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Vishay General Semiconductor - Diodes Division SMAJ17AHE3/61
- Part No.:
- SMAJ17AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17AHE3/61.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ17AHE3/61 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 SMAJ17AHE3/61 datasheet, SMAJ17AHE3/61 pinout, SMAJ17AHE3/61 application, or SMAJ17AHE3/61 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM = 17 V and rapidly transitions to low-impedance conduction above VBR = 18.9–20.9 V to divert transient energy. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ps), while the SMA package supports thermal dissipation up to 3.3 W under infinite heatsink conditions at 50 °C ambient.
The device is rated for repetitive 10/1000 μs surges at 0.01 % duty cycle (400 W ≤78 V; 300 W >78 V), with IPPM = 14.5 A at VC = 27.6 V and reverse leakage <1.0 μA at VWM. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive under-hood applications.
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 operating margin for protected circuitry. |
| VBR (Breakdown Voltage) | 18.9–20.9 V at 1 mA - Voltage at which device enters avalanche conduction; ensures reliable triggering without premature clamping. |
| VC (Clamping Voltage) | 27.6 V at 14.5 A - Maximum voltage seen by protected load during 10/1000 μs transient; determines stress on downstream ICs or MOSFETs. |
| PPPM (Peak Pulse Power) | 400 W - Surge energy-handling capability with standard 10/1000 μs waveform; enables protection against ISO 7637-2 pulse 1/2a/5a in automotive systems. |
| IFSM (Surge Current) | 40 A - Peak forward surge current tolerance for 8.3 ms half-sine wave; supports handling of inductive switch-off transients in power circuits. |
| TJmax | 150 °C - Maximum junction temperature; allows operation in under-hood automotive environments and industrial enclosures without derating. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard PCB pad layout; informs thermal design margin for sustained power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., +12 V rail); conducts avalanche current to ground during overvoltage events. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop for unidirectional suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock per stress test requirements. |
| 400 W peak pulse power (10/1000 μs) | Enables compliance with ISO 7637-2 and IEC 61000-4-5 level 3/4 surge immunity without external series impedance. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress and high-temperature operation. |
| MSL Level 1 (260 °C peak reflow) | Supports lead-free reflow soldering without preconditioning; compatible with standard SMT production lines. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs and ICs. |
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 inductive switching transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and DC-DC input stage. Use Value: Limits transient voltage to ≤27.6 V during 14.5 A surges, preventing damage to upstream regulators and microcontrollers. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) of pressure sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and ground near connector entry point. Use Value: Clamps sub-100 ns ESD pulses to <28 V while adding <10 pF capacitance, preserving signal integrity up to 1 MHz bandwidth. |
| Consumer USB Port ESD Protection | Telecom Power Interface Protection |
|
Use Scenario: Secondary-level ESD protection on VBUS line of USB Type-A ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary fuse and upstream of USB power switch. Use Value: Withstands ±15 kV contact discharge (IEC 61000-4-2) and clamps to 27.6 V, preventing latch-up in USB controller ICs. |
Use Scenario: Overvoltage suppression on -48 V DC telecom power feeds entering base station equipment cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS oriented to clamp negative-going transients on return path. Use Value: Handles 400 W surges with 150 °C junction rating, enabling reliable operation in sealed, high-temperature telecom enclosures. |
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 package, but commercial-grade (non-AEC-Q101 qualified); RoHS-compliant, no halogen restriction. | Lacks automotive qualification; suitable for consumer/industrial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and qualification documentation is unnecessary. |
| SMAJ17CAHE3/61 | Bidirectional variant with identical VWM, VBR, and VC; symmetric clamping for AC-coupled or floating signal lines. | Used where bidirectional transients occur (e.g., RS-485, CAN bus), unlike unidirectional SMAJ17AHE3/61. | Choose only if circuit requires suppression of both positive and negative polarity surges - not a drop-in replacement. |
Compared with SMAJ17AHE3/61, the SMAJ17A-E3/61 offers identical performance at lower qualification cost, while SMAJ17CAHE3/61 provides bidirectional clamping essential for differential signaling - neither is pin-compatible without circuit redesign due to polarity and symmetry differences.
Availability
SMAJ17AHE3/61 is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial sensor interface hardening, and telecom DC feed protection requiring stable component supply, AEC-Q101 traceability, and full RoHS compliance.
Supply support for SMAJ17AHE3/61 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, and protection devices with emphasis on reliability, power efficiency, and automotive-grade validation.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness and standardized qualification are critical.
FAQ
What is the clamping voltage of SMAJ17AHE3/61 at its rated peak pulse current?
The SMAJ17AHE3/61 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 clamping performance is guaranteed across the full operating temperature range of −55 °C to +150 °C, making SMAJ17AHE3/61 suitable for under-hood automotive deployment.
Is SMAJ17AHE3/61 qualified to AEC-Q101, and what does that mean for automotive use?
Yes, SMAJ17AHE3/61 is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3". This qualification validates the device for use in automotive electronic modules subject to rigorous stress testing-including temperature cycling, high-temperature operating life, and mechanical shock-ensuring reliability in engine compartments and other demanding vehicle locations. SMAJ17AHE3/61 meets these requirements without derating, distinguishing it from commercial-grade variants like SMAJ17A-E3/61.
How does the SMAJ17AHE3/61 differ from the bidirectional SMAJ17CAHE3/61?
SMAJ17AHE3/61 is unidirectional with cathode marking and suppresses only positive transients relative to ground, whereas SMAJ17CAHE3/61 is bidirectional and clamps both polarities symmetrically. Their VWM, VBR, and VC values match, but SMAJ17CAHE3/61 lacks polarity marking and cannot replace SMAJ17AHE3/61 without modifying PCB layout and circuit grounding. SMAJ17AHE3/61 is appropriate for DC power rail protection; SMAJ17CAHE3/61 suits AC-coupled or floating signal paths like CAN or RS-485.
What is the thermal resistance and power dissipation capability of SMAJ17AHE3/61?
SMAJ17AHE3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W on standard 0.2" × 0.2" copper pads, and a steady-state power dissipation (PD) rating of 3.3 W at 50 °C ambient with infinite heatsink conditions. These parameters inform thermal layout decisions: for continuous operation, board-level copper area and airflow must maintain TJ ≤ 150 °C. The device's RθJL = 30 °C/W further supports localized heat transfer to PCB traces.
Can SMAJ17AHE3/61 be used in place of SMAJ15AHE3/61 or SMAJ18AHE3/61 without circuit changes?
No - SMAJ17AHE3/61 is not a direct substitute for SMAJ15AHE3/61 or SMAJ18AHE3/61 due to differences in standoff voltage (VWM = 17 V vs. 15 V or 18 V) and corresponding clamping behavior. Using a different VWM may cause premature conduction or insufficient protection margin. Each SMAJ variant is optimized for specific rail voltages; SMAJ17AHE3/61 is validated for 12 V nominal systems with ±20 % tolerance, and substitution requires verification of VBR, VC, and system-level surge profile.
SMAJ17AHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ17AHE3/61 FAQ
1.How can I place an order for SMAJ17AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17AHE3/61 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 SMAJ17AHE3/61 reliable?
The price and inventory of SMAJ17AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ17AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17AHE3/61?
SMAJ17AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17AHE3/61 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 SMAJ17AHE3/61?
For technical support, including SMAJ17AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17AHE3/61 requirements.
6.How does Aetrix verify that SMAJ17AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ17AHE3/61 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 SMAJ17AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ17AHE3/61?
All SMAJ17AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17AHE3/61, 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 SMAJ17AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ17AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ17AHE3/61 Tags
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