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Vishay General Semiconductor - Diodes Division SMCJ40A-M3/9AT
- Part No.:
- SMCJ40A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40A-M3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,083
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Product details
Overview
SMCJ40A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, featuring 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V clamping voltage (VC) at 23.3 A peak pulse current, and 1500 W peak pulse power rating for 10/1000 µs waveform - deployed for robust overvoltage protection of DC power rails and signal lines in automotive and industrial control modules.
For engineers reviewing the SMCJ40A-M3/9AT datasheet, SMCJ40A-M3/9AT pinout, SMCJ40A-M3/9AT application, or SMCJ40A-M3/9AT equivalent, this part delivers verified AEC-Q101-qualified surge immunity with halogen-free RoHS compliance, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and load-switching transient suppression in production-grade designs.
Technical Context
The SMCJ40A-M3/9AT operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (44.4–49.1 V at 1 mA test current), clamping transients to ≤64.5 V within nanoseconds. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Designed for surface-mount assembly on standard PCB copper pads (8.0 mm × 8.0 mm per terminal), it sustains 200 A non-repetitive forward surge current (8.3 ms half-sine) and maintains thermal stability up to 150 °C junction temperature, with RθJA = 75 °C/W and RθJL = 15 °C/W enabling effective heat dissipation without heatsinking in typical layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V nominal systems. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed avalanche onset range; ensures predictable triggering across process variation and temperature. |
| VC @ IPPM | 64.5 V at 23.3 A - Clamped voltage during full 1500 W transient; limits downstream IC stress below 65 V absolute maximum ratings. |
| PPPM | 1500 W - Peak pulse power handling for 10/1000 µs waveform; meets ISO 7637-2 Pulse 1 & 2a severity levels. |
| IFSM | 200 A - Single half-sine surge current capability (8.3 ms); supports protection against inductive kickback in relay/motor drivers. |
| TJ max | 150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SMCJ40A-M3/9AT uses the SMC (DO-214AB) package: a rectangular surface-mount case with two coplanar matte tin-plated leads, cathode identified by a band on the body. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated power derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased anode connection point | Connected to protected line (e.g., +12 V rail); conducts during overvoltage to shunt current to ground. |
| Anode | Reference/ground return path | Connected to system ground or low-impedance return; completes clamping loop with minimal inductance for fast response. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | M3 suffix confirms full halogen-free material set meeting JEDEC J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance. |
| AEC-Q101 qualification option | Available in HM3 variant (e.g., SMCJ40AHM3_X); validated for automotive electronics per stress test requirements including HTGB, TCT, and HTRB. |
| Low incremental surge resistance | Enables tighter VC/VBR ratio (≤1.45×) and lower let-through energy during fast transients like EFT or ESD. |
| Very fast response time | Sub-nanosecond avalanche turn-on ensures clamping before sensitive logic or analog circuitry experiences overstress. |
| Glass passivated chip junction | Provides stable leakage performance (<1 µA at VWM) and long-term reliability under thermal cycling and humidity exposure. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-connected ECUs from load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground, acting as primary overvoltage clamp ahead of DC/DC converters and microcontrollers. Use Value: Limits peak voltage to ≤64.5 V during 1500 W surges, preventing latch-up or gate oxide damage in downstream PMICs and CAN transceivers. | Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors exposed to cable-induced surges in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector entry point, shunting induced transients before signal conditioning op-amps and ADCs. Use Value: Clamps 1 kV ESD events (IEC 61000-4-2) and 400 V ring wave surges (IEC 61000-4-12) while maintaining <1 µA leakage at 40 V standby. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Securing 48 V PoE-powered network switches against lightning-induced surges on Ethernet data lines and auxiliary power feeds. IC Role / Device Role / Timing Role: Standoff-rated TVS on secondary-side 48 V input, coordinated with upstream GDTs and series impedance for multi-stage protection. Use Value: Withstands repeated 10/1000 µs surges up to 1500 W without degradation, ensuring >10-year field life in outdoor telecom cabinets. | Use Scenario: Adding robust surge immunity to USB-C power delivery circuits in portable monitors and docking stations. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line, placed after fuse and before buck converter, absorbing hot-plug and short-circuit transients. Use Value: Maintains 40 V working voltage margin above 20 V PD 3.1 PPS max, clamping faults to safe levels before silicon controller shutdown thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-M3/8A | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher VC/IPPM ratio (64.5 V @ 6.2 A) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 or load dump scenarios | Select when space-constrained and surge threat level is limited to IEC 61000-4-5 Level 3 (0.5 kV/0.25 kA) |
| SMCJ40CA-M3/9AT | Bidirectional variant; identical VWM, VBR, VC, and PPPM but symmetric clamping in both polarities | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD differential pairs) where polarity reversal occurs | Choose only when protecting bidirectional interfaces; not interchangeable with SMCJ40A-M3/9AT due to polarity mismatch |
Compared with SMAJ40A-M3/8A and SMCJ40CA-M3/9AT, the SMCJ40A-M3/9AT uniquely balances 1500 W surge capacity, unidirectional polarity, and SMC package thermal performance - making it the preferred choice for high-energy DC rail protection where layout area and thermal management are constrained but reliability is mission-critical.
Availability
SMCJ40A-M3/9AT is available at Aetrix Electronics and suitable for automotive control units, industrial sensor nodes, telecom power supplies, and consumer USB-C PD systems requiring stable component supply with halogen-free, AEC-Q101-ready sourcing options.
Supply support for SMCJ40A-M3/9AT 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 high-reliability, automotive-qualified, and industry-standard solutions.
The SMCJ series is engineered for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against load dump, EFT, and lightning-induced surges is mandatory.
FAQ
What is the clamping voltage of the SMCJ40A-M3/9AT under maximum rated surge current?
The SMCJ40A-M3/9AT clamps to a maximum of 64.5 V when subjected to its rated peak pulse current of 23.3 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 standards and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88394. The clamping performance ensures downstream components remain within safe operating voltage limits during high-energy transients.
Is the SMCJ40A-M3/9AT qualified for automotive applications?
The base SMCJ40A-M3/9AT is halogen-free and RoHS-compliant but not AEC-Q101 qualified. However, Vishay offers the SMCJ40AHM3_X variant (with "_X" denoting revision code) which carries full AEC-Q101 qualification for automotive use. Engineers requiring automotive grade must specify the HM3 suffix and revision code - the SMCJ40A-M3/9AT itself is intended for commercial and industrial applications with automotive-compatible reliability margins.
What does the "M3" suffix mean in SMCJ40A-M3/9AT?
The "M3" suffix in SMCJ40A-M3/9AT indicates halogen-free, RoHS-compliant construction meeting JEDEC J-STD-020 moisture sensitivity Level 1 and JESD201 Class 2 whisker resistance requirements. It distinguishes the part from the "E3" (RoHS-compliant, non-halogen-free) and "HM3" (halogen-free + AEC-Q101 qualified) variants. This designation is critical for compliance-driven programs in Europe and Asia.
Can the SMCJ40A-M3/9AT be used in bidirectional signal protection?
No - the SMCJ40A-M3/9AT is strictly unidirectional, with cathode marked by a band and designed to clamp only reverse-polarity transients. For bidirectional protection (e.g., RS-485, CAN, or AC-coupled lines), the SMCJ40CA-M3/9AT must be used instead. Using SMCJ40A-M3/9AT in bidirectional configurations risks forward conduction and failure during positive-going surges.
What is the thermal resistance of the SMCJ40A-M3/9AT in standard mounting conditions?
The SMCJ40A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. These values assume no external heatsinking and define safe power derating above 25 °C ambient - for example, at 70 °C ambient, maximum continuous power drops to ~3.3 W per Vishay's derating curve (Fig. 2).
SMCJ40A-M3/9AT 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 23.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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 (SMC)
SMCJ40A-M3/9AT FAQ
1.How can I place an order for SMCJ40A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40A-M3/9AT 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 SMCJ40A-M3/9AT reliable?
The price and inventory of SMCJ40A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ40A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40A-M3/9AT?
SMCJ40A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40A-M3/9AT 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 SMCJ40A-M3/9AT?
For technical support, including SMCJ40A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ40A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ40A-M3/9AT 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 SMCJ40A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ40A-M3/9AT?
All SMCJ40A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40A-M3/9AT, 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 SMCJ40A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ40A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40A-M3/9AT Tags
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