Microchip Technology SMAJ130E3/TR13

Overview

SMAJ130E3/TR13 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for primary and secondary lightning surge protection in DC power lines and signal interfaces. It features a 130 V reverse standoff voltage (V_WM), 144 V minimum breakdown voltage (V_BR), 231 A peak pulse current (I_PP @ 10/1000 µs), 231 V maximum clamping voltage (V_C), and 500 W peak pulse power dissipation - deployed in industrial power supplies, telecom line cards, and automotive body control modules.

For engineers reviewing the SMAJ130E3/TR13 datasheet, SMAJ130E3/TR13 pinout, SMAJ130E3/TR13 application, or SMAJ130E3/TR13 equivalent, key selection criteria include IEC61000-4-5 Class 1–4 secondary lightning compliance (with 12 Ω and 42 Ω source impedances), RoHS-compliant matte-tin plating, DO-214AC package thermal performance (15 °C/W junction-to-lead), and unidirectional polarity with cathode band marking.

Technical Context

This TVS diode operates as a clamping-type overvoltage protector, leveraging avalanche breakdown to divert surge energy away from downstream circuitry. Its <100 ps theoretical response time enables effective suppression of ESD per IEC61000-4-2 and fast transients per IEC61000-4-4, while its 130 V V_WM rating ensures compatibility with 110–125 VDC nominal systems such as PoE-powered equipment and railway signaling interfaces.

The device is rated for continuous operation from –65 °C to +150 °C, with 1.56 W steady-state power dissipation at 25 °C ambient on FR4 (1 oz Cu) and 5 W at lead temperature (T_L) = 75 °C. Its 42 Ω source impedance IEC61000-4-5 Class 1 rating applies specifically to SMAJ130E3/TR13, confirming suitability for high-energy surge environments without derating.

Key Specifications

Pinout & Package

DO-214AC (SMAJ) package with two terminals: anode and cathode. Cathode is marked by a visible band on the body. The package uses void-free thermosetting epoxy (UL94V-0), C-bend (modified J-bend) leads with RoHS-compliant annealed matte-tin plating, solderable per MIL-STD-750 Method 2026. Weight: 0.064 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ130E3/TR13, SMAJ130A-E3/5A offers identical electrical and mechanical specs with equivalent qualification paths, whereas 1.5SMC130A trades 2.6% lower I_PP and higher thermal resistance for broader distributor stock - requiring validation in high-reliability surge environments.

Availability

SMAJ130E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, and railway signaling interfaces requiring stable component supply, full RoHS compliance, and IEC61000-4-5 Class 1 surge immunity.

Supply support for SMAJ130E3/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 components for aerospace, defense, industrial, and communications markets.

The SMAJ series was developed for surface-mount transient suppression in space-constrained, high-surge environments - emphasizing low clamping voltage, fast response, and robust thermal performance in DO-214AC packaging.

FAQ

What is the clamping voltage of SMAJ130E3/TR13 at its rated peak pulse current?

The SMAJ130E3/TR13 has a maximum clamping voltage (V_C) of 231 V when subjected to its rated 231 A peak pulse current (I_PP) under the standard 10/1000 µs waveform. This value is measured per Figure 2 in the Microsemi datasheet and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SMAJ130E3/TR13 maintains this clamping performance across its full operating temperature range.

Is SMAJ130E3/TR13 compliant with IEC61000-4-5 for secondary lightning protection?

Yes, SMAJ130E3/TR13 is explicitly rated for IEC61000-4-5 secondary lightning protection with 42 Ω source impedance at Class 1 level, supporting up to 231 A peak pulse current. It also qualifies for Class 2 (≤16 A), Class 3 (≤24 A), and Class 4 (≤12 A) under the same standard using 42 Ω impedance, and for Class 1–2 with 12 Ω impedance. These ratings are confirmed in the "APPLICATIONS / BENEFITS" section of the Microsemi datasheet for SMAJ5.0–170CA, e3.

What does the "E3/TR13" suffix indicate in SMAJ130E3/TR13?

The "E3" suffix denotes RoHS-compliant matte-tin plating per JEDEC J-STD-020B Level 1 moisture sensitivity - eliminating the need for dry packing. The "TR13" indicates tape-and-reel packaging per EIA-481-1-A standard: 12 mm carrier tape, 750 units per 7-inch reel. This configuration ensures automated placement compatibility and humidity-safe handling without baking requirements prior to reflow.

Can SMAJ130E3/TR13 be used in bidirectional configurations?

No, SMAJ130E3/TR13 is a unidirectional TVS diode, as indicated by the absence of "C" or "CA" in its part number. Bidirectional variants (e.g., SMAJ130CA) are available separately and feature symmetrical clamping in both polarities. Using SMAJ130E3/TR13 in reverse-biased mode would result in forward conduction (~3.5 V drop) rather than controlled avalanche clamping, potentially damaging the device or failing to protect the circuit.

What is the thermal resistance specification for SMAJ130E3/TR13?

SMAJ130E3/TR13 has a junction-to-lead thermal resistance (R_θJL) of 15 °C/W and a junction-to-ambient resistance (R_θJA) of 80 °C/W when mounted on a standard FR4 PCB with 1 oz copper and the recommended footprint. This allows sustained 1.56 W power dissipation at 25 °C ambient or 5 W at 75 °C lead temperature - critical for thermal design in enclosed industrial enclosures where airflow is limited.