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Vishay General Semiconductor - Diodes Division SMAJ11A-E3/5A
- Part No.:
- SMAJ11A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11A-E3/5A.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ11A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 11 V stand-off voltage (VWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA, 18.2 V maximum clamping voltage (VC) at 22 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ11A-E3/5A datasheet, SMAJ11A-E3/5A pinout, SMAJ11A-E3/5A application, or SMAJ11A-E3/5A equivalent, key selection criteria include unidirectional polarity, 1.0 μA max reverse leakage at VWM, 150 °C max junction temperature, and AEC-Q101 qualification availability via HE3 suffix variants - critical for automotive-grade surge protection design validation.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM (11 V) and rapidly transitions to low-impedance conduction above VBR (12.2–13.5 V), limiting transient overvoltage to ≤18.2 V at 22 A. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns).
The SMAJ11A-E3/5A uses a single P-N junction structure with cathode band marking, optimized for automated SMT placement on 0.2" × 0.2" copper pads. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting reliable operation up to 150 °C junction temperature under defined PCB layout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 11 V - Maximum continuous reverse voltage before significant leakage; defines operating margin for 12 V nominal systems. |
| VBR (Breakdown Voltage) | 12.2–13.5 V at 1 mA - Confirmed breakdown range ensuring reliable triggering during transients without premature conduction. |
| VC (Clamping Voltage) | 18.2 V at IPPM = 22 A - Peak voltage seen by protected circuit during 10/1000 μs surge; enables safe margin for 15 V logic or 12 V power rails. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability per 10/1000 μs waveform; derates to 300 W above 78 V but fully applicable at 11 V rating. |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - Minimal standby current draw; preserves battery life and avoids false triggering in low-power sensor nodes. |
| TJ max. | 150 °C - Maximum junction temperature rating enabling use in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 0.208" length, 0.157" width, and matte tin-plated leads compliant with J-STD-002 solderability. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94 V-0 flammability rating; cathode indicated by a band on the body; anode and cathode terminals are axially aligned along the long dimension.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal for forward conduction path | Connected to system ground or lower-potential rail in unidirectional clamp configuration; enables surge current return path. |
| Cathode | Negative terminal; marked with band | Connected to protected line (e.g., 12 V supply or signal); conducts during reverse transient to clamp voltage to VC. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges in 12 V automotive subsystems. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., inductive switch-off), improving clamping precision. |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage performance across temperature and humidity stress conditions. |
| MSL Level 1 (J-STD-020), 260 °C peak reflow | Supports standard lead-free reflow profiles without moisture-related popcorning or delamination risk. |
| AEC-Q101 qualified option available | HE3/HM3 suffix variants meet automotive reliability requirements including HTGB, TCT, and ESD testing per AEC specification. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V power inputs of body control modules (BCM), lighting drivers, and infotainment head units from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power rail and chassis ground to shunt surge current away from downstream regulators and microcontrollers. Use Value: Limits transient voltage to ≤18.2 V, preserving integrity of 15 V-rated DC-DC converters and preventing latch-up in 3.3 V/5 V logic supplies. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) and digital I/O (CAN, LIN) of pressure, temperature, and position sensors in factory automation equipment. IC Role / Device Role / Timing Role: Point-of-entry TVS on sensor PCB edge connector to absorb ESD (IEC 61000-4-2 ±8 kV contact) and fast transients (IEC 61000-4-4 ±2 kV). Use Value: Sub-1 ns response time and ≤1.0 μA leakage ensure signal fidelity and zero impact on loop accuracy or communication timing margins. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeding Protection |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for laptops and monitors, guarding against transformer saturation or controller failure-induced 12–19 V spikes. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across bulk capacitor output to clamp fault voltages before they reach USB-PD controllers or display interface ICs. Use Value: 11 V VWM provides 10 % margin above nominal 12 V output while 18.2 V VC prevents damage to 20 V-rated MOSFETs and gate drivers. |
Use Scenario: Surge protection on -48 V DC feeding lines in telecom base station remote radio units (RRUs), exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Unidirectional TVS installed between feed line and local ground plane to divert common-mode surges induced on twisted-pair or coaxial feeds. Use Value: 400 W PPPM rating supports repeated exposure to Telcordia GR-1089 Class B surges without degradation, maintaining system uptime. |
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-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package; same thermal and clamping performance. | No functional difference; selected when halogen-free material compliance is required for end-product environmental certification. | Choose SMAJ11A-M3/5A for EU EcoDesign or Japan J-Moss compliance where brominated flame retardants must be avoided. |
| SMAJ11CA-E3/5A | Bidirectional version with symmetric 12.2–13.5 V VBR in both polarities; 1.0 μA ID at ±11 V; same PPPM and VC ratings. | Used where AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus) require protection without polarity assumptions. | Select SMAJ11CA-E3/5A only when protecting bidirectional data lines; not interchangeable with SMAJ11A-E3/5A due to polarity and circuit topology mismatch. |
Compared with SMAJ11A-E3/5A, the M3 variant offers identical protection performance with halogen-free construction, while the CA variant changes fundamental polarity behavior - making it unsuitable as a drop-in replacement but essential for AC or differential signal protection where reverse conduction must also be clamped.
Availability
SMAJ11A-E3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and consumer power adapter designs requiring stable component supply, consistent RoHS compliance, and traceable manufacturing origin.
Supply support for SMAJ11A-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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against ISO 7637, IEC 61000-4-5, and ESD events is mandatory.
FAQ
What is the clamping voltage of SMAJ11A-E3/5A at its rated peak pulse current?
The SMAJ11A-E3/5A has a maximum clamping voltage (VC) of 18.2 V at its specified peak pulse current (IPPM) of 22 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuits during transient events. The SMAJ11A-E3/5A maintains this clamping performance consistently due to its glass-passivated junction and low incremental surge resistance.
Is SMAJ11A-E3/5A suitable for automotive applications?
SMAJ11A-E3/5A itself is commercial-grade, but Vishay offers AEC-Q101 qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ11AHE3_A/I). These variants undergo extended reliability testing including temperature cycling, high-temperature reverse bias, and ESD qualification per AEC-Q101. For automotive use, specify the HE3 or HM3 variant - the SMAJ11A-E3/5A should only be used in non-safety-critical, non-automotive contexts unless explicitly validated for the target environment.
How does the standoff voltage (VWM) of SMAJ11A-E3/5A relate to system voltage selection?
The 11 V standoff voltage (VWM) of SMAJ11A-E3/5A is selected to provide ≥10 % margin above nominal 12 V systems while remaining below the 12.2 V minimum breakdown threshold, ensuring no conduction during normal operation. This allows the SMAJ11A-E3/5A to remain inert during startup, load transients, and ripple - only activating during overvoltage events exceeding VBR. Designers use this VWM to avoid false triggering while preserving headroom for worst-case supply tolerances.
What is the thermal resistance of SMAJ11A-E3/5A, and how does it affect PCB layout?
The SMAJ11A-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W, measured on 0.2" × 0.2" copper pads per terminal. To maintain safe junction temperatures under repetitive surge conditions, PCB layout must replicate this pad area and use internal ground planes for heat spreading. Reducing pad size increases RθJA, risking thermal runaway during sustained surge duty cycles - the SMAJ11A-E3/5A's performance depends directly on adherence to Vishay's recommended footprint.
Can SMAJ11A-E3/5A be used in place of SMAJ11CA-E3/5A?
No - SMAJ11A-E3/5A is unidirectional and only clamps reverse-polarity transients, whereas SMAJ11CA-E3/5A is bidirectional and clamps surges of either polarity. Substituting SMAJ11A-E3/5A for SMAJ11CA-E3/5A on AC-coupled or differential lines (e.g., RS-485, CAN) will leave positive-going transients unprotected and may cause catastrophic failure. The SMAJ11A-E3/5A and SMAJ11CA-E3/5A serve distinct circuit roles and are not functionally interchangeable without redesigning the protection topology.
SMAJ11A-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:
- 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:
- 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)
SMAJ11A-E3/5A FAQ
1.How can I place an order for SMAJ11A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11A-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 SMAJ11A-E3/5A reliable?
The price and inventory of SMAJ11A-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 SMAJ11A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ11A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11A-E3/5A?
SMAJ11A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11A-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 SMAJ11A-E3/5A?
For technical support, including SMAJ11A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11A-E3/5A requirements.
6.How does Aetrix verify that SMAJ11A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ11A-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 SMAJ11A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ11A-E3/5A?
All SMAJ11A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11A-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 SMAJ11A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ11A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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