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Vishay General Semiconductor - Diodes Division SMC3K70CAHM3_A/I
- Part No.:
- SMC3K70CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K70CAHM3_A/I.pdf
- Description:
- 3KW, 70V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,217
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Product details
Overview
SMC3K70CAHM3_A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 3000 W peak pulse power (10/1000 μs), 70 V stand-off voltage, and 113 V maximum clamping voltage at 26.5 A. It protects automotive power electronics, sensor signal lines, and MOSFET gate drivers against ISO 7637-2 and ISO 16750-2 transients.
For engineers reviewing the SMC3K70CAHM3_A datasheet, SMC3K70CAHM3_A pinout, SMC3K70CAHM3_A application, or SMC3K70CAHM3_A equivalent, this device delivers AEC-Q101 qualification, 30 kV ESD immunity per IEC 61000-4-2, UL 497B safety recognition, and MSL Level 1 moisture sensitivity - critical for automotive-grade board-level surge resilience.
Technical Context
This TVS diode operates bidirectionally across ±70 V stand-off range, clamping transients to ≤113 V at 26.5 A (10/1000 μs) and ≤146 V at 205 A (8/20 μs), enabling robust protection of 12 V and 24 V automotive systems. Its low incremental surge resistance and fast response time ensure minimal overvoltage exposure during load dump or inductive switching events.
Thermal performance is defined by RthJA = 90 °C/W and RthJM = 4.0 °C/W, supporting reliable operation up to +175 °C junction temperature. The device meets JESD201 Class 2 whisker resistance and halogen-free, RoHS-compliant construction per HM3 suffix requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 70 V - Maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 77.8–86.0 V at 1 mA - Confirmed voltage threshold where device enters avalanche conduction |
| Clamping Voltage (VC) | 113 V at 26.5 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge |
| Peak Pulse Power (PPPM) | 3000 W (10/1000 μs) - Sustained transient energy absorption capability without failure |
| ESD Withstand (IEC 61000-4-2) | ±30 kV contact & air discharge - Full-system ESD hardening without external shielding |
| Junction Temperature Range | −55 °C to +175 °C - Validated operation across full automotive under-hood thermal envelope |
| AEC-Q101 Qualified | Yes - Certified for automotive electronic modules per stress test standard |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with unmarked cathode/anode terminals - polarity identified by physical orientation on PCB per JEDEC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Transient current sink (bidirectional) | Accepts reverse surge current during negative transients; no marking on bidirectional types |
| Cathode (Opposite Band Side) | Transient current sink (bidirectional) | Accepts forward surge current during positive transients; terminal symmetry enables layout flexibility |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled and differential signal paths without polarity constraints |
| 30 kW surge rating (8/20 μs) | Withstands high-current lightning-induced surges common in vehicle power distribution networks |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage stress on downstream ICs while maintaining margin above system rail |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free assembly without pre-baking or special handling |
| UL 497B recognized (E136766) | Meets safety agency requirements for primary-side surge protection in automotive ECUs |
Applications
| Automotive Body Control Module (BCM) | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protects BCM microcontroller supply rails and LIN bus transceivers from battery line transients during load dump and jump-start events. IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point to limit voltage excursion before LDOs and logic ICs. Use Value: Clamps ISO 16750-2 Pulse b (load dump) to ≤146 V, preventing latch-up or permanent damage to 5 V/3.3 V regulators and CAN/LIN PHYs. |
Use Scenario: Shields ECU main 12 V input against ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2a (alternator field decay). IC Role / Device Role / Timing Role: First-line transient suppressor upstream of DC-DC converters and high-side drivers. Use Value: Limits clamping voltage to 113 V at 26.5 A, ensuring downstream 100 V-rated MOSFETs and gate drivers remain within safe SOA limits. |
| Automotive Sensor Signal Conditioning | Industrial CAN Bus Node Protection |
Use Scenario: Guards analog outputs of pressure/temperature sensors connected to engine bay harnesses exposed to ignition noise and relay switching. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) bidirectional clamp on differential sensor pairs (e.g., RTD bridges, Hall-effect outputs). Use Value: Maintains signal integrity with <1.0 μA leakage at 70 V, while clamping ESD spikes to <113 V before reaching precision ADC front-ends. |
Use Scenario: Protects isolated CAN transceivers in factory automation nodes subjected to long cable runs and ground potential differences. IC Role / Device Role / Timing Role: Common-mode surge suppressor across CAN_H/CAN_L pair, referenced to chassis ground. Use Value: Absorbs 8/20 μs surges up to 205 A without degradation, preserving bit error rate and meeting IEC 61000-4-5 Level 4 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CA | Lower PPPM (400 W), SMA package, higher VC/VWM ratio (1.71) | Not AEC-Q101 qualified; limited to consumer/industrial use | Select when cost-sensitive non-automotive designs require basic 70 V clamping with lower surge duty cycle |
| SMCJ70CA | Same SMC package, identical VWM/VBR, but rated for 1500 W (10/1000 μs) and not AEC-Q101 qualified | Lacks automotive qualification and UL 497B recognition; lower surge margin | Choose only for legacy industrial designs where AEC-Q101 and UL certification are not required |
Compared with SMAJ70CA and SMCJ70CA, SMC3K70CAHM3_A provides triple the peak pulse power (3000 W vs. 400 W/1500 W), AEC-Q101 validation, and UL safety listing - making it the sole option for new automotive power rail and signal line protection where reliability under sustained surge stress is mandatory.
Availability
SMC3K70CAHM3_A is available at Aetrix Electronics and suitable for automotive body control modules, engine control units, sensor interface circuits, and industrial CAN bus nodes requiring stable component supply with guaranteed long-term manufacturability.
Supply support for SMC3K70CAHM3_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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMC3KxxCAHM3_A series is part of Vishay's TRANSZORB® automotive TVS platform, engineered specifically for AEC-Q101 compliance and ISO 7637/16750 transient immunity in harsh-temperature vehicle environments.
FAQ
What is the maximum clamping voltage of SMC3K70CAHM3_A under a 10/1000 μs surge?
The maximum clamping voltage of SMC3K70CAHM3_A is 113 V at 26.5 A under a 10/1000 μs waveform, as specified in the Electrical Characteristics table. This value defines the upper voltage limit imposed on protected circuitry during standardized surge testing and ensures compatibility with 100 V-rated downstream components. SMC3K70CAHM3_A maintains this clamping performance across its full operating temperature range.
Is SMC3K70CAHM3_A qualified for automotive applications?
Yes, SMC3K70CAHM3_A is AEC-Q101 qualified and explicitly listed as such in the Mechanical Data section of the Vishay datasheet (Document Number 98241). It also meets ISO 7637-2 and ISO 16750-2 immunity standards, carries UL 497B safety recognition (file E136766), and is constructed with halogen-free, RoHS-compliant materials per HM3 suffix - confirming its suitability for automotive electronic control units and sensor modules.
What does the "HM3_A" suffix indicate in SMC3K70CAHM3_A?
The "HM3_A" suffix in SMC3K70CAHM3_A denotes Vishay's high-reliability, automotive-grade variant: "H" indicates halogen-free molding compound, "M3" confirms compliance with JESD201 Class 2 whisker resistance, and "_A" specifies AEC-Q101 qualification. This suffix differentiates it from commercial-grade equivalents and guarantees material robustness, solderability, and long-term stability in automotive thermal and vibration environments.
Can SMC3K70CAHM3_A be used for both positive and negative transient suppression?
Yes, SMC3K70CAHM3_A is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative voltage transients. Its breakdown voltage range (77.8–86.0 V) and clamping behavior apply equally in either polarity, making it ideal for protecting AC-coupled signals, differential buses like CAN, and unipolar supplies subject to reverse-polarity faults or inductive kickback.
What is the thermal resistance from junction to ambient for SMC3K70CAHM3_A?
The thermal resistance from junction to ambient (RthJA) for SMC3K70CAHM3_A is 90 °C/W, measured per JEDEC 51-2A on an FR4 PCB with 2 oz. copper and standard footprint. This value is critical for calculating junction temperature rise under sustained surge conditions and confirms the device's ability to operate reliably at up to +175 °C junction temperature in automotive under-hood applications.
SMC3K70CAHM3_A/I 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:
- 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)
SMC3K70CAHM3_A/I FAQ
1.How can I place an order for SMC3K70CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K70CAHM3_A/I 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_A/I reliable?
The price and inventory of SMC3K70CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K70CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMC3K70CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K70CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K70CAHM3_A/I?
SMC3K70CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K70CAHM3_A/I 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_A/I?
For technical support, including SMC3K70CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K70CAHM3_A/I requirements.
6.How does Aetrix verify that SMC3K70CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMC3K70CAHM3_A/I 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_A/I meets industry standards.
7.What is the process for return or replacement of SMC3K70CAHM3_A/I?
All SMC3K70CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K70CAHM3_A/I, 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_A/I part is unused and in its original packaging.
Return procedure for SMC3K70CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K70CAHM3_A/I Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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