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TLP781(GRL-TP6,F) Equivalent & Substitute Parts
Part Overview
The TLP781(GRL-TP6,F) is a single-channel optoisolator with transistor output manufactured by Toshiba Semiconductor and Storage. This component provides 5000Vrms isolation voltage in a 4-SMD surface mount package. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across isolation voltage, current transfer ratio, output characteristics, and thermal operating range.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| 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 |
| Vce Saturation (Max) | 400mV |
| Operating Temperature | -55°C ~ 110°C |
| Mounting Type | Surface Mount |
| Package / Case | 4-SMD, Gull Wing |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute optoisolators for the TLP781(GRL-TP6,F) are selected based on the following critical parameters:
- Isolation Voltage: Minimum 5000Vrms (Vishay VO617C-3X017T1 at 5300Vrms is acceptable; Everlight EL816 variants at 5000Vrms are direct equivalents)
- Current Transfer Ratio: 100% to 200% @ 5mA (all substitutes meet this range)
- Output Configuration: Transistor output with 80V maximum and 50mA per channel
- Saturation Voltage: Maximum 400mV (Everlight EL816 variants at 200mV provide improved performance; Vishay VO617C-3X017T1 at 400mV matches exactly)
- Package: 4-SMD, Gull Wing surface mount
- Temperature Range: -55°C to 110°C operating window
Substitutes are grouped into two categories: direct manufacturer alternatives (Toshiba TLP785) and parametric equivalents from alternative manufacturers (Everlight EL816 series and Vishay VO617C-3X017T1).
Parameter Comparison
| Part Number | Manufacturer | Status | Isolation (Vrms) | CTR Min @ 5mA | CTR Max @ 5mA | Vce Sat (Max) | Output Current | Temp Range | Package |
|---|---|---|---|---|---|---|---|---|---|
| TLP781(GRL-TP6,F) | Toshiba | Obsolete | 5000 | 100% | 200% | 400mV | 50mA | -55 to 110°C | 4-SMD |
| TLP785(GRL-TP6,F) | Toshiba | Active | 5000 | 100% | 200% | 400mV | 50mA | -55 to 110°C | 4-SMD |
| EL816(S)(X)(TD) | Everlight | Active | 5000 | 100% | 200% | 200mV | 50mA | -55 to 110°C | 4-SMD |
| EL816(S)(X)(TD)-V | Everlight | Active | 5000 | 100% | 200% | 200mV | 50mA | -55 to 110°C | 4-SMD |
| EL816(S)(X)(TU) | Everlight | Active | 5000 | 100% | 200% | 200mV | 50mA | -55 to 110°C | 4-SMD |
| EL816(S)(X)(TU)-V | Everlight | Active | 5000 | 100% | 200% | 200mV | 50mA | -55 to 110°C | 4-SMD |
| EL816(S1)(X)(TD) | Everlight | Active | 5000 | 100% | 200% | 200mV | 50mA | -55 to 110°C | 4-SMD |
| EL816(S1)(X)(TD)-V | Everlight | Active | 5000 | 100% | 200% | 200mV | 50mA | -55 to 110°C | 4-SMD |
| EL816(S1)(X)(TU) | Everlight | Active | 5000 | 100% | 200% | 200mV | 50mA | -55 to 110°C | 4-SMD |
| EL816(S1)(X)(TU)-V | Everlight | Active | 5000 | 100% | 200% | 200mV | 50mA | -55 to 110°C | 4-SMD |
| VO617C-3X017T1 | Vishay | Active | 5300 | 100% | 200% | 400mV | 50mA | -55 to 110°C | 4-SMD |
Engineering Selection Recommendations
Toshiba TLP785(GRL-TP6,F) is the primary direct substitute. It maintains identical electrical specifications and package configuration as the obsolete TLP781, with active product status ensuring long-term availability and supply chain stability.
Everlight EL816 series (all variants: S/S1, TD/TU, with or without -V suffix) provides parametric equivalence with improved performance characteristics. All EL816 variants feature reduced Vce saturation voltage (200mV versus 400mV), lower forward voltage (1.2V versus 1.15V), and RoHS3 compliance. These parts are suitable for applications where lower saturation voltage provides design margin benefits.
Vishay VO617C-3X017T1 offers the highest isolation voltage rating (5300Vrms) with saturation voltage matching the original TLP781 specification (400mV). This part is supplied in Tape & Reel packaging and maintains full electrical compatibility across all critical parameters.
All substitute parts share identical package geometry (4-SMD, Gull Wing), operating temperature range (-55°C to 110°C), and isolation voltage specifications at or above 5000Vrms, ensuring direct PCB-level compatibility without layout modifications.
Frequently Asked Questions (FAQ)
Q: Can EL816 variants with different suffixes (TD, TU, S, S1, -V) be used interchangeably?
A: Yes. All EL816 variants listed maintain identical electrical specifications for isolation voltage, current transfer ratio, output voltage, output current, and operating temperature. Suffix variations indicate manufacturing process or packaging tape configurations that do not affect electrical performance in circuit operation.
Q: What is the key difference between TLP781 and TLP785?
A: The TLP785 is the active production equivalent of the obsolete TLP781. Both parts share identical electrical specifications and package configuration. The TLP785 should be the preferred choice for new designs and production continuity due to active status and guaranteed availability.
Q: Is the Vishay VO617C-3X017T1 a direct replacement?
A: The VO617C-3X017T1 is a parametric equivalent with higher isolation voltage (5300Vrms versus 5000Vrms) and identical saturation voltage (400mV). It is electrically compatible but supplied in Tape & Reel packaging rather than standard SMD format. Verify tape specifications against assembly equipment requirements before selection.
Q: Do Everlight EL816 parts require design changes due to lower saturation voltage?
A: No design changes are required. The reduced saturation voltage (200mV) of EL816 variants is a performance improvement that provides additional design margin. Circuits designed for 400mV saturation will operate correctly with 200mV saturation.
Q: Are all substitutes RoHS compliant?
A: Everlight EL816 series parts are RoHS3 compliant. Toshiba TLP785 and Vishay VO617C-3X017T1 compliance status is not specified in the provided data. Verify RoHS certification requirements with component suppliers for specific applications.
Q: Can these optoisolators be used in high-temperature applications?
A: All listed parts support the identical operating temperature range of -55°C to 110°C. Applications requiring operation beyond this range require alternative component selection.
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