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Vishay General Semiconductor - Diodes Division SMAJ17CAHM3_A/H
- Part No.:
- SMAJ17CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17CAHM3_A/H.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,234
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Product details
Overview
SMAJ17CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features 17 V standoff voltage (VWM), 18.9–20.9 V breakdown voltage (VBR) at 1 mA, 400 W peak pulse power (10/1000 μs), and clamps to ≤27.6 V at 14.5 A peak surge current - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ17CAHM3_A/H datasheet, SMAJ17CAHM3_A/H pinout, SMAJ17CAHM3_A/H application, or SMAJ17CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, 120 °C/W junction-to-ambient thermal resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR over temperature and long-term reliability under repetitive surge stress.
The device complies with ANSI/IEEE C62.35 surge waveform standards and delivers low incremental surge resistance (<0.5 Ω typical), resulting in tight clamping performance during fast-rising transients such as ESD or inductive switching spikes. It is rated for operation from –55 °C to +150 °C and meets MSL Level 1 reflow requirements (peak 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 17 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown |
| VBR (Breakdown Voltage) | 18.9–20.9 V at 1 mA - precise voltage threshold where avalanche conduction initiates; ensures predictable turn-on during overvoltage events |
| VC (Clamping Voltage) | ≤27.6 V at IPPM = 14.5 A - maximum voltage seen by protected circuit during 10/1000 μs surge; critical for IC-level robustness |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - energy-handling capacity for single transient events; derates to 300 W above 78 V |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" PCB copper pads; determines power derating at elevated temperatures |
| IFSM | 40 A (8.3 ms half-sine) - unidirectional surge rating; not applicable to SMAJ17CAHM3_A/H due to bidirectional configuration |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive environments and high-temperature industrial enclosures |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Matte tin-plated leads, J-STD-002 solderable. No polarity marking for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Identical terminals; bidirectional operation means either terminal serves as anode or cathode depending on instantaneous polarity of surge |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal lines without external polarity management or series components |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for engine control, ADAS, and body electronics |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges with margin; supports robust design against load dump and inductive kickback |
| Low-profile SMA package | 0.208" × 0.157" footprint with 0.090" height - compatible with high-density PCB layouts and automated pick-and-place equipment |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C), eliminating bake requirements and streamlining manufacturing |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and ESD in vehicle cabins. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across signal pair or supply rail to shunt transients before they reach sensitive ASIC inputs. Use Value: Maintains signal integrity during 100 V/500 ms load dump events while preserving <1 μA leakage at 17 V operating voltage. |
Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input terminals, coordinated with series impedance and filtering to meet IEC 61000-4-4/5 immunity requirements. Use Value: Limits transient voltage to ≤27.6 V during 400 W surges, preventing damage to precision op-amps and ADC drivers without affecting DC accuracy. |
| Consumer USB Port Protection | Telecom Line Card Surge Suppression |
Use Scenario: Secondary-level protection on USB 2.0 D+/D− lines downstream of common-mode chokes in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp absorbing ESD (IEC 61000-4-2 ±15 kV contact) and cable discharge events. Use Value: Sub-1 ns response time and <15 pF junction capacitance prevent signal distortion while meeting USB eye diagram compliance. |
Use Scenario: Front-end transient suppression on POTS line interfaces in VoIP gateways and DSLAM line cards subjected to lightning-induced surges. IC Role / Device Role / Timing Role: First-stage voltage limiter before gas discharge tube (GDT) or silicon avalanche diode arrays in hybrid protection circuits. Use Value: Clamps induced surges to <28 V within nanoseconds, allowing downstream GDTs to extinguish follow-on current safely. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17CAHE3_A/H | Same electrical specs and AEC-Q101 qualification; RoHS-compliant but not halogen-free | Preferred for commercial/industrial designs where halogen-free requirement is not mandated | Select when cost optimization is prioritized and halogen-free material compliance is not required by end-customer specifications |
| SMBJ17CAHM3_A/H | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; 600 W PPPM rating | Better thermal dissipation and higher surge handling; requires larger PCB area and different pad layout | Choose when system-level surge testing exceeds 400 W or when board space allows larger footprint for enhanced margin |
Compared with SMAJ17CAHE3_A/H, the SMAJ17CAHM3_A/H adds halogen-free compliance without sacrificing AEC-Q101 qualification or clamping performance; versus SMBJ17CAHM3_A/H, it trades 200 W extra pulse power for 30% smaller PCB footprint and tighter layout integration.
Availability
SMAJ17CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC analog input conditioning, and telecom line card surge suppression requiring stable component supply across extended production lifecycles.
Supply support for SMAJ17CAHM3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets high-reliability transient suppression in automotive, industrial, and communications systems, with design focus on fast response, repeatable clamping, and robust SMT manufacturability.
FAQ
What is the polarity configuration of SMAJ17CAHM3_A/H?
SMAJ17CAHM3_A/H is a bidirectional TVS diode with symmetrical terminals - no cathode band marking is present. It conducts equally in both directions once the breakdown voltage is exceeded, making it ideal for protecting AC signals, differential pairs, or floating rails without polarity concerns. This behavior is confirmed in the "DEVICES FOR BIDIRECTION APPLICATIONS" section of the Vishay datasheet (Doc. #88390), where the "CA" suffix explicitly denotes bidirectional functionality.
Is SMAJ17CAHM3_A/H qualified for automotive applications?
Yes, SMAJ17CAHM3_A/H is AEC-Q101 qualified, as indicated by the "HM3" suffix per Vishay's ordering nomenclature (Document #88390, page 3). This qualification covers stress tests including HTGB, H3TRB, TC, and surge endurance, validating its suitability for under-hood and cabin electronics. The device is explicitly listed under "AEC-Q101 qualified available" in the FEATURES section, with automotive ordering codes defined as base P/NHM3_X.
What is the maximum clamping voltage of SMAJ17CAHM3_A/H at rated surge current?
The maximum clamping voltage (VC) of SMAJ17CAHM3_A/H is 27.6 V at a peak pulse current (IPPM) of 14.5 A, measured with a 10/1000 μs waveform. This value is specified in the ELECTRICAL CHARACTERISTICS table (page 2, Doc. #88390) for device SMAJ17CA. It represents the upper limit of voltage imposed on the protected circuit during worst-case surge conditions, directly informing system-level overvoltage margin analysis.
Does SMAJ17CAHM3_A/H require special PCB layout considerations?
Yes - Vishay specifies mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W pulse power (Document #88390, page 1). Smaller pads increase thermal resistance and reduce surge capability. The SMA (DO-214AC) package also requires adherence to the recommended pad dimensions shown on page 5, including 0.074" maximum width and 0.208" length, to ensure solder joint reliability and thermal performance.
How does the halogen-free status of SMAJ17CAHM3_A/H impact compliance?
SMAJ17CAHM3_A/H meets halogen-free requirements per IEC 61249-2-21, with total halogen content <900 ppm chlorine + bromine, verified through material categorization (www.vishay.com/doc?99912). This supports compliance with environmental directives including China RoHS II and certain OEM green procurement policies, without compromising electrical performance or AEC-Q101 qualification - distinguishing it from the non-halogen-free SMAJ17CAHE3_A/H variant.
SMAJ17CAHM3_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:
- -
- 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_A/H FAQ
1.How can I place an order for SMAJ17CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17CAHM3_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 SMAJ17CAHM3_A/H reliable?
The price and inventory of SMAJ17CAHM3_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 SMAJ17CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ17CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17CAHM3_A/H?
SMAJ17CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17CAHM3_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 SMAJ17CAHM3_A/H?
For technical support, including SMAJ17CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ17CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ17CAHM3_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 SMAJ17CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ17CAHM3_A/H?
All SMAJ17CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17CAHM3_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 SMAJ17CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ17CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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