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Vishay General Semiconductor - Diodes Division SMAJ14AHM3/I
- Part No.:
- SMAJ14AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14AHM3/I.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,460
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Product details
Overview
SMAJ14AHM3/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 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 rating with 10/1000 μs waveform - ideal for protecting MOSFETs, ICs, and sensor signal lines against inductive switching transients.
For engineers reviewing the SMAJ14AHM3/I datasheet, SMAJ14AHM3/I pinout, SMAJ14AHM3/I application, or SMAJ14AHM3/I equivalent, this device serves as a halogen-free, RoHS-compliant, AEC-Q101-qualified TVS for automotive-grade ESD and surge protection where low-profile surface-mount placement, fast response (<1 ns), and stable clamping under repetitive surges are required.
Technical Context
This unidirectional TVS operates by avalanche breakdown to clamp transient voltages above its VWM threshold while maintaining low leakage (<1.0 μA at 14 V). Its glass-passivated junction ensures stable performance across -55 °C to +150 °C operating temperature range and supports automated SMT assembly per J-STD-002.
The device delivers 400 W peak pulse power (derated to 300 W above 78 V), with 120 °C/W junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads. Its cathode-band polarity marking enables reliable orientation during placement, and it meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 14 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for protected circuitry. |
| VBR (Breakdown Voltage) | 15.6–17.2 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on behavior under transient stress. |
| VC (Clamping Voltage) | 23.2 V at 17.2 A - Maximum voltage seen by downstream components during 10/1000 μs surge; critical for IC-level survivability. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Energy-handling capability for single-event transients; derates to 300 W above 78 V. |
| IPPM (Peak Pulse Current) | 17.2 A - Peak surge current supported at rated clamping voltage; determines minimum trace width and PCB layout robustness. |
| TJmax | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments without thermal shutdown. |
| Package | SMA (DO-214AC) - Industry-standard 2-pin surface-mount outline; 0.208" × 0.157" footprint compatible with high-volume pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by black band on body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (unidirectional) | Connected to ground or low-impedance return path; completes clamping loop during positive transients. |
| Cathode | Avalanche clamping terminal (marked with band) | Connected to protected line (e.g., I/O, power rail); conducts when voltage exceeds VWM to shunt surge energy. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against severe ISO 7637-2 Load Dump and IEC 61000-4-5 surge events without derating in most automotive sub-systems. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, body electronics, and ADAS sensors requiring zero-failure reliability. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20E; eliminates brominated flame retardants for safer end-of-life processing. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C) without baking - reduces manufacturing overhead. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD), improving protection margin for 3.3 V and 5 V logic interfaces. |
Applications
| Automotive Sensor Signal Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) of pressure/temperature sensors in engine bays exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient spikes on signal lines upstream of ADC input or op-amp buffer. Use Value: Limits voltage to ≤23.2 V during 17.2 A surges, preventing latch-up or gate oxide damage in precision front-end circuitry. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers against field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor placed between connector and optocoupler input stage. Use Value: Maintains 14 V DC integrity while clamping 1 kV/500 A surges per IEC 61000-4-5 Level 4, ensuring system uptime and data integrity. |
| Consumer Device USB Port Protection | Telecom Power Rail Clamping |
|
Use Scenario: ESD and surge suppression on VBUS and D+/D− lines of USB 2.0 ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor tied to 5 V rail and signal lines with grounded cathode configuration. Use Value: Sub-1 ns response time and <1.0 μA leakage at 14 V preserve signal integrity and prevent false disconnects during hot-plug events. |
Use Scenario: Secondary-side clamping on 12 V or 24 V telecom power distribution boards subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing energy from coupled transients before reaching DC-DC converters or FPGAs. Use Value: 400 W rating sustains repeated 10/1000 μs surges without degradation, supporting >10-year field life in outdoor base station 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 |
|---|---|---|---|
| SMAJ14AHE3/I | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same electrical specs and package. | Approved for commercial/industrial use only; unsuitable for automotive OEM or Tier 1 production. | Select when halogen content and automotive qualification are not required, and cost optimization is prioritized. |
| SMAJ14A-M3/5A | Same halogen-free and RoHS compliance; packaged in 13" reel (7500 pcs); no AEC-Q101 qualification. | Intended for high-volume industrial manufacturing with extended reel logistics; not validated for automotive stress profiles. | Choose for non-automotive volume production where AEC-Q101 is unnecessary and tape-and-reel quantity aligns with SMT line planning. |
Compared with SMAJ14AHM3/I, SMAJ14AHE3/I omits halogen-free construction and automotive qualification - reducing cost but limiting deployment to non-automotive applications; SMAJ14A-M3/5A offers identical material compliance but lacks AEC-Q101 validation and uses a different reel format, making it suitable for industrial-scale assembly without automotive reliability requirements.
Availability
SMAJ14AHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, consumer USB interface designs, and telecom power distribution systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ14AHM3/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, thermal stability, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ14AHM3/I at its rated peak pulse current?
The SMAJ14AHM3/I has a maximum clamping voltage (VC) of 23.2 V at 17.2 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The clamping performance ensures downstream ICs remain within safe operating voltage limits during surge events, and the SMAJ14AHM3/I maintains this specification across its full temperature range (-55 °C to +150 °C).
Is SMAJ14AHM3/I qualified for automotive applications?
Yes, SMAJ14AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix - denoting halogen-free, RoHS-compliant, and automotive-grade qualification. It is approved for use in engine control units, body electronics, and ADAS subsystems where reliability under thermal cycling, vibration, and high-energy transients is critical. The SMAJ14AHM3/I undergoes rigorous stress testing per AEC-Q101 Rev D, including HTGB, HTRB, and TCT, and is documented in Vishay's official qualification reports.
What does the "HM3" suffix mean in SMAJ14AHM3/I?
The "HM3" suffix in SMAJ14AHM3/I specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification. "H" denotes halogen-free molding compound; "M3" indicates RoHS compliance per JEDEC J-STD-609A Class 3, and the "/I" denotes 13-inch tape-and-reel packaging (7500 pcs). This distinguishes SMAJ14AHM3/I from commercial variants like SMAJ14A-E3/I (RoHS only) or SMAJ14A-M3/5A (halogen-free but not AEC-Q101 qualified).
Can SMAJ14AHM3/I be used in bidirectional protection circuits?
No, SMAJ14AHM3/I is a unidirectional TVS diode and must not be used for bidirectional protection. Its cathode-band polarity requires correct orientation - anode to ground, cathode to protected line - to function. For bidirectional applications, Vishay specifies the SMAJ14CA family (e.g., SMAJ14CAHM3/I), which provides symmetrical clamping in both directions and carries a "CA" suffix. Using SMAJ14AHM3/I in place of a bidirectional part risks failure during negative-going transients.
What is the thermal resistance of SMAJ14AHM3/I, and how does it affect PCB layout?
The SMAJ14AHM3/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 board thickness and no internal plane coupling. To maintain reliability under repetitive surges, designers should allocate adequate copper area and avoid narrow traces; increasing pad size or adding thermal vias can reduce effective RθJA. The SMAJ14AHM3/I's RθJL of 30 °C/W further supports heat transfer to leads during short-duration pulses.
SMAJ14AHM3/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):
- 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/I FAQ
1.How can I place an order for SMAJ14AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14AHM3/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/I reliable?
The price and inventory of SMAJ14AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ14AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14AHM3/I?
SMAJ14AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14AHM3/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/I?
For technical support, including SMAJ14AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14AHM3/I requirements.
6.How does Aetrix verify that SMAJ14AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ14AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ14AHM3/I?
All SMAJ14AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14AHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ14AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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