Slkor B5819WS Schottky Barrier Diode: 40V SOD‑323

B5819WS is a SOD-323 packaged Schottky barrier diode from Slkor. It is suitable for low-voltage and high-frequency circuits for free-wheeling and polarity protection. The device adopts molded plastic surface-mount package with solder-compliant terminals and polarity marking on case. It fits surface-mount design for consumer electronics and compact industrial circuit boards.

1. Core Product Parameters

1. Package type: SOD-323 surface-mount molded package.
2. Working peak reverse voltage: 40V.
3. Peak forward surge current: 14A under 8.3ms condition.
4. Repetitive peak forward current: 625mA.
5. Power dissipation: 200mW.
6. Junction-to-ambient thermal resistance: 625K/W.
7. Forward voltage: 0.9V, tested at forward current of 1A.
8. Polarity mark is printed on device case; plated terminals comply with standard soldering requirements.
9. Reference test condition: ambient temperature of 25℃.

2. Key Product Features

1. Schottky-barrier diode structure, optimized for low-voltage high-frequency scenarios.
2. Compact SOD-323 surface-mount package to save PCB layout space.
3. Capable of withstanding short-term forward surge current against transient current impulse.
4. Polarity symbol printed on device housing for easy orientation identification during assembly.
5. Plated terminal finish meets standard solderability specification and fits SMD reflow soldering process.

3. Main Application Fields

1. Low-voltage high-frequency inverter circuits.
2. Free-wheeling protection for various circuits.
3. Power supply reverse-polarity protection on circuit boards.
4. Power loops of small-size consumer electronic devices.
5. Miniaturized rectification design for signal loops and secondary side of switching power supplies.

4. Engineering Design Recommendations

1. Current derating: Actual average forward operating current shall not exceed rated value. Further current derating is required for high-temperature operation referring to forward-current derating curve.
2. Surge current consideration: For circuits with transient surge impulse, the peak forward surge current is limited to 14A under 8.3ms. Continuous surge stress shall be avoided to prevent device damage.
3. Polarity check for soldering: Polarity mark is printed on SOD-323 package. Verify device orientation before SMD soldering to avoid circuit failure caused by reverse installation.
4. Thermal management: This component has relatively high junction-to-ambient thermal resistance. Monitor case temperature under heavy-load operation and control junction temperature to prevent thermal failure.
5. High-frequency usage: When deployed for high-frequency applications, pay attention to the impact of diode junction capacitance and evaluate signal distortion according to operating frequency.

5. Product Summary

B5819WS is a 40V SOD-323 surface-mount Schottky barrier diode, targeted for low-voltage high-frequency circuits for free-wheeling and polarity protection. Its small surface-mount package supports compact PCB layout and provides certain surge-withstanding capability. In engineering practice, implement proper current derating, confirm soldering polarity and control operating temperature. Operated within absolute maximum ratings, it reliably performs rectification, free-wheeling and reverse-polarity protection functions.

About Slkor：

SLKOR's product portfolio includes discrete semiconductor devices such as diodes, transistors, and power devices, as well as integrated circuits such as linear regulators, DC-DC converters, interface chips, Hall sensors, ADCs, and battery management systems (BMS)

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