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Vishay General Semiconductor - Diodes Division SM6T33CAHM3_B/I
- Part No.:
- SM6T33CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33CAHM3_B/I.pdf
- Description:
- 600W,33V,5%,BIDIR, SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,936
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Product details
Overview
SM6T33CAHM3_B/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 33 V standoff voltage (VWM), 37.1–41.0 V breakdown (VBR), and 600 W peak pulse power (10/1000 μs). It clamps transients to ≤59 V at 13.1 A, with <1.0 μA leakage at VWM, and is halogen-free, RoHS-compliant, and AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the SM6T33CAHM3_B/I datasheet, SM6T33CAHM3_B/I pinout, SM6T33CAHM3_B/I application, or SM6T33CAHM3_B/I equivalent, key selection factors include bidirectional clamping symmetry, AEC-Q101 qualification status, SMB thermal resistance (RθJA = 100 °C/W), low clamping ratio (VC/VBR ≈ 1.58), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
The SM6T33CAHM3_B/I operates as a bidirectional avalanche diode, leveraging glass-passivated junction technology to deliver symmetrical reverse/forward clamping behavior across both polarities. Its 10/1000 μs waveform rating supports robust surge immunity against inductive switching events and ESD-induced transients in automotive signal lines.
Designed for surface-mount use in SMB (DO-214AA) package, it features low inductance and meets MSL Level 1 (260 °C reflow peak), enabling reliable operation up to TJ = +150 °C. The device exhibits no polarity marking-consistent with bidirectional construction-and is validated per JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 37.1 V / 41.0 V at IT = 1.0 mA - Confirmed avalanche onset tolerance ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 59 V at 13.1 A (10/1000 μs) - Clamping voltage limits downstream stress; VC/VBR ratio of ~1.58 indicates efficient suppression. |
| PPPM | 600 W - Peak pulse power handling capacity under standardized surge waveform; enables protection against IEC 61000-4-5 Level 3/4 surges. |
| ID @ VWM | <1.0 μA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance nodes. |
| TJ max | +150 °C - Maximum junction temperature rating supports under-hood automotive deployment without derating at ambient ≤125 °C. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 5.0 mm × 5.0 mm pads; informs board-level thermal design requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads solderable per J-STD-002/JESD22-B102. No polarity marking - consistent with bidirectional functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (negative polarity) | One terminal of symmetrical avalanche junction; accepts reverse surge current during negative transients. |
| Cathode | Transient current entry point (positive polarity) | Second terminal of symmetrical avalanche junction; accepts reverse surge current during positive transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both directions eliminates need for polarity-aware layout or orientation verification. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock per AEC specification. |
| 600 W peak pulse power | Supports protection against high-energy transients such as load dump (ISO 7637-2 Pulse 5a) and ISO 16750-2 surges. |
| Low clamping voltage (59 V) | Ensures protected ICs (e.g., CAN transceivers, sensor interfaces) remain below absolute maximum ratings during surge events. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard lead-free reflow profiles up to 260 °C peak. |
Applications
| Automotive Sensor Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting analog output sensors (e.g., pressure, temperature) in engine control modules from load-dump and jump-start induced transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across sensor supply and ground to clamp ± transients before they reach precision ADC front-end. Use Value: Prevents sensor signal corruption and microcontroller reset by limiting voltage excursions to ≤59 V during 100 V/50 ms load-dump events. | Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TJA1044) against ESD and coupled noise on differential bus lines. IC Role / Device Role / Timing Role: Placed between CANH/CANL and ground to absorb common-mode surges while preserving signal integrity up to 5 Mbps. Use Value: Maintains bus availability during 8 kV contact ESD (IEC 61000-4-2) without latch-up or parametric shift in differential threshold. |
| Industrial PLC I/O Protection | Automotive Infotainment Power Rails |
Use Scenario: Shielding 24 V digital input modules from field-wiring induced surges caused by relay coil de-energization. IC Role / Device Role / Timing Role: Connected line-to-ground on each input channel to shunt inductive kickback energy away from optocoupler inputs. Use Value: Extends module MTBF by preventing optocoupler degradation and false triggering during repetitive 100 V/100 ms transients. | Use Scenario: Guarding 5 V/3.3 V power rails feeding touch controllers and display drivers in head units against battery-line transients. IC Role / Device Role / Timing Role: Mounted directly at rail entry point to clamp fast-rising spikes (e.g., ISO 7637-2 Pulse 1/2) before LDOs or DC/DC converters. Use Value: Avoids brown-out resets and display flicker by holding rail voltage above 3.0 V during 100 V/40 ms pulses with sub-10 ns response. |
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 lower PPPM (400 W); SMA package (larger RθJA = 140 °C/W). | Limited to lower-energy surges; less suitable for automotive load-dump where 600 W margin is required. | Select SMAJ33CA only if space constraints favor SMA footprint and surge profile is limited to IEC 61000-4-5 Level 2. |
| 1.5KE33CA | Higher PPPM (1500 W) but axial DO-201 package; not SMT-compatible; higher inductance. | Requires through-hole assembly; unsuitable for high-density automotive PCBs or automated production. | Choose 1.5KE33CA only for prototyping or legacy through-hole designs where rework tolerance outweighs SMT efficiency. |
Compared with SMAJ33CA and 1.5KE33CA, the SM6T33CAHM3_B/I uniquely combines AEC-Q101 qualification, 600 W capability in compact SMB, and halogen-free compliance-making it the preferred choice for volume automotive SMT production where reliability, thermal performance, and regulatory alignment are jointly critical.
Availability
SM6T33CAHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor protection, CAN bus transient suppression, and industrial PLC I/O requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6T33CAHM3_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 automotive, industrial, and computing applications.
The SM6T Series was developed specifically for robust, surface-mount transient voltage suppression in harsh environments-prioritizing AEC-Q101 compliance, low clamping ratio, and automated assembly readiness for automotive electronics.
FAQ
What is the clamping voltage of the SM6T33CAHM3_B/I under a 10/1000 μs surge?
The SM6T33CAHM3_B/I clamps to a maximum of 59 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 reflects worst-case performance across temperature and process variation. The SM6T33CAHM3_B/I maintains this clamping level consistently due to its glass-passivated junction and symmetric bidirectional structure.
Is the SM6T33CAHM3_B/I suitable for automotive applications?
Yes, the SM6T33CAHM3_B/I is AEC-Q101 qualified, halogen-free, and RoHS-compliant-meeting stringent automotive reliability requirements. Its SMB package supports MSL Level 1 reflow, and its 150 °C junction rating allows operation in under-hood environments. The SM6T33CAHM3_B/I is explicitly designated for automotive use via the "HM3" suffix and revision "B/I" tape-and-reel packaging.
Does the SM6T33CAHM3_B/I have polarity markings on the package?
No, the SM6T33CAHM3_B/I has no polarity marking because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SM6T33A), which feature a cathode band, the SM6T33CAHM3_B/I uses identical electrical behavior in both directions-eliminating orientation dependency during placement. This simplifies PCB layout and reduces assembly errors.
What is the maximum reverse leakage current for the SM6T33CAHM3_B/I at its standoff voltage?
The SM6T33CAHM3_B/I exhibits a maximum reverse leakage current of 1.0 μA at its rated standoff voltage (VWM) of 33 V and TA = 25 °C. This ultra-low leakage ensures minimal impact on high-impedance sensor bias networks and preserves battery life in always-on automotive modules where the SM6T33CAHM3_B/I is commonly deployed.
How does the thermal performance of the SM6T33CAHM3_B/I compare to similar SMB TVS diodes?
The SM6T33CAHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 5.0 mm × 5.0 mm copper pads-matching industry-standard SMB thermal benchmarks. Its glass-passivated chip junction and optimized leadframe design enable stable power derating up to +125 °C ambient, making the SM6T33CAHM3_B/I thermally competitive with other AEC-Q101-rated SMB TVS devices.
SM6T33CAHM3_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)
SM6T33CAHM3_B/I FAQ
1.How can I place an order for SM6T33CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33CAHM3_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 SM6T33CAHM3_B/I reliable?
The price and inventory of SM6T33CAHM3_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 SM6T33CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SM6T33CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33CAHM3_B/I?
SM6T33CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33CAHM3_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 SM6T33CAHM3_B/I?
For technical support, including SM6T33CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33CAHM3_B/I requirements.
6.How does Aetrix verify that SM6T33CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SM6T33CAHM3_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 SM6T33CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SM6T33CAHM3_B/I?
All SM6T33CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33CAHM3_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 SM6T33CAHM3_B/I part is unused and in its original packaging.
Return procedure for SM6T33CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33CAHM3_B/I Tags
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Diodes Incorporated
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Diodes Incorporated
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