TLP781(Y-LF6,F) Equivalent & Substitute Parts

Part Overview

The TLP781(Y-LF6,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage in a 4-SMD surface mount package. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity. Active alternatives with identical or compatible electrical characteristics are available to maintain system functionality.

Key Parameters

Parameter	Value
Manufacturer	Toshiba Semiconductor and Storage
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	150% @ 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 of the TLP781(Y-LF6,F) is determined by the following critical parameters:

Isolation Voltage: 5000Vrms (mandatory match)
Number of Channels: 1 channel (mandatory match)
Output Type: Transistor output (mandatory match)
Current Transfer Ratio: 50% to 150% @ 5mA (mandatory match)
Maximum Output Voltage: 80V (mandatory match)
Maximum Output Current: 50mA per channel (mandatory match)
Operating Temperature Range: -55°C ~ 110°C (mandatory match)
Input Type: DC (mandatory match)

Substitute parts are classified into two categories:

Direct Manufacturer Substitute: Parts from the same manufacturer with identical electrical specifications but different packaging or product status.

Parametric Equivalent: Parts with identical electrical and thermal characteristics that maintain full functional compatibility regardless of package variation.

Parameter Comparison

Parameter	TLP781(Y-LF6,F)	TLP785(Y-LF6,F)	TLP785F(Y-LF7,F)
Manufacturer	Toshiba	Toshiba	Toshiba
Number of Channels	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	150% @ 5mA	150% @ 5mA	150% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs
Input Type	DC	DC	DC
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)
ECCN	EAR99	EAR99	EAR99
HTSUS	8541.49.8000	8541.49.8000	8541.49.8000

Engineering Selection Recommendations

TLP785F(Y-LF7,F) is the primary substitute for the obsolete TLP781(Y-LF6,F). Both components share identical electrical specifications, isolation voltage, output characteristics, and thermal operating range. The TLP785F maintains the same 4-SMD surface mount package configuration, enabling direct board-level compatibility without PCB redesign. This part carries active product status, ensuring long-term availability and supply chain continuity.

TLP785(Y-LF6,F) provides an alternative with full electrical equivalence but requires package accommodation. This part uses a 4-DIP through-hole configuration instead of surface mount. Selection of this substitute is appropriate only when through-hole mounting is acceptable or preferred in the application. The part maintains active status and identical electrical performance.

Both substitutes comply with the same export control classifications (ECCN: EAR99) and tariff codes (HTSUS: 8541.49.8000) as the original component, with MSL rating of 1 (Unlimited) for moisture sensitivity.

Frequently Asked Questions (FAQ)

Q: Can TLP785F(Y-LF7,F) be used as a direct replacement for TLP781(Y-LF6,F) without PCB modification?

A: Yes. Both components feature identical electrical specifications, isolation voltage (5000Vrms), output characteristics (80V max, 50mA per channel), and 4-SMD surface mount packaging. No PCB redesign is required.

Q: What is the difference between TLP785(Y-LF6,F) and TLP785F(Y-LF7,F)?

A: Both parts are electrically identical with matching isolation voltage, current transfer ratio, output voltage, and operating temperature range. The primary difference is packaging: TLP785(Y-LF6,F) uses 4-DIP through-hole configuration, while TLP785F(Y-LF7,F) uses 4-SMD surface mount configuration. Selection depends on board assembly requirements.

Q: Why is the TLP781(Y-LF6,F) listed as obsolete?

A: The TLP781(Y-LF6,F) has been discontinued by the manufacturer. Active alternatives with identical electrical performance are available to support ongoing production and design requirements.

Q: Are all three parts from the same manufacturer?

A: Yes. TLP781(Y-LF6,F), TLP785(Y-LF6,F), and TLP785F(Y-LF7,F) are all manufactured by Toshiba Semiconductor and Storage.

Q: What are the critical parameters that must match for substitution?

A: Substitution requires matching isolation voltage (5000Vrms), number of channels (1), output type (transistor), current transfer ratio (50-150% @ 5mA), maximum output voltage (80V), maximum output current (50mA), operating temperature range (-55°C ~ 110°C), and input type (DC).

Q: Can I use TLP785(Y-LF6,F) in a surface mount assembly?

A: No. TLP785(Y-LF6,F) is a through-hole component with 4-DIP packaging. For surface mount applications, use TLP785F(Y-LF7,F), which provides identical electrical specifications in 4-SMD configuration.

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