TLP781F(D4BL-LF7,F) Equivalent & Substitute Parts

Part Overview

The TLP781F(D4BL-LF7,F) is a Toshiba optoisolator with transistor output, rated for 5000Vrms isolation voltage in a 4-DIP through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part delivers single-channel isolation with 200-400% current transfer ratio at 5mA input, suitable for applications requiring high-voltage galvanic isolation with DC input control.

Key Parameters

Parameter	Value
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
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Operating Temperature	-55°C ~ 110°C
Mounting Type	Through Hole
Package / Case	4-DIP (0.400", 10.16mm)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the TLP781F(D4BL-LF7,F) is determined by the following critical parameters:

Isolation Voltage: 5000Vrms (mandatory match)
Number of Channels: 1 (mandatory match)
Output Type: Transistor (mandatory match)
Current Transfer Ratio Range: 200-400% @ 5mA (acceptable range)
Maximum Output Voltage: 80V (mandatory match)
Maximum Output Current: 50mA (mandatory match)
Operating Temperature Range: -55°C ~ 110°C (mandatory match)
Package Type: 4-DIP through-hole (preferred for direct replacement)

Substitute parts are grouped into two categories:

Direct Manufacturer Substitutes (Toshiba TLP785 Series): Parts from the same manufacturer with identical electrical specifications and through-hole packaging, differing only in packaging variant codes or current transfer ratio maximum values (up to 600%).

Parametric Equivalents (Everlight EL816/EL817 Series): Parts from alternative manufacturers meeting all critical electrical parameters and package requirements, with minor variations in rise/fall times and saturation voltage.

Parameter Comparison

Parameter	TLP781F(D4BL-LF7,F)	TLP785F(D4BLF7,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
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	200% @ 5mA	200% @ 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
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
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
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	4-DIP (0.400", 10.16mm)	4-SMD, Gull Wing	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	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (Through-Hole 4-DIP):

Select from the Toshiba TLP785F series variants: TLP785F(BL-LF7,F), TLP785F(BLL,F), TLP785F(BLL-F7,F), or TLP785F(D4-BLL,F). These parts maintain identical through-hole packaging, electrical specifications, and active product status. The TLP785F(D4BLF7,F) offers surface-mount packaging and is not suitable for direct board-level replacement without PCB redesign.

For Alternative Manufacturer Substitution:

The Everlight EL816(M)(C), EL816(M)(C)-V, EL817(M)(C)-G, and EL817(M)(C)-VG optoisolators meet all critical electrical parameters and package requirements. These parts carry ROHS3 compliance certification. The EL816 variants feature lower saturation voltage (200mV vs. 400mV), improving switching efficiency. The EL817 variants exhibit slower rise/fall times (6µs/8µs vs. 2µs/3µs), suitable for applications where switching speed is not critical.

Product Status Consideration:

All recommended substitutes maintain active product status, ensuring long-term availability and supply chain stability compared to the obsolete TLP781F(D4BL-LF7,F).

Frequently Asked Questions (FAQ)

Q: Can TLP785F(D4BLF7,F) replace TLP781F(D4BL-LF7,F) directly on the PCB?

A: No. The TLP785F(D4BLF7,F) uses surface-mount 4-SMD packaging with gull-wing leads, while the TLP781F requires through-hole 4-DIP mounting. PCB redesign is necessary. Use TLP785F(BL-LF7,F), TLP785F(BLL,F), TLP785F(BLL-F7,F), or TLP785F(D4-BLL,F) for direct through-hole replacement.

Q: What is the difference between TLP785F variants?

A: All TLP785F through-hole variants (BL-LF7,F / BLL,F / BLL-F7,F / D4-BLL,F) share identical electrical specifications and 4-DIP packaging. Differences exist only in packaging codes and supplier designations. Selection depends on supplier availability and internal part numbering systems.

Q: Are Everlight EL816 and EL817 parts fully compatible with TLP781F?

A: Everlight parts meet all critical electrical parameters: 5000Vrms isolation, 1 channel, 200-400% current transfer ratio, 80V maximum output, 50mA output current, and -55°C to 110°C operating range. Both use 4-DIP through-hole packaging. Minor differences include lower saturation voltage (200mV vs. 400mV) and different rise/fall times. These differences do not affect functional compatibility in standard isolation applications.

Q: What is the significance of the current transfer ratio maximum difference (400% vs. 600%)?

A: The TLP785F(D4BLF7,F) surface-mount variant specifies 600% maximum current transfer ratio, while all through-hole variants and Everlight equivalents specify 400%. This difference reflects manufacturing process variations between package types. For through-hole applications, 400% maximum is the applicable specification.

Q: Do Everlight parts require different PCB layout considerations?

A: No. Everlight EL816 and EL817 parts use identical 4-DIP through-hole packaging and pin configuration as the TLP781F. PCB layout, footprint, and mounting procedures remain unchanged.

Q: Which substitute offers the best performance for high-speed switching applications?

A: Toshiba TLP785F variants maintain the original 2µs/3µs rise/fall times. Everlight EL816 variants offer 4µs/3µs rise/fall times. Everlight EL817 variants specify 6µs/8µs rise/fall times. For applications requiring fastest switching response, select Toshiba TLP785F series.

Q: Are there compliance differences between Toshiba and Everlight options?

A: Everlight EL816 and EL817 parts carry ROHS3 compliance certification. Toshiba TLP785F compliance status is not specified in the provided data. Verify compliance requirements against your application standards before final selection.

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