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TLP781F(LF7,F) Equivalent & Substitute Parts
Part Overview
The TLP781F(LF7,F) is an optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides galvanic isolation up to 5000Vrms in a single-channel configuration with 4-SMD surface mount packaging. The part is currently classified as obsolete, making identification of equivalent alternatives necessary for ongoing design support and procurement continuity.
Substiute Parts
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) | 600% @ 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 |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the TLP781F(LF7,F) is determined by strict equivalence across 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 Range: 50% to 600% @ 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)
- Package Configuration: 4-SMD, Gull Wing surface mount (mandatory match)
The substitute parts identified below meet all these electrical and mechanical parameters. The primary distinction between the main part and substitutes is product status: the TLP781F(LF7,F) is obsolete, while the identified alternatives remain in active production.
Parameter Comparison
| Parameter | TLP781F(LF7,F) | TLP785F(LF7,F) | TLP785F(D4-LF7,F) |
|---|---|---|---|
| Manufacturer | Toshiba | Toshiba | Toshiba |
| Product Status | Obsolete | Active | Active |
| 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) | 600% @ 5mA | 600% @ 5mA | 600% @ 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 | Surface Mount | Surface Mount |
| Package / Case | 4-SMD, Gull Wing | 4-SMD, Gull Wing | 4-SMD, Gull Wing |
| 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
Both TLP785F(LF7,F) and TLP785F(D4-LF7,F) are direct parametric equivalents to the obsolete TLP781F(LF7,F). Selection between the two active alternatives should be based on product availability and procurement lead times, as both maintain identical electrical specifications and mechanical compatibility.
The TLP785F(D4-LF7,F) variant currently shows higher inventory availability (1095 units) compared to TLP785F(LF7,F) (873 units), which may influence procurement decisions for high-volume applications.
Both substitute parts carry identical export compliance classifications (ECCN: EAR99, HTSUS: 8541.49.8000) and moisture sensitivity ratings (MSL 1), ensuring regulatory and handling requirements remain unchanged from the original design.
Frequently Asked Questions (FAQ)
Q: Can TLP785F(LF7,F) or TLP785F(D4-LF7,F) be used as direct replacements for TLP781F(LF7,F)?
A: Yes. Both parts are parametric equivalents meeting all electrical and mechanical specifications of the original part. The primary difference is product status: TLP781F(LF7,F) is obsolete, while both TLP785F variants are in active production.
Q: What is the difference between TLP785F(LF7,F) and TLP785F(D4-LF7,F)?
A: Both variants share identical electrical parameters and package specifications. The designation difference reflects internal Toshiba product coding. From an engineering perspective, they are functionally equivalent for circuit design purposes.
Q: Are there any package or pinout differences between these parts?
A: No. All three parts use identical 4-SMD, Gull Wing surface mount packaging with the same pin configuration and mechanical footprint.
Q: What isolation voltage do these optoisolators provide?
A: All parts in this comparison provide 5000Vrms galvanic isolation, suitable for high-voltage isolation applications.
Q: Are moisture sensitivity or handling requirements different between the main part and substitutes?
A: No. All parts carry MSL 1 (Unlimited) rating, indicating no special moisture control requirements during storage or handling.
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