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Vishay General Semiconductor - Diodes Division SMAJ14AHM3_A/H
- Part No.:
- SMAJ14AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14AHM3_A/H.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,319
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Product details
Overview
SMAJ14AHM3_A/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 stand-off voltage (VWM), 23.2 V maximum clamping voltage (VC) at 17.2 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 SMAJ14AHM3_A/H datasheet, SMAJ14AHM3_A/H pinout, SMAJ14AHM3_A/H application, or SMAJ14AHM3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), unidirectional polarity with cathode band marking, and thermal resistance (RθJA = 120 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below 14 V (VWM) and rapidly switches to low-impedance conduction above its 15.6–17.2 V breakdown range (VBR at 1 mA). Its glass-passivated junction enables sub-nanosecond response to ESD and lightning-induced surges.
Designed for automated SMT assembly, it meets J-STD-020 MSL Level 1 (peak reflow 260 °C) and supports repetitive surge duty cycles up to 0.01 %, with derating above 25 °C ambient per Fig. 2 in the datasheet. The SMA package provides mechanical robustness while limiting thermal resistance to 30 °C/W junction-to-lead.
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 threshold range defining turn-on precision |
| VC @ IPPM | 23.2 V at 17.2 A - Clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPPM | 400 W - Peak pulse power handling capability under standardized surge waveform |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms), critical for inductive load switching protection |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| RθJA | 120 °C/W - Thermal resistance indicating required PCB copper area (0.2" × 0.2") for safe power dissipation |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; cathode indicated by a band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to protected line side; conducts only when cathode is more positive than anode |
| Cathode | Forward current exit / clamping reference | Banded end; ties to ground or lower-potential rail to shunt transients away from sensitive circuitry |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling and HTRB |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates without compromising surge robustness or solderability |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients common in 12 V/24 V vehicle power networks and industrial motor drives |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising surges, improving protection margin for 3.3 V/5 V logic |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking, reducing manufacturing cost and process complexity |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump and jump-start transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and input stage of voltage regulator or microcontroller power supply. Use Value: Limits voltage to ≤23.2 V during 400 W surges, preventing latch-up or permanent damage to downstream 3.3 V/5 V logic. | Use Scenario: Shielding analog and digital signal lines (e.g., CAN, LIN, or I²C) from ESD and inductive coupling in factory automation sensors. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector entry point to divert fast transients before reaching MCU GPIO or transceiver inputs. Use Value: Sub-nanosecond response ensures clamping occurs before signal integrity degradation or data corruption occurs. |
| Consumer Power Adapter Input Stage | MOSFET Gate Driver Protection |
Use Scenario: Protecting AC-DC adapter primary-side controllers and secondary-side synchronous rectifiers from line surges and cross-conduction spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS across bulk capacitor or controller VDD input to clamp overvoltage events exceeding 14 V. Use Value: Maintains system reliability under IEC 61000-4-5 Level 3 (1 kV/2 kV) surge testing without derating design margins. | Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFET drivers subjected to Miller-induced voltage spikes during switching transitions. IC Role / Device Role / Timing Role: TVS placed between gate and source terminals to clamp transient excursions beyond ±20 V absolute maximum ratings. Use Value: 23.2 V clamping voltage ensures gate-source voltage stays within safe operating area even during 17.2 A surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14AHE3_A/H | Same electrical specs but RoHS-compliant (E3), not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial-grade designs where automotive qualification is not required | Select when halogen-free content or automotive qualification is unnecessary and cost optimization is prioritized |
| SMAJ14A-M3/61 | Identical halogen-free RoHS compliance (M3), but packaged in 7" tape/reel with different ordering code; no AEC-Q101 | Preferred for non-automotive industrial production with standard reel logistics | Choose for volume procurement where AEC-Q101 is not mandated and packaging format aligns with SMT line setup |
Compared with SMAJ14AHM3_A/H, SMAJ14AHE3_A/H offers identical clamping performance but omits automotive qualification and halogen-free assurance, while SMAJ14A-M3/61 provides equivalent environmental compliance without AEC-Q101 - making SMAJ14AHM3_A/H the sole option meeting full automotive-grade, halogen-free, and RoHS requirements in this voltage class.
Availability
SMAJ14AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and consumer power adapter designs requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ14AHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated through proven clamping behavior and AEC-Q101 validation.
FAQ
What is the clamping voltage of SMAJ14AHM3_A/H at its rated peak pulse current?
The SMAJ14AHM3_A/H has a maximum clamping voltage (VC) of 23.2 V at its rated peak pulse current (IPPM) of 17.2 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is confirmed in the Electrical Characteristics table of Vishay's Document Number 88390. The SMAJ14AHM3_A/H maintains this clamping performance across its qualified operating temperature range.
Is SMAJ14AHM3_A/H qualified for automotive applications?
Yes, SMAJ14AHM3_A/H is AEC-Q101 qualified, as explicitly stated in the "MECHANICAL DATA" section of the Vishay datasheet (Document Number 88390, Revision 09-Jan-2024). The "HM3" suffix denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and accelerated life testing - confirming suitability for under-hood and chassis-mounted automotive electronics where reliability under thermal and electrical stress is mandatory.
What does the "HM3" suffix mean in SMAJ14AHM3_A/H?
The "HM3" suffix in SMAJ14AHM3_A/H indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table, HM3 denotes base P/N with halogen-free molding compound and full automotive qualification ("HM3_X" where "_X" is revision code A/H). This distinguishes it from E3 (RoHS only), M3 (halogen-free RoHS, non-automotive), and HE3 (RoHS + AEC-Q101, non-halogen-free). The "A/H" denotes the specific revision level and packaging configuration (7" tape/reel).
What is the thermal resistance of SMAJ14AHM3_A/H, and how does it affect PCB layout?
SMAJ14AHM3_A/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, as specified in the Thermal Characteristics table. This value requires adequate copper area to dissipate 3.3 W continuous power (PD) without exceeding the +150 °C maximum junction temperature. Reducing pad size increases RθJA, risking thermal runaway during repetitive surge events - so the SMAJ14AHM3_A/H must be laid out per Vishay's recommended mounting pad dimensions to ensure reliable operation.
How does SMAJ14AHM3_A/H differ from bidirectional SMAJ14CA variants?
SMAJ14AHM3_A/H is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction is blocked. In contrast, SMAJ14CA variants are bidirectional, offering symmetrical clamping in both polarities - suitable for AC lines or differential signal pairs. The SMAJ14AHM3_A/H has a 14 V stand-off (VWM) and 15.6–17.2 V breakdown (VBR), whereas SMAJ14CA exhibits identical VWM/VBR in both directions. Functionally, SMAJ14AHM3_A/H cannot replace SMAJ14CA in AC-coupled applications without circuit redesign.
SMAJ14AHM3_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):
- 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/H FAQ
1.How can I place an order for SMAJ14AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14AHM3_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 SMAJ14AHM3_A/H reliable?
The price and inventory of SMAJ14AHM3_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 SMAJ14AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ14AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14AHM3_A/H?
SMAJ14AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14AHM3_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 SMAJ14AHM3_A/H?
For technical support, including SMAJ14AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ14AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ14AHM3_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 SMAJ14AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ14AHM3_A/H?
All SMAJ14AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14AHM3_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 SMAJ14AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ14AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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