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📋 Product Overview
The XL815 is a high-performance Photo Darlington transistor manufactured by International Rectifier. It is engineered for applications requiring robust electrical isolation and signal transfer between control and power circuits. The device is primarily utilized in feedback control loops of switching power supplies and for isolating main circuits from control circuitry. Its core design focus is on ensuring stable output voltage and the rapid transmission of fault signals to trigger protection mechanisms during overload or short-circuit events.
⚙️ Typical Applications
- Switching power supply feedback and isolation
- Industrial automation control systems
- Photovoltaic energy storage systems
- Motor control and PLC interfaces
- Power management and protection circuits
- Home appliance power control
- Data collection and inverter control
- Relay drive circuits
🔑 Key Technical Specifications
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Current Transfer Ratio | CTR | 600 ~ 7500 | % |
| Forward Voltage | VF | 1.2 Typ. | V |
| Collector-Emitter Saturation Voltage | VCE(sat) | 0.8 Typ. | V |
| Isolation Resistance | RISO | 5x10¹⁰ | Ω |
| Isolation Capacitance | Cf | 0.6 Typ. | pF |
| Cut-off Frequency | fC | 6 | kHz |
⚠️ Absolute Maximum Ratings & Process Limits
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Isolation Voltage | VISO | 5000 | Vrms |
| Collector-Emitter Voltage | VCEO | 40 | V |
| Emitter-Collector Voltage | VECO | 7 | V |
| Forward Current | IF | 60 | mA |
| Collector Current | IC | 80 | mA |
| Operating Temperature | TOPR | -55 ~ +110 | °C |
| Soldering Temperature | TSOL | 260 | °C |
📦 Package, Dimensions & Assembly Notes
The XL815 is available in three package options: DIP4, DIP4-M, and SMD4. All packages use a UL 94V-0 rated molding compound and matte tin-plated leads. For surface mount assembly (SMD4), reflow soldering is recommended with a peak temperature of 260°C for a maximum of 30 seconds. Through-hole soldering should be performed at 260°C for 10 seconds. Hand soldering for rework is limited to a maximum of 360°C for 3 seconds to prevent damage to the device.
🚀 Sourcing & Supply Considerations
Ensure procurement from authorized distributors to guarantee authenticity. Verify CTR (Current Transfer Ratio) binning specified in the part number. Lead times and stock levels should be confirmed for high-volume production. For custom marking or specific package variants, contact manufacturer support directly.
❓ FAQ
Q: What is the difference between the XL815, XL815M, and XL815S part numbers?
A: The suffix denotes the package type: XL815 is DIP4, XL815M is DIP4-M, and XL815S is SMD4 for tape and reel assembly.
Q: What is the Current Transfer Ratio (CTR) for the XL815?
A: The CTR is wide-ranging, specified from 600% to 7500% at IF=1mA and VCE=2V, allowing for flexible circuit design.
Q: What are the absolute maximum isolation and voltage ratings?
A: The device offers a high isolation voltage of 5000Vrms and has a maximum VCEO of 40V and VECO of 7V, which must not be exceeded.
Q: Is the XL815 environmentally compliant?
A: Yes, it is compliant with CQC, UL, and VDE requirements and is classified as an environmentally friendly, halogen-free product.
Q: What is the recommended soldering profile for the SMD4 package?
A: Reflow soldering is recommended with a peak temperature of 260°C, preheat at 150-200°C, and a time above liquidus of 60-150 seconds, for a maximum of three cycles.
