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

Vishay General Semiconductor - Diodes Division SMAJ12C-E3/61

Name: SMAJ12C-E3/61
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMAJ12C-E3/61
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMAJ12C-E3/61

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ12C-E3/61.pdf

Description:: TVS DIODE 12VWM 22VC DO214AC

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Product details

Overview

SMAJ12C-E3/61 from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on signal or power lines. It features 12 V stand-off voltage (V_WM), 22.0 V maximum clamping voltage (V_C) at 18.2 A peak pulse current (I_PPM), 400 W peak pulse power (10/1000 µs), and operates from −55 °C to +150 °C - used in automotive sensor line protection and industrial I/O interface surge suppression.

For engineers reviewing the SMAJ12C-E3/61 datasheet, SMAJ12C-E3/61 pinout, SMAJ12C-E3/61 application, or SMAJ12C-E3/61 equivalent, key selection criteria include bi-directional clamping capability, low leakage (<1 µA at 12 V), RoHS-compliant matte tin terminations, MSL Level 1 rating, and compatibility with automated SMT placement on 5.0 × 5.0 mm copper pads.

Technical Context

This bi-directional TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ns) and low incremental surge resistance. Its symmetrical breakdown behavior ensures identical clamping in both polarities, with V_BR min/max of 13.3 V / 16.3 V at 1.0 mA test current.

The device is rated for 400 W peak pulse power (derated to 300 W above 78 V), supports 40 A non-repetitive forward surge (uni-directional only), and exhibits typical thermal resistance of 120 °C/W (junction-to-ambient) when mounted per recommended pad layout.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	12 V - maximum continuous reverse operating voltage before clamping initiates
V_C @ I_PPM	22.0 V - clamped voltage during 18.2 A 10/1000 µs surge, limiting downstream stress
I_PPM	18.2 A - peak surge current handled without failure under standard waveform
P_PPM	400 W - transient energy absorption capacity with 0.01% duty cycle
I_D @ V_WM	<1 µA - minimal leakage ensures negligible standby power loss in high-impedance circuits
T_J Range	−55 °C to +150 °C - enables deployment in under-hood automotive and industrial environments

Pinout & Package

DO-214AC (SMA) surface-mount package: molded epoxy case meeting UL 94 V-0, matte tin-plated leads solderable per J-STD-002, no polarity marking for bi-directional configuration.

Pin/Terminal	Circuit Role	Design Meaning
Anode/Cathode (symmetrical)	Bi-directional transient conduction path	No functional distinction - either terminal serves as input/output for bidirectional surge clamping

Key Features

Feature	Design Value
Bi-directional clamping	Enables single-device protection of AC-coupled or floating signal lines without polarity concerns
Glass-passivated junction	Ensures stable V_BR and low leakage over temperature and lifetime
MSL Level 1 rating	Allows unlimited floor life and reflow at 260 °C peak without preconditioning
RoHS-compliant E3 suffix	Meets JESD201 Class 1A whisker resistance for long-term reliability in commercial applications

Applications

Automotive Sensor Interfaces	Industrial Digital I/O Protection
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed directly at connector entry point to shunt transients before reaching sensitive IC inputs. Use Value: Limits induced voltage to ≤22.0 V during 18.2 A surges, preserving signal integrity and preventing latch-up in 3.3 V/5 V microcontrollers.	Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges and electrostatic discharge. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on 24 V DC input channels, coordinated with series impedance and filtering. Use Value: Withstands repeated 400 W transients while maintaining <1 µA leakage, ensuring stable logic thresholds and low false-trigger risk.
Consumer USB/Display Port Lines	Telecom Power Feeds
Use Scenario: ESD and lightning-induced surge protection on high-speed differential pairs in portable displays and docking stations. IC Role / Device Role / Timing Role: Low-capacitance bi-directional clamp (C_J ≈ 100–200 pF at V_WM) placed adjacent to connector to minimize stub length. Use Value: Clamps ±15 kV contact ESD per IEC 61000-4-2 without signal distortion, leveraging sub-ns response and symmetrical V_BR.	Use Scenario: Secondary surge suppression on -48 V telecom power distribution boards upstream of DC-DC converters. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing residual transients after primary gas discharge tube or MOV stages. Use Value: Delivers precise 12 V clamping window and 400 W pulse handling to protect isolated power controllers from repetitive line surges.

Automotive Sensor Interfaces

Industrial Digital I/O Protection

Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses.

IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed directly at connector entry point to shunt transients before reaching sensitive IC inputs.

Use Value: Limits induced voltage to ≤22.0 V during 18.2 A surges, preserving signal integrity and preventing latch-up in 3.3 V/5 V microcontrollers.

Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges and electrostatic discharge.

IC Role / Device Role / Timing Role: Primary front-end transient suppressor on 24 V DC input channels, coordinated with series impedance and filtering.

Use Value: Withstands repeated 400 W transients while maintaining <1 µA leakage, ensuring stable logic thresholds and low false-trigger risk.

Consumer USB/Display Port Lines

Telecom Power Feeds

Use Scenario: ESD and lightning-induced surge protection on high-speed differential pairs in portable displays and docking stations.

IC Role / Device Role / Timing Role: Low-capacitance bi-directional clamp (C_J ≈ 100–200 pF at V_WM) placed adjacent to connector to minimize stub length.

Use Value: Clamps ±15 kV contact ESD per IEC 61000-4-2 without signal distortion, leveraging sub-ns response and symmetrical V_BR.

Use Scenario: Secondary surge suppression on -48 V telecom power distribution boards upstream of DC-DC converters.

IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing residual transients after primary gas discharge tube or MOV stages.

Use Value: Delivers precise 12 V clamping window and 400 W pulse handling to protect isolated power controllers from repetitive line surges.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ12CA-E3/61	Identical electrical specs and packaging; CA suffix denotes same bi-directional construction as C	No functional difference - CA and C suffixes are interchangeable per Vishay documentation	Select based on distributor stock; both meet identical DO-214AC mechanical and RoHS requirements
SMCJ12C-E3/61	Same V_WM/V_C but higher P_PPM = 1500 W (10/1000 µs), larger DO-214AB (SMB) package	Better suited for higher-energy threats (e.g., IEC 61000-4-5 Level 4), requires larger PCB footprint	Choose SMAJ12C-E3/61 for space-constrained designs where 400 W suffices; upgrade to SMCJ12C-E3/61 only if system-level testing demands higher pulse rating

Compared with SMAJ12C-E3/61, SMAJ12CA-E3/61 offers identical protection performance in the same footprint, while SMCJ12C-E3/61 trades board area for 3.75× higher surge power handling - making the SMAJ12C-E3/61 optimal for cost- and size-sensitive consumer and automotive control units.

Availability

SMAJ12C-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, consumer USB/display port lines, and telecom power feeds requiring stable component supply across production lifecycles.

Supply support for SMAJ12C-E3/61 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

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.

The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where compact, high-reliability surge protection is critical.

FAQ

What is the clamping voltage of SMAJ12C-E3/61 under a standard 10/1000 µs surge?

The SMAJ12C-E3/61 clamps to a maximum of 22.0 V when subjected to its rated 18.2 A peak pulse current (I_PPM) under the 10/1000 µs waveform. This value is guaranteed across temperature and represents the upper limit of voltage seen by downstream circuitry during transient events - a critical parameter for ensuring compatibility with 24 V tolerant or 3.3 V/5 V logic interfaces protected by this device.

Is SMAJ12C-E3/61 unidirectional or bidirectional, and how does that affect circuit placement?

SMAJ12C-E3/61 is a bi-directional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity sensitivity. This allows direct placement across floating or AC-coupled lines - such as RS-485 buses or differential sensor outputs - without regard to anode/cathode orientation. No band marking is present, simplifying layout and eliminating risk of reverse installation.

What is the maximum reverse leakage current of SMAJ12C-E3/61 at its stand-off voltage?

At its 12 V stand-off voltage (V_WM), the SMAJ12C-E3/61 exhibits a maximum reverse leakage current (I_D) of 1.0 µA at 25 °C. This ultra-low leakage ensures minimal impact on high-impedance sensing nodes and battery-powered circuits, preserving signal accuracy and extending operational life in always-on monitoring systems using SMAJ12C-E3/61.

Does SMAJ12C-E3/61 comply with lead-free assembly standards and moisture sensitivity requirements?

Yes, SMAJ12C-E3/61 carries the E3 suffix indicating full RoHS compliance and qualification to JESD201 Class 1A whisker resistance. It meets MSL Level 1 per J-STD-020, allowing unlimited floor life and standard Pb-free reflow profiles up to 260 °C peak temperature - making SMAJ12C-E3/61 suitable for high-volume automated manufacturing without dry-pack or baking requirements.

How does the thermal resistance of SMAJ12C-E3/61 impact its surge handling in real-world PCB layouts?

SMAJ12C-E3/61 has a typical junction-to-ambient thermal resistance (R_θJA) of 120 °C/W when mounted on the minimum recommended 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads. This means sustained or repetitive surges may elevate junction temperature significantly - so SMAJ12C-E3/61 is optimized for infrequent, short-duration transients (e.g., ESD, switching spikes), not continuous power dissipation.

SMAJ12C-E3/61 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-214AC, SMA

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Zener

Unidirectional Channels:: -

Bidirectional Channels:: 1

Voltage - Reverse Standoff (Typ):: 12V

Voltage - Breakdown (Min):: 13.3V

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

Current - Peak Pulse (10/1000µs):: 18.2A

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)

SMAJ12C-E3/61 FAQ

1.How can I place an order for SMAJ12C-E3/61 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ12C-E3/61 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 SMAJ12C-E3/61 reliable?

The price and inventory of SMAJ12C-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ12C-E3/61 is usually 5 days.

3.What payment methods are accepted for SMAJ12C-E3/61?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12C-E3/61 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ12C-E3/61?

SMAJ12C-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ12C-E3/61 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 SMAJ12C-E3/61?

For technical support, including SMAJ12C-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12C-E3/61 requirements.

6.How does Aetrix verify that SMAJ12C-E3/61 is sourced from the original manufacturer or authorized distributors?

All SMAJ12C-E3/61 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 SMAJ12C-E3/61 meets industry standards.

7.What is the process for return or replacement of SMAJ12C-E3/61?

All SMAJ12C-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12C-E3/61, 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 SMAJ12C-E3/61 part is unused and in its original packaging.

Return procedure for SMAJ12C-E3/61:

1.Submit a request within 90 days.

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

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