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Vishay General Semiconductor - Diodes Division SMCJ30CAHM3_A/I
- Part No.:
- SMCJ30CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30CAHM3_A/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,504
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Product details
Overview
SMCJ30CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 30 V standoff voltage (VWM), 48.4 V clamping voltage (VC) at 31.0 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive and industrial systems against inductive switching transients and lightning-induced surges.
For engineers reviewing the SMCJ30CAHM3_A/I datasheet, SMCJ30CAHM3_A/I pinout, SMCJ30CAHM3_A/I application, or SMCJ30CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, 1500 W surge rating, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, responding within picoseconds to transient overvoltages. Its bidirectional symmetry ensures identical electrical characteristics in both polarities, eliminating polarity concerns in AC-coupled or differential signal paths.
Designed for surface-mount implementation on 8.0 mm × 8.0 mm copper pads per terminal, it delivers stable clamping performance up to 150 °C junction temperature while maintaining low incremental surge resistance and meeting MSL Level 1 reflow requirements (260 °C peak).
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 across device at 31.0 A peak pulse current (10/1000 μs waveform) |
| PPPM | 1500 W - Peak pulse power handling capacity under standardized surge conditions |
| ID @ VWM | 1.0 μA - Reverse leakage current at rated standoff voltage, ensuring minimal standby power loss |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
Pinout & Package
SMCJ30CAHM3_A/I uses the SMC (DO-214AB) package: a two-terminal, non-polarized surface-mount case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional construction means no cathode/anode marking; terminals are functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as input/output for transient energy shunting; no polarity dependency |
| Terminal 2 | Anode/Cathode (bidirectional) | Paired terminal completing low-impedance surge path to ground or rail-to-rail clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern electronics manufacturing and end-of-life disposal |
| Low incremental surge resistance | Enables tighter clamping voltage control during high-current transients, reducing stress on downstream components |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, simplifying SMT production flow |
| Glass passivated junction | Provides stable electrical characteristics and long-term reliability under thermal and humidity stress |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting LIN bus nodes and body control module inputs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across power rail and ground to limit transient excursions to safe levels. Use Value: Maintains system uptime by preventing latch-up or destruction of 3.3 V/5 V microcontrollers during ISO 7637-2 Pulse 5a events. | Use Scenario: Safeguarding analog outputs of pressure and temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance shunt protector on differential or single-ended sensor output traces. Use Value: Preserves signal integrity with <1.0 μA leakage at 30 V, avoiding DC offset errors in precision measurement circuits. |
| Telecom Line Interface Protection | Consumer Appliance Motor Drive Circuits |
Use Scenario: Shielding Ethernet PHY interfaces and PoE injectors from ESD and induced surges on twisted-pair cables. IC Role / Device Role / Timing Role: Primary-level TVS placed at connector entry point before common-mode chokes and data line receivers. Use Value: Absorbs 1500 W surges without degradation, meeting IEC 61000-4-5 Level 4 immunity requirements. | Use Scenario: Suppressing back-EMF spikes generated by brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Across-motor terminals to clamp inductive kickback during PWM switching transitions. Use Value: Enables use of lower-voltage-rated MOSFETs by limiting flyback voltage to ≤48.4 V, reducing BOM cost and layout area. |
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/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC specs | Suitable only for lower-energy transients; not recommended for ISO 7637-2 or IEC 61000-4-5 Level 4 | Select when board space is constrained and surge threat level is limited to ESD or low-energy switching noise |
| SMCJ33CAHM3_A/I | Higher VWM (33 V), higher VBR (36.7–40.6 V), same package and PPPM | Better suited for 3.3 V rail protection where higher standoff avoids false triggering | Choose when protecting 3.3 V logic interfaces requiring tighter margin between operating voltage and clamping threshold |
Compared with SMCJ30CAHM3_A/I, SMAJ30CAHE3_A/I offers reduced surge capacity in a smaller footprint, while SMCJ33CAHM3_A/I provides higher standoff for improved noise immunity-both require evaluation of system-level threat profile and layout constraints before substitution.
Availability
SMCJ30CAHM3_A/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom line conditioning, and consumer appliance motor drive circuits requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ30CAHM3_A/I 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 targets high-energy transient suppression in harsh environments; its design prioritizes automotive-grade robustness, consistent clamping performance, and compatibility with automated manufacturing processes.
FAQ
What is the clamping voltage of SMCJ30CAHM3_A/I at its rated peak pulse current?
The SMCJ30CAHM3_A/I has a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current (IPPM) of 31.0 A under the standard 10/1000 μs waveform. This value is measured across the device terminals during surge conduction and defines the upper voltage limit imposed on protected circuitry during transient events. The SMCJ30CAHM3_A/I maintains this clamping performance across its full operating temperature range.
Is SMCJ30CAHM3_A/I suitable for automotive applications?
Yes, SMCJ30CAHM3_A/I is AEC-Q101 qualified and explicitly designated for automotive use via its HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It meets stringent reliability requirements for under-hood and chassis-mounted electronics, including thermal cycling, humidity bias, and mechanical shock testing. The SMCJ30CAHM3_A/I is commonly deployed in body control modules, infotainment power supplies, and sensor interface protection in vehicles.
How does the bidirectional configuration of SMCJ30CAHM3_A/I affect its usage in circuit design?
The bidirectional configuration of SMCJ30CAHM3_A/I eliminates polarity sensitivity, allowing placement across AC-coupled signals, differential pairs, or ungrounded rails without orientation concerns. Unlike unidirectional TVS diodes, the SMCJ30CAHM3_A/I provides symmetrical clamping in both directions, making it ideal for protecting communication lines such as CAN, LIN, or RS-485 where voltage reversals occur. No cathode marking is present on the SMCJ30CAHM3_A/I package.
What is the thermal resistance of SMCJ30CAHM3_A/I from junction to ambient?
The typical thermal resistance from junction to ambient (RθJA) for SMCJ30CAHM3_A/I is 75 °C/W when mounted on the minimum recommended pad layout (0.31" × 0.31" copper pads per terminal). This value assumes natural convection cooling and directly impacts steady-state power dissipation capability. For reliable long-term operation, the SMCJ30CAHM3_A/I must be thermally managed to maintain junction temperature below +150 °C under combined DC leakage and surge duty cycles.
Does SMCJ30CAHM3_A/I require special PCB layout considerations?
Yes, SMCJ30CAHM3_A/I requires adherence to Vishay's recommended mounting pad layout: 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to ensure specified thermal and surge performance. Short, wide traces to ground or return paths minimize inductance and preserve clamping effectiveness. The SMCJ30CAHM3_A/I should be placed as close as possible to the protected interface, with no vias or narrow traces between the device and the protected node.
SMCJ30CAHM3_A/I 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/I FAQ
1.How can I place an order for SMCJ30CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30CAHM3_A/I 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/I reliable?
The price and inventory of SMCJ30CAHM3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMCJ30CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30CAHM3_A/I?
SMCJ30CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30CAHM3_A/I 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/I?
For technical support, including SMCJ30CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ30CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ30CAHM3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SMCJ30CAHM3_A/I?
All SMCJ30CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30CAHM3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SMCJ30CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30CAHM3_A/I Tags
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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