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Vishay General Semiconductor - Diodes Division SMAJ11AHE3_A/H
- Part No.:
- SMAJ11AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11AHE3_A/H.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,139
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Product details
Overview
SMAJ11AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping transient overvoltages on power and signal lines. It features 12.2 V minimum breakdown voltage (VBR), 11 V maximum stand-off voltage (VWM), 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 SMAJ11AHE3_A/H datasheet, SMAJ11AHE3_A/H pinout, SMAJ11AHE3_A/H application, or SMAJ11AHE3_A/H equivalent, this device delivers AEC-Q101 qualification, low incremental surge resistance, fast response time, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and surge protection design.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping protector: when reverse voltage exceeds VWM = 11 V, it avalanches at VBR ≥ 12.2 V (tested at 1 mA), limiting transient energy to ≤ 18.2 V at IPPM = 22 A. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and repeatable clamping performance across temperature.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C. The cathode band marking identifies polarity, and its SMA package supports automated placement per J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (min) | 12.2 V at IT = 1 mA - Minimum avalanche initiation voltage; ensures predictable turn-on threshold under transients. |
| VC (max) | 18.2 V at IPPM = 22 A - Maximum clamped voltage during 10/1000 μs surge; determines protected circuit's peak stress level. |
| PPPM | 400 W - Peak pulse power handling capability; enables robust suppression of inductive switching spikes and ESD events. |
| IFSM | 40 A - Peak forward surge current rating (8.3 ms half-sine); supports unidirectional surge tolerance during fault conditions. |
| TJ max | +150 °C - Maximum junction temperature; allows deployment in under-hood automotive and high-ambient industrial environments. |
| Leakage (ID) | ≤1.0 μA at VWM - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads; meets UL 94 V-0, MSL Level 1 (260 °C peak reflow), and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; completes clamping loop during overvoltage events. |
| Cathode | Protected line connection / transient sink | Connected to the line being protected (e.g., 12 V rail or sensor input); conducts avalanche current to anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for engine control, ADAS, and body electronics. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from inductive load switching (e.g., solenoid drivers) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.49) | Minimizes overvoltage overshoot during clamping - critical for protecting 12 V logic interfaces and analog front-ends. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter consistency across thermal and humidity stress. |
| MSL Level 1, 260 °C peak reflow | Enables standard SMT assembly without pre-baking; compatible with high-volume automated PCB manufacturing. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and local regulator input. Use Value: Limits transient voltage to ≤18.2 V, preventing damage to downstream LDOs and microcontrollers rated for 20 V absolute max. |
Use Scenario: Shielding analog outputs of pressure or temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between sensor output line and ground. Use Value: Sub-1 μA leakage avoids signal offset errors; fast response (<1 ns) prevents latch-up in precision ADC inputs. |
| Consumer Device USB Port Protection | Telecom Line Interface Surge Suppression |
Use Scenario: Safeguarding USB VBUS and D+/D− lines in portable chargers and docking stations. IC Role / Device Role / Timing Role: Discrete TVS array (individual SMAJ11AHE3_A/H per line) placed at connector entry point. Use Value: 11 V VWM aligns with USB 2.0 VBUS tolerance; 18.2 V VC ensures USB PHY ICs remain within safe operating area. |
Use Scenario: Front-end protection for Ethernet PHY or RS-485 transceivers exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on differential pair, coordinated with common-mode chokes. Use Value: 400 W rating sustains multi-kV surge events per ITU-T K.21; AEC-Q101 grade adds confidence for outdoor telecom cabinets. |
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-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101). | Lacks automotive qualification; not recommended for under-hood or safety-critical modules. | Select when cost-sensitive industrial or consumer designs do not require automotive reliability validation. |
| SMAJ11AHM3_A/H | Identical AEC-Q101 qualification and performance; halogen-free molding compound (per IEC 61249-2-21). | Required where halogen-free compliance is mandated by OEM or regional environmental regulations (e.g., EU automotive Tier 1). | Choose for green manufacturing programs or export to markets enforcing halogen restrictions. |
Compared with SMAJ11AHE3_A/H, the SMAJ11A-E3/61 offers identical clamping and power ratings but lacks automotive qualification, while SMAJ11AHM3_A/H matches all specifications and adds halogen-free compliance - making the HE3 variant optimal for general AEC-Q101 applications without material restrictions.
Availability
SMAJ11AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer USB power delivery systems, and telecom line interface modules requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ11AHE3_A/H 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for board-level transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, lightning, and inductive switching is mandatory.
FAQ
What is the clamping voltage of SMAJ11AHE3_A/H at its rated peak pulse current?
The SMAJ11AHE3_A/H has a maximum clamping voltage (VC) of 18.2 V at IPPM = 22 A with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on the protected circuit during surge events. The SMAJ11AHE3_A/H maintains this clamping performance across its qualified temperature range and after repeated surge exposure per AEC-Q101 requirements.
Is SMAJ11AHE3_A/H suitable for bidirectional signal line protection?
No, SMAJ11AHE3_A/H is a unidirectional TVS diode - it conducts only in reverse bias above VBR and blocks forward current beyond ~3.5 V (VF at 25 A). For bidirectional protection (e.g., data lines like RS-485 or CAN), a bidirectional variant such as SMAJ11CA must be used. The SMAJ11AHE3_A/H is intended for DC power rails or single-polarity signal paths where polarity is fixed and known.
Does SMAJ11AHE3_A/H meet automotive qualification standards?
Yes, SMAJ11AHE3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation (Document Number 88390, Revision 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and surge endurance - validating its suitability for automotive powertrain, chassis, and body electronics applications.
What is the thermal resistance from junction to ambient for SMAJ11AHE3_A/H?
The typical thermal resistance from junction to ambient (RθJA) for SMAJ11AHE3_A/H is 120 °C/W, measured on a standard 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad layout per JEDEC standards. This value assumes no additional heatsinking; actual thermal performance improves with larger copper areas or internal layer planes. RθJL = 30 °C/W enables effective heat transfer to PCB traces or thermal vias.
How does the leakage current of SMAJ11AHE3_A/H compare to similar TVS diodes?
SMAJ11AHE3_A/H specifies maximum reverse leakage current (ID) of 1.0 μA at VWM = 11 V and TA = 25 °C - among the lowest in the SMAJ family for this voltage grade. This ultra-low leakage preserves signal fidelity in high-impedance sensor interfaces and reduces standby power loss in always-on automotive modules, outperforming many competing 12 V TVS devices that specify 5–50 μA at VWM.
SMAJ11AHE3_A/H 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ11AHE3_A/H FAQ
1.How can I place an order for SMAJ11AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11AHE3_A/H 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 SMAJ11AHE3_A/H reliable?
The price and inventory of SMAJ11AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ11AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11AHE3_A/H?
SMAJ11AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11AHE3_A/H 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 SMAJ11AHE3_A/H?
For technical support, including SMAJ11AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ11AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ11AHE3_A/H 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 SMAJ11AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ11AHE3_A/H?
All SMAJ11AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11AHE3_A/H, 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 SMAJ11AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ11AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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