onsemi

MMSZ5V1T1

MMSZ5V1T1 Description

The MMSZ5V1T1 from onsemi is a 5.1V Zener diode designed for surface-mount applications, packaged in a compact SOD-123 form factor. With a nominal Zener voltage (Vz) of 5.1V (±5% tolerance) and a maximum power dissipation of 500 mW, this diode is optimized for voltage regulation, clamping, and transient suppression in low-power circuits. It features a low forward voltage (900 mV @ 10 mA) and minimal reverse leakage current (2 µA @ 2 V), ensuring efficient performance in precision applications. The device is RoHS-compliant, REACH-unaffected, and rated for MSL 1 (unlimited shelf life), making it suitable for industrial and consumer electronics.

MMSZ5V1T1 Features

• Precision Voltage Regulation: Tight tolerance (±5%) ensures stable 5.1V reference.
• Low Leakage: Only 2 µA reverse leakage at 2V enhances power efficiency.
• High Power Handling: 500 mW max dissipation for robust performance.
• Compact SOD-123 Package: Ideal for space-constrained PCB designs.
• Low Forward Voltage: 900 mV @ 10 mA reduces power loss in forward bias.
• Low Dynamic Impedance (Zzt): 60 Ω max improves transient response.
• Wide Operating Range: Suitable for -55°C to +150°C environments.
• Tape & Reel (TR) Packaging: Facilitates automated assembly processes.

MMSZ5V1T1 Applications

• Voltage Clamping: Protects sensitive ICs from overvoltage in USB ports, GPIOs, and data lines.
• Power Supply Regulation: Stabilizes voltage in low-current DC-DC converters and LDO replacements.
• Signal Conditioning: Used in ADC/DAC reference circuits for precision measurement systems.
• Consumer Electronics: TV, smartphones, and wearables requiring compact voltage regulation.
• Automotive Electronics: ECU and sensor interfaces where reliability is critical.
• Industrial Controls: PLCs and instrumentation requiring stable voltage references.

Conclusion of MMSZ5V1T1

The MMSZ5V1T1 stands out as a high-reliability, low-leakage Zener diode for precision voltage regulation. Its SOD-123 package, low dynamic impedance, and robust power handling make it superior to generic diodes in space-sensitive and efficiency-driven designs. While marked obsolete, it remains a viable choice for legacy systems or applications demanding proven performance. Engineers should verify alternative part availability for new designs but can rely on this diode for stable, low-noise voltage control in existing implementations.