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Taiwan Semiconductor Corporation SMAJ11H
- Part No.:
- SMAJ11H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11H.pdf
- Description:
- TVS DIODE 11VWM 20.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,534
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Product details
Overview
SMAJ11H from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 11V working stand-off voltage (VWM), 12.2–14.9V breakdown voltage (VBR), and 20.1V maximum clamping voltage (VC) at 19.9A peak pulse current. It delivers fast response (<1.0ps), low leakage (<1µA @ VWM), and AEC-Q101 qualification for automotive-grade surge protection in DC/DC converters and power supplies.
For engineers reviewing the SMAJ11H datasheet, SMAJ11H pinout, SMAJ11H application, or SMAJ11H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature limits (−55°C to +150°C), moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on high-reliability PCBs.
Technical Context
The SMAJ11H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 12.2–14.9V breakdown range at 1mA test current. Its glass-passivated junction ensures stable VBR tolerance and low leakage, while the DO-214AC package supports thermal dissipation up to 1W steady-state and 400W peak pulse (10/1000μs waveform).
Designed for single-die configuration, it meets ISO 7637-2 immunity requirements for automotive electronics and complies with RoHS and halogen-free standards (IEC 61249-2-21). Polarity is marked by cathode band; forward voltage is 3.5V max at 25A surge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 12.2 V / 14.9 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold tolerance |
| VC @ IPPM | 20.1 V - Clamped voltage across device at 19.9 A peak impulse, limiting downstream circuit stress |
| PPPM | 400 W - Peak pulse power handling capability with 10/1000μs waveform, derated above 25°C |
| IR @ VWM | <1 µA - Reverse leakage current at rated stand-off voltage, minimizing standby power loss |
| TJ max | +150 °C - Maximum junction temperature, enabling operation in under-hood automotive environments |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with MSL 1 rating and matte tin-plated leads |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking polarity; terminals are anode (unmarked end) and cathode (banded end); lead finish is matte tin per J-STD-002; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to system ground or low-side reference | Provides low-impedance path during surge events when reverse-biased; must be routed with minimal inductance |
| Cathode | Current exit point in forward bias; connected to protected line (e.g., 12V rail) | Reverse-biased terminal during overvoltage; clamps transient energy to safe voltage level at protected node |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, humidity, and mechanical shock per stress test requirements |
| Glass passivated junction | Ensures stable electrical parameters over time and environmental exposure, reducing parameter drift in harsh conditions |
| Fast response time <1.0 ps | Enables suppression of ESD and fast transients before sensitive ICs experience overstress |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) immunity waveforms |
| MSL 1 rating | Allows unlimited floor life and reflow without baking, simplifying SMT manufacturing flow |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifier inputs against switching-induced voltage spikes and load dump transients. IC Role / Device Role: Unidirectional TVS placed across input rails or between gate and source to clamp overshoot and prevent latch-up. Use Value: Limits clamping voltage to 20.1 V at 19.9 A, ensuring MOSFETs and controllers remain within safe SOA during 400 W transient events. | Use Scenario: Input rail protection in compact automotive infotainment or ADAS domain controllers where space-constrained DC/DC modules interface with battery-supplied 12 V. IC Role / Device Role: Standoff-rated transient suppressor mounted directly at module input connector to absorb ISO 7637-2 Pulse 1 and 2b surges. Use Value: With VWM = 11 V and VC = 20.1 V, it protects downstream buck regulators without interfering with normal 12 V operation or triggering false shutdowns. |
| Lighting Application | Adapters |
Use Scenario: Surge protection for LED driver ICs and MOSFETs in automotive headlamp or interior lighting modules exposed to load dump and jump-start conditions. IC Role / Device Role: Unidirectional clamping device placed across LED string supply lines or driver IC supply pins. Use Value: Delivers 400 W peak pulse power handling and −55°C to +150°C operation, supporting full automotive temperature range reliability. | Use Scenario: Input-stage protection in wall-mounted AC/DC adapters for industrial sensors and IoT gateways subjected to mains-borne surges and lightning-induced transients. IC Role / Device Role: Primary-side TVS on DC output rail to suppress conducted noise and transient coupling from rectified AC input stage. Use Value: Low IR (<1 µA) prevents standby current drain; DO-214AC footprint enables high-density layout without compromising creepage/clearance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11AH | Narrower VBR range (12.2–13.5 V vs. 12.2–14.9 V); lower clamping voltage (18.2 V vs. 20.1 V) at same IPPM | Better suited for tighter voltage margin designs where lower VC reduces stress on downstream 24 V tolerant ICs | Select SMAJ11AH when clamping voltage headroom is critical and tighter VBR tolerance is required |
| SMBJ11H | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; higher PPPM (600 W) and IFSM (100 A) | Preferred for higher-energy surge environments (e.g., heavy-duty vehicle systems) where thermal mass and surge margin exceed SMAJ11H capability | Choose SMBJ11H when board space allows and 600 W peak pulse rating is needed for enhanced robustness |
Compared with SMAJ11AH, the SMAJ11H offers wider VBR tolerance and slightly higher clamping, making it more forgiving in production variance; versus SMBJ11H, it trades surge margin for smaller footprint and lower cost in space-constrained consumer and light automotive applications.
Availability
SMAJ11H is available at Aetrix Electronics and suitable for automotive power management, industrial DC/DC conversion, and lighting control systems requiring stable component supply and AEC-Q101-compliant surge protection.
Supply support for SMAJ11H 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 automotive-qualified components.
The SMAJ series is part of TSC's AEC-Q101-qualified transient suppression portfolio, designed specifically for robust, high-reliability protection in automotive power electronics and industrial power supplies.
FAQ
What is the clamping voltage of SMAJ11H at its rated peak pulse current?
The SMAJ11H has a maximum clamping voltage (VC) of 20.1 V at 19.9 A peak impulse current (IPPM), measured under the standard 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuits during transient events and is confirmed in the Electrical Specifications table on page 2 of the official TSC datasheet revision A2102.
Is SMAJ11H unidirectional or bidirectional, and how is polarity identified?
SMAJ11H is a unidirectional TVS diode, intended for DC line protection where polarity is fixed. Polarity is identified by a cathode band on the DO-214AC (SMA) package body - the banded end is the cathode, connected to the protected line, while the unmarked end is the anode, tied to ground or return path.
Does SMAJ11H meet automotive qualification standards?
Yes, SMAJ11H is AEC-Q101 qualified and meets ISO 7637-2 immunity requirements for Pulse 1, 2a, 2b, 3a, and 3b. It also complies with J-STD-020 moisture sensitivity level 1 and JESD201 Class 2 whisker resistance, confirming suitability for automotive under-hood and chassis-mounted applications.
What is the maximum steady-state power dissipation for SMAJ11H?
The SMAJ11H has a maximum steady-state power dissipation (PD) of 1 W at TA = 25°C, as specified in the Absolute Maximum Ratings table. Derating applies above 25°C per Figure 2 in the datasheet, with zero power capability at +150°C junction temperature.
Can SMAJ11H be used in bidirectional signal line protection?
No - SMAJ11H is unidirectional only. For bidirectional protection, TSC specifies devices with "CH" or "CAH" suffixes (e.g., SMAJ11CH), which feature symmetrical breakdown in both directions. Using SMAJ11H on AC or reversible signal lines risks forward conduction and failure during negative half-cycles.
SMAJ11H 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:
- 20.1V
- Current - Peak Pulse (10/1000µs):
- 19.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ11H FAQ
1.How can I place an order for SMAJ11H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11H 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 SMAJ11H reliable?
The price and inventory of SMAJ11H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11H is usually 5 days.
3.What payment methods are accepted for SMAJ11H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11H?
SMAJ11H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11H 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 SMAJ11H?
For technical support, including SMAJ11H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11H requirements.
6.How does Aetrix verify that SMAJ11H is sourced from the original manufacturer or authorized distributors?
All SMAJ11H 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 SMAJ11H meets industry standards.
7.What is the process for return or replacement of SMAJ11H?
All SMAJ11H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11H, 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 SMAJ11H part is unused and in its original packaging.
Return procedure for SMAJ11H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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