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Vishay General Semiconductor - Diodes Division SMAJ17A-E3/61
- Part No.:
- SMAJ17A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17A-E3/61.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ17A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode 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, and clamps transients to ≤27.6 V at 14.5 A peak pulse current (IPPM), delivering 400 W peak pulse power (10/1000 μs waveform) in compact SMA (DO-214AC) package - widely deployed on power rails and I/O lines of automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ17A-E3/61 datasheet, SMAJ17A-E3/61 pinout, SMAJ17A-E3/61 application, or SMAJ17A-E3/61 equivalent, key selection criteria include its unidirectional polarity, 1.0 μA max reverse leakage at VWM, 150 °C max junction temperature, AEC-Q101 qualification eligibility (via HE3 suffix variants), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
The SMAJ17A-E3/61 operates as a clamping-type TVS diode using an avalanche breakdown mechanism to divert surge energy away from protected circuitry. Its glass-passivated silicon junction ensures stable VBR tolerance (±5%), low incremental surge resistance, and fast response time (<1 ns) to ESD and lightning-induced transients.
Designed for single-polarity DC line protection, it exhibits forward conduction only when anode-to-cathode voltage exceeds ~3.5 V at 25 A (per spec note), while maintaining <1.0 μA leakage below 17 V. Thermal performance is characterized by RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, supporting reliable operation up to 150 °C junction temperature.
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 bias margin for protected line. |
| VBR (Breakdown Voltage) | 18.9–20.9 V at 1 mA - Confirmed avalanche initiation range; ensures predictable clamping onset under surge conditions. |
| VC (Clamping Voltage) | ≤27.6 V at 14.5 A (10/1000 μs) - Peak voltage seen by downstream IC during worst-case surge; critical for MOSFET/IC overvoltage margining. |
| IPPM (Peak Pulse Current) | 14.5 A - Maximum non-repetitive surge current the device can safely shunt without degradation; derived from 400 W rating. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs waveform) - Surge energy handling capacity; derates to 300 W above 78 V, but fully applicable at SMAJ17A-E3/61's 17 V rating. |
| TJmax | 150 °C - Maximum allowable junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Leakage (ID) | ≤1.0 μA at 17 V - Minimal standby power loss and signal integrity impact on low-power sensor or communication lines. |
Pinout & Package
Package: SMA (DO-214AC) - Surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0, MSL Level 1 (260 °C reflow), and JESD201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal under forward bias | Connected to lower-potential side (e.g., ground or return path); enables conduction during positive surges on cathode-side lines. |
| Cathode (banded end) | Current exit terminal under forward bias; high-impedance terminal under reverse bias until VBR | Connected to protected line (e.g., 12 V rail or CAN H); blocks normal operation but avalanches to clamp transients above VWM. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges on 12 V systems without external series impedance. |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage across temperature and humidity; eliminates risk of junction corrosion in harsh environments. |
| AEC-Q101 qualification option (HE3 suffix) | Validates reliability for automotive applications including engine control, body electronics, and ADAS sensor interfaces per stress test requirements. |
| Low profile SMA package | Supports high-density PCB layouts and automated pick-and-place; footprint compatible with industry-standard DO-214AC land patterns. |
| 0.01 % duty cycle rating | Allows repetitive surge handling in cyclic applications like motor drive commutation or relay switching without thermal runaway. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply inputs of engine control units (ECUs) against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and input filter capacitor, absorbing >400 W surges within nanoseconds. Use Value: Prevents latch-up or permanent damage to MCU power management ICs by limiting rail voltage to ≤27.6 V during 12 V system transients. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Reverse-biased TVS connected from signal line to ground, suppressing EFT bursts and inductive kickback from nearby solenoids. Use Value: Maintains sub-μA leakage at 17 V to avoid disturbing loop accuracy while clamping 14.5 A surges to preserve ADC front-end integrity. |
| Consumer USB Power Input Protection | Telecom Ethernet Port Surge Suppression |
|
Use Scenario: Securing 5 V USB Type-A port inputs in set-top boxes and smart home hubs against hot-plug and ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS installed between VBUS and GND, leveraging fast <1 ns response to meet IEC 61000-4-2 ±15 kV contact discharge immunity. Use Value: Delivers 400 W surge capability in minimal 2.5 mm × 4.3 mm footprint, enabling compact layout without sacrificing protection level. |
Use Scenario: Front-end protection of PoE-powered Ethernet PHYs (e.g., 10/100BASE-TX) in network switches and IP cameras. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices (one per differential pair) referenced to chassis ground, clamping common-mode surges induced on twisted pairs. Use Value: Low 1.0 μA leakage prevents DC bias shift on magnetics; 27.6 V clamping ensures PHY transceivers remain within absolute maximum ratings during lightning-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 |
|---|---|---|---|
| SMAJ17CA-E3/61 | Bidirectional variant; symmetric VBR (18.9–20.9 V) in both polarities; same VC, PPPM, and package. | Required for AC-coupled or floating signal lines (e.g., RS-485, audio) where polarity reversal or differential surges occur. | Select SMAJ17CA-E3/61 only when bidirectional clamping is mandated; SMAJ17A-E3/61 is preferred for DC rails with defined polarity. |
| SMBJ17A-E3/52 | Same electrical specs but in larger SMB (DO-214AA) package; 600 W PPPM rating (vs. 400 W); higher IPPM (24.5 A). | Used where higher surge margin or improved thermal dissipation is needed, e.g., in high-reliability industrial power supplies. | Choose SMBJ17A-E3/52 if board space allows and 600 W surge headroom is required; SMAJ17A-E3/61 optimizes cost and density for standard 400 W needs. |
Compared with SMAJ17CA-E3/61, the SMAJ17A-E3/61 offers polarity-specific protection with identical clamping performance but avoids unnecessary bidirectional complexity on DC lines; versus SMBJ17A-E3/52, it trades 200 W surge headroom for 30 % smaller footprint and lower assembly cost in space-constrained designs.
Availability
SMAJ17A-E3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, consumer USB power inputs, and telecom Ethernet ports requiring stable component supply, RoHS compliance, and SMT-ready packaging.
Supply support for SMAJ17A-E3/61 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, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-energy transient suppression in automotive, industrial, and communications systems - balancing compact size, repeatable clamping, and AEC-Q101 readiness for mission-critical electronics.
FAQ
What is the clamping voltage of SMAJ17A-E3/61 at its rated peak pulse current?
The SMAJ17A-E3/61 clamps to a maximum of 27.6 V when subjected to its rated 14.5 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured at TA = 25 °C on recommended 0.2" × 0.2" copper pads and defines the upper voltage limit imposed on protected circuitry during surge events - a critical parameter for ensuring downstream ICs remain within their absolute maximum ratings.
Is SMAJ17A-E3/61 suitable for automotive applications?
Yes, SMAJ17A-E3/61 is qualified for automotive use when ordered with the HE3 suffix (e.g., SMAJ17AHE3_A), which denotes full AEC-Q101 qualification. The base SMAJ17A-E3/61 variant is RoHS-compliant and commercial-grade; however, its electrical specs - including 150 °C TJmax, 400 W surge rating, and glass-passivated junction - align with automotive environmental stress requirements, making it a common choice for non-safety-critical ECU and infotainment subsystems.
How does the SMAJ17A-E3/61 differ from the SMAJ17CA-E3/61?
The SMAJ17A-E3/61 is unidirectional, with cathode marked by a band and functional only in reverse-bias clamping mode, whereas the SMAJ17CA-E3/61 is bidirectional - offering symmetric breakdown and clamping in both polarities with no polarity marking. Both share identical VWM (17 V), VBR (18.9–20.9 V), VC (≤27.6 V), and package (SMA), but SMAJ17CA-E3/61 is mandatory for AC signal lines or floating interfaces where voltage reversals occur.
What is the maximum reverse leakage current for SMAJ17A-E3/61 at its standoff voltage?
The SMAJ17A-E3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA when biased at its 17 V standoff voltage (VWM) and tested at TA = 25 °C. This ultra-low leakage ensures minimal power loss and negligible loading on protected circuits - especially critical in battery-powered sensor nodes and precision analog signal paths where standby current budget is tightly constrained.
Does SMAJ17A-E3/61 require a heatsink for standard operation?
No, SMAJ17A-E3/61 does not require an external heatsink under typical surge conditions because its thermal design relies on short-duration pulse dissipation rather than steady-state power handling. With a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W on standard 0.2" × 0.2" copper pads, and a maximum average power dissipation (PD) of only 3.3 W, it safely operates within its 150 °C junction limit during transient events - provided PCB layout follows Vishay's recommended pad dimensions.
SMAJ17A-E3/61 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ17A-E3/61 FAQ
1.How can I place an order for SMAJ17A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17A-E3/61 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 SMAJ17A-E3/61 reliable?
The price and inventory of SMAJ17A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ17A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17A-E3/61?
SMAJ17A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17A-E3/61 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 SMAJ17A-E3/61?
For technical support, including SMAJ17A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17A-E3/61 requirements.
6.How does Aetrix verify that SMAJ17A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ17A-E3/61 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 SMAJ17A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ17A-E3/61?
All SMAJ17A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17A-E3/61, 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 SMAJ17A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ17A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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