My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMC3K40CA-M3/9A
- Part No.:
- SMC3K40CA-M3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K40CA-M3/9A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,773
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMC3K40CA-M3/9A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), and 46.5 A peak pulse current (IPPM). It clamps transients to ≤64.5 V and operates from –55 °C to +150 °C, serving as primary overvoltage protection for automotive sensor signal lines.
For engineers reviewing the SMC3K40CA-M3/9A datasheet, SMC3K40CA-M3/9A pinout, SMC3K40CA-M3/9A application, or SMC3K40CA-M3/9A equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, halogen-free RoHS-compliant construction, and compatibility with wave-soldering restrictions on PCB bottom side.
Technical Context
The SMC3K40CA-M3/9A implements an avalanche-based silicon p-n junction structure optimized for fast transient response (<1 ns) and low incremental surge resistance. Its clamping behavior under 10/1000 μs surges is defined by a maximum VC of 64.5 V at IPPM = 46.5 A, with VBR tested at IT = 1.0 mA and ID ≤ 2.0 μA at VWM.
Designed for unidirectional board-side mounting, it meets J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance requirements. The device is not recommended for bottom-side wave soldering and requires thermal derating above TA = 25 °C per Fig. 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin. |
| VBR min/max | 44.4 V / 49.1 V - Breakdown occurs within this range at 1.0 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | ≤64.5 V - Clamped voltage during 46.5 A 10/1000 μs surge; determines protected IC's maximum stress exposure. |
| PPPM | 3000 W - Peak pulse power handling capability; supports high-energy ESD and load-switching transients. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Polarity | Bidirectional - Symmetric clamping for AC-coupled or floating signal lines without polarity dependency. |
| Package | SMC (DO-214AB) - Standardized 8.0 mm × 8.0 mm copper pad footprint; compatible with automated SMT placement and reflow. |
Pinout & Package
SMC3K40CA-M3/9A uses the standard SMC (DO-214AB) surface-mount package with two terminals: Cathode and Anode. No polarity marking is present on bidirectional variants. The package features matte tin-plated leads, UL 94 V-0 molding compound, and complies with J-STD-002/JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Transient current sink node | Connected to protected line; conducts surge current to ground when voltage exceeds VBR in either polarity. |
| Anode (A) | Transient current source node | Completes bidirectional conduction path; functions identically to cathode under reverse polarity surge conditions. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
| MSL Level 1 | Zero floor life limitation; no baking required prior to reflow, simplifying manufacturing logistics. |
| Halogen-free & RoHS | Meets EU RoHS Directive 2011/65/EU and IEC 61249-2-21; eliminates brominated flame retardants in packaging. |
| Low clamping ratio | VC/VWM ≈ 1.61 - Tight voltage margin between standoff and clamping improves system-level surge margin. |
| Fast response time | <1 ns - Enables suppression of nanosecond-scale ESD events before downstream IC damage occurs. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive switching transients in vehicle ECUs. IC Role / Device Role: Primary bidirectional TVS clamp placed directly at connector entry point before signal conditioning circuitry. Use Value: Withstands 3000 W surges while limiting clamped voltage to ≤64.5 V, preserving integrity of 5 V or 12 V rail-tied receivers. |
Use Scenario: Shielding digital input modules from field-wiring induced transients in factory automation systems exposed to motor contactor noise. IC Role / Device Role: Front-end transient suppressor on 24 V DC input channels, mounted adjacent to terminal block. Use Value: Bidirectional operation accommodates floating or AC-coupled inputs; AEC-Q101 qualification ensures long-term stability in harsh industrial environments. |
| Telecom Line Interface | Consumer Power Adapter Feedback Path |
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE controller sense lines against lightning-induced surges in outdoor telecom equipment. IC Role / Device Role: Secondary-level protector downstream of gas discharge tube (GDT), providing low-clamp refinement. Use Value: 46.5 A IPPM rating and 64.5 V VC enable coordination with upstream GDTs to meet IEC 61000-4-5 Level 4 requirements. |
Use Scenario: Securing optocoupler feedback paths in isolated AC/DC adapters against transformer leakage spikes and mains transients. IC Role / Device Role: Low-capacitance TVS across secondary-side error amplifier inputs to prevent latch-up during startup surges. Use Value: VWM = 40 V aligns with typical 3.3 V/5 V feedback reference rails; bidirectional symmetry avoids polarity design constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K40CAHM3/9A | AEC-Q101 qualified version with identical electrical specs; same SMC package and marking code 3BFR. | Required for new automotive designs where AEC-Q101 compliance is mandatory; differs only in qualification status, not performance. | Select SMC3K40CAHM3/9A when automotive qualification documentation and traceability are contractually required. |
| SMC3K36CA-M3/9A | Lower VWM (36 V) and VBR (40.0–44.2 V); same PPPM (3000 W), VC (58.1 V), and package. | Better suited for 3.3 V or 5 V logic interfaces where tighter clamping margin below 40 V is needed. | Choose SMC3K36CA-M3/9A when protecting lower-voltage circuits where 40 V VWM risks false triggering during normal operation. |
Compared with SMC3K40CA-M3/9A, SMC3K40CAHM3/9A adds formal AEC-Q101 certification without altering electrical behavior, while SMC3K36CA-M3/9A trades higher VWM headroom for improved low-voltage interface safety-enabling precise voltage-margin matching across diverse signal domains.
Availability
SMC3K40CA-M3/9A is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface applications requiring stable component supply, long-lifecycle support, and consistent tape-and-reel delivery in 13" reels (3500 pcs).
Supply support for SMC3K40CA-M3/9A 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 reliability, power efficiency, and automotive-grade validation.
The SMC3KxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in automotive, industrial, and telecom infrastructure where robustness against repetitive surges and long-term parametric stability are critical.
FAQ
What is the maximum clamping voltage of the SMC3K40CA-M3/9A under a 10/1000 μs surge?
The SMC3K40CA-M3/9A has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current of 46.5 A using the standardized 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and represents the upper limit of voltage seen by downstream circuitry during transient events. The SMC3K40CA-M3/9A achieves this clamping performance while maintaining low incremental surge resistance, ensuring effective energy diversion without excessive voltage overshoot.
Is the SMC3K40CA-M3/9A suitable for automotive applications?
Yes, the SMC3K40CA-M3/9A is designed for automotive use and meets AEC-Q101 qualification requirements for temperature cycling, highly accelerated life testing, and ESD immunity. It operates reliably from –55 °C to +150 °C and is commonly deployed in engine control units, body electronics, and ADAS sensor modules. While the base SMC3K40CA-M3/9A variant is qualified, designers requiring full AEC-Q101 documentation traceability should specify the SMC3K40CAHM3/9A variant. The SMC3K40CA-M3/9A remains appropriate for legacy or cost-sensitive automotive designs where qualification evidence is not mandated.
What does the "-M3/9A" suffix indicate in SMC3K40CA-M3/9A?
The "-M3/9A" suffix in SMC3K40CA-M3/9A specifies both material and packaging: "M3" denotes halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance, while "/9A" indicates packaging in 13-inch diameter plastic tape and reel containing 3500 units. This format aligns with Vishay's standardized ordering nomenclature and ensures consistency in procurement, assembly, and traceability. The SMC3K40CA-M3/9A is distinct from HM3-suffixed versions, which carry additional AEC-Q101 qualification but share identical electrical and mechanical characteristics.
Can the SMC3K40CA-M3/9A be used in bidirectional signal lines?
Yes, the SMC3K40CA-M3/9A is exclusively available in bidirectional polarity, making it inherently suitable for AC-coupled, differential, or floating signal paths such as CAN bus lines, audio interfaces, or sensor bridges. Its symmetrical VBR and VC characteristics ensure equal clamping performance regardless of surge polarity. Unlike unidirectional TVS diodes, the SMC3K40CA-M3/9A requires no orientation during placement and provides uniform protection on both sides of the protected node-critical for applications where signal polarity is undefined or variable during operation.
What is the moisture sensitivity level (MSL) rating for SMC3K40CA-M3/9A?
The SMC3K40CA-M3/9A is rated at MSL Level 1 per J-STD-020, meaning it has unlimited floor life and does not require dry-packaging or baking prior to reflow soldering. This simplifies manufacturing logistics and reduces handling overhead in high-volume SMT lines. The device also withstands a maximum peak reflow temperature of 260 °C, supporting lead-free assembly processes. Its MSL Level 1 classification is confirmed in the official Vishay datasheet (Document Number: 89433, Revision: 13-Sep-2022) and applies to all M3-suffixed variants in the SMC3KxxCA family, including the SMC3K40CA-M3/9A.
SMC3K40CA-M3/9A 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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMC3K40CA-M3/9A FAQ
1.How can I place an order for SMC3K40CA-M3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K40CA-M3/9A 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 SMC3K40CA-M3/9A reliable?
The price and inventory of SMC3K40CA-M3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K40CA-M3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K40CA-M3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K40CA-M3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K40CA-M3/9A?
SMC3K40CA-M3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K40CA-M3/9A 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 SMC3K40CA-M3/9A?
For technical support, including SMC3K40CA-M3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K40CA-M3/9A requirements.
6.How does Aetrix verify that SMC3K40CA-M3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K40CA-M3/9A 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 SMC3K40CA-M3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K40CA-M3/9A?
All SMC3K40CA-M3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K40CA-M3/9A, 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 SMC3K40CA-M3/9A part is unused and in its original packaging.
Return procedure for SMC3K40CA-M3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K40CA-M3/9A 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 …
