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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Microchip Technology SMAJ12E3/TR13

Name: SMAJ12E3/TR13
Brand: Microchip Technology
SKU: SMAJ12E3/TR13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMAJ12E3/TR13

Manufacturer:: Microchip Technology

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ12E3/TR13.pdf

Description:: TVS DIODE 12VWM 22VC DO214AC

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Product details

Overview

SMAJ12E3/TR13 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 500 W peak pulse power at 10/1000 µs, 12 V working standoff voltage (V_WM), 13.3 V minimum breakdown voltage (V_BR), and 22.0 V maximum clamping voltage (V_C) at 22.7 A peak pulse current - deployed for ESD/EFT protection on DC power rails and I/O lines in industrial control modules.

For engineers reviewing the SMAJ12E3/TR13 datasheet, SMAJ12E3/TR13 pinout, SMAJ12E3/TR13 application, or SMAJ12E3/TR13 equivalent, key selection criteria include verified clamping performance under IEC61000-4-2 Level 4 (±15 kV contact), compliance with IEC61000-4-5 secondary lightning (Class 4, 42 Ω source), RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR13 = 2500/reel).

Technical Context

This unidirectional TVS operates as a fast-acting shunt clamp: it remains high-impedance below 12 V (V_WM) and avalanches within <100 ps to limit transients to ≤22.0 V at 22.7 A. Its junction-to-lead thermal resistance is 15 °C/W, enabling reliable 5 W steady-state dissipation at 75 °C lead temperature when mounted per recommended FR4 footprint.

The device meets IEC61000-4-2 (ESD), IEC61000-4-4 (EFT), and IEC61000-4-5 (lightning surge) standards - specifically certified for Class 4 secondary lightning protection (42 Ω source) and Class 2 (12 Ω source) per Microsemi's published classification table, with no polarity marking required beyond cathode band.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	12 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; sets upper limit for protected line voltage.
V_BR min	13.3 V @ 1 mA - Confirmed avalanche onset threshold; ensures robust margin above V_WM.
V_C @ I_PP	22.0 V @ 22.7 A - Clamped voltage during full 500 W transient; determines maximum stress on downstream ICs.
P_PP	500 W @ 10/1000 µs - Peak surge handling capability; validated per Figure 1 derating curve.
I_D @ V_WM	≤1 μA - Low standby leakage ensures minimal power loss on always-on 12 V rails.
T_J range	−65 °C to +150 °C - Full operational range supports automotive under-hood and industrial ambient conditions.

Pinout & Package

DO-214AC (SMA) surface-mount package with C-bend (modified J-bend) leads, void-free UL94V-0 epoxy body, and cathode-indicating band. Weight: 0.064 g. Moisture sensitivity level: MSL 1 - no dry pack required.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Transient return path	Connected to ground or low-impedance reference; carries full surge current during clamping.
Cathode	Protected line connection	Connected to 12 V rail or signal line; voltage referenced to anode during suppression event.

Key Features

Feature	Design Value
RoHS-compliant matte-tin plating	Meets IPC/JEDEC J-STD-020B solderability requirements at 260 °C for 10 s - enables lead-free reflow compatibility.
100% moisture sensitivity level 1	Eliminates bake-out prior to assembly - reduces manufacturing cost and avoids thermal stress on components.
Fast response time	<100 ps theoretical turn-on - intercepts ESD events before sensitive CMOS inputs reach destructive thresholds.
Stable clamping under surge repetition	0.01% impulse duty factor rating - supports repeated surge testing without parameter drift or degradation.

Applications

Industrial PLC I/O Protection	Automotive Body Control Module (BCM)
Use Scenario: 12 V CAN bus and sensor input lines exposed to load dump and ESD in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional shunt clamp on 12 V supply rail and analog/digital I/O traces. Use Value: Limits transients to ≤22.0 V, protecting microcontrollers and CAN transceivers rated for 36 V absolute max.	Use Scenario: Power distribution network in BCM where alternator load dump (ISO 7637-2 Pulse 5a) induces >100 V spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp on fused 12 V feed to MCU and peripheral drivers. Use Value: Withstands 500 W surges while maintaining V_C ≤22.0 V - prevents latch-up or gate oxide rupture in 3.3 V/5 V logic.
Telecom Power Supply Input	Medical Diagnostic Equipment Interface
Use Scenario: Secondary-side 12 V DC-DC output feeding FPGA and ADC subsystems in base station power supplies. IC Role / Device Role / Timing Role: Final-stage transient suppressor before LDO regulators and precision analog front-ends. Use Value: Sub-μA leakage at 12 V preserves efficiency; 22.0 V clamping ensures ADC reference stability during EFT bursts.	Use Scenario: Patient-connected USB and RS-232 ports in ultrasound machines requiring IEC 60601-1-2 compliance. IC Role / Device Role / Timing Role: Signal-line TVS on isolated data interfaces adjacent to high-voltage imaging circuits. Use Value: Validated for IEC61000-4-2 Level 4 (±15 kV contact) - meets essential immunity requirements without adding isolation complexity.

Industrial PLC I/O Protection

Automotive Body Control Module (BCM)

Use Scenario: 12 V CAN bus and sensor input lines exposed to load dump and ESD in factory automation cabinets.

IC Role / Device Role / Timing Role: Unidirectional shunt clamp on 12 V supply rail and analog/digital I/O traces.

Use Value: Limits transients to ≤22.0 V, protecting microcontrollers and CAN transceivers rated for 36 V absolute max.

Use Scenario: Power distribution network in BCM where alternator load dump (ISO 7637-2 Pulse 5a) induces >100 V spikes.

IC Role / Device Role / Timing Role: Primary overvoltage clamp on fused 12 V feed to MCU and peripheral drivers.

Use Value: Withstands 500 W surges while maintaining V_C ≤22.0 V - prevents latch-up or gate oxide rupture in 3.3 V/5 V logic.

Telecom Power Supply Input

Medical Diagnostic Equipment Interface

Use Scenario: Secondary-side 12 V DC-DC output feeding FPGA and ADC subsystems in base station power supplies.

IC Role / Device Role / Timing Role: Final-stage transient suppressor before LDO regulators and precision analog front-ends.

Use Value: Sub-μA leakage at 12 V preserves efficiency; 22.0 V clamping ensures ADC reference stability during EFT bursts.

Use Scenario: Patient-connected USB and RS-232 ports in ultrasound machines requiring IEC 60601-1-2 compliance.

IC Role / Device Role / Timing Role: Signal-line TVS on isolated data interfaces adjacent to high-voltage imaging circuits.

Use Value: Validated for IEC61000-4-2 Level 4 (±15 kV contact) - meets essential immunity requirements without adding isolation complexity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ12A-E3/52 (Vishay)	Identical V_WM (12 V), V_BR min (13.3 V), V_C (22.0 V), and P_PP (500 W); same DO-214AC package and RoHS plating.	No functional deviation; qualified for same IEC61000-4-x standards and mounting footprint.	Select when dual-sourcing or second-source qualification is required without layout change.
1.5SMC12A (ON Semiconductor)	Same V_WM and V_C, but rated for 1500 W peak power (10/1000 µs) and larger DO-214AB package (5.3 mm x 4.6 mm vs. SMAJ's 4.5 mm x 2.8 mm).	Higher surge capacity suits harsher environments (e.g., railway traction), but requires PCB pad revision and increases board area.	Choose only if system-level surge testing exceeds 500 W or legacy 1.5SMC footprint is already in use.

Compared with SMAJ12E3/TR13, SMAJ12A-E3/52 offers identical electrical and mechanical specs for seamless substitution, while 1.5SMC12A trades compactness for higher surge headroom - making SMAJ12E3/TR13 optimal for space-constrained 12 V rail protection where 500 W compliance is sufficient.

Availability

SMAJ12E3/TR13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom power supply inputs requiring stable component supply, RoHS compliance, and IEC61000-4-2/4-4/4-5 certification.

Supply support for SMAJ12E3/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets, with emphasis on ruggedized protection and timing solutions.

The SMAJ series targets surface-mount transient suppression in space- and thermally constrained applications, delivering 500 W surge capability in the industry-standard DO-214AC footprint for rapid integration into high-volume electronics.

FAQ

What is the clamping voltage of SMAJ12E3/TR13 at its rated peak pulse current?

The SMAJ12E3/TR13 has a maximum clamping voltage (V_C) of 22.0 V when subjected to its rated 22.7 A peak pulse current (I_PP) under the standard 10/1000 µs waveform. This value is measured per Figure 2 in the Microsemi datasheet MSC0270A and defines the upper voltage limit imposed on protected circuitry during a full 500 W transient event.

Is SMAJ12E3/TR13 unidirectional or bidirectional, and how is polarity indicated?

SMAJ12E3/TR13 is a unidirectional TVS diode, with polarity indicated by a cathode band on the package body. The "E3" suffix confirms RoHS-compliant matte-tin plating, and the absence of "C" or "CA" in the part number confirms unidirectional construction. Bidirectional variants (e.g., SMAJ12CA) would carry explicit "CA" suffixes and lack polarity marking.

Does SMAJ12E3/TR13 meet IEC61000-4-5 Class 4 lightning surge requirements?

Yes, SMAJ12E3/TR13 is explicitly rated for IEC61000-4-5 Class 4 secondary lightning protection with a 42 Ω source impedance, as documented in the Microsemi datasheet MSC0270A. This classification applies to devices from SMAJ5.0 through SMAJ12A or CA, confirming suitability for high-immunity industrial and infrastructure applications.

What is the maximum steady-state power dissipation of SMAJ12E3/TR13 on a standard FR4 PCB?

When mounted on an FR4 printed circuit board with 1 oz copper and Microsemi's recommended footprint, SMAJ12E3/TR13 dissipates up to 5 W continuously at a lead temperature (T_L) of 75 °C, or 1.56 W at ambient temperature (T_A) of 25 °C. These values derive from its 15 °C/W junction-to-lead thermal resistance and are specified in the Maximum Ratings table.

What does the "TR13" suffix indicate in SMAJ12E3/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" option (750/reel on 7-inch reel). The "E3" portion separately indicates RoHS-compliant matte-tin terminal plating.

SMAJ12E3/TR13 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Package/Case:: DO-214AC, SMA

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 12V

Voltage - Breakdown (Min):: 13.3V

Voltage - Clamping (Max) @ Ipp:: 22V

Current - Peak Pulse (10/1000µs):: 22.7A

Power - Peak Pulse:: 500W

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: -

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

SMAJ12E3/TR13 FAQ

1.How can I place an order for SMAJ12E3/TR13 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ12E3/TR13 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SMAJ12E3/TR13 reliable?

The price and inventory of SMAJ12E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ12E3/TR13 is usually 5 days.

3.What payment methods are accepted for SMAJ12E3/TR13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12E3/TR13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ12E3/TR13?

SMAJ12E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ12E3/TR13 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SMAJ12E3/TR13?

For technical support, including SMAJ12E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12E3/TR13 requirements.

6.How does Aetrix verify that SMAJ12E3/TR13 is sourced from the original manufacturer or authorized distributors?

All SMAJ12E3/TR13 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMAJ12E3/TR13 meets industry standards.

7.What is the process for return or replacement of SMAJ12E3/TR13?

All SMAJ12E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12E3/TR13, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SMAJ12E3/TR13 part is unused and in its original packaging.

Return procedure for SMAJ12E3/TR13:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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