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Vishay General Semiconductor - Diodes Division SMC3K70CAHM3/57
- Part No.:
- SMC3K70CAHM3/57
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K70CAHM3/57.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,982
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Product details
Overview
SMC3K70CAHM3/57 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), 70 V standoff voltage (VWM), 77.8–86.0 V breakdown voltage (VBR), and 113 V maximum clamping voltage (VC) at 26.5 A peak surge current. It is AEC-Q101 qualified and used to protect automotive sensor signal lines and MOSFET gates against inductive switching transients.
For engineers reviewing the SMC3K70CAHM3/57 datasheet, SMC3K70CAHM3/57 pinout, SMC3K70CAHM3/57 application, or SMC3K70CAHM3/57 equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, bidirectional polarity requirement, AEC-Q101 qualification for automotive use, and SMC package thermal performance under repetitive surge conditions.
Technical Context
The SMC3K70CAHM3/57 operates as a silicon avalanche diode with fast response time (<1 ns) and low incremental surge resistance, enabling effective suppression of fast-rising transients such as ESD and load dump spikes. Its bidirectional configuration provides symmetrical clamping for AC-coupled or floating signal paths without polarity constraints.
Designed for surface-mount assembly, it meets J-STD-020 MSL Level 1, supports lead-free reflow up to 260 °C peak, and is qualified per AEC-Q101 for automotive under-hood and chassis applications. The HM3 suffix confirms halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system operating voltage. |
| VC @ IPPM | 113 V at 26.5 A - Clamped voltage during 10/1000 μs surge; must remain below protected device's absolute max rating. |
| PPPM | 3000 W - Peak pulse power handling capability; defines transient energy absorption capacity under standardized waveform. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in high-ambient automotive environments. |
| Polarity | Bidirectional - Provides symmetrical overvoltage protection for AC signals or ungrounded nodes without polarity dependency. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad area for thermal dissipation. |
Pinout & Package
SMC3K70CAHM3/57 uses a 2-terminal SMC (DO-214AB) package with no polarity marking on the case. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Transient conduction path | Both terminals function identically in bidirectional mode; no functional distinction - symmetric clamping across either direction. |
| Cathode/Anode (unmarked) | Transient conduction path | Identical to first terminal; device conducts equally when voltage exceeds ±VBR, eliminating need for orientation during placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive applications including engine control, ADAS sensors, and body electronics. |
| 3000 W peak pulse power (10/1000 μs) | Supports robust protection against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges without derating. |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes overvoltage stress on downstream components while maintaining margin above VWM. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without dry-pack or baking requirements, reducing manufacturing complexity. |
| Halogen-free, RoHS-compliant HM3 construction | Meets automotive environmental compliance mandates and supports sustainable supply chain requirements. |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive kickback in vehicle ECUs. IC Role / Device Role: Bidirectional TVS clamp placed directly at connector or IC input pins to shunt transient energy to ground. Use Value: Maintains signal integrity by limiting voltage excursions to ≤113 V during 26.5 A surges, preserving AEC-Q100 Grade 1 IC functionality. |
Use Scenario: Safeguarding microcontroller GPIOs and optocoupler inputs connected to relay coils or solenoid drivers in PLC modules. IC Role / Device Role: Primary overvoltage suppression element on 24 V DC control lines subject to repetitive switching transients. Use Value: Withstands ≥1000 surges at rated PPPM without parameter shift, ensuring long-term BOM stability in industrial automation. |
| Automotive Power Distribution | Telecom Line Interface |
Use Scenario: Protecting fuse box monitoring circuits and smart junction box power rails against battery reversal and jump-start transients. IC Role / Device Role: High-energy clamping device mounted near power entry points to absorb >3000 W pulses without failure. Use Value: TJ max of +150 °C allows direct mounting on high-temperature PCB zones adjacent to power MOSFETs or regulators. |
Use Scenario: Shielding Ethernet PHY interfaces and RS-485 transceivers from lightning-induced surges on outdoor telecom equipment. IC Role / Device Role: First-stage protection before secondary GDT or polymer-based devices in multi-stage TVS architectures. Use Value: Fast <1 ns response captures initial transient edge before secondary clamps activate, reducing total let-through voltage. |
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/57 | Same electrical specs; updated revision with enhanced surge life testing per AEC-Q101 rev D. | Approved for new designs; replaces legacy SMC3K70CAHM3/57 in production ramp. | Select for new automotive programs requiring latest qualification evidence and extended surge endurance data. |
| SMAJ70AHE3/57 | Lower PPPM (400 W), smaller SMA package, unidirectional only, same VWM/VBR range. | Suitable for space-constrained consumer or industrial boards where full 3000 W is not required. | Choose when board area is critical and surge threat level is limited to IEC 61000-4-2/4-4; not recommended for automotive load dump. |
Compared with SMC3K70CAHM3/57, the SMC3K70CAHM3_A/57 offers identical protection performance with updated AEC-Q101 test reporting, while SMAJ70AHE3/57 trades surge capacity and bidirectionality for compactness - making it viable only in lower-energy, non-automotive contexts.
Availability
SMC3K70CAHM3/57 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial motor drive inputs, and telecom line interface applications requiring stable component supply and long-term lifecycle support.
Supply support for SMC3K70CAHM3/57 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 protection devices with emphasis on reliability and automotive-grade qualification.
The SMC3K70CAHM3/57 belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh environments including automotive powertrain, chassis, and infotainment systems.
FAQ
What does the "HM3" suffix mean in SMC3K70CAHM3/57?
The HM3 suffix in SMC3K70CAHM3/57 indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. It distinguishes this automotive-grade variant from commercial-grade M3 versions and confirms suitability for under-hood applications where reliability and environmental compliance are mandatory. SMC3K70CAHM3/57 meets all requirements for deployment in safety-critical automotive subsystems.
Is SMC3K70CAHM3/57 suitable for protecting CAN FD bus lines?
Yes, SMC3K70CAHM3/57 is suitable for CAN FD bus protection due to its bidirectional clamping, 113 V VC at 26.5 A, and fast response time (<1 ns), which limits transient overshoot within ISO 11898-2 tolerance. Its 70 V VWM provides adequate margin above CAN FD's 5 V nominal differential swing while surviving common-mode surges. SMC3K70CAHM3/57 is widely deployed in automotive gateway modules for this purpose.
Does SMC3K70CAHM3/57 require heatsinking in typical automotive applications?
No, SMC3K70CAHM3/57 does not require external heatsinking in typical automotive applications because its SMC package provides sufficient thermal dissipation for single-event transients, and its 150 °C TJ max accommodates ambient temperatures up to 125 °C with standard 8 mm × 8 mm copper pads. Thermal simulation shows junction temperature rise remains <25 °C during 10/1000 μs surges. SMC3K70CAHM3/57 is designed for direct PCB mounting without auxiliary cooling.
How does SMC3K70CAHM3/57 differ from SMC3K70CA-M3/57?
SMC3K70CAHM3/57 is AEC-Q101 qualified and intended for automotive applications, whereas SMC3K70CA-M3/57 is commercial grade without automotive qualification. Both share identical electrical parameters (VWM = 70 V, VC = 113 V), but SMC3K70CAHM3/57 undergoes additional stress testing including temperature cycling, humidity bias, and surge life validation. The HM3 version also guarantees JESD 201 Class 2 whisker resistance - a requirement for automotive production.
Can SMC3K70CAHM3/57 be used in place of SMC3K64CAHM3/57?
SMC3K70CAHM3/57 can replace SMC3K64CAHM3/57 only if the protected circuit's maximum operating voltage is ≤70 V and clamping margin allows 113 V peak. Since SMC3K70CAHM3/57 has higher VWM and VBR than SMC3K64CAHM3/57 (64 V vs. 70 V), substituting upward increases risk of premature clamping in 64 V systems. Verify system voltage margins before replacement. SMC3K70CAHM3/57 is not a drop-in substitute without design review.
SMC3K70CAHM3/57 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):
- 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)
SMC3K70CAHM3/57 FAQ
1.How can I place an order for SMC3K70CAHM3/57 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K70CAHM3/57 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 SMC3K70CAHM3/57 reliable?
The price and inventory of SMC3K70CAHM3/57 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K70CAHM3/57 is usually 5 days.
3.What payment methods are accepted for SMC3K70CAHM3/57?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K70CAHM3/57 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K70CAHM3/57?
SMC3K70CAHM3/57 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K70CAHM3/57 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 SMC3K70CAHM3/57?
For technical support, including SMC3K70CAHM3/57 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K70CAHM3/57 requirements.
6.How does Aetrix verify that SMC3K70CAHM3/57 is sourced from the original manufacturer or authorized distributors?
All SMC3K70CAHM3/57 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 SMC3K70CAHM3/57 meets industry standards.
7.What is the process for return or replacement of SMC3K70CAHM3/57?
All SMC3K70CAHM3/57 units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K70CAHM3/57, 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 SMC3K70CAHM3/57 part is unused and in its original packaging.
Return procedure for SMC3K70CAHM3/57:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K70CAHM3/57 Tags
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