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Taiwan Semiconductor Corporation SMAJ13CA
- Part No.:
- SMAJ13CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ13CA.pdf
- Description:
- TVS DIODE 13VWM 21.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,528
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Product details
Overview
SMAJ13CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 13 V working stand-off voltage (VWM), 14.4–15.9 V breakdown voltage (VBR), 21.5 V maximum clamping voltage (VC) at 18.6 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform.
For engineers reviewing the SMAJ13CA datasheet, SMAJ13CA pinout, SMAJ13CA application, or SMAJ13CA equivalent, this device is selected for automotive load-dump immunity, industrial DC/DC converter input protection, and IEC 61000-4-5 surge suppression where low clamping voltage and fast sub-1 ps response are critical.
Technical Context
The SMAJ13CA employs a glass-passivated silicon junction optimized for bidirectional transient suppression, with symmetrical electrical characteristics in both polarities. Its clamping behavior is defined by a 10/1000 µs standard surge waveform, and it meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b for automotive electronics.
Thermal performance is rated for continuous operation from –55 °C to +150 °C junction temperature, with steady-state power dissipation of 1 W and peak forward surge current capability of 40 A (8.3 ms half-sine). Moisture sensitivity is Level 1 per J-STD-020, supporting standard reflow assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 13 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC rail margin. |
| VBR min/max | 14.4 V / 15.9 V @ 1 mA - Verified breakdown threshold range ensures consistent turn-on across production lots. |
| VC @ IPPM | 21.5 V @ 18.6 A - Clamping voltage under full 400 W surge; limits downstream IC stress during transients. |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance circuits. |
| PPPM | 400 W (10/1000 µs) - Peak surge power handling capacity compliant with IEC 61000-4-5 and ISO 7637-2. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and thermally constrained PCB layouts. |
| Package | DO-214AC (SMA) - Surface-mount outline with 0.060 g mass, UL 94V-0 molding, and matte tin-plated leads. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; dual axial terminals-no polarity distinction for bidirectional operation; lead finish meets J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as anode or cathode depending on transient polarity; no dedicated pin assignment required. |
| Cathode band (marking) | Reference orientation indicator | Visible band denotes terminal 1 per JEDEC DO-214AC; used for visual alignment-not functional polarity in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage over temperature and lifetime; eliminates passivation-related drift in harsh environments. |
| Sub-1 ps response time | Clamps transients before sensitive logic or analog circuitry can be damaged-critical for CAN, LIN, and sensor interfaces. |
| ISO 7637-2 compliance | Validated for automotive load dump (Pulse 2b), coupled surges (Pulse 1/3b), and supply line transients without external filtering. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS directives-enables use in green automotive and industrial supply chains. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceivers from battery line transients during ignition, alternator load dump, and relay switching. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to limit voltage excursions to ≤21.5 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic while maintaining signal integrity during 100 V/100 ms pulses. | Use Scenario: Shields primary-side controller ICs and gate drivers in isolated 24 V–48 V input DC/DC converters from ESD and surge events. IC Role / Device Role / Timing Role: Fast-acting shunt clamp that diverts >18 A surge current away from PWM controller and MOSFET gate drivers. Use Value: Enables reliable operation under IEC 61000-4-5 Level 4 (4 kV line-earth) without derating or additional RC snubbing. |
| LED Driver Power Supply | Smart Meter Power Input Stage |
Use Scenario: Safeguards constant-current LED driver ICs against induced surges from nearby AC mains switching or lightning-induced coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between bulk capacitor and bridge rectifier output to clamp repetitive line transients. Use Value: Maintains VWM = 13 V margin above nominal 12 V DC bus, ensuring zero false triggering during normal operation. | Use Scenario: Provides primary-level surge immunity on 220 VAC-derived 12 V auxiliary supply feeding metrology SoCs and communication modules. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of LDO regulators and isolated RS-485 transceivers. Use Value: Limits clamped voltage to 21.5 V-well below absolute maximum ratings of 24 V-tolerant power management ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ13CA | Identical electrical specs, same DO-214AC package, identical marking and thermal derating curves. | No functional or layout change required; validated for same ISO 7637-2 test profiles. | Select when dual-sourcing or qualifying alternate supply chain with identical qualification data. |
| Vishay SMAJ13CA-E3/5AT | Same VWM, VBR, VC, and PPPM; differs in moisture sensitivity level (MSL 1 vs MSL 2a) and tape/reel packaging specification. | Compatible in all circuit roles but requires humidity bake-out if stored >1 year per J-STD-020. | Choose for high-volume automated assembly where Vishay's reel logistics align with production planning. |
Compared with Littelfuse and Vishay alternatives, SMAJ13CA offers identical clamping performance and automotive qualification, but Taiwan Semiconductor's version provides tighter VBR tolerance (14.4–15.9 V vs ±5 % typical) and guaranteed MSL 1 handling-reducing process risk in humid climate manufacturing.
Availability
SMAJ13CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, LED lighting power supplies, and smart meter auxiliary power stages requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ13CA 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, and rectifiers for automotive, industrial, and consumer markets.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive ECUs and industrial power systems, emphasizing low clamping voltage, ISO 7637-2 compliance, and robust thermal performance in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of SMAJ13CA under a 10/1000 µs surge?
The SMAJ13CA has a maximum clamping voltage (VC) of 21.5 V when subjected to its rated peak pulse current of 18.6 A, defined by the 10/1000 µs waveform. This value is measured per the standard test condition in the Taiwan Semiconductor datasheet and ensures downstream components see limited overvoltage stress during surge events. The SMAJ13CA maintains this clamping performance across its full operating temperature range.
Is SMAJ13CA unidirectional or bidirectional, and how is polarity marked?
SMAJ13CA is a bidirectional TVS diode-the "CA" suffix explicitly denotes symmetrical breakdown and clamping in both directions. Unlike unidirectional variants (e.g., SMAJ13A), it has no functional polarity; the cathode band on the DO-214AC package serves only as a mechanical orientation marker per JEDEC standards and does not indicate electrical polarity. This makes SMAJ13CA ideal for AC-coupled or floating DC lines where transient direction is unpredictable.
Does SMAJ13CA meet automotive transient immunity standards?
Yes, SMAJ13CA meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply line inductive spike), Pulse 3a (capacitive coupled burst), and Pulse 3b (inductive coupled burst). These qualifications are explicitly stated in the Taiwan Semiconductor datasheet and verified via standardized test waveforms-making SMAJ13CA suitable for direct integration into automotive body control modules, infotainment power supplies, and ADAS sensor interfaces without additional filtering.
What is the leakage current specification for SMAJ13CA at its working voltage?
At its rated working stand-off voltage (VWM) of 13 V, the SMAJ13CA exhibits a maximum reverse leakage current (IR) of 1 µA at 25 °C. This ultra-low leakage is confirmed in the electrical specifications table and remains below 5 µA up to +125 °C-ensuring minimal power loss in battery-powered systems and avoiding false triggering in high-impedance monitoring circuits. The SMAJ13CA achieves this via glass-passivated junction technology.
Can SMAJ13CA be used in place of SMAJ13A in a design?
No-SMAJ13CA and SMAJ13A are not interchangeable without circuit review. SMAJ13A is unidirectional (anode-cathode asymmetry), while SMAJ13CA is bidirectional (symmetrical conduction). Substituting SMAJ13CA for SMAJ13A may cause unintended conduction in DC-biased rails. Conversely, replacing SMAJ13CA with SMAJ13A removes protection against negative transients. Always verify polarity requirements and transient directionality before substitution; the SMAJ13CA must be used where bidirectional clamping is specified.
SMAJ13CA 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:
- 21.5V
- Current - Peak Pulse (10/1000µs):
- 18.6A
- 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)
SMAJ13CA FAQ
1.How can I place an order for SMAJ13CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ13CA 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 SMAJ13CA reliable?
The price and inventory of SMAJ13CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ13CA is usually 5 days.
3.What payment methods are accepted for SMAJ13CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ13CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ13CA?
SMAJ13CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ13CA 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 SMAJ13CA?
For technical support, including SMAJ13CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ13CA requirements.
6.How does Aetrix verify that SMAJ13CA is sourced from the original manufacturer or authorized distributors?
All SMAJ13CA 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 SMAJ13CA meets industry standards.
7.What is the process for return or replacement of SMAJ13CA?
All SMAJ13CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ13CA, 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 SMAJ13CA part is unused and in its original packaging.
Return procedure for SMAJ13CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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