TLP781(BLL,F) Equivalent & Substitute Parts

Part Overview

The TLP781(BLL,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation and is housed in a 4-DIP package. The part is currently classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Active alternatives with identical or compatible electrical and mechanical specifications are available from both Toshiba and Everlight Electronics.

Substiute Parts

TLP781(BLL,F)

Toshiba Semiconductor and StorageIn Stock: 848TLP781(BLL,F) Datasheet

Current PartRFQ

TLP785(BLL,F

Toshiba Semiconductor and StorageIn Stock: 901TLP785(BLL,F Datasheet

DirectRFQ

TLP785(D4-BLL,F

Toshiba Semiconductor and StorageIn Stock: 6796TLP785(D4-BLL,F Datasheet

Parametric EquivalentRFQ

EL816(C)

Everlight Electronics Co LtdIn Stock: 831EL816(C) Datasheet

Parametric EquivalentRFQ

EL816(C)-V

Everlight Electronics Co LtdIn Stock: 4543EL816(C)-V Datasheet

Parametric EquivalentRFQ

EL817(C)-G

Everlight Electronics Co LtdIn Stock: 1224EL817(C)-G Datasheet

Parametric EquivalentRFQ

EL817(C)-VG

Everlight Electronics Co LtdIn Stock: 847EL817(C)-VG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLP781(BLL,F) are qualified based on the following critical parameters that determine functional compatibility:

• Voltage - Isolation: 5000Vrms (mandatory match)
• Number of Channels: 1 (mandatory match)
• Output Type: Transistor (mandatory match)
• Package / Case: 4-DIP (0.300", 7.62mm) (mandatory match)
• Mounting Type: Through Hole (mandatory match)
• Current Transfer Ratio Range: 200% to 400% @ 5mA (mandatory match)
• Voltage - Output (Max): 80V (mandatory match)
• Current - Output / Channel: 50mA (mandatory match)
• Operating Temperature Range: -55°C ~ 110°C (mandatory match)

All substitute parts listed meet these electrical and mechanical requirements. Variations in turn-on/turn-off time, rise/fall time, forward voltage, and saturation voltage are within acceptable tolerances for this component category and do not affect functional substitution.

Parameter Comparison

Engineering Selection Recommendations

Toshiba TLP785 Series (Direct Manufacturer Alternatives)

The TLP785(BLL,F) and TLP785(D4-BLL,F) are active Toshiba products that provide direct electrical equivalence to the obsolete TLP781(BLL,F). Both variants maintain identical isolation voltage, current transfer ratio specifications, and switching characteristics. The TLP785(D4-BLL,F) offers higher inventory availability (6690 units) compared to TLP785(BLL,F) (798 units), making it the preferred choice for production continuity when sourcing from the original manufacturer.

Everlight EL816 and EL817 Series (Cross-Manufacturer Alternatives)

The EL816(C), EL816(C)-V, EL817(C)-G, and EL817(C)-VG optoisolators from Everlight Electronics provide parametric equivalence with all mandatory electrical and mechanical specifications matching the TLP781(BLL,F). These parts are ROHS3 compliant and carry active product status. The EL816 variants exhibit faster rise/fall times (4µs, 3µs) and lower saturation voltage (200mV) compared to the TLP781 specification, while EL817 variants have slower switching characteristics (6µs, 8µs). Selection between EL816 and EL817 depends on application timing requirements. The EL816(C)-V offers the highest inventory level (4500 units) among Everlight alternatives.

Frequently Asked Questions (FAQ)

Q: Can TLP785(BLL,F) directly replace TLP781(BLL,F) in existing designs?

A: Yes. The TLP785(BLL,F) is a direct Toshiba equivalent with identical electrical specifications, isolation voltage, current transfer ratio, output voltage/current ratings, and 4-DIP package configuration. No circuit modifications are required.

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

A: Both parts are parametrically identical. The designation difference reflects internal packaging or manufacturing variants. Both are suitable substitutes for the TLP781(BLL,F). Selection may be based on inventory availability or supplier preference.

Q: Are Everlight EL816 and EL817 parts suitable for direct replacement?

A: Yes, both EL816 and EL817 series meet all mandatory electrical and mechanical requirements for substitution. The primary differences are in switching speed characteristics. EL816 variants have faster rise/fall times (4µs, 3µs) and lower saturation voltage (200mV), while EL817 variants have slower switching (6µs, 8µs). Application timing requirements determine which variant is appropriate.

Q: Does the choice between EL816(C) and EL816(C)-V affect compatibility?

A: No. Both variants are parametrically equivalent. The designation difference reflects packaging or distribution format. EL816(C) is supplied in tube packaging, while EL816(C)-V has different packaging specifications. Electrical performance is identical.

Q: Are all substitute parts RoHS compliant?

A: The Everlight EL816 and EL817 series are ROHS3 compliant. Toshiba TLP785 variants do not specify RoHS status in the provided data. Compliance verification should be confirmed with the supplier if RoHS certification is a design requirement.

Q: What inventory considerations apply to these substitutes?

A: TLP785(D4-BLL,F) offers the highest availability (6690 units), followed by EL816(C)-V (4500 units). TLP785(BLL,F) and EL817(C)-VG have moderate availability (798 and 777 units respectively). EL816(C) and EL817(C)-G have lower stock levels (784 and 1151 units). Procurement strategy should account for production volume requirements and lead time constraints.