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Vishay General Semiconductor - Diodes Division SMBJ33A-E3/52
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- Part No.:
- SMBJ33A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33A-E3/52.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:11,607
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Product details
Overview
SMBJ33A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of DC power rails and signal lines. 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 in industrial motor drives, automotive body control modules, and PoE-powered Ethernet interfaces.
For engineers reviewing the SMBJ33A-E3/52 datasheet, SMBJ33A-E3/52 pinout, SMBJ33A-E3/52 application, or SMBJ33A-E3/52 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 with automated SMT placement, and compliance with AEC-Q101 when specified with HE3 suffix.
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), then rapidly avalanches below 40.6 V to limit transients. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
Designed for single-polarity DC systems, SMBJ33A-E3/52 uses cathode-band polarity identification and delivers sub-nanosecond response time. It is rated for repetitive 0.01% duty cycle surges and derates linearly above 25 °C ambient per Fig. 2 in the datasheet, with maximum junction temperature of +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - guaranteed avalanche initiation window; ensures consistent clamping onset across production lots |
| VC @ IPPM | 53.3 V at 11.3 A - peak clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure |
| PPPM | 600 W - peak pulse power handling capability; supports IEC 61000-4-5 Level 4 surge immunity testing |
| IPPM | 11.3 A - maximum non-repetitive surge current; defines minimum trace width and PCB copper pad area (0.2" × 0.2") |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance; requires thermal relief design for sustained 5 W dissipation at elevated ambient |
| TJmax | +150 °C - absolute maximum junction temperature; sets upper limit for power derating and system thermal management |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0 and J-STD-002 solderability standards. Cathode identified by molded band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction; connected to lower-potential side of protected line | Not used in standard TVS operation; only relevant for forward-bias verification or bidirectional variants |
| Cathode | Current exit terminal during reverse avalanche; connected to higher-potential side (e.g., VCC rail) | Band-marked lead; must be routed to protected node to enable clamping action against positive transients |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity up to 4 kV (line-earth) without external series impedance |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes overvoltage stress on downstream ICs such as microcontrollers or CAN transceivers during ESD/EFT events |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress and humidity exposure |
| RoHS-compliant, commercial-grade (E3 suffix) | Meets EU RoHS Directive 2011/65/EU and JEDEC JESD201 Class 2 whisker resistance for high-volume manufacturing |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 24 V DC power inputs against inductive kickback from relay coils and solenoid drivers. IC Role / Device Role / Timing Role: Shunt clamping device placed between VBAT and GND, triggered within <1 ns upon exceeding 33 V. Use Value: Limits transient voltage to ≤53.3 V, preventing latch-up or gate oxide damage in MOSFET drivers and MCU power supplies. |
Use Scenario: Safeguarding LIN bus transceivers and door module microcontrollers from load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-LIN line, clamping positive spikes only. Use Value: Withstands 11.3 A surge current while maintaining clamping below 53.3 V - compatible with ISO 7637-2 Pulse 1/2a/5a test profiles. |
| Power over Ethernet (PoE) PSE Ports | Industrial Sensor Signal Conditioning |
|
Use Scenario: Secondary-side overvoltage suppression on 48 V DC power pairs feeding IEEE 802.3af/at PD devices. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across each power pair (VPSE+–VPSE−) to clamp common-mode surges. Use Value: 33 V VWM allows safe operation under 48 V nominal with 20% tolerance; 600 W rating handles PoE+ inrush and lightning-induced transients. |
Use Scenario: Protecting analog front-end inputs (e.g., 4–20 mA loop receivers) from ESD and field wiring transients. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 33 V) unidirectional TVS placed across input terminals to ground. Use Value: Sub-µA reverse leakage avoids signal offset errors; fast response preserves integrity of low-level sensor signals (<10 mV resolution). |
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-E3/52 | Bidirectional variant; symmetrical VBR (36.7–40.6 V) in both polarities; no cathode band marking | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, USB D+/D−); unsuitable for DC rail protection where polarity matters | Select SMBJ33CA-E3/52 only when protecting balanced differential signals or floating nodes subject to bipolar transients |
| SMAJ33A-E3/52 | Lower 400 W PPPM; same VWM/VBR/VC but reduced IPPM (9.0 A); SMA (DO-214AC) package, 20% smaller footprint | Acceptable for lower-energy threats (IEC 61000-4-2 ±8 kV contact); insufficient for IEC 61000-4-5 Level 4 (4 kV) | Choose SMAJ33A-E3/52 only if space-constrained and surge threat level is limited to ESD or low-energy switching noise |
Compared with SMBJ33CA-E3/52 and SMAJ33A-E3/52, SMBJ33A-E3/52 provides optimal balance of 600 W surge capacity, unidirectional polarity control, and SMB package manufacturability - making it the preferred choice for 24–48 V DC power rail protection where directional clamping and high-energy immunity are required.
Availability
SMBJ33A-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and Power over Ethernet (PoE) PSE ports requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ33A-E3/52 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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive qualification.
The SMBJ series was developed specifically for high-energy transient suppression in harsh environments - targeting industrial automation, transportation, and telecom infrastructure where robustness and repeatable clamping performance are critical.
FAQ
What is the maximum clamping voltage of SMBJ33A-E3/52 under surge conditions?
The SMBJ33A-E3/52 has a maximum clamping voltage (VC) of 53.3 V at 11.3 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage seen by protected circuitry during worst-case surge events. The SMBJ33A-E3/52 maintains this clamping performance across its qualified operating temperature range.
Is SMBJ33A-E3/52 suitable for automotive applications?
SMBJ33A-E3/52 is RoHS-compliant and qualified to commercial grade specifications. For automotive use, Vishay offers the AEC-Q101-qualified variant SMBJ33AHE3_B/H (with HE3 suffix). The SMBJ33A-E3/52 itself is not AEC-Q101 certified and should not be used in safety-critical automotive systems unless validated per customer-specific requirements.
How does the SMBJ33A-E3/52 differ from the SMBJ33CA-E3/52?
The SMBJ33A-E3/52 is unidirectional with cathode-band polarity marking and clamps only positive transients relative to ground. The SMBJ33CA-E3/52 is bidirectional, offering symmetrical clamping for both polarities and no polarity marking. Their VBR, VWM, and VC values are identical, but circuit integration differs significantly - SMBJ33A-E3/52 is used on DC rails, SMBJ33CA-E3/52 on AC or differential lines.
What is the thermal resistance and power derating behavior of SMBJ33A-E3/52?
The SMBJ33A-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W on standard 0.2" × 0.2" copper pads. Its 5.0 W steady-state power dissipation derates linearly above 25 °C ambient, reaching zero at +75 °C. Full 600 W surge capability is limited to single pulses with ≤0.01% duty cycle, as defined in Figure 2 of the Vishay datasheet 88392.
Can SMBJ33A-E3/52 be used in place of SMAJ33A-E3/52?
SMBJ33A-E3/52 is not a direct replacement for SMAJ33A-E3/52 due to higher peak pulse power (600 W vs. 400 W), larger SMB package (vs. SMA), and different thermal characteristics. While both share 33 V VWM and similar VBR, substituting SMBJ33A-E3/52 requires PCB layout revision and may over-specify cost and board area. Use SMBJ33A-E3/52 only when 600 W surge rating is explicitly required.
SMBJ33A-E3/52 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-E3/52 FAQ
1.How can I place an order for SMBJ33A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33A-E3/52 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-E3/52 reliable?
The price and inventory of SMBJ33A-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ33A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33A-E3/52?
SMBJ33A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33A-E3/52 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-E3/52?
For technical support, including SMBJ33A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33A-E3/52 requirements.
6.How does Aetrix verify that SMBJ33A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ33A-E3/52 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-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ33A-E3/52?
All SMBJ33A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33A-E3/52, 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-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ33A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33A-E3/52 Tags
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