My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMC3K70CAHM3_A/H
- Part No.:
- SMC3K70CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K70CAHM3_A/H.pdf
- Description:
- 3KW, 70V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:1,964
Please send an inquiry. Send us your inquiry, and we will respond immediately.
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 clamping voltage at 26.5 A peak pulse current. 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, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 175 °C maximum junction temperature, UL 497B safety recognition, and compliance with IEC 61000-4-2 ESD (30 kV contact/air).
Technical Context
This TVS diode operates as a voltage-clamped shunt protector triggered by transient overvoltage events exceeding its 70 V stand-off threshold. Its silicon avalanche structure delivers sub-nanosecond response time and low incremental surge resistance to limit voltage across protected circuits during 10/1000 μs and 8/20 μs waveforms.
The device is rated for 3000 W peak pulse power under 10/1000 μs conditions and sustains 205 A peak pulse current under 8/20 μs waveform. Thermal performance is characterized by 4.0 °C/W junction-to-mount thermal resistance and 90 °C/W junction-to-ambient (JEDEC 51-2A), enabling robust operation in automotive under-hood environments up to 175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| Breakdown Voltage (VBR) | 77.8–86.0 V at 1 mA - Confirmed avalanche initiation range; ensures reliable triggering above VWM with defined tolerance. |
| Clamping Voltage (VC) | 113 V at 26.5 A (10/1000 μs) - Maximum voltage seen by protected circuit during standardized surge; determines downstream component stress. |
| Peak Pulse Power (PPPM) | 3000 W (10/1000 μs) - Energy-handling capacity for automotive load dump and switching transients per ISO 16750-2 Pulse b. |
| ESD Withstand | 30 kV per IEC 61000-4-2 (contact & air) - Enables direct integration on exposed connectors and sensor interfaces without external ESD staging. |
| AEC-Q101 Qualified | Qualified for automotive-grade reliability - Validated for temperature cycling, humidity, mechanical shock, and lifetime surge endurance per AEC stress test requirements. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; supports automated assembly and high-power dissipation. |
Pinout & Package
SMC3K70CAHM3_A uses the SMC (DO-214AB) package: a molded plastic case with two coplanar matte tin-plated leads, compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Polarity is unmarked due to bidirectional symmetry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Surge current return path | Both terminals are electrically symmetric; either lead may serve as input or return depending on PCB layout-no polarity marking required. |
| Anode (Cathode) | Surge current conduction path | Identical terminal function to Cathode; bidirectional operation eliminates need for orientation-specific placement during SMT assembly. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled and differential signal paths without polarity constraints-ideal for CAN, LIN, and sensor bridge outputs. |
| 30 kW surge rating (8/20 μs) | Withstands severe lightning-induced surges per IEC 61000-4-5 Level 4; enables single-device protection for 12 V automotive power rails. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes voltage overshoot during transients-reduces stress on downstream 75 V-rated MOSFETs and microcontrollers. |
| Halogen-free & RoHS-compliant | Meets automotive environmental mandates (ELV, REACH); base P/N HM3_A confirms halogen-free molding compound and lead-free terminations. |
| MSL Level 1 (260 °C) | Enables standard lead-free reflow without moisture sensitivity concerns-eliminates bake requirements prior to assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery line in engine control unit subjected to ISO 16750-2 Pulse b load dump (120 V, 400 ms). IC Role / Device Role / Timing Role: Shunt clamping TVS placed upstream of DC/DC converter input to clamp transient energy before it reaches regulation stage. Use Value: Limits peak rail voltage to 113 V, preventing overvoltage shutdown or damage to 75 V-input buck controller ICs. |
Use Scenario: Analog output line of pressure sensor in HVAC control module exposed to inductive switching noise from solenoid valves. IC Role / Device Role / Timing Role: Bidirectional voltage clamp on 0–5 V ratiometric output, referenced to chassis ground. Use Value: Clamps ±35 V transients (ISO 7637-2 Pulse 3b) to <±113 V, preserving ADC input integrity and avoiding latch-up. |
| Automotive CAN Bus Protection | Telecom DC Power Input Protection |
Use Scenario: CAN_H/CAN_L differential pair in body control module connected to external harness with ESD risk. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) suppressing fast transients while maintaining signal integrity up to 1 Mbps. Use Value: 30 kV IEC 61000-4-2 ESD suppression prevents bus lockup; low capacitance (<100 pF at 0 V) avoids signal edge degradation. |
Use Scenario: 48 V DC input of PoE-powered network switch subjected to induced surges from nearby AC mains wiring. IC Role / Device Role / Timing Role: Primary surge limiter on DC input before hot-swap controller and bulk capacitor. Use Value: Absorbs 3000 W pulses without degradation, maintaining system uptime during building-wide lightning events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CA | Same VWM (70 V) and bidirectional configuration, but lower PPPM (400 W) and smaller SMA package (DO-214AC). | Limited to low-energy transients (e.g., board-level ESD only); unsuitable for ISO 16750-2 load dump or high-current inductive spikes. | Select when space-constrained layouts require smaller footprint and surge energy is ≤400 W. |
| 1.5KE70CA | Through-hole TO-218 package, same VWM and clamping, but higher thermal mass and 1500 W PPPM (10/1000 μs). | Requires manual or wave soldering; better sustained power handling than SMC but incompatible with fully SMT production. | Select for legacy through-hole designs or where higher thermal inertia improves long-pulse survivability beyond 10 ms. |
Compared with SMAJ70CA and 1.5KE70CA, SMC3K70CAHM3_A uniquely combines AEC-Q101 qualification, 3000 W surge rating, SMC surface-mount compatibility, and 30 kV ESD immunity-making it the only option qualified for front-end automotive power rail protection in modern SMT production.
Availability
SMC3K70CAHM3_A is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and CAN/LIN bus interfaces requiring stable component supply across extended product lifecycles.
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, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SMC3KxxCAHM3_A series was developed specifically for AEC-Q101-compliant transient suppression in 12 V/24 V automotive systems, targeting ISO 7637-2 and ISO 16750-2 compliance without external circuitry.
FAQ
What is the maximum clamping voltage of SMC3K70CAHM3_A under a 10/1000 μs surge?
The SMC3K70CAHM3_A clamps to a maximum of 113 V at 26.5 A under the 10/1000 μs waveform. This value is measured and guaranteed per the Vishay datasheet (Document Number 98241, Rev. 09-Jan-2024), and defines the upper voltage limit imposed on protected circuitry during standardized automotive transients such as ISO 7637-2 Pulse 1 and Pulse 3b. The SMC3K70CAHM3_A maintains this clamping performance across its full operating temperature range.
Is SMC3K70CAHM3_A qualified for automotive use?
Yes, SMC3K70CAHM3_A is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, high-temperature operating life, and surge endurance specific to automotive semiconductor reliability requirements. It is explicitly rated for under-hood and powertrain applications with junction temperatures up to +175 °C and meets ISO 7637-2 and ISO 16750-2 immunity standards-key validation points confirmed in the official Vishay qualification report referenced in datasheet 98241.
Does SMC3K70CAHM3_A have polarity markings on the package?
No, SMC3K70CAHM3_A does not have polarity markings because it is a bidirectional TVS diode. Both terminals are functionally identical, allowing either lead to be connected to the line or ground side of the protected circuit. This symmetry simplifies PCB layout and eliminates orientation errors during automated placement-confirmed by Vishay's mechanical drawing and "Polarity: no marking on bidirectional types" note in the datasheet.
What is the junction-to-mount thermal resistance (RthJM) of SMC3K70CAHM3_A?
The junction-to-mount thermal resistance (RthJM) of SMC3K70CAHM3_A is 4.0 °C/W, measured using the JEDEC 51-14 Transient Dual Interface Test Method (TDIM). This low thermal resistance enables efficient heat transfer from the silicon die to the PCB copper pad or heatsink, supporting sustained surge duty cycles in high-temperature automotive environments. The value is specified in the Thermal Characteristics table of the Vishay datasheet (98241, page 3).
Can SMC3K70CAHM3_A replace SMC3K70A in existing designs?
SMC3K70CAHM3_A is not a direct replacement for SMC3K70A due to critical differences: SMC3K70CAHM3_A is bidirectional with "CA" suffix and HM3_A halogen-free/RoHS/AEC-Q101 construction, whereas SMC3K70A is unidirectional and lacks automotive qualification. Substituting them risks incorrect clamping behavior on AC signals or failure to meet automotive reliability requirements. Always verify polarity, qualification status, and surge ratings before interchange-SMC3K70CAHM3_A must be used only where bidirectional protection and AEC-Q101 compliance are required.
SMC3K70CAHM3_A/H 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/H FAQ
1.How can I place an order for SMC3K70CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K70CAHM3_A/H 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/H reliable?
The price and inventory of SMC3K70CAHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMC3K70CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K70CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K70CAHM3_A/H?
SMC3K70CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K70CAHM3_A/H 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/H?
For technical support, including SMC3K70CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K70CAHM3_A/H requirements.
6.How does Aetrix verify that SMC3K70CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMC3K70CAHM3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMC3K70CAHM3_A/H?
All SMC3K70CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K70CAHM3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMC3K70CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K70CAHM3_A/H Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
