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Vishay General Semiconductor - Diodes Division SMBJ33CA-M3/5B
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- Part No.:
- SMBJ33CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CA-M3/5B.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ33CA-M3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V clamping voltage (VC) at 11.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial sensor interfaces.
For engineers reviewing the SMBJ33CA-M3/5B datasheet, SMBJ33CA-M3/5B pinout, SMBJ33CA-M3/5B application, or SMBJ33CA-M3/5B equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VBR ≈ 1.38), halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 33 V), but triggers into low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream ICs. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns).
The device is rated for repetitive 600 W surges (10/1000 µs), derated above 25 °C per Fig. 2, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W. It meets MSL Level 1 (260 °C reflow peak) and supports AEC-Q101 qualification via HM3 variant - though SMBJ33CA-M3/5B itself is commercial-grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe operating margin below clamping threshold |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - guaranteed breakdown range ensuring consistent turn-on across production lots |
| VC @ IPPM | 53.3 V at 11.3 A - clamping voltage during 10/1000 µs surge; limits stress on protected circuitry |
| PPPM | 600 W - peak pulse power handling capacity; enables protection against IEC 61000-4-5 Level 4 surges |
| IPPM | 11.3 A - maximum non-repetitive peak pulse current supported with 10/1000 µs waveform |
| TJ max. | +150 °C - maximum junction temperature; allows operation in industrial ambient environments up to +125 °C with proper layout |
| Package | SMB (DO-214AA) - standardized 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts positive or negative surge voltage relative to cathode; both terminals function identically in CA devices |
| Cathode | Transient current exit (bidirectional) | Completes low-impedance path to ground or return rail during clamping; no band marking on SMBJ33CA-M3/5B |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power | Supports IEC 61000-4-5 4th-level surge immunity (4 kV line-to-line, 2 kV line-to-ground) with margin |
| Halogen-free & RoHS-compliant (M3) | Meets IPC-1752A material declaration requirements and JEDEC J-STD-20D reflow profile |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage overshoot during transient events, reducing risk of latch-up in protected ICs |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard 260 °C Pb-free reflow without baking preconditioning |
Applications
| Industrial Sensor Signal Lines | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protecting analog output (0–10 V) and digital I/O (CAN/LIN) lines in factory-floor pressure/temperature sensors exposed to relay coil flyback and ESD. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point, clamping transients before they reach ADC front-end or microcontroller GPIO. Use Value: Limits induced voltage to ≤53.3 V during 11.3 A surge, preventing damage to 3.3 V/5 V logic and preserving measurement integrity. |
Use Scenario: Safeguarding LIN bus transceivers and power window motor drivers in door modules subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS mounted across LIN differential pair and VBAT-GND rails to absorb ±100 V/50 ms load dump energy. Use Value: Maintains signal integrity by clamping LIN bus voltage within ±53.3 V while surviving 600 W pulses without degradation. |
| Telecom Power Input Stages | Consumer USB-C Port Protection |
|
Use Scenario: Secondary-side overvoltage suppression on 48 V PoE-powered equipment (e.g., IP cameras), where DC-DC converter faults may generate >60 V spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between isolated DC-DC output and downstream regulator input to clamp fault-induced overvoltage. Use Value: Activates at 36.7 V and clamps to 53.3 V, allowing upstream OVP circuits time to respond while preventing MOSFET gate oxide rupture. |
Use Scenario: Bidirectional protection of USB-C CC and VCONN pins against hot-plug ESD (±15 kV contact) and cable-induced transients. IC Role / Device Role / Timing Role: Low-capacitance TVS integrated into USB-C receptacle PCB layout adjacent to connector pins. Use Value: Sub-1 ns response time and 53.3 V clamping prevent data corruption and port controller latch-up during real-world plug/unplug events. |
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-E3/5B | RoHS-compliant with lead finish; same electrical specs but uses standard tin plating instead of matte tin (M3) | No difference in surge performance; slightly higher whisker risk per JESD 201 Class 2 vs. M3's enhanced mitigation | Select E3 for cost-sensitive commercial designs where halogen-free requirement is not mandated |
| SAC33CA-13-F | Same VWM/VC ratings but in smaller SOD-123 package (lower PPPM = 400 W); different thermal resistance (RθJA = 170 °C/W) | Not suitable for 600 W surge events; limited to lower-energy transients like ESD or low-duty-cycle switching noise | Choose SAC33CA-13-F only when board space is critical and surge threat level is ≤IEC 61000-4-2 Level 4 |
Compared with SMBJ33CA-E3/5B, the M3 version offers superior long-term reliability in humid environments due to halogen-free molding compound and enhanced whisker resistance; versus SAC33CA-13-F, SMBJ33CA-M3/5B delivers 50 % higher surge power handling and 41 % lower thermal resistance - essential for sustained industrial operation.
Availability
SMBJ33CA-M3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, telecom power inputs, and consumer USB-C port protection requiring stable component supply and halogen-free compliance.
Supply support for SMBJ33CA-M3/5B 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, MOSFETs, and protection devices with emphasis on reliability and application-specific optimization.
The SMBJ series was developed for high-power, surface-mount transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and infrastructure equipment where failure tolerance and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ33CA-M3/5B at its rated peak pulse current?
The SMBJ33CA-M3/5B has a maximum clamping voltage (VC) of 53.3 V at 11.3 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ33CA-M3/5B maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) when mounted per recommended pad layout.
Is SMBJ33CA-M3/5B suitable for automotive applications?
SMBJ33CA-M3/5B is a commercial-grade device and is not AEC-Q101 qualified. For automotive use, Vishay offers the HM3 variant (e.g., SMBJ33CAHM3_B/I), which adds AEC-Q101 qualification while retaining identical electrical parameters. The SMBJ33CA-M3/5B itself meets MSL Level 1 and RoHS/halogen-free requirements but lacks the extended temperature cycling and lifetime validation required for under-hood deployment.
How does the bidirectional design of SMBJ33CA-M3/5B affect its circuit placement?
The bidirectional configuration of SMBJ33CA-M3/5B eliminates polarity constraints - it can be placed across any two nodes requiring symmetrical overvoltage protection, such as AC signal lines, differential buses (LIN, RS-485), or ungrounded power rails. Unlike unidirectional TVS diodes, SMBJ33CA-M3/5B requires no orientation check during assembly and provides identical clamping for positive and negative transients, simplifying layout and reducing BOM complexity.
What is the thermal resistance of SMBJ33CA-M3/5B, and how does it impact PCB layout?
SMBJ33CA-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repetitive surges, designers must provide adequate copper area and avoid excessive trace length between the SMBJ33CA-M3/5B and ground/power planes. Reducing pad size or using thinner copper increases RθJA, potentially limiting surge duty cycle.
Does SMBJ33CA-M3/5B meet UL recognition standards?
Yes, SMBJ33CA-M3/5B carries Underwriters Laboratories recognition under UL 497B (QVGQ2) for protector classification, with file number E136766. This certification confirms compliance for use in secondary-circuit surge protection applications, including telecom, industrial control, and consumer electronics - supporting safety agency approvals for end equipment without additional component-level testing.
SMBJ33CA-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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-M3/5B FAQ
1.How can I place an order for SMBJ33CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CA-M3/5B 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 SMBJ33CA-M3/5B reliable?
The price and inventory of SMBJ33CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ33CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CA-M3/5B?
SMBJ33CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CA-M3/5B 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 SMBJ33CA-M3/5B?
For technical support, including SMBJ33CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ33CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ33CA-M3/5B 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 SMBJ33CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ33CA-M3/5B?
All SMBJ33CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CA-M3/5B, 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 SMBJ33CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ33CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CA-M3/5B Tags
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Diodes Incorporated
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