TLP781(D4-GR-FD,F) Equivalent & Substitute Parts

Part Overview

The TLP781(D4-GR-FD,F) is a Toshiba optoisolator with transistor output, rated for 5000Vrms isolation voltage in a 4-DIP through-hole package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part delivers 1-channel isolation with DC input and transistor output configuration, suitable for applications requiring high-voltage galvanic isolation.

Substiute Parts

TLP781(D4-GR-FD,F)

Toshiba Semiconductor and StorageIn Stock: 1182TLP781(D4-GR-FD,F) Datasheet

Current PartRFQ

TLP785(D4-GR,F

Toshiba Semiconductor and StorageIn Stock: 1032TLP785(D4-GR,F Datasheet

SimilarRFQ

TLP785(D4-GRL,F

Toshiba Semiconductor and StorageIn Stock: 47257TLP785(D4-GRL,F Datasheet

Parametric EquivalentRFQ

TLP785(D4GR-F6,F

Toshiba Semiconductor and StorageIn Stock: 1167TLP785(D4GR-F6,F Datasheet

Parametric EquivalentRFQ

TLP785(GR,F)

Toshiba Semiconductor and StorageIn Stock: 3126TLP785(GR,F) Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TLP781(D4-GR-FD,F) is based on the following critical parameters that must remain constant:

• Voltage - Isolation: 5000Vrms
• Number of Channels: 1
• Output Type: Transistor
• Package / Case: 4-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Input Type: DC
• Operating Temperature Range: -55°C ~ 110°C

The TLP785 series from Toshiba meets these requirements. Substitute parts are grouped into two categories:

Direct Substitutes (Parametric Equivalents): Parts with identical Current Transfer Ratio specifications (100% Min, 300% Max @ 5mA), matching the original part's performance envelope.

Compatible Substitutes: Parts with broader Current Transfer Ratio ranges (50% Min, 600% Max @ 5mA) that encompass the original specification, suitable for applications where the wider tolerance band is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Preferred Substitutes (Parametric Equivalents):

TLP785(D4-GRL,F), TLP785(D4GR-F6,F), and TLP785(GR,F) are direct parametric equivalents with identical Current Transfer Ratio specifications (100% Min, 300% Max @ 5mA). These parts maintain the original performance envelope and are classified as active products. TLP785(D4-GRL,F) offers the highest inventory availability (47,200 pcs), making it the primary recommendation for new designs and production continuity.

Compatible Alternative:

TLP785(D4-GR,F) operates within a broader Current Transfer Ratio range (50% Min, 600% Max @ 5mA) that encompasses the original specification. This part is ROHS3 compliant and carries active product status. Selection of this part is appropriate when the wider tolerance band meets circuit requirements.

All substitute parts maintain identical isolation voltage (5000Vrms), package configuration (4-DIP through-hole), and thermal operating range (-55°C ~ 110°C) as the original TLP781(D4-GR-FD,F).

Frequently Asked Questions (FAQ)

Q: Can TLP785(D4-GR,F) replace TLP781(D4-GR-FD,F) in existing designs?

A: TLP785(D4-GR,F) is functionally compatible. The key difference is the Current Transfer Ratio range: TLP785(D4-GR,F) specifies 50% to 600% @ 5mA versus the original 100% to 300% @ 5mA. If your circuit design accommodates this broader tolerance band, substitution is valid. All other electrical and mechanical parameters are identical.

Q: What is the difference between TLP785(D4-GRL,F) and TLP785(GR,F)?

A: Both parts are parametric equivalents with identical electrical specifications. The primary difference is packaging: TLP785(D4-GRL,F) is supplied in standard packaging, while TLP785(GR,F) is supplied in tube packaging. Electrical performance and pin configuration are identical. Selection depends on your procurement and assembly requirements.

Q: Are all substitute parts RoHS compliant?

A: TLP785(D4-GR,F) is ROHS3 compliant, and TLP785(GR,F) is RoHS compliant. TLP785(D4-GRL,F) and TLP785(D4GR-F6,F) do not specify RoHS status in the provided data. Verify RoHS compliance requirements with your supply chain if this is a design constraint.

Q: Why is TLP781(D4-GR-FD,F) marked as obsolete?

A: The original part is classified as obsolete by the manufacturer. The TLP785 series provides active, production-supported alternatives with equivalent or superior specifications. Migration to TLP785 variants ensures long-term supply availability and design continuity.

Q: Can I use TLP785(D4-GR,F) if my circuit requires the tighter Current Transfer Ratio specification?

A: No. If your circuit design requires the 100% to 300% @ 5mA Current Transfer Ratio envelope, use TLP785(D4-GRL,F), TLP785(D4GR-F6,F), or TLP785(GR,F). These parts maintain the original specification. TLP785(D4-GR,F) with its 50% to 600% range may introduce circuit performance variations outside your design tolerance.