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Vishay General Semiconductor - Diodes Division SMBJ33CA-E3/52
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- Part No.:
- SMBJ33CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CA-E3/52.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:25,023
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Product details
Overview
SMBJ33CA-E3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 33 V standoff voltage (VWM), 53.3 V maximum clamping voltage (VC) at 11.3 A peak pulse current, and 600 W peak pulse power capability with a 10/1000 µs waveform - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ33CA-E3/52 datasheet, SMBJ33CA-E3/52 pinout, SMBJ33CA-E3/52 application, or SMBJ33CA-E3/52 equivalent, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, JEDEC DO-214AA package compatibility, and AEC-Q101 qualification readiness for automotive-grade designs.
Technical Context
This device operates as a voltage-clamped shunt protector: during transient events exceeding 33 V, it avalanches symmetrically in both directions to clamp the line at ≤53.3 V while diverting up to 11.3 A (10/1000 µs). Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), with thermal resistance RθJA = 100 °C/W enabling operation from –55 °C to +150 °C.
The SMBJ33CA-E3/52 exhibits bidirectional breakdown voltage (VBR) of 36.7–40.6 V at 1 mA test current, reverse leakage <1.0 µA at VWM, and temperature coefficient of VBR = 0.100 %/°C - confirming predictable voltage drift across temperature and suitability for precision-critical protection paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - maximum continuous reverse operating voltage before clamping initiates |
| VC @ IPPM | 53.3 V at 11.3 A - clamping voltage under 600 W 10/1000 µs surge, defining protected circuit's worst-case overvoltage |
| PPPM | 600 W - peak pulse power handling per single transient, validated per IEC 61000-4-5 |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - symmetric bidirectional breakdown threshold with tight tolerance |
| ID @ VWM | <1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on circuits |
| TJ Range | –55 °C to +150 °C - supports under-hood automotive, industrial control, and outdoor telecom deployments |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMD footprint with 5.21 mm × 4.06 mm body and 2.20 mm height |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to protected line; conducts during positive or negative overvoltage excursions |
| Cathode | Transient return path (bidirectional) | Identical electrical role to Anode; device has no functional polarity - terminals interchangeable |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., RS-485), and floating sensors without polarity concerns |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes let-through energy to downstream ICs - critical for protecting 3.3 V or 5 V logic rails |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without moisture sensitivity handling |
| AEC-Q101 qualified option | HE3 suffix variants available for automotive applications requiring stress-tested reliability |
Applications
| Industrial Sensor Interface | RS-485 Communication Line |
|---|---|
|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O lines of pressure/temperature sensors in factory automation cabinets exposed to relay switching transients. IC Role / Device Role / Timing Role: Shunt TVS diode placed between signal line and ground, clamping EFT bursts (IEC 61000-4-4) and surge events (IEC 61000-4-5). Use Value: Limits induced overvoltage to ≤53.3 V, preventing latch-up or gate oxide damage in connected ADCs and microcontrollers. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., MAX13487) in building management systems subject to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Bidirectional TVS connected across A/B differential pair and ground, suppressing common-mode surges without distorting signal integrity. Use Value: Maintains data validity by clamping transients within 1 ns while adding <1 pF capacitance - no baud rate limitation up to 10 Mbps. |
| Telecom Power Feeding | Automotive Body Control Module |
|
Use Scenario: Overvoltage protection on -48 V DC power feeds for remote radio units in cellular base stations, where accidental contact with AC mains may occur. IC Role / Device Role / Timing Role: Bidirectional TVS placed between feed line and chassis ground, absorbing high-energy surges from fault conditions. Use Value: Handles 600 W pulses without failure, ensuring uninterrupted PoE-like power delivery and meeting GR-1089-CORE immunity requirements. |
Use Scenario: Protecting LIN bus nodes and switch inputs in door module ECUs subjected to load dump and jump-start transients per ISO 7637-2. IC Role / Device Role / Timing Role: Clamping device on 12 V supply rail and LIN signal line, rated for 150 °C ambient and automotive vibration. Use Value: Withstands repetitive 10/1000 µs surges up to 11.3 A while maintaining <1 µA leakage - preserving sleep-mode current budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package | No difference in circuit design or layout; differs only in material compliance certification | Select when halogen-free BOM compliance is required per IPC-1752A or OEM green directives |
| SAC33CA-13-F | Same VWM/VC but lower PPPM (400 W); smaller SOD-123FL package (2.7 × 1.7 mm) | Lower surge margin; unsuitable for IEC 61000-4-5 Level 4; limited thermal mass for repetitive events | Choose only for space-constrained consumer designs with verified sub-400 W threat profiles |
Compared with SMBJ33CA-E3/52, the M3/52 offers identical protection performance with halogen-free construction, while SAC33CA-13-F trades surge robustness and thermal capacity for miniaturization - making the SMBJ33CA-E3/52 optimal for industrial and automotive applications demanding full 600 W rating and DO-214AA mechanical stability.
Availability
SMBJ33CA-E3/52 is available at Aetrix Electronics and suitable for industrial sensor interface, RS-485 communication line, and telecom power feeding applications requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for SMBJ33CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and infrastructure equipment where failure resilience is non-negotiable.
FAQ
What is the clamping voltage of SMBJ33CA-E3/52 at its rated peak pulse current?
The SMBJ33CA-E3/52 clamps to a maximum of 53.3 V when subjected to its specified peak pulse current of 11.3 A (10/1000 µs waveform). This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMBJ33CA-E3/52 unidirectional or bidirectional, and how does that affect PCB layout?
SMBJ33CA-E3/52 is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity dependence. Unlike unidirectional variants, it carries no cathode band marking and allows either terminal to connect to the protected line - eliminating orientation constraints and simplifying automated placement on PCBs with AC-coupled or differential signals.
Does SMBJ33CA-E3/52 meet automotive qualification standards?
The base SMBJ33CA-E3/52 is commercial-grade; however, Vishay offers AEC-Q101 qualified versions under ordering codes such as SMBJ33CAHE3_B/H. These variants undergo stress testing per automotive reliability standards and are suitable for body electronics, infotainment, and ADAS subsystems - while the E3/52 itself is optimized for industrial and telecom use cases.
What is the thermal resistance and maximum junction temperature of SMBJ33CA-E3/52?
SMBJ33CA-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended copper pads (0.2" × 0.2"), and a maximum operating junction temperature (TJ) of +150 °C. This enables reliable operation in sealed enclosures or high-ambient environments like motor drives and outdoor base stations without forced cooling.
How does the leakage current of SMBJ33CA-E3/52 impact low-power sensor circuits?
SMBJ33CA-E3/52 exhibits ≤1.0 µA maximum reverse leakage current at its 33 V standoff voltage (VWM), making it suitable for battery-powered or energy-harvesting sensor nodes. This ultra-low leakage avoids measurable drain on microamp-level sleep currents - preserving multi-year operational life in IoT edge devices and wireless transmitters.
SMBJ33CA-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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 11.3A
- 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)
SMBJ33CA-E3/52 FAQ
1.How can I place an order for SMBJ33CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CA-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 SMBJ33CA-E3/52 reliable?
The price and inventory of SMBJ33CA-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 SMBJ33CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ33CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CA-E3/52?
SMBJ33CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CA-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 SMBJ33CA-E3/52?
For technical support, including SMBJ33CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ33CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ33CA-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 SMBJ33CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ33CA-E3/52?
All SMBJ33CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CA-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 SMBJ33CA-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ33CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CA-E3/52 Tags
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