TLP781(D4GRLL6TC,F Equivalent & Substitute Parts

Part Overview

The TLP781(D4GRLL6TC,F is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage and is housed in a 4-DIP through-hole package. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations.

Substiute Parts

TLP781(D4GRLL6TC,F

Toshiba Semiconductor and StorageIn Stock: 1015TLP781(D4GRLL6TC,F Datasheet

Current PartRFQ

TLP785(D4GL-F6,F

Toshiba Semiconductor and StorageIn Stock: 1174TLP785(D4GL-F6,F Datasheet

SimilarRFQ

VO617C-3X001

Vishay Semiconductor Opto DivisionIn Stock: 1260VO617C-3X001 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLP781(D4GRLL6TC,F are identified based on the following critical parameters that determine functional compatibility:

Primary Matching Criteria:

• Single-channel configuration
• Transistor output topology
• 4-DIP through-hole package (0.300", 7.62mm)
• Isolation voltage ≥ 5000Vrms
• Maximum output voltage of 80V
• Maximum output current of 50mA per channel
• Operating temperature range of -55°C ~ 110°C
• DC input type

Acceptable Parameter Variations:

• Current Transfer Ratio (CTR) range: minimum 50% @ 5mA or higher; maximum 200% @ 5mA or higher
• Turn-on/turn-off time: up to 3µs typical
• Rise/fall time: up to 3µs typical
• Forward voltage (Vf): 1.1V to 1.15V typical
• Vce saturation: 400mV maximum

Parts meeting these criteria are classified as direct substitutes for the obsolete TLP781(D4GRLL6TC,F.

Parameter Comparison

Engineering Selection Recommendations

TLP785(D4GL-F6,F is an active substitute manufactured by Toshiba. This part maintains identical isolation voltage, output voltage, output current, and operating temperature specifications. The TLP785 series offers a wider current transfer ratio range (50% to 600% @ 5mA) compared to the TLP781 (100% to 200% @ 5mA), providing greater design flexibility. Timing characteristics remain equivalent. The active product status ensures ongoing availability and manufacturing support.

VO617C-3X001 is an active parametric equivalent manufactured by Vishay Semiconductor Opto Division. This part exceeds the isolation voltage requirement at 5300Vrms and maintains identical output voltage, output current, and operating temperature specifications. The current transfer ratio range (100% to 200% @ 5mA) matches the original TLP781 specification. Turn-on time is slightly longer at 6µs typical compared to 3µs for the TLP781, while turn-off time is faster at 4µs. The active product status and alternative packaging option (Tape & Reel) support modern manufacturing workflows.

Both substitute parts are suitable for direct replacement in applications where the TLP781(D4GRLL6TC,F is no longer available, provided that the timing characteristics of the VO617C-3X001 are acceptable for the specific application.

Frequently Asked Questions (FAQ)

Q: Can the TLP785(D4GL-F6,F directly replace the TLP781(D4GRLL6TC,F in existing designs?

A: Yes. Both parts share identical isolation voltage (5000Vrms), output voltage (80V maximum), output current (50mA), operating temperature range (-55°C ~ 110°C), and 4-DIP package specifications. The TLP785 offers a broader current transfer ratio range, which is compatible with TLP781 applications.

Q: What is the key difference between the TLP785(D4GL-F6,F and VO617C-3X001?

A: The primary difference is timing performance. The TLP785 maintains the original TLP781 timing characteristics (3µs turn-on, 3µs turn-off). The VO617C-3X001 has slightly longer turn-on time (6µs) but faster turn-off time (4µs). The VO617C-3X001 also provides higher isolation voltage (5300Vrms vs. 5000Vrms). Component selection depends on timing requirements of the specific application.

Q: Are there packaging differences between these substitutes?

A: The TLP785(D4GL-F6,F uses standard DIP packaging. The VO617C-3X001 is supplied in Tape & Reel (TR) packaging, which is standard for automated assembly processes. Both parts use the same 4-DIP (0.300", 7.62mm) footprint and are through-hole mounted, ensuring PCB compatibility.

Q: Why is the TLP781(D4GRLL6TC,F classified as obsolete?

A: The TLP781 has reached end-of-life status with the manufacturer. The TLP785 series represents the current active product line from Toshiba for single-channel optoisolators with equivalent specifications.

Q: Can I use the VO617C-3X001 in high-speed switching applications?

A: The VO617C-3X001 has a turn-on time of 6µs compared to 3µs for the TLP781 and TLP785. Applications requiring faster switching response should use the TLP785(D4GL-F6,F to maintain original timing performance.

Q: Are all three parts RoHS compliant?

A: Compliance information is not provided in the component specifications. Verify RoHS and other regulatory compliance requirements with the respective manufacturers or authorized distributors before final component selection.