TLP781(Y,F) Equivalent & Substitute Parts

Part Overview

The TLP781(Y,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 in 4-DIP through-hole packaging. The TLP781(Y,F) is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement.

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
Voltage - Forward (Vf) (Typ)	1.15V
Current - DC Forward (If) (Max)	60mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 110°C
Package / Case	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TLP781(Y,F) is determined by strict equivalence across the following critical parameters:

Single-channel configuration
5000Vrms isolation voltage
Current transfer ratio range: 50% to 150% @ 5mA
Transistor output topology
Maximum output voltage: 80V
Maximum output current: 50mA per channel
Forward voltage: 1.15V typical
Maximum forward current: 60mA
Vce saturation: 400mV maximum
Operating temperature range: -55°C to 110°C
4-DIP through-hole package (0.300", 7.62mm)

All identified substitute parts maintain identical electrical and mechanical specifications. Differences in part numbering reflect packaging variants, lead-free designations, and manufacturing date codes rather than functional performance changes.

Parameter Comparison

Parameter	TLP781(Y,F)	TLP785(Y,F)	TLP785(D4-Y,F)	TLP785(D4-Y-F6,F)	TLP785(Y-LF6,F)
Product Status	Obsolete	Active	Active	Active	Active
Number of Channels	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	150% @ 5mA	150% @ 5mA	150% @ 5mA	150% @ 5mA	150% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs
Rise / Fall Time (Typ)	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs	2µs, 3µs
Input Type	DC	DC	DC	DC	DC
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.15V	1.15V	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	60mA	60mA	60mA	60mA	60mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C
Package / Case	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99	EAR99	EAR99	EAR99
HTSUS	8541.49.8000	8541.49.8000	8541.49.8000	8541.49.8000	8541.49.8000

Engineering Selection Recommendations

All TLP785 variants listed are direct functional equivalents to the obsolete TLP781(Y,F). Selection among active substitute parts should be based on the following criteria:

Product Status: All substitute parts carry Active product status, ensuring long-term availability and manufacturing support compared to the Obsolete TLP781(Y,F).

Compliance and Certifications: The TLP785(Y,F) variant includes RoHS Compliant designation. All parts maintain identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications.

Packaging Variants: The TLP785(D4-Y,F) and TLP785(D4-Y-F6,F) designations indicate specific manufacturing date codes and lead-free processing. The TLP785(Y-LF6,F) designation reflects additional lead-free compliance markers. These designations do not alter electrical performance or mechanical compatibility.

Inventory Availability: Current stock levels range from 822 to 1084 pieces across all substitute variants, supporting immediate procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can TLP785 series parts directly replace TLP781(Y,F) in existing designs?

A: Yes. All TLP785 variants maintain identical electrical specifications, isolation voltage, output characteristics, and 4-DIP through-hole package dimensions. No circuit modifications are required.

Q: What do the suffixes in part numbers like (D4-Y,F) and (Y-LF6,F) indicate?

A: These suffixes denote manufacturing date codes, lead-free processing designations, and packaging variants. They do not affect electrical performance or functional compatibility.

Q: Are there differences in RoHS compliance among the substitute parts?

A: The TLP785(Y,F) variant explicitly carries RoHS Compliant status. All parts maintain identical ECCN and HTSUS classifications. Consult specific datasheets for detailed compliance documentation if required for your application.

Q: What is the moisture sensitivity level for these optoisolators?

A: All parts, including the original TLP781(Y,F) and all TLP785 substitutes, carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage or handling.

Q: Can I mix different TLP785 variants in the same production run?

A: Yes. All TLP785 variants are parametrically equivalent and interchangeable. Mixing variants does not affect circuit performance or reliability.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by: single-channel configuration, 5000Vrms isolation, 50-150% current transfer ratio at 5mA, transistor output topology, 80V maximum output voltage, 50mA maximum output current, 4-DIP through-hole package, and -55°C to 110°C operating temperature range.

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