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Taiwan Semiconductor Corporation SMDJ14CAH
- Part No.:
- SMDJ14CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ14CAH.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,552
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Product details
Overview
SMDJ14CAH from Taiwan Semiconductor is a bidirectional 3000W 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 129.3A peak pulse current - designed for automotive-grade ESD and load-switching surge protection in power supply rails and I/O interfaces.
For engineers reviewing the SMDJ14CAH datasheet, SMDJ14CAH pinout, SMDJ14CAH application, or SMDJ14CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, and DO-214AB thermal performance (RθJA = 75°C/W).
Technical Context
The SMDJ14CAH is a glass-passivated, single-die, bidirectional TVS diode optimized for high-energy transients in harsh environments. It operates symmetrically in both polarities, delivering 3000W peak pulse power (10/1000µs waveform) with clamping voltage ≤23.2V at 129.3A, and maintains stable performance across -55°C to +175°C junction temperature range.
Its design meets automotive immunity standards including ISO 7637-2 Pulse 1 (inductive load dump suppression), Pulse 2a/2b (battery disconnect/relay bounce), and Pulse 3a/3b (capacitive coupling noise), while supporting automated SMT placement via matte tin-plated leads compliant with J-STD-002 and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin for 12V automotive systems. |
| VBR @ IT=1mA | 15.6–17.2 V - Breakdown threshold range; ensures reliable turn-on during fast transients without premature conduction. |
| VC @ IPPM | 23.2 V - Clamped voltage at 129.3 A peak pulse; limits downstream IC stress below typical 24V system overvoltage thresholds. |
| PPK | 3000 W - Peak pulse power rating (10/1000µs); sustains high-energy surges from load switching or lightning-induced coupling. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood or industrial enclosures without derating. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; supports 6.5W steady-state dissipation on standard 1-in² copper pad. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration with cathode band omitted (symmetrical terminals). Weight: 0.290 g. Molding compound rated UL 94V-0; terminals matte tin-plated per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient terminal | No polarity marking required; either terminal accepts positive or negative surge - simplifies PCB layout and eliminates orientation errors. |
| Case (cathode band absent) | Thermal & mechanical interface | DO-214AB body provides low-inductance path and 15°C/W junction-to-lead thermal resistance for efficient heat transfer to PCB copper. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - enables use in engine control, ADAS, and infotainment without additional qualification effort. |
| ISO 7637-2 compliance | Passes Pulse 1 (−150V/0.5Ω), Pulse 2a (+100V), Pulse 2b (−100V), Pulse 3a/3b (±50V) - covers full range of vehicle-level EMC immunity tests. |
| Sub-1ps response time | Clamps transients before sensitive logic or analog circuitry responds - protects CAN, LIN, and sensor interfaces from ESD and fast-rising spikes. |
| Moisture sensitivity level 1 | No floor life limitation or baking requirement prior to reflow - reduces manufacturing overhead and avoids moisture-related popcorning. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - meets environmental compliance mandates for global OEM supply chains. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional clamping device placed upstream of DC-DC converters and microcontrollers. Use Value: Limits voltage to ≤23.2V during 3000W pulses, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: Shielding 4–20mA or RS-485 sensor nodes from field-induced surges in factory automation. IC Role / Device Role / Timing Role: Primary surge shunt at connector entry point, before signal conditioning circuitry. Use Value: Responds in <1ps to divert >129A transients, preserving ±15V input tolerance of isolated amplifiers and transceivers. |
| Telecom Line Card Protection | Consumer USB-C Port Protection |
Use Scenario: Safeguarding PoE-powered Ethernet switches against lightning-induced common-mode surges on RJ45 lines. IC Role / Device Role / Timing Role: Common-mode TVS pair across differential pairs (e.g., TX+/TX−, RX+/RX−). Use Value: Symmetric 14V VWM allows direct integration without bias networks; 23.2V VC ensures PHY ICs remain within absolute maximum ratings. | Use Scenario: Adding robustness to USB-C receptacles exposed to user-handled ESD events and hot-plug voltage overshoot. IC Role / Device Role / Timing Role: Bidirectional clamp between VBUS and ground, and between CC/D+/D− lines and ground. Use Value: Withstands ±30kV contact ESD (IEC 61000-4-2) and clamps to <24V - prevents port controller reset or USB PD negotiation failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14CA | Lower PPK (400W), higher VC (23.2V → 25.8V), SMA package (smaller thermal mass) | Not suitable for ISO 7637-2 Pulse 1 or high-energy load dump; limited to consumer-grade ESD only | Select when space-constrained and surge energy ≤400W; avoid for automotive or industrial mains-connected designs. |
| TPSMD14C | Same PPK (3000W), identical VWM/VC specs, but AEC-Q101 not claimed; RθJA = 80°C/W vs. 75°C/W | Acceptable for non-automotive industrial use; requires validation for automotive qualification programs | Choose if AEC-Q101 is not mandated and cost sensitivity outweighs qualification assurance. |
Compared with SMDJ14CAH, SMAJ14CA offers smaller footprint but insufficient energy handling for automotive transients, while TPSMD14C matches electrical specs but lacks formal AEC-Q101 certification - making SMDJ14CAH the preferred choice where automotive reliability and ISO 7637-2 compliance are mandatory.
Availability
SMDJ14CAH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom line card surge immunity, and USB-C port ESD resilience requiring stable component supply and long-term lifecycle support.
Supply support for SMDJ14CAH 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, with global distribution and AEC-Q101-compliant production lines.
The SMDJ series is engineered specifically for high-reliability automotive and industrial transient suppression - emphasizing robust clamping, fast response, and standardized packaging for automated assembly and thermal management.
FAQ
What does the "CAH" suffix indicate in SMDJ14CAH?
The "CAH" suffix denotes a bidirectional configuration with symmetrical clamping behavior in both polarities. Unlike unidirectional variants (e.g., SMDJ14AH), SMDJ14CAH has no cathode marking and functions identically for positive and negative transients - essential for AC-coupled or floating signal lines where polarity is undefined.
Is SMDJ14CAH qualified for automotive applications?
Yes, SMDJ14CAH is AEC-Q101 qualified and explicitly tested to ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b standards. Its 175°C maximum junction temperature, moisture sensitivity level 1, and JESD 201 Class 2 whisker resistance confirm suitability for under-hood and chassis-mounted automotive modules.
What is the maximum clamping voltage of SMDJ14CAH and at what current?
The maximum clamping voltage (VC) of SMDJ14CAH is 23.2 V, measured at the peak pulse current (IPPM) of 129.3 A under the standard 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and ensures downstream components remain within safe voltage limits.
Can SMDJ14CAH replace SMDJ14AH in an existing design?
No - SMDJ14CAH is bidirectional while SMDJ14AH is unidirectional with a defined cathode. Substituting SMDJ14CAH for SMDJ14AH may cause unintended conduction in DC-biased circuits. Use SMDJ14CAH only where symmetrical clamping is required; verify polarity, grounding, and circuit topology before replacement.
What is the thermal resistance and how does it affect PCB layout for SMDJ14CAH?
SMDJ14CAH has RθJA = 75°C/W and RθJL = 15°C/W. To maintain TJ ≤175°C at full 6.5W steady-state dissipation, the PCB must provide ≥1 in² of 2-oz copper connected to both terminals. Thermal vias under the pad and minimal trace length reduce thermal impedance and prevent localized overheating during repetitive surges.
SMDJ14CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 129.3A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ14CAH FAQ
1.How can I place an order for SMDJ14CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ14CAH 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 SMDJ14CAH reliable?
The price and inventory of SMDJ14CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ14CAH is usually 5 days.
3.What payment methods are accepted for SMDJ14CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ14CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ14CAH?
SMDJ14CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ14CAH 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 SMDJ14CAH?
For technical support, including SMDJ14CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ14CAH requirements.
6.How does Aetrix verify that SMDJ14CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ14CAH 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 SMDJ14CAH meets industry standards.
7.What is the process for return or replacement of SMDJ14CAH?
All SMDJ14CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ14CAH, 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 SMDJ14CAH part is unused and in its original packaging.
Return procedure for SMDJ14CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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