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Vishay General Semiconductor - Diodes Division SMAJ11A-M3/5A
- Part No.:
- SMAJ11A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11A-M3/5A.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,797
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Product details
Overview
SMAJ11A-M3/5A 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-M3/5A datasheet, SMAJ11A-M3/5A pinout, SMAJ11A-M3/5A application, or SMAJ11A-M3/5A equivalent, key selection criteria include unidirectional polarity, 18.2 V clamping performance at 22 A, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification eligibility (via HM3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during overvoltage events, leveraging an avalanche breakdown mechanism to divert surge current away from protected circuitry. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 μA at 11 V), while the SMA package supports high surge robustness without derating up to +125 °C ambient.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive transients) when applied with proper PCB layout. Clamping response time is sub-nanosecond, and incremental surge resistance is minimized to sustain 22 A peak pulse current without thermal runaway under repetitive 0.01% duty cycle conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR min/max | 12.2 V / 13.5 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on margin above VWM. |
| VC @ IPPM | 18.2 V at 22 A - Clamped voltage seen by protected circuit during full-rated 10/1000 μs surge; limits stress on downstream components. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; enables protection against inductive switching spikes and load dump. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at rated stand-off voltage; guarantees minimal standby power loss and signal integrity. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C reflow peak). Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts avalanche current to ground during overvoltage event. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables single-device protection against ISO 7637-2 Pulse 1 (inductive load dump) in 12 V automotive systems. |
| 18.2 V clamping voltage at 22 A | Limits voltage overshoot across protected MOSFET gate-source or IC supply pins during transient events. |
| Glass-passivated junction | Ensures long-term VBR stability and low parameter drift over temperature and lifetime cycling. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT manufacturing flow. |
| AEC-Q101 qualification option | Available with HM3 suffix for automotive-grade reliability validation including HTGB, HTRB, and TCT. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and alternator overshoot. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp surges before they reach LDOs or microcontrollers. Use Value: Limits rail voltage to ≤18.2 V during 22 A transients, preventing damage to 20 V-rated input stages of PMICs and CAN transceivers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector entry point to suppress ±8 kV contact ESD (IEC 61000-4-2) before signal conditioning amplifiers. Use Value: Sub-nanosecond response and <1.0 μA leakage preserve signal fidelity while meeting Class 4 immunity without adding filtering delay. |
| DC-DC Converter Input Protection | Motor Drive Gate Driver Protection |
|
Use Scenario: Safeguarding buck converter inputs against inductive kickback from relay coils or solenoid drivers in HVAC control modules. IC Role / Device Role / Timing Role: TVS placed upstream of input filter capacitor to absorb 400 W energy pulses without degrading efficiency or causing latch-up. Use Value: 120 °C/W RθJA allows direct mounting on PCB with minimal thermal relief, eliminating need for discrete heatsinks in space-constrained designs. |
Use Scenario: Preventing gate oxide rupture in N-channel MOSFET half-bridges due to Miller-induced voltage spikes during high dv/dt switching. IC Role / Device Role / Timing Role: Clamp placed between gate and source to limit VGS excursion during shoot-through or parasitic oscillation. Use Value: 13.5 V max VBR ensures turn-on before 15 V gate driver rails exceed absolute maximum ratings, preserving FET reliability. |
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 | Same electrical specs; RoHS-compliant but not halogen-free; uses matte tin plating per J-STD-002. | Preferred for commercial-grade industrial equipment where halogen content is unrestricted. | Select when cost optimization is prioritized and halogen-free compliance is not required by end-customer specification. |
| SMAJ11AHM3_A/I | Identical TVS characteristics; AEC-Q101 qualified; packaged in 13" tape-and-reel (7500 pcs); HM3 suffix denotes halogen-free + automotive qualification. | Required for automotive OEM Tier-1 BOMs mandating AEC-Q101 and material compliance (e.g., VW 80000, GMW3172). | Choose for automotive production programs needing traceable qualification data, extended temperature validation, and zero-halogen assurance. |
Compared with SMAJ11A-M3/5A, the E3 variant offers identical protection performance at lower cost for non-automotive use, while the HM3_A/I version adds formal automotive qualification and halogen-free assurance - enabling drop-in replacement only when qualification documentation and packaging format align with program requirements.
Availability
SMAJ11A-M3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and DC-DC converter designs requiring stable component supply, halogen-free compliance, and SMT manufacturability.
Supply support for SMAJ11A-M3/5A 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 robust transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where high-energy surge immunity and long-term parametric stability are critical.
FAQ
What is the clamping voltage of SMAJ11A-M3/5A at its rated peak pulse current?
The SMAJ11A-M3/5A exhibits a maximum clamping voltage (VC) of 18.2 V at its rated peak pulse current (IPPM) of 22 A, measured under the standardized 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and is confirmed in Vishay's datasheet Document Number 88390, page 2.
Is SMAJ11A-M3/5A suitable for automotive applications?
SMAJ11A-M3/5A itself is not AEC-Q101 qualified, but it shares identical electrical and thermal specifications with the AEC-Q101-qualified variant SMAJ11AHM3_A/I. The "M3" suffix confirms halogen-free and RoHS compliance, making SMAJ11A-M3/5A appropriate for non-qualification automotive subsystems where formal testing is not mandated - such as infotainment power rails or body control module peripherals.
What is the thermal resistance of SMAJ11A-M3/5A, and how does it affect PCB layout?
The SMAJ11A-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's DO-214AC footprint; reducing pad area increases RθJA and risks thermal saturation during repetitive surges, so adherence to the specified copper area is essential for sustained 400 W pulse handling.
How does the unidirectional configuration of SMAJ11A-M3/5A impact its circuit placement?
The unidirectional configuration of SMAJ11A-M3/5A requires correct polarity orientation: the banded end must connect to the line being protected (e.g., VBUS), and the unbanded end to ground. Reversing polarity renders the device non-functional as a clamp - unlike bidirectional types, it does not conduct in reverse bias, so misplacement leaves circuits fully exposed to negative-going transients.
What is the maximum leakage current of SMAJ11A-M3/5A at its stand-off voltage?
The SMAJ11A-M3/5A specifies a maximum reverse leakage current (ID) of 1.0 μA at its 11 V stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor paths and minimizes quiescent power loss in always-on automotive modules, directly supporting design goals for low-power system architecture.
SMAJ11A-M3/5A 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-M3/5A FAQ
1.How can I place an order for SMAJ11A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11A-M3/5A 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-M3/5A reliable?
The price and inventory of SMAJ11A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ11A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11A-M3/5A?
SMAJ11A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11A-M3/5A 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-M3/5A?
For technical support, including SMAJ11A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11A-M3/5A requirements.
6.How does Aetrix verify that SMAJ11A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ11A-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ11A-M3/5A?
All SMAJ11A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11A-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ11A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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