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Taiwan Semiconductor Corporation SMAJ13C
- Part No.:
- SMAJ13C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ13C.pdf
- Description:
- 400W, 16V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:8,378
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Product details
Overview
SMAJ13C from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 13V working stand-off voltage (VWM), 14.4–17.6V breakdown voltage (VBR @ 1mA), and 23.8V maximum clamping voltage (VC) at 16.8A peak pulse current. It delivers fast response (<1.0ps), low leakage (<1µA @ VWM), and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics protection.
For engineers reviewing the SMAJ13C datasheet, SMAJ13C pinout, SMAJ13C application, or SMAJ13C equivalent, this page provides verified electrical parameters, clamping behavior under 10/1000µs surge, DO-214AC mechanical layout guidance, and direct alternatives for overvoltage protection in DC/DC converters, SMPS, and lighting systems.
Technical Context
The SMAJ13C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (14.4–17.6V). Its glass-passivated junction ensures stable breakdown and low leakage (<1µA at 13V), while the 10/1000µs waveform rating confirms 400W peak pulse power capability at TA = 25°C.
It features a single-die configuration in DO-214AC (SMA) package with cathode band polarity marking, matte tin-plated leads compliant with J-STD-002, and moisture sensitivity level 1 per J-STD-020 - enabling robust reflow compatibility and long-term reliability in industrial and automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 13 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold. |
| VBR @ IT=1mA | 14.4–17.6 V - Confirmed avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM=16.8A | 23.8 V - Clamped voltage during 10/1000µs surge; defines worst-case stress on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling per 10/1000µs waveform; supports high-energy transients without failure. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes quiescent power loss in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood or enclosed power supply environments. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with 0.060g mass; compatible with automated pick-and-place and reflow. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case meeting UL 94V-0, matte tin-plated leads, cathode indicated by band marking, polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; carries forward surge current up to 40A (IFSM). |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to higher-potential rail; initiates avalanche conduction when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and low IR drift over time and thermal cycling. |
| Response time <1.0 ps | Clamps ESD and fast transients before sensitive circuitry sustains damage. |
| ISO 7637-2 compliance | Validated against automotive load dump (Pulse 2b), coupled transients (Pulse 1/3a/3b), and switching spikes. |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow; supports standard SMT assembly flow. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU directives for environmentally restricted substances. |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifiers against inductive kickback and line surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input rails or across transformer windings to clamp transient overshoot. Use Value: Limits voltage excursion to ≤23.8V during 10/1000µs surges, preventing gate oxide rupture and rectifier avalanche failure. |
Use Scenario: Input rail protection in point-of-load (POL) converters powering FPGAs, microcontrollers, or sensors. IC Role / Device Role / Timing Role: Standoff-rated clamping device placed upstream of buck controller ICs to absorb coupling noise from adjacent switching stages. Use Value: Maintains 13V system integrity with <1µA leakage, avoiding standby current penalty while delivering 400W surge immunity. |
| Automotive Lighting Module | Industrial Adapter Interface |
Use Scenario: Surge suppression on LED driver inputs subjected to ISO 7637-2 Pulse 2b (load dump) in headlamp control units. IC Role / Device Role / Timing Role: Primary overvoltage guard on 12V supply rail, coordinated with upstream fuse and downstream LDO. Use Value: Withstands 12V system load dump events up to 35V for 400ms while clamping to 23.8V - preserving LED driver IC functionality. |
Use Scenario: AC/DC adapter output stage protection against hot-plug transients and capacitor inrush-induced voltage spikes. IC Role / Device Role / Timing Role: Final-stage TVS on regulated 5V/12V/24V outputs, placed immediately before connector pins. Use Value: Provides bidirectional-compatible clamping margin (via SMAJ13CA variant) and meets IEC/EN 61000-4-5 Level 3 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ13A | Narrower VBR range (14.4–15.9V) and lower VC (21.5V @ 18.6A); same DO-214AC package and 400W rating. | Better clamping performance for precision 13V rail protection where tighter VBR tolerance is required. | Select SMAJ13A when lower clamping voltage and tighter breakdown consistency improve system margin. |
| SMBJ13C | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600W peak power rating (10/1000µs). | Higher power handling suits higher-energy transients; requires PCB layout change due to larger footprint and lead spacing. | Choose SMBJ13C only if system-level surge testing exceeds 400W or thermal derating demands larger thermal mass. |
Compared with SMAJ13C, SMAJ13A offers improved clamping voltage and tighter VBR control for critical 13V rails, while SMBJ13C provides higher surge capacity at the cost of board space - neither is pin-compatible, and both require validation of layout and thermal performance.
Availability
SMAJ13C is available at Aetrix Electronics and suitable for switching mode power supplies, automotive lighting modules, and industrial adapters requiring stable component supply, consistent surge performance, and RoHS-compliant manufacturing.
Supply support for SMAJ13C 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, MOSFETs, and power management devices.
The SMAJ series was designed specifically for high-reliability transient suppression in automotive, industrial, and consumer power systems - emphasizing low clamping, fast response, and AEC-Q200-aligned robustness in compact surface-mount packages.
FAQ
What is the clamping voltage of SMAJ13C and how is it measured?
The SMAJ13C has a maximum clamping voltage (VC) of 23.8 V at 16.8 A peak pulse current, tested using the standardized 10/1000 µs double-exponential surge waveform per Fig. 5 in the datasheet. This value represents the upper limit of voltage seen by protected circuitry during a defined transient event and is guaranteed across temperature and production lot.
Is SMAJ13C unidirectional or bidirectional, and how does that affect circuit placement?
SMAJ13C is a unidirectional TVS diode, indicated by the "C" suffix and cathode band marking. It must be placed with cathode toward the higher-potential rail to clamp reverse transients only. Unlike bidirectional variants (e.g., SMAJ13CA), it does not protect against positive-going surges on grounded lines - correct polarity is mandatory for functional protection.
Does SMAJ13C meet automotive transient standards, and which pulses are validated?
Yes, SMAJ13C meets ISO 7637-2 for automotive applications, with explicit validation against Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (load dump into alternator), and Pulses 3a/3b (capacitive coupling and line impedance effects). This makes it suitable for 12V vehicle subsystems including lighting and body control modules.
What is the maximum steady-state power dissipation for SMAJ13C, and how does it relate to thermal design?
The SMAJ13C has a steady-state power dissipation (PD) rating of 1 W at TA = 25°C, derated linearly above that ambient temperature. This rating applies only to continuous DC or low-frequency reverse bias conditions - not surge events. For reliable operation, PCB copper area and thermal vias must maintain junction temperature below +150°C under worst-case ambient and power dissipation.
Can SMAJ13C be used in place of SMAJ13A, and what are the key trade-offs?
No - SMAJ13C and SMAJ13A are not interchangeable without circuit review. SMAJ13C has a wider VBR range (14.4–17.6 V) and higher clamping voltage (23.8 V), while SMAJ13A offers tighter VBR (14.4–15.9 V) and lower VC (21.5 V). Substituting SMAJ13C for SMAJ13A may reduce system overvoltage margin and increase stress on downstream components.
SMAJ13C 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):
- 13V
- Voltage - Breakdown (Min):
- 14.4V
- Voltage - Clamping (Max) @ Ipp:
- 23.8V
- Current - Peak Pulse (10/1000µs):
- 16.8A
- 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)
SMAJ13C FAQ
1.How can I place an order for SMAJ13C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ13C 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 SMAJ13C reliable?
The price and inventory of SMAJ13C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ13C is usually 5 days.
3.What payment methods are accepted for SMAJ13C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ13C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ13C?
SMAJ13C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ13C 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 SMAJ13C?
For technical support, including SMAJ13C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ13C requirements.
6.How does Aetrix verify that SMAJ13C is sourced from the original manufacturer or authorized distributors?
All SMAJ13C 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 SMAJ13C meets industry standards.
7.What is the process for return or replacement of SMAJ13C?
All SMAJ13C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ13C, 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 SMAJ13C part is unused and in its original packaging.
Return procedure for SMAJ13C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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