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Vishay General Semiconductor - Diodes Division SMCJ30CAHM3_A/H
- Part No.:
- SMCJ30CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30CAHM3_A/H.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,360
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Product details
Overview
SMCJ30CAHM3_A/H from Vishay General Semiconductor is a bidirectional 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 30 V standoff voltage (VWM), 48.4 V clamping voltage at 31.0 A peak pulse current (10/1000 µs), and 1500 W peak pulse power dissipation, with AEC-Q101 qualification for automotive electronics.
For engineers reviewing the SMCJ30CAHM3_A/H datasheet, SMCJ30CAHM3_A/H pinout, SMCJ30CAHM3_A/H application, or SMCJ30CAHM3_A/H equivalent, key selection criteria include bidirectional clamping performance, 1500 W surge capability, AEC-Q101 qualification status, halogen-free RoHS compliance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, responding within picoseconds to transients induced by inductive switching or ESD events. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths.
The SMCJ30CAHM3_A/H delivers stable performance across -55 °C to +150 °C junction temperature, with low incremental surge resistance and thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation under repeated surge stress without derating in standard PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 33.3 V / 36.8 V - breakdown voltage range at 1.0 mA test current, defining turn-on threshold |
| VC @ IPPM | 48.4 V - clamped voltage at 31.0 A peak pulse current, limiting downstream voltage stress |
| PPPM | 1500 W - peak pulse power handling per 10/1000 µs waveform, critical for lightning/surge immunity |
| TJ max | +150 °C - maximum junction temperature, supporting under-hood automotive deployment |
| Package | SMC (DO-214AB) - surface-mount package with 8.0 mm × 8.0 mm thermal pad footprint |
| Qualification | AEC-Q101 qualified - validated for automotive-grade reliability and lifetime stress testing |
| Compliance | Halogen-free, RoHS-compliant - meets environmental requirements for modern electronics manufacturing |
Pinout & Package
SMCJ30CAHM3_A/H uses the SMC (DO-214AB) package: a 2-terminal surface-mount case with matte tin-plated leads, no polarity marking (bidirectional), and MSL Level 1 rating (peak reflow 260 °C). Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to protected line; conducts during positive or negative overvoltage events |
| Cathode | Transient return path (bidirectional) | Connects to protected line; symmetrically conducts with Anode-no functional distinction in CA devices |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions eliminates need for polarity-aware layout |
| 1500 W surge rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V systems without failure |
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes voltage overshoot during transients, protecting 3.3 V/5 V logic and MOSFET gate drivers |
| MSL Level 1 | Enables standard reflow soldering without moisture sensitivity concerns or baking requirements |
| Halogen-free construction | Meets automotive OEM material declarations (e.g., GMW3172, Ford WSS-M99P9999-A1) |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-supplied ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Primary clamping device placed at power entry point before DC/DC converters and microcontrollers. Use Value: Limits voltage to ≤48.4 V during 31 A surges, preventing latch-up or permanent damage to downstream 5 V/3.3 V ICs. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance shunt protector on differential or single-ended signal lines. Use Value: Clamps transients faster than op-amp input stages respond, preserving signal integrity and ADC accuracy. |
| Telecom Line Surge Suppression | Consumer Power Adapter Input Protection |
Use Scenario: Safeguarding PoE-powered equipment inputs against lightning-induced surges on Ethernet cables. IC Role / Device Role / Timing Role: First-stage protector on 48 V DC input rail prior to isolation and regulation circuitry. Use Value: Absorbs up to 1500 W of surge energy without degradation, maintaining system uptime in outdoor deployments. | Use Scenario: Securing AC/DC adapter primary-side rectifier outputs against mains-borne transients. IC Role / Device Role / Timing Role: Secondary-side TVS on DC output to protect connected devices from adapter fault conditions. Use Value: Provides fail-safe clamping at 48.4 V, ensuring USB-C PD or 20 V laptop inputs remain within safe operating limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CAHE3_A/H | Lower PPPM (400 W), smaller SMA package, same VWM/VC specs | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is Class B or lower |
| SMCJ30AHE3_A/H | Unidirectional version; cathode band marking; identical VWM/VC/PPPM | Requires polarity-aware layout; not suitable for AC or floating signals | Choose only for DC rails where reverse conduction must be blocked |
Compared with SMAJ30CAHE3_A/H and SMCJ30AHE3_A/H, the SMCJ30CAHM3_A/H uniquely combines 1500 W surge capacity, bidirectional symmetry, and halogen-free AEC-Q101 qualification-making it the preferred choice for high-reliability automotive and industrial power rail protection where layout flexibility and regulatory compliance are mandatory.
Availability
SMCJ30CAHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and consumer power adapters requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ30CAHM3_A/H 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 and application-specific performance.
The SMCJ series was developed specifically for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom applications demanding AEC-Q101 qualification and 1500 W surge immunity.
FAQ
What is the clamping voltage of SMCJ30CAHM3_A/H at its rated peak pulse current?
The SMCJ30CAHM3_A/H has a maximum clamping voltage (VC) of 48.4 V at 31.0 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per terminal and defines the upper voltage limit imposed on protected circuits during surge events. The SMCJ30CAHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMCJ30CAHM3_A/H suitable for automotive applications?
Yes, SMCJ30CAHM3_A/H is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes halogen-free, RoHS-compliant materials, MSL Level 1 reflow compatibility, and guaranteed operation from -55 °C to +150 °C. The SMCJ30CAHM3_A/H is commonly deployed in engine control modules, body control units, and ADAS camera power inputs where sustained reliability under thermal and electrical stress is required.
How does the bidirectional design of SMCJ30CAHM3_A/H affect circuit layout?
The bidirectional design of SMCJ30CAHM3_A/H eliminates polarity marking and allows placement without regard to signal direction or DC bias polarity. Unlike unidirectional TVS diodes, the SMCJ30CAHM3_A/H has no cathode band and functions identically in either orientation-simplifying layout, reducing BOM variants, and enabling use on AC-coupled lines, differential buses, or floating grounds where voltage reversals occur.
What is the thermal resistance of SMCJ30CAHM3_A/H, and how does it impact PCB design?
The SMCJ30CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. To achieve rated 1500 W pulse power, the PCB must provide 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Reducing pad size or adding thermal vias alters RθJA and requires derating per Figure 2 in the Vishay datasheet 88394. The SMCJ30CAHM3_A/H does not require heatsinks for single-pulse operation.
Does SMCJ30CAHM3_A/H meet industry surge immunity standards such as IEC 61000-4-5?
Yes, the 1500 W peak pulse power rating of SMCJ30CAHM3_A/H corresponds to IEC 61000-4-5 Level 4 (4 kV line-to-earth, 2 Ω source impedance) on 12 V systems. When used with appropriate series impedance (e.g., 10 Ω inline resistor), the SMCJ30CAHM3_A/H clamps the voltage seen by downstream components to ≤48.4 V during the surge event. System-level compliance requires validation with the full circuit, but the SMCJ30CAHM3_A/H is a proven front-end protector in certified automotive and industrial designs.
SMCJ30CAHM3_A/H 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:
- -
- Bidirectional Channels:
- 1
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ30CAHM3_A/H FAQ
1.How can I place an order for SMCJ30CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30CAHM3_A/H 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 SMCJ30CAHM3_A/H reliable?
The price and inventory of SMCJ30CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ30CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30CAHM3_A/H?
SMCJ30CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30CAHM3_A/H 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 SMCJ30CAHM3_A/H?
For technical support, including SMCJ30CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30CAHM3_A/H requirements.
6.How does Aetrix verify that SMCJ30CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ30CAHM3_A/H 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 SMCJ30CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ30CAHM3_A/H?
All SMCJ30CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30CAHM3_A/H, 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 SMCJ30CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ30CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30CAHM3_A/H Tags
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