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Vishay General Semiconductor - Diodes Division SMAJ11AHM3_A/I
- Part No.:
- SMAJ11AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11AHM3_A/I.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,009
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Product details
Overview
SMAJ11AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising 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 control systems.
For engineers reviewing the SMAJ11AHM3_A/I datasheet, SMAJ11AHM3_A/I pinout, SMAJ11AHM3_A/I application, or SMAJ11AHM3_A/I equivalent, this device delivers verified AEC-Q101 qualification, halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for automotive-grade board-level ESD and surge protection design validation.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping protector: it remains high-impedance below VWM = 11 V, then rapidly avalanches above VBR = 12.2–13.5 V to limit transient energy. Its low incremental surge resistance and sub-nanosecond response time enable effective suppression of EFT, lightning-induced surges, and inductive switching spikes.
Thermally, it supports operation from −55 °C to +150 °C junction temperature, with RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W. The SMA package enables automated placement and meets UL 94 V-0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin. |
| VBR @ IT = 1 mA | 12.2–13.5 V - Measured breakdown range confirming reliable avalanche initiation under standardized test current. |
| VC @ IPPM = 22 A | 18.2 V - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum overvoltage exposure. |
| PPPM | 400 W - Peak pulse power handling capability with 10/1000 μs waveform; validates robustness against IEC 61000-4-5 surges. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports inrush and fault-current resilience. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with cathode band marking; compatible with standard SMT reflow profiles (peak 260 °C). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side connection | Connected to ground or low-voltage rail in unidirectional clamp configuration; enables current flow during positive transients. |
| Cathode | Reverse-biased terminal / high-side connection | Connected to protected line (e.g., 12 V supply or signal); avalanche conduction occurs when line voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress-test requirements. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for EU and global OEM supply chains without compromising thermal or electrical performance. |
| 400 W peak pulse power (10/1000 μs) | Provides certified surge immunity per IEC 61000-4-5 Level 3 (1 kV source impedance) on 12 V systems. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow assembly without baking or special handling protocols. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage stress on downstream silicon - critical for protecting 13.5 V-rated microcontrollers and CAN transceivers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump and alternator surge events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp transients exceeding 13.5 V. Use Value: Limits peak voltage to ≤18.2 V during 22 A surge, preventing latch-up or gate oxide damage in MCU power domains. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential signal pair or single-ended output to ground. Use Value: Sub-ns response ensures clamping before sensitive ADC input stages experience overvoltage beyond absolute maximum ratings. |
| Consumer USB Port Surge Suppression | Telecom Line Card Transient Protection |
|
Use Scenario: Adding secondary surge protection on VBUS line of USB 2.0 host ports in set-top boxes and docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB power switch to absorb hot-plug and ESD pulses. Use Value: 11 V VWM allows normal 5 V operation while clamping 8 kV contact ESD to <20 V - preserving USB PHY integrity. |
Use Scenario: Safeguarding Ethernet PHY or RS-485 transceivers on telecom base station line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on data line, coordinated with GDT or polymer PTC for multi-stage protection. Use Value: 400 W rating sustains multiple 10/1000 μs surges up to 1 kV without degradation - validated per GR-1089-CORE. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ11AHE3_A/I | Same electrical specs, but RoHS-compliant without halogen restriction; higher ID leakage (≤1 μA vs. ≤1 μA - identical spec). | Approved for commercial/industrial use where halogen-free requirement is not mandated. | Select when cost-sensitive designs prioritize standard RoHS over halogen-free compliance. |
| SMAJ11A-M3/5A | Identical TVS parameters; differs only in packaging format (13" reel, 7500 pcs) and base P/N suffix convention. | No functional difference; suited for high-volume SMT production lines using large reels. | Choose for automated pick-and-place lines requiring bulk tape-and-reel delivery with halogen-free assurance. |
Compared with SMAJ11AHM3_A/I, the HE3 variant offers identical protection performance without halogen-free certification, while the M3/5A version provides the same AEC-Q101-qualified device in a different reel size - enabling flexibility in procurement and assembly logistics without compromising surge immunity or thermal reliability.
Availability
SMAJ11AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and telecom line card surge suppression requiring stable component supply across extended product lifecycles.
Supply support for SMAJ11AHM3_A/I 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, and protection devices with emphasis on reliability, automotive qualification, and application-specific performance.
The SMAJ series was engineered specifically for board-level transient suppression in harsh environments - delivering AEC-Q101-qualified, high-power TVS performance in compact surface-mount packages for automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMAJ11AHM3_A/I at its rated peak pulse current?
The SMAJ11AHM3_A/I has a maximum clamping voltage (VC) of 18.2 V when subjected to its rated peak pulse current (IPPM) of 22 A with a 10/1000 μs waveform. This value is measured per JEDEC standards and ensures predictable overvoltage limiting for downstream components such as microcontrollers or communication ICs in the protected circuit.
Is SMAJ11AHM3_A/I qualified for automotive applications?
Yes, SMAJ11AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet revision 09-Jan-2024. This qualification covers stress tests including HTGB, AC/DC life test, and temperature cycling - validating its suitability for under-hood and chassis-mounted automotive electronics.
What does the "HM3" suffix indicate in SMAJ11AHM3_A/I?
The "HM3" suffix in SMAJ11AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from "HE3" (RoHS only) and "E3/M3" (commercial grade), confirming compliance with automotive environmental and reliability standards without brominated flame retardants.
Can SMAJ11AHM3_A/I be used in bidirectional configurations?
No - SMAJ11AHM3_A/I is a unidirectional TVS diode, identified by the "A" (not "CA") suffix and cathode band marking. For bidirectional operation, Vishay specifies parts like SMAJ11CA; using SMAJ11AHM3_A/I in reverse-biased AC applications would result in forward conduction and failure.
What is the thermal resistance from junction to ambient for SMAJ11AHM3_A/I?
The typical junction-to-ambient thermal resistance (RθJA) of SMAJ11AHM3_A/I is 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard PCB layout per Vishay's recommended pad dimensions and is critical for calculating steady-state power derating above 25 °C ambient.
SMAJ11AHM3_A/I 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ11AHM3_A/I FAQ
1.How can I place an order for SMAJ11AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11AHM3_A/I 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 SMAJ11AHM3_A/I reliable?
The price and inventory of SMAJ11AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ11AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11AHM3_A/I?
SMAJ11AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11AHM3_A/I 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 SMAJ11AHM3_A/I?
For technical support, including SMAJ11AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ11AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ11AHM3_A/I 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 SMAJ11AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ11AHM3_A/I?
All SMAJ11AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11AHM3_A/I, 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 SMAJ11AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ11AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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