Overview
The SMBJ90(C)A is a surface-mount TVS diode in the SMB (DO-214AA) package, designed to safeguard electronic circuits from transient voltage events such as electrostatic discharge (ESD) and lightning surges. It operates by clamping excessive voltage to a safe level, thereby preventing damage to downstream components. Widely used in industrial control systems, automotive electronics, and communication devices, this diode offers a reliable first line of defense. Its compact size and compliance with international standards (e.g., IEC 61000-4-2/4/5) make it a preferred choice for modern high-density PCB designs.
Structure and Working Principle
The SMBJ90(C)A consists of a silicon avalanche breakdown junction housed in a lead-free, epoxy-coated SMB package. When the voltage across the diode exceeds its breakdown threshold (90V for the SMBJ90A variant), it enters a low-impedance state, diverting the surge current away from the protected circuit. Its bidirectional variant (SMBJ90CA) protects against both positive and negative transients, while the unidirectional type (SMBJ90A) is optimized for DC applications. The diode’s fast response time (<1 ns) ensures minimal overshoot during clamping.
Key Features
The SMBJ90(C)A stands out for its low clamping voltage (typically 146V at 10A), which minimizes stress on protected components. Its peak pulse power dissipation of 600W (10/1000μs waveform) suits demanding environments. Additional advantages include RoHS compliance, wide operating temperature range (-55°C to +150°C), and compatibility with automated pick-and-place assembly. These features make it a cost-effective solution for high-volume production.
Application Areas
Primary applications include power supply lines (AC/DC converters), data/communication ports (USB, Ethernet), and automotive systems (CAN bus, infotainment). It is also deployed in industrial automation (PLC I/O modules) and renewable energy systems (solar inverters). In telecommunications, the diode protects base station equipment from lightning-induced surges. Its robustness and reliability align with ISO 7637-2 standards for automotive pulse immunity.
Maintenance and Precautions
The SMBJ90(C)A requires no routine maintenance but should be inspected for physical damage after surge events. Ensure proper PCB layout: minimize trace lengths between the diode and protected node to reduce parasitic inductance. Avoid prolonged exposure to voltages near the breakdown threshold, as this may degrade performance. Storage conditions should adhere to standard moisture sensitivity levels (MSL 1, for reference).
B2B Procurement Guide
When procuring SMBJ90(C)A diodes, verify certifications (AEC-Q101 for automotive use) and test reports (IEC surge compliance). Bulk purchases (reels of 3,000 units) typically offer 20-30% cost savings. Partner with authorized distributors to avoid counterfeit products. For custom requirements (e.g., tighter voltage tolerances), consult manufacturers for tailored solutions. Lead times vary but generally range from 2-8 weeks for large orders.
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