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Diodes Incorporated SMAJ11A-13
- Part No.:
- SMAJ11A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11A-13.pdf
- Description:
- TVS DIODE 11VWM 18.2VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,311
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Product details
Overview
SMAJ11A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 11V reverse standoff voltage (VRWM), 12.2–13.5V breakdown voltage (VBR) at 1mA, 18.2V max clamping voltage (VC) at 22A peak pulse current, and operates from –55°C to +150°C - used in automotive infotainment power inputs and industrial PLC I/O modules.
For engineers reviewing the SMAJ11A-13 datasheet, SMAJ11A-13 pinout, SMAJ11A-13 application, or SMAJ11A-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, 8.3ms surge current capability under JEDEC test conditions, unidirectional polarity requirement, and SMA package thermal derating above 25°C ambient.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast response (<1 ps) to ESD and lightning-induced transients. Its unidirectional configuration provides low-leakage forward conduction path while blocking reverse current until VBR is exceeded.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge) immunity standards when applied with proper PCB layout and series impedance. Clamping performance is validated using 10/1000μs and 8.3ms half-sine waveforms per REA and JEDEC methods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3ms surges up to 22A without failure under defined thermal conditions |
| Reverse Standoff Voltage | 11 V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage | 12.2–13.5 V @ 1mA - guaranteed conduction onset range for reliable overvoltage triggering |
| Max Clamping Voltage | 18.2 V @ 22A - upper limit of voltage seen by downstream circuit during worst-case surge |
| Leakage Current | ≤5 μA @ 11V - ensures minimal power loss and signal integrity in standby operation |
| Operating Temperature | –55°C to +150°C - supports under-hood automotive and industrial control environments |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with automated assembly and 1.0W steady-state dissipation at TL = 75°C |
Pinout & Package
Two-terminal SMA (DO-214AC) package with cathode band marking. Anode and cathode terminals are arranged linearly; polarity must be observed during PCB placement to ensure correct unidirectional clamping direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during clamping | Connected to protected line; conducts surge current toward ground when VC exceeds VBR |
| Cathode | Reference terminal / polarity indicator | Marked end; ties to system ground or higher-potential rail depending on protection topology |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Enables stable VBR and low leakage across temperature and lifetime without hermetic sealing |
| 400W peak pulse rating | Provides robust protection against IEC 61000-4-5 Level 3 (1kV/2Ω) surges on 12V systems |
| Fast response time | Sub-nanosecond turn-on limits voltage overshoot during ESD events (IEC 61000-4-2 ±8kV contact) |
| RoHS-compliant matte tin finish | Ensures solderability per MIL-STD-202 Method 208 and compatibility with lead-free reflow profiles |
Applications
| Automotive Body Control Module (BCM) Power Input | Industrial Ethernet PHY Protection |
|---|---|
Use Scenario: 12V battery-supplied BCM microcontroller power rail exposed to load dump and jump-start transients. IC Role / Device Role: Primary clamping element placed between fuse and LDO input to limit voltage to ≤18.2V during 400A/100ms load dump. Use Value: Prevents LDO overvoltage failure and maintains MCU brown-out reset functionality during ISO 16750-2 transient events. | Use Scenario: RJ45 connector interface on industrial switch with PoE+ (up to 57V) and ESD exposure. IC Role / Device Role: Unidirectional TVS on VDDIO rail of Ethernet PHY IC to clamp induced surges from cable coupling. Use Value: Limits voltage excursion to <18.2V during 10/1000μs surges, preserving PHY ESD immunity without affecting 100BASE-TX signal integrity. |
| Smart Meter AC/DC Converter Output | Medical Sensor Signal Conditioning Input |
Use Scenario: 5V output of isolated flyback converter powering metrology SoC in utility smart meters. IC Role / Device Role: Secondary-side TVS protecting SoC supply pins from transformer-coupled switching noise and surge propagation. Use Value: Maintains <5μA leakage at 5V to avoid metering accuracy drift while clamping spikes to safe levels. | Use Scenario: Analog front-end of patient-connected biosensor with low-noise amplifier and ADC inputs. IC Role / Device Role: Low-capacitance TVS on differential sensor lines to suppress ESD without degrading bandwidth. Use Value: Achieves <100pF typical junction capacitance at 0V bias, minimizing signal attenuation at 10kHz biomedical frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11CA-13 | Bi-directional version; symmetric clamping for AC or floating signal lines | Required where bidirectional transients occur (e.g., RS-485 data lines) | Select only if circuit lacks defined polarity reference or handles AC-coupled signals |
| SMBJ11A-13 | Same electrical specs but SMB (DO-214AA) package; 600W peak power rating | Higher surge margin needed in harsher environments (e.g., railway traction control) | Choose when board space allows larger footprint and 600W surge headroom is required |
Compared with SMAJ11CA-13, the unidirectional SMAJ11A-13 offers lower leakage and tighter clamping for DC rails; versus SMBJ11A-13, it trades 200W peak power for smaller SMA footprint - optimal for space-constrained 12V automotive modules.
Availability
SMAJ11A-13 is available at Aetrix Electronics and suitable for automotive body electronics, industrial Ethernet interfaces, smart meter power supplies, and medical sensor front-ends requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ11A-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression product line, engineered specifically for high-reliability DC power rail and low-speed signal line protection in automotive, industrial, and consumer applications.
FAQ
What is the maximum clamping voltage of SMAJ11A-13 at its rated peak pulse current?
The maximum clamping voltage (VC) is 18.2 V at 22.0 A peak pulse current (Ipp), measured under 8.3 ms single half-sine-wave conditions per JEDEC Std. 28. This defines the highest voltage imposed on protected circuitry during worst-case surge events.
Does SMAJ11A-13 have polarity marking, and how is it identified?
Yes - SMAJ11A-13 is unidirectional and marked with a cathode band (a visible stripe near one end of the SMA package). The banded end is the cathode and must connect to the higher-potential side (e.g., VDD rail) for proper clamping action toward ground.
Can SMAJ11A-13 be used in bidirectional signal lines like RS-485?
No - SMAJ11A-13 is unidirectional and unsuitable for AC or floating bidirectional lines. For RS-485, use SMAJ11CA-13, which has symmetrical breakdown in both directions and no polarity indicator, enabling clamping regardless of signal polarity swing.
What is the thermal derating behavior of SMAJ11A-13 above 25°C ambient?
Peak pulse power derates linearly above 25°C ambient: at 75°C, it retains ~70% of 400W rating (~280W); at 125°C, ~40% (~160W). Derating follows the curve in Figure 1 of DS19005 Rev. 12, based on junction-to-ambient thermal resistance of the SMA package.
SMAJ11A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMAJ)
SMAJ11A-13 FAQ
1.How can I place an order for SMAJ11A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11A-13 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-13 reliable?
The price and inventory of SMAJ11A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ11A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11A-13?
SMAJ11A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11A-13 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-13?
For technical support, including SMAJ11A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11A-13 requirements.
6.How does Aetrix verify that SMAJ11A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ11A-13 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-13 meets industry standards.
7.What is the process for return or replacement of SMAJ11A-13?
All SMAJ11A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11A-13, 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-13 part is unused and in its original packaging.
Return procedure for SMAJ11A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ11A-13 Tags
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