TLP781(D4BLL-LF6,F Equivalent & Substitute Parts

Part Overview

The TLP781(D4BLL-LF6,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. The part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLP781(D4BLL-LF6,F
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	200% @ 5mA
Current Transfer Ratio (Max)	400% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Operating Temperature	-55°C ~ 110°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the TLP781(D4BLL-LF6,F is determined by the following critical parameters:

Mandatory Matching Parameters:

Number of Channels: 1
Voltage - Isolation: 5000Vrms
Output Type: Transistor
Voltage - Output (Max): 80V
Current - Output / Channel: 50mA
Operating Temperature Range: -55°C ~ 110°C
Input Type: DC

Flexible Parameters (allowing substitution across variants):

Current Transfer Ratio range
Mounting Type (Surface Mount vs. Through Hole)
Package configuration
Turn On/Off Time and Rise/Fall Time specifications

Two substitute parts meet these criteria: TLP785(D4B-F6,F (through-hole variant) and TLP785(BLL-LF6,F (surface-mount variant with identical electrical characteristics).

Parameter Comparison

Parameter	TLP781(D4BLL-LF6,F	TLP785(D4B-F6,F	TLP785(BLL-LF6,F
Manufacturer	Toshiba	Toshiba	Toshiba
Number of Channels	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	200% @ 5mA	50% @ 5mA	200% @ 5mA
Current Transfer Ratio (Max)	400% @ 5mA	600% @ 5mA	400% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs
Output Type	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C
Mounting Type	Surface Mount	Through Hole	Surface Mount
Package / Case	4-SMD, Gull Wing	4-DIP (0.300", 7.62mm)	4-SMD, Gull Wing
Product Status	Obsolete	Active	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

TLP785(BLL-LF6,F is the primary equivalent for direct replacement of TLP781(D4BLL-LF6,F. Both components share identical surface-mount packaging (4-SMD, Gull Wing), matching current transfer ratio specifications (200% to 400% @ 5mA), and all critical electrical parameters. TLP785(BLL-LF6,F is currently in active production status, ensuring long-term availability and supply chain continuity.

TLP785(D4B-F6,F provides functional equivalence with the following considerations: it maintains all critical isolation voltage, output voltage, and current specifications. The primary difference is the through-hole 4-DIP package configuration, which requires PCB layout modification. The current transfer ratio minimum specification is lower (50% vs. 200%), though the maximum specification is higher (600% vs. 400%), providing broader operational tolerance. This variant is also in active production status.

Both substitute parts carry identical compliance certifications (ECCN: EAR99, HTSUS: 8541.49.8000) and moisture sensitivity ratings as the original component.

Frequently Asked Questions (FAQ)

Q: Can TLP785(BLL-LF6,F directly replace TLP781(D4BLL-LF6,F without PCB modification?

A: Yes. Both components use identical 4-SMD, Gull Wing surface-mount packaging and share matching electrical specifications for isolation voltage, output voltage, output current, and current transfer ratio range. No PCB layout changes are required.

Q: What is the key difference between TLP785(D4B-F6,F and TLP785(BLL-LF6,F?

A: The primary difference is packaging. TLP785(D4B-F6,F uses through-hole 4-DIP configuration, while TLP785(BLL-LF6,F uses surface-mount 4-SMD configuration. Electrical performance is equivalent for all critical parameters. Package selection depends on PCB assembly method and design requirements.

Q: Why is the current transfer ratio minimum specification different for TLP785(D4B-F6,F?

A: The TLP785(D4B-F6,F variant specifies a minimum current transfer ratio of 50% @ 5mA compared to 200% for the other variants. This represents a broader tolerance band for the through-hole package variant. The maximum specification (600%) remains higher, providing wider operational margin.

Q: Are all three components compatible with the same circuit design?

A: TLP781(D4BLL-LF6,F and TLP785(BLL-LF6,F are fully compatible without design changes. TLP785(D4B-F6,F requires PCB layout modification due to different package type (through-hole vs. surface-mount) but maintains electrical compatibility for all functional parameters.

Q: What is the product status significance for component selection?

A: TLP781(D4BLL-LF6,F is classified as obsolete, meaning production has ended. TLP785(BLL-LF6,F and TLP785(D4B-F6,F are both in active production status, ensuring continued availability, supply chain support, and manufacturing consistency for new designs and production runs.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message