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Vishay General Semiconductor - Diodes Division SM6T33AHE3_B/I
- Part No.:
- SM6T33AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33AHE3_B/I.pdf
- Description:
- 600W,33V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,991
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Product details
Overview
SM6T33AHE3_B/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, with 33 V breakdown voltage (VBR = 31.4–34.7 V), 45.7 V max clamping voltage at 13.1 A, 600 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive use. It protects MOSFETs and sensor signal lines against inductive switching transients.
For engineers reviewing the SM6T33AHE3_B/I datasheet, SM6T33AHE3_B/I pinout, SM6T33AHE3_B/I application, or SM6T33AHE3_B/I equivalent, key selection criteria include unidirectional polarity, 28.2 V stand-off voltage, 1.0 μA max reverse leakage, 100 °C/W junction-to-ambient thermal resistance, and RoHS-compliant matte tin-plated leads solderable per J-STD-002.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuit nodes, conducting only when reverse voltage exceeds VWM = 28.2 V and fully clamping at VC = 45.7 V under 13.1 A peak pulse current. Its low-inductance SMB package and glass-passivated junction support fast response to ESD and surge events.
Designed for automotive-grade reliability, SM6T33AHE3_B/I meets AEC-Q101 stress testing requirements and is rated for TJ = –65 °C to +150 °C operation. It delivers 600 W peak pulse power with 10/1000 μs waveform and derates linearly above 25 °C ambient per Fig. 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V - Ensures reliable conduction onset within defined tolerance band at 1.0 mA test current |
| VWM | 28.2 V - Maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | 45.7 V @ 13.1 A - Clamped voltage during 600 W transient, limiting downstream stress on protected ICs |
| PPPM | 600 W - Peak surge handling capability with standard 10/1000 μs waveform per IEC 61000-4-5 |
| TJ range | –65 °C to +150 °C - Enables deployment in under-hood automotive environments and industrial enclosures |
| RθJA | 100 °C/W - Thermal resistance defines maximum power dissipation on standard 0.2" × 0.2" copper pads |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTOL, TC, AC, and ESD |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connects to protected line; conducts surge current to ground when VREV > VWM |
| Anode (unmarked end) | Reference/ground return path | Typically tied to system ground plane; completes clamping loop during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Handles high-energy transients from load dump or inductive kick without failure |
| Glass passivated chip junction | Ensures stable VBR and low leakage across temperature and lifetime |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time) |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Signal Lines |
|---|---|
Use Scenario: Protects microcontroller GPIO and CAN transceiver inputs from load-dump spikes and alternator ripple in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and chassis ground. Use Value: Limits transient voltage to ≤45.7 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. | Use Scenario: Shields encoder feedback lines and analog sensor outputs from commutation noise in variable-frequency drives. IC Role / Device Role / Timing Role: Standoff protection element on differential RS-422 or single-ended analog paths. Use Value: Maintains signal integrity by clamping surges before they distort timing edges or saturate op-amp inputs. |
| Automotive Camera Module Power Input | Consumer Appliance Microcontroller Reset Line |
Use Scenario: Guards 5 V power rail of rear-view camera modules against ISO 7637-2 Pulse 5a/b transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input rail upstream of LDO regulator. Use Value: Prevents brownout or reset corruption during cold-crank and jump-start conditions with <100 ns response. | Use Scenario: Secures microcontroller reset pin against ESD and board-level coupling in washing machine control boards. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) standoff protector on active-low reset line referenced to VDD. Use Value: Avoids false resets by holding VWM = 28.2 V well above nominal 3.3 V logic levels while blocking noise below threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5B | Same VBR range (31.4–34.7 V), but lower PPPM = 400 W and higher VC = 53.3 V @ 7.5 A; SMA package (DO-214AC) | Not AEC-Q101 qualified; suitable for commercial-grade consumer or industrial equipment only | Select when cost sensitivity outweighs automotive qualification and 600 W surge margin |
| 1.5SMC33A | Higher PPPM = 1500 W, same VBR, but larger SMC (DO-214AB) package and non-AEC-Q101; VC = 53.3 V @ 28.2 A | Used where PCB space allows larger footprint and higher surge immunity is required beyond ISO 16750-2 Class IV | Choose for heavy-duty industrial motor controls or telecom power entry where 1.5 kW rating is mandated |
Compared with SMAJ33A-E3/5B and 1.5SMC33A, SM6T33AHE3_B/I uniquely balances AEC-Q101 compliance, 600 W capability, and SMB footprint-making it optimal for space-constrained automotive modules requiring validated reliability without layout redesign.
Availability
SM6T33AHE3_B/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial motor drives, consumer appliance controllers, and camera module designs requiring stable component supply and long-term lifecycle assurance.
Supply support for SM6T33AHE3_B/I 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, efficiency, and application-specific validation.
The SM6T Series is designed specifically for robust transient voltage suppression in automotive and industrial environments, combining AEC-Q101 qualification, low-clamp performance, and surface-mount scalability.
FAQ
What is the clamping voltage of SM6T33AHE3_B/I under peak pulse conditions?
The SM6T33AHE3_B/I has a maximum clamping voltage (VC) of 45.7 V when subjected to its rated peak pulse current of 13.1 A using a 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88385 and ensures downstream components see limited overvoltage during surge events. The SM6T33AHE3_B/I maintains this clamping performance across its full operating temperature range.
Is SM6T33AHE3_B/I suitable for automotive applications?
Yes, SM6T33AHE3_B/I is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It meets stress test requirements including high-temperature operating life, temperature cycling, and ESD robustness. The SM6T33AHE3_B/I is commonly deployed in engine control units, ADAS camera modules, and body electronics where reliability under harsh environmental conditions is mandatory.
What does the "_B/I" suffix mean in SM6T33AHE3_B/I?
The "_B/I" suffix in SM6T33AHE3_B/I indicates packaging configuration: "B" denotes the revision code (Revision B per Vishay's ordering nomenclature), and "I" specifies 13-inch diameter plastic tape-and-reel delivery containing 3200 units. This format supports high-volume automated assembly and is traceable per Vishay's material categorization standards.
How does SM6T33AHE3_B/I differ from bidirectional variants like SM6T33CA?
SM6T33AHE3_B/I is unidirectional, with cathode marked by a band and intended for DC-biased lines where reverse conduction must be blocked except during transients. In contrast, SM6T33CA is bidirectional, lacks polarity marking, and clamps symmetrically in both directions-used in AC-coupled or floating signal paths. The SM6T33AHE3_B/I offers tighter leakage control (1.0 μA at 28.2 V) versus bidirectional versions which double ID limit per note (3) in the datasheet.
What is the thermal resistance of SM6T33AHE3_B/I, and how does it affect layout?
The SM6T33AHE3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal PCB copper; increasing pad area or adding thermal vias reduces RθJA. For sustained power dissipation, the SM6T33AHE3_B/I requires careful thermal design to avoid exceeding TJ = 150 °C under worst-case surge repetition.
SM6T33AHE3_B/I 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T33AHE3_B/I FAQ
1.How can I place an order for SM6T33AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33AHE3_B/I 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 SM6T33AHE3_B/I reliable?
The price and inventory of SM6T33AHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T33AHE3_B/I is usually 5 days.
3.What payment methods are accepted for SM6T33AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33AHE3_B/I?
SM6T33AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33AHE3_B/I 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 SM6T33AHE3_B/I?
For technical support, including SM6T33AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33AHE3_B/I requirements.
6.How does Aetrix verify that SM6T33AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T33AHE3_B/I 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 SM6T33AHE3_B/I meets industry standards.
7.What is the process for return or replacement of SM6T33AHE3_B/I?
All SM6T33AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33AHE3_B/I, 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 SM6T33AHE3_B/I part is unused and in its original packaging.
Return procedure for SM6T33AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33AHE3_B/I Tags
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