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Taiwan Semiconductor Corporation SMAJ11C
- Part No.:
- SMAJ11C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11C.pdf
- Description:
- 400W, 13.6V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,476
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Product details
Overview
SMAJ11C 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 @ 1mA), and 20.1V maximum clamping voltage (VC) at 19.9A peak pulse current. It protects DC/DC converters and power adapters against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ11C datasheet, SMAJ11C pinout, SMAJ11C application, or SMAJ11C equivalent, this page delivers verified electrical parameters, clamping performance under 10/1000μs waveform, thermal limits (TJ = –55°C to +150°C), RoHS/halogen-free compliance, and real-world use context for automotive and industrial power rail protection.
Technical Context
The SMAJ11C is a single-die, unidirectional TVS diode optimized for fast transient suppression on low-voltage DC rails. Its glass-passivated junction achieves <1.0ps response time from 0 V to VBR min and maintains IR <1μA at VWM = 11V, ensuring minimal standby leakage in always-on systems.
Rated for 400W peak pulse power (10/1000μs waveform), it derates linearly above TA = 25°C per Fig.2 and supports 40A non-repetitive forward surge (8.3ms half-sine). Polarity is marked by cathode band; terminals are matte tin-plated and J-STD-002 solderable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system nominal voltage. |
| VBR @ IT=1mA | 12.2–14.9 V - Breakdown threshold range; ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 20.1 V at 19.9 A - Clamped voltage during 400W transient; defines worst-case stress on downstream ICs during surge. |
| PPPM (10/1000μs) | 400 W - Peak pulse power rating; validates robustness against automotive load dump and inductive switching spikes. |
| IR @ VWM | <1 μA - Reverse leakage at stand-off voltage; enables low-power monitoring circuits without parasitic loading. |
| TJ max | +150 °C - Maximum junction temperature; supports 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, polarity indicated by cathode band. Weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; completes clamping loop during transient events. |
| Cathode | High-side protected node | Connected to protected line (e.g., 12V rail); conducts surge current to ground when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps from 0 V to VBR min - Enables sub-nanosecond reaction to ESD and fast-rising transients. |
| Glass passivated junction | Improved reliability and stable VBR over temperature and life cycle - Reduces parameter drift in harsh environments. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (load dump), and Pulse 3a/3b (capacitive coupling) - Meets automotive EMC requirements out-of-box. |
| Moisture sensitivity level | Level 1 per J-STD-020 - No bake required prior to reflow; simplifies manufacturing handling. |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs from load dump and alternator transients per ISO 7637-2 Pulse 2b. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC/DC converter input stage. Use Value: Limits transient voltage to ≤20.1V, preventing damage to upstream regulators and microcontrollers rated for 24V absolute max. |
Use Scenario: Safeguarding isolated 24V-to-5V DC/DC modules in factory automation controllers. IC Role / Device Role / Timing Role: Standoff protector on primary-side input rail, absorbing coupled noise from adjacent motor drives. Use Value: Maintains <1μA leakage at 11V, avoiding regulation error in precision feedback networks while clamping 400W surges. |
| Consumer Power Adapter Output | LED Driver Supply Line |
Use Scenario: Secondary-side overvoltage suppression in 12V wall adapters exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Final-stage TVS across output terminals, downstream of rectifier and filter cap. Use Value: Clamps 10/1000μs transients to 20.1V within 1ps, preserving USB-PD negotiation ICs and load switches. |
Use Scenario: Surge protection on constant-current LED driver inputs in outdoor signage with long cable runs. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24V input bus, shunting induced spikes before buck controller. Use Value: Withstands 40A 8.3ms forward surge, surviving repeated inrush events from cold-start capacitive loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A | Lower VBR range (12.2–13.5V vs. 12.2–14.9V); tighter tolerance; VC = 18.2V at 22.0A. | Better suited for designs requiring lower clamping voltage and tighter VBR consistency. | Select SMAJ11A when minimizing worst-case clamped voltage is critical and higher IPPM margin is acceptable. |
| P6SMB11CA | Bidirectional variant (CA suffix); same VWM = 11V but symmetric clamping in both polarities; VC = 19.0V @ 21.1A. | Required where AC-coupled or reversible polarity lines need protection (e.g., RS-485 data lines). | Choose P6SMB11CA only if bidirectional clamping is mandated; SMAJ11C offers lower cost and simpler layout for DC-only rails. |
Compared with SMAJ11A and P6SMB11CA, the SMAJ11C provides the highest clamping voltage (20.1V) but widest VBR tolerance-making it optimal for cost-sensitive, unidirectional DC protection where moderate clamping margin suffices.
Availability
SMAJ11C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC/DC converter input stages, and consumer power adapter outputs requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMAJ11C 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, serving global automotive, industrial, and consumer markets since 1979.
The SMAJ series is part of TSC's transient voltage suppressor product line, engineered specifically for high-reliability, surface-mount surge protection in automotive and industrial power systems with stringent AEC-Q200 alignment.
FAQ
What is the clamping voltage of the SMAJ11C under standard test conditions?
The SMAJ11C has a maximum clamping voltage (VC) of 20.1 V at 19.9 A peak pulse current, measured using the standardized 10/1000 μs waveform. This value represents the upper limit of voltage seen by downstream circuitry during a 400W transient event, and is confirmed in the Electrical Specifications table on page 2 of the U2102 datasheet.
Is the SMAJ11C unidirectional or bidirectional, and how is polarity identified?
The SMAJ11C is a unidirectional TVS diode, with polarity indicated by a cathode band on the DO-214AC (SMA) package body. The cathode connects to the protected line (e.g., 12V rail), and the anode connects to ground. Bidirectional variants use the "CA" suffix (e.g., SMAJ11CA), which SMAJ11C does not carry.
Does the SMAJ11C meet automotive transient immunity standards?
Yes, the SMAJ11C meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (load dump), and Pulse 3a/3b (capacitive coupling), as explicitly stated in the FEATURES section of the U2102 datasheet. It is widely deployed in automotive ECUs and body control modules for this reason.
What is the maximum junction temperature rating for the SMAJ11C?
The SMAJ11C has a maximum junction temperature (TJ) rating of +150°C, with an operating range from –55°C to +150°C. This allows reliable operation in under-hood automotive environments and thermally constrained industrial enclosures, provided PCB copper area and ambient conditions support adequate thermal dissipation.
How does the SMAJ11C differ from the SMAJ11A in practical design terms?
The SMAJ11C has a wider VBR range (12.2–14.9 V) versus SMAJ11A (12.2–13.5 V), resulting in higher worst-case clamping voltage (20.1 V vs. 18.2 V). SMAJ11C also exhibits slightly lower IPPM (19.9 A vs. 22.0 A) at its rated PPPM. Designers choose SMAJ11C for cost-sensitive, less voltage-margin-constrained applications where broader VBR tolerance is acceptable.
SMAJ11C 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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ11C FAQ
1.How can I place an order for SMAJ11C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11C 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 SMAJ11C reliable?
The price and inventory of SMAJ11C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11C is usually 5 days.
3.What payment methods are accepted for SMAJ11C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11C?
SMAJ11C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11C 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 SMAJ11C?
For technical support, including SMAJ11C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11C requirements.
6.How does Aetrix verify that SMAJ11C is sourced from the original manufacturer or authorized distributors?
All SMAJ11C 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 SMAJ11C meets industry standards.
7.What is the process for return or replacement of SMAJ11C?
All SMAJ11C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11C, 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 SMAJ11C part is unused and in its original packaging.
Return procedure for SMAJ11C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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