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Vishay General Semiconductor - Diodes Division SMCJ45A-M3/9AT
- Part No.:
- SMCJ45A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45A-M3/9AT.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,394
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Product details
Overview
SMCJ45A-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 45 V standoff voltage (VWM), 50.0–55.3 V breakdown range (VBR at 1 mA), 72.7 V maximum clamping voltage (VC) at 20.6 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ45A-M3/9AT datasheet, SMCJ45A-M3/9AT pinout, SMCJ45A-M3/9AT application, or SMCJ45A-M3/9AT equivalent, this page delivers verified electrical parameters, thermal derating behavior, polarity marking convention, halogen-free RoHS-compliant construction, and AEC-Q101 qualification path - all critical for surge immunity validation in 12 V/24 V systems.
Technical Context
The SMCJ45A-M3/9AT operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%), low incremental surge resistance (Rdyn ≈ 1.8 Ω derived from ΔVC/ΔIPPM), and fast response time (<1 ps), enabling effective suppression of ESD, lightning-induced transients, and inductive switching spikes.
Thermally, it exhibits RθJA = 75 °C/W (on recommended 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, supporting reliable operation up to TJ = +150 °C. The cathode band marking aligns with industry-standard polarity identification for automated placement and post-solder inspection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC rail margin for 48 V nominal systems. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on under surge conditions without premature conduction. |
| VC @ IPPM | 72.7 V at 20.6 A - Clamped voltage during 1500 W transient; determines protected circuit's maximum stress level. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 µs waveform; validates compliance with IEC 61000-4-5 Level 4 (4 kV) |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with J-STD-020 MSL Level 1 reflow. |
| Construction | Halogen-free, RoHS-compliant (M3 suffix); matte tin-plated leads meeting JESD 22-B102 solderability and JESD 201 Class 2 whisker resistance. |
Pinout & Package
SMCJ45A-M3/9AT uses the standard SMC (DO-214AB) package: a 2-terminal surface-mount device with cathode identified by a visible band on the body. Terminals are matte tin-plated for compatibility with lead-free reflow processes and high-reliability solder joints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to lower-potential side of protected line (e.g., ground or return path); defines conduction direction in unidirectional mode. |
| Cathode | Avalanche conduction terminal / Surge current sink | Marked with band; connected to higher-potential side (e.g., VIN, signal line); carries full transient current to ground during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables single-device protection against severe transients per IEC 61000-4-5 Ed. 3, including 4 kV line-to-line surges in 24 V industrial systems. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage in MOSFET drivers and microcontrollers. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile usage without baking, simplifying SMT production for high-volume automotive Tier 1 suppliers. |
| AEC-Q101 qualification path | Base P/NHM3_X variants support automotive-grade reliability testing (HTOL, TC, UHAST); SMCJ45A-M3/9AT shares identical die and construction. |
| Glass passivated junction | Ensures long-term parameter stability and low leakage drift over 10+ years in harsh thermal cycling environments (−55 °C to +150 °C). |
Applications
| Automotive Body Control Module (BCM) | Industrial 24 V DC Power Input Stage |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and relay driver outputs from load dump and jump-start transients in vehicle door modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground, clamping spikes above 45 V while maintaining <1 µA leakage at nominal 12 V/24 V. Use Value: Prevents permanent damage to 3.3 V/5 V logic interfaces during ISO 7637-2 Pulse 5a (35 V/100 ms) events without requiring active crowbar circuits. |
Use Scenario: Safeguarding programmable logic controller (PLC) digital input cards against field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V supply rail upstream of DC/DC converter, absorbing repetitive 1 kV/500 A transients from solenoid coil switching. Use Value: Eliminates need for external series impedance or RC snubbers, reducing BOM count while sustaining >100,000 surge cycles per IEC 61000-4-5. |
| Telecom Remote Radio Unit (RRU) Power Interface | Consumer Smart Home Gateway DC Jack |
|
Use Scenario: Shielding PoE-powered remote radio units from lightning-induced common-mode surges entering via outdoor power cables. IC Role / Device Role / Timing Role: Primary unidirectional clamp on 48 V DC input, coordinated with common-mode chokes and secondary TVS arrays for differential-mode suppression. Use Value: Limits clamped voltage to ≤73 V, preserving integrity of 50 V-rated DC/DC controllers and preventing thermal runaway in GaN FETs. |
Use Scenario: Providing basic surge immunity at the barrel jack input of Wi-Fi 6 gateways powered by external 12 V adapters. IC Role / Device Role / Timing Role: First-line TVS on adapter input rail, sized to handle 1.5 kV contact ESD (IEC 61000-4-2) and 0.5 kV AC line surges per UL 62368-1 Annex G. Use Value: Achieves Class B EMC compliance without additional filtering components, lowering system cost and PCB area versus multi-stage protection schemes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/61T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VBR specs | Limited to low-energy transients (e.g., ESD-only); unsuitable for IEC 61000-4-5 Level 3+ or load dump | Select when board space is constrained and surge energy is ≤400 W; verify thermal margin at 100 kHz switching frequencies. |
| SMCJ45CA-M3/9AT | Bidirectional variant; symmetric VBR (50.0–55.3 V) in both polarities; identical PPPM, VC, and package | Required for AC-coupled signal lines or floating buses where polarity reversal occurs (e.g., RS-485, CAN FD) | Choose for bidirectional protection needs; note that unidirectional SMCJ45A-M3/9AT cannot replace it in AC applications. |
Compared with SMAJ45A-E3/61T, SMCJ45A-M3/9AT delivers 275 % higher surge power handling and superior thermal dissipation, making it suitable for demanding automotive and industrial environments; versus SMCJ45CA-M3/9AT, it offers lower cost and reduced capacitance but lacks reverse-polarity protection capability.
Availability
SMCJ45A-M3/9AT is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power inputs, and telecom remote radio unit protection requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.
Supply support for SMCJ45A-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series was engineered for high-energy transient suppression in automotive, industrial, and telecom infrastructure, targeting robustness against load dump, ESD, and lightning surges in compact SMC packages.
FAQ
What is the maximum clamping voltage of the SMCJ45A-M3/9AT under a 10/1000 µs surge?
The SMCJ45A-M3/9AT has a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current of 20.6 A using the standardized 10/1000 µs waveform. This value is measured at TA = 25 °C on recommended copper pad layout and defines the upper voltage limit imposed on protected circuitry during transient events. The SMCJ45A-M3/9AT maintains this clamping performance across its full operating temperature range.
Is the SMCJ45A-M3/9AT suitable for automotive applications?
Yes - the SMCJ45A-M3/9AT shares identical die, packaging, and test methodology with AEC-Q101 qualified variants (e.g., SMCJ45A-HM3_X). While the M3/9AT suffix itself denotes halogen-free RoHS compliance rather than certified qualification, its construction meets all baseline requirements for automotive use, including MSL Level 1, JESD 201 Class 2 whisker resistance, and −55 °C to +150 °C operating range. For formal qualification, specify HM3_X suffix parts.
How does the SMCJ45A-M3/9AT differ from the bidirectional SMCJ45CA-M3/9AT?
The SMCJ45A-M3/9AT is unidirectional, with polarity marked by a cathode band and conduction only in reverse bias; the SMCJ45CA-M3/9AT is bidirectional, offering symmetrical clamping in both directions with no polarity marking. Both share identical VWM (45 V), VBR, VC, and PPPM (1500 W), but the SMCJ45A-M3/9AT exhibits lower junction capacitance and is preferred for DC rail protection, whereas SMCJ45CA-M3/9AT is required for AC or floating signal lines like CAN or RS-485.
What is the thermal resistance of the SMCJ45A-M3/9AT, and how does it affect layout?
The SMCJ45A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal, and RθJL = 15 °C/W to the lead. To maintain TJ ≤ 150 °C under worst-case 1500 W pulses, PCB layout must provide adequate copper area and minimize trace inductance. Reducing pad size increases RθJA, risking thermal runaway during repeated surges - always follow Vishay's recommended land pattern for SMCJ45A-M3/9AT.
Does the SMCJ45A-M3/9AT meet any safety or flammability standards?
Yes - the SMCJ45A-M3/9AT's molding compound complies with UL 94 V-0 flammability rating, and the device carries Underwriters Laboratories recognition (QVGQ2) under UL 497B for protector classification, with file number E136766. These certifications validate its suitability for use in end equipment requiring fire-resistant components and recognized surge protection, including industrial control panels and telecom infrastructure hardware containing the SMCJ45A-M3/9AT.
SMCJ45A-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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- 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)
SMCJ45A-M3/9AT FAQ
1.How can I place an order for SMCJ45A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45A-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 SMCJ45A-M3/9AT reliable?
The price and inventory of SMCJ45A-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 SMCJ45A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ45A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45A-M3/9AT?
SMCJ45A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45A-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 SMCJ45A-M3/9AT?
For technical support, including SMCJ45A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ45A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ45A-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 SMCJ45A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ45A-M3/9AT?
All SMCJ45A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45A-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 SMCJ45A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ45A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45A-M3/9AT Tags
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