My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ12CA-M3/9AT
- Part No.:
- SMCJ12CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12CA-M3/9AT.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,657
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ12CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 19.9 V maximum clamping voltage at 75.4 A peak pulse current and 12 V standoff voltage. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching surges and lightning-induced transients.
For engineers reviewing the SMCJ12CA-M3/9AT datasheet, SMCJ12CA-M3/9AT pinout, SMCJ12CA-M3/9AT application, or SMCJ12CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, 1500 W PPPM rating, 12 V VWM, 13.3–14.7 V breakdown range at 1 mA, and halogen-free RoHS-compliant M3 termination.
Technical Context
This device operates as a voltage-clamping protection element in parallel with protected circuitry, responding within picoseconds to transient overvoltages exceeding its reverse standoff voltage (VWM = 12 V). Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths.
Constructed with a glass-passivated junction and housed in an SMC (DO-214AB) package rated MSL Level 1, the SMCJ12CA-M3/9AT delivers low incremental surge resistance and stable thermal performance up to 150 °C junction temperature, with typical junction-to-lead thermal resistance of 15 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 19.9 V at 75.4 A - Clamped voltage during 10/1000 µs surge, limiting stress on downstream components |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 µs waveform, enabling robust surge immunity |
| ID @ VWM | 5.0 µA - Low leakage current ensuring minimal standby power loss and signal integrity |
| TJ max | +150 °C - Maximum junction temperature supporting operation in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal requirement |
Pinout & Package
SMCJ12CA-M3/9AT uses the SMC (DO-214AB) package: a surface-mount, bidirectional device with no polarity marking; both terminals are electrically symmetric and function as interchangeable anode/cathode pairs depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Interchangeable terminal; conducts during positive or negative transients relative to the other terminal |
| Terminal 2 | Anode/Cathode (bidirectional) | Interchangeable terminal; completes symmetrical clamping path with Terminal 1 |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses, or ungrounded circuits without polarity constraints |
| 1500 W peak pulse power | Withstands high-energy transients such as ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Combination Wave surges |
| Halogen-free M3 termination | Meets JESD201 Class 2 whisker resistance and RoHS compliance for lead-free reflow assembly |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking, simplifying SMT production logistics |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes overvoltage exposure to protected ICs while maintaining margin above normal operating voltage |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and jump-start transients on 12 V vehicle power rails. IC Role / Device Role / Timing Role: Parallel-connected voltage clamp that diverts surge current away from sensitive electronics during >100 V transients. Use Value: Limits voltage seen by protected ICs to ≤19.9 V during 75.4 A surges, preventing latch-up or gate oxide damage in automotive-grade MCUs. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) and digital sensor interfaces (I²C, SPI) in factory automation PLC modules. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed across signal and ground, absorbing ESD and inductive kickback from solenoid drivers. Use Value: Maintains signal integrity with only 5.0 µA leakage at 12 V, while clamping fast-rising transients (<1 ns response) before they propagate into precision ADC front-ends. |
| Telecom Line Interface Protection | Consumer Equipment DC Input Protection |
Use Scenario: Shielding Ethernet PHY magnetics bias windings and PoE controller inputs from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS deployed at connector entry point to shunt common-mode surges before reaching isolation barriers. Use Value: Handles 1500 W peak pulses per IEC 61000-4-5 Ed. 3, enabling compliance with EN 61000-4-5 Level 4 (4 kV line-earth) without additional stages. | Use Scenario: Securing USB-C PD input rails and internal 12 V distribution networks in smart home hubs and set-top boxes against AC adapter fault conditions. IC Role / Device Role / Timing Role: Standoff-rated protector that remains non-conductive during normal 12 V operation but activates instantly during overvoltage events. Use Value: Provides fail-safe protection with 13.3–14.7 V VBR tolerance, ensuring reliable turn-on before downstream LDOs or PMICs exceed absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC12CA | Lower PPPM (1000 W), same VWM (12 V), smaller SMA package (DO-214AC) | Reduced surge margin; suitable only for lower-energy threats (e.g., IEC 61000-4-2 ESD, not IEC 61000-4-5) | Select when board space is constrained and surge requirements are limited to ±15 kV contact ESD. |
| SMCJ12A-M3/9AT | Unidirectional version; cathode-banded; identical VWM, VBR, VC, and PPPM ratings | Requires correct polarity placement; unsuitable for AC or floating nodes | Choose only for DC-biased lines where polarity is fixed and reverse conduction must be blocked. |
Compared with SAC12CA and SMCJ12A-M3/9AT, the SMCJ12CA-M3/9AT uniquely provides full bidirectional 1500 W surge protection in the industry-standard SMC footprint-enabling drop-in replacement in existing layouts while supporting AC-coupled, differential, or ungrounded signal paths without redesign.
Availability
SMCJ12CA-M3/9AT is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, and telecom line interface protection requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ12CA-M3/9AT 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, ruggedness, and automotive qualification.
The SMCJ series is engineered specifically for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated.
FAQ
What does the "CA" suffix indicate in SMCJ12CA-M3/9AT?
The "CA" suffix denotes a bidirectional configuration: the SMCJ12CA-M3/9AT provides symmetrical clamping for both positive and negative voltage transients, with identical electrical characteristics in either polarity. Unlike unidirectional variants (e.g., SMCJ12A), it has no cathode band marking and requires no polarity alignment during placement-making it ideal for AC signal lines, differential buses, or floating grounds where voltage polarity is undefined or alternating.
How does the M3 suffix affect solderability and compliance of SMCJ12CA-M3/9AT?
SMCJ12CA-M3/9AT features halogen-free, RoHS-compliant matte tin-plated leads qualified to JESD201 Class 2 for whisker resistance and compliant with J-STD-002 and JESD22-B102 for solderability. The M3 designation confirms full compatibility with lead-free reflow profiles up to 260 °C peak, meeting IPC-A-610 Class 2/3 requirements without compromising joint reliability or long-term intermetallic stability.
What is the thermal derating behavior of SMCJ12CA-M3/9AT above 25 °C ambient?
SMCJ12CA-M3/9AT follows linear derating above TA = 25 °C: its peak pulse power (PPPM) decreases proportionally per Figure 2 in the Vishay datasheet (Document 88394), with full 1500 W capability at 25 °C dropping to ~1125 W at 75 °C and ~750 W at 125 °C. This reflects junction-to-ambient thermal resistance (RθJA = 75 °C/W) and must be accounted for in high-temperature enclosures or densely packed PCBs lacking thermal relief.
Can SMCJ12CA-M3/9AT be used in place of a unidirectional TVS like SMCJ12A-M3/9AT?
Yes, SMCJ12CA-M3/9AT can replace SMCJ12A-M3/9AT in most DC applications-but only if reverse conduction is acceptable. Since the CA version clamps equally in both directions, it will conduct during negative excursions where the unidirectional part would block. For strictly DC-biased lines with defined polarity and no risk of reverse voltage, the unidirectional variant offers tighter leakage control; however, SMCJ12CA-M3/9AT adds design margin for unexpected polarity reversals or AC coupling.
What is the minimum recommended PCB pad layout for optimal thermal and surge performance of SMCJ12CA-M3/9AT?
Vishay specifies a minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad area per terminal for SMCJ12CA-M3/9AT to achieve rated 1500 W PPPM and maintain RθJL = 15 °C/W. Smaller pads reduce surge current capacity and increase junction temperature rise during repeated transients. Thermal vias under pads and internal ground/power planes further improve heat dissipation and sustain performance in high-duty-cycle protection scenarios.
SMCJ12CA-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ12CA-M3/9AT FAQ
1.How can I place an order for SMCJ12CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12CA-M3/9AT 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 SMCJ12CA-M3/9AT reliable?
The price and inventory of SMCJ12CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ12CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12CA-M3/9AT?
SMCJ12CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12CA-M3/9AT 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 SMCJ12CA-M3/9AT?
For technical support, including SMCJ12CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ12CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ12CA-M3/9AT 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 SMCJ12CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ12CA-M3/9AT?
All SMCJ12CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12CA-M3/9AT, 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 SMCJ12CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ12CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12CA-M3/9AT Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
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…
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, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
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.
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.
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…
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…
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…
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 …
