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Vishay General Semiconductor - Diodes Division SMBJ33-E3/5B
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- Part No.:
- SMBJ33-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33-E3/5B.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,465
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Product details
Overview
SMBJ33-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V maximum clamping voltage (VC) at 11.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial motor drives, automotive body control modules, and industrial sensor interfaces.
For engineers reviewing the SMBJ33-E3/5B datasheet, SMBJ33-E3/5B pinout, SMBJ33-E3/5B application, or SMBJ33-E3/5B equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under surge conditions, RoHS-compliant commercial-grade packaging, and direct alternatives validated for similar transient suppression roles in 24–48 V DC systems.
Technical Context
This unidirectional TVS diode operates as a fast-acting shunt clamp during voltage transients, leveraging an avalanche breakdown mechanism to limit transient energy before it reaches downstream ICs or MOSFETs. Its 1.0 µA max reverse leakage at 33 V and 0.1 % duty cycle repetitive surge capability support stable operation in low-power standby circuits.
The device exhibits 100 °C/W junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads and maintains clamping performance across -55 °C to +150 °C operating junction temperature range. Its 20 °C/W junction-to-lead resistance enables effective heat dissipation into PCB copper when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 24 V nominal systems. |
| VBR (min/max) | 36.7 V / 40.6 V at IT = 1 mA - Confirmed breakdown threshold ensures predictable turn-on during ESD or load-switching transients. |
| VC @ IPPM | 53.3 V at 11.3 A - Clamped voltage seen by protected circuit during 600 W 10/1000 µs surge; limits stress on 3.3 V/5 V logic or 40 V-rated MOSFETs. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity testing. |
| IPPM | 11.3 A - Peak surge current corresponding to VC; determines minimum trace width and fuse coordination in protection path. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in under-hood automotive or enclosed industrial enclosures without forced cooling. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C peak reflow), UL 94 V-0 rated compound. Polarity marked by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail); avalanche conduction occurs from cathode to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity requirements for industrial and automotive electronics. |
| 53.3 V clamping voltage at 11.3 A | Protects 40 V-rated MOSFETs and 3.3 V/5 V logic ICs from damage during 1 kV surge events. |
| 1.0 µA max reverse leakage at VWM | Minimizes standby power loss in battery-backed or energy-sensitive applications. |
| 150 °C max junction temperature | Supports deployment in high-temperature environments such as engine control units or sealed power supplies. |
| RoHS-compliant, commercial-grade (E3 suffix) | Meets environmental compliance for global industrial and consumer product certifications without halogen restrictions. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Shunt-clamp TVS placed directly across 24 V supply input to suppress >100 V transients within <1 ns response time. Use Value: Prevents latch-up or permanent damage to STM32H7-based controllers and STGAP2SIC gate drivers during 100 ms coil de-energization. |
Use Scenario: Safeguarding LIN bus transceivers and door module MCUs from battery dump and load-dump transients. IC Role / Device Role / Timing Role: Unidirectional clamp on 12 V supply rail upstream of TJA1021 transceiver, activated within 0.5 ns. Use Value: Maintains communication integrity during ISO 7637-2 Pulse 5a (75 V/400 ms) events without system reset or data corruption. |
| Industrial Sensor Interfaces | Power Supply Input Protection |
|
Use Scenario: Shielding 4–20 mA current-loop sensors and RS-485 nodes from ESD and field wiring surges. IC Role / Device Role / Timing Role: TVS placed at connector entry point, clamping transients before they reach MAX1487E or ADuM1201 isolators. Use Value: Ensures >8 kV contact ESD immunity (IEC 61000-4-2) and prevents false triggering of analog front-end ADCs. |
Use Scenario: Primary overvoltage protection on AC/DC converter DC output feeding PLC backplane rails. IC Role / Device Role / Timing Role: First-line clamp on 48 V output, coordinated with MOV and fuse to absorb 600 W surge energy. Use Value: Limits downstream voltage excursion to ≤55 V during lightning-induced surges, preserving 60 V-rated capacitors and regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No difference in circuit function or layout; selected where halogen-free material compliance is mandated. | Choose when meeting IPC-1752A or EU green procurement policies is required. |
| SMCJ33A-E3/57T | Same VWM/VC but in larger SMC (DO-214AB) package; 1500 W PPPM, lower RθJA (50 °C/W). | Higher surge margin and better thermal performance, but requires larger PCB area and different pad layout. | Prefer when system-level surge testing exceeds IEC 61000-4-5 Level 4 or ambient temperature exceeds 85 °C. |
Compared with SMBJ33-E3/5B, SMBJ33A-M3/5B offers identical protection performance with halogen-free construction, while SMCJ33A-E3/57T provides higher surge capacity and thermal headroom at the cost of increased footprint - enabling design flexibility across cost, compliance, and ruggedness tiers.
Availability
SMBJ33-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and industrial sensor interfaces requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ33-E3/5B 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-reliability transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and telecom infrastructure where fast response and repeatable clamping are critical.
FAQ
What is the clamping voltage of SMBJ33-E3/5B at its rated peak pulse current?
The SMBJ33-E3/5B has a maximum clamping voltage (VC) of 53.3 V at 11.3 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ33-E3/5B maintains this clamping performance across its full operating temperature range, ensuring consistent protection in both ambient and elevated thermal conditions.
Is SMBJ33-E3/5B suitable for automotive applications?
SMBJ33-E3/5B is a commercial-grade, RoHS-compliant part and is not AEC-Q101 qualified. For automotive use, Vishay specifies the HE3/HM3 variants (e.g., SMBJ33AHE3_B/I). While SMBJ33-E3/5B may function in non-safety-critical automotive subsystems, it lacks the stress-test validation required for body control modules or infotainment systems. Always verify qualification status via the full ordering code before deployment in automotive designs involving SMBJ33-E3/5B.
What is the thermal resistance of SMBJ33-E3/5B, and how does it affect PCB layout?
The SMBJ33-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes minimal copper area; increasing pad size or adding thermal vias reduces RθJA and improves surge survivability. For repeated surge events, PCB layout must ensure adequate copper pour and avoid narrow traces between SMBJ33-E3/5B and ground plane to prevent localized heating that could degrade clamping consistency.
How does SMBJ33-E3/5B differ from bidirectional variants like SMBJ33CA?
SMBJ33-E3/5B is unidirectional and conducts only during positive transients on its cathode relative to anode, making it ideal for DC rail protection. In contrast, SMBJ33CA is bidirectional and clamps transients of either polarity - used in AC lines or differential buses like RS-485. SMBJ33-E3/5B offers lower leakage (<1 µA at 33 V) and tighter VBR tolerance than SMBJ33CA, but cannot protect against negative-going surges unless paired with additional components. Selection depends strictly on signal polarity and system grounding architecture.
What is the surge current rating of SMBJ33-E3/5B, and how is it tested?
SMBJ33-E3/5B is rated for 11.3 A peak pulse current (IPPM) under the standardized 10/1000 µs double-exponential waveform defined by R.E.A. and referenced in IEC 61000-4-5. This test condition simulates lightning-induced surges and inductive switching transients. The rating assumes non-repetitive pulses at 0.01 % duty cycle and is validated using the mounting conditions specified in the datasheet - namely, 0.2" × 0.2" copper pads. Exceeding this current without derating risks irreversible junction damage in SMBJ33-E3/5B.
SMBJ33-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 10.2A
- 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)
SMBJ33-E3/5B FAQ
1.How can I place an order for SMBJ33-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33-E3/5B 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 SMBJ33-E3/5B reliable?
The price and inventory of SMBJ33-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ33-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33-E3/5B?
SMBJ33-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33-E3/5B 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 SMBJ33-E3/5B?
For technical support, including SMBJ33-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33-E3/5B requirements.
6.How does Aetrix verify that SMBJ33-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ33-E3/5B 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 SMBJ33-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ33-E3/5B?
All SMBJ33-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33-E3/5B, 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 SMBJ33-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ33-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33-E3/5B Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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