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Vishay General Semiconductor - Diodes Division SMAJ17CA-M3/5A
- Part No.:
- SMAJ17CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17CA-M3/5A.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,871
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Product details
Overview
SMAJ17CA-M3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection 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), clamping voltage of 27.6 V at 14.5 A, and operates across –55 °C to +150 °C junction temperature. It protects MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ17CA-M3/5A datasheet, SMAJ17CA-M3/5A pinout, SMAJ17CA-M3/5A application, or SMAJ17CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, 27.6 V max clamping at rated surge current, SMA (DO-214AC) package compatibility with automated SMT placement, and halogen-free RoHS compliance per M3 suffix.
Technical Context
The SMAJ17CA-M3/5A employs a glass-passivated silicon avalanche junction optimized for fast response (<1 ps) to ESD and lightning-induced transients. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths.
Rated for 400 W peak pulse power (10/1000 μs waveform) up to 78 V and derated to 300 W above that threshold, it delivers stable clamping with low incremental surge resistance and a temperature coefficient of +0.090 %/°C for VBR, enabling predictable performance across automotive thermal ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing margin. |
| VBR (min/max) | 18.9 V / 20.9 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on without premature conduction. |
| VC @ IPPM | 27.6 V at 14.5 A - Clamped voltage during full-rated 400 W transient; determines protected circuit's maximum stress level. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge power handling with 10/1000 μs waveform; defines transient energy absorption capacity. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports rare high-energy fault events in power rails. |
| TJ Range | –55 °C to +150 °C - Full automotive-grade junction temperature operation; validated for under-hood and industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.93 mm footprint; compatible with standard reflow profiles (MSL Level 1). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements. Bidirectional construction has no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Identical bidirectional conduction; either terminal serves as input/output-no orientation required during placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses, or floating nodes without polarity constraints or external circuitry. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when mounted on 5 mm × 5 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during transients-critical for safeguarding 3.3 V or 5 V logic interfaces downstream. |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance for global automotive and industrial OEMs without compromising surge robustness. |
| AEC-Q101 qualification option | Available in HM3 variant (SMAJ17CA-HM3_X); enables drop-in use in automotive powertrain and body electronics. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary shunt clamp on main power rail, diverting surge current away from DC-DC converters and microcontrollers. Use Value: Clamps to 27.6 V within nanoseconds, preventing latch-up or permanent damage to 32-bit MCUs rated for ≤36 V absolute max. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA loops) and digital sensor lines (CAN, LIN) from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance (≈200 pF at 0 V) TVS placed directly at connector entry point. Use Value: Maintains signal integrity while suppressing ±15 kV contact ESD (IEC 61000-4-2) without distorting millivolt-level sensor signals. |
| Consumer USB Port Surge Suppression | Telecom DSL Line Transient Protection |
|
Use Scenario: Hardening USB 2.0 data lines (D+/D−) and VBUS against hot-plug surges and nearby lightning-induced coupling. IC Role / Device Role / Timing Role: Bidirectional shunt device placed adjacent to USB controller PHY, before ESD diode arrays. Use Value: Responds faster than integrated protection, limiting VBUS overshoot to <28 V during 1 A surge-within USB spec tolerance. |
Use Scenario: Front-end protection of ADSL/VDSL line drivers exposed to induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Primary coarse protection stage before transformer-coupled isolation and secondary TVS. Use Value: Absorbs >300 W common-mode surges while maintaining <1 nA leakage at 17 V-preserving line impedance and SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17CA-E3/5A | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable for commercial/industrial use where halogen-free mandate does not apply. | Select E3 if halogen content is unrestricted and cost sensitivity favors standard grade. |
| SMAJ17A-M3/5A | Unidirectional version; cathode-marked; same VWM, VBR, VC, and PPPM, but only conducts in reverse direction. | Required only for DC-biased lines where polarity is fixed and forward conduction must be blocked. | Choose SMAJ17A-M3/5A only when protecting unidirectional power rails with known polarity-otherwise SMAJ17CA-M3/5A offers broader flexibility. |
Compared with SMAJ17CA-E3/5A, the M3 variant adds halogen-free compliance without sacrificing surge rating or thermal performance; versus SMAJ17A-M3/5A, the CA version eliminates polarity dependency-reducing BOM count and layout risk in AC or floating designs.
Availability
SMAJ17CA-M3/5A is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O terminals, and telecom line card surge protection requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMAJ17CA-M3/5A 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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive qualification.
The SMAJ series targets board-level transient protection in harsh environments-designed specifically for high-energy surge immunity in automotive, industrial, and telecom infrastructure where failure is not an option.
FAQ
What is the clamping voltage of SMAJ17CA-M3/5A at its rated peak pulse current?
The SMAJ17CA-M3/5A clamps to a maximum of 27.6 V at its peak pulse current of 14.5 A (10/1000 μs waveform). This value is measured under standardized test conditions with 0.2" × 0.2" copper pads and defines the upper voltage limit imposed on protected circuitry during a full-rated transient event. The SMAJ17CA-M3/5A maintains this clamping performance across its operational temperature range.
Is SMAJ17CA-M3/5A suitable for automotive applications?
Yes-SMAJ17CA-M3/5A is halogen-free and RoHS-compliant, and an AEC-Q101 qualified version (SMAJ17CA-HM3_X) is available for automotive use. While the base M3 variant is commercial-grade, its –55 °C to +150 °C operating range, 400 W surge rating, and DO-214AC package make it widely deployed in non-safety-critical automotive subsystems such as infotainment power supplies and sensor hubs. The SMAJ17CA-M3/5A meets core environmental and thermal requirements for under-dash deployment.
How does SMAJ17CA-M3/5A differ from SMAJ17A-M3/5A?
SMAJ17CA-M3/5A is bidirectional, providing symmetrical clamping for AC signals or floating nodes, whereas SMAJ17A-M3/5A is unidirectional with a marked cathode and conducts only in reverse bias. Both share identical VWM (17 V), VBR, VC, and PPPM, but the CA version eliminates polarity-dependent layout constraints. For most general-purpose protection-including USB, CAN, and sensor lines-the SMAJ17CA-M3/5A offers greater design flexibility and reduced risk of misorientation.
What is the thermal resistance of SMAJ17CA-M3/5A from junction to ambient?
The typical junction-to-ambient thermal resistance (RθJA) of SMAJ17CA-M3/5A is 120 °C/W under standard mounting conditions (0.2" × 0.2" copper pads per terminal). This value assumes natural convection on a FR-4 PCB and informs derating calculations-e.g., at 75 °C ambient, maximum continuous power dissipation drops to ~2.1 W. The SMAJ17CA-M3/5A also exhibits RθJL = 30 °C/W to lead, supporting localized heat extraction via wide traces or thermal vias.
Does SMAJ17CA-M3/5A require a heatsink for 400 W surge handling?
No-SMAJ17CA-M3/5A achieves its 400 W peak pulse power rating (10/1000 μs) without a heatsink, relying on short-duration energy absorption by the silicon junction. The 400 W rating applies only to non-repetitive transients; continuous power dissipation is limited to 3.3 W at 50 °C ambient. Thermal design focuses on PCB copper area (minimum 5 mm × 5 mm per pad) rather than external heatsinking. The SMAJ17CA-M3/5A's 120 °C/W RθJA reflects this board-level thermal path, not forced-air or heatsink-assisted cooling.
SMAJ17CA-M3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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-M3/5A FAQ
1.How can I place an order for SMAJ17CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17CA-M3/5A 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 SMAJ17CA-M3/5A reliable?
The price and inventory of SMAJ17CA-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ17CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17CA-M3/5A?
SMAJ17CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17CA-M3/5A 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 SMAJ17CA-M3/5A?
For technical support, including SMAJ17CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ17CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ17CA-M3/5A 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 SMAJ17CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ17CA-M3/5A?
All SMAJ17CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17CA-M3/5A, 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 SMAJ17CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ17CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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