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TLP781F(D4BLL-T7,F Equivalent & Substitute Parts
Part Overview
The TLP781F(D4BLL-T7,F is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation and is housed in a 4-DIP through-hole package. The part is currently classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | TLP781F(D4BLL-T7,F |
| Manufacturer | Toshiba Semiconductor and Storage |
| Category | Optoisolators |
| Number of Channels | 1 |
| Voltage - Isolation | 5000Vrms |
| Current Transfer Ratio (Min) | 200% @ 5mA |
| Current Transfer Ratio (Max) | 400% @ 5mA |
| Output Type | Transistor |
| Voltage - Output (Max) | 80V |
| Current - Output / Channel | 50mA |
| Operating Temperature | -55°C ~ 110°C |
| Package / Case | 4-DIP (0.400", 10.16mm) |
| Mounting Type | Through Hole |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitute parts for the TLP781F(D4BLL-T7,F are identified based on the following critical parameters that define functional compatibility:
- Single-channel configuration
- 5000Vrms isolation voltage
- Transistor output topology
- 4-DIP through-hole package
- 80V maximum output voltage
- 50mA maximum output current per channel
- Operating temperature range of -55°C to 110°C
- DC input type
Two substitute parts meet these core requirements with variations in Current Transfer Ratio specifications.
Parameter Comparison
| Parameter | TLP781F(D4BLL-T7,F (Main) | TLP785F(D4B-T7,F (Similar) | TLP785F(BLL-T7,F (Parametric Equivalent) |
|---|---|---|---|
| Manufacturer | Toshiba | Toshiba | Toshiba |
| Number of Channels | 1 | 1 | 1 |
| Voltage - Isolation | 5000Vrms | 5000Vrms | 5000Vrms |
| Current Transfer Ratio (Min) | 200% @ 5mA | 50% @ 5mA | 200% @ 5mA |
| Current Transfer Ratio (Max) | 400% @ 5mA | 600% @ 5mA | 400% @ 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 |
| Package / Case | 4-DIP (0.400", 10.16mm) | 4-DIP (0.400", 10.16mm) | 4-DIP (0.400", 10.16mm) |
| Mounting Type | Through Hole | Through Hole | Through Hole |
| Product Status | Obsolete | Active | Active |
| 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
The TLP785F(BLL-T7,F is the primary parametric equivalent for the obsolete TLP781F(D4BLL-T7,F. Both parts share identical Current Transfer Ratio specifications (200% minimum, 400% maximum at 5mA), timing characteristics, and electrical performance parameters. The TLP785F(BLL-T7,F is currently in active production status, ensuring availability for new designs and production continuity.
The TLP785F(D4B-T7,F is classified as a similar substitute with a broader Current Transfer Ratio range (50% to 600% at 5mA). This part is also in active production status. The wider minimum CTR specification (50% versus 200%) may require circuit design verification to confirm adequate performance in applications with strict current transfer ratio requirements.
Both substitute parts maintain identical isolation voltage, output voltage rating, output current capability, timing performance, and package configuration as the original TLP781F(D4BLL-T7,F.
Frequently Asked Questions (FAQ)
Q: Can TLP785F(BLL-T7,F directly replace TLP781F(D4BLL-T7,F in existing designs?
A: Yes. The TLP785F(BLL-T7,F maintains identical electrical specifications for Current Transfer Ratio, isolation voltage, output voltage, output current, timing characteristics, and package configuration. No circuit modifications are required.
Q: What is the key difference between TLP785F(D4B-T7,F and TLP785F(BLL-T7,F?
A: The primary difference is the Current Transfer Ratio minimum specification. TLP785F(BLL-T7,F specifies 200% minimum CTR (matching the original TLP781F), while TLP785F(D4B-T7,F specifies 50% minimum CTR. Both share the same 400% and 600% maximum CTR limits respectively.
Q: Are both substitute parts available in the same 4-DIP package?
A: Yes. Both TLP785F(D4B-T7,F and TLP785F(BLL-T7,F are supplied in 4-DIP (0.400", 10.16mm) through-hole packages, identical to the original TLP781F(D4BLL-T7,F.
Q: What is the product status difference between the main part and substitutes?
A: The TLP781F(D4BLL-T7,F is classified as obsolete. Both substitute parts, TLP785F(D4B-T7,F and TLP785F(BLL-T7,F, are in active production status, ensuring long-term availability and supply chain stability.
Q: Do the substitute parts have the same isolation voltage rating?
A: Yes. All three parts maintain 5000Vrms isolation voltage, meeting identical isolation requirements.
Q: Are there any compliance or certification differences?
A: No. All three parts share identical ECCN (EAR99), HTSUS (8541.49.8000), and Moisture Sensitivity Level (MSL 1 - Unlimited) classifications.
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