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Vishay General Semiconductor - Diodes Division SMBJ33CHE3/52
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- Part No.:
- SMBJ33CHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CHE3/52.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,609
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Product details
Overview
SMBJ33CHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 33 V stand-off voltage (VWM), 53.3 V maximum clamping voltage (VC) at 11.3 A peak pulse current (IPPM), and 600 W peak pulse power dissipation with a 10/1000 µs waveform - used for safeguarding MOSFETs, ICs, and sensor signal lines in industrial and automotive control systems.
For engineers reviewing the SMBJ33CHE3/52 datasheet, SMBJ33CHE3/52 pinout, SMBJ33CHE3/52 application, or SMBJ33CHE3/52 equivalent, key selection criteria include its AEC-Q101 qualification, unidirectional polarity with cathode band marking, low incremental surge resistance, and compatibility with automated SMT placement on standard PCB copper pad layouts per JEDEC MO-136.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below 33 V and rapidly transitions to low-impedance conduction above its breakdown voltage range of 36.7–40.6 V (tested at 1 mA). Its response time is sub-nanosecond, enabling effective suppression of fast-rising ESD and surge events before downstream components are damaged.
The device uses a glass-passivated silicon junction and is rated for continuous operation from –55 °C to +150 °C junction temperature. Thermal resistance is 100 °C/W (junction-to-ambient, typical) and 20 °C/W (junction-to-lead), supporting reliable performance under repetitive surge conditions when mounted on 5.0 mm × 5.0 mm copper pads per specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - Maximum DC or continuous reverse operating voltage before significant leakage; defines safe operating margin for protected circuitry. |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - Voltage at which device enters avalanche conduction; ensures robust triggering above system operating voltage. |
| VC (Clamping Voltage) | 53.3 V at 11.3 A IPPM - Maximum voltage seen by protected load during 10/1000 µs surge; determines stress level on downstream ICs or MOSFETs. |
| PPPM (Peak Pulse Power) | 600 W - Surge energy handling capability with standardized 10/1000 µs waveform; enables protection against IEC 61000-4-5 Level 3/4 surges. |
| IPPM (Peak Pulse Current) | 11.3 A - Maximum non-repetitive surge current supported at rated clamping voltage; defines transient current-handling headroom. |
| TJmax | +150 °C - Maximum junction temperature rating; supports use in under-hood automotive and high-temperature industrial environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 2.20 mm min. cathode-to-anode distance; compatible with IPC-7351B footprint and J-STD-020 reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked by cathode band on one end; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground or lower-potential rail during overvoltage event. |
| Anode (unbanded end) | Reference node | Typically tied to ground (for unidirectional configuration); establishes reference for clamping action relative to protected signal path. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for engine control units and ADAS sensor interfaces. |
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity requirements up to 4 kV (line-to-earth) without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on protected devices - critical for 3.3 V and 5 V logic interfaces where margin above supply is tight. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures stable electrical characteristics over lifetime and improved resistance to humidity-induced degradation in harsh environments. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-supplied ECUs from load dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive-going surges above 33 V. Use Value: Limits peak voltage to ≤53.3 V during 11.3 A transients, preventing damage to LDOs, microcontrollers, and CAN transceivers in AEC-Q100-compliant designs. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and field-induced surges in factory automation sensors. IC Role / Device Role / Timing Role: TVS connected across signal and return paths to shunt fast transients before reaching precision ADC inputs or op-amp buffers. Use Value: Sub-nanosecond response and 53.3 V clamping prevent latch-up or input-stage breakdown in instrumentation-grade signal conditioning circuits. |
| Telecom Interface Surge Protection | Consumer Device USB/Power Port Protection |
|
Use Scenario: Safeguarding Ethernet PHY power pins (e.g., PoE midspan injectors) against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Unidirectional SMBJ33CHE3/52 installed on 3.3 V bias rails feeding magnetics or isolation transformers. Use Value: 600 W rating handles multi-kV common-mode surges while maintaining low leakage (<1 µA at 33 V) to avoid disrupting bias networks. |
Use Scenario: Adding secondary overvoltage protection on USB-C VBUS lines after primary buck converter in portable chargers and power banks. IC Role / Device Role / Timing Role: Clamping device placed between VBUS and ground to absorb residual transients escaping upstream filtering. Use Value: Compact SMB footprint enables placement near connectors; RoHS-compliant and halogen-free construction meets IEC 62368-1 safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33AHE3/52 | Same electrical specs and AEC-Q101 qualification; differs only in packaging suffix - "HE3" denotes AEC-Q101 grade, while "AHE3" is legacy ordering code variant with identical die and test flow. | No functional difference; both support automotive and industrial use cases requiring qualified TVS diodes. | Select SMBJ33CHE3/52 for new designs aligning with current Vishay documentation and preferred part numbering. |
| SMAJ33A-E3/61 | Lower peak pulse power (400 W vs. 600 W), smaller SMA (DO-214AC) package, same VWM/VC ratings but higher RθJA (150 °C/W). | Suitable for space-constrained consumer applications with lower surge threat levels; not recommended for ISO 7637-2 or IEC 61000-4-5 Level 4. | Choose SMAJ33A-E3/61 only when board area is critical and surge energy is limited to ≤400 W; otherwise SMBJ33CHE3/52 provides superior thermal and surge margin. |
Compared with SMBJ33AHE3/52, SMBJ33CHE3/52 reflects Vishay's current preferred part number with identical performance and qualification; versus SMAJ33A-E3/61, it delivers 50 % higher surge power handling and better thermal dissipation in the larger SMB package - essential for demanding automotive and industrial deployments.
Availability
SMBJ33CHE3/52 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, telecom interface boards, and consumer power delivery systems requiring stable component supply with long-term lifecycle assurance.
Supply support for SMBJ33CHE3/52 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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, AEC-Q101 compliance, and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMBJ33CHE3/52 at its rated peak pulse current?
The SMBJ33CHE3/52 has a maximum clamping voltage (VC) of 53.3 V at its rated peak pulse current (IPPM) of 11.3 A, measured using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed per the Vishay datasheet revision 09-Jan-2024 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ33CHE3/52 maintains this clamping performance across its full operating temperature range.
Is SMBJ33CHE3/52 suitable for automotive applications?
Yes, SMBJ33CHE3/52 is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant and AEC-Q101 qualified construction. It meets requirements for temperature cycling, high-temperature reverse bias, and surge endurance relevant to engine control, body electronics, and ADAS subsystems. The SMBJ33CHE3/52 is validated for operation from –55 °C to +150 °C and supports ISO 7637-2 load dump protection when properly mounted.
How does the SMBJ33CHE3/52 differ from the SMBJ33A-E3/52?
The SMBJ33CHE3/52 is AEC-Q101 qualified, whereas SMBJ33A-E3/52 is commercial-grade only. Both share identical electrical parameters (VWM = 33 V, VC = 53.3 V, PPPM = 600 W), but SMBJ33CHE3/52 undergoes additional stress testing per AEC-Q101 and carries automotive-specific traceability and lot control. The "HE3" suffix in SMBJ33CHE3/52 confirms qualification; SMBJ33A-E3/52 lacks this validation and is intended for non-automotive applications.
What is the thermal resistance of SMBJ33CHE3/52, and how does it affect layout design?
The SMBJ33CHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W, measured on 5.0 mm × 5.0 mm copper pads per JEDEC standards. These values require adequate copper pour and thermal vias beneath the SMB footprint to maintain TJ ≤ 150 °C during repetitive surges. Layouts must follow Vishay's recommended pad dimensions (0.085" × 0.220") to ensure specified thermal and surge performance for SMBJ33CHE3/52.
Does SMBJ33CHE3/52 have polarity marking, and how is it identified?
Yes, SMBJ33CHE3/52 is unidirectional and features a visible cathode band on the SMB (DO-214AA) package - located at one end of the molded body. The banded end is the cathode and must be connected toward the side of the circuit requiring protection (e.g., to the signal line), while the unbanded end (anode) connects to ground or the lower-potential reference. This polarity is critical for correct clamping behavior; reverse connection renders the device ineffective for positive transients.
SMBJ33CHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ33CHE3/52 FAQ
1.How can I place an order for SMBJ33CHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CHE3/52 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 SMBJ33CHE3/52 reliable?
The price and inventory of SMBJ33CHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ33CHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CHE3/52?
SMBJ33CHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CHE3/52 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 SMBJ33CHE3/52?
For technical support, including SMBJ33CHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CHE3/52 requirements.
6.How does Aetrix verify that SMBJ33CHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ33CHE3/52 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 SMBJ33CHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ33CHE3/52?
All SMBJ33CHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CHE3/52, 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 SMBJ33CHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ33CHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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