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Vishay General Semiconductor - Diodes Division SMAJ17CAHM3/H
- Part No.:
- SMAJ17CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17CAHM3/H.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,880
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Product details
Overview
SMAJ17CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 17 V standoff voltage (VWM), 18.9–20.9 V breakdown range (VBR at 1 mA), 400 W peak pulse power (10/1000 μs), clamping voltage of 27.6 V at 14.5 A, and operates across –55 °C to +150 °C junction temperature. It is used to protect MOSFETs, ICs, and sensor signal lines against ESD and inductive switching transients in automotive and industrial control systems.
For engineers reviewing the SMAJ17CAHM3/H datasheet, SMAJ17CAHM3/H pinout, SMAJ17CAHM3/H application, or SMAJ17CAHM3/H equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, clamping performance under surge, thermal resistance data (RθJA = 120 °C/W), and halogen-free RoHS-compliant construction - all critical for automotive-grade circuit protection design and BOM validation.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response (<1 ps) and low incremental surge resistance. Its symmetrical I-V characteristics enable identical clamping in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths.
Rated for 400 W peak pulse power (10/1000 μs waveform) up to 78 V and 300 W above that, it maintains stable clamping at 27.6 V while conducting 14.5 A, with a maximum reverse leakage of 1.0 μA at 17 V. The device meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe signal swing margin. |
| VBR (min/max) | 18.9 V / 20.9 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 27.6 V at 14.5 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge energy handling capability; defines survivability against lightning/inductive spikes. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); relevant for unidirectional variants only; not applicable here. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs board-level thermal design. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Bidirectional construction has no polarity marking; terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity event) | Conducts during negative-going surges; forms symmetrical path with cathode for bidirectional clamping. |
| Cathode | Transient current entry (positive polarity event) | Conducts during positive-going surges; paired with anode to provide identical clamping in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for global automotive and industrial OEMs without compromising surge robustness. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients common in 12 V/24 V vehicle power nets and industrial motor drives. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during clamping, reducing risk of downstream IC latch-up or damage. |
| MSL Level 1, 260 °C peak reflow | Enables compatibility with standard lead-free SMT assembly processes without moisture sensitivity concerns. |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load dump and alternator ripple in 12 V vehicle networks. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across power rail or signal line to shunt surge energy before it reaches sensitive analog front-ends. Use Value: Maintains 17 V standoff while clamping to 27.6 V during 14.5 A transients, preserving signal integrity and preventing reset events in ECUs. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors in PLC modules from ESD and relay coil kickback. IC Role / Device Role / Timing Role: Fast-acting TVS placed at sensor connector interface to absorb sub-100 ns ESD pulses and longer inductive spikes. Use Value: Sub-nanosecond response and 1.0 μA leakage at 17 V ensure minimal impact on sensor accuracy and long-term reliability in harsh factory environments. |
| Consumer Device USB Port Protection | Telecom Equipment DC Power Input |
|
Use Scenario: Safeguarding USB 2.0 data lines and VBUS in portable medical monitors against user-handling ESD. IC Role / Device Role / Timing Role: Bidirectional TVS mounted directly at USB connector to divert ±8 kV contact discharge per IEC 61000-4-2. Use Value: Symmetrical clamping ensures equal protection on D+ and D− lines without polarity constraints, simplifying layout and reducing component count. |
Use Scenario: Front-end surge suppression on 48 V DC input of VoIP gateways exposed to telecom central office transients. IC Role / Device Role / Timing Role: Primary TVS stage absorbing bulk surge energy before secondary regulation and filtering stages. Use Value: 400 W rating and 27.6 V clamping limit upstream voltage excursion, enabling use of lower-voltage-rated downstream capacitors and regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17CAHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable for commercial automotive modules where halogen-free is not mandated by Tier 1 spec. | Select when cost sensitivity outweighs halogen-free requirement; identical footprint and performance. |
| SMBJ17CAHM3 | Same VWM/VC, but SMB (DO-214AA) package - 2.5 mm wider, higher PPPM (600 W), RθJA = 85 °C/W. | Better thermal performance and surge margin; requires larger PCB pad area and different tape/reel packaging. | Choose when higher surge endurance or improved thermal dissipation is required; not drop-in due to larger footprint. |
Compared with SMAJ17CAHM3/H, SMAJ17CAHE3/H offers identical protection performance without halogen-free assurance, while SMBJ17CAHM3 provides higher surge capacity and better thermal management at the cost of increased board space - making SMAJ17CAHM3/H optimal for space-constrained AEC-Q101-compliant designs needing halogen-free compliance.
Availability
SMAJ17CAHM3/H is available at Aetrix Electronics and suitable for automotive control units, industrial sensor interfaces, and telecom power inputs requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for SMAJ17CAHM3/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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMAJ series is engineered for robust transient suppression in demanding environments - particularly targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMAJ17CAHM3/H and how is it measured?
The clamping voltage (VC) of SMAJ17CAHM3/H is 27.6 V, measured at a peak pulse current (IPPM) of 14.5 A using a 10/1000 μs double-exponential waveform per IEC 61000-4-5. This value reflects the maximum voltage seen across the device during standardized surge testing and directly determines the protection level afforded to downstream components. The SMAJ17CAHM3/H achieves this clamping while maintaining bidirectional symmetry and low thermal resistance.
Is SMAJ17CAHM3/H suitable for automotive applications?
Yes, SMAJ17CAHM3/H is AEC-Q101 qualified and specifically designed for automotive use. Its halogen-free (HM3) construction, MSL Level 1 rating, 150 °C maximum junction temperature, and validated performance under load dump and ISO 7637-2 transients make it appropriate for engine control units, body electronics, and ADAS sensor interfaces. The "HM3" suffix confirms full compliance with automotive environmental and reliability standards.
How does the bidirectional configuration of SMAJ17CAHM3/H affect its circuit placement?
The bidirectional configuration of SMAJ17CAHM3/H eliminates polarity constraints - it can be placed across any two nodes requiring symmetrical overvoltage protection, such as AC-coupled signal lines, differential buses (e.g., CAN, LIN), or floating power rails. Unlike unidirectional TVS diodes, SMAJ17CAHM3/H has no cathode band marking and conducts identically in both directions, simplifying layout, reducing inventory SKUs, and avoiding orientation errors during automated assembly.
What is the thermal resistance of SMAJ17CAHM3/H and why does it matter?
SMAJ17CAHM3/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. This value quantifies how effectively heat generated during surge events dissipates into the PCB. A lower RθJA improves reliability under repetitive transients; designers must ensure adequate copper area and avoid thermal bottlenecks to maintain safe junction temperatures below 150 °C during operation.
Does SMAJ17CAHM3/H meet RoHS and halogen-free requirements?
Yes, SMAJ17CAHM3/H is both RoHS-compliant and halogen-free, as confirmed by the "HM3" suffix per Vishay's ordering nomenclature. It satisfies JEDEC JS709E and IEC 61249-2-21 standards for bromine and chlorine content (<900 ppm each) and is certified for use in environmentally regulated markets including EU automotive supply chains. This makes SMAJ17CAHM3/H suitable for Tier 1 OEMs mandating full material compliance documentation.
SMAJ17CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ17CAHM3/H FAQ
1.How can I place an order for SMAJ17CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17CAHM3/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 SMAJ17CAHM3/H reliable?
The price and inventory of SMAJ17CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ17CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17CAHM3/H?
SMAJ17CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17CAHM3/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 SMAJ17CAHM3/H?
For technical support, including SMAJ17CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17CAHM3/H requirements.
6.How does Aetrix verify that SMAJ17CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ17CAHM3/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 SMAJ17CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ17CAHM3/H?
All SMAJ17CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17CAHM3/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 SMAJ17CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ17CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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