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Vishay General Semiconductor - Diodes Division SM6T33CA-E3/52
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- Part No.:
- SM6T33CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33CA-E3/52.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,668
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Product details
Overview
SM6T33CA-E3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping ESD and surge transients on signal/power lines. It features 33 V standoff voltage (VWM), 37.1–41.0 V breakdown (VBR at 1 mA), 600 W peak pulse power (10/1000 μs), <1 μA reverse leakage at VWM, and clamps to ≤59 V at 13.1 A IPPM. Used to protect sensor interfaces and automotive control modules against inductive switching surges.
For engineers reviewing the SM6T33CA-E3/52 datasheet, SM6T33CA-E3/52 pinout, SM6T33CA-E3/52 application, or SM6T33CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, 600 W surge rating with low clamping voltage, SMB package compatibility with automated SMT assembly, and AEC-Q101 qualification availability for automotive-grade reliability validation.
Technical Context
The SM6T33CA-E3/52 operates as a symmetrical, bidirectional avalanche diode with no polarity marking - its terminals are interchangeable for AC-coupled or differential line protection. It delivers consistent clamping performance in both directions due to matched P-N junctions, enabling use on ungrounded or floating signal paths such as CAN bus stubs or RS-485 differential pairs.
Its thermal design relies on low RθJL (20 °C/W) and moderate RθJA (100 °C/W), requiring minimum 5.0 mm × 5.0 mm copper pads per terminal for full 600 W rating. The device is glass passivated, meets J-STD-020 MSL Level 1, and supports peak reflow up to 260 °C - critical for high-yield surface-mount manufacturing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - guaranteed avalanche onset range ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | ≤59 V at 13.1 A (10/1000 μs) - clamping voltage directly limits stress on downstream ICs like microcontrollers or transceivers. |
| PPPM | 600 W - peak surge handling capacity under standardized lightning/surge waveform; enables IEC 61000-4-5 Level 3 compliance with proper layout. |
| ID @ VWM | <1 μA - ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes. |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMT outline with 5.59 mm length, 3.94 mm width, and 2.20 mm height; compatible with standard pick-and-place feeders. |
Pinout & Package
SMB (DO-214AA) surface-mount package with matte tin-plated leads; no polarity marking for bidirectional operation - both terminals are functionally identical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | No cathode band; either terminal serves as anode or cathode depending on instantaneous voltage polarity - eliminates orientation errors during placement. |
| Lead 1 / Lead 2 | Surge current path | Both leads conduct equal peak pulse current (IPPM = 13.1 A); must be routed to equal copper area (≥5.0 mm × 5.0 mm) for thermal derating compliance. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges without external series impedance. |
| Glass passivated chip junction | Ensures long-term stability of breakdown voltage and leakage under humidity and thermal cycling stress (JESD22-A101). |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow without popcorn cracking or parameter shift - eliminates pre-baking requirements. |
| AEC-Q101 qualified option available | HE3/HM3 variants meet automotive qualification for engine control, body electronics, and ADAS sensor interfaces. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bays exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transients before reaching ADC input or signal conditioner. Use Value: Clamps 33 V nominal lines to ≤59 V during 13.1 A surges - prevents latch-up or gate oxide damage in downstream op-amps and microcontrollers. | Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD230) in factory automation networks subject to ground potential differences and cable ESD. IC Role / Device Role / Timing Role: Common-mode TVS across A/B differential pair, referenced to local ground, absorbing common-mode surges without distorting data eye. Use Value: Symmetrical 37.1–41.0 V breakdown ensures balanced clamping on both lines - maintains differential integrity and avoids false triggering during fast transients. |
| Consumer USB Port ESD | Telecom DSL Line Protection |
Use Scenario: ESD protection for USB 2.0 D+/D− lines in portable audio devices where space constraints limit multi-stage designs. IC Role / Device Role / Timing Role: First-line defense against IEC 61000-4-2 ±8 kV contact discharge, placed adjacent to USB connector with minimal trace inductance. Use Value: Low clamping voltage (≤59 V) and sub-1 μA leakage preserve signal rise time and prevent false disconnect detection during hot-plug events. | Use Scenario: Overvoltage protection on twisted-pair DSL lines entering residential gateways, exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge limiter between line transformer secondary and ADSL transceiver PHY, rated for repeated 600 W pulses. Use Value: 600 W rating with 10/1000 μs waveform support allows direct coupling without series impedance - simplifies BOM and reduces board area vs. hybrid GDT+TVS solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Same VWM/VBR/VC specs but lower PPPM (400 W); SMA package (smaller footprint, higher RθJA = 140 °C/W) | Limited to lower-energy transients; less suitable for IEC 61000-4-5 Level 3 or automotive load dump | Select when board space is constrained and surge energy is limited to <400 W. |
| P6SMB33CA | Identical electrical specs and SMB package; same 600 W rating; RoHS-compliant variant with different packaging code (bulk vs. tape/reel) | No functional difference; differs only in ordering suffix and reel configuration (P6SMB33CA-T vs. SM6T33CA-E3/52) | Choose for legacy design continuity or distributor stock alignment; electrically interchangeable. |
Compared with SMAJ33CA and P6SMB33CA, the SM6T33CA-E3/52 offers identical clamping performance to P6SMB33CA but superior surge handling versus SMAJ33CA - making it optimal for automotive and industrial applications demanding full 600 W compliance with validated thermal pad layout.
Availability
SM6T33CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, and consumer USB port protection requiring stable component supply across production ramps and long-life programs.
Supply support for SM6T33CA-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive qualification.
The SM6T Series is engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, lightning, and inductive switching is non-negotiable.
FAQ
What does the "CA" suffix indicate in SM6T33CA-E3/52?
The "CA" suffix in SM6T33CA-E3/52 denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both polarities without polarity marking. Unlike unidirectional "A" variants (e.g., SM6T33A), the CA version has no cathode band and functions identically regardless of voltage polarity applied across its terminals. This makes SM6T33CA-E3/52 ideal for AC-coupled or differential signal lines where directionality is undefined.
Is SM6T33CA-E3/52 AEC-Q101 qualified?
The base SM6T33CA-E3/52 is RoHS-compliant commercial-grade; however, Vishay offers AEC-Q101 qualified versions under automotive ordering codes such as SM6T33CAHE3_B/H (HE3 suffix). These variants undergo extended stress testing including temperature cycling, HTRB, and ESD per AEC-Q101 Rev E. SM6T33CA-E3/52 itself is not automatically qualified - qualification requires explicit HE3 or HM3 suffix and associated test documentation.
What is the maximum clamping voltage of SM6T33CA-E3/52 under surge conditions?
The maximum clamping voltage (VC) of SM6T33CA-E3/52 is 59 V when subjected to a 10/1000 μs waveform at peak pulse current (IPPM) of 13.1 A. This value is measured per Figure 1 in Vishay document 88385 and represents the upper bound of voltage seen by protected circuitry during worst-case surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Can SM6T33CA-E3/52 replace SM6T33A in existing designs?
SM6T33CA-E3/52 cannot directly replace unidirectional SM6T33A without circuit review: the CA variant lacks polarity marking and conducts in both directions, which may cause unintended conduction in DC-biased circuits. In AC or differential applications (e.g., RS-485), SM6T33CA-E3/52 is preferred; in DC power rail protection, SM6T33A remains appropriate. Layout changes are not required, but system-level functionality must be verified.
What PCB layout guidelines apply to SM6T33CA-E3/52 for full 600 W rating?
To achieve the full 600 W peak pulse power rating, SM6T33CA-E3/52 must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay document 88385. Trace width should be ≥1.5 mm, and thermal vias (≥4×0.3 mm) per pad are recommended to enhance heat dissipation. Deviation from this layout reduces IPPM derating and risks thermal failure during repetitive surges.
SM6T33CA-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 13.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SM6T33CA-E3/52 FAQ
1.How can I place an order for SM6T33CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33CA-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 SM6T33CA-E3/52 reliable?
The price and inventory of SM6T33CA-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 SM6T33CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SM6T33CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33CA-E3/52?
SM6T33CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33CA-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 SM6T33CA-E3/52?
For technical support, including SM6T33CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33CA-E3/52 requirements.
6.How does Aetrix verify that SM6T33CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T33CA-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 SM6T33CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SM6T33CA-E3/52?
All SM6T33CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33CA-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 SM6T33CA-E3/52 part is unused and in its original packaging.
Return procedure for SM6T33CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33CA-E3/52 Tags
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