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Vishay General Semiconductor - Diodes Division SMAJ17AHM3/I
- Part No.:
- SMAJ17AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17AHM3/I.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,767
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Product details
Overview
SMAJ17AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. 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 rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ17AHM3/I datasheet, SMAJ17AHM3/I pinout, SMAJ17AHM3/I application, or SMAJ17AHM3/I equivalent, key selection criteria include unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device triggered by transient overvoltage events such as inductive load switching or ESD. Its glass-passivated junction enables fast response time (<1 ps) and low incremental surge resistance, ensuring reliable clamping before downstream components are damaged.
The SMAJ17AHM3/I is rated for -55 °C to +150 °C operating junction temperature, supports 40 A non-repetitive forward surge current (IFSM), and exhibits 0.090 %/°C temperature coefficient of VBR - critical for stable clamping performance across automotive under-hood thermal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 17 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 18.9–20.9 V at 1 mA - precise voltage threshold where avalanche conduction begins; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 27.6 V at 14.5 A IPPM - peak voltage seen by protected circuit during worst-case 10/1000 μs surge; determines stress on downstream ICs. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - energy-handling capability under standardized surge; sufficient for ISO 7637-2 Pulse 1/2a/5a automotive transients. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 0.208" × 0.157" footprint; optimized for high-density PCB layouts and reflow soldering. |
| Qualification | AEC-Q101 qualified & halogen-free - certified for automotive electronics; meets JESD201 Class 2 whisker resistance and MSL Level 1 (260 °C peak). |
| Thermal Resistance | RθJA = 120 °C/W - defines junction temperature rise per watt dissipated; requires minimum 0.2" × 0.2" copper pad per terminal for rated power handling. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, unidirectional configuration with cathode band marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return node; completes clamping loop during positive transients on cathode side. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 12 V rail or sensor output); avalanche conduction occurs from cathode to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 automotive load dump and inductive switching surges without derating below 78 V. |
| Glass passivated chip junction | Ensures stable avalanche characteristics, low leakage (<1 μA at VWM), and long-term reliability under thermal cycling. |
| AEC-Q101 qualified & HM3 suffix | Confirms suitability for automotive powertrain and body electronics; halogen-free construction meets strict environmental compliance requirements. |
| Low profile SMA package | Supports automated pick-and-place assembly and high-density routing; compatible with standard reflow profiles including peak 260 °C. |
| Fast response time & low clamping ratio | Sub-nanosecond turn-on and VC/VBR ≈ 1.45 ensure minimal overvoltage exposure to sensitive 3.3 V/5 V logic and analog front-ends. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients up to 120 V and 100 ms duration per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges before LDOs or DC-DC controllers. Use Value: Limits peak voltage to 27.6 V during 14.5 A surge, preventing latch-up or gate oxide damage in downstream PMICs and microcontrollers. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and cable discharge events in factory automation systems. IC Role / Device Role / Timing Role: TVS mounted directly at connector interface to shunt transients before signal conditioning op-amps or ADC inputs. Use Value: Clamps ±8 kV contact ESD (IEC 61000-4-2) to <30 V within <1 ns, preserving 16-bit measurement accuracy and avoiding system resets. |
| Consumer Device USB Port Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Safeguarding USB 2.0 data lines and VBUS against hot-plug induced transients and nearby lightning-induced coupling. IC Role / Device Role / Timing Role: Dual-SMAJ array (e.g., SMAJ5.0A + SMAJ17AHM3/I) protecting VBUS and D+/D− with coordinated clamping thresholds. Use Value: Maintains signal integrity by limiting VBUS overshoot to 27.6 V while enabling full-speed USB operation without added capacitance or insertion loss. |
Use Scenario: Front-end protection of Ethernet PHYs and PoE injectors against induced surges from outdoor cabling in telecom base stations. IC Role / Device Role / Timing Role: Primary clamping device on DC bias lines feeding active Ethernet magnetics; coordinated with GDT secondary protection. Use Value: Absorbs 400 W surge energy without degradation, sustaining >100,000 surge events per MIL-STD-883H Method 3015.8. |
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/I | Same electrical specs but RoHS-compliant commercial grade (E3), not AEC-Q101 qualified or halogen-free. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMAJ17AHE3/I for cost-sensitive non-automotive applications requiring identical clamping performance. |
| SMBJ17A-M3/5A | Higher 600 W PPPM rating, SMB (DO-214AA) package (larger footprint), same VWM/VBR/VC specs. | Better surge energy handling; requires larger PCB area and different pad layout than SMAJ17AHM3/I. | Choose SMBJ17A-M3/5A when system-level surge testing exceeds 400 W or when higher Ippm margin is required. |
Compared with SMAJ17AHE3/I, the SMAJ17AHM3/I adds AEC-Q101 qualification and halogen-free compliance for automotive use; compared with SMBJ17A-M3/5A, it trades 200 W pulse power headroom for 30 % smaller board area and tighter layout constraints.
Availability
SMAJ17AHM3/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer USB power delivery systems, and telecom line cards requiring stable component supply with guaranteed long-term manufacturability.
Supply support for SMAJ17AHM3/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 and application-specific performance.
The SMAJ series was engineered for high-reliability transient suppression in harsh environments - particularly targeting automotive, industrial, and telecom applications where consistent clamping behavior and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the SMAJ17AHM3/I under a 10/1000 μs surge?
The SMAJ17AHM3/I has a maximum clamping voltage (VC) of 27.6 V at 14.5 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per JEDEC standards and reflects the highest voltage imposed on the protected circuit during worst-case transient conditions. The SMAJ17AHM3/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), making it suitable for under-hood automotive applications.
Is the SMAJ17AHM3/I qualified for automotive use?
Yes, the SMAJ17AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - validating its reliability in automotive powertrain, body control, and ADAS modules. The SMAJ17AHM3/I also meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow requirements.
How does the SMAJ17AHM3/I differ from the SMAJ17A-E3/61?
The SMAJ17AHM3/I and SMAJ17A-E3/61 share identical electrical specifications (VWM = 17 V, VBR = 18.9–20.9 V, VC = 27.6 V), but differ in qualification and material content. The SMAJ17AHM3/I carries the HM3 suffix indicating halogen-free, RoHS-compliant, and AEC-Q101-qualified construction, whereas SMAJ17A-E3/61 is RoHS-compliant commercial grade (E3) without automotive qualification. Both use the same SMA (DO-214AC) package and are pin-compatible.
What is the thermal resistance of the SMAJ17AHM3/I, and how does it affect layout?
The SMAJ17AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value means each watt of transient power dissipated raises the junction temperature by 120 °C above ambient - so proper copper pour sizing is essential to avoid exceeding the 150 °C maximum junction temperature. Layout must follow Vishay's mounting pad dimensions in datasheet Figure 5 to achieve rated 400 W pulse power.
Can the SMAJ17AHM3/I be used in bidirectional configurations?
No, the SMAJ17AHM3/I is strictly a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. Bidirectional variants carry the "CA" suffix (e.g., SMAJ17CA). Using SMAJ17AHM3/I in reverse-biased configurations will result in forward conduction at ~0.7–1.0 V rather than symmetrical clamping - potentially damaging the device or failing to protect AC-coupled or differential signal lines. For bidirectional protection, select SMAJ17CA or equivalent.
SMAJ17AHM3/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):
- 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/I FAQ
1.How can I place an order for SMAJ17AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17AHM3/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/I reliable?
The price and inventory of SMAJ17AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ17AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17AHM3/I?
SMAJ17AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17AHM3/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/I?
For technical support, including SMAJ17AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17AHM3/I requirements.
6.How does Aetrix verify that SMAJ17AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ17AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ17AHM3/I?
All SMAJ17AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17AHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ17AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ17AHM3/I Tags
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