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TLP781F(BL,F) Equivalent & Substitute Parts
Part Overview
The TLP781F(BL,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 essential for ongoing system support and new design implementations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | TLP781F(BL,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) | 600% @ 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 components for the TLP781F(BL,F) are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:
Critical Parameters for Substitution:
- Single-channel configuration
- 5000Vrms isolation voltage
- Transistor output type
- Current transfer ratio range: 200% to 600% @ 5mA
- Maximum output voltage: 80V
- Maximum output current: 50mA per channel
- 4-DIP through-hole package format
- Operating temperature range: -55°C to 110°C
All substitute parts listed maintain identical electrical specifications and mechanical compatibility with the original TLP781F(BL,F) component.
Parameter Comparison
| Parameter | TLP781F(BL,F) | TLP785F(BL,F) | TLP785F(D4-BL,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 | 600% @ 5mA | 600% @ 5mA |
| Output Type | Transistor | Transistor | Transistor |
| Voltage - Output (Max) | 80V | 80V | 80V |
| Current - Output / Channel | 50mA | 50mA | 50mA |
| Turn On / Turn Off Time (Typ) | 3µs, 3µs | 3µs, 3µs | 3µs, 3µs |
| Rise / Fall Time (Typ) | 2µs, 3µs | 2µs, 3µs | 2µs, 3µs |
| 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 TLP781F(BL,F) is classified as obsolete. Both substitute parts—TLP785F(BL,F) and TLP785F(D4-BL,F)—are active products from the same manufacturer with identical electrical and mechanical specifications.
Direct Manufacturer Substitute: TLP785F(BL,F) is the primary equivalent, offering full parametric compatibility with active product status and current manufacturing support.
Parametric Equivalent: TLP785F(D4-BL,F) provides identical electrical performance and mechanical compatibility. The designation difference reflects packaging or internal configuration variations that do not affect functional equivalence for this application.
Both substitute parts maintain compliance with EAR99 export classification and HTSUS tariff code 8541.49.8000, matching the original component's regulatory status.
Frequently Asked Questions (FAQ)
Q: Can TLP785F(BL,F) be used as a direct replacement for TLP781F(BL,F)?
A: Yes. The TLP785F(BL,F) maintains identical electrical specifications, including isolation voltage, current transfer ratio, output voltage and current ratings, timing characteristics, and operating temperature range. The 4-DIP through-hole package is mechanically compatible with existing PCB layouts.
Q: What is the difference between TLP785F(BL,F) and TLP785F(D4-BL,F)?
A: Both parts are parametrically equivalent with identical electrical and mechanical specifications. The designation difference reflects internal packaging or configuration variations that do not affect functional performance or compatibility in circuit applications.
Q: Why is the TLP781F(BL,F) listed as obsolete?
A: Product obsolescence is determined by the manufacturer. The TLP785F series represents the current active product line from Toshiba for this optoisolator category, providing equivalent functionality with ongoing manufacturing and supply support.
Q: Are there any compliance or certification differences between the original and substitute parts?
A: No. All parts share identical moisture sensitivity level (MSL 1), export classification (EAR99), and HTSUS tariff code (8541.49.8000).
Q: Can these parts be used interchangeably in existing designs?
A: Yes. The substitute parts are electrically and mechanically equivalent. No circuit modifications or PCB redesign are required for substitution.
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