Microchip Technology SMAJ90E3/TR13

Overview

SMAJ90E3/TR13 from Microsemi is a unidirectional surface-mount Transient Voltage Suppressor (TVS) designed for primary and secondary lightning surge protection in DC power rails and signal lines. It features a 90 V standoff voltage (V_WM), 100 V minimum breakdown voltage (V_BR), 160 V maximum clamping voltage at 14.6 A peak pulse current, 500 W peak pulse power rating at 10/1000 µs, and operates across –65 °C to +150 °C. It is deployed in industrial power supplies and telecom interface circuits requiring IEC 61000-4-5 compliance.

For engineers reviewing the SMAJ90E3/TR13 datasheet, SMAJ90E3/TR13 pinout, SMAJ90E3/TR13 application, or SMAJ90E3/TR13 equivalent, this page delivers verified electrical parameters, RoHS-compliant packaging details, IEC 61000-4-2/4-4/4-5 test alignment, clamping performance under standardized surge waveforms, and validated alternatives for ESD/EFT/inductive switching protection design.

Technical Context

This unidirectional TVS diode uses silicon avalanche junction technology to clamp transient overvoltages within nanoseconds. Its response time is <100 ps from 0 V to V_BR, enabling effective suppression of ESD events per IEC 61000-4-2 (±8 kV contact, ±15 kV air) and fast EFT bursts per IEC 61000-4-4 (40 A, 5/50 ns).

The device is rated for 500 W peak pulse power at 10/1000 µs waveform with 0.01% duty cycle, supports 40 A forward surge current (8.3 ms half-sine), and exhibits ≤3.1 µA standby leakage at 90 V. Thermal resistance is 15 °C/W junction-to-lead when soldered to recommended FR4 footprint.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA) - Surface-mount plastic package with void-free thermosetting epoxy body (UL94V-0), C-bend leads, matte-tin plating, and cathode band marking. Dimensions: 4.93–5.48 mm length × 3.99–4.50 mm width × 2.26 mm height (max). Moisture sensitivity level: Level 1 (no dry pack required).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ90A and SMBJ90A, SMAJ90E3/TR13 uniquely combines RoHS compliance, industry-standard SMA footprint, and verified 500 W IEC 61000-4-5 Class 1 capability-making it optimal for new industrial and telecom designs requiring regulatory alignment and compact layout.

Availability

SMAJ90E3/TR13 is available at Aetrix Electronics and suitable for industrial power input protection, telecom line interface, automotive body control modules, and renewable energy inverter DC link applications requiring stable component supply and full traceability.

Supply support for SMAJ90E3/TR13 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

Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal ICs, radiation-hardened devices, and discrete protection components.

The SMAJ series was engineered for robust, surface-mount transient suppression in harsh environments-targeting industrial automation, aerospace, telecom infrastructure, and energy systems where failure resilience is mission-critical.

FAQ

What is the clamping voltage of SMAJ90E3/TR13 at its rated peak pulse current?

The SMAJ90E3/TR13 has a maximum clamping voltage (V_C) of 160 V at 14.6 A peak pulse current (I_PP) under the standardized 10/1000 µs waveform. This value is measured per Figure 2 in the official Microsemi datasheet MSC0270A and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ90E3/TR13 maintains this clamping performance across its full operating temperature range.

Is SMAJ90E3/TR13 unidirectional or bidirectional?

SMAJ90E3/TR13 is a unidirectional Transient Voltage Suppressor, indicated by the absence of "C" or "CA" in its part number suffix. It conducts only during positive voltage excursions relative to its cathode-marked terminal and blocks reverse current up to 90 V. Bidirectional variants (e.g., SMAJ90CA) are separate part numbers with symmetrical clamping in both polarities.

Does SMAJ90E3/TR13 meet IEC 61000-4-5 for lightning surge immunity?

Yes, SMAJ90E3/TR13 is rated for secondary lightning protection per IEC 61000-4-5 with 42 Ω source impedance up to Class 1 (1 kV open-circuit, 0.5 Ω source), and with 12 Ω source impedance up to Class 2 (1 kV open-circuit, 0.5 Ω source). Its 500 W peak pulse power and 160 V clamping voltage ensure compliance when applied with proper PCB layout and grounding per Microsemi's recommended footprint.

What is the maximum steady-state power dissipation of SMAJ90E3/TR13?

The SMAJ90E3/TR13 dissipates up to 5 W continuously at lead temperature (T_L) of 75 °C, or 1.56 W at ambient temperature (T_A) of 25 °C when mounted on an FR4 PCB with 1 oz copper and Microsemi's recommended pad layout. This steady-state rating applies only during non-transient conditions and must be derated linearly above 75 °C per the datasheet's derating curve (Figure 3).

What does the "TR13" suffix indicate in SMAJ90E3/TR13?

The "TR13" suffix denotes tape-and-reel packaging per EIA-481-1-A standard: 12 mm carrier tape, 2500 units per 13-inch reel. This format supports automated SMT placement and is distinct from the "TR" variant (750 units per 7-inch reel). The "E3" portion confirms RoHS-compliant matte-tin plating, while "SMAJ90" identifies the 90 V standoff voltage and SMA package family.