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Vishay General Semiconductor - Diodes Division SMBJ33A/54
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- Part No.:
- SMBJ33A/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33A/54.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,807
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Product details
Overview
SMBJ33A/54 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown range at 1 mA, 53.3 V maximum clamping voltage at 11.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed to safeguard MOSFETs, ICs, and sensor interfaces against inductive switching transients in industrial and telecom systems.
For engineers reviewing the SMBJ33A/54 datasheet, SMBJ33A/54 pinout, SMBJ33A/54 application, or SMBJ33A/54 equivalent, key selection criteria include clamping performance under 11.3 A surge, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, SMB (DO-214AA) package compatibility, and compliance with AEC-Q101 when ordered with HE3/HM3 suffixes.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 33 V), but avalanches rapidly (<1 ps response) when transient voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surges.
Rated for -55 °C to +150 °C junction temperature, SMBJ33A/54 delivers 600 W peak pulse power with 0.01% duty cycle, derated linearly above 25 °C ambient per Fig. 2 of the datasheet. The device meets UL 497B recognition (QVGQ2) and J-STD-020 MSL Level 1 moisture sensitivity classification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR @ IT = 1 mA | 36.7–40.6 V - Measured breakdown range confirming tight tolerance for predictable turn-on during transients. |
| VC @ IPPM = 11.3 A | 53.3 V - Clamping voltage under full-rated 10/1000 µs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 600 W - Peak pulse power handling capability with standard 10/1000 µs waveform; validates suitability for IEC 61000-4-5 Level 4 surges. |
| IPPM | 11.3 A - Peak pulse current corresponding to 600 W at 53.3 V; used to size PCB trace width and verify layout survivability. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on 0.2" × 0.2" copper pads; informs thermal design for sustained surge repetition. |
| TJmax | +150 °C - Maximum junction temperature; sets upper limit for ambient + self-heating in high-duty-cycle applications. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band on body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or common return path; completes conduction path during avalanche event. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 33 V rail or signal); carries full surge current into anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against severe lightning-induced surges per IEC 61000-4-5 without external series impedance. |
| 53.3 V clamping at 11.3 A | Limits voltage overshoot across protected ICs to safe levels even under worst-case 600 W surge conditions. |
| Glass passivated junction | Ensures stable VBR and low leakage over temperature and lifetime, critical for automotive and industrial field reliability. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without pre-baking or special handling requirements. |
| AEC-Q101 qualification option | Available with HE3/HM3 suffixes for automotive-grade deployment in engine control, ADAS, and infotainment subsystems. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontrollers from flyback voltage spikes generated by relay or solenoid coil de-energization. IC Role / Device Role / Timing Role: Shunt clamping element placed across DC bus or logic supply rails to clamp transients within safe operating area of downstream ICs. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic controllers by limiting spike amplitude to ≤53.3 V during 11.3 A surges. |
Use Scenario: Input-stage surge suppression on 48 V telecom rectifier outputs exposed to lightning-induced surges on outside plant wiring. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side distribution rail, coordinated with upstream MOVs and gas discharge tubes. Use Value: Maintains system uptime by absorbing 600 W transients without degradation, meeting GR-1089-CORE Level 4 immunity requirements. |
| Automotive Body Control Modules | Consumer Sensor Interfaces |
|
Use Scenario: Protection of LIN bus transceivers and power management ICs against load dump and jump-start transients in 12 V vehicle networks. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground, triggered only on positive overvoltage events. Use Value: Withstands 100 A IFSM half-sine surges and maintains <1 µA leakage at 33 V, ensuring low quiescent current in always-on modules. |
Use Scenario: ESD and EFT protection on analog output lines of temperature/humidity sensors connected to microcontroller ADC inputs. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF typical at 0 V) shunt suppressor on signal path, minimizing signal distortion. Use Value: Clamps fast 8 kV HBM ESD events to <53.3 V within picoseconds while adding negligible loading to mV-level sensor signals. |
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 | Bidirectional variant with same VWM (33 V), symmetric clamping in both polarities, higher VBR min/max (36.7–40.6 V same), identical PPPM. | Required where AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN) need protection against ± transients. | Select SMBJ33CA only if bidirectional clamping is required; SMBJ33A/54 is optimal for DC rails with defined polarity. |
| SAC33 | Same VWM (33 V) and VC (53.3 V), but lower PPPM (400 W), smaller SMA package (DO-214AC), RθJA = 120 °C/W. | Suitable for space-constrained consumer designs with lower surge exposure; not rated for industrial 600 W events. | Choose SAC33 only for cost- or size-sensitive applications with verified <400 W threat levels; SMBJ33A/54 provides higher margin for harsh environments. |
Compared with SMBJ33CA and SAC33, SMBJ33A/54 offers superior 600 W surge handling in a robust SMB package with industry-standard thermal performance, making it the preferred choice for industrial and automotive DC rail protection where unidirectional clamping suffices.
Availability
SMBJ33A/54 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and consumer sensor interfaces requiring stable component supply and long-term manufacturability.
Supply support for SMBJ33A/54 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 is engineered for high-energy transient suppression in demanding environments, targeting industrial automation, automotive electronics, and infrastructure equipment where failure resilience is mission-critical.
FAQ
What is the maximum clamping voltage of SMBJ33A/54 under rated surge conditions?
The SMBJ33A/54 exhibits a maximum clamping voltage (VC) of 53.3 V when subjected to its rated 11.3 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured per Figure 1 and Table 1 of the Vishay datasheet 88392 and defines the upper voltage limit imposed on protected circuitry during full-power transient events. Designers use this parameter to verify that downstream components remain within their absolute maximum ratings.
Is SMBJ33A/54 suitable for automotive applications?
SMBJ33A/54 itself is a commercial-grade part, but Vishay offers AEC-Q101 qualified versions under ordering codes SMBJ33AHE3 and SMBJ33AHM3. These variants undergo extended stress testing for temperature cycling, humidity, and surge endurance, making them suitable for automotive body control modules and infotainment systems. The base SMBJ33A/54 should be used only in non-automotive contexts unless explicitly qualified per customer requirements.
How does the SMBJ33A/54 differ from the SMBJ33CA variant?
The SMBJ33A/54 is unidirectional, with cathode marked by a band and clamping active only for positive transients relative to its anode. The SMBJ33CA is bidirectional, offering symmetrical clamping for both polarities and no polarity marking. Both share identical VWM (33 V), VBR, VC, and PPPM, but SMBJ33CA is required for AC signal lines like RS-485 or CAN, whereas SMBJ33A/54 is optimized for DC power rails with known polarity.
What is the thermal resistance of SMBJ33A/54, and how does it affect layout?
SMBJ33A/54 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. This value assumes minimum recommended pad layout per Vishay's package drawing. To maintain safe junction temperatures during repetitive surges, designers must ensure adequate copper area and avoid excessive trace length or isolation - reducing RθJA improves surge repetition rate capability and long-term reliability.
Does SMBJ33A/54 meet any safety or flammability standards?
Yes - the SMBJ33A/54 molding compound meets UL 94 V-0 flammability rating, and the device carries Underwriters Laboratories recognition (QVGQ2) under UL 497B for protector classification, with file number E136766. This certification validates its use in safety-critical surge protection circuits across industrial, telecom, and consumer equipment where fire risk mitigation is mandated.
SMBJ33A/54 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/54 FAQ
1.How can I place an order for SMBJ33A/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33A/54 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/54 reliable?
The price and inventory of SMBJ33A/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33A/54 is usually 5 days.
3.What payment methods are accepted for SMBJ33A/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33A/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33A/54?
SMBJ33A/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33A/54 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/54?
For technical support, including SMBJ33A/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33A/54 requirements.
6.How does Aetrix verify that SMBJ33A/54 is sourced from the original manufacturer or authorized distributors?
All SMBJ33A/54 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/54 meets industry standards.
7.What is the process for return or replacement of SMBJ33A/54?
All SMBJ33A/54 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33A/54, 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/54 part is unused and in its original packaging.
Return procedure for SMBJ33A/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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