📌 Product Overview
The XL4502 is a high-speed optocoupler 💡 integrating an AlGaAs LED and a photodetector to support signal transmission rates up to 1MBit/s. It is designed to provide reliable electrical isolation in systems requiring high noise immunity and safety compliance. The device features an open-collector output configuration and is compliant with CQC, UL, and VDE standards.
Target applications primarily include industrial automation (PLCs, servo drives) and automotive electronics (BMS, EV charging). The design focus is on maintaining signal integrity while providing high isolation voltage (Viso=5000Vrms) across a wide operating temperature range of -40℃ to +100℃.
🔧 Typical Applications
This component is engineered for high-speed digital signal isolation in electrically noisy environments. Key application scenarios include:
- Industrial Automation & Control: PLCs, frequency converters, and industrial robotics requiring high-speed signal processing.
- Communications & Networking: Fiber optic communication interfaces and data center equipment.
- Power Electronics: Motor drive control, motor protection circuits, and energy management systems.
- Automotive Systems: In-vehicle networks, Battery Management Systems (BMS), and EV charging stations.
- Medical & Intelligent Transport: Medical equipment isolation and intelligent transportation system (ITS) infrastructure.
📏 Key Technical Specifications
The XL4502 delivers stable signal isolation performance under standard operating conditions (Ta = 25°C). The table below summarizes critical electrical and switching characteristics for design reference.
| Parameter | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Forward Voltage | VF | IF = 16mA | - | 1.45 | 1.7 | V |
| Current Transfer Ratio | CTR | VCC=4.5V, IF=16mA | 19 | 24 | 50 | % |
| Isolation Resistance | RIO | VIO = 500V | - | 1×10¹² | - | Ω |
| Floating Capacitance | CIO | f = 1MHz | - | 0.6 | - | pF |
| Propagation Delay | TPLH / TPHL | IF=16mA, RL=1.9KΩ | - | 600 / 200 | 800 | ns |
| Supply Current (High) | ICCH | VCC=15V, IF=0mA | - | - | 1 | µA |
| Supply Current (Low) | ICCL | VCC=15V, IF=16mA | - | 50 | 200 | µA |
🚨 Absolute Maximum Ratings & Process Limits
Exceeding these ratings may cause permanent damage to the device. 👇 These limits are critical for stress testing and ensuring long-term reliability in harsh environments.
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Input Forward Current (Avg) | IF(avg) | 25 | mA |
| Input Forward Current (Peak) | IF(pk) | 50 | mA |
| Input Reverse Voltage | VR | 5 | V |
| Supply Voltage | VCC | -0.5 ~ 30 | V |
| Output Current | IO | 8 | mA |
| Output Voltage | VO | -0.5 ~ 20 | V |
| Isolation Voltage | VISO | 5000 | Vrms |
| Operating Temperature | TOPR | -40 ~ +100 | °C |
| Storage Temperature | TSTG | -55 ~ +125 | °C |
| Soldering Temperature | TSOL | 260 | °C (for 10s) |
📦 Package, Dimensions & Assembly Notes
The XL4502 is available in three distinct package configurations to accommodate various assembly processes. The molding compound utilizes a UL94V-0 flammability rating, and terminals feature matte tin-plated leads for solderability per MIL-STD-202.
Package Options:
- DIP8: Through-hole mounting; shipped in tubes (45 pcs).
- DIP8-M: Modified through-hole; shipped in tubes (45 pcs).
- SMD8: Surface mount device; shipped in Tape & Reel (1000 pcs).
Assembly Considerations: 💡
- Reflow Soldering: Recommended peak temperature (Tp) of 260°C. Time above 217°C liquidus should be controlled between 60-150 seconds.
- Wave Soldering: Average ramp-up rate ~200°C/s. Preheat temperature profile must be strictly adhered to avoid thermal shock.
🛒 Sourcing & Supply Considerations
When integrating the XL4502 into BOMs, verify the specific packaging code (e.g., *1 for DIP8, *1S for SMD8) to match assembly lines.
- Lead Times: Tape & Reel (SMD8) options are optimized for high-volume automated pick-and-place, reducing assembly time compared to tube packaging.
- Authenticity: Cross-reference the marking code (Year/Week format) on the component body to ensure traceability and avoid counterfeit components.
- Evaluation Samples: Request samples in the DIP8-M format for initial prototyping before committing to SMD volume production.
❓ Frequently Asked Questions
Q: What is the maximum data transmission speed of the XL4502?
A: The XL4502 is designed to handle data rates up to 1MBit/s, making it suitable for high-speed digital communication interfaces like CAN buses or industrial fieldbus protocols.
Q: Can this optocoupler be used in high-temperature automotive environments?
A: Yes, it supports an operating temperature range of -40℃ to +100℃, which meets the requirements for many automotive electronics applications such as Battery Management Systems (BMS) and in-vehicle networks.
Q: What is the difference between the DIP8, DIP8-M, and SMD8 package options?
A: DIP8 and DIP8-M are through-hole packages suitable for manual assembly or specific socket requirements (shipped in tubes). The SMD8 package is designed for surface mount technology (SMT) and comes in Tape & Reel format for automated assembly.
Q: What safety standards does the XL4502 comply with?
A: The device is environmentally friendly and compliant with CQC, UL, and VDE requirements, providing a recognized safety standard for isolation components in industrial and medical equipment.
Q: How does the Common Mode Transient Immunity (CMTI) affect performance?
A: The XL4502 exhibits high noise immunity with a CMTI of 1000 V/µs for both high and low output levels. This ensures stable signal transmission even in environments with significant electrical noise or fast voltage transients.
