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Vishay General Semiconductor - Diodes Division SMBJ33CA-E3/5B
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- Part No.:
- SMBJ33CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ33CA-E3/5B.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,311
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Product details
Overview
SMBJ33CA-E3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 33 V stand-off voltage (VWM), 53.3 V maximum clamping voltage at 11.3 A peak pulse current (IPPM), and 600 W peak pulse power capability with 10/1000 µs waveform - used to protect MOSFETs, sensor interfaces, and industrial I/O circuits against ESD and inductive switching surges.
For engineers reviewing the SMBJ33CA-E3/5B datasheet, SMBJ33CA-E3/5B pinout, SMBJ33CA-E3/5B application, or SMBJ33CA-E3/5B equivalent, key selection criteria include bidirectional clamping symmetry, low clamping ratio (VC/VWM = 1.61), JEDEC-compliant SMB package footprint, and AEC-Q101 qualification eligibility via HE3/HM3 variants.
Technical Context
This device operates as a voltage-clamped surge protector with symmetrical breakdown behavior in both polarities due to its bidirectional construction. Its 33 V stand-off voltage ensures stable operation below transient thresholds, while the 53.3 V clamping voltage limits downstream stress during 11.3 A 10/1000 µs pulses.
Thermal performance is defined by 100 °C/W junction-to-ambient thermal resistance and 20 °C/W junction-to-lead resistance, enabling reliable operation up to +150 °C junction temperature. The glass-passivated junction and MSL Level 1 moisture sensitivity rating support robust reflow assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - Confirmed bidirectional breakdown range; ensures symmetric overvoltage triggering in either polarity. |
| VC (Clamping Voltage) | 53.3 V at IPPM = 11.3 A - Peak voltage seen by protected circuit during worst-case 10/1000 µs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability under standardized 10/1000 µs waveform; validates protection level per IEC 61000-4-5. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Ultra-low leakage preserves signal integrity and minimizes standby power loss in high-impedance nodes. |
| TJ max | +150 °C - Maximum junction temperature rating; supports deployment in under-hood automotive or industrial ambient environments. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge conduction path | No functional distinction between terminals; either pin serves as input/output for transient energy diversion in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated surge handling per IEC 61000-4-5 Level 4; enables single-device protection for industrial Ethernet and CAN bus interfaces. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to downstream ICs - critical for 3.3 V or 5 V logic interfacing with unprotected analog or digital sensors. |
| MSL Level 1, 260 °C reflow compatible | Eliminates need for moisture preconditioning prior to assembly; reduces manufacturing risk and cost in high-volume SMT lines. |
| Glass passivated junction | Ensures long-term reliability and stable electrical parameters across temperature and humidity cycling; meets industrial lifetime requirements. |
| AEC-Q101 qualification path | HE3/HM3 suffix variants available for automotive applications; supports functional safety-critical subsystems requiring validated component qualification. |
Applications
| Industrial PLC I/O Protection | Automotive Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V DC analog input channels in programmable logic controllers from inductive kickback and field wiring surges. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to shunt transients before reaching ADC front-end or isolation barrier. Use Value: 53.3 V clamping prevents damage to 30 V-rated op-amps and protects ±10 V measurement ranges from >1 kV fast transients. |
Use Scenario: Safeguarding LIN or CAN FD sensor nodes (e.g., pressure, temperature) against battery dump and load dump events in vehicle cabins. IC Role / Device Role / Timing Role: Primary surge suppression element located upstream of transceiver IC, absorbing energy before it reaches PHY layer. Use Value: Symmetrical clamping maintains signal integrity on bidirectional buses; 1.0 µA leakage avoids bias current errors in precision sensor bridges. |
| Consumer Appliance Motor Control | Telecom Power Rail Protection |
|
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, HVAC blowers). IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to clamp flyback voltage and reduce EMI coupling into MCU supply rails. Use Value: 600 W rating handles repetitive 10/1000 µs spikes from PWM-driven motors; SMB footprint allows placement adjacent to motor connectors. |
Use Scenario: Guarding 48 V PoE-powered equipment (e.g., IP cameras, wireless access points) against lightning-induced surges on data/power pairs. IC Role / Device Role / Timing Role: Secondary-level protection on DC input rail after primary gas discharge tube or MOV, providing precise clamping near IC absolute maximum ratings. Use Value: 33 V VWM aligns with 48 V nominal systems using 3.3 V LDOs; 53.3 V VC ensures safe margin below 60 V input stage breakdown. |
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-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package. | No difference in circuit function or layout; selected where halogen-free compliance is mandated (e.g., EU public infrastructure projects). | Direct material substitution when halogen-free certification is required; same thermal and surge performance. |
| SAC33CA-13-F | Same VWM (33 V) and bidirectional configuration, but in smaller SOD-123FL package (lower PPPM = 400 W). | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 or high-current inductive loads. | Select only for space-constrained consumer designs with verified <400 W surge exposure; not drop-in for industrial use cases. |
Compared with SMBJ33CA-E3/5B, the M3/5B variant offers identical protection performance with halogen-free materials, while SAC33CA-13-F trades surge capacity for footprint reduction - making the original SMBJ33CA-E3/5B optimal for robust, standards-compliant industrial and automotive deployments.
Availability
SMBJ33CA-E3/5B is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive sensor interface hardening, and telecom 48 V power rail safeguarding requiring stable component supply and full traceability.
Supply support for SMBJ33CA-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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive electronics, and telecommunications infrastructure where consistent clamping performance and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMBJ33CA-E3/5B at its rated peak pulse current?
The SMBJ33CA-E3/5B has a maximum clamping voltage (VC) of 53.3 V at its specified peak pulse current (IPPM) of 11.3 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ33CA-E3/5B maintains this clamping performance bidirectionally due to its symmetrical junction structure.
Is SMBJ33CA-E3/5B suitable for automotive applications?
SMBJ33CA-E3/5B itself is commercial-grade, but Vishay offers AEC-Q101-qualified versions under HE3 and HM3 suffixes (e.g., SMBJ33CAHE3_B/I). These variants share identical electrical characteristics and SMB package dimensions, enabling direct replacement where automotive qualification is required. The SMBJ33CA-E3/5B remains appropriate for non-safety-critical automotive subsystems with internal validation.
How does the bidirectional design of SMBJ33CA-E3/5B affect PCB layout?
The SMBJ33CA-E3/5B has no polarity marking and exhibits identical electrical behavior in both directions, simplifying PCB layout by eliminating orientation constraints. Engineers can place the SMBJ33CA-E3/5B without regard to anode/cathode alignment - ideal for protecting AC-coupled signals, differential buses like RS-485, or dual-rail power domains where transient polarity is unpredictable.
What is the thermal resistance of SMBJ33CA-E3/5B, and how does it impact power dissipation?
The SMBJ33CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W. At 5.0 W steady-state power dissipation, this results in a 500 °C rise above ambient - confirming that the device is intended for transient-only operation. Continuous power must remain well below 5.0 W; the SMBJ33CA-E3/5B relies on short-duration surges, not sustained loading.
Does SMBJ33CA-E3/5B meet any industry surge immunity standards?
Yes - the 600 W peak pulse power rating of SMBJ33CA-E3/5B with a 10/1000 µs waveform aligns with IEC 61000-4-5 Ed. 3 (surge immunity testing), supporting Level 4 (4 kV line-to-earth, 2 kV line-to-line) when properly implemented with PCB layout and system grounding. Its clamping voltage and response time also satisfy requirements for EN 61000-6-2 and ISO 7637-2 Pulse 1/2a/3a in automotive contexts.
SMBJ33CA-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:
- -
- 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-E3/5B FAQ
1.How can I place an order for SMBJ33CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ33CA-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 SMBJ33CA-E3/5B reliable?
The price and inventory of SMBJ33CA-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 SMBJ33CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ33CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ33CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ33CA-E3/5B?
SMBJ33CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ33CA-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 SMBJ33CA-E3/5B?
For technical support, including SMBJ33CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ33CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ33CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ33CA-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 SMBJ33CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ33CA-E3/5B?
All SMBJ33CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ33CA-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 SMBJ33CA-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ33CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ33CA-E3/5B Tags
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