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Vishay General Semiconductor - Diodes Division SMBJ40A-E3/52
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- Part No.:
- SMBJ40A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40A-E3/52.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:139,250
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Product details
Overview
SMBJ40A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode 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 range at 1 mA, clamps transients to ≤64.5 V at 9.3 A peak pulse current (10/1000 µs), and delivers 600 W peak pulse power - used in industrial motor drives, automotive body control modules, and PoE-powered Ethernet interfaces.
For engineers reviewing the SMBJ40A-E3/52 datasheet, SMBJ40A-E3/52 pinout, SMBJ40A-E3/52 application, or SMBJ40A-E3/52 equivalent, key selection criteria include its unidirectional polarity, SMB (DO-214AA) package compatibility with automated SMT assembly, low clamping ratio (VC/VBR ≈ 1.38), and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, entering avalanche conduction when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage performance (<1.0 µA at 40 V), while low incremental surge resistance enables rapid energy dissipation during ESD or lightning-induced surges.
The SMBJ40A-E3/52 is rated for -55 °C to +150 °C junction temperature, exhibits a positive temperature coefficient of breakdown voltage (+0.101 %/°C), and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow peak - confirming suitability for high-reliability commercial and automotive-grade PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin. |
| VBR (Breakdown Voltage) | 44.4–49.1 V at 1 mA - guaranteed avalanche initiation range; sets precise overvoltage trip point. |
| VC (Clamping Voltage) | ≤64.5 V at IPPM = 9.3 A (10/1000 µs) - peak voltage seen by protected IC during surge; determines system-level immunity. |
| PPPM (Peak Pulse Power) | 600 W - maximum transient energy absorption capability under standardized waveform; validates surge robustness. |
| ID (Reverse Leakage) | ≤1.0 µA at 40 V - minimal standby power loss and noise coupling; critical for low-power sensor interfaces. |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMD outline (5.21 × 4.06 × 2.20 mm); supports high-density layout and automated placement. |
| Polarity | Unidirectional - cathode marked by band; blocks forward current beyond VF ≈ 3.5 V at 50 A, enabling DC rail protection only. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, 2-terminal device with matte tin-plated leads solderable per J-STD-002. Cathode identified by molded band on case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during reverse surge. |
| Cathode | Protected line connection | Connected to input rail or signal line; conducts avalanche current to anode when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 (4 kV surge) compliance without derating on standard PCB copper pads. |
| Clamping ratio VC/VBR ≈ 1.38 | Minimizes overvoltage stress on downstream MOSFETs or microcontrollers during fast transients. |
| Glass-passivated junction | Ensures long-term stability of VBR and ID across thermal cycling and humidity exposure. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture sensitivity concerns or baking requirements. |
| RoHS-compliant, halogen-free option available | Meets IPC-1752A material declaration requirements for global electronics manufacturing. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and MCU I/O against inductive kickback from 24 V solenoid coils and relay loads. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply rail and ground, clamping spikes within 1 ns. Use Value: Prevents latch-up or permanent damage to 3.3 V logic interfaces by limiting transient voltage to ≤64.5 V. |
Use Scenario: Safeguarding LIN bus transceivers and door module sensors from load dump and jump-start events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V power input, absorbing 600 W surges without degradation. Use Value: Maintains functional safety integrity per ISO 7637-2 Pulse 5a while supporting AEC-Q101-qualified designs. |
| Power over Ethernet (PoE) PSE | Industrial PLC Analog Input Modules |
|
Use Scenario: Secondary overvoltage protection on 48–57 V DC power pairs upstream of IEEE 802.3af/at PD controllers. IC Role / Device Role / Timing Role: Fast-clamping TVS in parallel with primary DC-DC converter input, triggered by cable ESD events. Use Value: Limits voltage overshoot to <65 V, preserving isolation barrier integrity and preventing controller reset. |
Use Scenario: Protecting 4–20 mA current loop receivers and ADC front-ends from field wiring transients in factory automation. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS on signal input, placed before precision op-amp buffer stage. Use Value: Avoids measurement offset drift or saturation caused by sub-µA leakage at 24 V common-mode voltage. |
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-E3/52 | Bidirectional variant; symmetric VBR (44.4–49.1 V) in both polarities; no polarity marking. | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN FD); not suitable for DC rail protection. | Select only if protecting bidirectional signals; otherwise, unidirectional SMBJ40A-E3/52 offers lower cost and simpler layout. |
| SAC40A-TB-E3/52 | Same VWM (40 V) but higher PPPM (1500 W); larger SMA package (DO-214AC); VF = 4.5 V max at 50 A. | Used where higher surge margin is needed (e.g., outdoor telecom equipment); requires larger PCB footprint. | Choose SAC40A-TB-E3/52 only when 600 W is insufficient; SMBJ40A-E3/52 remains optimal for space-constrained 24/48 V industrial boards. |
Compared with SMBJ40CA-E3/52 and SAC40A-TB-E3/52, the SMBJ40A-E3/52 provides the best balance of compact SMB packaging, precise 40 V standoff, and verified 600 W surge handling - making it the preferred choice for cost-sensitive, high-volume DC power rail protection where polarity is fixed and board area is constrained.
Availability
SMBJ40A-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and Power over Ethernet (PoE) systems requiring stable component supply, consistent RoHS compliance, and traceable lot-level documentation.
Supply support for SMBJ40A-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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMBJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting industrial automation, transportation, and communications infrastructure where repeatable clamping performance and long-term stability are non-negotiable.
FAQ
What is the maximum clamping voltage of SMBJ40A-E3/52 under a 10/1000 µs surge?
The SMBJ40A-E3/52 has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current of 9.3 A using the 10/1000 µs waveform. This value is measured at the device terminals under standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads), and represents the highest voltage imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMBJ40A-E3/52 suitable for automotive applications?
SMBJ40A-E3/52 itself is commercial-grade (RoHS-compliant, MSL Level 1), but Vishay offers AEC-Q101-qualified versions under ordering codes like SMBJ40AHE3_B/H. The SMBJ40A-E3/52 shares identical electrical characteristics and SMB package with those qualified variants, allowing direct design-in where qualification is handled at system level - however, for ASIL-B/C applications, the HE3-suffixed version must be specified to meet automotive reliability and traceability requirements.
How does the breakdown voltage tolerance of SMBJ40A-E3/52 affect circuit protection design?
The SMBJ40A-E3/52 specifies a breakdown voltage range of 44.4 V to 49.1 V at 1 mA test current. This ±5% tolerance means designers must ensure the protected circuit's absolute maximum voltage rating exceeds 49.1 V to avoid premature conduction, while also verifying that the clamping voltage (≤64.5 V) stays below the damage threshold of downstream components - requiring margin analysis rather than relying solely on nominal VWM = 40 V.
Can SMBJ40A-E3/52 be used in bidirectional signal protection?
No - SMBJ40A-E3/52 is strictly unidirectional, with cathode marked by a band and designed to clamp only reverse-voltage transients. For bidirectional signal lines such as RS-485, CAN, or USB data pairs, the bidirectional variant SMBJ40CA-E3/52 must be used instead, as it provides symmetrical clamping in both polarities and lacks polarity marking. Using SMBJ40A-E3/52 on AC signals risks forward conduction and failure.
What is the thermal resistance of SMBJ40A-E3/52, and how does it impact power derating?
The SMBJ40A-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W under standard mounting conditions (0.2" × 0.2" copper pads). At ambient temperatures above 25 °C, its 5.0 W steady-state power dissipation must be linearly derated - for example, at TA = 75 °C, allowable PD drops to 2.5 W. This derating curve (Fig. 2 in datasheet 88392) directly governs continuous leakage handling and must be applied in thermally constrained enclosures or high-temperature environments.
SMBJ40A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ40A-E3/52 FAQ
1.How can I place an order for SMBJ40A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40A-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 SMBJ40A-E3/52 reliable?
The price and inventory of SMBJ40A-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 SMBJ40A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ40A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40A-E3/52?
SMBJ40A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40A-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 SMBJ40A-E3/52?
For technical support, including SMBJ40A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40A-E3/52 requirements.
6.How does Aetrix verify that SMBJ40A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ40A-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 SMBJ40A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ40A-E3/52?
All SMBJ40A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40A-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 SMBJ40A-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ40A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40A-E3/52 Tags
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