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TLP781F(D4GR-LF7,F Optoisolator Equivalent & Substitute Parts
Part Overview
The TLP781F(D4GR-LF7,F is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage in a 4-DIP through-hole package and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute parts maintain the same electrical and mechanical specifications required for direct circuit compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | TLP781F(D4GR-LF7,F |
| Manufacturer | Toshiba Semiconductor and Storage |
| Category | Optoisolators |
| Product Status | Obsolete |
| Number of Channels | 1 |
| Voltage - Isolation | 5000Vrms |
| Current Transfer Ratio (Min) | 100% @ 5mA |
| Current Transfer Ratio (Max) | 200% @ 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 |
Substitute Part Grouping Explanation
Substitute parts for the TLP781F(D4GR-LF7,F are classified based on strict parameter matching across the following critical specifications:
Mandatory Matching Parameters:
- Number of Channels: 1
- Voltage - Isolation: 5000Vrms or higher
- Output Type: Transistor
- Voltage - Output (Max): 80V
- Current - Output / Channel: 50mA
- Operating Temperature Range: -55°C ~ 110°C
- Package / Case: 4-DIP (0.400", 10.16mm)
- Mounting Type: Through Hole
- Input Type: DC
Allowable Parameter Variations:
- Current Transfer Ratio (Max): 200% to 300% @ 5mA
- Turn On / Turn Off Time: 3µs typical or equivalent
- Rise / Fall Time: Within 2-4µs range
- Voltage - Forward (Vf): 1.1V to 1.2V typical
- Vce Saturation: 200mV to 400mV maximum
Substitute parts are grouped into two categories: Direct Manufacturer Substitutes (same manufacturer, active product status) and Parametric Equivalents (alternative manufacturers, matching electrical and mechanical specifications).
Parameter Comparison
| Parameter | TLP781F(D4GR-LF7,F | TLP785F(D4GRF7,F | TLP785F(D4-GRL,F | TLP785F(GR-LF7,F | TLP785F(GRL,F | TLP785F(GRL-F7,F | EL816(M)(X) | EL816(M)(X)-V | VO617C-3X016 |
|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Toshiba | Toshiba | Toshiba | Toshiba | Toshiba | Toshiba | Everlight | Everlight | Vishay |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Isolation | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5000Vrms | 5300Vrms |
| Current Transfer Ratio (Min) | 100% @ 5mA | 100% @ 5mA | 100% @ 5mA | 100% @ 5mA | 100% @ 5mA | 100% @ 5mA | 100% @ 5mA | 100% @ 5mA | 100% @ 5mA |
| Current Transfer Ratio (Max) | 200% @ 5mA | 300% @ 5mA | 200% @ 5mA | 200% @ 5mA | 200% @ 5mA | 200% @ 5mA | 200% @ 5mA | 200% @ 5mA | 200% @ 5mA |
| Turn On / Turn Off Time (Typ) | 3µs, 3µs | 3µs, 3µs | 3µs, 3µs | 3µs, 3µs | 3µs, 3µs | 3µs, 3µs | — | — | 6µs, 4µs |
| Rise / Fall Time (Typ) | 2µs, 3µs | 2µs, 3µs | 2µs, 3µs | 2µs, 3µs | 2µs, 3µs | 2µs, 3µs | 4µs, 3µs | 4µs, 3µs | 3µs, 3µs |
| Output Type | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor |
| Voltage - Output (Max) | 80V | 80V | 80V | 80V | 80V | 80V | 80V | 80V | 80V |
| Current - Output / Channel | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA |
| Voltage - Forward (Vf) (Typ) | 1.15V | 1.15V | 1.15V | 1.15V | 1.15V | 1.15V | 1.2V | 1.2V | 1.1V |
| Current - DC Forward (If) (Max) | 60mA | 60mA | 60mA | 60mA | 60mA | 60mA | 60mA | 60mA | 60mA |
| Vce Saturation (Max) | 400mV | 400mV | 400mV | 400mV | 400mV | 400mV | 200mV | 200mV | 400mV |
| Operating Temperature | -55°C ~ 110°C | -55°C ~ 110°C | -55°C ~ 110°C | -55°C ~ 110°C | -55°C ~ 110°C | -55°C ~ 110°C | -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) | 4-DIP (0.400", 10.16mm) | 4-DIP (0.400", 10.16mm) | 4-DIP (0.400", 10.16mm) | 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 | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
| Input Type | DC | DC | DC | DC | DC | DC | DC | DC | DC |
Engineering Selection Recommendations
Toshiba TLP785F Series (Direct Manufacturer Substitutes)
The TLP785F series represents the active product line replacement for the obsolete TLP781F. All five variants—TLP785F(D4GRF7,F, TLP785F(D4-GRL,F, TLP785F(GR-LF7,F, TLP785F(GRL,F, and TLP785F(GRL-F7,F—are manufactured by Toshiba and maintain identical electrical specifications with the TLP781F except for Current Transfer Ratio (Max), which ranges from 200% to 300% @ 5mA. These parts are in active production status and provide the highest compatibility for direct replacement in existing designs. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all variants.
Everlight EL816 Series (Parametric Equivalents)
The EL816(M)(X) and EL816(M)(X)-V are parametric equivalents manufactured by Everlight Electronics Co Ltd. Both variants meet all mandatory electrical and mechanical specifications. The EL816 series features a lower Vce Saturation maximum of 200mV compared to 400mV in the TLP781F, which represents improved saturation performance. Rise/Fall Time is specified at 4µs and 3µs respectively, within the allowable range. Both variants are RoHS3 compliant and in active production status.
Vishay VO617C-3X016 (Parametric Equivalent)
The VO617C-3X016 manufactured by Vishay Semiconductor Opto Division provides a parametric equivalent with enhanced isolation voltage of 5300Vrms compared to the 5000Vrms specification of the TLP781F. This part meets all mandatory electrical and mechanical requirements and is RoHS3 compliant. The VO617C-3X016 is supplied in tube packaging and is in active production status.
All substitute parts are classified as EAR99 for export control purposes and share the same HTSUS code (8541.49.8000) as the original part.
Frequently Asked Questions (FAQ)
Q: Can TLP785F variants be used as direct replacements for TLP781F(D4GR-LF7,F?
A: Yes. All TLP785F variants maintain the same isolation voltage (5000Vrms), output type (transistor), package (4-DIP through-hole), and operating temperature range (-55°C ~ 110°C). The primary difference is Current Transfer Ratio (Max), which is 200% to 300% @ 5mA for TLP785F compared to 200% for TLP781F. This represents equal or improved performance. TLP785F parts are in active production status, making them the recommended replacement for the obsolete TLP781F.
Q: What is the difference between the five TLP785F variants?
A: All five TLP785F variants—TLP785F(D4GRF7,F, TLP785F(D4-GRL,F, TLP785F(GR-LF7,F, TLP785F(GRL,F, and TLP785F(GRL-F7,F—share identical electrical specifications. The differences are in packaging designations and supplier device package codes. Selection among variants depends on supplier availability and internal part numbering systems. Electrical performance and pinout are equivalent across all five variants.
Q: Are Everlight EL816 parts compatible with TLP781F circuits?
A: Yes. The EL816(M)(X) and EL816(M)(X)-V meet all mandatory electrical and mechanical specifications for substitution. Both parts provide 5000Vrms isolation, transistor output, 50mA output current, and 4-DIP through-hole packaging. The EL816 series features lower Vce Saturation (200mV maximum) compared to TLP781F (400mV maximum), which represents improved switching performance. Rise/Fall Time specifications are within acceptable ranges.
Q: How does the Vishay VO617C-3X016 compare to the TLP781F?
A: The VO617C-3X016 is a parametric equivalent with enhanced isolation voltage of 5300Vrms compared to 5000Vrms in the TLP781F. All other electrical parameters—Current Transfer Ratio, output type, voltage/current ratings, and operating temperature—match the TLP781F specifications. The VO617C-3X016 is supplied in tube packaging and is RoHS3 compliant. The higher isolation voltage provides additional safety margin in high-voltage isolation applications.
Q: Can these substitute parts be used interchangeably in the same PCB design?
A: Yes. All substitute parts share the same 4-DIP (0.400", 10.16mm) through-hole package and pinout. They can be used interchangeably on the same printed circuit board without layout modifications. Pin assignments and electrical interface requirements are identical across all listed parts.
Q: What is the inventory status of these substitute parts?
A: All substitute parts are in active production and have confirmed inventory availability. TLP785F variants range from 647 to 1123 pieces in stock. Everlight EL816 variants have 926 to 990 pieces available. Vishay VO617C-3X016 has 1053 pieces in stock. Availability should be confirmed with suppliers for production quantities.
Q: Are there RoHS compliance differences between substitute parts?
A: Toshiba TLP785F variants do not specify RoHS status in the provided data. Everlight EL816 series and Vishay VO617C-3X016 are both RoHS3 compliant. For applications requiring RoHS compliance, Everlight or Vishay parts are the appropriate selections.
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