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Vishay General Semiconductor - Diodes Division SMAJ14AHM3/H
- Part No.:
- SMAJ14AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14AHM3/H.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,361
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Product details
Overview
SMAJ14AHM3/H 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 14 V standoff voltage (VWM), 15.6–17.2 V breakdown voltage (VBR) at 1 mA, 23.2 V maximum clamping voltage (VC) at 17.2 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform). It is widely used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ14AHM3/H datasheet, SMAJ14AHM3/H pinout, SMAJ14AHM3/H application, or SMAJ14AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, activated when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ps), enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above that threshold. Thermal performance is defined by RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, supporting reliable operation under repetitive transient stress in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 14 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (Breakdown Voltage) | 15.6–17.2 V at 1 mA - Confirmed avalanche conduction onset range for reliable overvoltage triggering |
| VC (Clamping Voltage) | 23.2 V at 17.2 A - Peak voltage seen by protected circuit during 10/1000 μs surge, limiting downstream stress |
| IPPM (Peak Pulse Current) | 17.2 A - Maximum non-repetitive surge current the device safely clamps without failure |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity per industry-standard 10/1000 μs waveform |
| TJmax | 150 °C - Maximum junction temperature enabling use in under-hood automotive and high-ambient industrial environments |
| Package | SMA (DO-214AC) - Low-profile, surface-mount package compatible with J-STD-020 MSL Level 1 reflow |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to lower-potential side (e.g., GND or return rail); carries full surge current during clamping |
| Cathode | Reverse-biased terminal / Clamping node | Connected to protected line (e.g., 12 V rail); initiates avalanche conduction when VAK ≥ VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per AEC stress test plan |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-020 requirements for green manufacturing and end-of-life processing |
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surge events in 12 V systems |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage overshoot during transient events, reducing risk of latch-up or gate oxide damage in downstream ICs |
| MSL Level 1 (260 °C peak) | Supports single-reflow assembly without moisture sensitivity concerns, eliminating bake-out requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs, body control modules, and lighting drivers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp positive transients exceeding 14 V. Use Value: Limits voltage to ≤23.2 V during 17.2 A surges, preventing damage to 36 V-rated DC-DC converters and CAN transceivers. |
Use Scenario: Shielding analog and digital sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS connected across signal and ground lines to shunt fast transients before they reach ADC inputs or microcontroller GPIOs. Use Value: Sub-nanosecond response ensures clamping occurs before sensitive front-end amplifiers saturate or sustain gate oxide stress. |
| Consumer Power Adapter Input Stage | MOSFET Gate Driver Protection |
|
Use Scenario: Safeguarding AC-DC adapter primary-side controllers and secondary-side rectifiers from line surges and cross-talk. IC Role / Device Role / Timing Role: Mounted at input filter stage to absorb differential-mode surges before reaching bridge rectifier and bulk capacitor. Use Value: 400 W rating handles IEC 61000-4-5 Level 3 (2 kV/12 Ω) surges without degradation over 100,000 cycles. |
Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFETs driven by bootstrap circuits in motor inverters. IC Role / Device Role / Timing Role: Placed between gate and source to clamp Miller-induced voltage spikes during high dV/dt switching transitions. Use Value: Low VC/VBR ratio ensures gate voltage stays within ±20 V absolute maximum rating even during 100 V/ns edge rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14AHE3/H | Same electrical specs but RoHS-compliant (E3), not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial/industrial designs where automotive qualification is not required | Select SMAJ14AHE3/H for cost-sensitive non-automotive applications with identical clamping performance |
| SMBJ14A-HM3 | Higher 600 W PPPM, larger SMB (DO-214AA) package, same VWM/VC ratings | Better suited for higher-energy transients where board space allows larger footprint | Choose SMBJ14A-HM3 when surge immunity must exceed IEC 61000-4-5 Level 4 (4 kV) and thermal margin is critical |
Compared with SMAJ14AHM3/H, SMAJ14AHE3/H offers identical protection performance without halogen-free or automotive qualification, while SMBJ14A-HM3 delivers 50 % higher surge power in a larger package-enabling design flexibility between space-constrained AEC-Q101 compliance and enhanced energy handling.
Availability
SMAJ14AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor nodes, and consumer power supply designs requiring stable component supply with long-term lifecycle assurance.
Supply support for SMAJ14AHM3/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 high-reliability diodes, MOSFETs, and passive components for demanding industrial and automotive applications.
The SMAJ series was engineered specifically for surface-mount transient suppression in space-constrained, high-surge environments-balancing low profile, AEC-Q101 compliance, and repeatable clamping performance across temperature and lifetime.
FAQ
What is the maximum clamping voltage of the SMAJ14AHM3/H under a 10/1000 μs surge?
The SMAJ14AHM3/H has a maximum clamping voltage (VC) of 23.2 V at 17.2 A peak pulse current, measured per the 10/1000 μs waveform standard. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuits during transient events. The SMAJ14AHM3/H maintains this clamping performance with minimal variation due to its glass-passivated junction and low dynamic impedance.
Does the SMAJ14AHM3/H meet automotive qualification standards?
Yes, the SMAJ14AHM3/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and surge endurance-validating its suitability for under-hood and chassis-mounted automotive applications. The SMAJ14AHM3/H also meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow requirements.
How does the SMAJ14AHM3/H differ from the SMAJ14A-E3 variant?
The SMAJ14AHM3/H is halogen-free and AEC-Q101 qualified, whereas the SMAJ14A-E3 is RoHS-compliant but not halogen-free and lacks automotive qualification. Both share identical electrical parameters (VWM, VBR, VC, PPPM), but the HM3 suffix guarantees compliance with automotive material and reliability standards. For designs targeting IATF 16949 or OEM Tier-1 supply chains, SMAJ14AHM3/H is the required variant.
What is the thermal resistance of the SMAJ14AHM3/H in standard mounting conditions?
The SMAJ14AHM3/H 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, and a junction-to-lead resistance (RθJL) of 30 °C/W. These values enable accurate thermal modeling for sustained power dissipation up to 3.3 W at 50 °C ambient, ensuring safe operation in sealed enclosures or high-density PCB layouts where airflow is limited.
Can the SMAJ14AHM3/H be used in bidirectional configurations?
No, the SMAJ14AHM3/H is a unidirectional TVS diode, as indicated by the "A" suffix (versus "CA" for bidirectional variants). Its cathode band marks the polarity-sensitive terminal, and it conducts only in reverse breakdown-making it unsuitable for AC line or symmetrical signal protection without external circuitry. For bidirectional protection at 14 V standoff, the SMAJ14CAHM3/H would be the correct variant.
SMAJ14AHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 17.2A
- 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)
SMAJ14AHM3/H FAQ
1.How can I place an order for SMAJ14AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14AHM3/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 SMAJ14AHM3/H reliable?
The price and inventory of SMAJ14AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ14AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14AHM3/H?
SMAJ14AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14AHM3/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 SMAJ14AHM3/H?
For technical support, including SMAJ14AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14AHM3/H requirements.
6.How does Aetrix verify that SMAJ14AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ14AHM3/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 SMAJ14AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ14AHM3/H?
All SMAJ14AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14AHM3/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 SMAJ14AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ14AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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