designs and production applications, the TLP785 series from Toshiba is the primary substitute for the obsolete TLP781(D4,F). All TLP785 variants maintain active product status with significantly higher inventory availability. The TLP785(F) variant offers the largest stock position (2332 pcs) and carries RoHS3 compliance certification, making it suitable for applications with environmental regulatory requirements.

The TLP785(TELS,F) variant provides the highest inventory level (3400 pcs) among Toshiba options and is recommended for high-volume production requirements.

For cross-manufacturer flexibility, the Everlight EL816 is electrically equivalent with active product status and 2400 pcs inventory availability. This option is suitable when supply chain diversification is required or when Toshiba variants face allocation constraints.

All substitute parts are compatible with existing PCB layouts designed for the 4-DIP through-hole package format and require no circuit modifications for direct replacement.

Frequently Asked Questions (FAQ)

Q: Can TLP785 variants be used as direct replacements for TLP781(D4,F) without circuit modifications?

A: Yes. All TLP785 variants maintain identical electrical specifications for isolation voltage (5000Vrms), current transfer ratio (50% to 600% @ 5mA), output voltage and current ratings (80V, 50mA), and operating temperature range (-55°C to 110°C). The 4-DIP through-hole package format is identical, allowing direct PCB substitution without layout changes.

Q: What is the difference between TLP785 package variants (D4,F), (D4-LF6,F), (D4B-F6,F), etc.?

A: These designations represent internal manufacturing codes and tape/reel packaging specifications. All variants share identical electrical performance and 4-DIP package dimensions. Selection between variants is determined by procurement and inventory availability rather than functional differences.

Q: Is the Everlight EL816 fully compatible with TLP781(D4,F)?

A: The EL816 matches all critical specifications: 5000Vrms isolation, 1 channel, transistor output, 50% to 600% current transfer ratio, 80V maximum output voltage, 50mA maximum output current, -55°C to 110°C operating range, and 4-DIP package. Minor timing differences (rise/fall time and Vce saturation) are within acceptable operating margins for most applications.

Q: Why is TLP781(D4,F) listed as obsolete?

A: The TLP781 series has been superseded by the TLP785 series, which provides identical electrical performance with improved manufacturing availability and active product support from Toshiba.

Q: Which substitute part should be selected for new production designs?

A: The TLP785(F) is recommended for new designs due to active product status, RoHS3 compliance, and adequate inventory (2332 pcs). For high-volume requirements, TLP785(TELS,F) offers the largest inventory position (3400 pcs).

Q: Are all substitute parts RoHS compliant?

A: TLP785(F) carries RoHS3 compliance certification. Other TLP785 variants and EL816 do not list RoHS status in provided specifications. Verify compliance requirements with your procurement or quality department before final part selection.

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