📌 Product Overview
The XL-PT908-7C from XINGLIGHT is a NPN silicon phototransistor specifically optimized for infrared signal detection 📡. Encapsulated in a transparent epoxy colloid with dimensions of 5.7mm x 4.5mm x 2.3mm, this component is designed to respond to peak wavelengths at 940nm. It serves as a critical sensing element in various optoelectronic interfaces, converting light signals into electrical currents with high efficiency and fast response times.
The device is engineered for applications requiring reliable light reception and switching capabilities. With a Collector-Emitter voltage rating of 30V and low saturation voltage, it is suitable for integration into control circuits, sensor modules, and wireless communication interfaces. Its design emphasizes thermal stability and rapid response to optical pulses, ensuring precise signal processing in embedded systems.
💡 Typical Applications
- Industrial Control: Utilization in counters, thermal imaging systems, and smart metering for non-contact signal detection.
- Consumer Electronics: Integration into infrared remote controllers for home appliances and set-top boxes.
- Robotics: Implementation in intelligent cars and robots for obstacle avoidance and path tracking.
- Medical Equipment: Use in precise optical sensors and diagnostic devices requiring clean signal reception.
- Security Systems: Deployment in camera monitoring heads and infrared photoelectric switches for perimeter security.
📊 Key Technical Specifications
The following electrical characteristics are measured at an ambient temperature of 25°C (Ta=25℃).
| Parameter | Symbol | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Spectral Bandwidth | λ0.5 | / | 400 | / | 1100 | nm |
| Peak Sensitivity | λP | / | / | 940 | / | nm |
| Collector Current | Ic(ON) | Ee=1mW/cm², Vce=5V | 0.85 | / | / | mA |
| Saturation Voltage | Vce(SAT) | Ic=2mA, Ee=1mW/cm² | / | / | 0.4 | V |
| Dark Current | Io | Ee=0, Vce=20V | / | / | 100 | nA |
| Rise/Fall Time | Tr / Tf | Vce=5V, Ic=1mA, RL=1kΩ | / | / | 15 | μs |
⚠️ Absolute Maximum Ratings & Process Limits
Exceeding these values may cause permanent damage to the device. Stress beyond these limits for extended periods affects reliability.
| Parameter | Symbol | Max. Rating | Unit | Notes |
|---|---|---|---|---|
| Power Consumption | Pd | 75 | mW | |
| Collector-Emitter Voltage | VCEO | 30 | V | |
| Emitter-Collector Voltage | VECO | 5 | V | |
| Collector Current | IC(ON) | 20 | mA | Pulse width ≤ 0.1ms, Duty ≤ 1/10 |
| Operating Temp. | Topr | -20 to +85 | °C | |
| Storage Temp. | Tstg | -40 to +85 | °C | |
| Soldering (Wave) | Tsol | 260 | °C | Max 6 seconds |
| Soldering (Manual) | Tsol | 300 | °C | Max 3 seconds, 25W iron |
🔧 Package, Dimensions & Assembly Notes
- Package Dimensions: The component features a compact footprint with an outline of 5.7mm (L) x 4.5mm (W) x 2.3mm (H).
- Tolerances: Unless specified, dimension tolerances are ±0.30mm.
- MSL Level: The Moisture Sensitivity Level is classified as Level 3, requiring specific handling to prevent moisture-induced damage during reflow.
- Soldering Guidelines:
- Recommended peak wave soldering temperature is 240°C/6s.
- Welding points must be >2.0mm from the colloid bottom.
- Do not apply mechanical stress to the body during heating to prevent internal cracking.
- Avoid warping the circuit board post-soldering.
🚢 Sourcing & Supply Considerations
- Binning Selection: 📦 The product is sorted into five bins (BIN1-BIN5) based on Ic(ON) sensitivity (0.86mA to 4.50mA). Engineers must specify the required bin to ensure consistent signal gain across production batches.
- Supply Chain: Packaged in EIA standard compliant moisture-proof and anti-static foil bags to ensure safe transit and storage.
- Cross-Reference: When verifying drop-in replacements, confirm the 940nm peak wavelength and the 5.7x4.5mm footprint to avoid PCB fitment issues.
- Authenticity: Source through authorized channels to guarantee ROHS compliance and avoid counterfeit components with unstable dark current characteristics.
❓ FAQ
Q: What is the peak detection wavelength of the XL-PT908-7C?
A: The device is optimized for a peak wavelength (λP) of 940nm, which is the standard for infrared remote controls and optical data transmission.
Q: Can this phototransistor be used directly with a 5V microcontroller?
A: Yes, the Collector-Emitter saturation voltage (Vce(SAT)) is a maximum of 0.4V at 2mA, making it compatible with standard 5V logic. However, a base resistor or load calculation is recommended to limit the current within the 20mA maximum rating.
Q: What precautions should be taken during manual soldering?
A: Use a soldering iron with a capacity less than 25W and a tip temperature below 300°C. The soldering time per terminal must not exceed 3 seconds, and a 2-second cooling interval should be observed between terminals.
Q: How do I interpret the BIN codes for this component?
A: The BIN code (1-5) classifies the On-State Collector Current (Ic(ON)) under specific test conditions (1mW/cm² irradiance). Selecting a specific bin ensures that all sensors in a batch have similar sensitivity levels, which is crucial for uniform performance in consumer electronics like smart meters or remote receivers.
Q: Is the XL-PT908-7C compliant with environmental regulations?
A: Yes, the datasheet explicitly states that the product meets ROHS requirements, ensuring it is free from hazardous substances as defined by the directive.
