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TLP781F(BL-LF7,F) Equivalent & Substitute Parts
Part Overview
The TLP781F(BL-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 equivalent and substitute components essential for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | TLP781F(BL-LF7,F) |
| Category | Optoisolators |
| Number of Channels | 1 |
| Voltage - Isolation | 5000Vrms |
| Current Transfer Ratio (Min) | 200% @ 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 |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the TLP781F(BL-LF7,F) is determined by the following critical parameters:
- Single channel configuration
- 5000Vrms isolation voltage
- Transistor output topology
- DC input type
- 80V maximum output voltage
- 50mA output current per channel
- -55°C to 110°C operating temperature range
- Moisture Sensitivity Level 1 (Unlimited)
Two substitute parts meet these electrical specifications. The first substitute differs in mounting technology (through-hole versus surface mount), while the second substitute maintains identical surface mount packaging with enhanced current transfer ratio capability.
Parameter Comparison
| Parameter | TLP781F(BL-LF7,F) | TLP785F(BL-LF7,F) | TLP785F(D4BLF7,F) |
|---|---|---|---|
| Manufacturer | Toshiba | Toshiba | Toshiba |
| Number of Channels | 1 | 1 | 1 |
| Voltage - Isolation | 5000Vrms | 5000Vrms | 5000Vrms |
| Current Transfer Ratio (Min) | 200% @ 5mA | 200% @ 5mA | 200% @ 5mA |
| Current Transfer Ratio (Max) | 600% @ 5mA | 400% @ 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 | Through Hole | Surface Mount |
| Package / Case | 4-SMD, Gull Wing | 4-DIP (0.400", 10.16mm) | 4-SMD, Gull Wing |
| Product Status | Obsolete | Active | Active |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
For applications currently using the obsolete TLP781F(BL-LF7,F), the TLP785F(D4BLF7,F) is the primary substitute when surface mount packaging is required. This part maintains identical electrical performance, package form factor, and mounting technology while offering active product status and full manufacturing support from Toshiba.
The TLP785F(BL-LF7,F) serves as an alternative when through-hole mounting is acceptable or preferred. This part is electrically compatible across all critical parameters with the exception of current transfer ratio maximum specification (400% versus 600%), which remains within acceptable operating margins for most applications. Through-hole mounting may require PCB redesign.
Both substitute parts carry identical isolation voltage, output current capability, temperature range, and moisture sensitivity ratings as the original component. Selection between substitutes depends on mounting technology requirements and PCB layout constraints.
Frequently Asked Questions (FAQ)
Q: Can TLP785F(D4BLF7,F) directly replace TLP781F(BL-LF7,F) without PCB modification?
A: Yes. Both parts use identical 4-SMD surface mount packaging with gull wing leads. Pinout and footprint compatibility are maintained. No PCB redesign is required.
Q: What is the difference between TLP785F(BL-LF7,F) and TLP785F(D4BLF7,F)?
A: The primary difference is mounting technology. TLP785F(BL-LF7,F) uses through-hole 4-DIP packaging, while TLP785F(D4BLF7,F) uses surface mount 4-SMD packaging. Electrical specifications are equivalent except for current transfer ratio maximum (400% versus 600%).
Q: Are there any electrical performance differences between the original and substitute parts?
A: The TLP785F(D4BLF7,F) maintains all critical electrical parameters including isolation voltage, output voltage, output current, and operating temperature range. Current transfer ratio maximum is identical at 600%. The TLP785F(BL-LF7,F) has a lower current transfer ratio maximum of 400%, which may affect circuit design margins in applications requiring maximum gain.
Q: Why is the original TLP781F(BL-LF7,F) marked as obsolete?
A: Product obsolescence is determined by manufacturer lifecycle decisions. Active alternatives with superior or equivalent specifications are available from Toshiba, making continued production of the original part unnecessary.
Q: What certifications apply to these substitute parts?
A: All parts carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications. Moisture Sensitivity Level 1 (Unlimited) applies to all variants, indicating no moisture sensitivity constraints during storage or handling.
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