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TLP781F(D4-GRL,F) Equivalent & Substitute Parts
Part Overview
The TLP781F(D4-GRL,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage and is housed in a 4-DIP package. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts meet the same functional requirements within the allowed parameter ranges for this optoisolator category.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | TLP781F(D4-GRL,F) |
| Manufacturer | Toshiba Semiconductor and Storage |
| Category | Optoisolators |
| Number of Channels | 1 |
| Voltage - Isolation | 5000Vrms |
| Current Transfer Ratio (Min) | 100% @ 5mA |
| Current Transfer Ratio (Max) | 200% @ 5mA |
| Turn On / Turn Off Time (Typ) | 3µs, 3µs |
| Rise / Fall Time (Typ) | 2µs, 3µs |
| Input Type | DC |
| Output Type | Transistor |
| Voltage - Output (Max) | 80V |
| Current - Output / Channel | 50mA |
| Voltage - Forward (Vf) (Typ) | 1.15V |
| Current - DC Forward (If) (Max) | 60mA |
| Vce Saturation (Max) | 400mV |
| Operating Temperature | -55°C ~ 110°C |
| Mounting Type | Through Hole |
| Package / Case | 4-DIP (0.400", 10.16mm) |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the TLP781F(D4-GRL,F) is determined by the following critical parameters:
Isolation Voltage: Minimum 5000Vrms (substitutes with 5000Vrms or higher are acceptable)
Current Transfer Ratio: 100% to 200% @ 5mA (range must be maintained or exceeded)
Output Configuration: Single-channel transistor output with maximum output voltage of 80V and output current of 50mA
Switching Characteristics: Turn-on/turn-off times and rise/fall times must support the application timing requirements
Package Compatibility: 4-DIP through-hole mounting with 0.400" (10.16mm) spacing
Operating Temperature Range: -55°C to 110°C
Input Type: DC input
Substitute parts are grouped into two categories: direct manufacturer equivalents from Toshiba (TLP785F variants) and parametric equivalents from alternative manufacturers (Everlight EL816 series and Vishay VO617C-3X016) that meet all critical electrical and mechanical specifications.
Parameter Comparison
| Parameter | TLP781F(D4-GRL,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 | Everlight | Everlight | Vishay |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Isolation | 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 |
| Current Transfer Ratio (Max) | 200% @ 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 | — | — | 6µs, 4µs |
| Rise / Fall Time (Typ) | 2µs, 3µs | 2µs, 3µs | 2µs, 3µs | 2µs, 3µs | 2µs, 3µs | 4µs, 3µs | 4µs, 3µs | 3µs, 3µs |
| Input Type | DC | DC | DC | DC | DC | DC | DC | DC |
| Output Type | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor |
| Voltage - Output (Max) | 80V | 80V | 80V | 80V | 80V | 80V | 80V | 80V |
| Current - Output / Channel | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA |
| Voltage - Forward (Vf) (Typ) | 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 |
| Vce Saturation (Max) | 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 |
| 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) |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole | Through Hole |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
Toshiba TLP785F Series (Direct Manufacturer Equivalents)
The TLP785F variants—TLP785F(D4-GRL,F), TLP785F(GR-LF7,F), TLP785F(GRL,F), and TLP785F(GRL-F7,F)—are the primary substitutes for the obsolete TLP781F(D4-GRL,F). All four variants maintain identical electrical specifications and package configuration. These parts are manufactured by the same supplier as the original component and carry active product status, ensuring long-term availability and supply chain continuity. The packaging variants reflect different lead frame and tape-reel configurations but do not affect electrical performance or pin compatibility.
Everlight EL816 Series (Parametric Equivalents)
The EL816(M)(X) and EL816(M)(X)-V from Everlight Electronics provide parametric equivalence with the TLP781F(D4-GRL,F). Both variants meet the isolation voltage, current transfer ratio, output voltage, and output current specifications. The EL816 series exhibits a lower Vce saturation maximum of 200mV compared to the 400mV of the TLP781F, indicating improved switching efficiency. Rise time is specified at 4µs versus 2µs for the original part. Both EL816 variants carry ROHS3 compliance certification and active product status.
Vishay VO617C-3X016 (Parametric Equivalent)
The VO617C-3X016 from Vishay Semiconductor Opto Division provides parametric equivalence with enhanced isolation voltage of 5300Vrms, exceeding the 5000Vrms requirement. This part maintains all critical electrical parameters including current transfer ratio, output voltage, and output current specifications. The VO617C-3X016 exhibits turn-on/turn-off times of 6µs and 4µs respectively, which are longer than the TLP781F specification of 3µs each. This part carries ROHS3 compliance and active product status.
Selection between these substitutes should be based on application timing requirements, supply chain availability, and compliance certifications. For applications with strict timing constraints, the Toshiba TLP785F series maintains the fastest switching characteristics. For applications requiring enhanced isolation voltage margin, the Vishay VO617C-3X016 provides additional isolation headroom.
Frequently Asked Questions (FAQ)
Q: Can I directly replace TLP781F(D4-GRL,F) with TLP785F variants without circuit modification?
A: Yes. The TLP785F series maintains identical electrical specifications and 4-DIP package pinout. No circuit modifications are required for direct substitution.
Q: What is the difference between the four TLP785F variants?
A: The variants differ only in packaging configuration and lead frame type, indicated by the suffixes (D4-GRL,F), (GR-LF7,F), (GRL,F), and (GRL-F7,F). Electrical performance and pin compatibility are identical across all variants.
Q: Are Everlight EL816 and Vishay VO617C-3X016 pin-compatible with the TLP781F?
A: Yes. All substitute parts use the same 4-DIP package with identical pin assignments for single-channel transistor output optoisolators.
Q: What is the significance of the lower Vce saturation in the EL816 series?
A: Lower Vce saturation (200mV versus 400mV) indicates reduced voltage drop across the output transistor in saturation, resulting in lower power dissipation and improved efficiency in switching applications.
Q: Why does the VO617C-3X016 have longer turn-on/turn-off times?
A: The VO617C-3X016 specifies 6µs turn-on and 4µs turn-off times compared to 3µs for both parameters in the TLP781F. Applications with timing-critical requirements should account for this difference or select the Toshiba TLP785F series for equivalent switching speed.
Q: Is the higher isolation voltage of the VO617C-3X016 (5300Vrms) beneficial?
A: The 5300Vrms isolation rating provides additional safety margin above the 5000Vrms requirement. This is beneficial for applications operating near maximum isolation voltage specifications or requiring enhanced reliability margins.
Q: What compliance certifications apply to these substitute parts?
A: The Toshiba TLP785F series carries MSL 1 (Unlimited) moisture sensitivity rating. The Everlight EL816 series and Vishay VO617C-3X016 both carry ROHS3 compliance certification and MSL 1 rating.
Q: Are all substitute parts currently in active production?
A: Yes. All listed substitute parts carry active product status. The original TLP781F(D4-GRL,F) is classified as obsolete, making these active alternatives essential for new designs and ongoing system support.
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