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Vishay General Semiconductor - Diodes Division SM6T33CAHE3_B/I
- Part No.:
- SM6T33CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33CAHE3_B/I.pdf
- Description:
- 600W,33V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,945
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Product details
Overview
SM6T33CAHE3_B/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping ESD and surge transients on signal/power lines. It features 33 V standoff voltage (VWM), 37.1–41.0 V breakdown (VBR at 1 mA), 600 W peak pulse power (10/1000 μs), and clamps to ≤59 V at 13.1 A. It is AEC-Q101 qualified and used for protecting automotive sensor interfaces and industrial I/O lines.
For engineers reviewing the SM6T33CAHE3_B/I datasheet, SM6T33CAHE3_B/I pinout, SM6T33CAHE3_B/I application, or SM6T33CAHE3_B/I equivalent, key selection criteria include bidirectional clamping capability, 150 °C junction rating, RoHS-compliant AEC-Q101 qualification, low-inductance SMB package, and verified 600 W surge handling per JEDEC-standard waveform.
Technical Context
This TVS diode operates symmetrically in both polarities due to its CA-suffix bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown and low leakage (<1 μA at 28.2 V), while the low-inductance SMB package supports fast transient response.
The device complies with AEC-Q101 stress testing for automotive use and meets J-STD-020 MSL Level 1 (260 °C reflow). Thermal resistance is 100 °C/W junction-to-ambient (on 5 mm × 5 mm pads), and it sustains 100 A non-repetitive forward surge (unidirectional mode only - not applicable here due to bidirectional configuration).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.2 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 37.1 V / 41.0 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | ≤59 V at 13.1 A (10/1000 μs) - clamping voltage limiting downstream circuit stress |
| PPPM | 600 W - peak surge power dissipation capability under standardized transient waveform |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMB (DO-214AA) - surface-mount package with 2.2 mm height, optimized for automated placement and low parasitic inductance |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
SM6T33CAHE3_B/I is housed in an SMB (DO-214AA) surface-mount package with two terminals: anode and cathode. As a bidirectional device, it has no polarity marking; both terminals are functionally symmetric and interchangeable in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Conducts during positive voltage excursions above VBR; forms one side of symmetrical clamping path |
| Cathode | Transient current entry (negative half-cycle) | Conducts during negative voltage excursions below −VBR; completes bidirectional clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), and ungrounded lines without polarity constraints |
| 600 W peak pulse power | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Combination Wave surges up to 4 kV (line-earth) in typical PCB layouts |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage drift over temperature and lifetime, critical for automotive field reliability |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 260 °C peak without preconditioning, reducing manufacturing complexity |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and body electronics modules |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input to limit transients to safe levels. Use Value: Prevents ADC saturation and latch-up by clamping spikes to ≤59 V while maintaining <1 μA leakage at 28.2 V standby. | Use Scenario: Safeguarding 24 V PLC digital input channels against inductive kickback from solenoid/relay switching. IC Role / Device Role / Timing Role: Transient suppressor across input terminals to shunt surge energy before reaching optocoupler or level-shifter IC. Use Value: Absorbs 600 W surges without degradation, preserving signal integrity and extending system MTBF in factory automation settings. |
| Automotive CAN Bus Protection | Consumer Power Adapter Input Stage |
Use Scenario: Guarding high-speed CAN FD transceivers against ESD events and coupled noise on vehicle wiring harnesses. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed across CANH/CANL differential pair near connector. Use Value: Clamps ±30 kV contact ESD (IEC 61000-4-2) while adding <10 pF capacitance - negligible impact on 5 Mbps CAN FD signal integrity. | Use Scenario: Secondary-side surge suppression on 12 V DC output rails of wall-mounted AC/DC adapters for smart home devices. IC Role / Device Role / Timing Role: Final-stage protector downstream of DC-DC converter to prevent overvoltage damage to connected IoT modules. Use Value: Maintains 28.2 V nominal operation while clamping lightning-induced surges to ≤59 V, meeting UL 62368-1 transient immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Same VWM/VBR/VC specs but rated for 400 W PPPM (vs. 600 W); SMA package (larger footprint, higher RθJA) | Limited to lower-energy transients; less suitable for ISO 7637-2 Pulse 5a (load dump) | Select when cost sensitivity outweighs peak surge margin and board space allows larger SMA footprint |
| 1.5KE33CA | Through-hole DO-201 package; same 33 V rating but 1500 W PPPM; higher junction capacitance (~100 pF) | Not suitable for high-speed data lines; better for bulk power rail protection where layout density is low | Choose for legacy through-hole designs or primary-side AC/DC input protection where speed is not critical |
Compared with SMAJ33CA and 1.5KE33CA, SM6T33CAHE3_B/I delivers superior surge robustness in a compact, automotive-qualified surface-mount package - making it optimal for space-constrained, high-reliability signal-line protection where 600 W clamping and AEC-Q101 compliance are mandatory.
Availability
SM6T33CAHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, CAN bus nodes, and consumer power adapter secondary-side protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SM6T33CAHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SM6T Series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where AEC-Q101 qualification, low leakage, and repeatable clamping behavior are essential design requirements.
FAQ
What is the standoff voltage (VWM) specification for SM6T33CAHE3_B/I?
The SM6T33CAHE3_B/I has a maximum reverse standoff voltage (VWM) of 28.2 V, meaning it remains non-conductive up to this DC or RMS voltage level. This value ensures compatibility with 24 V automotive and industrial systems while providing sufficient margin before breakdown at 37.1–41.0 V. The 28.2 V rating is confirmed in Vishay's official SM6T datasheet (Doc. #88385, Rev. 09-Jan-2024) under Electrical Characteristics.
Is SM6T33CAHE3_B/I suitable for automotive applications?
Yes, SM6T33CAHE3_B/I is explicitly AEC-Q101 qualified, as indicated by the "HE3" suffix and documented in Vishay's ordering information table. It undergoes stress testing for temperature cycling, high-temperature reverse bias, and ESD - making it approved for under-hood and chassis-mounted automotive electronics. Its 150 °C TJ max and MSL Level 1 rating further validate its suitability for automotive SMT assembly.
What does the "CA" suffix mean in SM6T33CAHE3_B/I?
The "CA" suffix in SM6T33CAHE3_B/I denotes a bidirectional configuration - meaning the device provides symmetrical clamping for both positive and negative transients. Unlike unidirectional variants (e.g., SM6T33A), this part has no polarity marking and functions identically regardless of voltage polarity, which is essential for protecting AC-coupled or differential signal lines like CAN or RS-485.
What is the clamping voltage (VC) of SM6T33CAHE3_B/I at rated surge current?
At its peak pulse current (IPPM) of 13.1 A with a 10/1000 μs waveform, the SM6T33CAHE3_B/I clamps to a maximum of 59 V. This VC value is measured per JEDEC standard and guarantees that downstream circuitry sees no more than 59 V during surge events - a critical parameter for ensuring compatibility with 3.3 V or 5 V logic interfaces protected by this TVS diode.
Does SM6T33CAHE3_B/I have a defined pinout or polarity marking?
No - SM6T33CAHE3_B/I is a bidirectional TVS diode in SMB package and carries no polarity marking (no cathode band). Both terminals are electrically identical and interchangeable in layout. This absence of marking reflects its symmetrical conduction behavior, distinguishing it from unidirectional variants like SM6T33A, which feature a visible cathode band for orientation-dependent placement.
SM6T33CAHE3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SM6T33CAHE3_B/I FAQ
1.How can I place an order for SM6T33CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33CAHE3_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 SM6T33CAHE3_B/I reliable?
The price and inventory of SM6T33CAHE3_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 SM6T33CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SM6T33CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33CAHE3_B/I?
SM6T33CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33CAHE3_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 SM6T33CAHE3_B/I?
For technical support, including SM6T33CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33CAHE3_B/I requirements.
6.How does Aetrix verify that SM6T33CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T33CAHE3_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 SM6T33CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SM6T33CAHE3_B/I?
All SM6T33CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33CAHE3_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 SM6T33CAHE3_B/I part is unused and in its original packaging.
Return procedure for SM6T33CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33CAHE3_B/I Tags
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