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Taiwan Semiconductor Corporation SMAJ13
- Part No.:
- SMAJ13
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ13.pdf
- Description:
- 400W, 16V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,560
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Product details
Overview
SMAJ13 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping ESD and surge transients in DC power lines. It features a 13 V working stand-off voltage (VWM), 14.4–17.6 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤23.8 V at 16.8 A peak impulse current under 10/1000 µs waveform, delivering 400 W peak pulse power.
For engineers reviewing the SMAJ13 datasheet, SMAJ13 pinout, SMAJ13 application, or SMAJ13 equivalent, key selection criteria include its unidirectional polarity, 1 µA max reverse leakage at VWM, -55°C to +150°C operating junction temperature, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and suitability for compact board-level protection in automotive and industrial power rails.
Technical Context
The SMAJ13 operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps from 0 V to VBR min) and stable clamping performance. Its DO-214AC package supports automated placement and meets J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
It delivers 400 W peak pulse power per 10/1000 µs waveform up to 78 V VWM; above that, rating drops to 300 W - though SMAJ13 (VWM = 13 V) fully utilizes the 400 W rating. Clamping voltage VC = 23.8 V at IPPM = 16.8 A ensures robust overvoltage protection for 12 V nominal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 13 V - Maximum continuous reverse operating voltage before clamping begins; matches 12 V rail systems with margin. |
| VBR min/max | 14.4 V / 17.6 V at IT = 1 mA - Confirmed avalanche onset range; ensures reliable triggering above normal operating voltage. |
| VC @ IPPM | 23.8 V at 16.8 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress in automotive load-dump scenarios. |
| PPPM | 400 W - Peak pulse power handling per standard 10/1000 µs waveform; sufficient for ISO 7637-2 Pulse 5a (load dump). |
| IR @ VWM | ≤1 µA - Ultra-low reverse leakage at rated stand-off voltage; prevents excessive quiescent current in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | DO-214AC (SMA) - Standard surface-mount outline with cathode band marking; compatible with reflow and wave soldering per J-STD-002. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.060 g. Meets UL 94V-0 flammability and J-STD-020 moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; conducts during forward surge events (e.g., reverse-battery protection). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail); avalanches into low-impedance state when voltage exceeds VBR to shunt surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream circuitry (e.g., MCU I/O or PMIC inputs) can be damaged. |
| ISO 7637-2 compliance | Validated for automotive electrical disturbance immunity including Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling). |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives; suitable for green manufacturing and export-compliant designs. |
Applications
| Automotive Body Control Module (BCM) | Industrial 12 V DC/DC Converter Input |
|---|---|
Use Scenario: Protects microcontroller supply pins and LIN bus transceivers from load dump and jump-start surges in vehicle body electronics. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V rail and chassis ground to clamp transients up to 100 V peak. Use Value: Limits clamped voltage to 23.8 V, keeping protected ICs within absolute maximum ratings during ISO 7637-2 Pulse 5a events. | Use Scenario: Shields primary-side MOSFET gate drivers and controller ICs in isolated flyback converters powered from 12 V industrial buses. IC Role / Device Role / Timing Role: Standoff-rated TVS on input rail absorbs repetitive switching noise and accidental overvoltage spikes. Use Value: 1 µA leakage at 13 V minimizes standby power loss; DO-214AC footprint allows placement near connector entry points. |
| LED Driver Power Input | Point-of-Load (POL) Regulator Protection |
Use Scenario: Guards constant-current LED driver ICs against inductive kickback from relay-controlled lighting circuits. IC Role / Device Role / Timing Role: Fast-acting unidirectional suppressor placed upstream of input capacitors to prevent voltage overshoot at IC VIN pins. Use Value: 400 W peak power rating handles 100 ms surges without degradation; clamping at 23.8 V avoids latch-up in CMOS-based drivers. | Use Scenario: Safeguards buck regulator ICs (e.g., MPQ4572) from back-EMF and hot-swap transients in programmable logic controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V input rail feeding POL modules distributed across PCB. Use Value: DO-214AC package enables high-density layout; -55°C to +150°C TJ range supports operation in sealed, fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ13A | Narrower VBR range (14.4–15.9 V vs. 14.4–17.6 V); tighter 5% tolerance; lower clamping voltage (21.5 V vs. 23.8 V) at same IPPM. | Better suited for precision-clamp designs where margin below downstream IC abs-max is critical. | Select SMAJ13A when tighter VBR control and lower VC are required; SMAJ13 offers broader tolerance for cost-sensitive volume production. |
| SMCJ13A | Same VWM/VBR specs but in larger DO-214AB (SMC) package; higher 1500 W PPPM rating; 2x footprint area. | Used where higher surge energy handling is needed (e.g., main battery feed), not board-edge signal lines. | Choose SMCJ13A only if 1500 W rating is required; SMAJ13 provides optimal size/power balance for space-constrained 12 V rail protection. |
Compared with SMAJ13A, the SMAJ13 offers wider VBR tolerance and slightly higher clamping voltage, simplifying BOM consolidation across varying process lots; versus SMCJ13A, it trades surge capacity for 60% smaller PCB area - ideal for dense automotive ECUs and compact industrial modules.
Availability
SMAJ13 is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converter inputs, LED driver protection, and point-of-load regulator safeguarding requiring stable component supply across extended production lifecycles.
Supply support for SMAJ13 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 components.
The SMAJ series was developed specifically for AEC-Q101-qualified automotive and high-reliability industrial surge protection, emphasizing tight parametric control, robust package integrity, and full ISO 7637-2 compliance out-of-box.
FAQ
What is the polarity configuration of the SMAJ13?
The SMAJ13 is a unidirectional TVS diode, with cathode marked by a band on the DO-214AC package. It conducts in forward bias (anode-to-cathode) and clamps in reverse bias when voltage exceeds VBR. This configuration is optimized for protecting positive-rail systems like 12 V automotive supplies, where the cathode connects to the protected line and anode to ground.
Does the SMAJ13 meet automotive qualification standards?
Yes, the SMAJ13 is designed to meet AEC-Q101 stress test requirements for discrete semiconductors and is validated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity. Its -55°C to +150°C operating junction temperature range and moisture sensitivity level 1 rating further support deployment in under-hood and engine-control applications where thermal and environmental robustness is critical.
What is the clamping voltage of the SMAJ13 under standard surge conditions?
The SMAJ13 clamps to a maximum of 23.8 V when subjected to a 10/1000 µs waveform with a peak impulse current of 16.8 A. This value is measured per JEDEC-standard test conditions and represents the upper limit of voltage seen by downstream circuitry during a defined surge event - ensuring compatibility with 24 V-tolerant ICs and providing safe margin below typical 28 V absolute maximum ratings.
Can the SMAJ13 be used in bidirectional signal-line protection?
No - the SMAJ13 is unidirectional and unsuitable for bidirectional AC or data-line protection. For bidirectional applications such as CAN bus or RS-485, a bipolar variant like SMAJ13CA (with 'CA' suffix) must be selected. The SMAJ13's single-junction construction and cathode-band marking confirm its intended use on DC power rails with defined polarity.
What packaging and reel quantity is offered for the SMAJ13?
The SMAJ13 is supplied in DO-214AC (SMA) package on 7,500-piece tape-and-reel format, compliant with EIA-481 standards. The reel includes moisture barrier bagging per J-STD-020 Level 1 requirements, and lead finish is matte tin per J-STD-002 for reliable solder joint formation using standard reflow profiles.
SMAJ13 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ13 FAQ
1.How can I place an order for SMAJ13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ13 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 SMAJ13 reliable?
The price and inventory of SMAJ13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ13 is usually 5 days.
3.What payment methods are accepted for SMAJ13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ13?
SMAJ13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ13 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 SMAJ13?
For technical support, including SMAJ13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ13 requirements.
6.How does Aetrix verify that SMAJ13 is sourced from the original manufacturer or authorized distributors?
All SMAJ13 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 SMAJ13 meets industry standards.
7.What is the process for return or replacement of SMAJ13?
All SMAJ13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ13, 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 SMAJ13 part is unused and in its original packaging.
Return procedure for SMAJ13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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