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Vishay General Semiconductor - Diodes Division SMCJ40A-M3/57T
- Part No.:
- SMCJ40A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40A-M3/57T.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,694
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Product details
Overview
SMCJ40A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 64.5 V maximum clamping voltage (VC) at 23.3 A peak pulse current (IPPM), and 1500 W peak pulse power rating (10/1000 µs waveform).
For engineers reviewing the SMCJ40A-M3/57T datasheet, SMCJ40A-M3/57T pinout, SMCJ40A-M3/57T application, or SMCJ40A-M3/57T equivalent, key selection criteria include clamping performance under 23.3 A surge, thermal resistance (RθJA = 75 °C/W), halogen-free RoHS compliance (M3 suffix), and suitability for automotive-grade designs when paired with AEC-Q101 qualified variants.
Technical Context
The SMCJ40A-M3/57T operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown threshold to clamp transient energy into ground. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling fast response (<1 ns) to ESD and lightning-induced surges per IEC 61000-4-2/4-5.
Designed for PCB-level protection of sensitive inputs-such as microcontroller I/O, sensor supply lines, and MOSFET gate drivers-it leverages the SMC package's low thermal resistance (RθJL = 15 °C/W) and MSL Level 1 moisture sensitivity rating for reliable reflow soldering without popcorn cracking.
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 systems. |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - Tight breakdown window ensures predictable turn-on across temperature and unit-to-unit variation. |
| VC @ IPPM | 64.5 V at 23.3 A - Clamping voltage during 10/1000 µs surge; limits downstream IC stress to sub-65 V during worst-case transients. |
| PPPM | 1500 W - Peak pulse power handling capacity; supports high-energy surges common in industrial motor drives and automotive load-dump events. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and enclosed industrial enclosures. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient on standard 8 mm × 8 mm copper pads; informs heatsinking requirements for sustained power dissipation. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when reverse voltage exceeds VBR. |
| Anode | Reference/ground return | Typically tied to system ground plane; completes clamping path and establishes reference for VWM/VBR specification. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables automated placement and high-density PCB layouts while maintaining 1500 W surge capability in < 7 mm × 6 mm footprint. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage (ID ≤ 1.0 µA at VWM), critical for battery-powered and low-power sensor nodes. |
| MSL Level 1 rating | Permits unlimited floor life and single-reflow processing at 260 °C peak, eliminating bake-out requirements in high-volume manufacturing. |
| Halogen-free construction (M3) | Meets IPC-4101D/21 and JEDEC J-STD-020 standards for environmentally constrained applications including automotive and medical electronics. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-supplied ECUs against ISO 7637-2 load-dump transients up to 60 V and 100 ms duration. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp overshoot before it reaches LDOs or microcontrollers. Use Value: Limits peak voltage to 64.5 V during 23.3 A surge, preventing latch-up or permanent damage to downstream 5 V/3.3 V logic. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input modules exposed to field wiring transients. IC Role / Device Role / Timing Role: TVS mounted directly at sensor connector to shunt induced surges before they couple into precision op-amp front-ends. Use Value: Sub-1 ns response and 1.0 µA leakage at 40 V preserve signal integrity and offset accuracy in 24-bit ADC systems. |
| DC Motor Drive Gate Protection | Telecom Power Supply Input Protection |
Use Scenario: Shielding N-channel MOSFET gate drivers in H-bridge motor controllers from inductive kickback during PWM switching. IC Role / Device Role / Timing Role: TVS placed between gate and source to clamp negative-going spikes that could exceed gate oxide breakdown voltage. Use Value: 64.5 V clamping ensures gate-source voltage stays within ±20 V absolute maximum rating of common logic-level MOSFETs. | Use Scenario: Front-end protection of 48 V telecom rectifier modules subjected to lightning-induced surges per IEC 61000-4-5 (10/700 µs, 4 kV). IC Role / Device Role / Timing Role: Primary TVS on DC input bus to absorb bulk surge energy before secondary filtering and regulation stages. Use Value: 1500 W PPPM rating handles full 4 kV/12 Ω test energy (≈ 1333 W), providing margin for repeated surge events in outdoor base stations. |
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-M3/57T | Lower PPPM (400 W), smaller SMA package, same VWM/VBR/VC specs. | Not suitable for 1500 W surge events; limited to low-energy ESD or board-level coupling. | Select only if surge threat level is ≤ 400 W and space constraints prohibit SMC footprint. |
| SMCJ40CA-M3/57T | Bidirectional variant; identical VWM/VBR/VC but symmetric conduction in both polarities. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus); not usable on unidirectional DC rails without redesign. | Choose when protecting balanced differential interfaces where reverse polarity transients must also be clamped. |
Compared with SMAJ40A-M3/57T and SMCJ40CA-M3/57T, the SMCJ40A-M3/57T uniquely delivers 1500 W surge immunity in a unidirectional configuration compatible with standard DC power architectures-making it optimal for 48 V automotive and industrial power rail protection where high-energy, polarity-specific clamping is required.
Availability
SMCJ40A-M3/57T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC analog inputs, DC motor drive gate circuits, and telecom rectifier modules requiring stable component supply with halogen-free compliance and MSL Level 1 manufacturability.
Supply support for SMCJ40A-M3/57T 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 qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments-including automotive, industrial automation, and telecommunications infrastructure-where consistent clamping performance and long-term stability are non-negotiable.
FAQ
What is the maximum clamping voltage of the SMCJ40A-M3/57T under a 10/1000 µs surge?
The SMCJ40A-M3/57T has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current of 23.3 A using the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components see no more than 64.5 V during such a transient event, making the SMCJ40A-M3/57T suitable for protecting 48 V systems with adequate safety margin.
Is the SMCJ40A-M3/57T RoHS-compliant and halogen-free?
Yes, the SMCJ40A-M3/57T carries the M3 suffix, indicating full RoHS compliance and halogen-free construction per IPC-4101D/21 and JEDEC J-STD-020. The molding compound meets UL 94 V-0 flammability rating, and the matte tin-plated leads are solderable per J-STD-002 and JESD 22-B102, confirming its suitability for environmentally regulated applications including automotive and medical electronics.
Does the SMCJ40A-M3/57T have AEC-Q101 qualification?
No, the SMCJ40A-M3/57T is a commercial-grade device. For AEC-Q101 qualified versions, engineers must select the HM3-suffixed variants such as SMCJ40A-HM3/57T, which include additional stress testing for automotive under-hood use. The base SMCJ40A-M3/57T meets all electrical and mechanical specifications in the datasheet but lacks the extended qualification testing required for automotive safety-critical applications.
What is the thermal resistance of the SMCJ40A-M3/57T, and how does it affect layout?
The SMCJ40A-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's datasheet Figure 6; reducing pad area increases RθJA and risks thermal runaway during repetitive surges. Layouts must maintain these pad dimensions and ensure solid thermal vias to internal ground planes for sustained reliability.
How does the SMCJ40A-M3/57T differ from the bidirectional SMCJ40CA-M3/57T?
The SMCJ40A-M3/57T is unidirectional, with polarity marked by a cathode band and intended for DC line protection where current flows in one direction only. In contrast, the SMCJ40CA-M3/57T is bidirectional-lacking polarity marking-and clamps transients of either polarity, making it appropriate for AC signals or differential buses like RS-485. Their VWM, VBR, and VC values are identical, but substitution requires circuit-level validation of polarity requirements and grounding topology.
SMCJ40A-M3/57T 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-M3/57T FAQ
1.How can I place an order for SMCJ40A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40A-M3/57T 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-M3/57T reliable?
The price and inventory of SMCJ40A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ40A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40A-M3/57T?
SMCJ40A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40A-M3/57T 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-M3/57T?
For technical support, including SMCJ40A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40A-M3/57T requirements.
6.How does Aetrix verify that SMCJ40A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ40A-M3/57T 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-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ40A-M3/57T?
All SMCJ40A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40A-M3/57T, 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-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ40A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40A-M3/57T Tags
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