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Taiwan Semiconductor Corporation SMAJ11A
- Part No.:
- SMAJ11A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11A.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,184
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Product details
Overview
SMAJ11A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast ESD and surge transients in DC power rails. It features a 11 V working stand-off voltage (VWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤18.2 V at 22.0 A peak impulse current under 10/1000 µs waveform - enabling robust protection in SMPS input stages and DC/DC converters.
For engineers reviewing the SMAJ11A datasheet, SMAJ11A pinout, SMAJ11A application, or SMAJ11A equivalent, key selection criteria include its 400 W peak pulse power rating (10/1000 µs), <1 µA reverse leakage at VWM, 150 °C max junction temperature, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
Technical Context
The SMAJ11A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown behavior and low capacitance. Its clamping response time is typically less than 1.0 ps from 0 V to VBR(min), ensuring sub-nanosecond reaction to ESD events.
It is rated for 400 W peak pulse power at TA = 25 °C with 10/1000 µs waveform (derated above 25 °C per Fig.2), supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and maintains steady-state power dissipation of 1 W - suitable for placement on high-density PCBs without thermal compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 12 V systems. |
| VBR @ IT = 1 mA | 12.2–13.5 V - guaranteed avalanche initiation range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM = 22.0 A | ≤18.2 V - clamped voltage under 10/1000 µs surge; limits downstream IC stress to safe levels. |
| PPPM (10/1000 µs) | 400 W - peak transient energy handling capacity; meets IEC 61000-4-5 Level 4 requirements when properly routed. |
| IR @ VWM | ≤1 µA - ultra-low reverse leakage; avoids parasitic loading on sensitive 12 V bias rails or sensor references. |
| TJ max | 150 °C - maximum junction temperature; supports operation in under-hood automotive or enclosed industrial enclosures. |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with 0.060 g mass and J-STD-002 solderable matte tin leads. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with cathode band marking; polarity-sensitive unidirectional configuration; terminals are matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail; completes clamping path during positive transients. |
| Cathode | Avalanche conduction terminal | Connected to protected line (e.g., 12 V input); conducts when voltage exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift. |
| Fast response time <1.0 ps | Enables effective suppression of nanosecond-scale ESD pulses before downstream logic or analog circuitry is damaged. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validates suitability for automotive 12 V battery-line protection without additional filtering components. |
| Moisture sensitivity level 1 (J-STD-020) | Eliminates bake requirements prior to reflow; supports standard SMT assembly processes without yield loss. |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance mandates for industrial, medical, and consumer end equipment. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protecting 12 V CAN/LIN bus power inputs against load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between fused battery feed and LDO regulator input. Use Value: Limits transient voltage to ≤18.2 V at 22 A, preventing damage to 24 V-tolerant regulators and preserving signal integrity on adjacent data lines. |
Use Scenario: Safeguarding 24 V DC digital input channels from field-wiring induced transients and relay coil flyback. IC Role / Device Role / Timing Role: Primary surge arrestor on front-end protection stage before optocoupler or Schmitt trigger input. Use Value: Withstands 400 W surges while maintaining <1 µA leakage, avoiding false triggering and ensuring stable logic-level detection. |
| LED Driver Power Supply | Medical Infusion Pump DC/DC Stage |
|
Use Scenario: Clamping inrush and switching transients on constant-current LED string supply rails. IC Role / Device Role / Timing Role: Secondary overvoltage protection after bulk capacitor, upstream of buck controller feedback node. Use Value: Fast 1.0 ps response prevents overshoot-induced gate oxide stress on MOSFET drivers during cold-start conditions. |
Use Scenario: Securing isolated 5 V/3.3 V auxiliary rails generated by miniature DC/DC converters inside safety-critical devices. IC Role / Device Role / Timing Role: Final-stage transient suppressor on secondary-side output, meeting IEC 60601-1 creepage/clearance and surge immunity requirements. Use Value: UL 94V-0 molding compound and 150 °C TJ rating support sterilization-cycle thermal stability and long-term operational safety. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11 | Higher clamping voltage (20.1 V vs. 18.2 V at same IPPM); wider VBR range (12.2–14.9 V). | Less stringent voltage limiting in low-margin 12 V systems; higher VC may exceed downstream IC absolute max ratings. | Select SMAJ11A when tighter clamping and lower leakage (<1 µA vs. 1 µA) are required for precision 12 V rail protection. |
| SMBJ11A | Same electrical specs but in larger DO-214AA (SMB) package; 600 W PPPM rating (vs. 400 W). | Requires more PCB area; better thermal mass for repetitive surge duty cycles. | Choose SMBJ11A only if board layout allows larger footprint and higher sustained surge energy is needed beyond single-event 400 W. |
Compared with SMAJ11 and SMBJ11A, the SMAJ11A delivers optimal balance of compact DO-214AC footprint, 18.2 V clamping ceiling, and sub-µA leakage - making it preferred for space-constrained 12 V automotive and industrial control designs where precise voltage limiting is critical.
Availability
SMAJ11A is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, LED lighting power supplies, and medical device DC/DC converters requiring stable component supply across extended production lifecycles.
Supply support for SMAJ11A 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The SMAJ series was developed specifically for high-reliability, surface-mount transient suppression in 12 V and 24 V systems - emphasizing fast response, low leakage, and AEC-Q200-aligned robustness without requiring derating for standard reflow profiles.
FAQ
What is the maximum clamping voltage of SMAJ11A under standard surge conditions?
The SMAJ11A clamps to a maximum of 18.2 V when subjected to a 10/1000 µs waveform with a peak impulse current of 22.0 A. This value is measured per JEDEC standards and guarantees consistent overvoltage limiting for protected circuits - critical for safeguarding 12 V-rated ICs such as microcontrollers and communication transceivers in the SMAJ11A application environment.
Is SMAJ11A unidirectional or bidirectional, and how is polarity identified?
SMAJ11A is a unidirectional TVS diode, intended for use on DC power lines with defined polarity. Polarity is marked by a cathode band on the DO-214AC (SMA) package body - the banded end connects to the protected line (e.g., +12 V), while the anode connects to ground. Bidirectional variants use "CA" suffixes (e.g., SMAJ11CA), which SMAJ11A does not support.
Does SMAJ11A meet automotive surge immunity standards?
Yes, SMAJ11A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for 12 V vehicle electrical systems. Its 400 W peak pulse power rating, fast <1.0 ps response, and stable clamping performance under temperature variation make it suitable for front-end protection in BCMs, infotainment power supplies, and ADAS sensor modules using the SMAJ11A specification set.
What is the reverse leakage current of SMAJ11A at its working voltage?
At its 11 V working stand-off voltage (VWM), the SMAJ11A exhibits a maximum reverse leakage current of 1 µA at 25 °C. This ultra-low IR ensures minimal power loss and avoids interference with high-impedance sensing nodes or reference rails - a key design advantage confirmed in the SMAJ11A electrical specifications table.
Can SMAJ11A be used in place of SMAJ11 in an existing design?
SMAJ11A can replace SMAJ11 in most cases, but requires verification of clamping voltage margin: SMAJ11A clamps at ≤18.2 V versus SMAJ11's ≤20.1 V at identical 22.0 A surge current. If downstream components have tight absolute maximum voltage ratings (e.g., ≤19 V), SMAJ11A provides safer headroom - confirming its value in updated SMAJ11A implementations.
SMAJ11A 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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 22A
- 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)
SMAJ11A FAQ
1.How can I place an order for SMAJ11A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11A 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 SMAJ11A reliable?
The price and inventory of SMAJ11A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11A is usually 5 days.
3.What payment methods are accepted for SMAJ11A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11A?
SMAJ11A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11A 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 SMAJ11A?
For technical support, including SMAJ11A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11A requirements.
6.How does Aetrix verify that SMAJ11A is sourced from the original manufacturer or authorized distributors?
All SMAJ11A 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 SMAJ11A meets industry standards.
7.What is the process for return or replacement of SMAJ11A?
All SMAJ11A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11A, 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 SMAJ11A part is unused and in its original packaging.
Return procedure for SMAJ11A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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