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TLP781(D4-Y-LF6,F) Equivalent & Substitute Parts
Part Overview
The TLP781(D4-Y-LF6,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 equivalent and substitute components essential for ongoing design support and production 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) | 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 |
Substitute Part Grouping Explanation
Substitute parts for the TLP781(D4-Y-LF6,F) are identified based on electrical and mechanical parameter alignment. The primary substitution criteria are:
- Single-channel configuration with transistor output
- 5000Vrms isolation voltage
- Current transfer ratio range of 50% to 150% @ 5mA
- Maximum output voltage of 80V
- Output current capability of 50mA per channel
- Operating temperature range of -55°C to 110°C
- Compliance certifications (ECCN: EAR99, HTSUS: 8541.49.8000)
Substitutes are categorized by mounting type compatibility. The TLP785(D4-Y-F6,F) represents a direct functional equivalent with through-hole mounting, while the TLP785F(Y-LF7,F) provides parametric equivalence in surface mount packaging.
Parameter Comparison
| Parameter | TLP781(D4-Y-LF6,F) | TLP785(D4-Y-F6,F) | TLP785F(Y-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) | 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 |
| 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 |
| 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
For applications currently using the obsolete TLP781(D4-Y-LF6,F), the TLP785F(Y-LF7,F) is the primary substitute when surface mount packaging is required. This part maintains identical electrical specifications and packaging form factor while offering active product status and current manufacturing support.
The TLP785(D4-Y-F6,F) serves as an alternative for designs that can accommodate through-hole mounting. This part provides equivalent electrical performance and active availability but requires PCB layout modification due to its 4-DIP package configuration.
Both substitute parts carry identical compliance certifications (ECCN: EAR99, HTSUS: 8541.49.8000) and moisture sensitivity ratings, ensuring regulatory and supply chain compatibility with the original design.
Frequently Asked Questions (FAQ)
Q: Can the TLP785F(Y-LF7,F) be used as a direct replacement for the TLP781(D4-Y-LF6,F)?
A: Yes. Both parts share identical electrical parameters including isolation voltage, current transfer ratio, output voltage and current ratings, and operating temperature range. The TLP785F(Y-LF7,F) maintains the same 4-SMD surface mount package configuration, enabling direct PCB substitution without layout modification.
Q: What is the difference between the TLP785(D4-Y-F6,F) and TLP785F(Y-LF7,F)?
A: The primary difference is mounting type. The TLP785(D4-Y-F6,F) uses through-hole 4-DIP packaging, while the TLP785F(Y-LF7,F) uses surface mount 4-SMD packaging. All electrical specifications are identical. Package selection depends on PCB design and assembly process requirements.
Q: Why is the TLP781(D4-Y-LF6,F) listed as obsolete?
A: Obsolete status indicates the part is no longer in active production. The TLP785 series provides equivalent functionality with ongoing manufacturing support and availability.
Q: Are there any electrical performance differences between these parts?
A: No. All three parts share identical electrical specifications: 5000Vrms isolation, 50-150% current transfer ratio @ 5mA, 80V maximum output voltage, 50mA output current, and -55°C to 110°C operating temperature range.
Q: Do these parts have the same compliance certifications?
A: Yes. All three parts carry ECCN: EAR99 and HTSUS: 8541.49.8000 classifications, with MSL rating of 1 (Unlimited).
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