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Vishay General Semiconductor - Diodes Division SMAJ15AHM3/I
- Part No.:
- SMAJ15AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15AHM3/I.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,975
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Product details
Overview
SMAJ15AHM3/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 15 V standoff voltage (VWM), 16.7–18.5 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤24.4 V at 16.4 A peak pulse current (IPPM) under 10/1000 μs waveform - ideal for safeguarding MOSFET gates, microcontroller I/O lines, and automotive sensor interfaces.
For engineers reviewing the SMAJ15AHM3/I datasheet, SMAJ15AHM3/I pinout, SMAJ15AHM3/I application, or SMAJ15AHM3/I equivalent, this device delivers verified 400 W peak pulse power (≤78 V), AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for automotive-grade reliability and automated SMT assembly in harsh environments.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for fast response (<1 ps) and low incremental surge resistance. Its thermal design supports continuous operation up to +150 °C junction temperature, with RθJA = 120 °C/W on standard 0.2" × 0.2" copper pads.
The SMAJ15AHM3/I is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and exhibits <1.0 μA maximum reverse leakage at VWM, ensuring minimal standby power loss in always-on circuits such as CAN bus nodes or battery-backed sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 15 V - Maximum continuous reverse voltage before clamping begins; defines safe operating margin for 12 V automotive or 15 V industrial supply rails. |
| VBR (Breakdown Voltage) | 16.7–18.5 V at 1 mA - Confirmed breakdown range ensures reliable triggering above nominal rail while avoiding false trips during normal transients. |
| VC (Clamping Voltage) | ≤24.4 V at 16.4 A (10/1000 μs) - Limits downstream voltage stress to levels compatible with 24 V-rated logic and analog ICs. |
| PPPM (Peak Pulse Power) | 400 W - Sustains high-energy ESD and load-dump surges without degradation when mounted per recommended pad layout. |
| IPPM (Peak Pulse Current) | 16.4 A - Quantifies maximum transient current the device can shunt while maintaining specified clamping performance. |
| TJmax | +150 °C - Enables deployment in under-hood automotive modules and industrial motor drives with elevated ambient temperatures. |
| AEC-Q101 Qualified | Yes - Validated for automotive applications per stress test requirements including HTOL, TC, and HTRB; HM3 suffix denotes qualification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., signal or power rail); conducts surge current to ground during overvoltage events. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lowest potential reference; completes clamping path for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 Load Dump Pulse 5a (up to 110 V, 400 ms) when used with series impedance in automotive power nets. |
| Glass passivated chip junction | Ensures stable VBR and low leakage over temperature and lifetime, critical for long-term reliability in sealed enclosures. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow without popcorn cracking or delamination, eliminating pre-bake requirements in high-volume SMT lines. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive OEM material restrictions (e.g., GMW3172, Ford WSS-M99P999-A1) and simplifies end-of-life recycling compliance. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., EFT bursts), improving protection margin for sub-20 V logic interfaces. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protects 12 V CAN transceiver power pins and LIN bus lines from load dump and jump-start surges. IC Role / Device Role: Unidirectional clamping TVS placed between VCC and GND, upstream of LDO regulator input. Use Value: Clamps 110 V/400 ms load dump to ≤24.4 V, preventing regulator latch-up and enabling uninterrupted CAN communication. |
Use Scenario: Shields 24 V digital input optocoupler front-end from inductive kickback when switching solenoids or relays. IC Role / Device Role: Standoff-rated TVS connected across input terminals to divert surge energy before it reaches current-limiting resistor and opto-LED. Use Value: Limits transient voltage to <25 V, preserving optocoupler CTR stability and extending isolation barrier lifetime. |
| Consumer Appliance Motor Drive Board | Telecom Remote Sensor Node |
|
Use Scenario: Guards MCU GPIO pins driving brushed DC motors against back-EMF spikes during commutation. IC Role / Device Role: Localized TVS on each motor control output trace, cathode to MCU pin, anode to ground plane. Use Value: Suppresses >1 kV/μs spikes to <25 V within nanoseconds, preventing I/O latch-up and firmware resets. |
Use Scenario: Secures RS-485 transceiver data lines against lightning-induced surges in outdoor utility metering installations. IC Role / Device Role: Bidirectional-capable variant not applicable; SMAJ15AHM3/I used on VCC rail only, paired with bidirectional TVS on differential lines. Use Value: Maintains 15 V rail integrity during 6 kV ESD contact discharge, ensuring transceiver bias remains stable for error-free packet reception. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15AHE3/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Acceptable for commercial/industrial use where automotive qualification is not required. | Select when cost sensitivity outweighs halogen-free or automotive compliance needs. |
| SMAJ15A-M3/5A | Identical ratings and AEC-Q101 qualification; differs only in packaging (13" reel, 7500 pcs) and base P/N suffix format. | No functional difference; same board-level performance and reliability. | Choose based on procurement logistics - SMAJ15AHM3/I uses 7" reel (1800 pcs), better for low-volume or prototyping runs. |
Compared with SMAJ15AHE3/I, the SMAJ15AHM3/I adds halogen-free construction and AEC-Q101 validation for automotive systems, while SMAJ15A-M3/5A offers identical performance in higher-volume tape-and-reel configuration - enabling optimized sourcing without circuit redesign.
Availability
SMAJ15AHM3/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and consumer appliance motor control requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMAJ15AHM3/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMAJ series was engineered specifically for robust transient suppression in automotive power nets and industrial I/O interfaces, balancing high pulse power, fast response, and AEC-Q101 compliance in compact surface-mount packages.
FAQ
What is the clamping voltage of the SMAJ15AHM3/I at its rated peak pulse current?
The SMAJ15AHM3/I clamps to a maximum of 24.4 V at its rated peak pulse current of 16.4 A under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024 (Document Number: 88390). The clamping voltage directly determines the maximum stress imposed on downstream components, making it a critical parameter for interface protection design using the SMAJ15AHM3/I.
Is the SMAJ15AHM3/I suitable for automotive applications?
Yes, the SMAJ15AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix, and meets automotive-grade reliability requirements including high-temperature operating life, thermal cycling, and humidity testing. It is explicitly intended for use in automotive subsystems such as body control modules, infotainment power supplies, and sensor interfaces - all validated per the qualification standard referenced in the Vishay datasheet for SMAJ15AHM3/I.
What does the "HM3" suffix mean in SMAJ15AHM3/I?
The "HM3" suffix in SMAJ15AHM3/I denotes halogen-free, RoHS-compliant construction with full AEC-Q101 qualification. Per Vishay's ordering information, HM3 devices meet JESD201 Class 2 whisker resistance and UL 94 V-0 flammability standards, distinguishing them from E3 (RoHS only) and HE3 (AEC-Q101 but not halogen-free) variants - a key differentiator for automotive OEM compliance using the SMAJ15AHM3/I.
How does the SMAJ15AHM3/I compare to bidirectional TVS diodes like SMAJ15CA?
The SMAJ15AHM3/I is unidirectional and features a cathode band, limiting conduction to reverse-bias conditions only; SMAJ15CA is bidirectional with no polarity marking and symmetric clamping in both directions. This makes SMAJ15AHM3/I appropriate for DC power rail protection (e.g., 12 V or 15 V supplies), whereas SMAJ15CA suits AC-coupled or differential signal lines. Their VWM, VBR, and VC values differ accordingly - SMAJ15AHM3/I is not interchangeable with SMAJ15CA without circuit review.
What is the maximum operating temperature for the SMAJ15AHM3/I?
The SMAJ15AHM3/I has a maximum junction temperature (TJmax) of +150 °C, as specified in the Absolute Maximum Ratings table of the Vishay datasheet. This rating enables reliable operation in under-hood automotive environments and enclosed industrial enclosures. Derating curves (Fig. 2) show that peak pulse power must be reduced above 25 °C ambient, and thermal design must ensure RθJA ≤120 °C/W using the recommended 0.2" × 0.2" copper pads to maintain safe operation of the SMAJ15AHM3/I.
SMAJ15AHM3/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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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)
SMAJ15AHM3/I FAQ
1.How can I place an order for SMAJ15AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15AHM3/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 SMAJ15AHM3/I reliable?
The price and inventory of SMAJ15AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ15AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15AHM3/I?
SMAJ15AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15AHM3/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 SMAJ15AHM3/I?
For technical support, including SMAJ15AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15AHM3/I requirements.
6.How does Aetrix verify that SMAJ15AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ15AHM3/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 SMAJ15AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ15AHM3/I?
All SMAJ15AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15AHM3/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 SMAJ15AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ15AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ15AHM3/I Tags
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