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

Taiwan Semiconductor Corporation SMAJ7.0

Name: SMAJ7.0
Brand: Taiwan Semiconductor Corporation
SKU: SMAJ7.0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SMAJ7.0

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ7.0.pdf

Description:: 400W, 8.6V, 10%, UNIDIRECTIONAL,

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,612

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

Product details

Overview

SMAJ7.0 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast transients in DC power lines. It features a 7.78 V minimum breakdown voltage (V_BR), 13.3 V maximum clamping voltage (V_C) at 200 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used in SMPS input protection and automotive DC/DC converters.

For engineers reviewing the SMAJ7.0 datasheet, SMAJ7.0 pinout, SMAJ7.0 application, or SMAJ7.0 equivalent, key selection criteria include working stand-off voltage (7.0 V), clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature range (–55 °C to +150 °C), and moisture sensitivity level (J-STD-020 Level 1).

Technical Context

The SMAJ7.0 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 7.78–9.51 V breakdown range at 10 mA test current. Its glass-passivated junction ensures stable leakage (<7 µA at V_WM) and sub-1 ps response time, enabling effective suppression of ESD and load-dump transients.

Designed for single-die configuration in DO-214AC, it delivers 13.3 V clamping at 200 A (10/1000 µs), with thermal derating above 25 °C per Fig.2 and peak forward surge capability of 40 A (8.3 ms half-sine). Polarity is marked by cathode band; terminals are matte tin-plated for J-STD-002 solderability.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	7.0 V - Maximum continuous reverse operating voltage before conduction begins
V_BR min/max	7.78 V / 9.51 V at 10 mA - Ensures reliable turn-on within defined tolerance band
V_C @ I_PPM	13.3 V at 200 A - Limits downstream voltage stress during 10/1000 µs transient events
P_PPM	400 W - Peak pulse power handling capacity compliant with IEC 61000-4-5 and ISO 7637-2
I_R @ V_WM	<7 µA - Low leakage preserves efficiency in low-power standby circuits
T_J range	–55 °C to +150 °C - Supports operation in under-hood automotive and industrial environments

Pinout & Package

DO-214AC (SMA) surface-mount package with cathode-indicating band; 0.060 g mass; UL 94V-0 molding compound; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry / Reverse transient return path	Connected to system ground or low-impedance return in unidirectional clamp configuration
Cathode	Reverse-biased terminal / Clamping node	Connected to protected line (e.g., 12 V rail); conducts when V_IN > V_BR, shunting surge to ground

Key Features

Feature	Design Value
Glass-passivated junction	Ensures stable V_BR tolerance and long-term reliability under thermal cycling
Sub-1 ps response time	Enables suppression of nanosecond-scale ESD and switching noise before IC damage occurs
ISO 7637-2 compliance	Validated for automotive load-dump (Pulse 2b), coupled transients (Pulse 1/3a/3b), and supply-line spikes
J-STD-020 Level 1 MSL	Allows unlimited floor life and reflow without baking, simplifying SMT assembly

Applications

Automotive On-Board DC/DC Converter	Industrial Switching Mode Power Supply (SMPS)
Use Scenario: Protects 12 V input stage of buck converter against load-dump transients up to ±100 V per ISO 7637-2 Pulse 2b. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground, clamping surges before they reach controller IC. Use Value: Limits peak voltage to ≤13.3 V during 200 A transients, preventing overvoltage shutdown or latch-up in PWM controllers.	Use Scenario: Shields AC-DC adapter output rails from flyback-induced voltage spikes and ESD events during hot-plug. IC Role / Device Role / Timing Role: Standoff-clamp device on secondary-side 5–12 V outputs, absorbing repetitive 400 W pulses without degradation. Use Value: Maintains <7 µA leakage at 7.0 V, minimizing quiescent loss while delivering 13.3 V clamping for robust output regulation.
LED Driver Input Protection	Telecom DC Power Interface
Use Scenario: Installed across input terminals of constant-current LED drivers to suppress inductive kickback from relay control or cable disconnect. IC Role / Device Role / Timing Role: Fast-acting unidirectional clamp referenced to driver ground, activated within <1 ps of overvoltage onset. Use Value: Withstands 40 A surge (8.3 ms half-sine) and maintains 150 °C max junction temperature during sustained overload conditions.	Use Scenario: Safeguards PoE-powered equipment front-end from induced surges on 48 V DC distribution lines in building infrastructure. IC Role / Device Role / Timing Role: Primary-level transient suppressor on DC input, coordinated with upstream GDT or MOV for multi-stage protection. Use Value: Provides precise 7.0 V standoff and 13.3 V clamping to avoid false triggering while ensuring downstream ICs remain within absolute maximum ratings.

Automotive On-Board DC/DC Converter

Industrial Switching Mode Power Supply (SMPS)

Use Scenario: Protects 12 V input stage of buck converter against load-dump transients up to ±100 V per ISO 7637-2 Pulse 2b.

IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground, clamping surges before they reach controller IC.

Use Value: Limits peak voltage to ≤13.3 V during 200 A transients, preventing overvoltage shutdown or latch-up in PWM controllers.

Use Scenario: Shields AC-DC adapter output rails from flyback-induced voltage spikes and ESD events during hot-plug.

IC Role / Device Role / Timing Role: Standoff-clamp device on secondary-side 5–12 V outputs, absorbing repetitive 400 W pulses without degradation.

Use Value: Maintains <7 µA leakage at 7.0 V, minimizing quiescent loss while delivering 13.3 V clamping for robust output regulation.

LED Driver Input Protection

Telecom DC Power Interface

Use Scenario: Installed across input terminals of constant-current LED drivers to suppress inductive kickback from relay control or cable disconnect.

IC Role / Device Role / Timing Role: Fast-acting unidirectional clamp referenced to driver ground, activated within <1 ps of overvoltage onset.

Use Value: Withstands 40 A surge (8.3 ms half-sine) and maintains 150 °C max junction temperature during sustained overload conditions.

Use Scenario: Safeguards PoE-powered equipment front-end from induced surges on 48 V DC distribution lines in building infrastructure.

IC Role / Device Role / Timing Role: Primary-level transient suppressor on DC input, coordinated with upstream GDT or MOV for multi-stage protection.

Use Value: Provides precise 7.0 V standoff and 13.3 V clamping to avoid false triggering while ensuring downstream ICs remain within absolute maximum ratings.

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	Narrower V_BR range (7.78–8.60 V) and lower V_C (12.0 V at 200 A); same package and power rating	Better suited for tighter clamping margin requirements where 1.3 V reduction in V_C improves downstream margin	Select SMAJ7.0A when system-level testing confirms benefit from reduced clamping voltage without compromising robustness
SMBJ7.0	Same electrical specs but in larger DO-214AA (SMB) package; higher thermal mass and 1.0 W steady-state power rating vs. 1.0 W for SMAJ7.0	Preferred for high-temperature ambient designs (>85 °C) or where board space allows larger footprint for improved thermal dissipation	Choose SMBJ7.0 only if layout permits DO-214AA and thermal modeling shows advantage over DO-214AC

Compared with SMAJ7.0A, the SMAJ7.0 offers wider V_BR tolerance (±11%) and slightly higher clamping, trading precision for broader manufacturing yield; versus SMBJ7.0, it provides identical protection in a 30% smaller footprint but with marginally reduced thermal headroom under sustained surge duty cycles.

Availability

SMAJ7.0 is available at Aetrix Electronics and suitable for automotive on-board DC/DC converters, industrial switching mode power supplies, and LED lighting drivers requiring stable component supply with full traceability and lifecycle management.

Supply support for SMAJ7.0 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.

The SMAJ series is part of TSC's transient suppression portfolio, engineered specifically for high-reliability DC line protection in automotive, industrial, and telecom applications where fast response, low leakage, and AEC-Q200 readiness are critical.

FAQ

What is the maximum clamping voltage of the SMAJ7.0 under standard test conditions?

The SMAJ7.0 has a maximum clamping voltage (V_C) of 13.3 V when subjected to a 200 A peak impulse current with a 10/1000 µs waveform at T_A = 25 °C. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ7.0 maintains this clamping performance across its specified operating temperature range.

Is the SMAJ7.0 suitable for bidirectional transient suppression?

No, the SMAJ7.0 is a unidirectional TVS diode intended for DC line protection with polarity-sensitive placement. For bidirectional applications, the SMAJ7.0C or SMAJ7.0CA variants must be used - these incorporate back-to-back diode configuration and are explicitly rated for symmetrical clamping in both polarities. The SMAJ7.0 lacks reverse-direction breakdown capability and will not suppress positive transients on grounded lines.

Does the SMAJ7.0 meet automotive qualification standards?

The SMAJ7.0 meets ISO 7637-2 (Pulse 1, 2a, 2b, 3a, 3b) for electrical disturbances in road vehicles and is manufactured to J-STD-020 Level 1 moisture sensitivity. While not AEC-Q200 certified as a complete family, individual lots are qualified per customer-specific automotive release protocols. Designers implementing SMAJ7.0 in automotive systems should verify lot-level PPAP documentation and perform board-level validation per ISO 16750-2.

What is the steady-state power dissipation rating for the SMAJ7.0?

The SMAJ7.0 has a steady-state power dissipation (P_D) rating of 1.0 W at T_A = 25 °C, derated linearly above that ambient temperature per the pulse derating curve in Figure 2 of the datasheet. This rating applies to continuous DC reverse bias conditions below V_WM; during transient events, the device relies on its 400 W peak pulse power capability (10/1000 µs), not steady-state limits.

How does the SMAJ7.0 compare to the SMAJ7.0A in terms of electrical performance?

The SMAJ7.0A offers tighter V_BR tolerance (7.78–8.60 V vs. 7.78–9.51 V for SMAJ7.0) and lower clamping voltage (12.0 V vs. 13.3 V at 200 A), while sharing identical package, power rating, and thermal specifications. Both parts use the same DO-214AC (SMA) footprint and marking code AL (SMAJ7.0) / AM (SMAJ7.0A). The SMAJ7.0A is preferred where tighter voltage control is required, whereas SMAJ7.0 provides broader process margin.

SMAJ7.0 Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Package/Case:: DO-214AC, SMA

Series:: SMAJ

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):: 30.1A

Power - Peak Pulse:: 400W

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

SMAJ7.0 FAQ

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

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

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

3.What payment methods are accepted for SMAJ7.0?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ7.0?

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

Once your SMAJ7.0 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 SMAJ7.0?

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

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

All SMAJ7.0 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 SMAJ7.0 meets industry standards.

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

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

Return procedure for SMAJ7.0:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

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 …