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Vishay General Semiconductor - Diodes Division SMB8J33C-E3/5B
- Part No.:
- SMB8J33C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J33C-E3/5B.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,009
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Product details
Overview
SMB8J33C-E3/5B from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection on signal and power lines. It features 33 V stand-off voltage (VWM), 53.3 V maximum clamping voltage at 15 A peak pulse current, and 800 W peak pulse power rating with 10/1000 µs waveform. It is AEC-Q101 qualified and used to protect automotive sensor interfaces and industrial I/O lines against ESD and load-dump transients.
For engineers reviewing the SMB8J33C-E3/5B datasheet, SMB8J33C-E3/5B pinout, SMB8J33C-E3/5B application, or SMB8J33C-E3/5B equivalent, key selection criteria include bi-directional clamping capability, 33 V working voltage compatibility with 3.3 V–24 V systems, thermal resistance (RθJA = 72 °C/W), and RoHS-compliant, lead-free matte tin plating per J-STD-002.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 µA at VWM), while the low incremental surge resistance supports consistent clamping under repetitive surge events.
The device meets MSL Level 1 per J-STD-020 (peak reflow 260 °C) and is rated for -55 °C to +150 °C operating junction temperature. Its 72 °C/W junction-to-ambient thermal resistance requires minimum 5.0 mm × 5.0 mm copper pad area per terminal for full 800 W rating compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse stand-off voltage before clamping begins; compatible with 24 V nominal automotive and industrial bus systems. |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - Verified breakdown threshold ensures reliable turn-on above system operating voltage with margin. |
| VC @ IPPM | 53.3 V at 15 A - Clamping voltage limits downstream IC stress during 10/1000 µs surge; enables robust protection of 33 V-rated receivers. |
| PPPM | 800 W - Peak pulse power handling with 10/1000 µs waveform; sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | <1 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in battery-powered sensors. |
| RθJA | 72 °C/W - Thermal resistance defines required PCB copper area (0.2" × 0.2") to sustain full power rating without exceeding 150 °C junction limit. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with no polarity marking - symmetrical terminals suitable for AC or differential line protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge path | No designated anode/cathode; either terminal serves as input/output - simplifies layout for balanced lines like RS-485 or CAN FD. |
| Case (body) | Thermal conduction path | Plastic body transfers heat to PCB copper pads; requires 5.0 mm × 5.0 mm minimum pad area per terminal for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), and ungrounded sensor outputs without polarity concerns. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, chassis, and ADAS modules where extended temperature operation and long-term reliability are mandatory. |
| Glass-passivated junction | Ensures stable VBR over lifetime and improved resistance to humidity-induced parameter drift in harsh industrial environments. |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 260 °C peak without preconditioning - eliminates moisture sensitivity handling overhead. |
| RoHS-compliant matte tin plating | Guarantees solderability per J-STD-002 and whisker resistance per JESD 201 Class 1A - critical for high-reliability industrial assemblies. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
|
Use Scenario: Protecting analog output pins of pressure/temperature sensors in engine control units exposed to load-dump and jump-start transients. IC Role / Device Role / Timing Role: Bi-directional TVS placed between sensor output and microcontroller ADC input to clamp ±60 V transients within 1 ns. Use Value: Prevents ADC saturation and latch-up by limiting voltage to 53.3 V while maintaining sub-1 µA leakage at 33 V supply. |
Use Scenario: Shielding RS-485 transceiver data lines (A/B) in factory automation PLCs subjected to EFT and surge per IEC 61000-4-4/5. IC Role / Device Role / Timing Role: Symmetric clamping device installed across differential pair to suppress common-mode and differential-mode surges simultaneously. Use Value: Maintains signal integrity below 53.3 V clamping level without adding capacitance that degrades 10 Mbps data rates. |
| Smart Meter Power Line | Medical Patient Monitor I/O |
|
Use Scenario: Safeguarding 33 V auxiliary power rail in smart electricity meters against lightning-induced surges on AC mains coupling paths. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converter, absorbing up to 800 W of 10/1000 µs energy. Use Value: Enables compliance with IEC 61000-4-5 Level 3 (2 kV line-earth) using a single discrete component with no derating needed at 25 °C. |
Use Scenario: Protecting isolated analog front-end inputs of patient monitors connected to external transducers via unshielded cables. IC Role / Device Role / Timing Role: Low-leakage bi-directional TVS on signal lines to prevent ESD damage during clinical handling while preserving microvolt-level signal fidelity. Use Value: Sub-1 µA leakage at 33 V ensures <0.1 µV offset error contribution in 100 dB CMRR instrumentation amplifiers. |
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 | Same DO-214AA package and 33 V VWM, but rated for 600 W PPPM (vs. 800 W); lower IPPM (12.3 A vs. 15 A). | Acceptable for lower-energy threats (e.g., IEC 61000-4-2 ESD only), not recommended for ISO 7637-2 Pulse 5a load-dump. | Select when cost sensitivity outweighs need for full automotive surge margin. |
| SMCJ33CA-E3/5B | DO-214AB (SMC) package, same 33 V VWM, higher 1500 W PPPM rating and 39.4 A IPPM; RθJA = 38 °C/W. | Better thermal performance allows sustained surge handling in compact layouts; larger footprint (7.11 mm × 6.22 mm vs. 4.57 mm × 3.94 mm). | Choose when board space permits and higher surge immunity is required without derating. |
Compared with SMBJ33CA-E3/5B, SMB8J33C-E3/5B delivers 33 % higher surge power headroom; versus SMCJ33CA-E3/5B, it trades 43 % smaller footprint for 47 % higher thermal resistance - making it optimal for space-constrained automotive modules needing AEC-Q101 validation and 800 W capability.
Availability
SMB8J33C-E3/5B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial RS-485 networks, smart meter auxiliary rails, and medical I/O isolation requiring stable component supply with AEC-Q101 traceability and RoHS compliance.
Supply support for SMB8J33C-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and power efficiency.
The SMB8J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in automotive and industrial environments where space, thermal performance, and surge margin are critical.
FAQ
What is the clamping voltage of SMB8J33C-E3/5B at its rated peak pulse current?
The SMB8J33C-E3/5B has a maximum clamping voltage (VC) of 53.3 V at 15 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and ensures downstream circuitry remains within safe voltage limits during standardized surge events. The clamping performance is guaranteed across the full operating temperature range of -55 °C to +150 °C.
Is SMB8J33C-E3/5B suitable for automotive applications?
Yes, SMB8J33C-E3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including engine control, body electronics, and ADAS sensor interfaces. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and validated performance across -55 °C to +150 °C. The "HE3" variant is also available for enhanced automotive qualification, but SMB8J33C-E3/5B itself carries full AEC-Q101 certification per Vishay document 88422.
How does the bi-directional design of SMB8J33C-E3/5B affect its PCB layout?
The bi-directional nature of SMB8J33C-E3/5B eliminates polarity marking - both terminals are functionally identical, allowing placement across differential pairs (e.g., CAN H/L or RS-485 A/B) without orientation constraints. Layout requires symmetric 5.0 mm × 5.0 mm copper pads per terminal for thermal management, and no ground plane isolation is needed since the device does not reference system ground for clamping action.
What is the reverse leakage current of SMB8J33C-E3/5B at its stand-off voltage?
At its 33 V stand-off voltage (VWM), the SMB8J33C-E3/5B exhibits a maximum reverse leakage current (ID) of 1.0 µA at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor circuits and minimizes power loss in always-on battery-powered systems. Leakage remains below 5 µA up to 125 °C, ensuring stable operation across automotive temperature extremes.
Can SMB8J33C-E3/5B replace SMBJ33CA-E3/5B in an existing design?
SMB8J33C-E3/5B can replace SMBJ33CA-E3/5B in most cases due to identical DO-214AA package, pin-compatible footprint, and matching 33 V VWM. However, SMB8J33C-E3/5B offers 800 W peak pulse power (vs. 600 W) and higher IPPM (15 A vs. 12.3 A), providing greater surge margin. No PCB changes are required, but layout should verify copper pad area meets 5.0 mm × 5.0 mm minimum per terminal for full rating utilization.
SMB8J33C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 13.6A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J33C-E3/5B FAQ
1.How can I place an order for SMB8J33C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J33C-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 SMB8J33C-E3/5B reliable?
The price and inventory of SMB8J33C-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 SMB8J33C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J33C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J33C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J33C-E3/5B?
SMB8J33C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J33C-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 SMB8J33C-E3/5B?
For technical support, including SMB8J33C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J33C-E3/5B requirements.
6.How does Aetrix verify that SMB8J33C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J33C-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 SMB8J33C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J33C-E3/5B?
All SMB8J33C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J33C-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 SMB8J33C-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J33C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J33C-E3/5B Tags
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Diodes Incorporated
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