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Taiwan Semiconductor Corporation SMAJ14C
- Part No.:
- SMAJ14C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14C.pdf
- Description:
- 400W, 17.4V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,151
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Product details
Overview
SMAJ14C from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 14V working stand-off voltage (VWM), 15.6–19.1V breakdown voltage (VBR @ 1mA), and clamps transients to ≤25.8V at 15.5A peak pulse current (10/1000μs waveform), making it suitable for protecting SMPS inputs and DC/DC converter outputs.
For engineers reviewing the SMAJ14C datasheet, SMAJ14C pinout, SMAJ14C application, or SMAJ14C equivalent, key selection criteria include its 14V VWM rating, bidirectional capability (C suffix denotes bidirectional version per documentation), 150°C junction temperature limit, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
Technical Context
The SMAJ14C is a glass-passivated, single-die TVS diode optimized for fast response (<1.0ps rise time from 0V to VBR min) and low leakage (<1μA at VWM). Its junction capacitance is not specified in the provided data, but its clamping performance is characterized under standardized 10/1000μs surge waveforms per R.E.A. definition.
It operates across -55°C to +150°C junction temperature range, supports 40A non-repetitive forward surge (IFSM, 8.3ms half-sine), and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements. The C suffix confirms bidirectional configuration - electrical characteristics apply identically in both directions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 15.6 V / 19.1 V @ 1 mA - Breakdown voltage range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 25.8 V @ 15.5 A - Clamping voltage under 10/1000μs surge; limits downstream IC stress during ESD/EFT events. |
| PPPM | 400 W - Peak pulse power handling capacity; enables protection against high-energy transients like load dump. |
| IR @ VWM | <1 μA - Ultra-low reverse leakage preserves efficiency in low-power standby circuits. |
| TJ max | +150 °C - Enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | DO-214AC (SMA) - Surface-mount outline compatible with automated placement; 0.060 g weight supports lightweight PCB design. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (unidirectional) or symmetric marking (bidirectional C-type). Bidirectional SMAJ14C has no polarity marking; terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals conduct equally during positive or negative surges; no orientation required on PCB. |
| Case | Thermal and mechanical interface | Plastic body provides electrical isolation; thermal path relies on PCB copper area per JEDEC standard layout. |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for automotive Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling), enabling drop-in use in vehicle ECUs. |
| Fast response time | <1.0 ps from 0 V to VBR min - faster than most microcontroller I/O response times, ensuring protection activates before system damage occurs. |
| Moisture sensitivity level 1 | No floor life limitation or baking requirement before reflow - simplifies SMT manufacturing and reduces assembly cost. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive - meets environmental compliance for global OEM shipments without material declaration overhead. |
| 400W peak pulse power | Rated at 10/1000μs waveform - exceeds typical ISO 7637-2 Pulse 5a (load dump) energy requirements for 12V systems. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 12V supply input of BCM against load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp at main power entry point, absorbing up to 400W surge energy. Use Value: Prevents latch-up or destruction of downstream PMICs and microcontrollers during 12V system transients per ISO 7637-2 Pulse 5a. |
Use Scenario: Shields 24V digital input circuitry from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Front-end transient suppressor on optocoupler input side, limiting voltage to safe logic levels. Use Value: Ensures >15.5A surge current is clamped to ≤25.8V, preserving signal integrity and preventing false triggering. |
| LED Driver Power Supply | On-board DC/DC Converter Input |
Use Scenario: Guards constant-current LED driver ICs against switching noise and hot-plug transients. IC Role / Device Role / Timing Role: Standoff-rated protector placed between bulk capacitor and controller IC input. Use Value: Maintains 14V VWM margin above nominal 12V rail while clamping spikes to 25.8V, avoiding regulator shutdown. |
Use Scenario: Secures buck converter input against back-EMF from adjacent motor drivers on shared PCB. IC Role / Device Role / Timing Role: Fast-acting shunt device that diverts surge current away from converter MOSFET gate drivers. Use Value: Leverages <1.0ps response to engage before 100ns-level gate driver propagation delays, preventing shoot-through failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14CA (Taiwan Semiconductor) | Bidirectional variant with identical VWM/VBR/VC specs; same DO-214AC package and 400W rating. | Required where AC-coupled or dual-polarity signal lines need protection (e.g., RS-485 bus). | Select SMAJ14CA only when bidirectional clamping is explicitly needed; SMAJ14C suffices for DC rail protection. |
| SMBJ14C (ON Semiconductor) | Same 14V VWM, but SMB package (DO-214AA) - 2.5mm × 4.2mm vs SMA's 2.8mm × 4.6mm; 600W peak power rating. | Higher power headroom suits higher-energy environments; smaller footprint may ease layout but reduces thermal mass. | Choose SMBJ14C if board space is constrained and 600W margin is required; SMAJ14C offers better thermal dissipation in same-cost footprint. |
Compared with SMAJ14CA, the SMAJ14C offers identical electrical protection in unidirectional configurations with simpler layout (no polarity concern), while SMBJ14C trades larger thermal mass for smaller size and higher peak power - critical for compact, high-surge industrial modules.
Availability
SMAJ14C is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, LED lighting power supplies, and on-board DC/DC converters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMAJ14C 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 MOSFETs since 1979.
The SMAJ series was developed for high-reliability transient suppression in automotive and industrial power systems, emphasizing ISO 7637-2 compliance, moisture resilience, and automated assembly compatibility.
FAQ
What does the 'C' suffix in SMAJ14C indicate?
The 'C' suffix in SMAJ14C denotes a bidirectional configuration - meaning the device provides symmetrical clamping for both positive and negative transients. Unlike unidirectional variants (e.g., SMAJ14), SMAJ14C has no cathode marking and functions identically in either orientation, making it ideal for AC signal lines or floating DC rails where polarity reversal is possible.
Is SMAJ14C compliant with automotive standards?
Yes, SMAJ14C meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b, covering common automotive transient threats including load dump simulation, inductive switching spikes, and capacitive coupling noise. Its 150°C maximum junction temperature and MSL Level 1 rating further support under-hood deployment without derating.
What is the clamping voltage of SMAJ14C under surge conditions?
SMAJ14C clamps to a maximum of 25.8 V when subjected to a 15.5 A peak pulse current with a 10/1000μs waveform. This value is measured at the device terminals and represents the upper voltage limit imposed on protected circuitry during standardized surge events, ensuring downstream components remain within safe operating voltage windows.
Can SMAJ14C replace SMAJ14 in an existing design?
No - SMAJ14 is unidirectional with a cathode band, while SMAJ14C is bidirectional with no polarity marking. Substituting SMAJ14C for SMAJ14 in a unidirectional application introduces unnecessary conduction paths and may compromise protection integrity. Use SMAJ14C only where bidirectional clamping is required and verified in the schematic.
What is the maximum steady-state power dissipation of SMAJ14C?
SMAJ14C has a steady-state power dissipation (PD) rating of 1 W at 25°C ambient. This value applies to continuous DC reverse bias conditions and must be derated linearly above 25°C using the thermal resistance curve in Figure 2 of the datasheet; at 100°C ambient, PD drops to approximately 0.5 W.
SMAJ14C 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:
- 25.8V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- 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)
SMAJ14C FAQ
1.How can I place an order for SMAJ14C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14C 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 SMAJ14C reliable?
The price and inventory of SMAJ14C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14C is usually 5 days.
3.What payment methods are accepted for SMAJ14C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14C?
SMAJ14C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14C 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 SMAJ14C?
For technical support, including SMAJ14C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14C requirements.
6.How does Aetrix verify that SMAJ14C is sourced from the original manufacturer or authorized distributors?
All SMAJ14C 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 SMAJ14C meets industry standards.
7.What is the process for return or replacement of SMAJ14C?
All SMAJ14C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14C, 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 SMAJ14C part is unused and in its original packaging.
Return procedure for SMAJ14C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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