Littelfuse 1-Element Uni-Directional TVS Diode 400 W, 2-Pin DO-214 SMAJ51A

Littelfuse SMAJ51A is a 1-Element Uni-Directional Transient Voltage Suppression (TVS) Diode delivering 400 W peak pulse power dissipation in a compact DO-214 surface mount package with 2 pins. It is engineered for the protection of sensitive semiconductor devices from damaging voltage transients caused by lightning, electrostatic discharge, and inductive load switching.

The diode features a single unidirectional element providing effective voltage clamping with a minimum breakdown voltage of 56.7 V and a maximum reverse stand-off voltage of 51 V. With a clamping voltage of 82.4 V, it safeguards circuits from transient spikes while maintaining low incremental surge resistance to minimize impact on normal operations.

The SMAJ51A sustains peak pulse current of up to 4.9 A and fast response time typically under 1 picosecond, ensuring prompt reactive protection. Its glass passivated junction and low inductance design improve reliability and performance consistency over time. Halogen-free construction aligns with modern safety and environmental regulations.

The compact physical dimensions measuring 4.6 mm length, 2.79 mm width, and 2.08 mm height make it suitable for surface mounting on printed circuit boards, facilitating space-efficient electronic assemblies. It is rated for operating temperatures ranging from -65°C to 150°C, catering to demanding industrial, electronic, and automotive applications.

The device can withstand high temperature soldering of 250°C for 10 seconds at terminals without performance degradation, supporting robust manufacturing processes. It is broadly used in power management, telecommunications, industrial controls, and consumer electronics to prevent transient voltage damage.

Single diode configuration providing unidirectional transient voltage suppression. Minimum breakdown voltage of 56.7 V ensures reliable clamping performance. Maximum reverse stand-off voltage rated at 51 V for normal operation.

Peak pulse current capability up to 4.9 A to handle surge events effectively. Compact dimensions with length 4.6 mm, width 2.79 mm, height 2.08 mm for space-optimized PCB mounting. Operates efficiently across temperature from -65°C to 150°C for industrial-grade reliability.

Fast response time typically less than 1 picosecond to voltage transients. Glass passivated junction and low inductance structure for consistent performance. Halogen-free materials compliant with modern environmental standards.

High temperature soldering withstands 250°C for 10 seconds at terminals.

Ideal for industrial electronics, telecommunications equipment, power supplies, automotive electronics, and other applications requiring robust transient voltage protection. Explore our complete range of semiconductor protection devices and related electronic components at EnvMart for optimized designs.

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