📌 Product Overview
The XL-PD438B is a silicon infrared receiving diode encapsulated in a black colloid, specifically engineered to minimize noise interference. 💡 With a peak sensitivity wavelength of 940nm and compact dimensions of 6.6x4.8x3.8mm, it is ideally suited for automated SMT processes requiring high-efficiency optical detection. 👇 This component focuses on delivering stable reverse light currents for industrial counting, smart metering, and camera monitoring systems.
🔧 Typical Applications
Based on the 940nm spectral response and MSL 3 rating, the XL-PD438B is deployed in the following scenarios:
- Consumer Electronics: Infrared remote controllers for set-top boxes and HVAC systems.
- Industrial Automation: Counters, thermal imaging sensors, and smart metering interfaces.
- Robotics: Intelligent cars and robotic obstacle detection systems.
- Wireless Systems: Signal transmission modules and photoelectric switches.
⚡ Key Technical Specifications
The electrical performance of the XL-PD438B is characterized by fast response times and distinct sensitivity rankings. ⚠️ Designers should note the strict binning codes for reverse light current to ensure lot-to-lot consistency in mass production.
| Parameter | Symbol | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Peak Wavelength | $\lambda_p$ | - | - | 940 | - | nm |
| Reverse Light Current | $I_L$ | $V_R=5V, E_e=1mW/cm^2$ | 15 | - | 25 | $\mu A$ |
| Dark Current | $I_D$ | $V_R=10V$ | - | 5 | 30 | nA |
| Rise/Fall Time | $T_r / T_f$ | $R_L=1k\Omega, V_R=10V$ | - | - | 50 | $\mu s$ |
| Total Capacitance | $C_t$ | $V_R=5V, f=1MHz$ | - | - | 6 | pF |
🚨 Absolute Maximum Ratings & Process Limits
Exceeding these ratings may cause permanent device failure or degradation. 🔒 Thermal management during soldering is critical given the moisture sensitivity level (MSL 3).
| Parameter | Symbol | Max. Rating | Unit | Notes |
|---|---|---|---|---|
| Power Dissipation | $P_d$ | 150 | mW | Derate above 25°C ambient |
| Reverse Voltage | $V_R$ | 32 | V | Continuous operation |
| Operating Temp. | $T_{opr}$ | -40 to +85 | °C | Industrial standard range |
| Storage Temp. | $T_{stg}$ | -40 to +85 | °C | Moisture proof bag required |
| Soldering Temp | $T_{sol}$ | 260 | °C | $\le$ 6 Seconds (Hand/Wave) |
📦 Package, Dimensions & Assembly Notes
The component utilizes an EIA standard compliant package with an outline of 6.6 x 4.8 x 3.8mm.
👇 Critical Soldering Guidelines:
- Profile: Recommended max peak temperature is 240°C for 6 seconds.
- Stress: Do not apply mechanical pressure to the body during heating.
- Cleaning: Avoid chemicals like Trichloroethylene or Ketone; use Ethanol for < 3 mins.
- Lead Forming: Bend leads minimum 2mm from the epoxy body prior to soldering.
📈 Sourcing & Supply Considerations
When integrating the XL-PD438B into BOMs, verify the supply chain for authentic EIA-standard packaging.
- Quality Control: Request binning data (BIN 1-4) to match sensitivity requirements.
- MSL Handling: Ensure suppliers comply with MSL 3 moisture proof packaging to prevent pop-corning.
- Samples: Validate soldering profiles with pre-production samples to optimize yield rates.
❓ FAQ
Q: What is the peak sensitivity wavelength for the XL-PD438B?
The diode is optimized for a peak sensitivity wavelength ($\lambda_p$) of 940nm, making it ideal for standard infrared remote control protocols.
Q: Can this component be used in high-temperature industrial environments?
Yes, the absolute maximum operating temperature rating is +85°C, and the storage temperature range extends down to -40°C, suitable for harsh industrial control applications.
Q: What are the specific cleaning constraints for the black colloid package?
Do not use harsh solvents like acetone or ketones. Cleaning with ethanol is permitted for a maximum duration of 3 minutes at room temperature to prevent surface damage or fading.
Q: How should I handle the component during PCB assembly regarding MSL?
The XL-PD438B has a Moisture Sensitivity Level (MSL) of 3. It must be stored in a moisture-proof antistatic bag and reflow soldered according to IPC/JEDEC standards to avoid thermal damage.
Q: What is the maximum reverse voltage this diode can withstand?
The maximum reverse voltage ($V_R$) is 32V. Exceeding this voltage risks reverse breakdown and permanent damage to the diode junction.
