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Vishay General Semiconductor - Diodes Division SMB8J33CA-E3/52
- Part No.:
- SMB8J33CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J33CA-E3/52.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J33CA-E3/52 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.
For engineers reviewing the SMB8J33CA-E3/52 datasheet, SMB8J33CA-E3/52 pinout, SMB8J33CA-E3/52 application, or SMB8J33CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification for automotive use, low incremental surge resistance, and compatibility with automated SMT placement on PCBs requiring robust ESD and lightning surge immunity.
Technical Context
This device operates as a voltage-clamping protector using an avalanche junction structure, responding within <1 ps to transients. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity sensitivity, and its glass-passivated chip ensures stable leakage performance (<1 μA at VWM) across -55 °C to +150 °C operating range.
The SMB8J33CA-E3/52 delivers 800 W peak pulse power under standardized 10/1000 μs surge conditions, with thermal resistance of 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling reliable operation on minimum 0.2" × 0.2" copper pads per terminal. It meets J-STD-020 MSL Level 1 and is qualified to AEC-Q101 for automotive under-hood and infotainment applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 33 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 36.7–40.6 V at 1 mA - Voltage at which avalanche conduction begins; ensures precise turn-on during overvoltage events |
| VC (Clamping Voltage) | 53.3 V at 15 A IPPM - Maximum voltage seen by protected circuit during 10/1000 μs surge; determines downstream IC survivability |
| PPPM (Peak Pulse Power) | 800 W - Energy-handling capacity under standard surge waveform; supports IEC 61000-4-5 Level 3/4 compliance |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - Minimal standby current draw; critical for low-power sensor and battery-backed circuits |
| TJ max. | +150 °C - Enables deployment in under-hood automotive environments and industrial enclosures without derating |
| AEC-Q101 Qualified | Yes - Validated for automotive reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals suitable for AC line or differential pair protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; clamps voltage in either direction above VBR - eliminates orientation concerns during placement |
| Case (body) | Thermal and mechanical interface | Plastic molded case with UL 94 V-0 rating; transfers heat to PCB copper pads (0.2" × 0.2" min.) for sustained surge handling |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, RS-485 buses, and antenna feeds without external polarity management |
| AEC-Q101 qualification | Validated for automotive-grade reliability including 1000-cycle temperature cycling and 1000-hr HTRB at 150 °C |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on downstream ICs - e.g., protects 3.3 V or 5 V logic interfaces even during 15 A surges |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow at 260 °C peak without baking - compatible with standard SMT assembly lines |
| Glass-passivated junction | Ensures stable VBR and low leakage over time and temperature; prevents parametric drift in harsh environments |
Applications
| Automotive Sensor Interface Protection | Industrial RS-485 Communication Line |
|---|---|
Use Scenario: Protecting CAN/LIN bus nodes and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in engine control units. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching MCU or signal conditioner. Use Value: Withstands 800 W surges while limiting voltage to ≤53.3 V - preserves integrity of 5 V tolerant automotive microcontrollers and ADC front-ends. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD230) against EFT, ESD, and lightning-induced surges in factory automation networks. IC Role / Device Role / Timing Role: Paired across A/B differential lines to clamp common-mode transients without distorting data eye or adding capacitance-induced jitter. Use Value: 1.0 μA leakage at 33 V VWM avoids bias current errors in precision termination networks; 53.3 V VC ensures transceiver survival during 4 kV contact ESD per IEC 61000-4-2. |
| Consumer USB-C Port ESD Suppression | Telecom DSL Line Surge Protection |
Use Scenario: Secondary-level protection on USB-C CC, VBUS, and SBU lines in portable devices where primary TVS may be undersized for system-level surge tests. IC Role / Device Role / Timing Role: Fast-response clamping element placed after board-level ESD diodes to absorb residual energy from 10/1000 μs surges per IEC 61000-4-5. Use Value: 800 W PPPM rating handles combined ESD + surge stress; RoHS-compliant matte tin leads ensure solder joint reliability in lead-free reflow profiles. |
Use Scenario: Front-end protection of ADSL/VDSL line drivers and SLIC circuits exposed to induced surges on outdoor telecom cables. IC Role / Device Role / Timing Role: Bidirectional clamp installed between transformer secondary and line driver IC to limit voltage excursions during lightning-induced ring-trip events. Use Value: 33 V VWM aligns with typical DSL line DC bias; 53.3 V VC stays below absolute maximum ratings of common SLICs like MAX232A, preventing latch-up or permanent damage. |
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 | Unidirectional variant with same VWM/VBR/VC but asymmetric conduction - conducts only in reverse direction | Requires polarity-aware layout; unsuitable for AC or differential lines without series blocking diodes | Select when protecting DC-biased unidirectional lines (e.g., 12 V power rail) where forward conduction must be blocked |
| SMAJ33CA-E3/52 | Same electrical specs but in smaller SMA (DO-214AC) package - lower PPPM (400 W), higher RθJA (110 °C/W) | Limited to lower-energy surges; requires tighter thermal design due to reduced pad area and power dissipation | Choose for space-constrained consumer boards where 400 W surge margin suffices and footprint reduction outweighs thermal trade-offs |
Compared with SMBJ33CA-E3/52 and SMAJ33CA-E3/52, the SMB8J33CA-E3/52 offers balanced bidirectional protection with higher surge capacity than SMAJ variants and greater layout flexibility than unidirectional SMBJ types - making it optimal for automotive and industrial differential interfaces where polarity independence and 800 W immunity are required.
Availability
SMB8J33CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial communication gateways, consumer USB-C accessories, and telecom line cards requiring stable component supply with AEC-Q101 assurance and RoHS compliance.
Supply support for SMB8J33CA-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power density, and application-specific qualification.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, automotive-grade transient suppression in harsh electromagnetic environments - targeting ESD, EFT, and lightning surge compliance across transportation and industrial sectors.
FAQ
What is the clamping voltage of SMB8J33CA-E3/52 at its rated peak pulse current?
The SMB8J33CA-E3/52 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 standards and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is SMB8J33CA-E3/52 suitable for automotive applications?
Yes, SMB8J33CA-E3/52 is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junctions, MSL Level 1 moisture sensitivity, and validation across temperature cycling, high-temperature reverse bias, and ESD stress tests - making it appropriate for engine control units, ADAS sensors, and infotainment systems where reliability under thermal and electrical stress is mandatory.
How does the bidirectional nature of SMB8J33CA-E3/52 affect PCB layout?
The SMB8J33CA-E3/52 has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies layout for AC-coupled interfaces like RS-485, CAN FD, or antenna feeds - no need for silkscreen indicators or assembly verification. Designers can place it symmetrically across differential pairs or across power/ground rails without concern for cathode/anode alignment.
What is the maximum operating temperature for SMB8J33CA-E3/52?
The SMB8J33CA-E3/52 has a maximum junction temperature (TJ max.) of +150 °C and operates across -55 °C to +150 °C. This wide range supports deployment in under-hood automotive locations, industrial motor drives, and outdoor telecom equipment. Derating curves in the datasheet show usable surge capacity down to 50% at 125 °C ambient when mounted on recommended 0.2" × 0.2" copper pads.
Does SMB8J33CA-E3/52 meet RoHS and halogen-free requirements?
Yes, the SMB8J33CA-E3/52 carries the "E3" suffix, indicating full RoHS compliance per EU Directive 2011/65/EU. It uses matte tin-plated leads and halogen-free molding compound meeting IEC 61249-2-21 standards. The device also satisfies JESD 201 Class 2 whisker resistance and UL 94 V-0 flammability requirements - verified in Vishay Document Number 88422.
SMB8J33CA-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:
- -
- 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-E3/52 FAQ
1.How can I place an order for SMB8J33CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J33CA-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 SMB8J33CA-E3/52 reliable?
The price and inventory of SMB8J33CA-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 SMB8J33CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J33CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J33CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J33CA-E3/52?
SMB8J33CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J33CA-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 SMB8J33CA-E3/52?
For technical support, including SMB8J33CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J33CA-E3/52 requirements.
6.How does Aetrix verify that SMB8J33CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J33CA-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 SMB8J33CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J33CA-E3/52?
All SMB8J33CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J33CA-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 SMB8J33CA-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J33CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J33CA-E3/52 Tags
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