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Taiwan Semiconductor Corporation SMAJ11CA
- Part No.:
- SMAJ11CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CA.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,180
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Product details
Overview
SMAJ11CA from Taiwan Semiconductor is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 11V working stand-off voltage (VWM), 12.2–13.5V breakdown voltage (VBR), and 18.2V maximum clamping voltage (VC) at 22A peak pulse current. It protects DC/DC converters and automotive power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ11CA datasheet, SMAJ11CA pinout, SMAJ11CA application, or SMAJ11CA equivalent, key selection criteria include bidirectional clamping capability, 10/1000μs waveform compliance, moisture sensitivity level 1 handling, RoHS/halogen-free status, and junction temperature range of –55°C to +150°C for under-hood and industrial environments.
Technical Context
The SMAJ11CA uses a glass-passivated silicon junction optimized for fast transient response (<1.0ps rise time from 0V to VBR min) and low leakage (<1μA at VWM). Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating bus applications without polarity constraints.
It delivers 400W peak pulse power (10/1000μs waveform) up to 78V VWM; above that, derated to 300W. Thermal performance is defined by 150°C max junction temperature and 1W steady-state power dissipation, supporting continuous operation in thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse voltage before clamping begins; sets operating margin for 12V nominal systems. |
| VBR min/max | 12.2 V / 13.5 V @ 1 mA - Confirmed breakdown threshold ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 18.2 V @ 22 A - Clamping voltage limits downstream IC stress during 10/1000μs surge; supports IEC 61000-4-5 Level 3 immunity. |
| PPPM | 400 W (10/1000μs) - Peak energy absorption capacity validated per REA-defined waveform for automotive load dump simulation. |
| IR @ VWM | <1 μA - Ultra-low leakage preserves battery life in always-on circuits and avoids false triggering in high-impedance sensing nodes. |
| TJ max | +150 °C - Enables placement near heat sources (e.g., MOSFETs, inductors) in SMPS and motor control modules. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060 g mass; compatible with automated pick-and-place and reflow profiles. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band (bidirectional operation means band denotes common terminal; both ends function identically).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient clamp node | No polarity dependency - connects across protected line and ground (or between differential lines); cathode band marks reference terminal but conduction is identical in both directions. |
| Case | Non-electrical mechanical interface | Thermally conductive but electrically isolated; no internal connection to die - allows mounting on copper pour for thermal relief without shorting. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over lifetime and humidity exposure; eliminates risk of corrosion-induced parameter drift in humid environments. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated protection against real-world automotive transients including battery disconnect spikes and inductive load switching noise. |
| Moisture sensitivity level 1 (J-STD-020) | Zero bake requirement before SMT assembly - reduces manufacturing cost and avoids thermal stress on adjacent components. |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental regulations and enables use in consumer, industrial, and automotive supply chains with strict material declarations. |
| Fast response time <1.0 ps | Clamps before sensitive logic or analog circuitry sustains damage - critical for protecting CAN/LIN transceivers and microcontroller I/O pins. |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed at input filter stage to clamp transients before upstream L-C filtering. Use Value: Withstands 400W pulses per ISO 7637-2 Pulse 5a while maintaining 18.2V clamping - prevents MCU brownout and gate driver latch-up. |
Use Scenario: Safeguarding isolated 24V-to-5V flyback converter inputs in PLC backplanes. IC Role / Device Role / Timing Role: Primary-side transient suppressor across bulk capacitor terminals to absorb reflected surge energy. Use Value: 11V VWM aligns with 24V system derating; 150°C TJ rating supports operation inside sealed enclosures with limited airflow. |
| LED Driver Modules | USB-C Power Delivery Ports |
Use Scenario: Transient suppression on constant-current LED string supplies in streetlight drivers. IC Role / Device Role / Timing Role: Parallel-connected TVS across output terminals to prevent overvoltage damage during hot-plug or cable ESD events. Use Value: Bidirectional operation handles reverse-polarity misconnection; <1μA IR avoids loading precision current-sense resistors. |
Use Scenario: Input-side protection for USB-C PD sink controllers exposed to cable-borne surges. IC Role / Device Role / Timing Role: First-line clamping device between connector and buck controller, referenced to system ground. Use Value: 18.2V VC ensures PD controller (typically rated to 20V abs max) remains within safe operating area during 10/1000μs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A (Taiwan Semiconductor) | Unidirectional; same VWM/VBR/VC specs but asymmetric conduction - requires correct polarity orientation. | Only suitable where circuit topology enforces known polarity (e.g., DC bus with defined ground reference). | Select SMAJ11A only if board layout guarantees consistent anode/cathode orientation and no AC coupling exists. |
| SMBJ11CA (ON Semiconductor) | Same bidirectional function and VWM/VBR/VC ratings, but in larger DO-214AA (SMB) package (higher thermal mass, 6.5mm x 3.5mm vs SMA's 4.6mm x 2.8mm). | Better thermal performance in high-duty-cycle surge environments, but requires PCB footprint revision. | Choose SMBJ11CA when sustained surge repetition or higher ambient temperatures demand greater thermal margin - not a drop-in replacement. |
Compared with SMAJ11CA, SMAJ11A requires strict polarity awareness and offers no advantage in bidirectional systems, while SMBJ11CA provides enhanced thermal robustness at the cost of footprint compatibility - SMAJ11CA remains optimal for space-constrained, polarity-agnostic 12V rail protection.
Availability
SMAJ11CA is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, LED driver modules, and USB-C power delivery ports requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ11CA 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 devices.
The SMAJ series was designed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing ISO 7637-2 compliance, moisture resilience, and surface-mount manufacturability.
FAQ
What does the "CA" suffix indicate in SMAJ11CA?
The "CA" suffix in SMAJ11CA denotes a bidirectional configuration - meaning the device clamps symmetrically in both forward and reverse directions, with no polarity dependency. This differs from the "A"-suffixed unidirectional variants like SMAJ11A, which require correct anode/cathode orientation. SMAJ11CA is ideal for AC-coupled lines or floating buses where voltage polarity may reverse.
Is SMAJ11CA compliant with automotive transient standards?
Yes, SMAJ11CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (switch-off induced), Pulse 2b (switch-on induced), Pulse 3a (capacitive discharge), and Pulse 3b (capacitive discharge with line impedance). Its 400W peak pulse power rating and 18.2V clamping voltage are validated for these waveforms, making it suitable for 12V automotive ECU front-end protection.
What is the maximum clamping voltage of SMAJ11CA and at what current is it specified?
The maximum clamping voltage (VC) of SMAJ11CA is 18.2 V, measured at a peak pulse current (IPPM) of 22 A using the standard 10/1000μs double-exponential waveform. This value ensures downstream components rated for ≤20 V absolute maximum survive transient events without overstress.
Does SMAJ11CA require baking before reflow soldering?
No, SMAJ11CA has a moisture sensitivity level (MSL) of 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH and placed directly into reflow without pre-baking. This simplifies SMT line logistics and eliminates thermal stress risks associated with bake cycles.
How does SMAJ11CA compare to SMAJ11A in terms of circuit design flexibility?
SMAJ11CA offers greater circuit design flexibility than SMAJ11A due to its bidirectional operation - it eliminates the need for polarity-aware layout, supports AC-coupled signal paths, and tolerates reverse-voltage faults. SMAJ11A, being unidirectional, must be oriented correctly and cannot protect against reverse-biased transients without additional components.
SMAJ11CA 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:
- 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)
SMAJ11CA FAQ
1.How can I place an order for SMAJ11CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CA 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 SMAJ11CA reliable?
The price and inventory of SMAJ11CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11CA is usually 5 days.
3.What payment methods are accepted for SMAJ11CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CA?
SMAJ11CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CA 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 SMAJ11CA?
For technical support, including SMAJ11CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CA requirements.
6.How does Aetrix verify that SMAJ11CA is sourced from the original manufacturer or authorized distributors?
All SMAJ11CA 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 SMAJ11CA meets industry standards.
7.What is the process for return or replacement of SMAJ11CA?
All SMAJ11CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CA, 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 SMAJ11CA part is unused and in its original packaging.
Return procedure for SMAJ11CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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