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Vishay General Semiconductor - Diodes Division SMAJ17-E3/5A
- Part No.:
- SMAJ17-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17-E3/5A.pdf
- Description:
- TVS DIODE 17VWM 30.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,563
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Product details
Overview
SMAJ17-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on DC power rails and signal lines. It features a 17 V standoff voltage (VWM), 30.5 V maximum clamping voltage (VC) at 13.1 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting MOSFETs and ICs in industrial power supplies.
For engineers reviewing the SMAJ17-E3/5A datasheet, SMAJ17-E3/5A pinout, SMAJ17-E3/5A application, or SMAJ17-E3/5A equivalent, key selection criteria include unidirectional polarity, 1.0 µA max reverse leakage at VWM, 18.9–23.1 V breakdown range, 150 °C max junction temperature, and RoHS-compliant matte tin-plated leads per J-STD-002.
Technical Context
This TVS diode operates as a voltage-clamping protection device in parallel with sensitive circuit nodes. Its glass-passivated junction enables fast response (<1 ps) to ESD and surge events, while low incremental surge resistance ensures minimal voltage overshoot during transient suppression.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive load dump) when used with appropriate PCB layout. It is rated for repetitive surges at 0.01% duty cycle and derates linearly above 25 °C ambient per Fig. 2 of document 88390.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 18.9 V / 23.1 V at 1.0 mA - Confirmed breakdown threshold range; ensures reliable turn-on under surge conditions. |
| VC @ IPPM | 30.5 V at 13.1 A - Clamped voltage seen by protected device during 10/1000 µs surge; determines downstream overvoltage stress. |
| PPPM | 400 W - Peak pulse power handling capability; supports single-event surge energy up to 400 mJ (10/1000 µs). |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inrush or fault currents. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in high-ambient industrial environments with proper thermal pad design. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on 0.2 × 0.2" copper pads; informs heatsinking requirements for sustained surge duty. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, unidirectional configuration with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential node; completes clamping path during reverse transient. |
| Cathode (banded end) | High-side connection point | Connected to protected line (e.g., +12 V rail); conducts avalanche current when VLINE exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche performance and long-term reliability under repeated surge stress. |
| MSL Level 1 (260 °C) | Compatible with standard SMT reflow profiles without moisture sensitivity concerns or baking requirement. |
| RoHS-compliant matte tin plating | Ensures solderability per J-STD-002 and eliminates whisker risk (JESD 201 Class 1A). |
| 400 W peak pulse power (≤78 V) | Provides sufficient energy absorption for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge testing on 24 V systems. |
| Low 1.0 µA reverse leakage @ VWM | Minimizes standby power loss in battery-powered or low-quiescent-current applications. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Suppresses load-dump transients (ISO 7637-2 Pulse 5a) on 12 V input rails of programmable logic controllers. IC Role / Device Role: Unidirectional shunt clamp placed between input rail and chassis ground. Use Value: Limits voltage excursion to ≤30.5 V during 13.1 A surge, preventing damage to upstream DC-DC controllers and microcontrollers. |
Use Scenario: Protects LIN bus transceivers and sensor inputs from coupled noise during alternator switching events. IC Role / Device Role: Localized TVS on each LIN node's VCC and data line. Use Value: Maintains signal integrity with <1.0 µA leakage at 12 V nominal, avoiding false wake-up or bias shift in low-power sleep modes. |
| Consumer Appliance Motor Drive | Telecom PoE Interface |
Use Scenario: Guards gate drivers and bootstrap circuits in BLDC motor inverters against inductive kickback from brushed DC motors. IC Role / Device Role: Clamp across high-side FET source-to-drain or supply rail-to-ground. Use Value: Fast <1 ps response captures sub-microsecond spikes before MOSFET avalanche failure occurs. |
Use Scenario: Shields IEEE 802.3af/at PD controller ICs from Ethernet cable ESD (IEC 61000-4-2 ±8 kV contact) and surge coupling. IC Role / Device Role: Secondary-level protection after common-mode choke, placed on powered device side. Use Value: 30.5 V clamping ensures protected ICs (e.g., TPS2375) remain within absolute maximum ratings during worst-case surge. |
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-E3/5A | Lower VBR range (18.9–20.9 V), tighter tolerance; 27.6 V clamping at 14.5 A. | Better suited for precision 17 V rail protection where lower clamping voltage is critical. | Select SMAJ17A-E3/5A when system margin below 30 V is constrained and tighter VBR distribution is required. |
| SMBJ17-E3/5A | Same electrical specs but SMB (DO-214AA) package; 5.3 mm × 4.6 mm footprint vs. SMA's 4.5 mm × 2.79 mm. | Higher thermal mass and 600 W PPPM rating; requires larger PCB area. | Choose SMBJ17-E3/5A only if higher surge endurance (>400 W) or improved thermal dissipation is needed and board space permits. |
Compared with SMAJ17A-E3/5A, the SMAJ17-E3/5A offers higher clamping voltage but broader VBR tolerance - advantageous where surge energy dominates over precise voltage limiting. Against SMBJ17-E3/5A, it trades power handling for compact size and lower profile, making it optimal for space-constrained industrial modules.
Availability
SMAJ17-E3/5A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, consumer appliance motor drives, and telecom PoE interfaces requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ17-E3/5A 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust, low-leakage transient suppression in harsh electromagnetic environments - including factory automation, vehicle ECUs, and outdoor telecom infrastructure.
FAQ
What is the polarity configuration of SMAJ17-E3/5A?
SMAJ17-E3/5A is a unidirectional TVS diode, with the cathode identified by a band on the SMA package body. It conducts only when the anode is negative relative to the cathode, making it suitable for DC rail protection where polarity is fixed. This differs from bi-directional variants (e.g., SMAJ17CA) that suppress surges regardless of polarity.
Does SMAJ17-E3/5A meet automotive qualification standards?
SMAJ17-E3/5A is RoHS-compliant and rated for industrial temperature range (−55 °C to +150 °C), but it is not AEC-Q101 qualified. For automotive-grade applications, Vishay offers the SMAJ17HE3/5A variant - which carries the HE3 suffix and is explicitly qualified to AEC-Q101. Always verify qualification status via the full part number before automotive deployment.
What is the maximum clamping voltage of SMAJ17-E3/5A under surge conditions?
The maximum clamping voltage of SMAJ17-E3/5A is 30.5 V, measured at 13.1 A peak pulse current (IPPM) using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
Can SMAJ17-E3/5A be used in bidirectional signal line protection?
No - SMAJ17-E3/5A is unidirectional and unsuitable for AC or bidirectional signal lines (e.g., RS-485, USB D+/D−). For such applications, use the bi-directional SMAJ17CA variant, which exhibits symmetric clamping in both polarities and has identical VWM and VC values for positive and negative transients.
What PCB pad layout is recommended for optimal thermal performance of SMAJ17-E3/5A?
Vishay specifies a minimum 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pad area per terminal for SMAJ17-E3/5A to achieve the rated 400 W peak pulse power and 120 °C/W thermal resistance. Reducing pad size degrades surge capability and increases junction temperature - consult Figure 5 and Table "Thermal Characteristics" in document 88390 for derating curves.
SMAJ17-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.5V
- Current - Peak Pulse (10/1000µs):
- 13.1A
- 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)
SMAJ17-E3/5A FAQ
1.How can I place an order for SMAJ17-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17-E3/5A 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 SMAJ17-E3/5A reliable?
The price and inventory of SMAJ17-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ17-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17-E3/5A?
SMAJ17-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17-E3/5A 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 SMAJ17-E3/5A?
For technical support, including SMAJ17-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17-E3/5A requirements.
6.How does Aetrix verify that SMAJ17-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ17-E3/5A 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 SMAJ17-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ17-E3/5A?
All SMAJ17-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17-E3/5A, 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 SMAJ17-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ17-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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