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Taiwan Semiconductor Corporation SMAJ14CA
- Part No.:
- SMAJ14CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CA.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,237
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Product details
Overview
SMAJ14CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 14 V working stand-off voltage (VWM), 15.6–17.2 V breakdown voltage (VBR), 23.2 V maximum clamping voltage (VC) at 17.2 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in switching mode power supplies, on-board DC/DC converters, and lighting applications.
For engineers reviewing the SMAJ14CA datasheet, SMAJ14CA pinout, SMAJ14CA application, or SMAJ14CA equivalent, key selection criteria include bidirectional clamping capability, sub-1 ps response time, <1 µA reverse leakage at VWM, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and DO-214AC (SMA) package compatibility with automated SMT placement.
Technical Context
The SMAJ14CA operates as a silicon avalanche diode configured for bidirectional transient suppression, with symmetrical electrical characteristics in both polarities due to its CA suffix designation. Its glass-passivated junction ensures stable breakdown behavior and low leakage, while the 10/1000 µs waveform-rated 400 W peak pulse power supports high-energy surge events without degradation.
It meets automotive-grade transient immunity standards including ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect, line drop), and Pulse 3a/3b (capacitive coupling, ignition noise), with operating junction temperature range from –55 °C to +150 °C and moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR @ IT = 1 mA | 15.6–17.2 V - Guaranteed avalanche breakdown onset, ensuring predictable clamping initiation |
| VC @ IPPM = 17.2 A | 23.2 V - Maximum voltage seen across terminals during 10/1000 µs surge, limiting downstream stress |
| PPPM | 400 W - Peak transient energy absorption capacity under standardized surge waveform |
| IR @ VWM | <1 µA - Minimal standby power loss and signal integrity impact in high-impedance circuits |
| Response Time | <1.0 ps - Enables clamping before sensitive ICs experience damaging overvoltage |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060 g mass and J-STD-002 solderability |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional operation means band denotes common reference point, not unidirectional polarity).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path terminal | Both terminals function identically; bidirectional clamping occurs regardless of voltage polarity applied |
| Cathode band marking | Reference orientation marker | Provides visual PCB layout alignment cue; no functional polarity distinction in CA configuration |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping architecture | Enables single-device protection of AC-coupled or floating DC lines without external polarity management |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Validated for automotive ECU, infotainment, and body electronics surge immunity requirements |
| Glass passivated junction | Ensures long-term stability of VBR and low IR drift across temperature and lifetime |
| Moisture sensitivity level 1 | Eliminates bake-out requirement prior to reflow, reducing manufacturing overhead and BOM risk |
| RoHS and halogen-free (IEC 61249-2-21) | Meets global environmental compliance mandates for industrial and automotive end equipment |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and sensor inputs against load dump and inductive switching transients in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed at connector interface to shunt surges before reaching PHY layer. Use Value: Limits transient voltage to ≤23.2 V during ISO 7637-2 Pulse 2b (100 V/2 Ω), preventing latch-up or damage to 3.3 V/5 V microcontrollers. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to relay coil flyback and field wiring ESD. IC Role / Device Role / Timing Role: Primary overvoltage clamp on front-end signal conditioning stage, upstream of optocoupler isolation. Use Value: Absorbs 400 W peak energy from 10/1000 µs surges while maintaining <1 µA leakage at 24 V nominal, preserving input threshold accuracy. |
| LED Driver Power Stage | USB-C Power Delivery Interface |
Use Scenario: Suppressing MOSFET switching spikes and input line transients in constant-current LED drivers for streetlight and architectural lighting. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor input to clamp fast-rising edge transients from nearby motor loads. Use Value: Clamps 100 V transients to 23.2 V within <1 ps, preventing overvoltage stress on primary-side controller ICs rated for 30 V absolute max. |
Use Scenario: Protecting CC1/CC2 pins and VBUS monitoring circuitry in USB-C PD sink implementations against hot-plug and ESD events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp integrated into ESD protection array adjacent to connector. Use Value: Provides 23.2 V clamping ceiling at 17.2 A while adding negligible capacitance (<100 pF), preserving USB-C signal integrity up to 10 Gbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ14CA (Bourns) | Same VWM (14 V), higher PPPM (600 W), larger SMB package (DO-214AA) | Requires PCB pad redesign; better suited for higher-energy industrial surges | Select when system-level testing exceeds 400 W surge margin or when thermal derating above 75 °C is required |
| P6SMB14CA (Littelfuse) | Identical VWM/VC specs, same DO-214AC package, but rated for 600 W PPPM (10/1000 µs) | Drop-in replacement in footprint; higher power headroom enables longer surge duration tolerance | Prefer when legacy designs require second-source availability with identical layout compatibility and enhanced surge margin |
Compared with SMBJ14CA and P6SMB14CA, the SMAJ14CA offers optimal cost-performance balance for space-constrained consumer and automotive applications where 400 W peak pulse power suffices and DO-214AC footprint minimizes board area - while maintaining full ISO 7637-2 compliance and sub-1 µA leakage at 14 V.
Availability
SMAJ14CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, LED driver power stages, and USB-C PD interface protection requiring stable component supply and full traceability.
Supply support for SMAJ14CA 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power management components since 1979.
The SMAJ series was developed specifically for AEC-Q101-qualified automotive and industrial transient suppression, emphasizing reliability under harsh thermal and surge conditions in compact DO-214AC packaging.
FAQ
What is the clamping voltage of SMAJ14CA under standard test conditions?
The SMAJ14CA has a maximum clamping voltage (VC) of 23.2 V when subjected to a 10/1000 µs waveform peak pulse current (IPPM) of 17.2 A. This value is measured per JEDEC standards and guarantees that downstream circuitry sees no more than 23.2 V during surge events - critical for protecting 24 V-rated interface ICs and microcontrollers. The SMAJ14CA achieves this with sub-1 ps response time and symmetrical bidirectional behavior.
Is SMAJ14CA suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the SMAJ14CA is explicitly validated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements - making it appropriate for engine control units, body control modules, and infotainment systems. Its 14 V working voltage aligns with 12 V automotive battery systems, and its 23.2 V clamping ceiling prevents damage during load dump transients. The SMAJ14CA also carries AEC-Q101 qualification per Taiwan Semiconductor's product documentation.
How does the CA suffix affect the functionality of SMAJ14CA compared to SMAJ14A?
The "CA" suffix designates bidirectional operation, meaning the SMAJ14CA provides symmetrical clamping in both forward and reverse directions - unlike the unidirectional SMAJ14A. This eliminates the need for dual-diode configurations in AC-coupled or floating DC lines. The SMAJ14CA maintains identical VWM (14 V), VBR (15.6–17.2 V), and VC (23.2 V) ratings in either polarity, enabling simplified layout and reduced BOM count versus unidirectional alternatives.
What is the maximum steady-state power dissipation rating for SMAJ14CA?
The SMAJ14CA has a steady-state power dissipation (PD) rating of 1 W at 25 °C ambient temperature, derated linearly above that per the pulse derating curve in the datasheet. This rating applies to continuous DC or low-frequency AC stress - not transient events. For surge protection, the device relies on its 400 W peak pulse power (PPPM) capability under 10/1000 µs conditions. The SMAJ14CA's 150 °C maximum junction temperature ensures safe operation even under sustained thermal load when properly mounted on thermally adequate PCB copper.
Does SMAJ14CA require special handling or baking before reflow soldering?
No, the SMAJ14CA is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30 °C/60% RH without baking or dry-pack requirements. This simplifies SMT assembly logistics and eliminates pre-reflow bake cycles - reducing process time and avoiding potential thermal damage to the glass-passivated junction. The SMAJ14CA's matte tin-plated leads also comply with J-STD-002 for reliable solder wetting during lead-free reflow profiles.
SMAJ14CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- 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):
- 17.2A
- 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)
SMAJ14CA FAQ
1.How can I place an order for SMAJ14CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CA 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 SMAJ14CA reliable?
The price and inventory of SMAJ14CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14CA is usually 5 days.
3.What payment methods are accepted for SMAJ14CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CA?
SMAJ14CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CA 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 SMAJ14CA?
For technical support, including SMAJ14CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CA requirements.
6.How does Aetrix verify that SMAJ14CA is sourced from the original manufacturer or authorized distributors?
All SMAJ14CA 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 SMAJ14CA meets industry standards.
7.What is the process for return or replacement of SMAJ14CA?
All SMAJ14CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CA, 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 SMAJ14CA part is unused and in its original packaging.
Return procedure for SMAJ14CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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