In the hardware development of switching power supplies, adapters, industrial control boards, security equipment and small home appliances, circuits such as high-voltage rectification, AC-DC conversion, freewheeling for inductive loads and surge protection require SMD rectifier diodes with sufficient withstand voltage, stable current and low leakage current. Slkor SM4007PL is a general-purpose silicon rectifier diode packaged in SOD-123FL. It features 1000V reverse withstand voltage and 1A continuous rectified current, along with excellent surge resistance, ultra-low reverse leakage current and an extra-wide junction temperature range. It serves as a cost-effective discrete component for high-voltage rectification in miniaturized equipment.

1. Core Electrical Parameters

1. Forward Voltage (Vf): 1.1V@1A
2. Reverse Voltage (Vr): 1kV
3. Average Rectified Current: 1A
4. Reverse Leakage Current (Ir): 5μA@1kV
5. Peak Forward Surge Current (Ifsm): 30A
6. Operating Junction Temperature Range: -50℃~+175℃
7. Package: SOD-123FL

2. Key Product Advantages

1. 1kV High Reverse Withstand Voltage for High-Voltage Operation

The SM4007PL provides a 1000V reverse blocking voltage. Compared with conventional low-voltage rectifier diodes, it can sustain higher AC peak voltages, suitable for secondary rectification of 220V AC input, high-voltage signal isolation, pulse voltage suppression and other applications. It delivers sufficient voltage margin and reduces the risk of reverse breakdown under high voltage.

2. Balanced Conduction Loss to Support Continuous 1A Rectification

The typical forward voltage drop is only 1.1V@1A with controllable conduction power loss, enabling stable continuous 1A rectification. It fits well in low-to-medium power rectifier circuits and maintains moderate temperature rise during long-term continuous operation, meeting the basic rectification demands of various adapters and module power supplies.

3. Ultra-Low 5μA Reverse Leakage Current to Reduce Idle Power Consumption

The reverse leakage current is as low as 5μA under rated withstand voltage, resulting in minimal static reverse power loss. For high-voltage standby equipment and battery-powered instruments, it effectively cuts standby power consumption and heat caused by leakage current, improving long-term circuit stability.

4. Outstanding Surge Resistance withstanding 30A Peak Current

Its peak forward surge current reaches 30A, capable of resisting inrush current at power-up, lightning-induced surges and instantaneous heavy current upon load turn-on. It is less vulnerable to damage from transient high current and enhances overall equipment anti-interference capability and reliability.

5. Extra-Wide Junction Temperature Range for Harsh Environments

The operating junction temperature covers -50℃~+175℃. It avoids failure under low temperature and maintains stable electrical performance at high temperatures, perfectly matching outdoor devices, industrial modules, automotive electronics and other products exposed to wide temperature fluctuations.

6. Compact SOD-123FL SMD Package Enabling Equipment Miniaturization

Adopting the SOD-123FL surface-mount package, it occupies limited PCB space. Compatible with standard SMT reflow soldering processes, it features good component interoperability and can directly replace equivalent SMD 1N4007 solutions to realize miniaturization upgrading and domestic substitution.

3. Typical Applications

1. Switching power supplies and adapters: secondary rectification and auxiliary power circuits of low-to-medium power AC-DC power supplies
2. Industrial control equipment: signal rectification for industrial control boards, freewheeling of relay coils and high-voltage circuit isolation
3. Smart home and small home appliances: lighting drivers, charging modules and rectifier circuits on control mainboards
4. Security electronics: power supply for cameras, access control devices and clamping protection of pulse signals
5. Instruments, meters and automotive peripherals: power supply rectification and surge absorption for portable testing equipment and vehicle auxiliary power supplies

4. Engineering Design Guidelines

1. Voltage and Current Derating Design

Reserve a safety margin of more than 30% for reverse operating voltage; avoid prolonged operation close to the 1kV voltage limit. Do not keep the average forward current continuously at full load of 1A. Appropriately derate current under high-power working conditions to prevent overheating. Calculate peak reverse voltage carefully for AC rectification circuits to avoid voltage spikes.

2. Surge and Thermal Management

Although the diode can withstand 30A surge current, add RC absorption circuits for circuits frequently subject to extreme transient impacts. Reserve adequate copper foil area on the PCB to improve heat dissipation and control junction temperature rise under high-temperature conditions.

3. PCB Layout and Polarity Identification

Distinguish component polarity strictly during assembly and soldering; the band-marked terminal is the cathode. Keep traces in rectifier circuits short and thick to lower line voltage drop. Maintain sufficient clearance between high-voltage zones and low-voltage weak-signal zones to prevent creepage.

4. Application Boundary Reminder

The SM4007PL is a general-purpose power-frequency rectifier diode and not suitable for high-frequency switching above tens of MHz. Fast recovery or ultra-fast recovery diodes should be selected for high-frequency rectification requirements.

5. Soldering Specification

Follow the standard reflow soldering temperature profile for SOD-123FL. Avoid prolonged excessive temperature baking which may degrade chip performance and ensure consistency during mass production.

5. Product Summary

The Slkor SM4007PL SMD rectifier diode integrates multiple strengths: 1kV high withstand voltage, 1A continuous rectified current, 5μA low reverse leakage current, 30A surge resistance and -50℃~+175℃ wide temperature operation, balancing withstand voltage, current capacity, impact resistance and stability across high and low temperatures.

Housed in the widely adopted SOD-123FL SMD package, it helps reduce equipment size when replacing through-hole 1N4007. It boasts great component compatibility and easy debugging. As a general-purpose high-voltage SMD rectifier device, it is extensively used in rectification and protection circuits of low-to-medium power power supplies, industrial modules and smart hardware, serving as a highly competitive domestic alternative for SMD high-voltage rectification schemes.

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