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Vishay General Semiconductor - Diodes Division SMCJ17A-M3/9AT
- Part No.:
- SMCJ17A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ17A-M3/9AT.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ17A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 17 V standoff voltage (VWM), 27.6 V maximum clamping voltage (VC) at 54.3 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 µs waveform), commonly deployed in automotive power supply input stages and industrial sensor interface circuits.
For engineers reviewing the SMCJ17A-M3/9AT datasheet, SMCJ17A-M3/9AT pinout, SMCJ17A-M3/9AT application, or SMCJ17A-M3/9AT equivalent, key selection criteria include verified unidirectional clamping performance, halogen-free RoHS-compliant construction (M3 suffix), junction temperature rating up to +150 °C, and compatibility with automated SMT placement on standard PCB pad layouts per JEDEC DO-214AB footprint.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 17 V), but rapidly transitions to low-impedance conduction when reverse voltage exceeds its 18.9–20.9 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable parametric behavior across temperature and lifetime.
The device delivers fast response (<1 ns) to transients and maintains low incremental surge resistance, enabling effective suppression of ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and lightning-induced surges (IEC 61000-4-5) without latch-up or degradation. Thermal resistance (RθJA = 75 °C/W) supports operation on standard 8 mm × 8 mm copper pads without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 17 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 12 V systems. |
| VBR (Breakdown Voltage) | 18.9–20.9 V at 1 mA - Confirmed voltage threshold where clamping initiates; tight tolerance enables predictable protection onset. |
| VC (Clamping Voltage) | 27.6 V at 54.3 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 1500 W - Sustained energy absorption capability for standardized surge waveforms; validates suitability for automotive load-dump immunity. |
| IPPM (Peak Pulse Current) | 54.3 A - Maximum non-repetitive surge current handled without failure; correlates directly with PCB trace sizing and fuse coordination. |
| TJmax | +150 °C - Maximum junction temperature rating; supports under-hood automotive environments and high-ambient industrial enclosures. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm body and 2.62 mm lead spacing; compatible with IPC-7351B footprint. |
Pinout & Package
SMCJ17A-M3/9AT uses the SMC (DO-214AB) package: a rectangular surface-mount case with two coplanar matte tin-plated leads, cathode identified by a band on the body end. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per Vishay's thermal derating guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail); polarity marking ensures correct orientation to avoid forward conduction in normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | M3 suffix confirms compliance with JEDEC J-STD-201 Class 2 whisker resistance and IEC 61249-2-21 halogen limits - required for automotive Tier-1 supply chains. |
| Low incremental surge resistance | Enables tighter clamping (27.6 V at 54.3 A) versus higher-resistance alternatives - reduces voltage overshoot on sensitive MCU I/O or CAN transceivers. |
| MSL Level 1 moisture sensitivity | Rated for unlimited floor life at ≤30 °C/85 % RH - eliminates bake-out requirement prior to reflow, reducing manufacturing cost and risk. |
| Glass passivated junction | Ensures stable VBR and leakage over 1000+ thermal cycles and 15-year field life - critical for automotive and industrial reliability targets. |
| AEC-Q101 qualification option | Available in HM3 variant (e.g., SMCJ17AHM3/9AT) - validated for automotive-grade temperature cycling, HTRB, and ESD testing per AEC-Q101 Rev D. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against ISO 7637-2 pulse 1 (inductive switch-off) and pulse 5a (load dump). IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground, clamping transients within 1 ns. Use Value: Limits voltage to ≤27.6 V during 54.3 A surges, preventing damage to downstream PMICs and microcontrollers rated for 30 V absolute max. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA loops) and digital interfaces (e.g., RS-485) in factory automation sensors exposed to motor switching noise. IC Role / Device Role / Timing Role: Low-capacitance (typ. 150 pF at 0 V) unidirectional clamp on signal lines referenced to local ground. Use Value: Maintains signal integrity with <1 µA leakage at 17 V while suppressing ±1 kV EFT bursts without false triggering or data corruption. |
| Consumer Power Adapter Output Protection | Telecom DC Power Feeds |
|
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters supplying USB-C PD or PoE-powered devices. IC Role / Device Role / Timing Role: Standoff-rated TVS on regulated 5–20 V output rails, absorbing residual switching spikes and hot-plug transients. Use Value: Withstands 1500 W surges without degradation, ensuring adapter compliance with UL 62368-1 Annex G and IEC 62368-1 Clause 5.6.2. |
Use Scenario: Front-end protection of -48 V telecom rectifier outputs feeding base station radios and optical modules. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to negative rail, handling repetitive surges from lightning-induced ground potential rise. Use Value: 1500 W rating and +150 °C TJ support continuous operation in sealed outdoor cabinets with ambient temperatures up to +85 °C. |
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-M3/9AT | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC specs but reduced surge margin. | Suitable only for low-energy transients (e.g., board-level ESD); insufficient for automotive load dump or industrial motor switching. | Select when space-constrained and surge energy is limited to <400 W - verify IPPM derating curves match system requirements. |
| SMCJ17CA-M3/9AT | Bidirectional version: symmetric VBR (18.9–20.9 V), same VC (27.6 V), identical package and power rating. | Required for AC-coupled or floating signal lines (e.g., Ethernet PHY, audio inputs) where polarity reversal occurs. | Choose for bidirectional protection needs; note absence of polarity marking and doubled ID limit per spec note (3). |
Compared with SMAJ17A-M3/9AT, SMCJ17A-M3/9AT provides 275 % higher surge power headroom and superior thermal dissipation; compared with SMCJ17CA-M3/9AT, it offers polarity-specific clamping essential for DC power rails where reverse conduction must be avoided.
Availability
SMCJ17A-M3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power feed applications requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified traceability pathways.
Supply support for SMCJ17A-M3/9AT 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 SMCJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and long-term parametric stability are mandatory.
FAQ
What is the maximum clamping voltage of the SMCJ17A-M3/9AT under a 10/1000 µs surge?
The SMCJ17A-M3/9AT has a maximum clamping voltage (VC) of 27.6 V when subjected to its rated peak pulse current of 54.3 A using the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88394. The SMCJ17A-M3/9AT maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Does the SMCJ17A-M3/9AT meet automotive qualification standards?
The SMCJ17A-M3/9AT itself is commercial-grade and halogen-free (M3 suffix), but Vishay offers an AEC-Q101-qualified variant under the ordering code SMCJ17AHM3/9AT. The SMCJ17A-M3/9AT shares identical electrical and thermal characteristics with the HM3 version, differing only in test documentation and traceability - making it suitable for pre-qualification design-in or non-safety-critical automotive subsystems where full AEC-Q101 certification is not mandated.
How does the M3 suffix affect the SMCJ17A-M3/9AT's compliance profile?
The M3 suffix on SMCJ17A-M3/9AT indicates halogen-free, RoHS-compliant construction meeting JEDEC J-STD-201 Class 2 whisker resistance and IEC 61249-2-21 halogen limits (Br < 900 ppm, Cl < 900 ppm, total halogens < 1500 ppm). It also confirms matte tin plating compliant with J-STD-002 and JESD 22-B102 solderability standards - critical for lead-free reflow processes in high-reliability manufacturing.
What is the thermal resistance of the SMCJ17A-M3/9AT, and how does it impact PCB layout?
The SMCJ17A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain junction temperature below +150 °C during repeated surges, PCB layout must adhere to this minimum pad area; reducing pad size increases RθJA and risks thermal runaway. The SMCJ17A-M3/9AT does not require heatsinking for single-event protection but benefits from internal plane connectivity for sustained duty cycles.
Can the SMCJ17A-M3/9AT be used in bidirectional signal protection?
No - the SMCJ17A-M3/9AT is strictly unidirectional and must be oriented with its cathode band toward the protected line. For bidirectional signal paths (e.g., RS-485, USB D+/D−, or AC-coupled audio), the SMCJ17CA-M3/9AT is the correct variant. Using SMCJ17A-M3/9AT in reverse-biased configurations will result in forward conduction and potential failure; its datasheet explicitly defines polarity and prohibits AC or floating applications without external biasing.
SMCJ17A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 54.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ17A-M3/9AT FAQ
1.How can I place an order for SMCJ17A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ17A-M3/9AT 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 SMCJ17A-M3/9AT reliable?
The price and inventory of SMCJ17A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ17A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ17A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ17A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ17A-M3/9AT?
SMCJ17A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ17A-M3/9AT 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 SMCJ17A-M3/9AT?
For technical support, including SMCJ17A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ17A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ17A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ17A-M3/9AT 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 SMCJ17A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ17A-M3/9AT?
All SMCJ17A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ17A-M3/9AT, 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 SMCJ17A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ17A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ17A-M3/9AT Tags
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