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Vishay General Semiconductor - Diodes Division SMC3K48CAHM3_A/H
- Part No.:
- SMC3K48CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K48CAHM3_A/H.pdf
- Description:
- 3KW, 48V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:1,670
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Product details
Overview
SMC3K48CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, designed for automotive and industrial electronics protection. It features a 48 V stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR), 77.4 V clamping voltage at 38.8 A (10/1000 μs), 3000 W peak pulse power, and AEC-Q101 qualification - deployed to safeguard MOSFETs and sensor signal lines against ISO 7637-2 and ISO 16750-2 transients.
For engineers reviewing the SMC3K48CAHM3_A datasheet, SMC3K48CAHM3_A pinout, SMC3K48CAHM3_A application, or SMC3K48CAHM3_A equivalent, key selection criteria include clamping performance under 10/1000 μs and 8/20 μs waveforms, bidirectional surge handling up to 3000 W, AEC-Q101 compliance for automotive use, thermal resistance (RthJA = 90 °C/W), and compatibility with 12 V battery system load-dump and pulse-b immunity requirements.
Technical Context
This TVS diode operates as a voltage-clamping protector in parallel with sensitive circuit nodes, responding within picoseconds to transient overvoltages. Its bidirectional architecture enables symmetric suppression of both positive and negative polarity surges without polarity marking on the SMC package.
It meets ISO 7637-2 Pulse 1, 2a, 3a, 3b and ISO 16750-2 Pulse b specifications, delivering 30 kV ESD immunity per IEC 61000-4-2 (HBM contact/air mode), and sustains junction temperatures up to +175 °C with MSL Level 1 moisture sensitivity rating and 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - maximum continuous reverse operating voltage before clamping initiates; defines safe DC bias margin for 12 V/24 V automotive systems. |
| VBR (min/max) | 53.3 V / 58.9 V - breakdown voltage range at 1 mA test current; ensures reliable turn-on above normal operating voltage but below IC damage thresholds. |
| VC @ IPPM (10/1000 μs) | 77.4 V at 38.8 A - clamping voltage during standardized surge; limits downstream voltage stress to <78 V during 3 kW transients. |
| PPPM | 3000 W - peak pulse power rating for 10/1000 μs waveform; supports robust protection against inductive switching and load dump events. |
| TJ max. | +175 °C - maximum junction temperature; enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| RthJA | 90 °C/W - thermal resistance junction-to-ambient on FR4 PCB; informs heatsinking requirements for sustained surge duty cycles. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress; required for ECUs and ADAS modules. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002/JESD 22-B102, MSL Level 1, 260 °C reflow peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Reference terminal for bidirectional conduction | No functional polarity marking on bidirectional types; terminals are symmetrical - either lead serves as anode/cathode depending on transient polarity. |
| Anode (unmarked end) | Reference terminal for bidirectional conduction | Identical electrical behavior to cathode; device conducts equally in both directions once VBR is exceeded in either polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN, LIN, sensor bridges) without polarity concerns. |
| 30 kW surge capability (8/20 μs) | Supports high-energy lightning-induced surges per IEC 61000-4-5; clamps to 100 V at 300 A, critical for telecom and industrial fieldbus interfaces. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response), improving protection margin for sub-20 V logic and analog front-ends. |
| UL 497B recognition (E136766) | Validates safety compliance for telecom and industrial interface protection circuits requiring certified surge components. |
| Junction capacitance ≤45 pF @ VWM | Preserves signal integrity on high-speed lines (e.g., USB 2.0, RS-485) without introducing excessive loading or timing skew. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs and body control modules from load dump (ISO 16750-2 Pulse b) and inductive switch-off spikes (ISO 7637-2 Pulse 2a). IC Role / Device Role / Timing Role: Parallel-connected TVS providing low-impedance shunt path during >100 V transients, clamping within nanoseconds to limit MOSFET gate-source and supply rail overstress. Use Value: Enables use of cost-effective 60 V-rated power FETs and LDOs by holding rail voltage ≤77.4 V during 3000 W surges, reducing BOM cost vs. higher-voltage alternatives. |
Use Scenario: Shielding analog outputs (4–20 mA, 0–10 V) and digital sensor buses (I²C, SPI) in factory automation PLC I/O modules from ground bounce and EFT. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed at connector entry point, absorbing ±2 kV EFT bursts (IEC 61000-4-4) and 30 kV HBM ESD (IEC 61000-4-2). Use Value: Prevents latch-up and parametric shift in precision ADCs and op-amps by limiting input voltage excursion to <77.4 V, maintaining measurement accuracy across 10⁵+ surge events. |
| Automotive CAN/LIN Bus Protection | Telecom DC Power Input Protection |
|
Use Scenario: Safeguarding CAN transceivers (e.g., TJA1042, SN65HVD230) in vehicle networking nodes against battery disconnect transients and electrostatic discharge. IC Role / Device Role / Timing Role: Common-mode TVS across CAN_H/CAN_L differential pair, clamping common-mode surges while preserving differential signaling integrity. Use Value: Maintains CAN bus uptime by preventing transceiver shutdown or damage during ISO 7637-2 Pulse 1 (−150 V) and Pulse 3b (+150 V) events, with <45 pF capacitance avoiding bit-rate degradation. |
Use Scenario: Protecting primary DC input (−48 V or +24 V) of telecom base station power supplies and remote radio units from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage shunt protector rated for 30 kW (8/20 μs), diverting >95% of surge energy before secondary MOV or GDT stages. Use Value: Extends system MTBF by absorbing 300 A/8/20 μs surges without degradation, meeting GR-1089-CORE Level 3 telecom immunity requirements with no derating needed up to +85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-E3/5A (Vishay) | Lower PPPM (400 W), SMA package (smaller footprint), same VWM/VBR range, unidirectional only. | Limited to single-polarity protection; unsuitable for CAN or AC-coupled signals without external diode pairing. | Select when space-constrained and only unidirectional surges occur (e.g., DC power rails with known polarity). |
| 1.5KE48CA (ON Semiconductor) | Higher RthJA (100 °C/W), axial DO-201 package, same 48 V VWM, 3000 W rating, AEC-Q101 not claimed. | Not qualified for automotive use; requires through-hole mounting and larger board area; less suitable for automated SMT assembly. | Choose for legacy through-hole designs or non-automotive industrial applications where AEC-Q101 is not mandated. |
Compared with SMAJ48A-E3/5A and 1.5KE48CA, the SMC3K48CAHM3_A delivers automotive-grade reliability in a compact SMC package with true bidirectional clamping, making it the preferred choice for modern SMT-based automotive and industrial systems requiring zero-polarity ambiguity and full AEC-Q101 compliance.
Availability
SMC3K48CAHM3_A is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, telecom power supplies, and sensor interface designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMC3K48CAHM3_A 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 SMC3KxxCAHM3_A series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh automotive and industrial environments where AEC-Q101 qualification and ISO-standard immunity are mandatory.
FAQ
What is the clamping voltage of SMC3K48CAHM3_A under a 10/1000 μs surge?
The SMC3K48CAHM3_A clamps to 77.4 V at 38.8 A under a 10/1000 μs waveform, as specified in the Electrical Characteristics table. This value represents the maximum voltage seen across the device during standardized surge testing and directly determines the protection level delivered to downstream components. The SMC3K48CAHM3_A maintains this clamping performance across its full operating temperature range (−55 °C to +175 °C) with minimal derating.
Is SMC3K48CAHM3_A suitable for automotive applications?
Yes, the SMC3K48CAHM3_A is AEC-Q101 qualified and explicitly tested to ISO 7637-2 (Pulse 1, 2a, 3a, 3b) and ISO 16750-2 (Pulse b) standards for automotive electrical systems. Its SMC package supports automated SMT assembly, and its −55 °C to +175 °C operating range covers under-hood and cabin ECU environments. The SMC3K48CAHM3_A also carries UL 497B recognition (E136766), reinforcing its suitability for safety-critical automotive subsystems.
What is the difference between SMC3K48CAHM3_A and SMC3K48A-HM3_A?
The "C" in SMC3K48CAHM3_A denotes bidirectional configuration, whereas SMC3K48A-HM3_A (if it exists) would be unidirectional. The SMC3K48CAHM3_A has symmetrical clamping for both polarities and no polarity marking, while unidirectional variants require correct orientation during placement. All documented parameters - VWM = 48 V, VBR = 53.3–58.9 V, VC = 77.4 V - apply exclusively to the bidirectional SMC3K48CAHM3_A. No unidirectional variant with identical suffix is listed in the source document.
Does SMC3K48CAHM3_A meet JEDEC moisture sensitivity requirements?
Yes, the SMC3K48CAHM3_A meets MSL Level 1 per J-STD-020, with a maximum lead finish reflow peak temperature of 260 °C. This allows indefinite floor life at standard humidity conditions and eliminates bake requirements prior to reflow soldering. The SMC3K48CAHM3_A's halogen-free molding compound and matte tin plating further ensure process compatibility with modern lead-free assembly lines.
What is the thermal resistance of SMC3K48CAHM3_A, and how does it affect layout design?
The SMC3K48CAHM3_A has a junction-to-ambient thermal resistance (RthJA) of 90 °C/W when mounted on a standard FR4 PCB per JEDEC 51-2A. This value guides copper pour sizing and thermal via placement: for repeated surge duty, designers should allocate ≥100 mm² of 2 oz. copper connected to both terminals with ≥4 thermal vias (0.3 mm diameter) per pad. The SMC3K48CAHM3_A's RthJM of 4.0 °C/W (junction-to-mount) further supports thermal coupling to metal-core or heatsinked boards in high-power applications.
SMC3K48CAHM3_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):
- 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:
- 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)
SMC3K48CAHM3_A/H FAQ
1.How can I place an order for SMC3K48CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K48CAHM3_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 SMC3K48CAHM3_A/H reliable?
The price and inventory of SMC3K48CAHM3_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 SMC3K48CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMC3K48CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K48CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K48CAHM3_A/H?
SMC3K48CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K48CAHM3_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 SMC3K48CAHM3_A/H?
For technical support, including SMC3K48CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K48CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K48CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K48CAHM3_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 SMC3K48CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMC3K48CAHM3_A/H?
All SMC3K48CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K48CAHM3_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 SMC3K48CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMC3K48CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K48CAHM3_A/H Tags
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