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Vishay General Semiconductor - Diodes Division SMCJ30A-M3/9AT
- Part No.:
- SMCJ30A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30A-M3/9AT.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,167
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Product details
Overview
SMCJ30A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 48.4 V maximum clamping voltage at 31.0 A peak pulse current, 30 V stand-off voltage, and 33.3–36.8 V breakdown range - deployed in automotive power line protection and industrial sensor interface circuits.
For engineers reviewing the SMCJ30A-M3/9AT datasheet, SMCJ30A-M3/9AT pinout, SMCJ30A-M3/9AT application, or SMCJ30A-M3/9AT equivalent, key selection criteria include unidirectional polarity, halogen-free RoHS-compliant construction (M3 suffix), 150 °C max junction temperature, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads per JEDEC standards.
Technical Context
This TVS diode operates as a clamping device in reverse-biased configuration, leveraging an avalanche breakdown mechanism to limit transient overvoltages before they reach downstream ICs or MOSFETs. Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
The SMCJ30A-M3/9AT exhibits a temperature coefficient of VBR at +0.099 %/°C and thermal resistance of 75 °C/W (junction-to-ambient) under standard mounting conditions. It meets MSL Level 1 per J-STD-020 and supports peak forward surge current of 200 A (8.3 ms half-sine) for unidirectional operation only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 30 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe operating margin below breakdown. |
| Breakdown Voltage (VBR) | 33.3–36.8 V at 1.0 mA test current - Confirmed avalanche initiation range; ensures reliable clamping onset above normal system voltage. |
| Clamping Voltage (VC) | 48.4 V at 31.0 A (10/1000 μs waveform) - Peak voltage seen by protected circuit during worst-case surge; critical for IC-level survivability. |
| Peak Pulse Power (PPPM) | 1500 W - Maximum transient energy absorption capability under standardized 10/1000 μs surge; determines robustness against IEC 61000-4-5 events. |
| Leakage Current (ID) | 1.0 μA max at VWM - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance nodes. |
| Junction Temperature Range | −55 °C to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with IPC-7351B land patterns. |
Pinout & Package
SMCJ30A-M3/9AT uses the SMC (DO-214AB) package: a two-terminal, surface-mount plastic case with cathode band marking. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient clamp output node | Connected to protected circuit's sensitive input or power rail; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane; completes clamping loop and establishes reference for VWM/VBR specification. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial OEMs without compromising surge performance. |
| Low incremental surge resistance | Enables tighter clamping voltage window (VC − VBR = 11.6–15.1 V), reducing stress on downstream MOSFET gate oxides and logic inputs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow without baking; simplifies manufacturing logistics for high-volume SMT lines. |
| AEC-Q101 qualification option | Available in HM3 variant (e.g., SMCJ30AHM3_X); enables direct use in automotive powertrain and body electronics without additional qualification. |
| Glass passivated chip junction | Improves long-term reliability under thermal cycling and humidity exposure versus epoxy-passivated alternatives. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp transients before reaching PMIC or MCU power pins. Use Value: Limits peak voltage to ≤48.4 V during 31 A surges, preventing latch-up or permanent damage to 5 V/3.3 V logic domains. |
Use Scenario: Analog sensor outputs (e.g., pressure, temperature) routed across noisy motor drive zones. IC Role / Device Role / Timing Role: Clamping diode on signal line to suppress coupled EFT bursts (IEC 61000-4-4) and ESD (IEC 61000-4-2). Use Value: Maintains signal fidelity with <1.0 μA leakage at 30 V, avoiding DC offset errors in precision 24-bit ADC front-ends. |
| Telecom DC Power Input Protection | Consumer Device USB Port Surge Suppression |
|
Use Scenario: 48 V PoE-powered network switches subjected to lightning-induced surges on Ethernet pairs. IC Role / Device Role / Timing Role: Primary TVS on DC input rail upstream of DC-DC converters to absorb bulk surge energy. Use Value: Handles 1500 W peak pulse without degradation, enabling compliance with Telcordia GR-1089-CORE Level 3 surge immunity. |
Use Scenario: USB 2.0 data lines in portable speakers or smart displays connected to wall adapters. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS on VBUS line to protect USB controller from adapter overvoltage faults. Use Value: Withstand 200 A 8.3 ms surge (IFSM), ensuring survival during AC/DC adapter short-circuit failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-M3 | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable for space-constrained consumer PCBs where surge energy is limited to IEC 61000-4-2 Level 4 only. | Select when board area is critical and peak surge energy does not exceed 400 W; verify thermal derating at 75 °C ambient. |
| SMCJ30CA-M3 | Bidirectional version; identical VWM, VBR, VC, and PPPM but symmetrical clamping in both polarities. | Required for AC-coupled signal lines (e.g., RS-485, CAN FD) or dual-rail systems where reverse polarity transients occur. | Choose only if bidirectional protection is mandated; unidirectional SMCJ30A-M3 offers lower cost and simpler layout for DC rails. |
Compared with SMAJ30A-M3, the SMCJ30A-M3/9AT delivers 275 % higher surge power handling and superior thermal dissipation; versus SMCJ30CA-M3, it provides optimized cost and layout efficiency for single-polarity DC protection without sacrificing clamping performance.
Availability
SMCJ30A-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution modules, industrial PLC I/O cards, telecom DC power supplies, and consumer USB-C power delivery systems requiring stable component supply and halogen-free compliance.
Supply support for SMCJ30A-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, TVS devices, and optoelectronics 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 failure modes must be mitigated without adding complexity or cost.
FAQ
What is the maximum clamping voltage of the SMCJ30A-M3/9AT under a 10/1000 µs surge?
The SMCJ30A-M3/9AT has a maximum clamping voltage (VC) of 48.4 V when subjected to a 31.0 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The SMCJ30A-M3/9AT maintains this clamping performance across its specified operating temperature range and is validated using standard JEDEC mounting conditions (8.0 mm × 8.0 mm copper pads).
Does the SMCJ30A-M3/9AT meet automotive qualification standards?
The base SMCJ30A-M3/9AT is halogen-free and RoHS-compliant but not AEC-Q101 qualified. However, Vishay offers the automotive-grade variant SMCJ30AHM3_X (where "_X" denotes revision code), which carries full AEC-Q101 qualification. The SMCJ30A-M3/9AT itself is widely used in non-safety-critical automotive subsystems such as infotainment and body control modules where customer internal validation suffices.
What is the meaning of the "M3" suffix in SMCJ30A-M3/9AT?
The "M3" suffix in SMCJ30A-M3/9AT indicates halogen-free, RoHS-compliant construction per Vishay's material categorization standard (document 99912). It specifies matte tin-plated leads, JESD 201 Class 2 whisker resistance, and compliance with UL 94 V-0 flammability rating. This distinguishes it from the "E3" (RoHS-compliant, non-halogen-free) and "HM3" (AEC-Q101 qualified + halogen-free) variants.
Can the SMCJ30A-M3/9AT be used in bidirectional signal protection?
No - the SMCJ30A-M3/9AT is strictly unidirectional, with polarity marked by a cathode band. For bidirectional protection, Vishay specifies the SMCJ30CA-M3 variant, which features symmetrical breakdown and clamping in both directions. Using the SMCJ30A-M3/9AT on AC or reversible signal paths risks failure during negative transients due to lack of reverse conduction capability.
What is the thermal resistance of the SMCJ30A-M3/9AT, and how does it affect layout?
The SMCJ30A-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 TJ ≤ 150 °C under continuous 6.5 W dissipation, PCB layout must provide adequate copper area and avoid thermal bottlenecks. The SMCJ30A-M3/9AT benefits from thermal vias under pads and connection to internal ground planes for enhanced heat spreading.
SMCJ30A-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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMCJ30A-M3/9AT FAQ
1.How can I place an order for SMCJ30A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30A-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 SMCJ30A-M3/9AT reliable?
The price and inventory of SMCJ30A-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 SMCJ30A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ30A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30A-M3/9AT?
SMCJ30A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30A-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 SMCJ30A-M3/9AT?
For technical support, including SMCJ30A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ30A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ30A-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 SMCJ30A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ30A-M3/9AT?
All SMCJ30A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30A-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 SMCJ30A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ30A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30A-M3/9AT Tags
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