TLP781(D4-Y,F) Equivalent & Substitute Parts

Part Overview

The TLP781(D4-Y,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation. The part is currently classified as obsolete, making identification of active equivalent alternatives essential for ongoing design support and procurement continuity.

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
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(D4-Y,F) is based on strict equivalence across the following critical parameters:

Single-channel configuration
5000Vrms isolation voltage
Transistor output topology
Current transfer ratio range: 50% to 150% @ 5mA
Maximum output voltage: 80V
Maximum output current: 50mA per channel
Vce saturation: 400mV maximum
Operating temperature range: -55°C to 110°C
4-DIP through-hole package (0.300", 7.62mm)
Moisture sensitivity level: 1 (Unlimited)

All substitute parts listed maintain identical electrical and mechanical specifications across these parameters. Differences in product status, packaging format (tube vs. standard), and manufacturing date codes do not affect functional equivalence.

Parameter Comparison

Parameter	TLP781(D4-Y,F)	TLP785(D4-Y,F)	TLP785(D4-Y-F6,F)	TLP785(Y,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
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
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)
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	Not specified	Not specified	RoHS Compliant	Not specified

Engineering Selection Recommendations

All listed TLP785 variants are direct functional equivalents to the obsolete TLP781(D4-Y,F). Selection among the active alternatives 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(D4-Y,F).

Compliance Certification: TLP785(Y,F) is explicitly certified as RoHS Compliant. This variant is recommended for applications subject to RoHS regulatory requirements or environmental compliance mandates.

Packaging Format: TLP785(Y,F) is supplied in Tube packaging, while other variants use standard packaging. Tube packaging may be preferred for automated assembly processes or high-volume production environments.

Manufacturing Variants: TLP785(D4-Y-F6,F) and TLP785(Y-LF6,F) represent manufacturing date code or lead-free variants. These designations do not alter electrical performance but may reflect manufacturing process improvements or supply chain specifications.

Frequently Asked Questions (FAQ)

Q: Can TLP785 series parts directly replace TLP781(D4-Y,F) in existing designs?

A: Yes. All TLP785 variants listed maintain identical electrical specifications and 4-DIP through-hole package dimensions. No circuit modifications are required for substitution.

Q: What is the difference between TLP785(D4-Y,F), TLP785(D4-Y-F6,F), TLP785(Y,F), and TLP785(Y-LF6,F)?

A: These variants differ only in manufacturing date codes, packaging format (tube vs. standard), and lead-free processing designations. Electrical and mechanical performance is identical across all variants.

Q: Is RoHS compliance a factor in selecting a substitute?

A: RoHS compliance is relevant only if your application or regulatory environment requires it. TLP785(Y,F) is explicitly RoHS Compliant. Other variants do not specify RoHS status but are functionally equivalent.

Q: Are there any pin-out or footprint differences between TLP781(D4-Y,F) and TLP785 substitutes?

A: No. All parts use the same 4-DIP (0.300", 7.62mm) through-hole package with identical pin assignments and PCB footprint requirements.

Q: What inventory levels are available for each substitute part?

A: Current inventory levels are: TLP785(D4-Y,F) – 975 Pcs; TLP785(D4-Y-F6,F) – 1016 Pcs; TLP785(Y,F) – 966 Pcs; TLP785(Y-LF6,F) – 822 Pcs.

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