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Vishay General Semiconductor - Diodes Division SMAJ17AHM3_A/I
- Part No.:
- SMAJ17AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17AHM3_A/I.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,545
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Product details
Overview
SMAJ17AHM3_A/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 17 V stand-off voltage (VWM), 18.9–20.9 V breakdown voltage (VBR) at 1 mA, 27.6 V maximum clamping voltage (VC) at 14.5 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed on power rails and I/O lines of automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ17AHM3_A/I datasheet, SMAJ17AHM3_A/I pinout, SMAJ17AHM3_A/I application, or SMAJ17AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), low incremental surge resistance, and verified clamping performance under repetitive 0.01% duty cycle transients.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, responding to positive-going transients on the anode-to-cathode path with sub-nanosecond response time. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 μA at 17 V), while the SMA package supports automated SMT placement and meets MSL Level 1 reflow profile (260 °C peak).
The device delivers 400 W peak pulse power up to 78 V, derating to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It is rated for -55 °C to +150 °C operating junction temperature and withstands 40 A non-repetitive forward surge (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse working voltage before clamping begins |
| VBR min/max | 18.9 V / 20.9 V at 1 mA - Ensures reliable turn-on within tight tolerance band during overvoltage events |
| VC @ IPPM | 27.6 V at 14.5 A - Clamped voltage seen by protected circuit under full-rated 10/1000 μs surge |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy absorption capability per JEDEC standard waveform |
| ID @ VWM | <1.0 μA - Minimal leakage current preserves signal integrity and battery life in always-on systems |
| TJ max | +150 °C - Enables operation in under-hood automotive and high-temperature industrial environments |
| Package | SMA (DO-214AC) - Industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal requirement |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Clamping output node | Connected to protected line; conducts avalanche current to ground during overvoltage |
| Anode | Reference/ground return | Typically tied to system ground or low-impedance return path for effective transient shunting |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress per JESD22 |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental compliance requirements without compromising surge robustness or thermal performance |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients common in load-dump and inductive switching scenarios |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage |
| Fast response time (<1 ns) | Engages before transient reaches damaging amplitude, critical for protecting fast-switching MOSFETs and microcontrollers |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs of engine control units (ECUs) against ISO 7637-2 pulse 1, 2a, and 5a transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp negative-going spikes and positive load-dump surges. Use Value: Maintains <27.6 V clamping during 14.5 A surge, preventing regulator overvoltage failure and ensuring ECU uptime during cranking and alternator regulation faults. | Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA loops) and digital I/O (CAN, LIN) of factory-floor sensors exposed to ESD and relay coil kickback. IC Role / Device Role / Timing Role: Point-of-entry TVS on each signal line, mounted directly at connector interface to minimize inductance before clamping. Use Value: Sub-1 ns response and <1 μA leakage preserve signal accuracy and enable fail-safe operation in SIL2-capable systems. |
| Consumer Power Adapter Input Protection | Telecom DC Power Feeding Protection |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home hubs and IoT gateways subjected to lightning-induced surges on mains-connected outputs. IC Role / Device Role / Timing Role: Unidirectional clamp on regulated 5 V or 12 V output rail, coordinated with upstream MOV and fuse. Use Value: 400 W rating absorbs multiple 10/1000 μs transients without degradation, supporting UL 62368-1 surge immunity requirements. | Use Scenario: Protecting PoE-powered devices (e.g., IP cameras, wireless APs) from voltage reversals and inductive transients on 48 V DC feeding lines. IC Role / Device Role / Timing Role: Bidirectional-capable design variant not applicable; this unidirectional part used on grounded-return side of isolated DC feed. Use Value: 17 V VWM aligns with PoE Class 3–4 under-voltage lockout thresholds, enabling graceful shutdown instead of catastrophic failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17AHE3_A/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Acceptable where halogen-free mandate is not enforced (e.g., non-EU commercial designs) | Select when cost sensitivity outweighs halogen-free requirement and full automotive qualification remains essential |
| SMAJ17A-M3/5A | Same halogen-free RoHS spec, but packaged in 13" reel (7500 pcs); no AEC-Q101 qualification | Suitable for industrial or consumer applications lacking automotive reliability validation | Choose for high-volume production where AEC-Q101 is unnecessary and larger reels reduce assembly changeover frequency |
Compared with SMAJ17AHM3_A/I, the HE3 variant trades halogen-free compliance for lower unit cost while retaining automotive qualification, whereas the M3/5A offers volume packaging and halogen-free materials but omits AEC-Q101-making the HM3 version uniquely suited for safety-critical, environmentally regulated automotive deployments.
Availability
SMAJ17AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor modules, and telecom power feeding circuits requiring stable component supply with guaranteed AEC-Q101 qualification and halogen-free compliance.
Supply support for SMAJ17AHM3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where consistent clamping performance and long-term stability under thermal and electrical stress are mandatory.
FAQ
What is the clamping voltage of SMAJ17AHM3_A/I at its rated peak pulse current?
The SMAJ17AHM3_A/I has a maximum clamping voltage (VC) of 27.6 V when subjected to its rated peak pulse current (IPPM) of 14.5 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees the protected downstream circuit will not experience more than 27.6 V during such a transient event. The SMAJ17AHM3_A/I maintains this clamping performance across its qualified operating temperature range.
Is SMAJ17AHM3_A/I qualified for automotive applications?
Yes, SMAJ17AHM3_A/I is AEC-Q101 qualified, meaning it has passed rigorous stress tests-including temperature cycling, highly accelerated life testing (HALT), and ESD robustness-required for use in automotive electronic systems. The "HM3" suffix confirms both halogen-free and RoHS-compliant construction, and the device is explicitly listed in Vishay's AEC-Q101 qualified product documentation. SMAJ17AHM3_A/I is approved for under-hood and cabin ECU applications.
What does the "HM3" suffix signify in SMAJ17AHM3_A/I?
The "HM3" suffix in SMAJ17AHM3_A/I indicates halogen-free, RoHS-compliant construction with matte tin-plated leads meeting J-STD-002 solderability standards. It also denotes compliance with JESD201 Class 2 whisker resistance and qualifies the device for AEC-Q101 automotive reliability testing. This distinguishes SMAJ17AHM3_A/I from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, but not halogen-free) variants. SMAJ17AHM3_A/I is fully traceable and intended for environmentally regulated markets.
Can SMAJ17AHM3_A/I be used in bidirectional configurations?
No, SMAJ17AHM3_A/I is a unidirectional TVS diode, identifiable by its cathode band marking and specified breakdown behavior only in the reverse direction. For bidirectional protection, Vishay offers the SMAJ17CA family (e.g., SMAJ17CAHM3_A/I), which provides symmetrical clamping in both polarities. Using SMAJ17AHM3_A/I in a bidirectional configuration would leave the forward-biased polarity unprotected and may lead to device failure. Always match the SMAJ17AHM3_A/I polarity to the protected circuit's grounding scheme.
What is the thermal resistance and recommended PCB layout for SMAJ17AHM3_A/I?
SMAJ17AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated power dissipation. The SMA (DO-214AC) package requires MSL Level 1 handling and supports peak reflow temperatures up to 260 °C. Proper pad sizing and copper pour are essential to maintain clamping performance during repetitive surge events. SMAJ17AHM3_A/I must not be operated beyond its 3.3 W steady-state power limit without adequate thermal relief.
SMAJ17AHM3_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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- 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)
SMAJ17AHM3_A/I FAQ
1.How can I place an order for SMAJ17AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17AHM3_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 SMAJ17AHM3_A/I reliable?
The price and inventory of SMAJ17AHM3_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 SMAJ17AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ17AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17AHM3_A/I?
SMAJ17AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17AHM3_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 SMAJ17AHM3_A/I?
For technical support, including SMAJ17AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ17AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ17AHM3_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 SMAJ17AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ17AHM3_A/I?
All SMAJ17AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17AHM3_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 SMAJ17AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ17AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ17AHM3_A/I Tags
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