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Vishay General Semiconductor - Diodes Division SM6T33AHM3/I
- Part No.:
- SM6T33AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33AHM3/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,291
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Product details
Overview
SM6T33AHM3/I 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 systems.
For engineers reviewing the SM6T33AHM3/I datasheet, SM6T33AHM3/I pinout, SM6T33AHM3/I application, or SM6T33AHM3/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 100 °C/W), and junction temperature range (–65 to +150 °C).
Technical Context
This TVS diode operates as a fast-acting shunt clamp during overvoltage events, leveraging a glass-passivated silicon junction to achieve low leakage (<1 μA at VWM) and low clamping ratio (VC/VBR ≈ 1.45). Its unidirectional configuration enables integration into DC-biased circuits where reverse conduction must be blocked until clamping threshold is exceeded.
The device meets J-STD-020 MSL Level 1 (peak reflow ≤260 °C), supports automated SMT placement, and delivers stable performance across –65 °C to +150 °C operating junction temperature. Its SMB package provides low inductance and high surge robustness, validated for 100 A IFSM (10 ms half-sine) and 600 W PPPM (10/1000 μs).
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 under controlled test conditions |
| VWM | 28.2 V - maximum continuous reverse voltage before significant leakage begins |
| 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 |
| IFSM | 100 A - non-repetitive forward surge rating for inrush or fault-current handling |
| TJ Range | –65 °C to +150 °C - ensures operation in under-hood automotive and industrial ambient extremes |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, critical for PCB pad layout design |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse bias reference | Connected to lower-potential side of protected line; defines unidirectional conduction path |
| Cathode | Clamping output / surge return path | Banded end; connects to ground or common rail to shunt transient energy away from load |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and low leakage (<1 μA at VWM) over lifetime and temperature |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress |
| Low-inductance SMB package | Minimizes voltage overshoot during fast transients (e.g., ISO 7637-2 pulses) |
| Halogen-free & RoHS-compliant | Meets automotive and industrial environmental compliance requirements (JESD201 Class 2 whisker resistance) |
| 600 W 10/1000 μs rating | Supports protection against severe load-dump and inductive-switching surges in 12 V/24 V systems |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump transients up to 35 V and ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power rail and chassis ground to limit voltage excursion during alternator field decay. Use Value: Clamps peak voltage to ≤45.7 V at 13.1 A, preventing damage to downstream LDOs and microcontrollers rated for 36 V absolute max. | Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance shunt protector on 0–5 V or 4–20 mA signal paths, mounted adjacent to connector interface. Use Value: Sub-1 μA leakage at 28.2 V ensures minimal signal offset; fast response (<1 ns) prevents latch-up in precision ADC front-ends. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feeds |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters subjected to lightning-induced surges on mains input. IC Role / Device Role / Timing Role: Standoff-rated TVS on 5–24 V DC output rails to absorb coupled transients from primary-side failures or external coupling. Use Value: 28.2 V VWM allows safe operation across full adapter tolerance band; 600 W rating handles repetitive surge stress without degradation. | Use Scenario: DC feed protection in PoE-powered base stations and remote radio units exposed to induced surges on long outdoor runs. IC Role / Device Role / Timing Role: Unidirectional clamp on +48 V DC supply line upstream of DC/DC converters and PMICs. Use Value: Withstands 100 A IFSM for accidental short-circuit events; AEC-Q101 qualification adds confidence in extended-field deployment reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5B | Same SMB package, 33 V VBR, but only commercial-grade (not AEC-Q101 qualified); RθJA = 110 °C/W | Lacks automotive qualification; suitable for consumer/industrial use where AEC-Q101 not mandated | Select when cost sensitivity outweighs automotive reliability requirements and thermal margin permits higher RθJA |
| SMCJ33A-HM3 | Higher 1500 W PPPM rating, same VBR/VWM, but larger SMC (DO-214AB) package (7.11 mm x 6.22 mm vs. SMB's 4.57 mm x 3.94 mm) | Requires PCB layout change; preferred where surge threat exceeds 600 W (e.g., heavy-duty industrial motor drives) | Choose when system-level surge testing requires >600 W headroom and board space allows SMC footprint |
Compared with SMAJ33A-E3/5B and SMCJ33A-HM3, SM6T33AHM3/I offers the optimal balance of AEC-Q101 qualification, SMB footprint compatibility, and 600 W surge capacity - making it ideal for space-constrained automotive modules requiring certified reliability without package redesign.
Availability
SM6T33AHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom DC power feeds requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for SM6T33AHM3/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SM6T Series was developed to deliver high-power, surface-mount transient suppression for automotive and industrial environments - prioritizing AEC-Q101 qualification, low-profile packaging, and consistent clamping performance under thermal stress.
FAQ
What is the polarity configuration of SM6T33AHM3/I?
The SM6T33AHM3/I is a unidirectional transient voltage suppressor diode. Its cathode is marked by a band on the SMB package body, and it conducts only in reverse bias during overvoltage events. This configuration blocks normal forward current while providing low-impedance shunt clamping when the reverse voltage exceeds the breakdown threshold - essential for protecting DC-powered circuits like automotive ECUs and industrial sensors.
Is SM6T33AHM3/I qualified for automotive applications?
Yes, SM6T33AHM3/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's official SM6T series datasheet (Doc. #88385, Rev. 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, validating its suitability for under-hood and chassis-mounted automotive electronics where reliability under thermal and mechanical stress is critical.
What is the maximum clamping voltage of SM6T33AHM3/I at rated surge current?
The maximum clamping voltage (VC) of SM6T33AHM3/I is 45.7 V when subjected to a 10/1000 μs waveform peak pulse current (IPPM) of 13.1 A. This value is measured per standard test conditions (TA = 25 °C, mounted on 5.0 mm × 5.0 mm copper pads) and represents the highest voltage the protected circuit will experience during a defined transient event - a key parameter for ensuring downstream components remain within their absolute maximum ratings.
Does SM6T33AHM3/I meet RoHS and halogen-free requirements?
Yes, SM6T33AHM3/I carries the HM3 suffix, indicating it is both RoHS-compliant and halogen-free per Vishay's material categorization standards (see Doc. #99912). Its matte tin-plated terminals comply with J-STD-002 and JESD22-B102 solderability requirements, and it passes JESD201 Class 2 whisker testing - fulfilling environmental and process compatibility mandates for modern automotive and industrial manufacturing.
What is the thermal resistance of SM6T33AHM3/I, and how does it affect PCB layout?
The typical junction-to-ambient thermal resistance (RθJA) of SM6T33AHM3/I is 100 °C/W under standard mounting conditions (0.2" × 0.2" copper pads per terminal). This value directly impacts PCB thermal design: to maintain TJ ≤150 °C at full 5.0 W steady-state dissipation, designers must ensure adequate copper area and minimize ambient temperature rise - underscoring the need for verified pad layouts per Vishay's recommended dimensions in the SM6T datasheet.
SM6T33AHM3/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:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T33AHM3/I FAQ
1.How can I place an order for SM6T33AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33AHM3/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 SM6T33AHM3/I reliable?
The price and inventory of SM6T33AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T33AHM3/I is usually 5 days.
3.What payment methods are accepted for SM6T33AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33AHM3/I?
SM6T33AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33AHM3/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 SM6T33AHM3/I?
For technical support, including SM6T33AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33AHM3/I requirements.
6.How does Aetrix verify that SM6T33AHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6T33AHM3/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 SM6T33AHM3/I meets industry standards.
7.What is the process for return or replacement of SM6T33AHM3/I?
All SM6T33AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33AHM3/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 SM6T33AHM3/I part is unused and in its original packaging.
Return procedure for SM6T33AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33AHM3/I Tags
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