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Vishay General Semiconductor - Diodes Division SM6T33CA-E3/5B
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- Part No.:
- SM6T33CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33CA-E3/5B.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,600
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Product details
Overview
SM6T33CA-E3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 600 W peak pulse power (10/1000 μs), 33 V breakdown voltage (VBR = 31.4–34.7 V at IT = 1.0 mA), and 45.7 V maximum clamping voltage (VC) at IPPM. It protects signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SM6T33CA-E3/5B datasheet, SM6T33CA-E3/5B pinout, SM6T33CA-E3/5B application, or SM6T33CA-E3/5B equivalent, key selection criteria include bidirectional polarity, 100 °C/W junction-to-ambient thermal resistance, AEC-Q101 qualification eligibility (via HE3/HM3 suffix variants), low inductance, and RoHS-compliant matte tin plating.
Technical Context
This bidirectional TVS operates symmetrically in both polarities with identical VBR, VWM (28.2 V), and VC characteristics. Its glass-passivated junction ensures stable breakdown behavior under repetitive surge stress, and its low-inductance SMB package supports fast transient response (<1 ns typical turn-on time).
The device complies with J-STD-020 MSL Level 1 (260 °C peak reflow), has a maximum operating junction temperature of +150 °C, and delivers 600 W peak pulse power when mounted on 5.0 mm × 5.0 mm copper pads - critical for automotive ECU and ADAS sensor interface protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at IT = 1.0 mA - defines precise clamping onset threshold for bidirectional overvoltage events |
| VWM | 28.2 V - maximum continuous reverse stand-off voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | 45.7 V at 13.1 A (10/1000 μs) - actual clamped voltage seen by protected IC during worst-case surge |
| PPPM | 600 W - peak transient energy absorption capability without failure under standardized waveform |
| RθJA | 100 °C/W - thermal resistance limiting junction temperature rise under sustained 5.0 W power dissipation |
| TJ range | −65 °C to +150 °C - enables operation in under-hood automotive environments and industrial enclosures |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as anode or cathode depending on instantaneous polarity - enables single-device protection of AC or differential signal lines |
| Case (cathode band absent) | Non-electrical mechanical reference | No functional marking; orientation irrelevant for electrical operation - simplifies automated placement and eliminates polarity verification step |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Withstands high-energy transients from load dump or relay coil collapse without degradation |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard SMT reflow without baking - reduces manufacturing overhead |
| AEC-Q101 qualification path | Enables direct use in automotive powertrain and chassis modules when ordered as SM6T33CAHE3_B/I |
| Low inductance SMB package | Minimizes voltage overshoot during nanosecond-scale transients - critical for CAN FD and LIN bus protection |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) in engine control units against ISO 7637-2 pulse 1/2a/5a. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge current before reaching downstream ASIC. Use Value: Limits transient voltage to ≤45.7 V, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs while maintaining signal integrity. | Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers exposed to field wiring inductive kickback. IC Role / Device Role / Timing Role: Primary front-end surge suppression stage in signal conditioning circuitry, upstream of precision op-amps and ADCs. Use Value: Clamps 1 kV/500 A surges to <46 V within <1 ns, preserving measurement accuracy and avoiding system reset due to overvoltage fault detection. |
| Consumer Appliance Motor Drive Protection | Telecom Base Station DC Power Line Protection |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers connected to microcontroller GPIOs and Hall-effect sensors. IC Role / Device Role / Timing Role: Localized TVS across motor terminals and sensor supply rails to prevent ESD and switching noise coupling into digital logic. Use Value: Absorbs 600 W pulses without derating at ambient up to 85 °C, enabling compact PCB layout without heatsinking. | Use Scenario: Protecting −48 V DC distribution lines feeding RF amplifiers and backhaul radios from lightning-induced surges per IEC 61000-4-5 (10/700 μs). IC Role / Device Role / Timing Role: Secondary-level clamping device in multi-stage protection architecture, following gas discharge tube (GDT) primary stage. Use Value: Provides low-clamp-voltage follow-on protection with 45.7 V VC, ensuring downstream DC-DC converters remain within absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Same SMB package, 600 W rating, but VBR = 36.7–40.6 V and VC = 53.3 V - higher clamping voltage | Less effective for 3.3 V/5 V rail protection where tighter VC margin is required | Select SM6T33CA-E3/5B when clamping below 46 V is mandatory; SMAJ33CA suits higher-voltage interfaces (e.g., 12 V CAN) |
| 1.5KE33CA | Through-hole DO-201 package, same VBR/VC, but PPPM = 1500 W - higher power handling, larger footprint | Not suitable for space-constrained SMT designs; requires wave soldering or hand assembly | Choose SM6T33CA-E3/5B for automated SMT production and board area savings; 1.5KE33CA only if >600 W surge margin is critical and layout permits axial leaded devices |
Compared with SMAJ33CA and 1.5KE33CA, SM6T33CA-E3/5B offers the lowest clamping voltage in an ultra-compact SMB package, making it optimal for modern high-density automotive and industrial PCBs where voltage margin and layout area are simultaneously constrained.
Availability
SM6T33CA-E3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog inputs, consumer appliance motor drives, and telecom DC power line protection requiring stable component supply and full traceability.
Supply support for SM6T33CA-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, power efficiency, and automotive-grade qualification.
The SM6T Series is designed specifically for robust, high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 compliance, low clamping, and SMT manufacturability are essential.
FAQ
What does the "CA" suffix indicate in SM6T33CA-E3/5B?
The "CA" suffix denotes that SM6T33CA-E3/5B is a bidirectional transient voltage suppressor. Unlike unidirectional variants (e.g., SM6T33A), it provides symmetrical clamping in both polarities - essential for protecting AC-coupled signals, differential buses like CAN, or any circuit where voltage reversals may occur during transients.
Is SM6T33CA-E3/5B AEC-Q101 qualified?
SM6T33CA-E3/5B itself is RoHS-compliant commercial grade. However, the AEC-Q101 qualified version is available as SM6T33CAHE3_B/I (halogen-free, RoHS-compliant, and AEC-Q101 qualified). The "HE3" prefix and "_B/I" revision code identify the automotive-grade variant - SM6T33CA-E3/5B must not be used in automotive safety-critical systems unless replaced with the HE3-suffixed part.
What is the maximum clamping voltage of SM6T33CA-E3/5B and under what test condition?
The maximum clamping voltage of SM6T33CA-E3/5B is 45.7 V, measured at IPPM = 13.1 A using a 10/1000 μs double-exponential surge waveform. This value is guaranteed across temperature and represents the peak voltage imposed on protected circuitry during worst-case transient events defined in IEC 61000-4-5.
Can SM6T33CA-E3/5B replace SM6T33A in a design?
No - SM6T33CA-E3/5B is bidirectional while SM6T33A is unidirectional. Substituting them requires verifying circuit polarity: SM6T33A has a cathode band and conducts only in reverse bias, whereas SM6T33CA-E3/5B conducts identically in both directions. Using SM6T33CA-E3/5B in place of SM6T33A may cause unintended conduction in DC-biased paths.
What is the thermal resistance and how does it affect layout for SM6T33CA-E3/5B?
SM6T33CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W. To maintain TJ ≤ 150 °C at full 5.0 W steady-state dissipation, the PCB must provide ≥5.0 mm × 5.0 mm copper pad area per terminal - as specified in the Vishay datasheet. Smaller pads increase thermal impedance and risk premature thermal runaway during repeated surges.
SM6T33CA-E3/5B 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-E3/5B FAQ
1.How can I place an order for SM6T33CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33CA-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 SM6T33CA-E3/5B reliable?
The price and inventory of SM6T33CA-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 SM6T33CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SM6T33CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33CA-E3/5B?
SM6T33CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33CA-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 SM6T33CA-E3/5B?
For technical support, including SM6T33CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33CA-E3/5B requirements.
6.How does Aetrix verify that SM6T33CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T33CA-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 SM6T33CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SM6T33CA-E3/5B?
All SM6T33CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33CA-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 SM6T33CA-E3/5B part is unused and in its original packaging.
Return procedure for SM6T33CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33CA-E3/5B Tags
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Diodes Incorporated
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