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Vishay General Semiconductor - Diodes Division SMBJ40CA-E3/52
- Part No.:
- SMBJ40CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CA-E3/52.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:21,993
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Product details
Overview
SMBJ40CA-E3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 9.3 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), commonly deployed to protect MOSFETs, sensor interfaces, and industrial I/O circuits against ESD and inductive switching surges.
For engineers reviewing the SMBJ40CA-E3/52 datasheet, SMBJ40CA-E3/52 pinout, SMBJ40CA-E3/52 application, or SMBJ40CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.61), MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped surge protector with symmetrical breakdown behavior in both polarities due to its bidirectional construction. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns), while the 100 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design per Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) layout for rated power dissipation.
The SMBJ40CA-E3/52 complies with ANSI/IEEE C62.35 standards for transient suppressors and meets UL 497B recognition (QVGQ2). It delivers 600 W peak pulse power under repetitive 0.01% duty cycle conditions and maintains ≤1.0 µA reverse leakage at VWM, enabling reliable protection in low-power sensor and communication line applications without loading effects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 36–40 V DC rails. |
| VBR min / max | 44.4 V / 49.1 V at 1 mA - Verified breakdown range ensures consistent clamping onset across production lots. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamping voltage during 10/1000 µs surge; limits downstream IC stress to <65 V under worst-case 600 W transient. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; supports robust protection against lightning-induced and inductive-switching transients. |
| IPPM | 9.3 A - Peak surge current capacity derived from PPPM/VC; enables coordination with upstream fuses or PTCs. |
| TJ max | +150 °C - Maximum junction temperature rating allows operation in industrial environments up to 85 °C ambient with proper derating. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with J-STD-020 MSL Level 1 reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; polarity-unmarked for bidirectional operation; no cathode/anode designation required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | Either end connects to protected line; no polarity sensitivity-enables placement flexibility on differential or AC-coupled paths. |
| Case (body) | Non-electrical mechanical interface | No internal connection; serves only as thermal path and mechanical anchor; requires minimum 5.0 mm × 5.0 mm copper pad per terminal for rated power handling. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24–48 V systems without cascaded stages. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to downstream ICs-critical for 3.3 V or 5 V logic interfacing via level-shifted or isolated signal paths. |
| MSL Level 1, 260 °C peak reflow | Supports lead-free reflow without baking or special handling; eliminates moisture-related popcorning risk in high-volume SMT lines. |
| Glass-passivated junction | Ensures stable breakdown voltage over temperature and lifetime; reduces parameter drift versus epoxy-passivated alternatives. |
| UL 497B recognized (QVGQ2) | Validates compliance for telecom and industrial equipment safety certification-reduces test burden for end-product approvals. |
Applications
| Industrial Motor Control I/O Protection | Automotive Body Control Module (BCM) Sensor Inputs |
|---|---|
|
Use Scenario: Protecting 24 V CAN/LIN bus sensor inputs (e.g., temperature, pressure) from load dump and inductive kickback in factory automation panels. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching signal conditioning op-amps or microcontroller GPIOs. Use Value: Limits transient voltage to ≤64.5 V during 9.3 A surges, preventing latch-up or gate oxide damage in downstream 3.3 V or 5 V interface ICs. |
Use Scenario: Safeguarding analog sensor signal lines (e.g., HVAC actuators, door position switches) in 12 V automotive BCMs exposed to ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary TVS element mounted adjacent to connector pins to absorb energy from coupled transients before entering signal filtering networks. Use Value: Withstands repetitive 600 W surges at 0.01% duty cycle-supports long-term reliability in vehicles with frequent accessory switching events. |
| Telecom Power Supply Input Stage | Consumer Appliance Smart Inverter Gate Drive Protection |
|
Use Scenario: Clamping input transients on 48 V PoE-powered telecom equipment front-end rectifiers and DC-DC converters. IC Role / Device Role / Timing Role: Secondary-level surge suppressor placed after primary MOVs to handle residual fast-rising edges (tr < 1 ns) that bypass slower components. Use Value: Sub-1 ns response time captures high-dV/dt spikes missed by bulkier protectors-preserves regulation integrity of downstream PMICs. |
Use Scenario: Shielding half-bridge gate drivers (e.g., IR2104) in smart washing machine inverters from shoot-through-induced voltage spikes during MOSFET switching. IC Role / Device Role / Timing Role: Localized TVS across gate-source terminals or bootstrap supply rails to clamp Miller-induced overshoot and ringing. Use Value: 40 V VWM aligns with typical 35–42 V bootstrap rail voltages, ensuring no false triggering during normal PWM operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package; same thermal and clamping performance. | No functional difference-selected when halogen-free material compliance is mandated by OEM environmental policy (e.g., IPC-1752). | Choose SMBJ40CA-M3/52 if halogen-free bill-of-materials is required; otherwise, SMBJ40CA-E3/52 offers standard commercial-grade compliance. |
| SMCJ40CA-E3/52 | Same VWM, VBR, and VC, but in larger SMC (DO-214AB) package with 1500 W PPPM rating and higher IPPM (15.2 A). | Used where higher surge margin is needed (e.g., outdoor telecom enclosures), but requires larger PCB area and different pad layout. | Select SMBJ40CA-E3/52 for space-constrained designs needing 600 W protection; choose SMCJ40CA-E3/52 only when >1 kA surge immunity or extended lifetime under repeated stress is verified. |
Compared with SMBJ40CA-M3/52, the SMBJ40CA-E3/52 differs only in halogen content-not performance-making it suitable for general industrial use; versus SMCJ40CA-E3/52, it trades 40% lower surge rating for 35% smaller footprint, optimizing board space where 600 W meets system-level surge test requirements.
Availability
SMBJ40CA-E3/52 is available at Aetrix Electronics and suitable for industrial motor control I/O protection, automotive BCM sensor inputs, and telecom power supply input stage applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ40CA-E3/52 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, precision, and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in space-constrained, high-reliability applications-including industrial automation, automotive subsystems, and telecom infrastructure-where consistent clamping and AEC-Q101 readiness matter.
FAQ
What is the clamping voltage of SMBJ40CA-E3/52 at its rated peak pulse current?
The SMBJ40CA-E3/52 has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The clamping performance ensures downstream circuitry remains within safe voltage limits during transient events, making SMBJ40CA-E3/52 suitable for protecting 3.3 V, 5 V, and 24 V interface ICs.
Is SMBJ40CA-E3/52 suitable for automotive applications?
SMBJ40CA-E3/52 is not AEC-Q101 qualified; it is a commercial-grade part. For automotive use, Vishay offers the SMBJ40CAHE3 variant (with HE3 suffix), which carries AEC-Q101 qualification. Engineers must select SMBJ40CAHE3-or confirm system-level validation-if deploying SMBJ40CA-E3/52 in automotive environments. The SMBJ40CA-E3/52 itself meets UL 497B and operates from –55 °C to +150 °C, but lacks the stress-test documentation required for automotive qualification.
What does the "CA" suffix indicate in SMBJ40CA-E3/52?
The "CA" suffix in SMBJ40CA-E3/52 denotes a bidirectional configuration-meaning the device provides symmetrical transient suppression in both forward and reverse directions. Unlike unidirectional variants (e.g., SMBJ40A), SMBJ40CA-E3/52 has no polarity marking and can be used on AC lines, differential signals, or any path where voltage reversals occur. This makes SMBJ40CA-E3/52 ideal for protecting RS-485 buses, transformer-coupled interfaces, and dual-rail power domains.
How does SMBJ40CA-E3/52 compare to SMAJ40CA in terms of power handling?
SMBJ40CA-E3/52 delivers 600 W peak pulse power (10/1000 µs), whereas SMAJ40CA is rated for 400 W under the same waveform. The SMB package of SMBJ40CA-E3/52 provides ~25% higher surge capacity than the smaller SMA (DO-214AC) package of SMAJ40CA due to improved thermal mass and leadframe design. This makes SMBJ40CA-E3/52 preferable for applications demanding higher transient immunity without increasing footprint beyond standard SMB land patterns.
What is the maximum reverse leakage current for SMBJ40CA-E3/52 at its stand-off voltage?
The SMBJ40CA-E3/52 exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 40 V stand-off voltage (VWM) and 25 °C ambient temperature. This low leakage ensures minimal power loss and signal distortion in high-impedance sensor or communication circuits. Leakage remains below 5 µA up to 85 °C ambient, supporting stable operation in industrial environments without compromising battery life or measurement accuracy.
SMBJ40CA-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 9.3A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ40CA-E3/52 FAQ
1.How can I place an order for SMBJ40CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CA-E3/52 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 SMBJ40CA-E3/52 reliable?
The price and inventory of SMBJ40CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ40CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CA-E3/52?
SMBJ40CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CA-E3/52 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 SMBJ40CA-E3/52?
For technical support, including SMBJ40CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ40CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ40CA-E3/52 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 SMBJ40CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ40CA-E3/52?
All SMBJ40CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CA-E3/52, 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 SMBJ40CA-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ40CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CA-E3/52 Tags
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