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Vishay General Semiconductor - Diodes Division SMAJ11CA-E3/5A
- Part No.:
- SMAJ11CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CA-E3/5A.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ11CA-E3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features 11 V standoff voltage (VWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA, 400 W peak pulse power (10/1000 μs), and clamps to ≤18.2 V at 22 A peak surge current - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ11CA-E3/5A datasheet, SMAJ11CA-E3/5A pinout, SMAJ11CA-E3/5A application, or SMAJ11CA-E3/5A equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification status, and real-world use cases in ESD- and surge-prone analog front-ends.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VC, and IPPM ratings in forward and reverse directions. Its glass-passivated junction enables fast response (<1 ns) and low incremental surge resistance, critical for protecting MOSFET gates and microcontroller I/O pins against lightning-induced surges and inductive switching spikes.
The device is rated for repetitive 10/1000 μs waveform pulses at 0.01 % duty cycle (400 W up to 78 V; derated to 300 W above), mounted on 5.0 mm × 5.0 mm copper pads. Junction temperature range spans −55 °C to +150 °C, and it meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - maximum continuous reverse stand-off voltage before clamping begins; defines safe operating margin below system rail. |
| VBR (min/max) | 12.2 V / 13.5 V at IT = 1 mA - guaranteed breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | ≤18.2 V at 22 A - clamping voltage limits stress on downstream ICs during 400 W transient surges. |
| PPPM | 400 W (10/1000 μs) - peak pulse power handling capacity for standard lightning/surge immunity testing (IEC 61000-4-5). |
| IFSM | 40 A (8.3 ms half-sine) - surge current rating for unidirectional variants; not applicable to bidirectional SMAJ11CA but confirms robust chip construction. |
| RθJA | 120 °C/W - thermal resistance from junction to ambient; informs PCB copper pad sizing for sustained power dissipation. |
| TJmax | +150 °C - maximum junction temperature supports operation in under-hood automotive and industrial environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads. Meets UL 94 V-0 flammability rating and J-STD-002/JESD 22-B102 solderability standards. Bidirectional variant has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (either polarity) | Acts as cathode during positive transients; functions identically as anode during negative transients due to symmetry. |
| Cathode | Transient current exit (either polarity) | Acts as anode during negative transients; provides symmetrical conduction path for bidirectional clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 400 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 3 (1 kV line-to-line, 2 kV line-to-earth) surge immunity requirements. |
| Fast response time (<1 ns) | Clamps transients before sensitive logic or analog circuitry sustains damage from overvoltage. |
| AEC-Q101 qualified option available | HE3/HM3 suffix variants support automotive-grade reliability for engine control, ADAS sensors, and infotainment I/O. |
| MSL Level 1 moisture sensitivity | Allows standard SMT reflow without baking; compatible with high-volume automated assembly. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and temperature/pressure sensor outputs from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector entry point to shunt surge energy before reaching signal conditioning op-amps or microcontroller ADC inputs. Use Value: Clamps 11 V nominal lines to ≤18.2 V during 22 A transients, preserving ADC reference integrity and preventing latch-up in 3.3 V/5 V MCUs. |
Use Scenario: Safeguarding 4–20 mA current-loop receivers and ±10 V analog inputs in factory-floor PLC modules exposed to motor drive noise. IC Role / Device Role / Timing Role: Placed differential across input terminals to suppress common-mode surges induced by nearby VFD switching. Use Value: Symmetric clamping prevents polarity-dependent failure; 120 °C/W RθJA allows thermal design with minimal copper area on dense I/O boards. |
| Consumer USB Port Protection | Telecom Line Card Surge Guard |
|
Use Scenario: Adding secondary overvoltage protection on USB 2.0 D+/D− lines behind primary ESD arrays in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Standoff voltage (11 V) exceeds USB 3.3 V signaling swing while allowing headroom for VBUS coupling transients. Use Value: 18.2 V clamping prevents damage to USB PHY transceivers during hot-plug ESD or cable discharge events. |
Use Scenario: Front-end protection on POTS or xDSL line interface cards subjected to lightning-induced longitudinal surges per GR-1089-CORE. IC Role / Device Role / Timing Role: Paired with gas discharge tube (GDT) in hybrid protection scheme - TVS handles fast rise-time components; GDT handles high-energy tail. Use Value: 400 W pulse rating and <1 ns response ensure coordination with upstream GDTs without let-through voltage exceeding line codec withstand limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11A-E3/5A | Unidirectional; cathode-marked; same VWM/VBR/VC/PPPM but asymmetric conduction. | Requires polarity-aware layout; suitable only where DC bias or signal direction is fixed (e.g., power rail protection). | Select when protecting unidirectional rails (e.g., 12 V supply) and board space permits orientation-aware placement. |
| SMBJ11CA-E3/52 | Same bidirectional function but in SMB (DO-214AA) package; 600 W PPPM; RθJA = 85 °C/W. | Higher power handling and better thermal performance, but 30 % larger footprint than SMA. | Choose for higher surge immunity margins or elevated ambient temperatures where SMA thermal limits are exceeded. |
Compared with SMAJ11CA-E3/5A, the unidirectional SMAJ11A-E3/5A requires strict polarity alignment and cannot protect AC signals, while the SMBJ11CA-E3/52 offers superior power handling at the cost of PCB area - making SMAJ11CA-E3/5A optimal for space-constrained bidirectional protection at 400 W level.
Availability
SMAJ11CA-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog inputs, consumer USB port protection, and telecom line card surge guard applications requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ11CA-E3/5A 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability transient suppression in automotive, industrial, and communications systems - delivering consistent clamping performance, AEC-Q101 qualification paths, and robust SMT manufacturability.
FAQ
What is the standoff voltage rating of the SMAJ11CA-E3/5A?
The SMAJ11CA-E3/5A has a maximum reverse stand-off voltage (VWM) of 11 V, meaning it remains non-conductive up to this voltage under normal operation. This value ensures compatibility with 12 V nominal systems while providing sufficient margin before clamping initiates. The SMAJ11CA-E3/5A maintains this rating across its full operating temperature range (−55 °C to +150 °C) and is validated per Vishay's 88390 specification document.
Is the SMAJ11CA-E3/5A suitable for automotive applications?
Yes - the base SMAJ11CA-E3/5A is commercial-grade and RoHS-compliant, but Vishay offers AEC-Q101 qualified versions under HE3/HM3 suffixes (e.g., SMAJ11CAHE3_A/I). These variants undergo stress testing per AEC-Q101 including HTRB, HTGB, and temperature cycling, making them suitable for engine control units, body electronics, and ADAS sensor modules. The SMAJ11CA-E3/5A itself is widely used in non-safety-critical automotive subsystems where qualification is not mandated.
How does the bidirectional configuration of SMAJ11CA-E3/5A affect its PCB layout?
The SMAJ11CA-E3/5A has no polarity marking and conducts identically in both directions, eliminating orientation constraints during placement. This simplifies layout for differential or AC-coupled signals (e.g., RS-485, CAN, audio lines) and avoids errors from misaligned cathode bands. Unlike unidirectional variants, the SMAJ11CA-E3/5A requires no attention to anode/cathode routing - reducing design review cycles and assembly defects in high-mix manufacturing.
What is the clamping voltage of SMAJ11CA-E3/5A at its rated peak pulse current?
The SMAJ11CA-E3/5A clamps to a maximum of 18.2 V at its rated peak pulse current (IPPM) of 22 A, measured with a 10/1000 μs waveform. This clamping voltage is guaranteed across all production lots and temperature conditions per Vishay's datasheet (Document Number 88390, Rev. 09-Jan-2024). It directly determines the maximum stress imposed on protected ICs - for example, ensuring 3.3 V or 5 V logic remains within safe absolute maximum ratings during surge events.
Does SMAJ11CA-E3/5A require derating above 25 °C ambient temperature?
Yes - the SMAJ11CA-E3/5A must be derated per Figure 2 in Vishay's 88390 datasheet. Its peak pulse power drops linearly from 400 W at 25 °C to approximately 200 W at 100 °C ambient, based on thermal resistance (RθJA = 120 °C/W) and junction temperature limit (TJmax = 150 °C). Designers must verify that worst-case surge energy falls within the derated PPPM curve when operating in elevated ambient environments such as under-hood automotive or enclosed industrial enclosures.
SMAJ11CA-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- 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-E3/5A FAQ
1.How can I place an order for SMAJ11CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CA-E3/5A 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-E3/5A reliable?
The price and inventory of SMAJ11CA-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ11CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CA-E3/5A?
SMAJ11CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CA-E3/5A 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-E3/5A?
For technical support, including SMAJ11CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ11CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ11CA-E3/5A 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-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ11CA-E3/5A?
All SMAJ11CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CA-E3/5A, 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-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ11CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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