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

Part Overview

The TLP781F(D4-BLL,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 package. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations. Active alternatives from both Toshiba and third-party manufacturers are available with identical or superior electrical characteristics.

Substiute Parts

TLP781F(D4-BLL,F)

Toshiba Semiconductor and StorageIn Stock: 5944TLP781F(D4-BLL,F) Datasheet

Current PartRFQ

TLP785F(D4-BLL,F

Toshiba Semiconductor and StorageIn Stock: 1055TLP785F(D4-BLL,F Datasheet

DirectRFQ

TLP785F(BL-LF7,F

Toshiba Semiconductor and StorageIn Stock: 763TLP785F(BL-LF7,F Datasheet

Parametric EquivalentRFQ

TLP785F(BLL,F

Toshiba Semiconductor and StorageIn Stock: 944TLP785F(BLL,F Datasheet

Parametric EquivalentRFQ

TLP785F(BLL-F7,F

Toshiba Semiconductor and StorageIn Stock: 956TLP785F(BLL-F7,F Datasheet

Parametric EquivalentRFQ

EL816(M)(C)

Everlight Electronics Co LtdIn Stock: 1016EL816(M)(C) Datasheet

Parametric EquivalentRFQ

EL816(M)(C)-V

Everlight Electronics Co LtdIn Stock: 1214EL816(M)(C)-V Datasheet

Parametric EquivalentRFQ

EL817(M)(C)-G

Everlight Electronics Co LtdIn Stock: 959EL817(M)(C)-G Datasheet

Parametric EquivalentRFQ

EL817(M)(C)-VG

Everlight Electronics Co LtdIn Stock: 845EL817(M)(C)-VG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLP781F(D4-BLL,F) is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Voltage - Isolation: 5000Vrms
• Number of Channels: 1
• Output Type: Transistor
• Input Type: DC
• Package / Case: 4-DIP (0.400", 10.16mm)
• Mounting Type: Through Hole
• Operating Temperature Range: -55°C ~ 110°C

Electrical Performance Parameters:

• Current Transfer Ratio: 200% - 400% @ 5mA
• Voltage - Output (Max): 80V
• Current - Output / Channel: 50mA
• Current - DC Forward (If) (Max): 60mA

Substitute parts are grouped into two categories:

Direct Toshiba Alternatives (TLP785F Series): These components maintain identical electrical specifications and package configuration while offering active product status. All variants use the same base product number TLP785 with different packaging designations.

Cross-Manufacturer Equivalents (Everlight EL816/EL817 Series): These optoisolators meet all mandatory electrical and mechanical parameters. Minor variations in timing characteristics (Rise/Fall Time) and Vce Saturation do not affect functional compatibility in standard isolation applications.

Parameter Comparison

Engineering Selection Recommendations

Toshiba TLP785F Series (Preferred for Direct Replacement): The TLP785F variants—TLP785F(D4-BLL,F), TLP785F(BL-LF7,F), TLP785F(BLL,F), and TLP785F(BLL-F7,F)—are the primary substitutes for the obsolete TLP781F(D4-BLL,F). All four variants maintain identical electrical specifications and 4-DIP package configuration. These parts carry active product status from Toshiba, ensuring long-term availability and supply chain stability. The packaging designations reflect different lead frame and tape-reel configurations but do not affect electrical performance or pinout compatibility.

Everlight EL816 and EL817 Series (Cross-Manufacturer Alternatives): The Everlight EL816(M)(C), EL816(M)(C)-V, EL817(M)(C)-G, and EL817(M)(C)-VG optoisolators provide functional equivalence with all mandatory electrical and mechanical parameters matched to the TLP781F(D4-BLL,F). These components are ROHS3 compliant and carry active product status. The EL816 variants exhibit faster rise/fall times (4µs, 3µs) compared to the original specification (2µs, 3µs), while EL817 variants show slower timing (6µs, 8µs). All Everlight alternatives feature improved Vce Saturation performance (200mV maximum versus 400mV), which provides enhanced switching characteristics. These parts are suitable for applications where cross-manufacturer sourcing is acceptable.

Inventory Availability: Current stock levels across all substitute parts range from 707 to 1135 units, providing adequate supply for both prototype and production quantities.

Frequently Asked Questions (FAQ)

Q: Can I directly replace TLP781F(D4-BLL,F) with TLP785F variants without circuit modification?

A: Yes. All TLP785F variants maintain identical pinout, electrical specifications, and 4-DIP package dimensions. No circuit modifications are required. The packaging designations (D4-BLL,F), (BL-LF7,F), (BLL,F), and (BLL-F7,F) reflect manufacturing and delivery format differences only and do not affect electrical performance or compatibility.

Q: What are the differences between Toshiba TLP785F and Everlight EL816/EL817 substitutes?

A: All parts meet the core isolation voltage (5000Vrms), current transfer ratio (200%-400% @ 5mA), output voltage (80V max), and output current (50mA) specifications. Differences exist in timing characteristics and saturation voltage. Toshiba TLP785F maintains the original turn-on/turn-off times (3µs, 3µs) and rise/fall times (2µs, 3µs). Everlight EL816 offers faster rise time (4µs, 3µs) while EL817 provides slower timing (6µs, 8µs). Everlight parts feature lower Vce Saturation (200mV versus 400mV), which improves switching performance. All parts are functionally compatible in standard isolation applications.

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

A: Everlight EL816 and EL817 variants carry ROHS3 compliance certification. Toshiba TLP785F variants do not list explicit RoHS status in the provided specifications. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating. For applications requiring specific environmental or regulatory compliance, consult detailed product datasheets and certification documentation.

Q: Which substitute should I select for new designs?

A: For new designs, select from the active Toshiba TLP785F series to maintain manufacturer continuity and ensure long-term support. The TLP785F(BLL,F) variant offers the highest current inventory (850 units). If cross-manufacturer sourcing is acceptable and improved saturation voltage performance is beneficial, Everlight EL816(M)(C)-V or EL817(M)(C)-VG are suitable alternatives with ROHS3 compliance.

Q: Are the 4-DIP package dimensions identical across all substitute parts?

A: Yes. All substitute parts use the 4-DIP (0.400", 10.16mm) package with through-hole mounting. PCB footprints and board layouts are directly compatible without modification.

Q: What is the significance of the packaging designations in TLP785F part numbers?

A: The suffixes (D4-BLL,F), (BL-LF7,F), (BLL,F), and (BLL-F7,F) indicate different lead frame materials, plating specifications, and tape-reel packaging formats used by Toshiba for manufacturing and distribution. These designations do not affect electrical performance, pinout, or functional compatibility. Selection among these variants depends on procurement and supply chain requirements rather than technical specifications.