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Vishay General Semiconductor - Diodes Division SM6T33A-E3/52
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- Part No.:
- SM6T33A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33A-E3/52.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,631
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Product details
Overview
SM6T33A-E3/52 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 33 V breakdown voltage (VBR = 31.4–34.7 V at 1 mA), 28.2 V stand-off voltage (VWM), 45.7 V maximum clamping voltage (VC) at 13.1 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SM6T33A-E3/52 datasheet, SM6T33A-E3/52 pinout, SM6T33A-E3/52 application, or SM6T33A-E3/52 equivalent, key selection criteria include unidirectional polarity, SMB package compatibility, clamping performance under 13.1 A surge, thermal resistance (RθJA = 100 °C/W), and AEC-Q101 qualification availability via HE3 suffix variants.
Technical Context
The SM6T33A-E3/52 operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast response to ESD and inductive switching transients. Its clamping action begins above 28.2 V reverse stand-off voltage and fully engages by 45.7 V at 13.1 A, delivering low-inductance protection without series impedance.
Rated for -65 °C to +150 °C junction temperature, it supports automated SMT placement on 5.0 mm × 5.0 mm copper pads and meets J-STD-020 MSL Level 1 (260 °C peak reflow). The cathode band denotes polarity; no marking is used for bidirectional versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1 mA - defines precise avalanche onset range for reliable overvoltage triggering |
| VWM | 28.2 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 45.7 V at 13.1 A (10/1000 μs) - clamping voltage seen by protected circuit during worst-case surge |
| PPPM | 600 W - peak transient power handling capability under standardized 10/1000 μs waveform |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, critical for derating above 25 °C ambient |
| IFSM | 100 A - non-repetitive forward surge rating (10 ms half-sine), relevant for fault-current limiting |
| TJ max | +150 °C - maximum allowable junction temperature, enabling operation in under-hood automotive environments |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant, UL 94 V-0 molding compound. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VRM exceeded |
| Anode | Reference/ground return | Typically tied to system ground or low-impedance return path for clamping loop integrity |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Load Dump and IEC 61000-4-5 surge events in 12 V systems |
| Glass passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), preserving clamping fidelity |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without preconditioning or special handling |
| AEC-Q101 qualification option | Available in HE3 suffix variant for automotive-grade deployment in engine control, body electronics, and ADAS sensors |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppresses load dump transients on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground to clamp surges up to 600 W. Use Value: Limits voltage to ≤45.7 V during 13.1 A transients, preventing damage to downstream DC-DC converters and microcontrollers in SM6T33A-E3/52-equipped modules. | Use Scenario: Shields analog output lines of pressure/temperature sensors in PLC I/O modules from ESD and field-wiring induced spikes. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across signal and reference lines to absorb ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal integrity below 1 μA leakage at 28.2 V, ensuring <0.1% gain error in 4–20 mA loops using SM6T33A-E3/52. |
| Consumer Power Adapter Input Protection | MOSFET Gate Driver Transient Suppression |
Use Scenario: Protects primary-side controller ICs in AC-DC adapters from line surge and lightning-induced transients. IC Role / Device Role / Timing Role: Unidirectional clamping device placed across bulk capacitor input to divert surge energy away from PWM IC. Use Value: Withstands 100 A non-repetitive forward surge (IFSM), enabling survival of high-energy 10/1000 μs events without degradation in SM6T33A-E3/52-based designs. | Use Scenario: Prevents gate oxide rupture in high-side N-channel MOSFETs driven by isolated gate drivers in motor inverters. IC Role / Device Role / Timing Role: Low-inductance TVS mounted directly at MOSFET source-to-gate terminals to clamp Miller-induced spikes. Use Value: Achieves sub-50 ns response with 45.7 V clamping ceiling, keeping VGS within ±20 V safe operating area for 600 V MOSFETs using SM6T33A-E3/52. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Same SMB package, identical VWM/VBR/VC specs, but lower PPPM = 400 W and higher RθJA = 125 °C/W | Limited to lower-energy transients; not suitable for ISO 7637-2 Pulse 5a load dump | Select SMAJ33A only for cost-sensitive consumer applications where 400 W rating suffices and thermal margin allows |
| 1.5SMC33A | Higher PPPM = 1500 W, larger SMC (DO-214AB) package (7.11 mm × 6.22 mm), same VBR range | Requires PCB layout change; better for high-reliability industrial power supplies needing >600 W headroom | Choose 1.5SMC33A when surge energy exceeds 600 W or board space permits larger footprint |
Compared with SMAJ33A and 1.5SMC33A, SM6T33A-E3/52 delivers optimal balance of 600 W surge capacity, SMB footprint compatibility, and 100 °C/W thermal performance - making it preferred for space-constrained automotive and industrial modules requiring validated AEC-Q101 alternatives.
Availability
SM6T33A-E3/52 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and consumer power adapter designs requiring stable component supply, RoHS compliance, and consistent SMB package sourcing.
Supply support for SM6T33A-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, precision, and automotive qualification.
The SM6T Series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness, repeatable clamping, and AEC-Q101 readiness are mandatory design requirements.
FAQ
What is the maximum clamping voltage of the SM6T33A-E3/52 under standard test conditions?
The SM6T33A-E3/52 has a maximum clamping voltage (VC) of 45.7 V at 13.1 A peak pulse current with a 10/1000 μs waveform. This value is measured per JEDEC standards and represents the upper voltage limit imposed on protected circuitry during surge events. It ensures downstream components like microcontrollers or gate drivers remain within safe operating voltage ranges when SM6T33A-E3/52 is correctly applied in parallel with the line being protected.
Is the SM6T33A-E3/52 suitable for automotive applications?
Yes, the SM6T33A-E3/52 is RoHS-compliant and compatible with AEC-Q101 qualified variants (e.g., SM6T33AHE3_B/H). While the E3/52 suffix itself is commercial grade, its construction - including glass-passivated junction, MSL Level 1 reflow rating, and -65 °C to +150 °C operating range - meets foundational requirements for under-hood and body electronics. For certified automotive use, specify the HE3 suffix version of SM6T33A-E3/52.
How does the SMB package of the SM6T33A-E3/52 affect PCB layout and thermal performance?
The SMB (DO-214AA) package of SM6T33A-E3/52 measures 4.57 mm × 3.94 mm and requires minimum 5.0 mm × 5.0 mm copper pads per terminal for rated power dissipation. Its RθJA of 100 °C/W means thermal derating begins above 25 °C ambient - e.g., at 70 °C ambient, maximum continuous power drops to ~2.5 W. Layout must avoid thermal isolation; SM6T33A-E3/52 relies on pad copper mass for heat spreading.
What is the polarity configuration of the SM6T33A-E3/52 and how is it identified on the device?
The SM6T33A-E3/52 is a unidirectional TVS diode, with polarity indicated by a cathode band at one end of the SMB package. During reverse-biased transient suppression, current flows from cathode to anode into ground. The band corresponds to the cathode terminal - critical for correct orientation in series with protected lines. Bidirectional variants use "CA" suffix (e.g., SM6T33CA) and lack polarity marking.
Does the SM6T33A-E3/52 meet industry standards for surge immunity testing?
Yes, the SM6T33A-E3/52 is characterized for IEC 61000-4-5 (surge immunity) and ISO 7637-2 (automotive transients) compliance when applied per recommended layout. Its 600 W peak pulse rating with 10/1000 μs waveform aligns with Level 3/4 surge tests, and its 100 A IFSM rating supports Load Dump Pulse 5a simulation. Full compliance validation requires system-level testing with SM6T33A-E3/52 integrated into the target PCB stack-up.
SM6T33A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SM6T33A-E3/52 FAQ
1.How can I place an order for SM6T33A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33A-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 SM6T33A-E3/52 reliable?
The price and inventory of SM6T33A-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 SM6T33A-E3/52 is usually 5 days.
3.What payment methods are accepted for SM6T33A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33A-E3/52?
SM6T33A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33A-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 SM6T33A-E3/52?
For technical support, including SM6T33A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33A-E3/52 requirements.
6.How does Aetrix verify that SM6T33A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T33A-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 SM6T33A-E3/52 meets industry standards.
7.What is the process for return or replacement of SM6T33A-E3/52?
All SM6T33A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33A-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 SM6T33A-E3/52 part is unused and in its original packaging.
Return procedure for SM6T33A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33A-E3/52 Tags
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