Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Microchip Technology SMAJ7.0E3/TR13

Name: SMAJ7.0E3/TR13
Brand: Microchip Technology
SKU: SMAJ7.0E3/TR13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SMAJ7.0E3/TR13

Manufacturer:: Microchip Technology

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ7.0E3/TR13.pdf

Description:: TVS DIODE 7VWM 13.3VC DO214AC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,890

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SMAJ7.0E3/TR13 from Microsemi is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary and secondary surge protection in DC power rails and signal lines. It features a 7.0 V reverse standoff voltage (V_WM), 7.78 V minimum breakdown voltage (V_BR), 13.3 V maximum clamping voltage (V_C) at 37.8 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in industrial power supplies, automotive ECUs, and telecom interface circuits.

For engineers reviewing the SMAJ7.0E3/TR13 datasheet, SMAJ7.0E3/TR13 pinout, SMAJ7.0E3/TR13 application, or SMAJ7.0E3/TR13 equivalent, key selection criteria include clamping performance under IEC61000-4-5 (42 Ω source), low standby leakage (<200 µA @ V_WM), RoHS-compliant matte-tin plating, and compatibility with automated SMT assembly on FR4 boards using standard DO-214AC footprint.

Technical Context

This TVS operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 7.78 V breakdown threshold (I_BR = 10 mA). Its <100 ps theoretical response time enables effective suppression of ESD (IEC61000-4-2) and EFT (IEC61000-4-4) events before sensitive downstream ICs are damaged.

Thermal design relies on low junction-to-lead thermal resistance (15 °C/W) and recommended PCB copper land pattern for heat dissipation. The device sustains 5 W steady-state power at 75 °C lead temperature and withstands 40 A forward surge (8.3 ms half-sine) with ≤3.50 V forward voltage - critical for protecting rectifier stages and MOSFET gate drivers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	7.0 V - Maximum continuous reverse operating voltage before conduction begins; sets DC rail protection threshold.
V_BR min	7.78 V @ 10 mA - Minimum avalanche onset voltage; ensures reliable triggering above nominal rail.
V_C max	13.3 V @ 37.8 A - Clamped voltage during 10/1000 µs surge; defines worst-case stress on protected ICs.
P_PP	500 W - Peak pulse power handling capability; validates robustness against lightning-induced transients.
I_PP	37.8 A - Peak surge current supported at rated clamping voltage; determines minimum series impedance needed.
I_D max	200 µA @ 7.0 V - Reverse leakage at standoff voltage; impacts low-power sensor node quiescent current budget.
T_J range	–65 °C to +150 °C - Operating junction temperature range; supports under-hood automotive and industrial environments.

Pinout & Package

Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy body (UL94V-0), C-bend leads with RoHS-compliant annealed matte-tin plating. Cathode indicated by band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Low-side connection to protected circuit ground	Provides return path for surge current; must connect to low-impedance ground plane for effective clamping.
Cathode	High-side connection to protected line (e.g., V_IN, signal)	Accepts transient energy from upstream source; polarity marking ensures correct orientation in series protection.

Key Features

Feature	Design Value
500 W peak pulse power	Enables single-device protection against IEC61000-4-5 Class 4 (12 Ω source) surges up to 1 kV on 12 V systems.
<100 ps theoretical response	Prevents ESD damage to CMOS inputs (e.g., microcontroller GPIO, USB PHY) before latch-up occurs.
RoHS-compliant "e3" suffix	Meets EU Directive 2011/65/EU with matte-tin plating; eliminates lead-based solder compatibility concerns.
Moisture sensitivity Level 1	Eliminates dry-pack requirement and bake-out prior to reflow; reduces manufacturing cost and process risk.
DO-214AC footprint	Ensures drop-in compatibility with existing SMA layout standards and pick-and-place tooling across OEMs.

Applications

Industrial Power Input Protection	Automotive Body Control Module
Use Scenario: 24 V DC input rail in programmable logic controllers exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input and ground to clamp transients before DC-DC converter input stage. Use Value: Limits voltage to ≤13.3 V during 37.8 A surge, preventing overvoltage failure of 36 V-rated input capacitors and controller ICs.	Use Scenario: LIN bus line protection in door module electronics subjected to ESD and battery reversal events. IC Role / Device Role / Timing Role: Series-connected TVS on LIN TX/RX line referenced to chassis ground to suppress ±8 kV contact ESD per IEC61000-4-2. Use Value: Sub-100 ps response prevents data corruption during fast transients; 7.0 V V_WM avoids interference with 12 V supply monitoring.
Telecom Ethernet Port Protection	Medical Sensor Interface
Use Scenario: Secondary protection on PoE-powered Ethernet PHY interface after primary gas discharge tube (GDT). IC Role / Device Role / Timing Role: Final-stage TVS on MDI pair to clamp residual surges from IEC61000-4-5 42 Ω coupling to ≤13.3 V. Use Value: 500 W rating handles coupled lightning energy without degradation; low capacitance preserves 100BASE-TX signal integrity.	Use Scenario: Analog front-end protection for patient-connected ECG electrodes exposed to defibrillation pulses. IC Role / Device Role / Timing Role: Low-leakage TVS on instrumentation amplifier inputs to limit fault voltage while maintaining <200 µA bias current. Use Value: 200 µA max I_D avoids offset drift in high-gain amplifiers; 150 °C max T_J supports sterilization cycle thermal profiles.

Industrial Power Input Protection

Automotive Body Control Module

Use Scenario: 24 V DC input rail in programmable logic controllers exposed to load dump and ISO 7637-2 pulses.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between input and ground to clamp transients before DC-DC converter input stage.

Use Value: Limits voltage to ≤13.3 V during 37.8 A surge, preventing overvoltage failure of 36 V-rated input capacitors and controller ICs.

Use Scenario: LIN bus line protection in door module electronics subjected to ESD and battery reversal events.

IC Role / Device Role / Timing Role: Series-connected TVS on LIN TX/RX line referenced to chassis ground to suppress ±8 kV contact ESD per IEC61000-4-2.

Use Value: Sub-100 ps response prevents data corruption during fast transients; 7.0 V V_WM avoids interference with 12 V supply monitoring.

Telecom Ethernet Port Protection

Medical Sensor Interface

Use Scenario: Secondary protection on PoE-powered Ethernet PHY interface after primary gas discharge tube (GDT).

IC Role / Device Role / Timing Role: Final-stage TVS on MDI pair to clamp residual surges from IEC61000-4-5 42 Ω coupling to ≤13.3 V.

Use Value: 500 W rating handles coupled lightning energy without degradation; low capacitance preserves 100BASE-TX signal integrity.

Use Scenario: Analog front-end protection for patient-connected ECG electrodes exposed to defibrillation pulses.

IC Role / Device Role / Timing Role: Low-leakage TVS on instrumentation amplifier inputs to limit fault voltage while maintaining <200 µA bias current.

Use Value: 200 µA max I_D avoids offset drift in high-gain amplifiers; 150 °C max T_J supports sterilization cycle thermal profiles.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ7.0A	Same V_WM, V_BR, V_C, and P_PP; non-RoHS tin-lead plating; no "e3" suffix.	Lacks RoHS compliance; unsuitable for EU medical or consumer shipments requiring lead-free certification.	Select SMAJ7.0A only for legacy industrial designs where tin-lead solder is retained and regulatory compliance permits.
SMBJ7.0A	Same electrical specs but in DO-214AA (SMB) package; 1.5× larger thermal resistance (25 °C/W vs. 15 °C/W).	Lower power derating on same PCB area; requires larger copper pour to sustain 500 W pulse.	Choose SMBJ7.0A only if board space allows larger footprint and thermal management is enhanced via added copper.

Compared with SMAJ7.0A and SMBJ7.0A, SMAJ7.0E3/TR13 uniquely combines RoHS compliance, optimal DO-214AC thermal performance, and tape-and-reel packaging for high-volume SMT - making it the preferred choice for new automotive and medical designs requiring traceable, compliant components.

Availability

SMAJ7.0E3/TR13 is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, telecom Ethernet port protection, and medical sensor interface applications requiring stable component supply across long production lifecycles.

Supply support for SMAJ7.0E3/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, RF solutions, and discrete protection devices for aerospace, defense, and industrial markets.

The SMAJ series was engineered specifically for surface-mount transient suppression in harsh environments - delivering 500 W surge capability in compact DO-214AC packages with validated performance across –65 °C to +150 °C.

FAQ

What is the clamping voltage of SMAJ7.0E3/TR13 at its rated peak pulse current?

The SMAJ7.0E3/TR13 has a maximum clamping voltage (V_C) of 13.3 V when subjected to its rated 37.8 A peak pulse current (10/1000 µs waveform). This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.

Is SMAJ7.0E3/TR13 RoHS compliant and what does the "e3" suffix indicate?

Yes, SMAJ7.0E3/TR13 is RoHS compliant. The "e3" suffix explicitly denotes RoHS-compliant construction with annealed matte-tin plating on the leads, meeting EU Directive 2011/65/EU requirements. This eliminates lead content in the termination finish and ensures compatibility with lead-free reflow soldering processes used in modern electronics manufacturing.

Can SMAJ7.0E3/TR13 be used for bidirectional transient protection?

No, SMAJ7.0E3/TR13 is a unidirectional TVS diode. Its cathode-band marking and electrical specifications (e.g., forward surge rating of 40 A) confirm asymmetric operation. For bidirectional protection, Microsemi offers variants with "CA" suffix (e.g., SMAJ7.0CA), which provide symmetrical clamping in both polarities and omit the cathode band.

What is the maximum steady-state power dissipation of SMAJ7.0E3/TR13 on a standard FR4 PCB?

When mounted on an FR4 printed circuit board with 1 oz copper and Microsemi's recommended footprint, SMAJ7.0E3/TR13 dissipates up to 5 W continuously at a lead temperature (T_L) of 75 °C. At ambient temperature (T_A) of 25 °C, its steady-state power rating drops to 1.56 W due to higher thermal resistance to ambient (80 °C/W).

Does SMAJ7.0E3/TR13 meet IEC61000-4-5 for secondary lightning protection?

Yes, SMAJ7.0E3/TR13 is certified for secondary lightning protection per IEC61000-4-5. With a 42 Ω source impedance, it supports Class 4 (up to 12 V systems); with a 12 Ω source, it qualifies for Class 2. Its 500 W peak pulse rating and 13.3 V clamping voltage ensure compliance when applied with appropriate series impedance in the protected circuit.

SMAJ7.0E3/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):: 7V

Voltage - Breakdown (Min):: 7.78V

Voltage - Clamping (Max) @ Ipp:: 13.3V

Current - Peak Pulse (10/1000µs):: 37.8A

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)

SMAJ7.0E3/TR13 FAQ

1.How can I place an order for SMAJ7.0E3/TR13 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ7.0E3/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 SMAJ7.0E3/TR13 reliable?

The price and inventory of SMAJ7.0E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.0E3/TR13 is usually 5 days.

3.What payment methods are accepted for SMAJ7.0E3/TR13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0E3/TR13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ7.0E3/TR13?

SMAJ7.0E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ7.0E3/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 SMAJ7.0E3/TR13?

For technical support, including SMAJ7.0E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0E3/TR13 requirements.

6.How does Aetrix verify that SMAJ7.0E3/TR13 is sourced from the original manufacturer or authorized distributors?

All SMAJ7.0E3/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 SMAJ7.0E3/TR13 meets industry standards.

7.What is the process for return or replacement of SMAJ7.0E3/TR13?

All SMAJ7.0E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0E3/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 SMAJ7.0E3/TR13 part is unused and in its original packaging.

Return procedure for SMAJ7.0E3/TR13:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…