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Vishay General Semiconductor - Diodes Division SMC3K33CAHM3/9A
- Part No.:
- SMC3K33CAHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K33CAHM3/9A.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,138
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Product details
Overview
SMC3K33CAHM3/9A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), with breakdown voltage 36.7–40.6 V, stand-off voltage 33 V, and clamping voltage 53.3 V at 56.3 A. It is AEC-Q101 qualified and used to protect automotive sensor signal lines against inductive switching transients.
For engineers reviewing the SMC3K33CAHM3/9A datasheet, SMC3K33CAHM3/9A pinout, SMC3K33CAHM3/9A application, or SMC3K33CAHM3/9A equivalent, key selection criteria include bidirectional clamping capability, 150 °C max junction temperature, MSL level 1 rating, halogen-free RoHS-compliant construction, and compatibility with wave-soldering restrictions on PCB bottom side mounting.
Technical Context
This TVS diode operates as a voltage-clamped surge protector using avalanche breakdown. Its bidirectional polarity enables symmetrical transient suppression on AC or differential signal paths without polarity sensitivity. The device responds in sub-nanosecond time and maintains low incremental surge resistance under 3000 W pulses.
Designed for automotive-grade reliability, SMC3K33CAHM3/9A meets AEC-Q101 stress testing requirements and UL 497B safety certification (E136766). Its SMC package supports high thermal dissipation and conforms to J-STD-020 MSL level 1, with matte tin-plated leads compliant to JESD 22-B102 solderability and JESD 201 class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 3000 W (10/1000 μs waveform) - sustains high-energy surges common in automotive load-dump and inductive switch-off events |
| Breakdown Voltage VBR | 36.7–40.6 V at 1.0 mA - defines precise avalanche initiation threshold for predictable clamping onset |
| Stand-off Voltage VWM | 33 V - maximum continuous reverse voltage before leakage exceeds 2.0 μA, ensuring no conduction during normal operation |
| Clamping Voltage VC | 53.3 V at 56.3 A - limits transient voltage seen by protected ICs to safe levels during full-rated surge |
| Junction Temperature Range | −55 °C to +150 °C - supports under-hood automotive deployment and industrial environments with wide thermal cycling |
| Package | SMC (DO-214AB) - standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad area for optimal thermal performance |
| Qualification | AEC-Q101 qualified - validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and ESD |
Pinout & Package
SMC3K33CAHM3/9A uses the standard SMC (DO-214AB) package: molded epoxy case with two coplanar terminals, dimensions 7.11 mm × 6.22 mm × 2.62 mm (L × W × H), UL 94 V-0 rated, matte tin-plated leads. Polarity is unmarked due to bidirectional function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Surge current return path | Both terminals are electrically symmetric; either may serve as input or return depending on transient polarity - no directional marking required |
| Anode (Cathode) | Surge current entry point | Identical terminal structure ensures identical clamping behavior for positive or negative transients - eliminates orientation constraints during placement |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential interfaces (e.g., CAN, LIN, sensor bridges) without polarity concerns |
| 3000 W peak pulse power | Withstands severe ISO 7637-2 Pulse 5a load-dump surges in 12 V automotive systems without degradation |
| AEC-Q101 qualification | Validates long-term reliability under automotive thermal, mechanical, and humidity stresses - suitable for safety-critical ECUs |
| MSL Level 1 (260 °C) | Allows standard reflow soldering without moisture-related popcorn failure - no baking required prior to assembly |
| Halogen-free & RoHS-compliant | Meets global environmental compliance mandates (IEC 61249-2-21) and supports lead-free manufacturing processes |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure or temperature sensors in engine control modules exposed to alternator load dump and relay coil flyback. IC Role / Device Role / Timing Role: Voltage-clamping transient suppressor placed directly at connector interface to shunt surge energy before it reaches precision ADC front-end. Use Value: Limits transient voltage to ≤53.3 V, preventing latch-up or permanent damage to 3.3 V or 5 V sensor signal conditioning ICs. |
Use Scenario: Shielding 24 V DC digital input channels in programmable logic controllers from field-wiring induced surges during maintenance or cable coupling. IC Role / Device Role / Timing Role: Standoff-mode protector across input terminals, conducting only during overvoltage events exceeding 33 V. Use Value: Maintains <2.0 μA leakage at 24 V nominal, preserving input logic thresholds while clamping 1 kV/μs transients to safe levels. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul equipment connected to outdoor cabling susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between differential pair and transceiver, referenced to local ground. Use Value: Symmetric 53.3 V clamping prevents differential-mode overvoltage from exceeding transceiver absolute maximum ratings (±12 V). |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machine control boards during direction reversal and speed changes. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to clamp inductive kickback before it couples into MCU power rails. Use Value: Absorbs 3000 W peak energy without failure, eliminating need for bulkier MOV-based solutions and reducing board space by >40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K33CAHM3_A/9A | Same electrical specs and AEC-Q101 qualification; updated suffix denotes revised internal process control and tighter VBR distribution (±5% vs ±6%) | Identical use cases; preferred for new designs requiring enhanced parametric consistency | Select SMC3K33CAHM3_A/9A when tighter breakdown tolerance and latest revision compliance are required |
| SMAJ33CA | Lower peak pulse power (400 W), SMA package (smaller footprint, lower thermal mass), same VWM/VC but higher dynamic impedance | Suitable for low-energy consumer electronics; not recommended for automotive or industrial surge immunity | Choose SMAJ33CA only for cost-sensitive, non-automotive applications where 400 W surge margin is sufficient |
Compared with SMC3K33CAHM3/9A, SMC3K33CAHM3_A/9A offers improved VBR consistency for tighter system-level margining, while SMAJ33CA trades robustness for size and cost - making the original SMC3K33CAHM3/9A optimal for demanding AEC-Q101 applications requiring 3000 W surge handling.
Availability
SMC3K33CAHM3/9A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface surge suppression requiring stable component supply and long-lifecycle support.
Supply support for SMC3K33CAHM3/9A 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, MOSFETs, and protection devices with emphasis on high-reliability, high-power, and automotive-qualified components.
The SMC3KxxCA family was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive and industrial environments, prioritizing high peak power density, low clamping ratio, and robust thermal performance in surface-mount form.
FAQ
What does the "HM3" suffix mean in SMC3K33CAHM3/9A?
The HM3 suffix in SMC3K33CAHM3/9A indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this grade from commercial M3 variants by adding automotive stress validation, JESD 201 class 2 whisker resistance, and enhanced reliability screening - all confirmed in Vishay document 89433.
Is SMC3K33CAHM3/9A suitable for 24 V industrial control systems?
Yes, SMC3K33CAHM3/9A is well-suited for 24 V industrial control systems. With a 33 V stand-off voltage and 53.3 V clamping voltage at 56.3 A, it provides ample margin above 24 V nominal while suppressing transients from relay coils, solenoids, and motor drives - validated by its 3000 W peak pulse rating and −55 °C to +150 °C operating range.
Does SMC3K33CAHM3/9A require orientation during PCB placement?
No, SMC3K33CAHM3/9A does not require specific orientation during PCB placement. As a bidirectional TVS diode, both terminals are functionally identical - there is no cathode/anode marking, and clamping behavior is symmetric for positive and negative transients. This simplifies automated placement and eliminates polarity-related assembly errors.
What is the maximum surge current rating for SMC3K33CAHM3/9A?
The maximum peak pulse current (IPPM) for SMC3K33CAHM3/9A is 56.3 A under the standard 10/1000 μs waveform, as specified in Vishay's Electrical Characteristics table (document 89433, page 2). This value corresponds directly to its 3000 W peak pulse power rating at 53.3 V clamping voltage.
Can SMC3K33CAHM3/9A be used in place of older SMC3K33CA-M3/9A parts?
Yes, SMC3K33CAHM3/9A is a direct functional replacement for SMC3K33CA-M3/9A, with identical electrical parameters and package. The HM3 variant adds AEC-Q101 qualification and whisker-resistant plating - making it backward-compatible while offering enhanced reliability for automotive and industrial use cases where the original M3 part was previously deployed.
SMC3K33CAHM3/9A 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 56.3A
- 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)
SMC3K33CAHM3/9A FAQ
1.How can I place an order for SMC3K33CAHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K33CAHM3/9A 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 SMC3K33CAHM3/9A reliable?
The price and inventory of SMC3K33CAHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K33CAHM3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K33CAHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K33CAHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K33CAHM3/9A?
SMC3K33CAHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K33CAHM3/9A 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 SMC3K33CAHM3/9A?
For technical support, including SMC3K33CAHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K33CAHM3/9A requirements.
6.How does Aetrix verify that SMC3K33CAHM3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K33CAHM3/9A 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 SMC3K33CAHM3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K33CAHM3/9A?
All SMC3K33CAHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K33CAHM3/9A, 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 SMC3K33CAHM3/9A part is unused and in its original packaging.
Return procedure for SMC3K33CAHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K33CAHM3/9A Tags
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