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Vishay General Semiconductor - Diodes Division SMAJ17AHE3_A/I
- Part No.:
- SMAJ17AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17AHE3_A/I.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,613
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Product details
Overview
SMAJ17AHE3_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 standoff 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, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ17AHE3_A/I datasheet, SMAJ17AHE3_A/I pinout, SMAJ17AHE3_A/I application, or SMAJ17AHE3_A/I equivalent, this AEC-Q101 qualified TVS offers validated surge immunity for 12 V automotive systems, low-leakage reverse operation up to 17 V, fast sub-nanosecond response, and RoHS-compliant matte tin-plated leads compatible with J-STD-002 soldering standards.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal bias it presents <1.0 μA leakage at 17 V, then rapidly avalanches when transients exceed 18.9 V to clamp downstream circuitry at ≤27.6 V. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Thermally, it sustains 150 °C max junction temperature with 120 °C/W junction-to-ambient thermal resistance on standard 5.0 mm × 5.0 mm copper pads. The device meets MSL Level 1 per J-STD-020 and supports automated SMT placement with its low-profile SMA package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 17 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC operating margin. |
| VBR (Breakdown Voltage) | 18.9–20.9 V at 1 mA - Confirmed avalanche initiation range; ensures reliable triggering above system nominal voltage. |
| VC (Clamping Voltage) | 27.6 V at 14.5 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines IC survivability threshold. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability for standardized lightning/surge waveforms without failure. |
| IPPM (Peak Pulse Current) | 14.5 A - Maximum transient current diverted to ground while maintaining clamping performance. |
| TJmax | 150 °C - Absolute maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; optimized for high-density PCB layouts. |
Pinout & Package
Package: SMA (DO-214AC) - molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to protected line (e.g., 12 V rail); conducts during positive transients when cathode is biased higher. |
| Cathode | Reverse-biased terminal / Clamping reference | Connected to ground or lower-potential node; establishes clamping threshold relative to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive applications including engine control, body electronics, and ADAS sensors. |
| 400 W peak pulse power | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 surge events without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during clamping - critical for protecting 24 V tolerant but 30 V absolute-maximum ICs. |
| MSL Level 1 moisture sensitivity | Enables standard reflow without baking; compatible with high-volume SMT assembly at peak 260 °C. |
| 0.91 μA max reverse leakage at VWM | Negligible standby power loss in always-on automotive modules such as CAN transceivers and LIN nodes. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs of engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery rail and local regulator input. Use Value: Clamps transients to ≤27.6 V, preserving LDO integrity and preventing microcontroller brownout or latch-up. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector interface to divert ESD and switching noise. Use Value: Sub-1 nS response limits induced voltage spikes to <30 V, ensuring ADC reference stability and measurement accuracy. |
| Consumer USB Port ESD Protection | Telecom DC Power Input Protection |
Use Scenario: Safeguarding VBUS line in USB-C receptacles against human-body-model (HBM) and IEC 61000-4-2 contact discharge. IC Role / Device Role / Timing Role: Primary-level TVS on upstream side of USB power delivery controller. Use Value: Withstands ±15 kV air/±8 kV contact ESD pulses while adding <0.5 pF parasitic capacitance - no USB 2.0 signal integrity impact. |
Use Scenario: Front-end protection of -48 V telecom rectifier outputs against lightning-induced surges on central office equipment. IC Role / Device Role / Timing Role: Standoff-rated TVS in series with fuse and MOV for coordinated overvoltage staging. Use Value: 17 V VWM allows clean operation across -48 V ±10 % tolerance; 400 W rating handles multi-kA induced surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101). | Lacks automotive qualification; unsuitable for under-hood or safety-critical modules. | Select when cost-sensitive industrial or consumer designs do not require AEC-Q101 validation. |
| SMAJ17CAHE3_A/I | Bidirectional variant with identical VWM, VBR, and VC; symmetrical clamping in both polarities. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD differential pairs). | Choose for bidirectional protection where polarity reversal or AC transients are present. |
Compared with SMAJ17AHE3_A/I, SMAJ17A-E3/61 reduces qualification overhead but forfeits automotive reliability assurance, while SMAJ17CAHE3_A/I adds bidirectional symmetry at no clamping penalty - enabling reuse across single-ended and differential interfaces without redesign.
Availability
SMAJ17AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power input stages requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SMAJ17AHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series delivers standardized TVS protection for harsh-environment applications - engineered for rapid clamping, high surge endurance, and seamless integration into automotive, industrial, and communications power architectures.
FAQ
What is the clamping voltage of SMAJ17AHE3_A/I at its rated peak pulse current?
The SMAJ17AHE3_A/I has a maximum clamping voltage (VC) of 27.6 V at 14.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ17AHE3_A/I maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMAJ17AHE3_A/I qualified for automotive use?
Yes, SMAJ17AHE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet revision 09-Jan-2024. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and surge endurance - making SMAJ17AHE3_A/I suitable for under-hood and chassis-mounted automotive modules including body control units and ADAS domain controllers.
What is the standoff voltage rating of SMAJ17AHE3_A/I, and how does it relate to system design?
The SMAJ17AHE3_A/I has a standoff voltage (VWM) of 17 V, meaning it remains in high-impedance state below this DC or RMS voltage. In practice, this allows direct placement on 12 V automotive rails with 20 % tolerance (up to 14.4 V) and headroom for ripple and transients. Designers use VWM ≥ 1.2× nominal system voltage to prevent false triggering - confirming SMAJ17AHE3_A/I is correctly matched to 12 V systems.
Does SMAJ17AHE3_A/I have a specified junction capacitance?
No junction capacitance value is specified for SMAJ17AHE3_A/I in the official Vishay datasheet (Document Number: 88390). While typical TVS diodes in the SMAJ family exhibit low capacitance (<100 pF), the datasheet omits CJ for unidirectional variants like SMAJ17AHE3_A/I - indicating it is not characterized or guaranteed. For high-speed signal line protection, designers should verify layout parasitics or consider bidirectional variants with published capacitance curves.
What packaging and reel options are available for SMAJ17AHE3_A/I?
SMAJ17AHE3_A/I ships in 13-inch plastic tape-and-reel format (package code "I") with a base quantity of 7500 units per reel, as defined in Vishay's ordering information table. The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction, while "_A/I" specifies the reel size and orientation. This configuration supports high-volume SMT assembly with J-STD-002 compliant matte tin leads and MSL Level 1 handling.
SMAJ17AHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ17AHE3_A/I FAQ
1.How can I place an order for SMAJ17AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17AHE3_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 SMAJ17AHE3_A/I reliable?
The price and inventory of SMAJ17AHE3_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 SMAJ17AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ17AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17AHE3_A/I?
SMAJ17AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17AHE3_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 SMAJ17AHE3_A/I?
For technical support, including SMAJ17AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ17AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ17AHE3_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 SMAJ17AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ17AHE3_A/I?
All SMAJ17AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17AHE3_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 SMAJ17AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ17AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ17AHE3_A/I Tags
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