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Vishay General Semiconductor - Diodes Division SMC3K22CAHM3/57
- Part No.:
- SMC3K22CAHM3/57
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K22CAHM3/57.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:872
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Product details
Overview
SMC3K22CAHM3/57 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 22 V stand-off voltage, and 84.5 V maximum clamping voltage at 35.5 A peak pulse current. It is AEC-Q101 qualified and designed for automotive-grade surge protection on signal lines and power rails feeding ICs and MOSFETs.
For engineers reviewing the SMC3K22CAHM3/57 datasheet, SMC3K22CAHM3/57 pinout, SMC3K22CAHM3/57 application, or SMC3K22CAHM3/57 equivalent, key selection criteria include clamping voltage margin relative to protected device VDS/VCC, bidirectional polarity requirement, AEC-Q101 qualification status, and SMC package thermal dissipation capability under repetitive surge conditions.
Technical Context
The SMC3K22CAHM3/57 operates as a silicon avalanche diode with precise breakdown voltage range of 24.4 V to 26.9 V at 1 mA test current, enabling reliable turn-on during transients exceeding 22 V. Its low incremental surge resistance ensures minimal voltage overshoot during high-current events.
Designed for unidirectional PCB mounting per J-STD-020 MSL level 1, it features matte tin-plated leads compliant with JESD 22-B102 solderability and JESD 201 class 2 whisker resistance. The device is not recommended for bottom-side wave soldering due to thermal stress limitations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines upper limit of normal signal/power rail operation. |
| VBR min/max | 24.4 V / 26.9 V - Breakdown voltage range at 1 mA; ensures predictable turn-on within tight tolerance for consistent protection timing. |
| VC @ IPPM | 84.5 V - Clamping voltage at 35.5 A peak pulse; determines maximum voltage stress imposed on downstream circuitry during surge. |
| PPPM | 3000 W - Peak pulse power handling (10/1000 μs waveform); supports high-energy transients from inductive switching or ESD. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments with sustained thermal load. |
| Polarity | Bidirectional - Protects against both positive and negative polarity transients without external polarity reversal circuitry. |
| Qualification | AEC-Q101 - Validated for automotive electronic systems requiring robust reliability across temperature cycling, humidity, and mechanical shock. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, molded plastic case with UL 94 V-0 flammability rating; dimensions 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); copper pad area recommendation 8.0 mm × 8.0 mm for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Anode reference terminal for bidirectional conduction | No polarity marking on bidirectional types; terminals are functionally symmetric-either end serves as anode/cathode depending on transient polarity. |
| Anode (unmarked side) | Cathode reference terminal for bidirectional conduction | Terminal symmetry enables single-component placement regardless of signal line polarity; eliminates need for orientation verification during assembly. |
Key Features
| Feature | Design Value |
|---|---|
| Peak pulse power | 3000 W (10/1000 μs) - Enables suppression of high-energy load dump and ISO 7637-2 Pulse 5a transients without degradation. |
| Clamping ratio (VC/VBR) | ~3.1× - Low ratio indicates efficient energy diversion with minimal overvoltage exposure to protected ICs. |
| AEC-Q101 qualification | Validated for automotive Grade 1 (-40 °C to +125 °C ambient) operation - assures reliability in engine control units and ADAS sensor interfaces. |
| Halogen-free & RoHS | HM3 suffix denotes halogen-free molding compound and RoHS compliance - meets automotive OEM material declaration requirements. |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60% RH - simplifies inventory management and eliminates bake-out prior to reflow. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppresses load dump transients (up to 60 V, 400 ms) on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role: Primary clamping element placed between battery rail and input stage of power management IC. Use Value: Limits voltage seen by downstream LDOs and microcontrollers to ≤84.5 V, preventing latch-up or oxide rupture during ISO 16750-2 tests. | Use Scenario: Shields analog front-end inputs of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role: Bidirectional shunt protector on 4–20 mA current loop or RS-485 differential pair. Use Value: Maintains signal integrity during 4 kV EFT bursts by clamping common-mode surges below sensor IC absolute maximum ratings. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
Use Scenario: Guards AC-DC adapter primary-side controller ICs against lightning-induced surges on mains input. IC Role / Device Role: Secondary-level TVS after MOV, providing fast-response clamping for residual fast-rising transients. Use Value: Responds in <1 ps to sub-microsecond spikes, complementing slower MOVs to meet IEC 61000-4-5 Level 3 immunity requirements. | Use Scenario: Protects PoE-powered network switches from induced surges on 48 V DC distribution lines. IC Role / Device Role: Point-of-load TVS on midspan injector output or PSE controller supply rail. Use Value: Withstands repeated 10/1000 μs surges up to 3000 W without parameter drift, ensuring long-term uptime in telecom infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K22CAHM3_A | Same electrical specs and AEC-Q101 qualification; updated suffix denotes revised manufacturing flow and enhanced traceability. | Identical use cases; approved for new designs where SMC3K22CAHM3/57 is marked "Not for New Designs". | Select SMC3K22CAHM3_A for production ramp or long-term design-in; verify reel packaging code compatibility (e.g., /57 vs /A). |
| SMBJ22CA | Lower peak pulse power (600 W), same VWM/VC but higher incremental resistance; SMB package (smaller thermal mass). | Suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD); not recommended for load dump or ISO 7637-2 Pulse 5a. | Use SMBJ22CA only when surge energy is confirmed ≤600 W and board space constraints prohibit SMC footprint. |
Compared with SMC3K22CAHM3/57, SMC3K22CAHM3_A offers identical protection performance with updated process controls for extended lifecycle support, while SMBJ22CA trades 80 % peak power capacity for 30 % smaller PCB area-making it viable only in low-energy consumer applications.
Availability
SMC3K22CAHM3/57 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, and telecom power feeds requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMC3K22CAHM3/57 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 passive components with emphasis on high-reliability industrial and automotive applications.
The SMC3KxxCA series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, balancing high pulse power, tight VBR tolerance, and robust thermal performance in the SMC package.
FAQ
What does the "HM3" suffix indicate in SMC3K22CAHM3/57?
The HM3 suffix in SMC3K22CAHM3/57 specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD 201 class 2 whisker resistance. It distinguishes this grade from commercial M3 variants and confirms suitability for automotive applications requiring stringent material and reliability standards. SMC3K22CAHM3/57 meets UL 497B safety recognition and MS L level 1 moisture sensitivity.
Is SMC3K22CAHM3/57 suitable for protecting CAN bus lines?
SMC3K22CAHM3/57 is not optimized for CAN bus protection due to its 84.5 V clamping voltage, which exceeds typical CAN transceiver absolute maximum ratings (±40 V). For CAN FD or high-speed CAN, lower-clamp devices like SMAJ24A or dedicated CAN TVS arrays are preferred. SMC3K22CAHM3/57 remains appropriate for 12 V power rail protection upstream of the CAN module's power supply.
Why is SMC3K22CAHM3/57 marked "Not for New Designs"?
SMC3K22CAHM3/57 is designated "Not for New Designs" because Vishay has introduced the enhanced SMC3K22CAHM3_A variant with improved process control and extended product lifecycle support. While SMC3K22CAHM3/57 remains fully functional and available for legacy production, new designs should adopt SMC3K22CAHM3_A to ensure long-term supply continuity and access to latest quality enhancements.
What is the maximum allowable surge current for SMC3K22CAHM3/57 at 100 °C ambient?
At TA = 100 °C, the peak pulse current (IPPM) for SMC3K22CAHM3/57 is derated to approximately 22.5 A, based on the derating curve in Figure 2 of datasheet 89433. This corresponds to ~65 % of its 25 °C rating (35.5 A), preserving safe junction temperature margins. Derating must be applied for sustained operation above 25 °C ambient.
Does SMC3K22CAHM3/57 require orientation-specific placement on PCB?
No, SMC3K22CAHM3/57 does not require orientation-specific placement because it is a bidirectional TVS diode with symmetric terminals. The device lacks polarity marking per datasheet note, and either end functions as anode or cathode depending on transient polarity. This simplifies automated placement and eliminates orientation-related assembly errors in production.
SMC3K22CAHM3/57 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 84.5A
- 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)
SMC3K22CAHM3/57 FAQ
1.How can I place an order for SMC3K22CAHM3/57 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K22CAHM3/57 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 SMC3K22CAHM3/57 reliable?
The price and inventory of SMC3K22CAHM3/57 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K22CAHM3/57 is usually 5 days.
3.What payment methods are accepted for SMC3K22CAHM3/57?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K22CAHM3/57 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K22CAHM3/57?
SMC3K22CAHM3/57 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K22CAHM3/57 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 SMC3K22CAHM3/57?
For technical support, including SMC3K22CAHM3/57 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K22CAHM3/57 requirements.
6.How does Aetrix verify that SMC3K22CAHM3/57 is sourced from the original manufacturer or authorized distributors?
All SMC3K22CAHM3/57 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 SMC3K22CAHM3/57 meets industry standards.
7.What is the process for return or replacement of SMC3K22CAHM3/57?
All SMC3K22CAHM3/57 units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K22CAHM3/57, 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 SMC3K22CAHM3/57 part is unused and in its original packaging.
Return procedure for SMC3K22CAHM3/57:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K22CAHM3/57 Tags
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