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

Vishay General Semiconductor - Diodes Division SMCJ12CAHM3/H

Name: SMCJ12CAHM3/H
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMCJ12CAHM3/H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMCJ12CAHM3/H

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-214AB, SMC

Datasheet:: SMCJ12CAHM3/H.pdf

Description:: TVS DIODE 12VWM 19.9VC DO214AB

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Product details

Overview

SMCJ12CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 12 V standoff voltage (V_WM), 19.9 V maximum clamping voltage (V_C) at 75.4 A peak pulse current (I_PPM), and 1500 W peak pulse power (P_PPM) with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.

For engineers reviewing the SMCJ12CAHM3/H datasheet, SMCJ12CAHM3/H pinout, SMCJ12CAHM3/H application, or SMCJ12CAHM3/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), junction temperature derating above 25 °C, and compatibility with standard SMC footprint layouts per JESD22-B102 solderability requirements.

Technical Context

This device operates as a voltage-clamped surge protector using an avalanche breakdown mechanism, with symmetrical bidirectional conduction enabling protection against both positive and negative transients without polarity dependency. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<5 µA at V_WM), while MSL Level 1 rating supports lead-free reflow up to 260 °C peak.

The SMCJ12CAHM3/H delivers consistent clamping performance across -55 °C to +150 °C operating range, with thermal resistance R_θJA = 75 °C/W and R_θJL = 15 °C/W - critical for thermal design in high-power-density automotive modules where sustained surge events may elevate junction temperature rapidly.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	12 V - maximum continuous reverse working voltage before clamping activation; defines safe operating margin for 12 V nominal systems.
V_BR min/max	13.3 V / 14.7 V - breakdown voltage range at 1 mA test current; ensures reliable turn-on within defined tolerance band.
V_C	19.9 V - maximum clamped voltage at 75.4 A I_PPM; determines worst-case stress on downstream ICs during surge.
P_PPM	1500 W - peak pulse power handling with 10/1000 µs waveform; supports high-energy transients like ISO 7637-2 Pulse 1/2/5a.
T_J max	+150 °C - maximum junction temperature; enables operation in under-hood automotive environments with minimal derating.
Package	SMC (DO-214AB) - standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad requirement for thermal dissipation.
Qualification	AEC-Q101 qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing.

Pinout & Package

SMCJ12CAHM3/H uses the SMC (DO-214AB) package: a surface-mount, molded plastic case with two terminals, no polarity marking (bidirectional), matte tin-plated leads compliant with J-STD-002 and JESD22-B102, and UL 94 V-0 flammability rating.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Transient return path (bidirectional)	Provides symmetrical conduction path for both polarities; connects to protected line or ground reference depending on layout.
Cathode	Transient return path (bidirectional)	Functionally identical to Anode in bidirectional configuration; no cathode band marking present on device body.

Key Features

Feature	Design Value
Bidirectional clamping	Enables single-device protection of AC-coupled or floating signal lines without polarity concerns - e.g., CAN bus or RS-485 differential pairs.
AEC-Q101 qualification	Validated for automotive applications including engine control units, ADAS sensors, and infotainment power supplies requiring long-term field reliability.
Halogen-free & RoHS-compliant (HM3)	Meets global environmental regulations and JEDEC JESD201 Class 2 whisker resistance, supporting green manufacturing and extended product lifecycle.
Low incremental surge resistance	Minimizes voltage overshoot during fast-rising transients (e.g., ESD >15 kV contact discharge), improving immunity of downstream analog front-ends.
MSL Level 1 moisture sensitivity	Allows unlimited floor life and compatibility with standard lead-free reflow profiles up to 260 °C peak, eliminating bake requirements prior to assembly.

Applications

Automotive Power Rail Protection	Industrial Sensor Interface Protection
Use Scenario: Protecting 12 V battery-supplied microcontrollers and CAN transceivers from load dump and jump-start surges per ISO 7637-2. IC Role / Device Role / Timing Role: Voltage-clamped shunt element that diverts surge energy to ground before it reaches sensitive IC inputs. Use Value: Limits transient voltage to ≤19.9 V at 75.4 A, preventing latch-up or gate oxide damage in 3.3 V/5 V logic devices powered from same rail.	Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input cards in factory automation. IC Role / Device Role / Timing Role: Bidirectional clamp placed between sensor output and ADC input to absorb inductive switching noise from nearby solenoids or relays. Use Value: Maintains signal integrity by clamping ±19.9 V spikes without polarity inversion, preserving DC accuracy and avoiding false readings during EMC testing.
Telecom Line Surge Suppression	Consumer Device USB Port Protection
Use Scenario: Shielding Ethernet PHY interface circuits in PoE-powered switches from lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Primary-level TVS placed at RJ45 connector entry point to limit common-mode transients before isolation transformers. Use Value: Handles 1500 W peak pulses while maintaining <5 µA leakage at 12 V, ensuring low standby power and no signal attenuation at 100 MHz data rates.	Use Scenario: Adding secondary-level surge protection to USB 2.0 data lines (D+/D−) in portable medical monitors exposed to ESD in clinical environments. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (typ. <100 pF) integrated into USB routing to suppress ±15 kV contact ESD per IEC 61000-4-2. Use Value: Clamps ESD events within <1 ns response time while adding negligible capacitance - preserving USB full-speed signal integrity and eye diagram compliance.

Automotive Power Rail Protection

Industrial Sensor Interface Protection

Use Scenario: Protecting 12 V battery-supplied microcontrollers and CAN transceivers from load dump and jump-start surges per ISO 7637-2.

IC Role / Device Role / Timing Role: Voltage-clamped shunt element that diverts surge energy to ground before it reaches sensitive IC inputs.

Use Value: Limits transient voltage to ≤19.9 V at 75.4 A, preventing latch-up or gate oxide damage in 3.3 V/5 V logic devices powered from same rail.

Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input cards in factory automation.

IC Role / Device Role / Timing Role: Bidirectional clamp placed between sensor output and ADC input to absorb inductive switching noise from nearby solenoids or relays.

Use Value: Maintains signal integrity by clamping ±19.9 V spikes without polarity inversion, preserving DC accuracy and avoiding false readings during EMC testing.

Telecom Line Surge Suppression

Consumer Device USB Port Protection

Use Scenario: Shielding Ethernet PHY interface circuits in PoE-powered switches from lightning-induced surges on twisted-pair cabling.

IC Role / Device Role / Timing Role: Primary-level TVS placed at RJ45 connector entry point to limit common-mode transients before isolation transformers.

Use Value: Handles 1500 W peak pulses while maintaining <5 µA leakage at 12 V, ensuring low standby power and no signal attenuation at 100 MHz data rates.

Use Scenario: Adding secondary-level surge protection to USB 2.0 data lines (D+/D−) in portable medical monitors exposed to ESD in clinical environments.

IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (typ. <100 pF) integrated into USB routing to suppress ±15 kV contact ESD per IEC 61000-4-2.

Use Value: Clamps ESD events within <1 ns response time while adding negligible capacitance - preserving USB full-speed signal integrity and eye diagram compliance.

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	Lower P_PPM (400 W), smaller SMA package, higher R_θJA (110 °C/W)	Not suitable for ISO 7637-2 load dump; limited to low-energy ESD and inductive switch-off events.	Select when board space is constrained and surge energy is below 400 W - e.g., consumer USB ports or low-voltage I/O buffers.
SMCJ12AHE3/H	Unidirectional version, same P_PPM/V_C, commercial-grade (non-AEC-Q101), RoHS-compliant E3 suffix	Requires correct polarity placement; unsuitable for AC or floating signals; lacks automotive qualification evidence.	Choose only for cost-sensitive non-automotive designs where polarity is fixed and AEC-Q101 is not mandated - e.g., industrial HMIs or white goods control boards.

Compared with SMCJ12CAHM3/H, SMAJ12CA offers reduced surge capacity in a smaller footprint, while SMCJ12AHE3/H provides identical clamping but requires polarity-aware layout and lacks automotive validation - making SMCJ12CAHM3/H the sole option meeting AEC-Q101, bidirectionality, and 1500 W rating simultaneously.

Availability

SMCJ12CAHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom infrastructure equipment, and consumer USB protection circuits requiring stable component supply and long-term lifecycle support.

Supply support for SMCJ12CAHM3/H 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.

The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated through robust, standardized, and qualified components.

FAQ

What does the 'CA' suffix indicate in SMCJ12CAHM3/H?

The 'CA' suffix in SMCJ12CAHM3/H denotes a bidirectional configuration, meaning the device provides symmetrical clamping for both positive and negative voltage transients without polarity dependence. This is essential for protecting AC-coupled lines, differential buses like CAN or RS-485, and floating sensor outputs - unlike unidirectional variants (e.g., SMCJ12A) which require correct cathode orientation. The SMCJ12CAHM3/H maintains identical electrical specs in both directions, including V_BR, V_C, and I_PPM.

How does the HM3 suffix affect SMCJ12CAHM3/H compliance and assembly?

The HM3 suffix in SMCJ12CAHM3/H indicates halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance - verified per Vishay's material categorization standard. It supports lead-free reflow up to 260 °C peak (MSL Level 1), eliminates post-assembly baking, and meets automotive environmental mandates. Unlike E3-suffix parts, HM3 ensures full halogen-free content without compromising solderability or thermal performance, making SMCJ12CAHM3/H suitable for green manufacturing and export-controlled applications.

What is the maximum clamping voltage of SMCJ12CAHM3/H and why does it matter?

The maximum clamping voltage (V_C) of SMCJ12CAHM3/H is 19.9 V at 75.4 A peak pulse current (I_PPM) with a 10/1000 µs waveform. This value defines the highest voltage imposed on protected circuitry during a surge event - directly determining whether downstream ICs (e.g., 16 V-rated CAN transceivers or 5 V microcontrollers) remain within safe operating limits. Exceeding this clamping level risks permanent damage; thus, SMCJ12CAHM3/H's 19.9 V V_C enables robust protection of 12 V automotive systems while maintaining margin below typical IC absolute maximum ratings.

Can SMCJ12CAHM3/H replace SMCJ12AHE3/H in an existing design?

No - SMCJ12CAHM3/H cannot directly replace SMCJ12AHE3/H without layout review. While both share the same SMC package and 12 V V_WM, SMCJ12AHE3/H is unidirectional (requires cathode orientation) and lacks AEC-Q101 qualification, whereas SMCJ12CAHM3/H is bidirectional (no polarity marking) and AEC-Q101 qualified. Substituting SMCJ12CAHM3/H into a unidirectional layout may cause improper clamping or increased leakage; conversely, replacing SMCJ12CAHM3/H with SMCJ12AHE3/H forfeits automotive qualification and bidirectional capability - requiring redesign verification for each use case.

What thermal derating applies to SMCJ12CAHM3/H above 25 °C ambient?

SMCJ12CAHM3/H requires linear derating of peak pulse power (P_PPM) above 25 °C ambient temperature, per Figure 2 in Vishay document 88394: P_PPM decreases by approximately 1.1% per °C rise, reaching ~750 W at 75 °C and ~375 W at 125 °C. This reflects junction-to-ambient thermal resistance (R_θJA = 75 °C/W) and must be accounted for in high-temperature environments like engine compartments. Derating ensures T_J stays ≤150 °C during surge events - critical for maintaining clamping consistency and avoiding thermal runaway in SMCJ12CAHM3/H.

SMCJ12CAHM3/H Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-214AB, SMC

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Type:: Zener

Unidirectional Channels:: -

Bidirectional Channels:: 1

Voltage - Reverse Standoff (Typ):: 12V

Voltage - Breakdown (Min):: 13.3V

Voltage - Clamping (Max) @ Ipp:: 19.9V

Current - Peak Pulse (10/1000µs):: 75.4A

Power - Peak Pulse:: 1500W (1.5kW)

Power Line Protection:: No

Applications:: Telecom

Capacitance @ Frequency:: -

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AB (SMC)

SMCJ12CAHM3/H FAQ

1.How can I place an order for SMCJ12CAHM3/H through Aetrix?

Please submit a Request for Quotation (RFQ) for SMCJ12CAHM3/H 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 SMCJ12CAHM3/H reliable?

The price and inventory of SMCJ12CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12CAHM3/H is usually 5 days.

3.What payment methods are accepted for SMCJ12CAHM3/H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12CAHM3/H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMCJ12CAHM3/H?

SMCJ12CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMCJ12CAHM3/H 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 SMCJ12CAHM3/H?

For technical support, including SMCJ12CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12CAHM3/H requirements.

6.How does Aetrix verify that SMCJ12CAHM3/H is sourced from the original manufacturer or authorized distributors?

All SMCJ12CAHM3/H 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 SMCJ12CAHM3/H meets industry standards.

7.What is the process for return or replacement of SMCJ12CAHM3/H?

All SMCJ12CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12CAHM3/H, 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 SMCJ12CAHM3/H part is unused and in its original packaging.

Return procedure for SMCJ12CAHM3/H:

1.Submit a request within 90 days.

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

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