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Vishay General Semiconductor - Diodes Division SM6T33A-E3/5B
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- Part No.:
- SM6T33A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33A-E3/5B.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,466
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Product details
Overview
SM6T33A-E3/5B 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 max 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 power supplies.
For engineers reviewing the SM6T33A-E3/5B datasheet, SM6T33A-E3/5B pinout, SM6T33A-E3/5B application, or SM6T33A-E3/5B equivalent, key selection criteria include unidirectional polarity, SMB package thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification eligibility (via HE3 suffix), low leakage (<1 μA at VWM), and compliance with J-STD-020 MSL level 1.
Technical Context
The SM6T33A-E3/5B operates as a unidirectional clamping device with cathode-banded polarity, leveraging glass-passivated junction technology for stable breakdown and low inductance. Its 10/1000 μs pulse response enables robust protection against inductive switching surges and ESD events up to 600 W without thermal runaway under derated conditions above 25 °C.
Designed for surface-mount automated placement, it uses matte tin-plated leads solderable per J-STD-002 and JESD 22-B102, with UL 94 V-0 molding compound and JESD 201 class 2 whisker resistance. The SMB (DO-214AA) package supports 0.2" × 0.2" copper pad mounting per JEDEC standards for optimal thermal dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1.0 mA - defines precise clamping onset threshold for overvoltage detection |
| 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) - actual clamped voltage seen by protected circuit during surge |
| PPPM | 600 W - peak transient energy absorption capability without failure |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance determines safe power derating above 25 °C |
| TJ max | +150 °C - maximum allowable junction temperature for reliable long-term operation |
| IFSM | 100 A - peak forward surge current tolerance for 10 ms half-sine wave (unidirectional only) |
Pinout & Package
SMB (DO-214AA) surface-mount package with cathode band marking; dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); RoHS-compliant matte tin-plated leads; UL 94 V-0 flammability rating; MSL level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse voltage reference node | Connected to lower-potential side of protected line; defines unidirectional conduction path |
| Cathode (banded end) | Clamping output / surge return path | Connected to higher-potential rail (e.g., VCC or signal line); sinks transient current to ground or rail |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables single-device protection against high-energy transients in 12 V/24 V automotive and industrial power rails |
| Glass passivated chip junction | Ensures stable VBR tolerance and low parameter drift across temperature and lifetime |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a) |
| MSL level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture-related popcorning or delamination |
| AEC-Q101 qualification path (HE3/HM3 variants) | Enables drop-in use in automotive ECUs when ordered with HE3 suffix and appropriate revision code |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs from load dump and alternator ripple in body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between VBAT and GND, triggered only during positive overvoltage events. Use Value: Limits transient voltage to ≤45.7 V during 13.1 A surges, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Standby-mode shunt protector with <1 μA leakage at 28.2 V, activated only during >31.4 V transients. Use Value: Maintains signal integrity below 28.2 V while clamping sub-100 ns ESD pulses to safe levels without affecting loop accuracy. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feed Protection |
Use Scenario: Safeguarding primary-side rectifier outputs in AC/DC adapters against lightning-induced surges on mains input. IC Role / Device Role / Timing Role: Secondary-stage TVS after bridge rectifier, absorbing residual differential-mode transients before bulk capacitor. Use Value: Withstands 600 W pulses without degradation, extending adapter MTBF in regions with unstable grid infrastructure. | Use Scenario: Protecting -48 V DC feed lines in telecom base station remote radio units from induced surges on long outdoor cable runs. IC Role / Device Role / Timing Role: Reverse-biased clamp referenced to -48 V rail, conducting only during positive excursions exceeding 28.2 V above rail. Use Value: Clamps to 45.7 V relative to rail, preserving -48 V system integrity and preventing damage to PoE controllers and FET drivers. |
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 rated for 400 W PPPM (vs. 600 W) | Limited to lower-energy transients; unsuitable for automotive load dump per ISO 16750-2 | Select SM6T33A-E3/5B where 600 W surge margin is required for industrial or automotive Grade 3/4 environments |
| 1.5SMC33A | Higher-power SMC package (same VBR range), 1500 W PPPM, larger footprint (7.11 mm × 6.22 mm) | Requires PCB layout change; better suited for primary-side AC line protection | Choose SM6T33A-E3/5B for space-constrained secondary-side 12–24 V rail protection where SMB fit is mandatory |
Compared with SMAJ33A and 1.5SMC33A, the SM6T33A-E3/5B delivers optimal balance of 600 W surge capacity, SMB footprint compatibility, and production-ready RoHS compliance - making it preferred for cost-sensitive, high-volume automotive and industrial PCBs requiring validated transient immunity without redesign.
Availability
SM6T33A-E3/5B is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and telecom power feed circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6T33A-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, thermal performance, and automotive-grade qualification.
The SM6T Series is engineered specifically for robust transient suppression in harsh environments - targeting 12 V/24 V/48 V power distribution networks where compact size, high surge rating, and AEC-Q101 readiness are critical.
FAQ
What is the polarity configuration of SM6T33A-E3/5B?
The SM6T33A-E3/5B is a unidirectional transient voltage suppressor diode, with the cathode identified by a band on the SMB package body. It conducts only during positive voltage excursions relative to its anode terminal, making it suitable for DC rail protection where polarity is fixed and reverse conduction must be blocked.
Does SM6T33A-E3/5B meet automotive qualification standards?
The SM6T33A-E3/5B itself is commercial-grade (RoHS-compliant E3 suffix), but Vishay offers AEC-Q101 qualified versions under ordering codes like SM6T33AHE3_B/I. For automotive use, specify the HE3 or HM3 suffix with appropriate revision code - the SM6T33A-E3/5B is not AEC-Q101 qualified out-of-box.
What is the maximum clamping voltage of SM6T33A-E3/5B under standard test conditions?
The SM6T33A-E3/5B has a maximum clamping voltage (VC) of 45.7 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 13.1 A. This value is measured per Figure 1 in Vishay document 88385 and defines the upper voltage limit imposed on protected circuitry during surge events.
Can SM6T33A-E3/5B be used in bidirectional applications?
No - the SM6T33A-E3/5B is strictly unidirectional. For bidirectional transient suppression, Vishay specifies CA-suffixed variants such as SM6T33CA. Using SM6T33A-E3/5B in bidirectional configurations risks failure during negative-going transients due to lack of reverse breakdown specification.
What is the thermal resistance and how does it affect SM6T33A-E3/5B layout?
The SM6T33A-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads. To maintain safe operation at elevated ambient temperatures, PCB layout must follow Vishay's recommended pad dimensions and avoid excessive trace length or isolation that increases thermal impedance beyond this baseline.
SM6T33A-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:
- 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-E3/5B FAQ
1.How can I place an order for SM6T33A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33A-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 SM6T33A-E3/5B reliable?
The price and inventory of SM6T33A-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 SM6T33A-E3/5B is usually 5 days.
3.What payment methods are accepted for SM6T33A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33A-E3/5B?
SM6T33A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33A-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 SM6T33A-E3/5B?
For technical support, including SM6T33A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33A-E3/5B requirements.
6.How does Aetrix verify that SM6T33A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T33A-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 SM6T33A-E3/5B meets industry standards.
7.What is the process for return or replacement of SM6T33A-E3/5B?
All SM6T33A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33A-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 SM6T33A-E3/5B part is unused and in its original packaging.
Return procedure for SM6T33A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33A-E3/5B Tags
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