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

Part Overview

The TLP781F(GRL-LF7,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 surface mount configurations. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and component procurement.

Substiute Parts

TLP781F(GRL-LF7,F)

Toshiba Semiconductor and StorageIn Stock: 1061TLP781F(GRL-LF7,F) Datasheet

Current PartRFQ

TLP785F(GRL-F7,F

Toshiba Semiconductor and StorageIn Stock: 853TLP785F(GRL-F7,F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLP781F(GRL-LF7,F) is determined by the following critical parameters that must remain constant:

• Isolation Voltage: 5000Vrms (electrical requirement)
• Number of Channels: 1 (functional requirement)
• Output Type: Transistor (functional requirement)
• Current Transfer Ratio Range: 100% - 200% @ 5mA (performance requirement)
• Maximum Output Voltage: 80V (electrical requirement)
• Maximum Output Current: 50mA per channel (electrical requirement)
• Operating Temperature Range: -55°C ~ 110°C (environmental requirement)
• Input Type: DC (functional requirement)

The TLP785F(GRL-F7,F) meets all electrical and functional parameters. The primary difference is the mounting type and package configuration: TLP785F uses through-hole 4-DIP packaging versus the surface mount 4-SMD configuration of the TLP781F. This substitution is valid when board layout and assembly process can accommodate the through-hole package format.

Parameter Comparison

Engineering Selection Recommendations

The TLP785F(GRL-F7,F) is a valid functional substitute for the obsolete TLP781F(GRL-LF7,F) based on electrical and performance parameter equivalence. All critical isolation, switching, and output characteristics are identical.

Selection between these parts depends on board design constraints:

• TLP785F(GRL-F7,F) is recommended for new designs or redesigns where through-hole mounting is acceptable. This part carries active product status, ensuring long-term availability and supply chain stability.

• TLP781F(GRL-LF7,F) substitution to TLP785F(GRL-F7,F) requires PCB layout modification to accommodate 4-DIP through-hole footprint in place of the original 4-SMD surface mount configuration.

Both parts comply with identical export control classifications (EAR99) and moisture sensitivity levels (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can TLP785F(GRL-F7,F) directly replace TLP781F(GRL-LF7,F) on existing PCBs?

A: No. The TLP785F uses a 4-DIP through-hole package while the TLP781F uses a 4-SMD surface mount package. PCB footprint and assembly process modifications are required.

Q: Are the electrical characteristics identical between these parts?

A: Yes. Both parts provide identical isolation voltage (5000Vrms), current transfer ratio (100-200% @ 5mA), output voltage (80V max), output current (50mA), and operating temperature range (-55°C ~ 110°C).

Q: Why is the TLP781F classified as obsolete?

A: Product status is determined by the manufacturer. The TLP785F(GRL-F7,F) maintains active status and provides equivalent electrical performance.

Q: What are the key parameters that determine substitution eligibility?

A: Isolation voltage, number of channels, output type, current transfer ratio range, maximum output voltage and current, operating temperature range, and input type must all match between the original and substitute part.

Q: Are there any compliance or certification differences?

A: No. Both parts share identical ECCN (EAR99) and MSL (1 - Unlimited) classifications.

Q: What is the primary design consideration when substituting these parts?

A: The mounting type difference requires PCB redesign. The TLP785F through-hole 4-DIP package necessitates different board layout and assembly procedures compared to the surface mount 4-SMD configuration of the TLP781F.