TLP781(LF6,F) Equivalent & Substitute Parts

Part Overview

The TLP781(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 necessary for ongoing design support and procurement.

Substiute Parts

TLP781(LF6,F)

Toshiba Semiconductor and StorageIn Stock: 1042TLP781(LF6,F) Datasheet

Current PartRFQ

TLP785(LF6,F

Toshiba Semiconductor and StorageIn Stock: 1171TLP785(LF6,F Datasheet

DirectRFQ

TLP785F(D4-LF7,F

Toshiba Semiconductor and StorageIn Stock: 1197TLP785F(D4-LF7,F Datasheet

Parametric EquivalentRFQ

TLP785F(LF7,F

Toshiba Semiconductor and StorageIn Stock: 917TLP785F(LF7,F Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLP781(LF6,F) is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

• Isolation voltage: 5000Vrms
• Number of channels: 1
• Current transfer ratio range: 50% to 600% @ 5mA
• Switching timing: 3µs turn-on/off, 2µs/3µs rise/fall times
• Output voltage maximum: 80V
• Output current per channel: 50mA
• Input type: DC
• Output type: Transistor
• Operating temperature range: -55°C ~ 110°C

Mechanical Compatibility Criteria:

• Package type: 4-pin configuration
• Mounting technology compatibility

Substitute parts are classified into two categories:

Direct Manufacturer Substitute: TLP785(LF6,F) maintains identical electrical specifications and differs only in mounting technology (through-hole vs. surface mount), making it suitable for designs where package transition is acceptable.

Parametric Equivalents: TLP785F(D4-LF7,F) and TLP785F(LF7,F) provide identical electrical performance and surface-mount packaging, differing only in product status and inventory availability.

Parameter Comparison

Engineering Selection Recommendations

For Surface Mount Applications: TLP785F(D4-LF7,F) and TLP785F(LF7,F) are the primary substitutes for TLP781(LF6,F). Both maintain identical electrical specifications and surface-mount packaging. Selection between these two is based on inventory availability and supplier device package designation. Both parts carry active product status and meet all compliance requirements (ECCN: EAR99, HTSUS: 8541.49.8000).

For Through-Hole Applications: TLP785(LF6,F) provides complete electrical equivalence with the original part but requires PCB layout modification due to its 4-DIP through-hole package. This substitute is appropriate only when design revision to accommodate through-hole mounting is feasible.

Product Status Consideration: The original TLP781(LF6,F) is classified as obsolete. All substitute parts listed carry active product status, ensuring long-term availability and continued manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can TLP785(LF6,F) be used as a direct replacement for TLP781(LF6,F)?

A: TLP785(LF6,F) is electrically equivalent but differs in mounting technology. The original part uses surface-mount (4-SMD, Gull Wing) packaging, while TLP785(LF6,F) uses through-hole (4-DIP) packaging. Substitution requires PCB redesign to accommodate the different footprint.

Q: What is the difference between TLP785F(D4-LF7,F) and TLP785F(LF7,F)?

A: Both parts are parametrically equivalent with identical electrical specifications and surface-mount packaging. The difference lies in the supplier device package designation (D4-LF7 vs. LF7). Electrical performance and PCB compatibility are equivalent.

Q: Are all substitute parts pin-compatible with TLP781(LF6,F)?

A: TLP785F(D4-LF7,F) and TLP785F(LF7,F) are pin-compatible as they share the same 4-SMD, Gull Wing package. TLP785(LF6,F) is not pin-compatible due to its 4-DIP through-hole package, requiring PCB layout modification.

Q: Do the substitute parts meet the same isolation voltage specification?

A: All substitute parts maintain 5000Vrms isolation voltage, identical to the original TLP781(LF6,F).

Q: What is the impact of the obsolete status of TLP781(LF6,F)?

A: The obsolete status indicates the part is no longer manufactured. Substitution with active-status parts (TLP785 series) ensures continued availability and manufacturing support for new designs and production runs.

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

A: All parts share identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications and MSL rating (1 - Unlimited), indicating equivalent compliance and handling requirements.