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Vishay General Semiconductor - Diodes Division SMAJ14AHM3_A/I
- Part No.:
- SMAJ14AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14AHM3_A/I.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,329
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Product details
Overview
SMAJ14AHM3_A/I 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 stand-off 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed to protect MOSFETs and ICs in automotive power supplies.
For engineers reviewing the SMAJ14AHM3_A/I datasheet, SMAJ14AHM3_A/I pinout, SMAJ14AHM3_A/I application, or SMAJ14AHM3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), junction temperature range (–55 to +150 °C), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (<1 μA leakage at 14 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR and low incremental surge resistance, enabling consistent clamping performance across repetitive surges.
The device is rated for 400 W peak pulse power (10/1000 μs) up to 78 V, derating to 300 W above that; it sustains 40 A non-repetitive forward surge (8.3 ms half-sine) and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Polarity is marked by a cathode band, confirming unidirectional operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 15.6 V / 17.2 V at 1 mA - Confirmed breakdown range defining turn-on threshold tolerance |
| VC @ IPPM | 23.2 V at 17.2 A - Clamped voltage during 10/1000 μs surge, limiting stress on downstream components |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy absorption capability under standard waveform |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms), critical for inrush and load-dump immunity |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood automotive environments |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" pad layout |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified (HM3 suffix). Cathode indicated by molded band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when V > VBR |
| Anode (unbanded end) | Reference/return path | Typically tied to system ground or lower-potential rail for unidirectional clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock |
| 400 W peak pulse power (10/1000 μs) | Robust protection against ISO 7637-2 load dump and IEC 61000-4-5 surge events |
| Glass passivated junction | Ensures stable VBR over time and temperature, minimizing parameter drift in harsh environments |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs compared to higher-ratio suppressors |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp surges within 1 ns response time. Use Value: Limits rail voltage to ≤23.2 V during 17.2 A transients, preventing damage to 36 V-rated CAN transceivers and microcontrollers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC inputs in factory automation. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 0 V) TVS mounted directly at sensor connector to suppress ESD (IEC 61000-4-2) and inductive switching noise. Use Value: Maintains signal integrity below 14 V operating range while clamping ±15 kV contact ESD to <30 V peak. |
| Consumer USB Power Input Stage | Telecom DC Feeder Line Surge Mitigation |
Use Scenario: Secondary overvoltage protection on 5 V USB-C power delivery paths after primary DC-DC regulation. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing residual transients from hot-plug events and cable-induced surges. Use Value: Withstands 40 A surge (8.3 ms) and holds leakage <1 μA at 14 V, ensuring no standby power loss in always-on devices. |
Use Scenario: Front-end protection on -48 V telecom DC feeder lines exposed to lightning-induced surges (IEC 61000-4-5 Level 4). IC Role / Device Role / Timing Role: High-power unidirectional TVS placed between feed line and ground plane to divert multi-kA transients. Use Value: Delivers 300 W clamping capability above 78 V, supporting sustained suppression of long-tail surges without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14AHE3_A/I | RoHS-compliant, commercial-grade (non-AEC-Q101); same VWM, VBR, VC, and package | Lacks automotive qualification; unsuitable for under-hood or safety-critical modules | Select when cost-sensitive industrial or consumer designs do not require AEC-Q101 validation |
| SMBJ14A-HM3_A/I | Same electrical specs but SMB (DO-214AA) package - 2.5 mm wider body, higher RθJA (100 °C/W), 600 W PPPM rating | Higher power handling but larger footprint; requires PCB layout change | Choose when surge energy exceeds 400 W or thermal margin is constrained on small pads |
Compared with SMAJ14AHM3_A/I, the HE3 variant trades automotive qualification for lower cost in non-automotive settings, while the SMBJ14A-HM3_A/I offers greater surge capacity at the expense of board space and thermal efficiency - both require explicit validation for pin compatibility and layout adaptation.
Availability
SMAJ14AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power systems requiring stable component supply with AEC-Q101 assurance and halogen-free compliance.
Supply support for SMAJ14AHM3_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, precision, and automotive-grade validation.
The SMAJ series was developed specifically for robust, surface-mount transient suppression in space-constrained automotive and industrial power systems, balancing high surge capability with MSL-1 reflow compatibility and AEC-Q101 compliance.
FAQ
What is the clamping voltage of SMAJ14AHM3_A/I at its rated peak pulse current?
The SMAJ14AHM3_A/I has a maximum clamping voltage (VC) of 23.2 V at its specified peak pulse current (IPPM) of 17.2 A under the 10/1000 μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events. The clamping performance is guaranteed across the full operating temperature range (–55 to +150 °C) and is integral to the device's role in safeguarding 12 V automotive electronics.
Is SMAJ14AHM3_A/I qualified for automotive applications?
Yes, SMAJ14AHM3_A/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's official datasheet (Document Number: 88390, Revision: 09-Jan-2024). This qualification covers stress tests including temperature cycling, humidity bias, and mechanical shock, making SMAJ14AHM3_A/I suitable for under-hood and safety-related vehicle subsystems where reliability under thermal and vibration stress is mandatory.
What does the "HM3" suffix indicate in SMAJ14AHM3_A/I?
The "HM3" suffix in SMAJ14AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from commercial-grade versions (e.g., E3/M3) and confirms compliance with automotive material requirements, including JESD201 Class 2 whisker resistance and UL 94 V-0 flammability rating of the molding compound - all verified per Vishay's ordering information table.
How does SMAJ14AHM3_A/I compare to bidirectional TVS diodes like SMAJ14CA?
SMAJ14AHM3_A/I is unidirectional and intended for DC line protection where polarity is fixed (e.g., +12 V rail to ground), whereas SMAJ14CA is bidirectional and suited for AC or floating signal lines. SMAJ14AHM3_A/I exhibits forward conduction behavior below VWM and uses a cathode band for orientation; SMAJ14CA lacks polarity marking and clamps symmetrically in both directions - substitution requires circuit-level validation of bias configuration and surge directionality.
What is the thermal resistance and recommended pad layout for SMAJ14AHM3_A/I?
SMAJ14AHM3_A/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, as defined in Vishay's datasheet. This layout is essential to sustain its 400 W peak pulse rating and avoid thermal runaway during repetitive surges. Deviating from this pad size increases RθJA and reduces safe operating energy, particularly in high-temperature ambient conditions.
SMAJ14AHM3_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):
- 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_A/I FAQ
1.How can I place an order for SMAJ14AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14AHM3_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 SMAJ14AHM3_A/I reliable?
The price and inventory of SMAJ14AHM3_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 SMAJ14AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ14AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14AHM3_A/I?
SMAJ14AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14AHM3_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 SMAJ14AHM3_A/I?
For technical support, including SMAJ14AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ14AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ14AHM3_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 SMAJ14AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ14AHM3_A/I?
All SMAJ14AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14AHM3_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 SMAJ14AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ14AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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