STMicroelectronics

SMAJ40A-TR

SMAJ40A-TR Description

The SMAJ40A-TR from STMicroelectronics is a unidirectional Zener-type TVS diode designed for transient voltage suppression in general-purpose applications. Part of the SMAJ, TRANSIL™ series, it offers robust protection with a 40V reverse standoff voltage (Typ) and a minimum breakdown voltage of 44.4V. The diode clamps transient voltages up to 84V at peak pulse current (27A, 8/20µs), ensuring reliable safeguarding of sensitive electronics. With a peak pulse power dissipation of 400W, it provides superior surge protection in compact SMA (DO-214AC) surface-mount packaging, making it ideal for space-constrained designs.

SMAJ40A-TR Features

• High Surge Capability: Handles 27A (8/20µs) peak pulse current and 400W peak power for robust transient suppression.
• Precise Voltage Clamping: Clamps at 84V max under surge conditions, minimizing stress on downstream components.
• Low Leakage: Optimized for efficiency with minimal power loss during normal operation.
• Surface-Mount Design: SMA package (Tape & Reel) ensures compatibility with automated assembly processes.
• Compliance: ROHS3, REACH Unaffected, and ECCN EAR99 certified, meeting global environmental and regulatory standards.
• Reliability: MSL 1 (Unlimited) moisture sensitivity ensures long-term stability in harsh environments.

SMAJ40A-TR Applications

• Industrial Electronics: Protects control systems, PLCs, and sensors from voltage spikes.
• Telecommunications: Shields communication lines (RS-485, Ethernet) from ESD and lightning-induced transients.
• Power Supplies: Safeguards DC-DC converters and voltage regulators against load-dump events.
• Automotive: Used in 12V/24V systems to mitigate surges from relays or inductive loads.
• Consumer Electronics: Defends USB ports, displays, and microcontrollers from transient disturbances.

Conclusion of SMAJ40A-TR

The SMAJ40A-TR stands out for its high-power handling, precise clamping, and compact form factor, making it a versatile choice for transient protection across industries. Its unidirectional design and compliance with stringent standards ensure reliability in demanding applications. Engineers favor this diode for its balance of performance and cost-effectiveness, particularly in space-sensitive or high-surge environments. For robust, general-purpose voltage suppression, the SMAJ40A-TR delivers exceptional protection with minimal footprint.