TLP781(BL-LF6,F) Equivalent & Substitute Parts

Part Overview

The TLP781(BL-LF6,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. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and procurement planning.

Substiute Parts

TLP781(BL-LF6,F)

Toshiba Semiconductor and StorageIn Stock: 1134TLP781(BL-LF6,F) Datasheet

Current PartRFQ

TLP785(BL-LF6,F

Toshiba Semiconductor and StorageIn Stock: 864TLP785(BL-LF6,F Datasheet

DirectRFQ

TLP785F(D4BLF7,F

Toshiba Semiconductor and StorageIn Stock: 685TLP785F(D4BLF7,F Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLP781(BL-LF6,F) is determined by the following critical parameters that must remain constant across all equivalent parts:

• Single channel configuration
• 5000Vrms isolation voltage
• Transistor output topology
• Current transfer ratio range: 200% to 600% @ 5mA
• Maximum output voltage: 80V
• Maximum output current: 50mA per channel
• DC input type
• Operating temperature range: -55°C ~ 110°C
• Moisture sensitivity level: 1 (Unlimited)

The substitute parts identified maintain electrical equivalence across these parameters. Packaging differences (Surface Mount vs. Through Hole) represent the primary distinction between substitute options.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using TLP781(BL-LF6,F), the following selection criteria apply:

Surface Mount Applications: TLP785F(D4BLF7,F) is the direct equivalent, maintaining identical packaging (4-SMD, Gull Wing) and all electrical parameters. This part carries Active product status, ensuring long-term availability and supply chain continuity.

Through Hole Applications: TLP785(BL-LF6,F) provides electrical equivalence with a package change to 4-DIP (0.300", 7.62mm). This substitution requires PCB layout modification but maintains all critical electrical specifications. This part also carries Active product status.

Both substitute parts are manufactured by Toshiba Semiconductor and Storage and comply with identical regulatory classifications (ECCN: EAR99, HTSUS: 8541.49.8000).

Frequently Asked Questions (FAQ)

Q: Can TLP785F(D4BLF7,F) directly replace TLP781(BL-LF6,F) without PCB modification?

A: Yes. Both parts use identical 4-SMD, Gull Wing packaging and maintain all electrical parameters including isolation voltage, current transfer ratio, output voltage/current ratings, and timing specifications.

Q: What is the primary difference between TLP785(BL-LF6,F) and TLP785F(D4BLF7,F)?

A: The primary difference is packaging. TLP785(BL-LF6,F) uses 4-DIP (Through Hole) configuration, while TLP785F(D4BLF7,F) uses 4-SMD (Surface Mount) configuration. All electrical parameters remain identical.

Q: Why is TLP781(BL-LF6,F) classified as obsolete?

A: Product status reflects manufacturer lifecycle decisions. Active alternatives with identical electrical specifications are available from Toshiba.

Q: Are there any compliance or certification differences between the main part and substitutes?

A: No. All three parts share identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications and Moisture Sensitivity Level 1 (Unlimited).

Q: What parameters must remain constant when selecting a substitute optoisolator?

A: Critical parameters include isolation voltage (5000Vrms), number of channels (1), output type (Transistor), current transfer ratio range (200-600% @ 5mA), maximum output voltage (80V), maximum output current (50mA), and operating temperature range (-55°C ~ 110°C).