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Vishay General Semiconductor - Diodes Division SMBJ33A-M3/52
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- Part No.:
- SMBJ33A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33A-M3/52.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,490
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Product details
Overview
SMBJ33A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode 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, and clamps transients to ≤53.3 V at 11.3 A peak pulse current (IPPM) under 10/1000 µs waveform - deployed on power rails and signal lines in industrial motor drives and automotive ECUs.
For engineers reviewing the SMBJ33A-M3/52 datasheet, SMBJ33A-M3/52 pinout, SMBJ33A-M3/52 application, or SMBJ33A-M3/52 equivalent, key selection criteria include its 600 W peak pulse power rating, halogen-free RoHS-compliant M3 suffix, SMB (DO-214AA) package with cathode band polarity marking, and suitability for IEC 61000-4-2/4-4/4-5 compliant surge protection circuits.
Technical Context
This TVS diode operates as a clamping device in unidirectional configuration, leveraging an avalanche breakdown mechanism to limit transient voltages before they damage downstream ICs or MOSFETs. Its low incremental surge resistance (typical <0.5 Ω) and sub-nanosecond response time ensure effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
The SMBJ33A-M3/52 is rated for continuous operation from –55 °C to +150 °C junction temperature, with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead). It meets J-STD-020 MSL Level 1 and is qualified to AEC-Q101 when ordered with HE3/HM3 suffixes - though the M3/52 variant is commercial-grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets upper limit for normal circuit operation. |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - guaranteed avalanche initiation range; ensures predictable clamping onset across temperature and unit variation. |
| VC (Clamping Voltage) | ≤53.3 V at 11.3 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge; defines safe margin for 3.3 V/5 V/24 V logic or gate drivers. |
| PPPM (Peak Pulse Power) | 600 W - maximum transient energy absorption capability per pulse; supports repeated 0.01% duty cycle surges without degradation. |
| IPPM (Peak Pulse Current) | 11.3 A - peak current handled at rated clamping voltage; determines minimum PCB trace width and fuse coordination. |
| TJmax | +150 °C - maximum junction temperature; enables use in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, cathode indicated by a band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during reverse-biased transient events. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 24 V rail or CAN_H); carries surge current into the diode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 4 (4 kV line-to-earth) surges without external series impedance. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for consumer, industrial, and export markets without compromising thermal or electrical performance. |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes voltage overshoot during clamping - critical for safeguarding 33 V-rated components such as automotive sensors or PLC I/O modules. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without preconditioning or special handling; eliminates moisture-related popcorning risk. |
| 100 A IFSM (8.3 ms half-sine) | Withstands high-energy inrush or fault currents in DC power distribution systems - e.g., battery disconnect events or relay coil de-energization. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 24 V DC control inputs against inductive kickback from solenoid valves and contactor coils. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and chassis ground to clamp transients up to ±1 kV. Use Value: Prevents latch-up or permanent damage to microcontroller GPIOs and level-shifter ICs exposed to >100 V spikes during load switching. |
Use Scenario: Surge suppression on LIN bus lines and sensor supply rails in door modules and seat controllers. IC Role / Device Role / Timing Role: Standoff-rated TVS connected from LIN data line to ground, responding within <1 ns to ESD events per ISO 10605. Use Value: Maintains signal integrity during 8 kV contact discharge tests while adding <1 pF capacitance - no data corruption or bus lockup. |
| Telecom Power Feeds | Consumer Appliance Control Boards |
|
Use Scenario: Overvoltage hardening of 48 V PoE-powered Ethernet switch ports against lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converter input, coordinated with GDT or MOV secondary protection. Use Value: Limits let-through voltage to <55 V, ensuring downstream buck regulator remains within absolute maximum ratings during 6 kV ring-wave transients. |
Use Scenario: Input rail protection on smart refrigerator mainboard where 12 V fan and compressor drivers generate repetitive switching noise. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 33 V) TVS shunting transient energy from shared 12 V rail to ground plane. Use Value: Eliminates false resets of MCU and communication errors in Wi-Fi module without increasing quiescent power consumption. |
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-E3/52 | Same electrical specs; RoHS-compliant but not halogen-free (uses brominated flame retardant). | Acceptable for non-halogen-restricted commercial designs; not suitable for EU WEEE or specific OEM green procurement mandates. | Select when halogen-free requirement is absent and cost sensitivity favors E3 over M3. |
| SMCJ33A-M3 | Higher 1500 W PPPM, larger SMC (DO-214AB) package, same VWM/VC ratings. | Better suited for higher-energy threats (e.g., 10/1000 µs 30 A surges); requires larger PCB area and different thermal layout. | Choose when system-level surge testing exceeds 600 W capability or when field failure analysis shows marginal clamping margin. |
Compared with SMBJ33A-E3/52, the SMBJ33A-M3/52 adds halogen-free compliance without sacrificing clamping performance or thermal robustness; versus SMCJ33A-M3, it trades peak power headroom for compact SMB footprint and lower parasitic inductance - ideal for space-constrained 24 V industrial I/O modules.
Availability
SMBJ33A-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and consumer appliance control boards requiring stable component supply and full traceability.
Supply support for SMBJ33A-M3/52 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, precision, and application-specific optimization.
The SMBJ series was engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial automation, and telecom infrastructure where consistent clamping behavior and long-term stability are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ33A-M3/52 at its rated peak pulse current?
The SMBJ33A-M3/52 has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated 11.3 A peak pulse current under the standard 10/1000 µs waveform. This value is guaranteed across temperature and process variation, and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 33 V-rated components in industrial and automotive applications.
Is SMBJ33A-M3/52 suitable for bidirectional transient protection?
No, SMBJ33A-M3/52 is a unidirectional TVS diode, intended for DC circuits where polarity is fixed - such as 24 V power rails or signal lines referenced to ground. For bidirectional AC or differential signal protection (e.g., RS-485, CAN), the bidirectional variant SMBJ33CA-M3/52 must be used, which exhibits symmetrical clamping in both directions and lacks cathode band marking.
Does SMBJ33A-M3/52 meet automotive qualification standards?
The SMBJ33A-M3/52 itself is a commercial-grade part and is not AEC-Q101 qualified. However, Vishay offers automotive-qualified versions under ordering codes SMBJ33A-HM3_X (halogen-free, AEC-Q101) and SMBJ33A-HE3_X (RoHS-compliant, AEC-Q101), where "_X" denotes revision letter. Engineers requiring automotive qualification must specify those variants explicitly - SMBJ33A-M3/52 is appropriate for industrial and consumer applications only.
What is the thermal resistance of SMBJ33A-M3/52, and how does it affect PCB layout?
The SMBJ33A-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W. To maintain safe junction temperatures under sustained power dissipation, PCB layout must provide adequate copper area: Vishay specifies 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size increases RθJA, risking thermal runaway during repetitive surge events.
How does the M3 suffix differ from E3 in SMBJ33A-M3/52?
The M3 suffix in SMBJ33A-M3/52 indicates halogen-free, RoHS-compliant construction using chlorine/bromine-free flame retardants, whereas E3 denotes RoHS compliance with standard brominated compounds. Both share identical electrical characteristics, package dimensions, and reliability testing - but M3 satisfies stricter environmental mandates (e.g., IECEE CB Scheme, certain OEM green directives) where halogen content is restricted to <900 ppm total halogens.
SMBJ33A-M3/52 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):
- 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)
SMBJ33A-M3/52 FAQ
1.How can I place an order for SMBJ33A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33A-M3/52 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 SMBJ33A-M3/52 reliable?
The price and inventory of SMBJ33A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ33A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33A-M3/52?
SMBJ33A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33A-M3/52 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 SMBJ33A-M3/52?
For technical support, including SMBJ33A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33A-M3/52 requirements.
6.How does Aetrix verify that SMBJ33A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ33A-M3/52 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 SMBJ33A-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ33A-M3/52?
All SMBJ33A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33A-M3/52, 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 SMBJ33A-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ33A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33A-M3/52 Tags
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