TLP781(TP6,F) Equivalent & Substitute Parts

Part Overview

The TLP781(TP6,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, making equivalent and substitute parts necessary for ongoing design support and component procurement. Active alternatives from Toshiba and other manufacturers maintain identical or compatible electrical and mechanical specifications.

Key Parameters

Parameter	Value
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	Surface Mount
Package / Case	4-SMD, Gull Wing
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

Voltage - Isolation: 5000Vrms (mandatory)
Number of Channels: 1 (mandatory)
Output Type: Transistor (mandatory)
Current Transfer Ratio range: 50% to 600% @ 5mA (mandatory)
Voltage - Output (Max): 80V (mandatory)
Current - Output / Channel: 50mA (mandatory)
Operating Temperature: -55°C ~ 110°C (mandatory)
Package / Case: 4-SMD, Gull Wing (mandatory)
Input Type: DC (mandatory)

Toshiba TLP785 Series (Direct Manufacturer Equivalents): All TLP785 variants maintain identical electrical specifications and packaging to the TLP781(TP6,F). These parts differ only in product status (active vs. obsolete) and packaging format (Tape & Reel vs. standard packaging). The TLP785 series represents the direct successor line.

Everlight EL816 Series (Cross-Manufacturer Parametric Equivalents): The EL816 series from Everlight Electronics maintains all critical electrical parameters with minor variations in timing characteristics (Rise/Fall Time: 4µs, 3µs vs. 2µs, 3µs) and Vce Saturation (200mV vs. 400mV). These differences remain within acceptable operational tolerances for most applications requiring 5000Vrms isolation with transistor output.

Parameter Comparison

Parameter	TLP781(TP6,F)	TLP785(TP6,F)	TLP785(D4GL-T6,F)	TLP785(D4GH-T6,F)	EL816(S)(TD)	EL816(S)(TD)-V	EL816(S)(TU)-V
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba	Everlight	Everlight	Everlight
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Number of Channels	1	1	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	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
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	—	—	—
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	60mA	60mA	60mA	60mA	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	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
Mounting Type	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
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Not Applicable	Not Applicable	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	—	RoHS Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Toshiba TLP785 Series (Preferred for Direct Replacement): The TLP785(TP6,F), TLP785(D4GL-T6,F), and TLP785(D4GH-T6,F) are active products from the original manufacturer with identical electrical specifications to the obsolete TLP781(TP6,F). These parts maintain full compatibility and are the recommended primary choice for new designs and legacy system updates. All variants are RoHS compliant and available in high inventory quantities.

Everlight EL816 Series (Cross-Manufacturer Alternative): The EL816(S)(TD), EL816(S)(TD)-V, and EL816(S)(TU)-V from Everlight Electronics provide parametric equivalence with minor timing and saturation voltage differences. These parts are suitable for applications where the reduced Vce Saturation (200mV vs. 400mV) and slightly slower rise time (4µs vs. 2µs) are acceptable. All EL816 variants are ROHS3 compliant and represent a viable alternative when Toshiba TLP785 availability is constrained.

Product Status Consideration: All substitute parts listed are active products with confirmed inventory availability, eliminating the obsolescence risk associated with the original TLP781(TP6,F).

Frequently Asked Questions (FAQ)

Q: Can TLP785 parts directly replace TLP781(TP6,F) without circuit modification?

A: Yes. The TLP785 series maintains identical electrical specifications across all critical parameters including isolation voltage, current transfer ratio, output voltage, output current, and operating temperature range. The 4-SMD Gull Wing package is identical. No circuit modifications are required.

Q: What are the differences between TLP785(TP6,F), TLP785(D4GL-T6,F), and TLP785(D4GH-T6,F)?

A: All three variants maintain identical electrical specifications. Differences exist only in packaging format and RoHS compliance status. TLP785(TP6,F) is supplied in Tape & Reel format with MSL 1. TLP785(D4GL-T6,F) and TLP785(D4GH-T6,F) are supplied in Tape & Reel format with RoHS compliance and Not Applicable MSL designation. Selection depends on packaging requirements and compliance documentation needs.

Q: Can Everlight EL816 parts be used as direct substitutes?

A: EL816 parts are parametric equivalents, not direct replacements. They maintain the same isolation voltage, current transfer ratio, output voltage, and output current specifications. However, they differ in rise time (4µs vs. 2µs) and Vce Saturation (200mV vs. 400mV). These differences are acceptable for most applications but should be evaluated against specific circuit timing and power dissipation requirements.

Q: What is the significance of the Vce Saturation difference between TLP785 and EL816?

A: TLP785 parts have a maximum Vce Saturation of 400mV, while EL816 parts have 200mV. Lower saturation voltage in EL816 results in reduced power dissipation in the output transistor. This difference is beneficial for power-sensitive applications but requires verification that the lower saturation voltage does not affect circuit logic levels or switching behavior.

Q: Are all substitute parts RoHS compliant?

A: TLP785(D4GL-T6,F) and TLP785(D4GH-T6,F) are RoHS compliant. TLP785(TP6,F) is RoHS compliant. All EL816 variants are ROHS3 compliant. The original TLP781(TP6,F) does not specify RoHS compliance status. Compliance requirements should be confirmed against your design specifications.

Q: What inventory levels are available for these substitute parts?

A: TLP785(TP6,F) has 7400 units in stock. TLP785(D4GL-T6,F) has 4710 units. TLP785(D4GH-T6,F) has 5006 units. EL816(S)(TD) has 882 units. EL816(S)(TD)-V has 828 units. EL816(S)(TU)-V has 674 units. All parts are available as new original stock.

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