📌 Product Overview
The XL-PD438C from XINGLIGHT is a silicon photodiode specifically optimized for 940nm infrared detection. Housed in a transparent, EIA-compliant package with outline dimensions of 6.6 x 4.8 x 3.8mm, this component is designed to provide a reliable optical window for various signal transmission circuits. Its construction focuses on high energy efficiency and rapid startup response, making it suitable for compact PCB layouts requiring precise IR sensing capabilities.
This component is engineered to support both consumer electronics and robust industrial applications. The design prioritizes stable performance under standard environmental conditions, offering a balance between sensitivity and response speed. It is positioned as a standard solution for designs requiring non-visible light detection without the need for specialized optical filters.
🛠️ Typical Applications
Based on the XL-PD438C’s peak spectral sensitivity of 940nm and fast rise/fall times (approx. 50μs), this component is ideally suited for the following scenarios:
- Infrared Remote Controllers: Standard receiver for consumer electronics and home appliances.
- Industrial Control Systems: Integration into counters, smart meters, and thermal imaging equipment requiring precise light detection.
- Wireless Communication: Utilized in short-range signal transmission and data links.
- Robotics & Smart Vehicles: Obstacle avoidance and line tracking sensors in automated guided vehicles (AGVs).
- Optoelectric Switches: Detection sensors for safety mechanisms and position tracking.
- Medical Equipment: Non-invasive sensors requiring compliance with reliability standards.
⚡ Key Technical Specifications
| Parameter | Symbol | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Reverse Light Current | $I_L$ | $\lambda_P=940nm, V_R=5V, E_e=1mW/cm^2$ | 15 | 25 | - | $\mu A$ |
| Short-Circuit Current | $I_{sc}$ | $\lambda_P=940nm, E_e=1mW/cm^2$ | - | 18 | - | $\mu A$ |
| Open-Circuit Voltage | $V_{OC}$ | $\lambda_P=940nm, E_e=5mW/cm^2$ | - | 0.35 | - | $V$ |
| Reverse Dark Current | $I_D$ | $V_R=10V, E_e=0mW/cm^2$ | - | 5 | 30 | $nA$ |
| Reverse Breakdown Voltage | $B_{VR}$ | $I_R=100\mu A, E_e=0mW/cm^2$ | 25 | - | - | $V$ |
| Total Capacitance | $C_t$ | $V_R=5V, f=1MHz$ | - | 6 | - | $pF$ |
| Peak Sensitivity Wavelength | $\lambda_P$ | - | - | 940 | - | $nm$ |
| Rise/Fall Time | $t_r / t_f$ | $V_R=10V, R_L=1k\Omega$ | - | 50 | - | $\mu S$ |
🚫 Absolute Maximum Ratings & Process Limits
Exceeding these ratings may cause permanent damage to the device. Stressing the device to these limits for extended periods is not recommended.
| Parameter | Symbol | Maximum Rating | Unit | Notes |
|---|---|---|---|---|
| Power Consumption | $P_d$ | 150 | $mW$ | Derate above ambient 25°C |
| Reverse Voltage | $V_R$ | 32 | $V$ | |
| Operating Temperature | $T_{opr}$ | -40 to +85 | °C | |
| Storage Temperature | $T_{stg}$ | -40 to +85 | °C | |
| Soldering Temp | $T_{sol}$ | 260 | °C | Max 6 Seconds (Wave soldering) |
Critical Thermal Warning: The datasheet explicitly recommends controlling the maximum welding temperature to 240°C for 6 seconds to prevent epoxy damage or performance degradation. Hand soldering should be limited to 300°C for <3 seconds per terminal with a 25W iron.
📦 Package, Dimensions & Assembly Notes
🔍 Physical Outline:
- Dimensions: 6.6mm (L) x 4.8mm (W) x 3.8mm (H)
- Tolerance: ±0.30mm (unless noted)
- Colloid: Transparent epoxy for optimal IR transmission.
🔧 Assembly Guidelines:
- Lead Forming: Must be bent at least 2mm away from the epoxy body to prevent stress transfer.
- Cleaning: Do not use chemicals like Trichloroethylene or Acetone. Use Ethanol only.
- Packaging: Moisture Proof and Anti-Electrostatic Foil Bag (MSL Level 3). Use within 3 months of opening; store in dry box (Nitrogen) if delayed.
📦 Sourcing & Supply Considerations
- Ranking/Binning: The XL-PD438C is categorized into four rank bins (BIN1-BIN4) based on Reverse Light Current ($I_L$). Engineers must verify the specific bin code required for their circuit sensitivity before mass production.
- Authenticity Verification: Ensure packaging labels match XINGLIGHT formats; moisture-sensitive bags must be intact to prevent MSL 3 degradation.
- Sample Evaluation: Request samples from the specific batch to validate $\lambda_P$ alignment with your emitter diodes (typically 940nm).
❓ FAQ
Q: What is the peak detection wavelength of the XL-PD438C? A: The peak sensitivity wavelength ($\lambda_P$) is 940nm, making it ideal for standard infrared remote control applications and specific industrial optical switches.
Q: Can this component be used for high-reliability applications like medical devices? A: The datasheet lists medical equipment as a product application. However, for high-reliability fields (medical, aerospace, traffic control), you must consult with XINGLIGHT sales to review specific reliability data and compliance records beyond the standard datasheet.
Q: What are the storage requirements to maintain performance? A: Storage must be at temperatures not exceeding 30°C with relative humidity below 70%. It is recommended to use the component within 3 months of opening the original moisture-proof packaging.
Q: What is the recommended soldering profile to avoid damage? A: While the absolute max is 260°C for ≤6s, the best practice guideline suggests a maximum peak temperature of 240°C for ≤6 seconds during wave soldering. Do not apply mechanical pressure to the LED during heating.
Q: How should I handle the leads during assembly? A: Leads must be bent using a fixture or tool, ensuring the bend point is at least 2mm away from the colloid (epoxy body). Support forming must be completed prior to soldering.
