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TLP127 Optoisolator Equivalent & Substitute Parts
Part Overview
The TLP127 is a photocoupler optoisolator with Darlington output configuration, designed for high-voltage isolation applications. It features 2500Vrms isolation voltage, 1 channel, and Darlington output topology suitable for DC input switching applications. The TLP127 is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production support.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Isolation Voltage | 2500Vrms |
| Number of Channels | 1 |
| Output Type | Darlington |
| Current Transfer Ratio (Min) | 1000% @ 1mA |
| Maximum Output Voltage | 300V |
| Maximum Output Current | 150mA |
| Vce Saturation (Max) | 1.2V |
| Turn On / Turn Off Time | 50µs / 15µs |
| Operating Temperature Range | -55°C to 100°C |
| Mounting Type | Surface Mount |
| Package | 6-MFSOP (4 Lead) |
Substitute Part Grouping Explanation
Substitution of the TLP127 optoisolator is determined by strict equivalence in the following critical parameters:
- Output Configuration: Darlington output topology (required for functional compatibility)
- Number of Channels: Single channel (1 channel)
- Input Type: DC input
- Current Transfer Ratio: Minimum 1000% @ 1mA (functional performance threshold)
- Maximum Output Current: 150mA per channel
- Vce Saturation: 1.2V maximum (switching performance)
- Mounting Type: Surface Mount
- Isolation Voltage: Minimum 2500Vrms (equal or higher acceptable)
The TLP187 meets all substitution criteria. It maintains identical output topology, channel count, input type, current transfer ratio, output current rating, and saturation voltage. The TLP187 provides enhanced isolation voltage (3750Vrms versus 2500Vrms), extended operating temperature range (-55°C to 110°C versus -55°C to 100°C), and active product status, making it a direct functional substitute.
Parameter Comparison
| Parameter | TLP127 | TLP187 | Compatibility |
|---|---|---|---|
| Isolation Voltage | 2500Vrms | 3750Vrms | TLP187 exceeds requirement |
| Number of Channels | 1 | 1 | Identical |
| Output Type | Darlington | Darlington | Identical |
| Current Transfer Ratio (Min) | 1000% @ 1mA | 1000% @ 1mA | Identical |
| Maximum Output Voltage | 300V | 300V | Identical |
| Maximum Output Current | 150mA | 150mA | Identical |
| Vce Saturation (Max) | 1.2V | 1.2V | Identical |
| Turn On / Turn Off Time | 50µs / 15µs | 50µs / 15µs | Identical |
| Operating Temperature Range | -55°C to 100°C | -55°C to 110°C | TLP187 extends upper limit |
| Mounting Type | Surface Mount | Surface Mount | Identical |
| Package | 6-MFSOP (4 Lead) | 6-SOIC (4 Lead) | Different package footprint |
| Product Status | Obsolete | Active | TLP187 actively manufactured |
Engineering Selection Recommendations
The TLP127 is obsolete and no longer in active production. The TLP187 is the direct functional equivalent, maintaining all critical electrical parameters including isolation voltage, output current, saturation voltage, and switching timing characteristics.
The TLP187 provides superior specifications in isolation voltage (3750Vrms versus 2500Vrms) and extended operating temperature range (-55°C to 110°C versus -55°C to 100°C). Active product status ensures ongoing availability and manufacturing support.
Package footprint differs between the two parts: TLP127 uses 6-MFSOP while TLP187 uses 6-SOIC. PCB layout modification is required for substitution. Both packages are 4-lead surface mount configurations with identical lead pitch and electrical connectivity.
The TLP187 is RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.
Frequently Asked Questions (FAQ)
Q: Can the TLP187 directly replace the TLP127 without circuit modification?
A: The TLP187 is electrically equivalent to the TLP127 in all functional parameters. However, the package footprint differs (6-SOIC versus 6-MFSOP), requiring PCB layout redesign. Electrical schematic connections remain unchanged.
Q: What is the significance of the higher isolation voltage in the TLP187?
A: The TLP187 provides 3750Vrms isolation versus the TLP127's 2500Vrms. This exceeds the original requirement and provides additional safety margin in high-voltage isolation applications. It does not negatively impact compatibility.
Q: Are there any thermal performance differences between these parts?
A: The TLP187 extends the maximum operating temperature to 110°C compared to the TLP127's 100°C. This provides broader thermal operating range. Switching characteristics (turn-on/turn-off time and rise/fall time) remain identical.
Q: Why is the TLP127 obsolete?
A: The TLP127 has been superseded by the TLP187 in Toshiba's product portfolio. The TLP187 offers enhanced specifications and maintains active manufacturing status.
Q: What packaging considerations apply to substitution?
A: The TLP127 uses 6-MFSOP (Gull Wing) package while the TLP187 uses 6-SOIC package. Both are surface mount with 4 leads. PCB footprint, solder pad layout, and pick-and-place programming require updates for the TLP187.
Q: Is the TLP187 compliant with current regulatory standards?
A: Yes. The TLP187 is RoHS3 compliant and REACH unaffected, meeting current electronic component regulatory requirements.
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