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Vishay General Semiconductor - Diodes Division SMAJ17CA-M3/61
- Part No.:
- SMAJ17CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17CA-M3/61.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ17CA-M3/61 from Vishay General Semiconductor is a bidirectional surface-mount 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 voltage (VBR) at 1 mA, 400 W peak pulse power (10/1000 μs), and clamps to ≤27.6 V at 14.5 A peak surge current - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line conditioning.
For engineers reviewing the SMAJ17CA-M3/61 datasheet, SMAJ17CA-M3/61 pinout, SMAJ17CA-M3/61 application, or SMAJ17CA-M3/61 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HM3 suffix), low incremental surge resistance, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 μA at VWM), while the SMA package supports high thermal dissipation via copper pad mounting per JESD22-B102 solderability standards.
The device delivers 400 W peak pulse power up to 78 V, derating to 300 W above that threshold, with clamping voltage tightly controlled across temperature (±0.090 %/°C VBR tempco). It meets MSL Level 1 per J-STD-020 and withstands 40 A non-repetitive forward surge (8.3 ms half-sine) in unidirectional mode - though SMAJ17CA-M3/61 itself is bidirectional and thus not rated for forward conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 17 V - maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 18.9–20.9 V at 1 mA - precise voltage at which avalanche conduction initiates; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | ≤27.6 V at IPPM = 14.5 A - peak voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream ICs |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - transient energy handling capacity under standardized waveform; critical for lightning/ESD immunity |
| ID (Max Reverse Leakage) | ≤1.0 μA at VWM - minimal standby current draw; preserves signal integrity and battery life in always-on systems |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood automotive or industrial enclosures |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad requirement for thermal performance |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional types; RoHS-compliant and halogen-free (M3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Bidirectional terminals - either lead serves as input/output; no cathode band marking; interchangeable in layout |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V/24 V rails without derating |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected MOSFET gates or MCU I/O pins during fast transients |
| MSL Level 1, 260 °C reflow compatible | Supports single-pass lead-free reflow without moisture-related popcorning or delamination |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills EU ELV and China RoHS requirements for automotive and industrial end equipment |
| 150 °C maximum junction temperature | Allows placement near heat-generating components (e.g., DC/DC converters) without thermal shutdown risk |
Applications
| Automotive Sensor Interfaces | Industrial PLC Analog Inputs |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and Hall-effect sensor outputs from load dump and inductive switching spikes in engine control units. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and ground, responding within <1 ps to suppress >100 V transients. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V sensor interface ICs while maintaining signal fidelity at 250 kbps+ data rates. |
Use Scenario: Shielding 4–20 mA current loop inputs in programmable logic controllers from field wiring ESD and motor drive coupling noise. IC Role / Device Role / Timing Role: Low-leakage shunt protector across input terminals, activated only during >17 V excursions to preserve loop accuracy. Use Value: Maintains <0.1 % full-scale error in analog measurement while surviving repeated 1 kV contact discharge events per IEC 61000-4-2. |
| Telecom Line Conditioning | Consumer USB Port Protection |
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE injectors against lightning-induced surges on outdoor telecom links. IC Role / Device Role / Timing Role: Primary-level TVS on secondary side of isolation transformers, clamping common-mode transients before choke saturation. Use Value: Limits induced voltage to <30 V during 10/700 μs telecom surges, preventing damage to 100BASE-TX transceivers and maintaining link integrity. |
Use Scenario: Adding secondary-stage overvoltage protection on USB 2.0 D+/D− lines in portable media players and docking stations. IC Role / Device Role / Timing Role: Symmetric bidirectional clamp between differential pair and chassis ground, absorbing ±15 kV air discharge per IEC 61000-4-2. Use Value: Eliminates false disconnects and data corruption during hot-plug events while adding <0.5 pF capacitance per line. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A-M3/61 | Unidirectional; cathode-marked; VF = 3.5 V @ 25 A (forward conduction supported) | Required where DC bias or polarity-sensitive circuits demand asymmetric clamping (e.g., power rail vs. signal line) | Select when protecting unidirectional power supplies or when forward conduction must be characterized |
| SMBJ17CA-M3/61 | Same VWM/VBR/VC specs but in SMB (DO-214AA) package; 600 W PPPM rating; larger footprint (5.3 mm × 4.6 mm) | Better thermal performance for high-duty-cycle surge environments; requires revised PCB land pattern | Choose for higher reliability in industrial motor drives where 600 W surge margin justifies added board area |
Compared with SMAJ17CA-M3/61, SMAJ17A-M3/61 adds forward conduction capability but removes symmetry needed for AC signals, while SMBJ17CA-M3/61 trades compactness for 50 % higher surge power - making SMAJ17CA-M3/61 optimal for space-constrained bidirectional protection where 400 W suffices.
Availability
SMAJ17CA-M3/61 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O conditioning, telecom line safeguarding, and consumer USB interface hardening requiring stable component supply across production lifecycles.
Supply support for SMAJ17CA-M3/61 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, MOSFETs, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMAJ series targets cost-effective, high-yield transient suppression in automotive, industrial, and communications systems - engineered for drop-in replacement of legacy TVS families while meeting AEC-Q101 and RoHS requirements.
FAQ
What is the clamping voltage of SMAJ17CA-M3/61 at its rated peak pulse current?
The SMAJ17CA-M3/61 clamps to a maximum of 27.6 V at its specified peak pulse current of 14.5 A (10/1000 μs waveform). This value is measured under standardized test conditions per ANSI/IEEE C62.35 and represents the highest voltage the protected circuit will experience during a worst-case transient event. The clamping voltage directly determines stress on downstream components like microcontrollers or transceivers, making it a critical parameter for system-level surge immunity design using the SMAJ17CA-M3/61.
Is SMAJ17CA-M3/61 qualified for automotive applications?
SMAJ17CA-M3/61 itself is not AEC-Q101 qualified, but Vishay offers the functionally identical SMAJ17CA-HM3/61 variant - same electrical specs and SMA package - with full AEC-Q101 qualification for automotive use. The "HM3" suffix denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. For automotive designs requiring qualification evidence, SMAJ17CA-HM3/61 is the recommended part; SMAJ17CA-M3/61 remains suitable for industrial and commercial applications where qualification is not mandated.
How does the bidirectional nature of SMAJ17CA-M3/61 affect its PCB layout?
The SMAJ17CA-M3/61 has no polarity marking and symmetrical terminal behavior, so either lead can connect to the protected line and the other to ground - eliminating orientation constraints during automated placement. This simplifies layout, reduces assembly errors, and enables use on AC-coupled or differential traces (e.g., RS-485, CAN) without concern for signal direction. Unlike unidirectional variants such as SMAJ17A-M3/61, no cathode band alignment is required, and the device functions identically regardless of mounting rotation on the SMA footprint.
What is the maximum reverse leakage current for SMAJ17CA-M3/61 at its standoff voltage?
The SMAJ17CA-M3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 17 V standoff voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage preserves signal integrity in high-impedance analog paths and minimizes quiescent power loss in battery-powered systems. Leakage remains below 5 μA up to +125 °C, ensuring reliable operation in under-hood or industrial environments without compromising protected circuit functionality - a key advantage over higher-leakage alternatives when used in precision sensor front-ends or low-power IoT nodes.
Can SMAJ17CA-M3/61 be used in place of SMAJ17A-M3/61?
No - SMAJ17CA-M3/61 and SMAJ17A-M3/61 are not interchangeable without circuit review. SMAJ17CA-M3/61 is bidirectional and lacks polarity marking, while SMAJ17A-M3/61 is unidirectional with a cathode band and supports forward conduction (VF = 3.5 V @ 25 A). Substituting SMAJ17CA-M3/61 for SMAJ17A-M3/61 in a DC-biased rail may allow unintended conduction during normal operation; conversely, using SMAJ17A-M3/61 on an AC signal line risks asymmetrical clamping. Always verify signal polarity and conduction requirements before selecting between "A" and "CA" variants of the SMAJ17 family.
SMAJ17CA-M3/61 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-M3/61 FAQ
1.How can I place an order for SMAJ17CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17CA-M3/61 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-M3/61 reliable?
The price and inventory of SMAJ17CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ17CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17CA-M3/61?
SMAJ17CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17CA-M3/61 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-M3/61?
For technical support, including SMAJ17CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ17CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ17CA-M3/61 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-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ17CA-M3/61?
All SMAJ17CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17CA-M3/61, 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-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ17CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ17CA-M3/61 Tags
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