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Vishay General Semiconductor - Diodes Division SMAJ17CA-E3/61
- Part No.:
- SMAJ17CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17CA-E3/61.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,260
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Product details
Overview
SMAJ17CA-E3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 17 V standoff voltage (VWM), 18.9–20.9 V breakdown range (VBR at 1 mA), 27.6 V maximum clamping voltage (VC) at 14.5 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform), commonly deployed to protect MOSFET gates, sensor interfaces, and automotive ECUs against ESD and load dump.
For engineers reviewing the SMAJ17CA-E3/61 datasheet, SMAJ17CA-E3/61 pinout, SMAJ17CA-E3/61 application, or SMAJ17CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.62), AEC-Q101 qualification eligibility (via HE3 suffix variants), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (<1 μA leakage at 17 V), but triggers avalanche conduction when transient voltage exceeds VBR, limiting downstream voltage to ≤27.6 V at 14.5 A. Its bidirectional symmetry enables use on AC-coupled or floating lines without polarity concerns.
Thermal design relies on RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, supporting repetitive surge handling up to 0.01% duty cycle. The glass-passivated junction ensures stable breakdown characteristics and MSL Level 1 moisture sensitivity compliance (peak reflow 260 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 18.9 V / 20.9 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system nominal voltage. |
| VC @ IPPM | 27.6 V at 14.5 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 400 W - Peak pulse power rating (10/1000 μs); validates robustness against IEC 61000-4-5 Level 4 surges. |
| IFSM | 40 A - Non-repetitive forward surge current (8.3 ms half-sine); supports protection of unidirectional paths in hybrid circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with J-STD-020 reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional configuration - both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Either terminal conducts during positive or negative overvoltage events; no cathode band marking required for bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal lines without polarity constraints. |
| 400 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive electronics. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot across protected components, reducing risk of gate oxide rupture in MOSFETs. |
| MSL Level 1, 260 °C peak reflow | Supports lead-free reflow soldering without preconditioning; eliminates moisture-related popcorning failure. |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive-grade reliability validation in engine control and ADAS modules. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient clamp placed between signal line and ground, responding within <1 ns to limit voltage excursion. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V sensor interface ICs by clamping transients to ≤27.6 V while maintaining <1 μA leakage at 17 V. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers against induced surges from relay coil switching and motor drive noise. IC Role / Device Role / Timing Role: Bidirectional voltage limiter installed across input terminals to divert surge energy away from optocoupler or microcontroller GPIO pins. Use Value: Ensures uninterrupted operation during 4 kV contact discharge (IEC 61000-4-2) and 2 kV surge (IEC 61000-4-5) without requiring external series impedance. |
| Consumer Power Adapter Output | Telecom Line Interface |
|
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters and AC/DC wall adapters exposed to lightning-induced surges on DC output rails. IC Role / Device Role / Timing Role: Fast-acting crowbar element that activates before downstream DC-DC converter ICs reach absolute maximum ratings. Use Value: Limits 100 V transients to ≤27.6 V within nanoseconds, preserving integrity of 20 V-rated synchronous rectifier MOSFETs and feedback optocouplers. |
Use Scenario: Primary protection for Ethernet PHY interfaces and DSL line drivers subjected to longitudinal surges per GR-1089-CORE. IC Role / Device Role / Timing Role: Common-mode transient suppressor mounted between differential pair and chassis ground in RJ-45 magnetics module. Use Value: Maintains signal integrity with <1.5 pF junction capacitance at 0 V (per Fig. 4), avoiding data rate degradation in 10/100/1000BASE-T applications. |
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 | Unidirectional variant with cathode band marking; identical VWM, VBR, VC, and PPPM. | Requires polarity-aware layout; suitable only for DC-biased lines where reverse conduction must be blocked. | Select SMAJ17A-E3/61 only when protecting unidirectional signals (e.g., power supply rails) and polarity alignment is guaranteed. |
| SMBJ17CA-E3/52 | Same electrical specs but in SMB (DO-214AA) package - 3.99 mm × 4.50 mm footprint, 2.29 mm height, 100 W higher PPPM (600 W). | Higher surge margin supports harsher environments (e.g., railway traction control); requires larger PCB pad area. | Choose SMBJ17CA-E3/52 when system-level surge testing exceeds 400 W or when thermal derating demands lower RθJA. |
Compared with SMAJ17CA-E3/61, the unidirectional SMAJ17A-E3/61 offers identical clamping performance but mandates correct orientation, while the SMBJ17CA-E3/52 delivers 50% higher surge capacity in a slightly larger footprint - enabling trade-offs between board space, reliability margin, and layout flexibility.
Availability
SMAJ17CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and consumer power adapter output clamping requiring stable component supply, RoHS-compliant sourcing, and consistent tape-and-reel delivery.
Supply support for SMAJ17CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed for surface-mount transient suppression in space-constrained, high-reliability systems - targeting automotive, industrial, and telecom markets where fast response, repeatable clamping, and AEC-Q101 readiness are mandatory.
FAQ
What is the clamping voltage of SMAJ17CA-E3/61 at its rated peak pulse current?
The SMAJ17CA-E3/61 exhibits a maximum clamping voltage (VC) of 27.6 V when subjected to its rated peak pulse current (IPPM) of 14.5 A under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for downstream circuitry. The SMAJ17CA-E3/61 maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C).
Is SMAJ17CA-E3/61 suitable for automotive applications?
SMAJ17CA-E3/61 itself is commercial-grade (E3 suffix), but Vishay offers AEC-Q101 qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ17CAHE3_A). These variants undergo stress testing per AEC-Q101 Rev D and are approved for automotive powertrain and body electronics. The SMAJ17CA-E3/61 shares identical electrical and thermal specifications with its automotive counterparts - only qualification status and traceability differ. For production automotive use, specify SMAJ17CAHE3_A instead of SMAJ17CA-E3/61.
How does the bidirectional design of SMAJ17CA-E3/61 affect PCB layout?
The bidirectional nature of SMAJ17CA-E3/61 eliminates polarity constraints: no cathode band marking is present, and either terminal functions identically during positive or negative transients. This allows placement across AC-coupled lines, differential pairs, or floating grounds without orientation verification. Layout requires only two 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - matching the thermal and surge dissipation requirements specified in the SMAJ17CA-E3/61 datasheet. No silkscreen polarity indicator is needed.
What is the maximum leakage current of SMAJ17CA-E3/61 at its standoff voltage?
At its rated standoff voltage (VWM) of 17 V and ambient temperature of 25 °C, the SMAJ17CA-E3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA. This low leakage preserves signal integrity and minimizes standby power loss in battery-powered systems. Leakage remains below 5.0 μA up to +85 °C and is fully characterized per the Vishay Electrical Characteristics table (Document Number 88390, page 2), confirming suitability for precision analog and low-power IoT sensor nodes.
Can SMAJ17CA-E3/61 replace SMAJ15CA-E3/61 in an existing design?
SMAJ17CA-E3/61 is not a direct replacement for SMAJ15CA-E3/61 due to differing standoff and clamping voltages: SMAJ15CA-E3/61 has VWM = 15 V and VC = 24.4 V, while SMAJ17CA-E3/61 raises both to 17 V and 27.6 V respectively. Substituting without circuit review risks inadequate clamping headroom for 15 V systems or excessive voltage stress on 17 V-tolerant ICs. Verify that protected devices' absolute maximum ratings accommodate the higher VC before using SMAJ17CA-E3/61 in place of SMAJ15CA-E3/61.
SMAJ17CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ17CA-E3/61 FAQ
1.How can I place an order for SMAJ17CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17CA-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 SMAJ17CA-E3/61 reliable?
The price and inventory of SMAJ17CA-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 SMAJ17CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ17CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17CA-E3/61?
SMAJ17CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17CA-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 SMAJ17CA-E3/61?
For technical support, including SMAJ17CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ17CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ17CA-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 SMAJ17CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ17CA-E3/61?
All SMAJ17CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17CA-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 SMAJ17CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ17CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ17CA-E3/61 Tags
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