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Vishay General Semiconductor - Diodes Division SMCJ40A-E3/9AT
- Part No.:
- SMCJ40A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40A-E3/9AT.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,980
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Product details
Overview
SMCJ40A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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 dissipation (PPPM) with 10/1000 μs waveform.
For engineers reviewing the SMCJ40A-E3/9AT datasheet, SMCJ40A-E3/9AT pinout, SMCJ40A-E3/9AT application, or SMCJ40A-E3/9AT equivalent, this device is selected for robust overvoltage protection on DC power rails, MOSFET gate drivers, and sensor signal lines where fast response (<1 ns), low clamping ratio (VC/VBR ≈ 1.37), and AEC-Q101 qualification readiness are critical design requirements.
Technical Context
The SMCJ40A-E3/9AT operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transient events. Its clamping behavior is defined by a 10/1000 μs surge waveform, and thermal performance is characterized by RθJA = 75 °C/W and RθJL = 15 °C/W.
It supports automated SMT placement, meets J-STD-020 MSL Level 1 (peak reflow 260 °C), and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. Polarity is marked by a cathode band; no marking is used for bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal DC rail operation. |
| VBR min/max | 44.4 V / 49.1 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM for noise immunity. |
| VC @ IPPM | 64.5 V at 23.3 A - Clamping voltage under 1500 W surge defines worst-case protected circuit stress during transient. |
| PPPM | 1500 W - Peak pulse power rating with 10/1000 μs waveform; determines energy-handling capability for common surge standards. |
| ID @ VWM | 1.0 μA - Reverse leakage at stand-off voltage; low value minimizes standby power loss in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and industrial environments. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal requirement. |
Pinout & Package
Package: SMC (DO-214AB), 2-terminal surface-mount case with cathode band marking. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); recommended pad layout: 8.0 mm × 8.0 mm copper per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential point in protected circuit; forms return path during clamping. |
| Cathode | High-side transient sink | Connected to protected line (e.g., +40 V rail); conducts surge current to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping ratio VC/VBR | 1.37 - Low ratio ensures minimal overvoltage exposure to downstream ICs during surge events. |
| Response time | < 1 ns - Enables protection of high-speed interfaces and fast-switching power stages against ESD and EFT. |
| Surge robustness | 1500 W PPPM - Supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) compliance when properly laid out with 8 mm² pads. |
| Process reliability | Glass-passivated junction - Improves long-term stability and reduces parameter drift under thermal cycling and humidity. |
| Manufacturing compatibility | MSL Level 1, 260 °C peak reflow - Eliminates moisture sensitivity concerns and supports standard lead-free SMT assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs and body control modules from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp transients up to 1500 W without forward conduction. Use Value: Limits voltage excursion to ≤64.5 V during 100 ms load dump events, preserving MCU and CAN transceiver integrity. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA, 0–5 V) of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Standoff-mode protector on signal path, leveraging 1.0 μA leakage to avoid measurement error in high-impedance circuits. Use Value: Prevents latch-up or damage from 4 kV ESD (IEC 61000-4-2) while maintaining signal fidelity due to low capacitance (~100 pF at 0 V). |
| DC-DC Converter Input Protection | MOSFET Gate Driver Protection |
|
Use Scenario: Safeguarding buck converter inputs against back-EMF from relay coils and motor drives in HVAC and power supplies. IC Role / Device Role / Timing Role: Primary surge shunt on VIN rail upstream of input capacitor, sized for 23.3 A IPPM with 10/1000 μs profile. Use Value: Absorbs inductive kick energy without degrading efficiency-no series impedance or forward voltage drop in steady state. |
Use Scenario: Securing high-side N-channel MOSFET gate drive signals in half-bridge motor controllers exposed to shoot-through transients. IC Role / Device Role / Timing Role: Low-capacitance clamping device tied between gate and source, activated only during >44.4 V excursions. Use Value: Prevents gate oxide rupture by limiting VGS to ≤64.5 V while adding <0.5 pF parasitic capacitance at signal frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/61T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W) | Suitable for lower-energy surges or space-constrained PCBs where thermal margin is less critical | Select when board area is limited and surge threat level is ≤IEC 61000-4-5 Level 2 (1 kV/2 Ω) |
| SMCJ40CA-E3/9AT | Bidirectional variant; same VWM (40 V), symmetric clamping in both polarities; ID doubled to 2.0 μA | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, audio) | Choose only when bidirectional protection is mandated; not a drop-in replacement due to polarity symmetry and leakage difference |
Compared with SMCJ40A-E3/9AT, SMAJ40A-E3/61T trades surge capacity for size, while SMCJ40CA-E3/9AT adds bidirectional capability at the cost of higher leakage-neither offers pin-to-pin compatibility, and layout revision is required for either alternative.
Availability
SMCJ40A-E3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, DC-DC converter input safeguarding, and MOSFET gate driver surge suppression requiring stable component supply across production lifecycles.
Supply support for SMCJ40A-E3/9AT 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 reliability, thermal performance, and automotive-grade qualification.
The SMCJ series was developed specifically for high-energy transient suppression in harsh environments-including under-hood automotive, industrial controls, and telecom infrastructure-where 1500 W surge handling and AEC-Q101 readiness are mandatory.
FAQ
What is the maximum clamping voltage of the SMCJ40A-E3/9AT under rated surge conditions?
The SMCJ40A-E3/9AT has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current of 23.3 A using a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on the protected circuit during transient events. The SMCJ40A-E3/9AT maintains this clamping performance across its specified operating temperature range of –55 °C to +150 °C.
Is the SMCJ40A-E3/9AT RoHS-compliant and halogen-free?
Yes, the SMCJ40A-E3/9AT carries the "E3" suffix, indicating it is RoHS-compliant and qualified to commercial grade standards per Vishay's material categorization (www.vishay.com/doc?99912). It is not halogen-free; for halogen-free compliance, the "M3" suffix variant (e.g., SMCJ40A-M3/9AT) must be selected. Both E3 and M3 versions meet JESD 201 Class 2 whisker resistance requirements.
Can the SMCJ40A-E3/9AT be used in automotive applications requiring AEC-Q101 qualification?
The base SMCJ40A-E3/9AT is not AEC-Q101 qualified. However, Vishay offers AEC-Q101 variants under the "HE3" suffix (e.g., SMCJ40AHE3_A/I), which share identical electrical characteristics and SMC package but include extended reliability testing per AEC-Q101. For automotive designs requiring formal qualification, the SMCJ40AHE3_A/I-not the SMCJ40A-E3/9AT-must be specified and sourced.
What is the thermal resistance from junction to ambient for the SMCJ40A-E3/9AT?
The typical thermal resistance from junction to ambient (RθJA) for the SMCJ40A-E3/9AT is 75 °C/W, measured on a standard PCB with 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes no additional heatsinking and is critical for calculating maximum power dissipation at elevated ambient temperatures. Derating follows Figure 2 in the datasheet (Document Number: 88394), where usable power drops linearly above TA = 25 °C.
How does the SMCJ40A-E3/9AT differ from the SMCJ40CA-E3/9AT?
The SMCJ40A-E3/9AT is unidirectional with cathode-band polarity marking and 1.0 μA maximum reverse leakage at 40 V, while the SMCJ40CA-E3/9AT is bidirectional-lacking polarity marking-with doubled leakage (2.0 μA) for VWM ≤ 10 V devices (per note 3 in datasheet). Their clamping voltages and surge ratings are identical, but the SMCJ40CA-E3/9AT conducts in both directions, making it unsuitable as a direct replacement in DC-coupled unidirectional applications without circuit review.
SMCJ40A-E3/9AT 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 (SMCJ)
SMCJ40A-E3/9AT FAQ
1.How can I place an order for SMCJ40A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40A-E3/9AT 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-E3/9AT reliable?
The price and inventory of SMCJ40A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ40A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40A-E3/9AT?
SMCJ40A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40A-E3/9AT 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-E3/9AT?
For technical support, including SMCJ40A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ40A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ40A-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ40A-E3/9AT?
All SMCJ40A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40A-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ40A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40A-E3/9AT Tags
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