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Taiwan Semiconductor Corporation SMCJ14A
- Part No.:
- SMCJ14A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ14A.pdf
- Description:
- TVS DIODE 14VWM 23.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:11,313
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Product details
Overview
SMCJ14A from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 14V working stand-off voltage (VWM), 15.6–17.2V breakdown voltage (VBR), and 23.2V maximum clamping voltage (VC) at 67A peak pulse current - designed for automotive load-dump and inductive switching surge protection in power supply rails.
For engineers reviewing the SMCJ14A datasheet, SMCJ14A pinout, SMCJ14A application, or SMCJ14A equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, unidirectional polarity marking, IEC 61000-4-5/ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and thermal derating above 25°C ambient.
Technical Context
The SMCJ14A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (15.6–17.2V at 1mA test current), then clamping transients to ≤23.2V at 67A (10/1000μs waveform). Its glass-passivated junction ensures stable breakdown and low leakage (<1μA at 14V).
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation up to TJ = +150°C. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for SMC molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 15.6 V / 17.2 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold |
| VC @ IPPM | 23.2 V - Clamped voltage during 67 A, 10/1000 μs surge, limiting stress on downstream circuitry |
| PPK | 1500 W - Peak pulse power handling capability per single 1 ms transient |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage, ensuring minimal standby power loss |
| TJ max | +150 °C - Maximum junction temperature, supporting under-hood automotive use |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with cathode band marking |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads; polarity indicated by cathode band on one end; weight ≈0.210 g; moisture sensitivity level (MSL) 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path in unidirectional configuration |
| Cathode | Reverse-biased surge clamping terminal | Connected to protected line (e.g., 12V rail); cathode band identifies this terminal physically |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over time and temperature, critical for long-term reliability in automotive environments |
| Fast response time <1.0 ps | Clamps ESD and fast transients before sensitive logic or analog circuitry sustains damage |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive electrical system immunity testing, including battery disconnect and inductive load dump |
| RoHS & halogen-free compliant | Fulfills environmental compliance requirements for EU and global electronics manufacturing |
| Junction-to-case thermal resistance = 10°C/W | Enables efficient heat transfer to PCB copper pour or heatsink, supporting high-reliability power rail protection |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator overshoot. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges before they reach DC-DC converters or microcontrollers. Use Value: Limits transient voltage to 23.2V, maintaining safe margin below typical 28V absolute maximum ratings of automotive-grade regulators and MCUs. | Use Scenario: Safeguarding 24V digital input modules in programmable logic controllers from field-wiring induced transients. IC Role / Device Role / Timing Role: Standoff device across input terminals to absorb inductive kickback from solenoid or relay coils. Use Value: Withstands 67A peak impulse current without degradation, preserving signal integrity and preventing false triggering in industrial control systems. |
| LED Driver Overvoltage Protection | Telecom Power Supply Clamp |
Use Scenario: Shielding constant-current LED drivers from voltage spikes caused by hot-plug events or cable discharge. IC Role / Device Role / Timing Role: Parallel-connected TVS on driver output to shunt excess energy during transient overvoltage conditions. Use Value: Low clamping voltage (23.2V) prevents latch-up or gate oxide damage in MOSFET-based LED switch controllers. | Use Scenario: Clamping secondary-side 48V telecom power rails against lightning-induced surges entering via Ethernet or auxiliary lines. IC Role / Device Role / Timing Role: Primary surge suppression element on DC input bus prior to DC-DC conversion stage. Use Value: 1500W peak power rating handles high-energy 10/1000μs transients common in outdoor telecom infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14A (Bourns) | Same VWM (14V), lower PPK (600W), SMB package (smaller footprint, higher RθJA) | Lower surge energy handling; suitable only for lighter-duty applications like consumer electronics | Select SMCJ14A when 1500W surge immunity is required - e.g., automotive or industrial environments with high inductive loads. |
| P6SMB14A (ON Semiconductor) | Identical VWM (14V), same DO-214AB package, but rated at 600W PPK and higher VC (25.8V) | Higher clamping voltage reduces design margin; not recommended for tight-tolerance 12V rail protection | SMCJ14A provides 2.6V lower clamping than P6SMB14A at rated current, improving system-level robustness. |
Compared with SMBJ14A and P6SMB14A, the SMCJ14A delivers superior surge energy absorption (1500W vs. 600W) and tighter clamping (23.2V vs. ≥25.8V), making it the preferred choice for demanding automotive and industrial power rail protection where margin and reliability are critical.
Availability
SMCJ14A is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input conditioning, LED driver overvoltage safeguarding, and telecom power rail clamping requiring stable component supply across production lifecycles.
Supply support for SMCJ14A 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and computing markets.
The SMCJ series is part of TSC's high-power TVS portfolio, engineered specifically for ISO 7637-2-compliant automotive surge immunity and high-energy industrial transient suppression in surface-mount form factors.
FAQ
What is the clamping voltage of the SMCJ14A and how is it measured?
The SMCJ14A has a maximum clamping voltage (VC) of 23.2 V, measured at a peak pulse current (IPPM) of 67 A with a 10/1000 µs waveform per IEC 61000-4-5. This value represents the upper limit of voltage seen by downstream circuitry during a standardized surge event, and is confirmed in the official Taiwan Semiconductor datasheet revision S2104.
Is the SMCJ14A unidirectional or bidirectional, and how is polarity identified?
The SMCJ14A is a unidirectional TVS diode. Polarity is marked by a cathode band on the DO-214AB (SMC) package body - the banded end connects to the protected line (e.g., 12V rail), while the anode connects to ground. Bidirectional variants use "CA" suffix (e.g., SMCJ14CA), which the SMCJ14A does not carry.
Does the SMCJ14A meet automotive transient immunity standards?
Yes, the SMCJ14A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements, as explicitly stated in the Taiwan Semiconductor datasheet. It is qualified for use in automotive power networks subject to load dump, supply interruption, and coupled transients - though Pulse 5a (load dump) requires verification of system-level layout and grounding.
What is the maximum junction temperature and thermal resistance of the SMCJ14A?
The SMCJ14A has a maximum junction temperature (TJ) of +150°C and thermal resistances of RθJA = 55°C/W (junction-to-ambient) and RθJC = 10°C/W (junction-to-case). These values assume standard PCB mounting with adequate copper pour; actual thermal performance depends on board layout and airflow.
Can the SMCJ14A be used in place of the SMCJ14 (non-A) variant?
No - the SMCJ14A and SMCJ14 are distinct parts. The SMCJ14A has tighter VBR tolerance (15.6–17.2 V) and lower clamping voltage (23.2 V) versus SMCJ14 (15.6–19.1 V, VC = 25.8 V). Substitution may compromise surge margin; always verify design intent and test data before interchange.
SMCJ14A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 64.7A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ14A FAQ
1.How can I place an order for SMCJ14A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ14A 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 SMCJ14A reliable?
The price and inventory of SMCJ14A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ14A is usually 5 days.
3.What payment methods are accepted for SMCJ14A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ14A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ14A?
SMCJ14A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ14A 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 SMCJ14A?
For technical support, including SMCJ14A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ14A requirements.
6.How does Aetrix verify that SMCJ14A is sourced from the original manufacturer or authorized distributors?
All SMCJ14A 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 SMCJ14A meets industry standards.
7.What is the process for return or replacement of SMCJ14A?
All SMCJ14A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ14A, 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 SMCJ14A part is unused and in its original packaging.
Return procedure for SMCJ14A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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