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

Taiwan Semiconductor Corporation SMAJ130

Name: SMAJ130
Brand: Taiwan Semiconductor Corporation
SKU: SMAJ130
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMAJ130

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ130.pdf

Description:: 300W, 160V, 10%, UNIDIRECTIONAL,

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SMAJ130 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 130 V working stand-off voltage (V_WM), 144–176 V breakdown voltage (V_BR @ 1 mA), 231 V maximum clamping voltage (V_C) at 1.3 A peak impulse current, and 400 W peak pulse power rating (10/1000 µs waveform). It is used in on-board DC/DC converters to safeguard switching controllers and MOSFET gate drivers against ESD and load dump transients.

For engineers reviewing the SMAJ130 datasheet, SMAJ130 pinout, SMAJ130 application, or SMAJ130 equivalent, key selection considerations include its DO-214AC (SMA) package compatibility with automated placement, sub-1 ps response time, <1 µA reverse leakage at V_WM, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and junction temperature range of –55°C to +150°C.

Technical Context

The SMAJ130 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified V_BR range (144–176 V), then clamping transient energy to ≤231 V at 1.3 A. Its glass-passivated junction ensures stable breakdown characteristics and low leakage under steady-state bias.

It is rated for 400 W peak pulse power (10/1000 µs), derated linearly above 25°C ambient per Fig.2, and supports 40 A non-repetitive forward surge (8.3 ms half-sine). Polarity is marked by cathode band; no internal series resistance or integrated capacitance tuning is present.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	130 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin.
V_BR @ I_T = 1 mA	144–176 V - Measured breakdown threshold; ensures reliable turn-on during transients without premature leakage.
V_C @ I_PPM = 1.3 A	231 V - Clamped voltage under 10/1000 µs surge; determines protected circuit's maximum stress level.
P_PPM	400 W - Peak pulse power handling (10/1000 µs); enables suppression of automotive load dump and inductive switch-off spikes.
I_R @ V_WM	<1 µA - Reverse leakage at stand-off voltage; minimizes quiescent power loss and avoids false triggering.
Package	DO-214AC (SMA) - Industry-standard surface-mount outline; compatible with IPC-7351B footprint and reflow profiles.

Pinout & Package

DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.060 g. Complies with UL 94V-0, JESD201 Class 2 whisker resistance, and J-STD-020 moisture sensitivity Level 1.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current input / Cathode-referenced node	Connected to protected line (e.g., DC bus); conducts during forward surge or bidirectional variants (not applicable here).
Cathode	Clamping reference / Ground return path	Connected to system ground or low-impedance return; establishes clamping reference and carries full transient current.

Key Features

Feature	Design Value
Fast response time	<1.0 ps - Enables clamping before sensitive ICs experience overvoltage damage during ESD or fast transients.
Glass passivated junction	Stable V_BR tolerance and low IR drift across temperature and lifetime - critical for long-term reliability in industrial environments.
ISO 7637-2 compliance	Validated for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - meets automotive electronics immunity requirements.
Automated placement compatibility	DO-214AC geometry and lead coplanarity per J-STD-002 - supports high-yield SMT assembly without manual rework.

Applications

Switching Mode Power Supply (SMPS)	On-board DC/DC Converter
Use Scenario: Protection of primary-side MOSFETs and controller ICs against transformer leakage inductance spikes and input line surges. IC Role / Device Role: Unidirectional TVS placed between drain and source (or drain and ground) to clamp voltage overshoot during turn-off. Use Value: Limits V_DS stress to ≤231 V, preventing avalanche failure and enabling use of lower-voltage-rated MOSFETs.	Use Scenario: Safeguarding buck converter ICs and gate drivers in automotive body control modules exposed to battery transients. IC Role / Device Role: TVS connected across input capacitor to absorb load dump (ISO 7637-2 Pulse 5a) and jump-start surges. Use Value: Withstands 400 W pulses while maintaining <1 µA leakage, ensuring no impact on standby current or regulation accuracy.
Lighting Application	Adapters
Use Scenario: Overvoltage protection in LED driver front-end circuits subjected to lightning-induced surges on AC mains input. IC Role / Device Role: Secondary-side TVS across output terminals to protect constant-current ICs and feedback networks. Use Value: Clamps 10/1000 µs transients to 231 V, preserving LED string integrity and avoiding false dimming or shutdown.	Use Scenario: Input-stage protection in universal-input AC/DC adapters for consumer electronics. IC Role / Device Role: Unidirectional TVS placed after bridge rectifier to suppress differential-mode surges on bulk capacitor. Use Value: 130 V V_WM allows operation up to 115 V_RMS × √2 ≈ 163 V peak, providing 33 V safety margin before clamping.

Switching Mode Power Supply (SMPS)

On-board DC/DC Converter

Use Scenario: Protection of primary-side MOSFETs and controller ICs against transformer leakage inductance spikes and input line surges.

IC Role / Device Role: Unidirectional TVS placed between drain and source (or drain and ground) to clamp voltage overshoot during turn-off.

Use Value: Limits V_DS stress to ≤231 V, preventing avalanche failure and enabling use of lower-voltage-rated MOSFETs.

Use Scenario: Safeguarding buck converter ICs and gate drivers in automotive body control modules exposed to battery transients.

IC Role / Device Role: TVS connected across input capacitor to absorb load dump (ISO 7637-2 Pulse 5a) and jump-start surges.

Use Value: Withstands 400 W pulses while maintaining <1 µA leakage, ensuring no impact on standby current or regulation accuracy.

Lighting Application

Adapters

Use Scenario: Overvoltage protection in LED driver front-end circuits subjected to lightning-induced surges on AC mains input.

IC Role / Device Role: Secondary-side TVS across output terminals to protect constant-current ICs and feedback networks.

Use Value: Clamps 10/1000 µs transients to 231 V, preserving LED string integrity and avoiding false dimming or shutdown.

Use Scenario: Input-stage protection in universal-input AC/DC adapters for consumer electronics.

IC Role / Device Role: Unidirectional TVS placed after bridge rectifier to suppress differential-mode surges on bulk capacitor.

Use Value: 130 V V_WM allows operation up to 115 V_RMS × √2 ≈ 163 V peak, providing 33 V safety margin before clamping.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ130A	Narrower V_BR range (144–159 V) and lower clamping voltage (209 V @ 1.5 A); tighter tolerance improves consistency in precision-clamp designs.	Better suited for systems requiring tighter clamping voltage control and reduced V_C margin, e.g., 12 V rail protection with strict voltage ceilings.	Select SMAJ130A when clamping voltage headroom is constrained and tighter V_BR distribution is required.
SMBJ130	Same electrical specs but in DO-214AA (SMB) package - larger footprint (4.58 mm × 3.94 mm vs. SMA's 4.29 mm × 2.79 mm) and higher thermal mass.	Preferred where board space permits and higher steady-state power dissipation (1.5 W vs. 1 W) is needed for repetitive surge duty cycles.	Choose SMBJ130 if layout allows larger package and thermal performance under repeated transients is prioritized over size.

Compared with SMAJ130A, the SMAJ130 offers wider V_BR tolerance and higher clamping voltage, making it more tolerant of manufacturing variation but less precise in low-margin designs; compared with SMBJ130, it saves PCB area and suits compact layouts but has lower steady-state power rating and thermal capacity.

Availability

SMAJ130 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, RoHS-compliant packaging, and ISO 7637-2 validated surge immunity.

Supply support for SMAJ130 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q200 qualified product lines.

The SMAJ series was developed for high-reliability, surface-mount transient suppression in automotive, industrial, and consumer power systems - emphasizing fast response, low leakage, and standardized DO-214AC packaging.

FAQ

What is the maximum clamping voltage of the SMAJ130 under standard test conditions?

The SMAJ130 has a maximum clamping voltage (V_C) of 231 V when subjected to a 10/1000 µs waveform with a peak impulse current (I_PPM) of 1.3 A. This value is measured per JEDEC standards and reflects worst-case voltage seen by downstream circuitry during surge events. The SMAJ130 maintains this clamping performance across its full operating temperature range (–55°C to +150°C), with derating applied only to peak power, not V_C.

Is the SMAJ130 suitable for bidirectional transient protection?

No, the SMAJ130 is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical specifications - including V_BR, V_WM, and V_C - apply only in the reverse direction. For bidirectional protection, the SMAJ130CA variant (with "CA" suffix) must be used; it provides symmetrical clamping in both polarities and is explicitly characterized for dual-directional applications per the datasheet.

What does the marking code "SH" indicate on the SMAJ130 device?

The marking code "SH" on the SMAJ130 identifies the specific voltage variant within the SMAJ family and confirms compliance with the stated electrical parameters: V_WM = 130 V, V_BR = 144–176 V, and V_C = 231 V. This two-character laser mark appears adjacent to the cathode band on the DO-214AC package and is used for traceability and quick visual verification during assembly and inspection.

How does the SMAJ130 meet automotive EMC requirements?

The SMAJ130 meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) requirements as verified in TSC's characterization testing. Its 400 W peak pulse rating, sub-1 ps response, and stable clamping behavior ensure robust immunity against conducted transients common in 12 V and 24 V vehicle electrical systems - making it suitable for ECUs, lighting modules, and infotainment power inputs.

What is the steady-state power dissipation rating for the SMAJ130?

The SMAJ130 has a steady-state power dissipation (P_D) rating of 1 W at 25°C ambient temperature. This value applies to continuous DC or low-frequency reverse-bias conditions and is derated linearly above 25°C per the thermal derating curve in Figure 2 of the datasheet. At 100°C ambient, P_D drops to approximately 0.5 W, limiting its use in sustained overvoltage scenarios without active cooling or derating margins.

SMAJ130 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):: 130V

Voltage - Breakdown (Min):: 144V

Voltage - Clamping (Max) @ Ipp:: 231V

Current - Peak Pulse (10/1000µs):: 1.3A

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)

SMAJ130 FAQ

1.How can I place an order for SMAJ130 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ130 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 SMAJ130 reliable?

The price and inventory of SMAJ130 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ130 is usually 5 days.

3.What payment methods are accepted for SMAJ130?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ130 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ130?

SMAJ130 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ130 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 SMAJ130?

For technical support, including SMAJ130 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ130 requirements.

6.How does Aetrix verify that SMAJ130 is sourced from the original manufacturer or authorized distributors?

All SMAJ130 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 SMAJ130 meets industry standards.

7.What is the process for return or replacement of SMAJ130?

All SMAJ130 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ130, 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 SMAJ130 part is unused and in its original packaging.

Return procedure for SMAJ130:

1.Submit a request within 90 days.

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

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