Vishay General Semiconductor - Diodes Division SMBJ90A-E3/52

Overview

SMBJ90A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 90 V standoff voltage (V_WM), 100 V minimum breakdown voltage (V_BR), and clamps transients to 146 V at 4.1 A peak pulse current (I_PPM) under 10/1000 μs waveform - deployed in industrial motor drives, telecom power supplies, and automotive body control modules.

For engineers reviewing the SMBJ90A-E3/52 datasheet, SMBJ90A-E3/52 pinout, SMBJ90A-E3/52 application, or SMBJ90A-E3/52 equivalent, key selection criteria include its 600 W peak pulse power rating, low 1.0 μA reverse leakage at V_WM, RoHS-compliant SMB (DO-214AA) package, and AEC-Q101 qualification readiness via HE3 suffix variants.

Technical Context

This unidirectional TVS operates as a clamping device in parallel with protected circuitry, conducting only when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable V_BR tolerance (±10%), fast response time (<1 ns), and low incremental surge resistance - critical for suppressing ESD, lightning-induced surges, and inductive switching spikes.

The SMBJ90A-E3/52 is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Fig. 2 of the datasheet. Thermal resistance is 100 °C/W junction-to-ambient (R_θJA) on standard 0.2" × 0.2" copper pads, enabling reliable operation in high-temperature industrial environments without forced cooling.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA) - Surface-mount, low-profile plastic case with matte tin-plated leads, UL 94 V-0 rated molding compound, MSL Level 1 (260 °C reflow peak).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMBJ90A-E3/52, the M3 variant adds halogen-free compliance without altering protection performance, while the HM3_B/I version delivers full automotive qualification - enabling direct migration from industrial to automotive platforms with verified reliability data and extended lifecycle support.

Availability

SMBJ90A-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, consistent RoHS compliance, and broad distributor stocking.

Supply support for SMBJ90A-E3/52 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power handling, and automotive-grade qualification.

The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where robustness and repeatable clamping performance are non-negotiable.

FAQ

What is the clamping voltage of SMBJ90A-E3/52 at its rated peak pulse current?

The SMBJ90A-E3/52 clamps to a maximum of 146 V at its specified peak pulse current of 4.1 A under the standardized 10/1000 μs waveform. This value is measured per Figure 1 and Table 1 of Vishay Document 88392 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ90A-E3/52 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) with minimal variation.

Is SMBJ90A-E3/52 suitable for bidirectional transient protection?

No, SMBJ90A-E3/52 is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SMBJ90CA). Using SMBJ90A-E3/52 in AC or symmetrical surge applications would result in forward conduction during negative half-cycles, potentially causing failure. Always verify polarity alignment in schematic and layout for the SMBJ90A-E3/52.

What is the thermal resistance and recommended PCB layout for SMBJ90A-E3/52?

The SMBJ90A-E3/52 has a typical junction-to-ambient thermal resistance (R_θJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as defined in the datasheet's "Maximum Ratings" table. To achieve this, use solid copper pours tied to both terminals with ≥2 thermal vias per pad. Avoid narrow traces or isolated pads - the SMBJ90A-E3/52 relies on PCB copper for heat dissipation during repetitive surge events.

Does SMBJ90A-E3/52 meet automotive qualification standards?

The base SMBJ90A-E3/52 is commercial-grade and not AEC-Q101 qualified. However, Vishay offers the automotive-qualified variant SMBJ90AHM3_B/I (halogen-free, AEC-Q101) and SMBJ90AHE3_B/I (RoHS-compliant AEC-Q101), both sharing identical electrical parameters and SMB package. If automotive use is intended, specify the HE3 or HM3 suffix with appropriate revision code - the SMBJ90A-E3/52 itself is intended for industrial and telecom applications.

How does the 1.0 μA maximum reverse leakage at 90 V affect system design?

The 1.0 μA maximum reverse leakage current at V_WM = 90 V ensures negligible power loss and no measurable impact on high-impedance bias networks or battery-backed circuits. This allows the SMBJ90A-E3/52 to be used directly on always-on rails (e.g., real-time clock backup supplies or sensor excitation lines) without compromising accuracy or standby current budgets. Designers can rely on this spec to eliminate additional leakage compensation in precision analog front-ends using the SMBJ90A-E3/52.