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Vishay General Semiconductor - Diodes Division SMBJ33A-E3/5B
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- Part No.:
- SMBJ33A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33A-E3/5B.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,342
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Product details
Overview
SMBJ33A-E3/5B 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 stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V maximum 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 industrial sensor interfaces.
For engineers reviewing the SMBJ33A-E3/5B datasheet, SMBJ33A-E3/5B pinout, SMBJ33A-E3/5B application, or SMBJ33A-E3/5B equivalent, key selection criteria include clamping performance under 10/1000 µs surge, unidirectional polarity marking, SMB (DO-214AA) package thermal resistance (RθJA = 100 °C/W), and compliance with AEC-Q101 when specified 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), then rapidly avalanches below 53.3 V to divert transient energy away from downstream ICs. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
The device is optimized for fast response (<1 ps typical) to ESD and lightning-induced transients, with thermal design validated on 0.2" × 0.2" copper pads and rated for continuous operation from –55 °C to +150 °C junction temperature. It meets UL 497B recognition and J-STD-020 MSL Level 1 reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before significant leakage begins; sets upper limit for protected circuit's nominal DC rail. |
| VBR (min/max) | 36.7 V / 40.6 V at IT = 1 mA - guaranteed avalanche onset range; ensures reliable triggering above system operating voltage. |
| VC @ IPPM | 53.3 V at 11.3 A - clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected load. |
| PPPM | 600 W - peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| IPPM | 11.3 A - maximum non-repetitive peak pulse current; derived from 600 W clamping limit and 53.3 V clamp voltage. |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance on standard PCB pad; informs derating above 25 °C ambient. |
| TJ max | +150 °C - maximum junction temperature; enables use in under-hood automotive and high-temperature industrial enclosures. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by band on one end; anode is opposite terminal. Meets UL 94 V-0 flammability rating and JESD 22-B102 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when Vline exceeds VBR. |
| Anode (unmarked end) | Reference node | Typically tied to system ground or lower-potential rail; completes shunt path during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 surges up to 4 kV without degradation under proper PCB layout. |
| 53.3 V clamping voltage at 11.3 A | Limits transient overvoltage to safe levels for 3.3 V, 5 V, and 24 V logic and interface ICs downstream. |
| Low leakage: ≤1.0 µA at 33 V | Minimizes standby power loss and avoids false triggering in battery-powered or low-current sensor circuits. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| AEC-Q101 qualification option | Available with HE3/HM3 suffixes for automotive applications requiring stress-tested reliability and traceable lot control. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Shunt clamping element placed across DC supply input or signal line to absorb 600 W transient energy within nanoseconds. Use Value: Prevents latch-up or permanent damage to 3.3 V MCU GPIOs and MOSFET gate oxide by limiting voltage to ≤53.3 V during 10/1000 µs switching surges. |
Use Scenario: Safeguarding LIN bus transceivers and door module sensors from load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN line and chassis ground to clamp negative-going spikes while blocking normal signal swing. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 1 (–100 V, 2 Ω source) events by clamping below transceiver absolute maximum ratings. |
| Industrial Sensor Interfaces | Power Supply Input Stage |
|
Use Scenario: Shielding 4–20 mA current loop receivers and analog front-ends from ESD and field wiring transients. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS placed across input terminals to suppress ±8 kV contact ESD per IEC 61000-4-2 without affecting precision measurement. Use Value: Ensures <1 ppm error contribution to 16-bit ADC measurements while surviving repeated 8 kV ESD strikes without parameter shift. |
Use Scenario: Primary overvoltage suppression on 24 V DC input rails feeding PLC backplanes and industrial controllers. IC Role / Device Role / Timing Role: First-line defense against lightning-induced surges entering via DIN-rail power supplies or external connectors. Use Value: Limits input rail excursion to ≤53.3 V during 10/1000 µs surges, preventing upstream fuse blowout and enabling coordination with secondary MOV or crowbar stages. |
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 | Bidirectional variant; symmetric VBR (36.7–40.6 V) in both polarities; no cathode marking. | Required for AC-coupled or differential signal lines (e.g., RS-485, CAN) where polarity reversal occurs. | Select only if bidirectional clamping is needed; not interchangeable with SMBJ33A-E3/5B due to polarity and marking differences. |
| SMAJ33A-E3/52 | Same VWM/VC specs but lower PPPM (400 W); SMA (DO-214AC) package with smaller footprint and higher RθJA (140 °C/W). | Suitable for space-constrained consumer electronics with lower surge threat level (IEC 61000-4-5 Level 2). | Use when board area is critical and 400 W surge margin suffices; requires thermal derating above 25 °C due to higher thermal resistance. |
Compared with SMBJ33CA-E3/5B and SMAJ33A-E3/52, SMBJ33A-E3/5B delivers higher surge robustness (600 W vs. 400 W) in a thermally optimized SMB package, making it preferred for industrial and automotive environments where sustained 11.3 A transient currents must be safely dissipated without thermal runaway.
Availability
SMBJ33A-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and power supply input stages requiring stable component supply, RoHS-compliant commercial-grade TVS protection, and tape-and-reel delivery for automated SMT placement.
Supply support for SMBJ33A-E3/5B 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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and application-specific performance.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and telecom infrastructure where failure tolerance and long-term parametric stability are critical.
FAQ
What is the maximum clamping voltage of SMBJ33A-E3/5B under a 10/1000 µs surge?
The SMBJ33A-E3/5B has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current of 11.3 A using the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ33A-E3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ33A-E3/5B suitable for automotive applications?
SMBJ33A-E3/5B is RoHS-compliant and qualified to commercial grade standards. For automotive use, Vishay offers the AEC-Q101-qualified variant SMBJ33AHE3_B/I (with HE3 suffix), which undergoes additional stress testing for temperature cycling, humidity, and mechanical shock. The SMBJ33A-E3/5B itself is not AEC-Q101 certified and should be used only in non-safety-critical commercial or industrial systems unless validated per customer qualification protocols.
How does the SMBJ33A-E3/5B differ from the SMBJ33CA-E3/5B?
The SMBJ33A-E3/5B is unidirectional with cathode marking and clamps only in reverse bias, while the SMBJ33CA-E3/5B is bidirectional with symmetrical clamping in both polarities and no polarity marking. Their VBR, VWM, and VC values are identical, but they are not pin-compatible replacements: substituting one for the other requires circuit-level verification of polarity constraints and signal swing range. The SMBJ33A-E3/5B is intended for DC rail or single-ended signal protection.
What is the thermal resistance of SMBJ33A-E3/5B, and how does it affect layout?
The SMBJ33A-E3/5B 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. This value assumes minimum recommended pad layout per Vishay's datasheet; reducing pad area increases RθJA and requires derating of pulse power above 25 °C ambient. For sustained surge duty, thermal vias and internal ground planes are recommended to maintain SMBJ33A-E3/5B junction temperature below 150 °C.
Does SMBJ33A-E3/5B meet any safety certifications?
Yes - the SMBJ33A-E3/5B carries Underwriters Laboratories (UL) recognition under file E136766 for protectors per UL 497B, covering both unidirectional and bidirectional variants. It also complies with RoHS Directive 2011/65/EU and meets J-STD-020 MSL Level 1 reflow requirements with a maximum peak temperature of 260 °C. These certifications validate its suitability for safety-critical surge suppression in certified end equipment.
SMBJ33A-E3/5B 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:
- 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-E3/5B FAQ
1.How can I place an order for SMBJ33A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33A-E3/5B 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 SMBJ33A-E3/5B reliable?
The price and inventory of SMBJ33A-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ33A-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ33A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33A-E3/5B?
SMBJ33A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33A-E3/5B 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 SMBJ33A-E3/5B?
For technical support, including SMBJ33A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33A-E3/5B requirements.
6.How does Aetrix verify that SMBJ33A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ33A-E3/5B 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 SMBJ33A-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ33A-E3/5B?
All SMBJ33A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33A-E3/5B, 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 SMBJ33A-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ33A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33A-E3/5B Tags
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