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Vishay General Semiconductor - Diodes Division SMC3K70CAHM3/9A
- Part No.:
- SMC3K70CAHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K70CAHM3/9A.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,296
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Product details
Overview
SMC3K70CAHM3/9A 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), with breakdown voltage 77.8–86.0 V, stand-off voltage 70 V, and clamping voltage 113 V at 26.5 A peak surge current. It is AEC-Q101 qualified and used for automotive sensor line protection against load dump and inductive switching transients.
For engineers reviewing the SMC3K70CAHM3/9A datasheet, SMC3K70CAHM3/9A pinout, SMC3K70CAHM3/9A application, or SMC3K70CAHM3/9A 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.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transient overvoltages exceeding its breakdown threshold. Its low incremental surge resistance ensures stable clamping under high-current surges, while the bidirectional polarity supports AC-coupled or floating signal lines without polarity concerns.
The device is designed for unidirectional or bidirectional transient suppression in systems where fast response, repeatable clamping, and high-energy handling are required - particularly in automotive ECUs, industrial motor drives, and telecom interface circuits exposed to ISO 7637-2 or IEC 61000-4-5 threats.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 3000 W (10/1000 μs waveform): sustains single high-energy transients common in automotive load-dump events |
| Breakdown Voltage VBR | 77.8–86.0 V at 1 mA: defines minimum voltage at which clamping initiates, ensuring protection before downstream IC damage |
| Stand-off Voltage VWM | 70 V: maximum continuous reverse working voltage; must exceed system operating voltage to avoid leakage or conduction |
| Clamping Voltage VC | 113 V at 26.5 A IPPM: peak voltage seen by protected circuit during worst-case surge - critical for margin vs. IC absolute max ratings |
| Junction Temperature Range | −55 °C to +150 °C: enables operation in under-hood automotive environments and industrial enclosures without derating |
| Package | SMC (DO-214AB): industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad area for thermal dissipation |
| Qualification | AEC-Q101 qualified: validated for automotive-grade reliability including temperature cycling, HTRB, and surge lifetime testing |
Pinout & Package
SMC3K70CAHM3/9A uses the standard SMC (DO-214AB) package: molded plastic body with two coplanar matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability requirements. Bidirectional configuration means no polarity marking on the case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Surge return path / clamping node | Both terminals are functionally symmetric; connects across protected line and ground (or between differential lines) to clamp bidirectionally |
| Anode (Cathode) | Surge return path / clamping node | Identical role to opposite terminal; no functional distinction - device conducts equally in either direction above VBR |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional polarity | Enables protection of AC-coupled, floating, or differential signal paths without orientation constraints during placement |
| 3000 W peak pulse power | Handles severe transients such as ISO 7637-2 Pulse 5a (load dump) up to 120 V without failure |
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, high-temp reverse bias, and surge endurance |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without preconditioning - simplifies SMT manufacturing |
| Halogen-free & RoHS-compliant | Meets global environmental compliance requirements for automotive and industrial end equipment |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Interface |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor lines (e.g., pressure, temperature) in engine control modules from inductive switching spikes and battery dump events. IC Role / Device Role: Shunt-type transient voltage suppressor placed between signal line and chassis ground. Use Value: Clamps transients to ≤113 V, preserving signal integrity and preventing latch-up or gate oxide rupture in connected MCU or analog front-end ICs. |
Use Scenario: Safeguarding encoder feedback lines and enable/disable signals in variable-frequency drives exposed to back-EMF from large inductive loads. IC Role / Device Role: Bidirectional clamping element across isolated digital or analog control interfaces. Use Value: Maintains signal fidelity during 3 kV/10/1000 μs surges while supporting −55 °C to +150 °C ambient operation in drive cabinets. |
| Telecom Line Interface | Consumer Power Adapter ESD/Transient Suppression |
Use Scenario: Front-end protection for Ethernet PHYs, DSL line drivers, or PoE injectors subject to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role: Primary-level surge suppressor on secondary-side DC lines or data pairs. Use Value: Limits surge energy delivered to downstream TVS arrays or integrated protection ICs, reducing system-level BOM cost and board space. |
Use Scenario: Secondary-side transient suppression in USB-C PD adapters and wireless charging base stations exposed to user-handling ESD and plug-in surges. IC Role / Device Role: Robust, high-power clamping device across 5–20 V output rails before DC-DC converters or USB controllers. Use Value: Survives repeated 3000 W pulses without parameter shift, enabling long-term reliability in consumer field deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K70CAHM3_A | Same electrical specs and AEC-Q101 qualification; differs only in suffix notation - underscore indicates updated revision tracking per Vishay's new naming convention | No functional difference; identical in footprint, thermal performance, and surge lifetime | Select SMC3K70CAHM3_A for new designs requiring latest revision-controlled documentation and traceability |
| SMAJ70CA | Lower peak pulse power (400 W), smaller SMA package (DO-214AC), same VWM/VC but higher incremental resistance | Suitable for lower-energy transients (e.g., IEC 61000-4-2 ESD), not for automotive load dump or ISO 7637-2 | Choose SMAJ70CA only when surge energy is limited and board space is constrained - not a drop-in replacement for SMC3K70CAHM3/9A |
Compared with SMC3K70CAHM3/9A, SMC3K70CAHM3_A offers identical protection performance with enhanced revision control, while SMAJ70CA trades surge robustness for compactness - making it viable only in non-automotive, low-energy applications where 3000 W capability is unnecessary.
Availability
SMC3K70CAHM3/9A is available at Aetrix Electronics and suitable for automotive sensor modules, industrial motor control interfaces, and telecom line protection requiring stable component supply and AEC-Q101-compliant reliability.
Supply support for SMC3K70CAHM3/9A 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-grade solutions.
The SMC3KxxCA family was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive powertrain and chassis systems, industrial automation, and infrastructure equipment where failure is not an option.
FAQ
What does the "HM3" suffix mean in SMC3K70CAHM3/9A?
The "HM3" suffix in SMC3K70CAHM3/9A indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this grade from commercial "M3" variants and confirms compliance with automotive reliability standards including temperature cycling, high-temperature reverse bias, and surge lifetime testing - all verified per JESD47 and AEC-Q101 test plans.
Is SMC3K70CAHM3/9A suitable for ISO 7637-2 Pulse 5a (load dump) protection?
Yes, SMC3K70CAHM3/9A is explicitly rated for 3000 W peak pulse power with a 10/1000 μs waveform, matching the energy profile of ISO 7637-2 Pulse 5a. Its 113 V clamping voltage at 26.5 A provides sufficient margin below typical 12 V system rail absolute maximum ratings (e.g., 13.2 V nominal, 16 V max), making it appropriate for primary-level load dump suppression in automotive ECUs and body control modules.
Does SMC3K70CAHM3/9A have polarity markings on the package?
No, SMC3K70CAHM3/9A is a bidirectional TVS diode and carries no polarity marking on the SMC (DO-214AB) case. Both terminals are functionally identical - the device clamps symmetrically in either direction once the breakdown voltage (77.8–86.0 V) is exceeded. This eliminates orientation concerns during automated placement and simplifies layout for differential or floating signal lines.
What is the maximum operating temperature for SMC3K70CAHM3/9A?
The maximum operating junction temperature for SMC3K70CAHM3/9A is +150 °C, with storage temperature ranging from −55 °C to +150 °C. This rating is validated per AEC-Q101 and allows reliable operation in under-hood automotive environments, industrial motor drive cabinets, and other high-ambient-temperature applications - provided thermal design (copper pad area, airflow, adjacent heat sources) maintains actual junction temperature within limit.
Can SMC3K70CAHM3/9A be used in place of older SMC3K70CA-M3/9A parts?
Yes, SMC3K70CAHM3/9A is a direct functional and mechanical replacement for SMC3K70CA-M3/9A, with identical electrical specifications, SMC (DO-214AB) package dimensions, and solderability. The "HM3" variant adds AEC-Q101 qualification and halogen-free materials, making it suitable for both legacy upgrades and new automotive designs - though Vishay notes the entire SMC3KxxCA series is "Not for New Designs" in favor of the updated SMC3KxxCAHM3_A family.
SMC3K70CAHM3/9A 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 26.5A
- 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)
SMC3K70CAHM3/9A FAQ
1.How can I place an order for SMC3K70CAHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K70CAHM3/9A 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 SMC3K70CAHM3/9A reliable?
The price and inventory of SMC3K70CAHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K70CAHM3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K70CAHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K70CAHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K70CAHM3/9A?
SMC3K70CAHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K70CAHM3/9A 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 SMC3K70CAHM3/9A?
For technical support, including SMC3K70CAHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K70CAHM3/9A requirements.
6.How does Aetrix verify that SMC3K70CAHM3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K70CAHM3/9A 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 SMC3K70CAHM3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K70CAHM3/9A?
All SMC3K70CAHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K70CAHM3/9A, 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 SMC3K70CAHM3/9A part is unused and in its original packaging.
Return procedure for SMC3K70CAHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K70CAHM3/9A Tags
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