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Vishay General Semiconductor - Diodes Division SMC3K48CAHM3/9A
- Part No.:
- SMC3K48CAHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K48CAHM3/9A.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,088
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Product details
Overview
SMC3K48CAHM3/9A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, with 48 V stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR), 3000 W peak pulse power (10/1000 μs), and 38.8 A peak pulse current (IPPM), designed to protect automotive-grade sensor signal lines and MOSFET gates against inductive switching transients.
For engineers reviewing the SMC3K48CAHM3/9A datasheet, SMC3K48CAHM3/9A pinout, SMC3K48CAHM3/9A application, or SMC3K48CAHM3/9A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, MSL level 1 moisture sensitivity, and compatibility with wave-soldering process constraints for high-reliability automotive PCBs.
Technical Context
The SMC3K48CAHM3/9A operates as a voltage-clamping device that activates when reverse transient voltage exceeds its breakdown threshold (53.3–58.9 V at 1 mA), limiting downstream voltage to ≤77.4 V at 38.8 A surge current. Its low incremental surge resistance ensures stable clamping under fast-rising transients.
It is rated for junction temperatures from –55 °C to +150 °C, meets UL 497B safety recognition (E136766), and is qualified per AEC-Q101 for automotive use-confirming robustness against thermal cycling, humidity, and mechanical stress in engine control and ADAS subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin. |
| VBR min/max | 53.3 V / 58.9 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on across production lot. |
| VC @ IPPM | 77.4 V - Clamped voltage at 38.8 A peak pulse; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 3000 W - Peak pulse power handling with 10/1000 μs waveform; supports high-energy ESD and load-dump suppression. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments without derating. |
| Polarity | Bidirectional - Symmetric clamping for AC-coupled or floating signal lines; no polarity marking required. |
| Package | SMC (DO-214AB) - Standardized 8.0 mm × 8.0 mm copper pad footprint; compatible with automated SMT placement and reflow. |
Pinout & Package
SMC3K48CAHM3/9A uses the standard SMC (DO-214AB) surface-mount package: two-terminal, unmarked bidirectional device with cathode band omitted. Leads 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 |
|---|---|---|
| Anode | Transient current sink during positive half-cycle | Connects to protected line; conducts surge current toward ground or rail when voltage exceeds VBR in either polarity. |
| Cathode | Transient current sink during negative half-cycle | Functionally identical to anode in bidirectional configuration; no polarity distinction in layout or routing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and ADAS sensors; guarantees reliability over temperature and lifetime cycles. |
| 3000 W peak pulse power | Withstands high-energy transients from inductive load switching (e.g., fuel injectors, solenoids) without degradation. |
| MSL Level 1 rating | Zero floor life limitation; can be stored indefinitely before reflow without baking or dry-pack requirements. |
| UL 497B recognition | E136766 file number confirms compliance with transient protection safety standards for telecom and industrial equipment. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes AEC-Q101 grade with halogen-free molding compound and lead-free terminations for eco-conscious manufacturing. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed directly at connector or IC input pins to shunt transients before they reach sensitive circuitry. Use Value: Limits voltage to ≤77.4 V during 38.8 A surges, preserving signal integrity and preventing latch-up or gate oxide damage in automotive-grade ICs. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and motor drive noise in factory automation. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor mounted across input terminals to clamp induced spikes before optocoupler or microcontroller inputs. Use Value: Maintains 48 V system compatibility while suppressing >1 kV transients with sub-nanosecond response, reducing false triggering and field failures. |
| Power Supply Rail Protection | MOSFET Gate Protection |
|
Use Scenario: Secondary-side transient suppression on 48 V DC-DC converter outputs feeding infotainment or ADAS domain controllers. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing energy from coupled transients on regulated rails, complementing upstream filtering. Use Value: Delivers 3000 W pulse handling without derating at +125 °C ambient, ensuring sustained protection during thermal stress events. |
Use Scenario: Gate-source protection of high-side N-channel MOSFETs used in automotive lighting drivers and battery disconnect switches. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) bidirectional clamp placed between gate and source to prevent overvoltage during Miller-induced ringing. Use Value: Prevents gate oxide breakdown by clamping spikes to ≤77.4 V while adding negligible capacitive loading to fast-switching gate drive paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K48CAHM3_A/9A | Same electrical specs and AEC-Q101 qualification; updated suffix indicates revised internal revision control and traceability. | No functional difference; intended as direct replacement for legacy SMC3K48CAHM3/9A in new designs. | Select when sourcing newly released production lots with enhanced lot-level documentation and extended lifecycle support. |
| SMAJ48AHE3/57 | Lower peak pulse power (400 W), smaller SMA package (DO-214AC), same 48 V VWM but higher VC (77.4 V → 79.4 V). | Suitable for space-constrained consumer or industrial boards where 3000 W rating is not required. | Choose only if board area is critical and surge energy remains below 400 W; not recommended for automotive under-hood use. |
Compared with SMC3K48CAHM3/9A, the SMC3K48CAHM3_A/9A offers identical protection performance with improved manufacturing traceability, while SMAJ48AHE3/57 trades pulse power and ruggedness for compactness-making it unsuitable for high-energy automotive transients despite matching VWM.
Availability
SMC3K48CAHM3/9A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and 48 V power supply rail protection requiring stable component supply across multi-year production programs.
Supply support for SMC3K48CAHM3/9A 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, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMC3K48CAHM3/9A belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What does the "HM3" suffix indicate in SMC3K48CAHM3/9A?
The HM3 suffix in SMC3K48CAHM3/9A denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. It distinguishes this automotive-grade variant from commercial M3 versions and confirms compliance with stringent automotive reliability and environmental standards. The SMC3K48CAHM3/9A is fully specified for under-hood deployment.
Is SMC3K48CAHM3/9A suitable for bottom-side wave soldering?
No, SMC3K48CAHM3/9A is explicitly not recommended for PCB bottom-side wave mounting per Vishay's datasheet. Its SMC (DO-214AB) package and thermal mass require top-side reflow or selective soldering to avoid delamination or solder joint voiding. For wave-soldered assemblies, consider alternative footprints or protective masking strategies. Always verify thermal profiles using the SMC3K48CAHM3/9A's published MSL Level 1 and 260 °C peak temperature limits.
How does the clamping voltage VC of SMC3K48CAHM3/9A compare to its VWM and VBR?
The SMC3K48CAHM3/9A has a VWM of 48 V, VBR range of 53.3–58.9 V, and VC of 77.4 V at 38.8 A. This means it remains non-conductive up to 48 V, begins clamping near 55 V, and limits surge voltage to ≤77.4 V-providing ~29 V overhead for protected ICs. This margin ensures compatibility with 75 V-rated automotive components while maintaining fast response and low leakage (<2 μA at VWM).
Can SMC3K48CAHM3/9A replace older SMC3K48CA-M3/9A parts in existing designs?
Yes, SMC3K48CAHM3/9A is a drop-in replacement for SMC3K48CA-M3/9A in terms of footprint, electrical specs, and thermal performance-but adds AEC-Q101 qualification and halogen-free materials. No PCB changes are required. However, due to its automotive-grade construction, SMC3K48CAHM3/9A may exhibit tighter parameter distributions and longer lifecycle support than the commercial M3 version.
What is the maximum operating temperature for SMC3K48CAHM3/9A in continuous service?
The SMC3K48CAHM3/9A has a maximum junction temperature (TJ max) of +150 °C and is rated for continuous operation from –55 °C to +150 °C. Derating begins above TA = 25 °C per the datasheet's thermal curves; at +105 °C ambient, its peak pulse power drops to ~1800 W. For sustained 48 V rail protection in engine control units, ensure adequate copper pour and thermal relief per Vishay's SMC layout guidelines.
SMC3K48CAHM3/9A 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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 38.8A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMC3K48CAHM3/9A FAQ
1.How can I place an order for SMC3K48CAHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K48CAHM3/9A 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 SMC3K48CAHM3/9A reliable?
The price and inventory of SMC3K48CAHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K48CAHM3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K48CAHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K48CAHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K48CAHM3/9A?
SMC3K48CAHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K48CAHM3/9A 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 SMC3K48CAHM3/9A?
For technical support, including SMC3K48CAHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K48CAHM3/9A requirements.
6.How does Aetrix verify that SMC3K48CAHM3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K48CAHM3/9A 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 SMC3K48CAHM3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K48CAHM3/9A?
All SMC3K48CAHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K48CAHM3/9A, 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 SMC3K48CAHM3/9A part is unused and in its original packaging.
Return procedure for SMC3K48CAHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K48CAHM3/9A Tags
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