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Vishay General Semiconductor - Diodes Division SMB8J33CA-E3/5B
- Part No.:
- SMB8J33CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J33CA-E3/5B.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,945
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Product details
Overview
SMB8J33CA-E3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V clamping voltage (VC) at 15 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J33CA-E3/5B datasheet, SMB8J33CA-E3/5B pinout, SMB8J33CA-E3/5B application, or SMB8J33CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.61), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within <1 ps to transients exceeding its reverse stand-off voltage. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM), while the bidirectional symmetry enables symmetric surge suppression on AC-coupled or floating lines without polarity concerns.
The SMB8J33CA-E3/5B delivers 800 W peak pulse power under standardized 10/1000 µs waveform conditions, with thermal resistance of 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead). It is rated for continuous operation from –55 °C to +150 °C and qualified per AEC-Q101 for automotive under-hood and chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing range in protected circuit |
| VBR min/max | 36.7 V / 40.6 V at 1 mA - guaranteed breakdown threshold window ensuring consistent turn-on across production lots |
| VC @ IPPM | 53.3 V at 15 A - clamping voltage during 10/1000 µs surge; limits downstream voltage stress to ≤53.3 V |
| PPPM | 800 W - peak transient energy absorption capacity under standard waveform; determines survivability against ISO 7637-2 Pulse 1/2/5a |
| ID @ VWM | ≤1 µA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance nodes |
| TJ max | +150 °C - extended junction temperature rating supports under-hood automotive deployment without derating |
| MSL Level | Level 1 (260 °C peak reflow) - enables standard lead-free SMT assembly without pre-baking |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical dual-terminal construction with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals function identically; surge current flows bidirectionally between them during overvoltage events |
| Case (body) | Thermal and mechanical interface | Plastic molded case provides UL 94 V-0 flammability rating and transfers heat to PCB copper pads (0.2" × 0.2") |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for ASIL-B system interfaces |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter stability under thermal and humidity stress |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage overshoot during clamping - critical for protecting 3.3 V or 5 V logic interfaces downstream |
| MSL Level 1 compliance | Supports direct placement into lead-free reflow ovens without moisture sensitivity concerns or baking delays |
| UL 94 V-0 molding compound | Meets flame-retardant requirements for industrial and automotive enclosures where fire safety is mandated |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN FD or LIN bus transceivers from load dump and inductive switching transients in engine control units. IC Role / Device Role: Bidirectional shunt clamp placed across differential bus lines or supply rails upstream of transceiver inputs. Use Value: Limits transient voltage to ≤53.3 V, preventing latch-up or damage to 5 V tolerant transceivers while maintaining signal integrity during normal operation. |
Use Scenario: Safeguarding PLC digital input modules connected to 24 V DC field sensors subject to relay coil flyback and ESD events. IC Role / Device Role: Primary surge suppression element mounted at connector entry point before optocoupler or Schmitt trigger input stage. Use Value: Absorbs 800 W surges without degradation, enabling robust immunity to IEC 61000-4-5 Level 3 (2 kV/1 kA) and repeated industrial switching noise. |
| Consumer USB Port ESD Protection | Telecom Line Interface |
|
Use Scenario: Secondary-level ESD protection on USB 2.0 data lines (D+/D−) in portable devices exposed to human-body model (HBM) discharges. IC Role / Device Role: Low-capacitance TVS placed after primary ESD array to handle higher-energy events that bypass front-end protection. Use Value: Clamps 8 kV HBM transients to <53.3 V within picoseconds, preserving signal rise time and preventing data corruption or PHY latch-up. |
Use Scenario: Overvoltage protection on analog telephone line interface circuits (e.g., SLIC front-end) subjected to lightning-induced surges. IC Role / Device Role: Bidirectional clamp across tip/ring lines to divert common-mode surges before transformer or codec ICs. Use Value: Withstands 10/1000 µs surges up to 15 A peak, meeting GR-1089-CORE telecom surge immunity requirements without sacrificing bandwidth. |
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 SMB package and 33 V VWM, but lower PPPM (600 W vs. 800 W); unidirectional variant SMBJ33A has asymmetric clamping | Limited to lower-energy transients; not recommended for ISO 7637-2 Pulse 5a or high-current load dump scenarios | Select SMBJ33CA-E3/5B only when surge energy demand is ≤600 W and cost optimization is prioritized over margin |
| SMCJ33CA-E3/57T | Higher PPPM (1500 W), same VWM and VC, but larger SMC (DO-214AB) package (7.11 mm × 6.22 mm vs. 4.57 mm × 3.94 mm) | Requires PCB layout revision due to 2.5× larger footprint; better suited for high-power industrial motor drives | Choose SMCJ33CA-E3/57T when system-level surge testing exceeds 800 W or when thermal dissipation demands larger copper area |
Compared with SMBJ33CA-E3/5B and SMCJ33CA-E3/57T, SMB8J33CA-E3/5B uniquely balances 800 W surge capability, AEC-Q101 qualification, and compact SMB footprint - making it optimal for space-constrained automotive and industrial modules requiring certified reliability without board redesign.
Availability
SMB8J33CA-E3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer USB port protection, and telecom line interface designs requiring stable component supply, AEC-Q101 compliance, and high-power transient immunity.
Supply support for SMB8J33CA-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMB8J series is part of Vishay's TRANSZORB® TVS portfolio, engineered for high-power-density surge suppression in automotive, industrial, and communications systems where fast response, low clamping, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMB8J33CA-E3/5B at its rated peak pulse current?
The SMB8J33CA-E3/5B exhibits a maximum clamping voltage (VC) of 53.3 V when subjected to its rated 15 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's Document Number 88422, ensuring predictable overvoltage limiting for downstream ICs such as CAN transceivers or microcontrollers. The SMB8J33CA-E3/5B maintains this clamping performance across its full operating temperature range.
Is SMB8J33CA-E3/5B suitable for automotive applications?
Yes, SMB8J33CA-E3/5B is AEC-Q101 qualified and explicitly designated for automotive use, with suffix "HE3" variants (e.g., SMB8J33CAHE3_B/I) indicating full qualification. Its –55 °C to +150 °C operating range, MSL Level 1 reflow compatibility, and validated performance under temperature cycling and HTRB testing make SMB8J33CA-E3/5B appropriate for engine control units, ADAS sensor modules, and body electronics where reliability is critical.
How does the bidirectional configuration of SMB8J33CA-E3/5B affect its circuit implementation?
The SMB8J33CA-E3/5B has no polarity marking and functions identically in both directions, allowing direct placement across AC-coupled lines, differential buses (e.g., RS-485, CAN), or floating power rails without orientation constraints. Unlike unidirectional TVS diodes, SMB8J33CA-E3/5B protects against positive and negative transients using the same device - simplifying BOM management and eliminating risk of incorrect installation during SMT assembly.
What is the thermal resistance of SMB8J33CA-E3/5B, and how does it impact PCB layout?
SMB8J33CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures during repetitive surges, PCB layout must provide minimum pad dimensions and thermal vias to internal ground planes - undersized pads will cause premature thermal shutdown or parametric shift in SMB8J33CA-E3/5B performance.
Does SMB8J33CA-E3/5B meet RoHS and halogen-free requirements?
Yes, the "E3" suffix in SMB8J33CA-E3/5B denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads. It meets JEDEC JESD201 Class 2 whisker resistance and UL 94 V-0 flammability standards. While not halogen-free (that requires "M3" suffix), SMB8J33CA-E3/5B is fully compliant with EU RoHS Directive 2011/65/EU and China RoHS, and is suitable for export to regulated markets without restriction.
SMB8J33CA-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):
- 15A
- 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)
SMB8J33CA-E3/5B FAQ
1.How can I place an order for SMB8J33CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J33CA-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 SMB8J33CA-E3/5B reliable?
The price and inventory of SMB8J33CA-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 SMB8J33CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J33CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J33CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J33CA-E3/5B?
SMB8J33CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J33CA-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 SMB8J33CA-E3/5B?
For technical support, including SMB8J33CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J33CA-E3/5B requirements.
6.How does Aetrix verify that SMB8J33CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J33CA-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 SMB8J33CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J33CA-E3/5B?
All SMB8J33CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J33CA-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 SMB8J33CA-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J33CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J33CA-E3/5B Tags
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