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Vishay General Semiconductor - Diodes Division SMAJ11AHM3/I
- Part No.:
- SMAJ11AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11AHM3/I.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,076
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Product details
Overview
SMAJ11AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 11 V standoff voltage (VWM), 12.2–13.5 V breakdown voltage (VBR) at 1 mA, and clamps transients up to 18.2 V at 22 A peak pulse current (IPPM), with 400 W peak pulse power rating (10/1000 μs waveform). It is widely deployed on power rails and signal lines of automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ11AHM3/I datasheet, SMAJ11AHM3/I pinout, SMAJ11AHM3/I application, or SMAJ11AHM3/I equivalent, this page delivers verified electrical parameters, thermal behavior, AEC-Q101 qualification status, halogen-free RoHS compliance, and real-world protection use cases - all critical for ESD/surge hardening in automotive-grade designs.
Technical Context
This unidirectional TVS operates as a clamping device: under normal conditions it presents high impedance (>1 MΩ leakage at 11 V), but triggers rapidly (<1 ns response) when reverse voltage exceeds VBR, diverting surge energy to ground while limiting downstream voltage to ≤18.2 V. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance.
Thermally, it exhibits RθJA = 120 °C/W (on standard 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - validated for automotive underhood and body-control module applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 11 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 12.2–13.5 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable triggering across temperature and unit variation. |
| VC (Clamping Voltage) | 18.2 V at IPPM = 22 A (10/1000 μs) - Maximum voltage seen by protected circuit during worst-case surge; directly limits stress on downstream ICs. |
| PPPM (Peak Pulse Power) | 400 W - Sustains 10/1000 μs transients without degradation; derates to 300 W above 78 V per spec. |
| IFSM (Surge Current) | 40 A (8.3 ms half-sine) - Withstands repetitive inrush or switching surges common in automotive power distribution. |
| TJmax | +150 °C - Enables placement near heat sources (e.g., motor drivers, DC-DC converters) without thermal derating concerns. |
| Package | SMA (DO-214AC) - Surface-mount, low-profile (2.54 mm lead pitch), compatible with automated assembly and IPC-7351B land patterns. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional devices. Meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / Surge return node | Connected to protected line (e.g., 12 V rail); conducts during forward-biased surges or ESD events. |
| Cathode | Clamping reference / Ground reference | Connected to system ground or low-impedance return; establishes clamping threshold relative to ground potential. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors - supports PPAP and long-term reliability requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and eliminates corrosive halogen emissions during reflow or end-of-life processing. |
| 400 W peak pulse power (10/1000 μs) | Handles ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 surge events without failure or parameter shift. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage overshoot during fast transients - critical for protecting 3.3 V or 5 V logic interfaces downstream. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply inputs of engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and input filter capacitor. Use Value: Limits voltage to ≤18.2 V during 400 W transients, preventing damage to LDOs and microcontrollers rated for 20 V absolute maximum. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors in factory automation. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS used in series with current-sense resistor to clamp induced surges. Use Value: Maintains signal integrity under IEC 61000-4-4 EFT bursts by clamping to 18.2 V before op-amp input stages saturate or latch. |
| Consumer USB Port ESD Protection | Telecom Base Station DC Feed Protection |
|
Use Scenario: Adding secondary surge immunity to USB VBUS lines in portable medical monitors and point-of-sale terminals. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB power switch ICs to absorb contact ESD and cable discharge events. Use Value: Responds in <1 ns to ±15 kV HBM ESD, limiting voltage to 18.2 V and preserving USB PD negotiation capability. |
Use Scenario: Protecting remote radio head (RRH) DC power feeds from lightning-induced surges on outdoor telecom infrastructure. IC Role / Device Role / Timing Role: Primary clamping device on -48 V DC feed line, coordinated with gas discharge tube (GDT) front-end. Use Value: Absorbs residual energy after GDT crowbar action, ensuring downstream DC-DC converters see no more than 18.2 V transient. |
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/I | Same electrical specs and package, but RoHS-compliant commercial grade (not halogen-free or AEC-Q101 qualified). | Lacks automotive qualification and halogen-free certification; suitable for industrial/commercial designs without AEC or green-material mandates. | Select SMAJ11AHE3/I only if AEC-Q101 and halogen-free requirements are not enforced in your BOM. |
| SMBJ11A-HM3 | Same VWM/VC specs but in larger SMB (DO-214AA) package; higher PPPM = 600 W (10/1000 μs). | Offers greater surge handling margin and lower thermal resistance (RθJA ≈ 80 °C/W), but requires larger PCB footprint. | Choose SMBJ11A-HM3 when surge energy exceeds 400 W or board layout allows larger package for enhanced reliability. |
Compared with SMAJ11AHM3/I, SMAJ11AHE3/I omits automotive qualification and halogen-free compliance, while SMBJ11A-HM3 trades compact size for higher surge capacity and better thermal performance - making SMAJ11AHM3/I the optimal balance of automotive readiness, environmental compliance, and space-constrained design.
Availability
SMAJ11AHM3/I is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and telecom DC feed surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ11AHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - particularly targeting automotive, industrial, and telecom systems where voltage surges threaten functional safety and long-term operation.
FAQ
What is the clamping voltage of SMAJ11AHM3/I at its rated peak pulse current?
The SMAJ11AHM3/I clamps to a maximum of 18.2 V at its specified peak pulse current of 22 A (10/1000 μs waveform). This value is measured under standardized test conditions and represents the upper voltage limit imposed on protected circuits during surge events - a key parameter for verifying compatibility with downstream IC voltage tolerances. The SMAJ11AHM3/I maintains this clamping performance across its full operating temperature range.
Is SMAJ11AHM3/I qualified for automotive applications?
Yes, SMAJ11AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. This qualification validates its reliability under automotive temperature cycling, humidity, mechanical shock, and lifetime surge stress testing - making SMAJ11AHM3/I suitable for under-hood and body-control module deployments where functional safety and long-term stability are mandatory.
What does the 'HM3' suffix indicate for SMAJ11AHM3/I?
The 'HM3' suffix on SMAJ11AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., 'E3') and confirms compliance with automotive environmental standards and material restrictions. The 'I' further specifies 13-inch tape-and-reel packaging (7500 units per reel), supporting high-volume SMT assembly of SMAJ11AHM3/I in production environments.
How does SMAJ11AHM3/I compare to bidirectional TVS diodes like SMAJ11CA?
SMAJ11AHM3/I is unidirectional and intended for DC line protection where polarity is fixed (e.g., 12 V supply rails), offering lower leakage and tighter VBR tolerance than bidirectional variants. In contrast, SMAJ11CA provides symmetrical clamping for AC or floating signal lines but exhibits higher reverse leakage and broader VBR spread. For SMAJ11AHM3/I applications requiring polarity-aware protection with minimal standby current, the unidirectional configuration is preferred.
What is the thermal resistance of SMAJ11AHM3/I, and how does it affect PCB layout?
SMAJ11AHM3/I 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 standard FR-4 PCB layout; increasing pad area or adding thermal vias reduces RθJA and improves surge endurance. Designers must allocate adequate copper to sustain repeated 400 W pulses without exceeding TJ = +150 °C - especially in enclosed automotive enclosures where ambient temperatures exceed 85 °C.
SMAJ11AHM3/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:
- 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:
- 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/I FAQ
1.How can I place an order for SMAJ11AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11AHM3/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/I reliable?
The price and inventory of SMAJ11AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ11AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11AHM3/I?
SMAJ11AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11AHM3/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/I?
For technical support, including SMAJ11AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11AHM3/I requirements.
6.How does Aetrix verify that SMAJ11AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ11AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ11AHM3/I?
All SMAJ11AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11AHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ11AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ11AHM3/I Tags
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