TLP781F(D4-LF7,F) Equivalent & Substitute Parts

Part Overview

The TLP781F(D4-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 equivalent and substitute components essential for ongoing design support, maintenance, and production continuity.

Substiute Parts

TLP781F(D4-LF7,F)

Toshiba Semiconductor and StorageIn Stock: 941TLP781F(D4-LF7,F) Datasheet

Current PartRFQ

TLP785F(D4-LF7,F

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

DirectRFQ

TLP785F(LF7,F

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLP781F(D4-LF7,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: 50% to 600% @ 5mA (mandatory match)
• Switching Characteristics: Turn On/Off Time 3µs, Rise/Fall Time 2µs/3µs (mandatory match)
• Output Specifications: Maximum 80V, 50mA per channel (mandatory match)
• Package Type: 4-SMD, Gull Wing surface mount (mandatory match)
• Operating Temperature Range: -55°C ~ 110°C (mandatory match)

Substitute parts identified below maintain identical electrical and mechanical specifications across all parameters listed above.

Parameter Comparison

Engineering Selection Recommendations

The TLP781F(D4-LF7,F) is classified as obsolete. Both identified substitute parts—TLP785F(D4-LF7,F) and TLP785F(LF7,F)—are active products from the same manufacturer with identical electrical and mechanical specifications.

TLP785F(D4-LF7,F) is the direct manufacturer equivalent, maintaining the complete part number designation including the D4-LF7,F suffix. This part carries active product status and is recommended as the primary substitute for direct replacement applications.

TLP785F(LF7,F) is a parametric equivalent with identical performance characteristics. The difference in part number designation (absence of D4 prefix) reflects a variation in supplier device packaging notation. This part also carries active product status and is suitable for applications where the packaging variant is acceptable.

Both substitute parts comply with the same electrical isolation, switching performance, and thermal operating requirements as the original component. Selection between the two substitutes should be based on specific supplier availability and packaging requirements for the application.

Frequently Asked Questions (FAQ)

Q: Can TLP785F(D4-LF7,F) be used as a direct replacement for TLP781F(D4-LF7,F)?

A: Yes. The TLP785F(D4-LF7,F) maintains identical specifications across all critical parameters including isolation voltage (5000Vrms), current transfer ratio (50–600% @ 5mA), switching times (3µs on/off, 2µs/3µs rise/fall), output ratings (80V, 50mA), and package configuration (4-SMD, Gull Wing). The primary distinction is product status: TLP785F is active while TLP781F is obsolete.

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

A: Both parts are parametrically equivalent with identical electrical performance. The difference lies in the supplier device package designation. TLP785F(D4-LF7,F) includes the D4 prefix in the packaging notation, while TLP785F(LF7,F) does not. Both are surface mount 4-SMD packages with Gull Wing configuration. Selection depends on supplier availability and specific packaging requirements for your application.

Q: Are there any compatibility concerns when substituting these parts?

A: No compatibility concerns exist when substituting with either TLP785F variant. Both parts maintain identical pin configuration, package footprint (4-SMD, Gull Wing), electrical characteristics, and operating temperature range (-55°C ~ 110°C). Direct PCB layout compatibility is assured.

Q: What certifications and compliance standards apply to these substitute parts?

A: Both TLP785F variants carry ECCN classification EAR99 and HTSUS code 8541.49.8000, matching the original TLP781F component. Moisture sensitivity level is 1 (Unlimited) for all three parts, indicating no moisture sensitivity restrictions during storage or handling.

Q: Why is the TLP781F classified as obsolete?

A: The TLP781F(D4-LF7,F) is listed as obsolete by the manufacturer. The TLP785F series represents the active product line continuation with equivalent performance specifications. For new designs and ongoing production, TLP785F variants are the recommended components.