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TLP781F(Y-LF7,F) Equivalent & Substitute Parts
Part Overview
The TLP781F(Y-LF7,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 surface mount configurations. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and component procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | TLP781F(Y-LF7,F) |
| 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 |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the TLP781F(Y-LF7,F) is determined by strict equivalence across the following critical parameters:
- Isolation Voltage: 5000Vrms (primary isolation specification)
- Number of Channels: 1 (single-channel configuration)
- Output Type: Transistor (output topology)
- Current Transfer Ratio Range: 50% to 150% @ 5mA (transfer characteristic)
- Maximum Output Voltage: 80V (output rating)
- Maximum Output Current: 50mA per channel (current capacity)
- Package Type: 4-SMD, Gull Wing (physical and electrical interface)
- Input Type: DC (signal type)
The TLP785F(Y-LF7,F) meets all these criteria and is classified as an active product, making it a direct functional equivalent for the obsolete TLP781F(Y-LF7,F).
Parameter Comparison
| Parameter | TLP781F(Y-LF7,F) | TLP785F(Y-LF7,F) | Match |
|---|---|---|---|
| Manufacturer | Toshiba Semiconductor and Storage | Toshiba Semiconductor and Storage | ✓ |
| Number of Channels | 1 | 1 | ✓ |
| Voltage - Isolation | 5000Vrms | 5000Vrms | ✓ |
| Current Transfer Ratio (Min) | 50% @ 5mA | 50% @ 5mA | ✓ |
| Current Transfer Ratio (Max) | 150% @ 5mA | 150% @ 5mA | ✓ |
| Turn On / Turn Off Time (Typ) | 3µs, 3µs | 3µs, 3µs | ✓ |
| Rise / Fall Time (Typ) | 2µs, 3µs | 2µs, 3µs | ✓ |
| Input Type | DC | DC | ✓ |
| Output Type | Transistor | Transistor | ✓ |
| Voltage - Output (Max) | 80V | 80V | ✓ |
| Current - Output / Channel | 50mA | 50mA | ✓ |
| Voltage - Forward (Vf) (Typ) | 1.15V | 1.15V | ✓ |
| Current - DC Forward (If) (Max) | 60 mA | 60 mA | ✓ |
| Vce Saturation (Max) | 400mV | 400mV | ✓ |
| Operating Temperature | -55°C ~ 110°C | -55°C ~ 110°C | ✓ |
| Mounting Type | Surface Mount | Surface Mount | ✓ |
| Package / Case | 4-SMD, Gull Wing | 4-SMD, Gull Wing | ✓ |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | ✓ |
| Product Status | Obsolete | Active | — |
Engineering Selection Recommendations
The TLP785F(Y-LF7,F) is the direct substitute for the obsolete TLP781F(Y-LF7,F). All electrical parameters, mechanical specifications, and environmental ratings are identical. Both components carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications, confirming regulatory equivalence.
The primary distinction is product status: TLP785F(Y-LF7,F) is actively manufactured and supported, while TLP781F(Y-LF7,F) is obsolete. For new designs or component replenishment, TLP785F(Y-LF7,F) is the appropriate selection. Existing designs using TLP781F(Y-LF7,F) can transition to TLP785F(Y-LF7,F) without circuit modification, as all functional and physical characteristics remain unchanged.
Frequently Asked Questions (FAQ)
Q: Can TLP785F(Y-LF7,F) be used as a direct replacement for TLP781F(Y-LF7,F) in existing designs?
A: Yes. All electrical parameters, timing characteristics, output ratings, and package specifications are identical. No circuit redesign or PCB modification is required.
Q: Are there any differences in isolation voltage or current transfer ratio between these parts?
A: No. Both components provide 5000Vrms isolation and identical current transfer ratio specifications of 50% to 150% @ 5mA.
Q: What is the significance of the product status difference?
A: TLP781F(Y-LF7,F) is classified as obsolete and is no longer in active production. TLP785F(Y-LF7,F) is actively manufactured by Toshiba Semiconductor and Storage, ensuring ongoing availability and supply chain continuity.
Q: Are the package and mounting specifications identical?
A: Yes. Both parts use 4-SMD, Gull Wing surface mount packaging with identical physical and electrical interfaces.
Q: Do these components have the same moisture sensitivity rating?
A: Yes. Both components carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity constraints during storage or handling.
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