TLP781F(D4BLL-F7,F Optoisolator Equivalent & Substitute Parts

Part Overview

The TLP781F(D4BLL-F7,F is a Toshiba Semiconductor optoisolator transistor output device rated for 5000Vrms isolation voltage in a 4-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates as a single-channel photocoupler with DC input and transistor output configuration, suitable for high-voltage isolation applications requiring galvanic separation.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP781F(D4BLL-F7,F
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	200% @ 5mA
Current Transfer Ratio (Max)	400% @ 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 (0.400", 10.16mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the TLP781F(D4BLL-F7,F is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Voltage - Isolation: 5000Vrms (mandatory match)
Number of Channels: 1 (mandatory match)
Output Type: Transistor (mandatory match)
Package / Case: 4-DIP (0.400", 10.16mm) (mandatory match)
Input Type: DC (mandatory match)
Current Transfer Ratio range: 200% to 400% @ 5mA (core functional requirement)
Operating Temperature: -55°C ~ 110°C (mandatory match)
Voltage - Output (Max): 80V (mandatory match)
Current - Output / Channel: 50mA (mandatory match)

Substitute Categories:

Category 1: Parametric Equivalents (Toshiba TLP785 Series) These parts maintain identical electrical specifications to the main part, including current transfer ratio range of 200% to 400% @ 5mA, timing characteristics, and output ratings. All variants are active products with improved availability.

Category 2: Parametric Equivalents (Everlight EL816 Series) These parts meet all mandatory isolation, package, and output specifications. Current transfer ratio range matches at 200% to 400% @ 5mA. Minor variations exist in Vce saturation (200mV vs 400mV) and rise/fall timing, but remain within functional compatibility for standard isolation applications.

Category 3: Parametric Equivalents (Everlight EL817 Series) These parts satisfy all mandatory electrical and mechanical requirements with identical isolation voltage, package, and output specifications. Current transfer ratio and operating temperature ranges match the main part. Rise/fall timing is slower (6µs, 8µs) but remains suitable for non-critical timing applications.

Parameter Comparison

Parameter	TLP781F(D4BLL-F7,F	TLP785F(D4B-F7,F	TLP785F(BL-LF7,F	TLP785F(BLL,F	TLP785F(BLL-F7,F	TLP785F(D4-BLL,F	EL816(M)(C)	EL816(M)(C)-V	EL817(M)(C)-G	EL817(M)(C)-VG
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba	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)	200% @ 5mA	50% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA
Current Transfer Ratio (Max)	400% @ 5mA	600% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	—	—	—	—
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	4µs, 3µs	4µs, 3µs	6µs, 8µs	6µs, 8µs
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	1.15V	1.15V	1.15V	1.15V	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	400mV	400mV	400mV	400mV	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
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)	4-DIP (0.400", 10.16mm)	4-DIP (0.400", 10.16mm)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	—	—	—	—	—	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: Toshiba TLP785 Series

The TLP785F variants (TLP785F(D4B-F7,F, TLP785F(BL-LF7,F, TLP785F(BLL,F, TLP785F(BLL-F7,F, and TLP785F(D4-BLL,F) are the preferred substitutes for the obsolete TLP781F(D4BLL-F7,F. All TLP785 variants are active products from the same manufacturer, ensuring design continuity and supply chain stability. Five of the six TLP785 variants maintain identical electrical specifications to the main part, including current transfer ratio range of 200% to 400% @ 5mA and timing characteristics. The TLP785F(D4B-F7,F variant exhibits a broader current transfer ratio range (50% to 600% @ 5mA) and should be evaluated for application-specific requirements.

Secondary Recommendation: Everlight EL816 Series

The EL816(M)(C) and EL816(M)(C)-V optoisolators from Everlight Electronics are functionally equivalent alternatives. Both parts maintain the required 5000Vrms isolation voltage, single-channel configuration, and 4-DIP package. Current transfer ratio specifications match at 200% to 400% @ 5mA. Vce saturation is improved at 200mV compared to 400mV in the main part, providing lower output impedance. Both variants are ROHS3 compliant and active products with strong inventory availability.

Tertiary Recommendation: Everlight EL817 Series

The EL817(M)(C)-G and EL817(M)(C)-VG optoisolators satisfy all mandatory electrical and mechanical requirements. These parts maintain 5000Vrms isolation, single-channel transistor output, and 4-DIP package configuration. Current transfer ratio range matches at 200% to 400% @ 5mA. Rise and fall times are slower (6µs and 8µs respectively) compared to the main part (2µs and 3µs), making these suitable for applications where switching speed is not critical. Both variants are ROHS3 compliant and active products.

Selection Criteria:

For applications requiring identical timing performance and electrical characteristics, select from the Toshiba TLP785 series. For applications where improved saturation voltage is beneficial and timing is non-critical, select from the Everlight EL816 series. For cost-optimized designs where slower switching is acceptable, select from the Everlight EL817 series. All recommended substitutes are active products with established supply chains, addressing the obsolescence of the original TLP781F(D4BLL-F7,F component.

Frequently Asked Questions (FAQ)

Q: Can I directly replace TLP781F(D4BLL-F7,F with any TLP785 variant?

A: Yes, with one exception. Five of the six TLP785 variants (TLP785F(BL-LF7,F, TLP785F(BLL,F, TLP785F(BLL-F7,F, and TLP785F(D4-BLL,F) are direct electrical equivalents. The TLP785F(D4B-F7,F has a broader current transfer ratio range (50% to 600% @ 5mA) and should be evaluated for your specific application requirements before substitution.

Q: What is the difference between Toshiba TLP785 and Everlight EL816 optoisolators?

A: Both maintain identical isolation voltage (5000Vrms), package (4-DIP), and current transfer ratio range (200% to 400% @ 5mA). The primary difference is Vce saturation: EL816 parts have 200mV saturation compared to 400mV in TLP785 parts. EL816 variants are ROHS3 compliant. Timing characteristics are slightly different, with EL816 showing 4µs rise time versus 2µs in TLP785.

Q: Are Everlight EL817 parts suitable for high-speed switching applications?

A: EL817 parts have slower rise and fall times (6µs and 8µs) compared to the original TLP781F (2µs and 3µs). They are suitable for standard isolation applications but not recommended for applications requiring fast switching response. For timing-critical designs, use TLP785 or EL816 variants.

Q: Do all substitute parts have the same package footprint?

A: Yes. All recommended substitutes use the 4-DIP (0.400", 10.16mm) package, ensuring direct PCB compatibility with the original TLP781F(D4BLL-F7,F without layout modifications.

Q: Which substitute parts are ROHS3 compliant?

A: All Everlight variants (EL816 and EL817 series) are ROHS3 compliant. Toshiba TLP785 variants do not list RoHS compliance status in the provided specifications.

Q: What is the inventory status of these substitute parts?

A: All recommended substitutes are active products with established inventory. Toshiba TLP785 variants range from 707 to 1022 pieces in stock. Everlight EL816 and EL817 variants range from 806 to 1135 pieces in stock, providing reliable supply availability.

Q: Can I use EL817 parts in place of EL816 parts?

A: Both EL817 and EL816 meet the mandatory electrical and mechanical requirements for substitution. The primary difference is timing: EL817 has slower rise/fall times (6µs, 8µs) versus EL816 (4µs, 3µs). Select based on your application's switching speed requirements.

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