My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMC3K40CAHM3_A/I
- Part No.:
- SMC3K40CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K40CAHM3_A/I.pdf
- Description:
- 3KW, 40V 5%,BIDIR,SMC TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,089
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMC3K40CAHM3_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), 40 V stand-off voltage, and 64.5 V maximum clamping voltage at 46.5 A IPPM. It protects MOSFETs, ICs, and sensor signal lines in automotive power systems against ISO 7637-2 and ISO 16750-2 transients.
For engineers reviewing the SMC3K40CAHM3_A datasheet, SMC3K40CAHM3_A pinout, SMC3K40CAHM3_A application, or SMC3K40CAHM3_A equivalent, key selection criteria include its AEC-Q101 qualification, 30 kV ESD immunity per IEC 61000-4-2, bidirectional clamping behavior, and compatibility with 12 V battery system load-dump and switching transient protection.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to overvoltage events. Its bidirectional architecture enables symmetrical clamping above and below ground-critical for protecting AC-coupled or floating signal paths in automotive sensor interfaces and power supply rails.
It delivers 3000 W peak pulse power under 10/1000 μs waveform and sustains 30 kW under 8/20 μs surge, with thermal resistance RthJM of 4.0 °C/W enabling robust junction temperature management during repetitive transients. The device meets MSL Level 1 and supports lead-free reflow up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 40 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| Breakdown Voltage (VBR) | 44.4–49.1 V at 1 mA - Voltage at which device enters avalanche conduction; ensures reliable turn-on before downstream component damage. |
| Clamping Voltage (VC) | 64.5 V at 46.5 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; determines minimum safe voltage headroom for ICs/MOSFETs. |
| Peak Pulse Power (PPPM) | 3000 W (10/1000 μs) - Energy-handling capability for standard automotive transients; validates compliance with ISO 7637-2 Pulse 1/2a/3a/3b. |
| ESD Immunity | ±30 kV (IEC 61000-4-2, contact & air) - Robustness against human-body-model electrostatic discharge; eliminates need for additional ESD stages in sensor modules. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock; suitable for under-hood and ADAS applications. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place and reflow. |
Pinout & Package
SMC3K40CAHM3_A uses a 2-terminal SMC (DO-214AB) package with no polarity marking due to its bidirectional construction. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and qualified to JESD 201 Class 2 whisker test.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Bidirectional avalanche junction | No functional distinction between terminals; either terminal may connect to line or ground-enables flexible PCB layout for differential or single-ended protection. |
| Cathode/Anode (unmarked) | Bidirectional avalanche junction | Same physical structure as first terminal; symmetric clamping ensures identical positive/negative surge suppression without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, LIN), and ungrounded power rails without polarity concerns. |
| 3000 W peak pulse power (10/1000 μs) | Meets ISO 7637-2 Pulse 1 (−150 V, 2 ms) and Pulse 2a (112 V, 50 μs) requirements for 12 V automotive systems without derating. |
| AEC-Q101 qualification | Validates long-term reliability in automotive environments including −55 °C to +175 °C junction operation and mechanical vibration endurance. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage stress on protected components-e.g., keeps 40 V-rated MOSFETs safely below breakdown during 64.5 V clamp event. |
| 30 kV HBM ESD rating | Eliminates need for discrete ESD diodes in front-end sensor interfaces, reducing BOM count and board space in compact ECUs. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power rails from load dump and alternator switching transients in body control modules. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between VIN and GND, clamping surges within nanoseconds to prevent MCU brownout or latch-up. Use Value: Withstands ISO 16750-2 Pulse b (load dump) up to 101 V for 400 ms, limiting rail voltage to ≤64.5 V and preserving system uptime. |
Use Scenario: Safeguarding analog output lines of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional TVS connected across sensor output and reference, suppressing inductive kickback from nearby solenoid drivers. Use Value: Clamps ±220 V ISO 7637-2 Pulse 3b transients to ±64.5 V, preventing ADC input saturation and maintaining measurement integrity. |
| Automotive CAN Bus Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Front-end protection for CAN transceivers in infotainment head units exposed to wiring harness coupling noise. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed across CANH–CANL differential pair to suppress common-mode surges without distorting data signals. Use Value: Junction capacitance <100 pF at zero bias preserves CAN FD bit rate integrity up to 5 Mbps while meeting ISO 11898-2 EMC requirements. |
Use Scenario: Overvoltage suppression on BLDC motor phase outputs in smart washing machine inverters subjected to back-EMF spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS on each phase-to-ground path, diverting inductive energy away from gate drivers and current sense amplifiers. Use Value: 30 kW 8/20 μs surge rating handles repeated motor commutation spikes, extending inverter lifespan and reducing field failure rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA | Lower PPPM (400 W), SMA package (smaller footprint, higher thermal resistance), non-AEC-Q101 rated. | Not suitable for automotive under-hood use; limited to consumer or industrial low-energy signal lines. | Select only for cost-sensitive, non-automotive designs where 400 W surge capacity suffices and space is constrained. |
| SMCJ40CA | Same SMC package and 3000 W rating, but not halogen-free or AEC-Q101 qualified; VBR min/max tighter (44.4–47.1 V). | Lacks automotive qualification and RoHS/halogen-free compliance required for Tier 1 OEM programs. | Use when AEC-Q101 and material compliance are not mandated, e.g., industrial control panels with legacy procurement specs. |
Compared with SMAJ40CA and SMCJ40CA, SMC3K40CAHM3_A uniquely combines AEC-Q101 qualification, halogen-free/RoHS compliance, and 30 kV ESD immunity-making it the only choice for new automotive designs requiring full specification alignment and supply-chain traceability.
Availability
SMC3K40CAHM3_A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and consumer appliance motor drives requiring stable component supply, long-term lifecycle support, and certified compliance documentation.
Supply support for SMC3K40CAHM3_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 was developed specifically for AEC-Q101-compliant transient protection in 12 V and 24 V automotive systems, addressing stringent ISO 7637-2 and ISO 16750-2 immunity requirements with enhanced thermal performance.
FAQ
What is the maximum clamping voltage of SMC3K40CAHM3_A at its rated peak pulse current?
The SMC3K40CAHM3_A has a maximum clamping voltage (VC) of 64.5 V at 46.5 A peak pulse current under the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and represents the highest voltage the protected circuit will experience during a defined surge event. The clamping voltage remains stable across temperature and lifetime, ensuring consistent protection margins for downstream ICs and MOSFETs in SMC3K40CAHM3_A-based designs.
Is SMC3K40CAHM3_A suitable for protecting CAN FD bus lines?
Yes, SMC3K40CAHM3_A is suitable for CAN FD bus protection due to its bidirectional operation, low junction capacitance (<100 pF at zero bias), and fast response time. Its clamping voltage of 64.5 V stays well below typical CAN transceiver absolute maximum ratings (often ±40 V common-mode), and its SMC package allows placement directly at connectors. However, for optimal signal integrity at 5 Mbps, layout must minimize trace inductance-confirming that SMC3K40CAHM3_A's performance aligns with ISO 11898-2 EMC test limits in actual board-level validation.
Does SMC3K40CAHM3_A require orientation during PCB placement?
No, SMC3K40CAHM3_A does not require specific orientation during PCB placement because it is a bidirectional TVS diode with no polarity marking on the SMC (DO-214AB) package. Both terminals are functionally identical, allowing either end to connect to the signal line or ground plane. This simplifies assembly, eliminates orientation-related manufacturing defects, and supports symmetric protection schemes-for example, across differential pairs like RS-485 or CAN-without design or layout constraints tied to SMC3K40CAHM3_A polarity.
What automotive standards does SMC3K40CAHM3_A meet?
SMC3K40CAHM3_A meets ISO 7637-2:2011 (Pulse 1, 2a, 3a, 3b), ISO 16750-2 (Pulse b), and IEC 61000-4-2 (±30 kV contact/air discharge). It is also AEC-Q101 qualified and UL recognized (E136766) for safety. These certifications validate its suitability for critical automotive subsystems including engine control units, ADAS cameras, and body electronics-where SMC3K40CAHM3_A provides verified immunity against real-world electrical disturbances encountered in vehicle operation and manufacturing environments.
How does the halogen-free and RoHS-compliant construction of SMC3K40CAHM3_A impact thermal performance?
The halogen-free molding compound in SMC3K40CAHM3_A meets UL 94 V-0 flammability rating without compromising thermal performance: its junction-to-mount thermal resistance (RthJM) remains 4.0 °C/W, identical to halogen-containing equivalents. This ensures no derating is needed for thermal design-SMC3K40CAHM3_A maintains full 3000 W surge capability at 175 °C max junction temperature. The HM3 suffix further guarantees JESD 201 Class 2 whisker resistance, supporting long-term reliability in high-vibration automotive applications using SMC3K40CAHM3_A.
SMC3K40CAHM3_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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 46.5A
- 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)
SMC3K40CAHM3_A/I FAQ
1.How can I place an order for SMC3K40CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K40CAHM3_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 SMC3K40CAHM3_A/I reliable?
The price and inventory of SMC3K40CAHM3_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 SMC3K40CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMC3K40CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K40CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K40CAHM3_A/I?
SMC3K40CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K40CAHM3_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 SMC3K40CAHM3_A/I?
For technical support, including SMC3K40CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K40CAHM3_A/I requirements.
6.How does Aetrix verify that SMC3K40CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMC3K40CAHM3_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 SMC3K40CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMC3K40CAHM3_A/I?
All SMC3K40CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K40CAHM3_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 SMC3K40CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMC3K40CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K40CAHM3_A/I 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
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
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 …
