TLP781(D4-BL-SD,F) Equivalent & Substitute Parts

Part Overview

The TLP781(D4-BL-SD,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation and is designed for DC input applications requiring galvanic isolation in 4-DIP through-hole packages. The part is currently classified as obsolete, making identification of active equivalent alternatives necessary for ongoing design support and procurement.

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)	600% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Package / Case	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Operating Temperature	-55°C ~ 110°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TLP781(D4-BL-SD,F) is determined by strict equivalence across 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% to 600% @ 5mA (mandatory match)
Package / Case: 4-DIP (0.300", 7.62mm) (mandatory match)
Mounting Type: Through Hole (mandatory match)
Maximum Output Voltage: 80V (mandatory match)
Maximum Output Current: 50mA per channel (mandatory match)
Operating Temperature Range: -55°C ~ 110°C (mandatory match)

All substitute parts listed maintain identical electrical and mechanical specifications across these parameters. Differences in product status (active vs. obsolete) and packaging format (tube vs. other) do not affect functional equivalence.

Parameter Comparison

Parameter	TLP781(D4-BL-SD,F)	TLP785(D4-BL,F)	TLP785(BL,F)	TLP785(BL-LF6,F)	TLP785(D4BL-F6,F)
Manufacturer	Toshiba	Toshiba	Toshiba	Toshiba	Toshiba
Number of Channels	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs
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)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C
Product Status	Obsolete	Active	Active	Active	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99	EAR99	EAR99	EAR99
HTSUS	8541.49.8000	8541.49.8000	8541.49.8000	8541.49.8000	8541.49.8000

Engineering Selection Recommendations

All listed substitute parts are functionally equivalent to the TLP781(D4-BL-SD,F) based on identical electrical and mechanical parameters. The primary distinction is product status: the original part is obsolete, while all substitute options are active products from Toshiba Semiconductor and Storage.

TLP785(BL,F) carries RoHS Compliant certification, providing additional environmental compliance documentation. All parts maintain MSL Level 1 (Unlimited) moisture sensitivity classification and identical export control designations (ECCN: EAR99, HTSUS: 8541.49.8000).

Selection among the active alternatives should be based on packaging format availability and procurement lead times. The TLP785(BL,F) variant in tube packaging offers the highest inventory availability (5999 pcs), while other variants provide alternative packaging configurations.

Frequently Asked Questions (FAQ)

Q: Can TLP785 series parts directly replace the obsolete TLP781(D4-BL-SD,F)?

A: Yes. The TLP785(D4-BL,F), TLP785(BL,F), TLP785(BL-LF6,F), and TLP785(D4BL-F6,F) are parametric equivalents with identical isolation voltage (5000Vrms), current transfer ratio (200-600% @ 5mA), output specifications (80V max, 50mA per channel), and 4-DIP through-hole package dimensions. All maintain the same operating temperature range (-55°C ~ 110°C) and switching characteristics.

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

A: The variants differ in packaging format and lead-free compliance designations within their part numbers. The electrical and mechanical specifications remain identical across all variants. Differences in inventory levels and product status reflect current manufacturing and distribution status only.

Q: Are there any compliance or certification differences between these parts?

A: TLP785(BL,F) is documented as RoHS Compliant. All parts share identical MSL Level 1 (Unlimited) moisture sensitivity classification and export control designations. No functional compliance differences affect substitution eligibility.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes. All substitute parts use the identical 4-DIP (0.300", 7.62mm) through-hole package with matching pin configurations. PCB layouts and footprints designed for the TLP781(D4-BL-SD,F) accommodate all listed substitute parts without modification.

Q: What should be considered when selecting among the available substitutes?

A: Selection criteria are limited to packaging format preference and procurement availability. Electrical performance, thermal characteristics, and isolation specifications are identical. Choose based on current inventory levels and delivery requirements for your application timeline.

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