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Vishay General Semiconductor - Diodes Division SM6T33AHE3/52
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- Part No.:
- SM6T33AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33AHE3/52.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,208
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Product details
Overview
SM6T33AHE3/52 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping ESD and surge transients on power/signal lines. It features 33 V standoff voltage (VWM = 28.2 V), 31.4–34.7 V breakdown (VBR at 1 mA), 45.7 V max clamping voltage at 13.1 A (10/1000 μs), 600 W peak pulse power, and AEC-Q101 qualification for automotive electronics protection.
For engineers reviewing the SM6T33AHE3/52 datasheet, SM6T33AHE3/52 pinout, SM6T33AHE3/52 application, or SM6T33AHE3/52 equivalent, key selection factors include clamping voltage margin vs. protected IC's absolute maximum rating, IPPM derating above 25 °C, thermal resistance (RθJA = 100 °C/W), and AEC-Q101 compliance status for automotive-grade deployment.
Technical Context
The SM6T33AHE3/52 operates as a unidirectional avalanche diode with cathode-band polarity marking, optimized for fast response to sub-microsecond transients. Its glass-passivated junction ensures stable VBR and low leakage (<1 μA at 28.2 V), while low-inductance SMB package supports high-frequency surge suppression without parasitic resonance.
It delivers 600 W peak pulse power under standardized 10/1000 μs waveform per Fig. 1, with clamping performance validated at TJ = 25 °C on 5.0 mm × 5.0 mm copper pads. Thermal derating begins above 25 °C per Fig. 2, and junction temperature must remain ≤150 °C during operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.2 V - Maximum reverse working voltage before conduction; sets upper limit for normal circuit operation without leakage-induced stress. |
| VBR (min/max) | 31.4 V / 34.7 V at 1 mA - Confirmed breakdown range ensures predictable turn-on across production lot; critical for margining against system overvoltage thresholds. |
| VC @ IPPM | 45.7 V at 13.1 A (10/1000 μs) - Clamping voltage defines worst-case stress imposed on downstream ICs during surge events. |
| PPPM | 600 W - Peak pulse power handling capacity determines survivability against IEC 61000-4-5 Level 4 (4 kV) surges with proper PCB layout. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance governs allowable power dissipation in still air; requires thermal pad design for sustained duty cycles. |
| TJ max | 150 °C - Maximum junction temperature limits continuous operation in high-ambient environments like engine compartments or industrial enclosures. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE exceeds VBR. |
| Anode (unmarked end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 surge events up to 4 kV without degradation under standard mounting conditions. |
| Glass passivated chip junction | Ensures stable VBR and <1 μA leakage at VWM, minimizing standby power loss and false triggering in battery-powered systems. |
| AEC-Q101 qualification | Validates reliability for automotive applications including infotainment, ADAS sensors, and body control modules operating at -40 °C to +125 °C ambient. |
| Low inductance SMB package | Reduces voltage overshoot during fast-rising transients (e.g., ESD >1 kV/ns), improving clamping fidelity on high-speed signal lines. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator switching transients in passenger vehicles. IC Role / Device Role: Unidirectional TVS placed between power rail and chassis ground to clamp spikes up to ±100 V. Use Value: With VC = 45.7 V, it holds downstream DC-DC converters and microcontrollers below their 48 V absolute maximum rating during ISO 7637-2 Pulse 5a events. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules in factory automation. IC Role / Device Role: TVS mounted at sensor connector to absorb induced surges from nearby motor drives or relay coils. Use Value: 600 W pulse rating and 13.1 A IPPM ensure survival against repetitive 1 kV/500 A surges per IEC 61000-4-4, extending sensor lifetime in noisy EMI environments. |
| Consumer USB Power Delivery Protection | Telecom Base Station DC Input Protection |
Use Scenario: Guarding USB-C PD port input stages against hot-plug transients and cable ESD in portable docking stations. IC Role / Device Role: Unidirectional clamping device on VBUS line, positioned upstream of buck converter and load switch. Use Value: Low 1 μA leakage at 28.2 V prevents quiescent current drain in sleep mode, while 45.7 V clamping protects 5 V–20 V PD negotiation logic. | Use Scenario: Front-end surge suppression on -48 V DC telecom rectifier outputs feeding baseband units and RF amplifiers. IC Role / Device Role: TVS installed between -48 V rail and return, rated for bidirectional capability via companion CA variant if needed. Use Value: RθJA = 100 °C/W and TJ max = 150 °C allow reliable operation in sealed outdoor cabinets where ambient reaches 70 °C. |
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-E3/52 | Same VWM/VBR/VC specs but lower PPPM = 400 W; SMA package (DO-214AC), higher RθJA = 130 °C/W. | Not AEC-Q101 qualified; suitable for commercial-grade consumer/industrial use only. | Select when cost sensitivity outweighs automotive qualification and 400 W pulse power suffices for IEC 61000-4-5 Level 2. |
| SMCJ33AHE3/52 | Higher PPPM = 1500 W; larger SMC (DO-214AB) package; same VWM/VBR/VC; AEC-Q101 qualified. | Greater physical footprint and thermal mass; better suited for high-energy surges in power supply inputs. | Choose when protecting 24 V/48 V industrial power rails subject to repeated lightning-induced surges exceeding 600 W capability. |
Compared with SMAJ33A-E3/52, SM6T33AHE3/52 offers 50 % higher surge power and automotive qualification in a similarly compact SMB footprint; versus SMCJ33AHE3/52, it trades 2.5× pulse power for 30 % smaller board area and lower assembly cost-ideal for space-constrained automotive modules.
Availability
SM6T33AHE3/52 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, consumer USB power delivery systems, and telecom DC input protection requiring stable component supply and AEC-Q101 compliance.
Supply support for SM6T33AHE3/52 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, efficiency, and application-specific optimization.
The SM6T Series is engineered for high-reliability transient suppression in automotive, industrial, and communications infrastructure-designed to meet stringent AEC-Q101, IEC 61000-4-2/4/5, and UL 94 V-0 requirements.
FAQ
What is the clamping voltage of SM6T33AHE3/52 at its rated peak pulse current?
The SM6T33AHE3/52 has a maximum clamping voltage (VC) of 45.7 V at 13.1 A peak pulse current under the standardized 10/1000 μs waveform. This value is measured with the device mounted on 5.0 mm × 5.0 mm copper pads per JEDEC standards and defines the upper voltage stress imposed on protected circuitry during surge events. The SM6T33AHE3/52 maintains this clamping performance across its qualified operating temperature range.
Is SM6T33AHE3/52 suitable for automotive applications?
Yes, SM6T33AHE3/52 is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It meets requirements for temperature cycling, humidity testing, and mechanical shock relevant to engine control units, body electronics, and ADAS sensor modules. The SM6T33AHE3/52 operates reliably from -65 °C to +150 °C junction temperature and is rated for continuous use in under-hood environments up to 125 °C ambient.
What is the standoff voltage (VWM) of SM6T33AHE3/52 and how does it relate to system design?
The SM6T33AHE3/52 has a standoff voltage (VWM) of 28.2 V, meaning it remains non-conductive up to this reverse voltage during normal operation. Designers must ensure that the maximum steady-state voltage on the protected line-including ripple, tolerance, and temperature drift-stays below 28.2 V to prevent leakage-induced power loss or thermal runaway. The SM6T33AHE3/52 provides 3.3 V margin above a nominal 24 V automotive rail, enabling safe operation during cold-crank conditions.
How does the SMB package of SM6T33AHE3/52 affect PCB layout and thermal performance?
The SMB (DO-214AA) package of SM6T33AHE3/52 measures 3.94 mm × 2.20 mm × 1.52 mm and requires minimum 5.0 mm × 5.0 mm copper pads per terminal for rated 600 W pulse handling. Its RθJA of 100 °C/W assumes still-air conditions; thermal relief traces or internal planes must be used to manage junction temperature during repetitive surges. The SM6T33AHE3/52's low-profile design supports automated placement and fits dense layouts typical in automotive ECUs.
What is the difference between SM6T33AHE3/52 and SM6T33CAHE3/52?
The SM6T33AHE3/52 is unidirectional, with cathode marked by a band and intended for DC line protection where polarity is fixed. The SM6T33CAHE3/52 is bidirectional-no polarity marking-and provides symmetric clamping for AC lines or differential signals. Both share identical VBR, VC, and PPPM, but the SM6T33AHE3/52 exhibits forward conduction behavior below VBR, whereas the SM6T33CAHE3/52 clamps equally in both directions above its breakdown threshold.
SM6T33AHE3/52 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:
- 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 (SMBJ)
SM6T33AHE3/52 FAQ
1.How can I place an order for SM6T33AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33AHE3/52 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 SM6T33AHE3/52 reliable?
The price and inventory of SM6T33AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T33AHE3/52 is usually 5 days.
3.What payment methods are accepted for SM6T33AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33AHE3/52?
SM6T33AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33AHE3/52 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 SM6T33AHE3/52?
For technical support, including SM6T33AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33AHE3/52 requirements.
6.How does Aetrix verify that SM6T33AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T33AHE3/52 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 SM6T33AHE3/52 meets industry standards.
7.What is the process for return or replacement of SM6T33AHE3/52?
All SM6T33AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33AHE3/52, 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 SM6T33AHE3/52 part is unused and in its original packaging.
Return procedure for SM6T33AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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