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

Taiwan Semiconductor Corporation SMAJ60C

Name: SMAJ60C
Brand: Taiwan Semiconductor Corporation
SKU: SMAJ60C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMAJ60C

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ60C.pdf

Description:: 400W, 74.1V, 10%, BIDIRECTIONAL,

Quantity:: RFQ Add To RFQ list

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Inventory:5,021

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Product details

Overview

SMAJ60C from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 60V working stand-off voltage (V_WM), 66.7–81.5V breakdown voltage (V_BR @ 1mA), and clamps transients to ≤107V at 3.7A peak impulse current (10/1000μs waveform), making it suitable for automotive load-dump and industrial SMPS input-stage protection.

For engineers reviewing the SMAJ60C datasheet, SMAJ60C pinout, SMAJ60C application, or SMAJ60C equivalent, key selection criteria include its unidirectional polarity, 150°C junction temperature rating, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and DO-214AC mechanical compatibility with automated SMT placement-critical for high-reliability 12V/24V board-level surge suppression.

Technical Context

The SMAJ60C operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable clamping and low leakage (<1μA @ 60V). Its fast response time (<1.0ps from 0V to V_BR) ensures protection against ESD and fast-rising transients before downstream ICs are damaged.

It delivers 400W peak pulse power (10/1000μs) at 25°C, derated linearly above ambient temperature per Fig.2, and supports steady-state dissipation up to 1W. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for safety-critical PCB mounting.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	60 V - Maximum continuous reverse operating voltage before clamping begins; sets safe DC rail margin for 12V/24V systems.
V_BR @ I_T=1mA	66.7–81.5 V - Breakdown threshold range defining turn-on consistency across production lots.
V_C @ I_PPM=3.7A	≤107 V - Clamped voltage during 10/1000μs surge; determines maximum stress on protected ICs.
P_PPM	400 W - Peak pulse power handling capability; enables survivability of automotive load-dump pulses.
I_R @ V_WM	<1 μA - Reverse leakage at rated stand-off; ensures minimal standby power loss in battery-powered systems.
T_J max	150 °C - Maximum junction temperature; supports operation in under-hood or enclosed industrial enclosures.
Package	DO-214AC (SMA) - Standard surface-mount outline with cathode band marking; compatible with IPC-7351B land patterns.

Pinout & Package

DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈0.060g. Complies with J-STD-002 solderability and JESD201 Class 2 whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential side (e.g., GND or return path); conducts during forward surge events.
Cathode	Reverse-biased clamping terminal	Connected to protected line (e.g., +12V rail); avalanches into conduction when V_in exceeds V_BR.

Key Features

Feature	Design Value
Glass-passivated junction	Ensures stable V_BR tolerance and long-term reliability under thermal cycling and humidity exposure.
Fast response time <1.0ps	Clamps ESD and lightning-induced transients before propagation to sensitive analog or digital circuitry.
ISO 7637-2 compliance	Validated for automotive electrical system immunity testing (Pulse 1, 2a, 2b, 3a, 3b), enabling direct use in vehicle ECUs.
Moisture sensitivity level 1	Zero bake requirement prior to reflow; simplifies manufacturing and reduces process risk.
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and EU RoHS directives for environmentally restricted substances.

Applications

Automotive Body Control Module (BCM)	Industrial DC/DC Converter Input Stage
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O from load-dump spikes during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS placed between V_BAT and GND upstream of LDO regulators. Use Value: Limits transient voltage to ≤107V, preventing latch-up or gate oxide damage in 3.3V/5V logic devices.	Use Scenario: Safeguarding primary-side MOSFET gates and controller ICs in isolated flyback converters powered from 24V industrial rails. IC Role / Device Role / Timing Role: Standoff clamp on input bulk capacitor node, absorbing switching noise and line surges. Use Value: Maintains V_WM = 60V margin above nominal 24V, ensuring no false triggering during normal operation.
LED Driver Power Supply	Telecom Power Entry Protection
Use Scenario: Suppressing inductive kickback from relay coils and MOSFET switches driving high-brightness LED strings. IC Role / Device Role / Timing Role: Parallel-connected TVS across relay coil or switch drain-source terminals. Use Value: Absorbs 400W peak energy without degradation, extending driver lifetime in outdoor lighting applications.	Use Scenario: Front-end protection for AC/DC adapters used in telecom base station power supplies exposed to lightning-induced surges. IC Role / Device Role / Timing Role: First-line clamping device on secondary-side DC output before DC-DC modules. Use Value: Withstands repeated 10/1000μs surges per IEC 61000-4-5 Level 4, reducing field failure rates.

Automotive Body Control Module (BCM)

Industrial DC/DC Converter Input Stage

Use Scenario: Protecting LIN bus transceivers and microcontroller I/O from load-dump spikes during alternator regulation faults.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between V_BAT and GND upstream of LDO regulators.

Use Value: Limits transient voltage to ≤107V, preventing latch-up or gate oxide damage in 3.3V/5V logic devices.

Use Scenario: Safeguarding primary-side MOSFET gates and controller ICs in isolated flyback converters powered from 24V industrial rails.

IC Role / Device Role / Timing Role: Standoff clamp on input bulk capacitor node, absorbing switching noise and line surges.

Use Value: Maintains V_WM = 60V margin above nominal 24V, ensuring no false triggering during normal operation.

LED Driver Power Supply

Telecom Power Entry Protection

Use Scenario: Suppressing inductive kickback from relay coils and MOSFET switches driving high-brightness LED strings.

IC Role / Device Role / Timing Role: Parallel-connected TVS across relay coil or switch drain-source terminals.

Use Value: Absorbs 400W peak energy without degradation, extending driver lifetime in outdoor lighting applications.

Use Scenario: Front-end protection for AC/DC adapters used in telecom base station power supplies exposed to lightning-induced surges.

IC Role / Device Role / Timing Role: First-line clamping device on secondary-side DC output before DC-DC modules.

Use Value: Withstands repeated 10/1000μs surges per IEC 61000-4-5 Level 4, reducing field failure rates.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ60A	Narrower V_BR range (66.7–73.7V vs. 66.7–81.5V); tighter 5% tolerance.	Better suited for precision-clamp designs where consistent turn-on is critical.	Select SMAJ60A when V_BR consistency across temperature and lot is prioritized over cost.
SMBJ60C	Same V_WM/V_BR specs but in larger DO-214AA (SMB) package; 600W P_PPM.	Higher power handling allows longer surge duration or higher repetition rates.	Choose SMBJ60C only if board space permits and >400W pulse energy is required.

Compared with SMAJ60A and SMBJ60C, the SMAJ60C offers optimal balance of cost, footprint, and 400W surge capacity for standard 12V/24V automotive and industrial DC rails-without requiring PCB redesign or sacrificing ISO 7637-2 compliance.

Availability

SMAJ60C is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converter inputs, LED driver protection, and telecom power entry circuits requiring stable component supply and full traceability.

Supply support for SMAJ60C 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 for industrial, automotive, and consumer markets.

The SMAJ series was developed specifically for surface-mount transient suppression in harsh environments-emphasizing high surge robustness, tight parametric control, and AEC-Q200 readiness for automotive-grade reliability.

FAQ

What is the polarity configuration of the SMAJ60C?

The SMAJ60C is a unidirectional TVS diode, with cathode marked by a band on the DO-214AC package. It conducts in forward bias like a standard diode and clamps in reverse bias when voltage exceeds V_BR. This configuration is ideal for protecting DC lines referenced to ground, such as automotive 12V battery feeds. The SMAJ60C must be oriented with cathode toward the protected line and anode to ground.

Does the SMAJ60C meet automotive qualification standards?

While not AEC-Q200 certified out-of-box, the SMAJ60C meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements-key for automotive electronic module immunity validation. Its glass-passivated junction, 150°C T_J rating, and moisture sensitivity level 1 support automotive-grade assembly and operation. Customers should perform full AEC-Q200 stress testing if formal qualification is required for the SMAJ60C.

What is the maximum clamping voltage of the SMAJ60C under surge conditions?

The SMAJ60C clamps to a maximum of 107V when subjected to its rated 3.7A peak impulse current (I_PPM) using the standardized 10/1000μs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on downstream components during transient events. The SMAJ60C's clamping performance remains stable due to its low dynamic impedance and controlled avalanche characteristics.

Can the SMAJ60C be used in bidirectional signal line protection?

No-the SMAJ60C is unidirectional and unsuitable for bidirectional AC or differential signal lines. For bidirectional protection, use the SMAJ60CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. The SMAJ60C's single-junction design and cathode-band marking confirm its unidirectional function; applying reverse polarity may cause permanent failure. Always verify polarity alignment in schematic and layout for the SMAJ60C.

What is the recommended PCB pad layout for the SMAJ60C?

Taiwan Semiconductor specifies a DO-214AC (SMA) pad layout optimized for thermal dissipation and solder joint reliability. Recommended dimensions: 2.5mm × 1.5mm pads with 1.5mm center-to-center spacing and 0.5mm solder mask opening. Thermal relief spokes are advised for the cathode pad to manage heat during reflow. The SMAJ60C's matte tin-plated leads comply with J-STD-002, supporting standard lead-free reflow profiles without voiding or dewetting.

SMAJ60C 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:: -

Bidirectional Channels:: 1

Voltage - Reverse Standoff (Typ):: 60V

Voltage - Breakdown (Min):: 66.7V

Voltage - Clamping (Max) @ Ipp:: 107V

Current - Peak Pulse (10/1000µs):: 3.7A

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)

SMAJ60C FAQ

1.How can I place an order for SMAJ60C through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ60C 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 SMAJ60C reliable?

The price and inventory of SMAJ60C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ60C is usually 5 days.

3.What payment methods are accepted for SMAJ60C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ60C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ60C?

SMAJ60C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ60C 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 SMAJ60C?

For technical support, including SMAJ60C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ60C requirements.

6.How does Aetrix verify that SMAJ60C is sourced from the original manufacturer or authorized distributors?

All SMAJ60C 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 SMAJ60C meets industry standards.

7.What is the process for return or replacement of SMAJ60C?

All SMAJ60C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ60C, 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 SMAJ60C part is unused and in its original packaging.

Return procedure for SMAJ60C:

1.Submit a request within 90 days.

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

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