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Vishay General Semiconductor - Diodes Division SM6T33CAHM3/I
- Part No.:
- SM6T33CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33CAHM3/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,804
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Product details
Overview
SM6T33CAHM3/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 at 1 mA), 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/I datasheet, SM6T33CAHM3/I pinout, SM6T33CAHM3/I application, or SM6T33CAHM3/I equivalent, key selection criteria include bidirectional clamping symmetry, 150 °C max junction temperature, low inductance layout compatibility, and qualification for automotive-grade ESD/surge immunity per ISO 16750-2 and IEC 61000-4-5.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance in forward and reverse directions - critical for protecting AC-coupled or differential signal lines. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage, while the SMB package provides low thermal resistance (RθJL = 20 °C/W) and meets MSL Level 1 reflow requirements (260 °C peak).
The device is designed for non-repetitive surge suppression using standardized 10/1000 μs and 8/20 μs waveforms. Clamping voltage (VC = 59 V @ 13.1 A) and peak pulse current (IPPM = 13.1 A) are specified under defined PCB pad conditions (0.2" × 0.2" copper), ensuring predictable system-level protection behavior in real layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 3.3 V, 5 V, 12 V, and 24 V rail protection. |
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - Tight 5% tolerance ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 59 V at 13.1 A (10/1000 μs) - Defines worst-case voltage seen by protected IC during surge; enables robust MOSFET/gate driver protection. |
| PPPM | 600 W - Peak transient energy handling capability under standard lightning/surge test waveform; supports IEC 61000-4-5 Level 4 compliance. |
| ID @ VWM | <1.0 μA - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance sensor interfaces. |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures without derating. |
| Package | SMB (DO-214AA) - Surface-mount footprint compatible with automated assembly; 0.220" × 0.130" body size fits tight board spacing. |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated, no polarity marking (bidirectional device).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (either polarity) | Acts as cathode during positive surges and anode during negative surges - symmetrical conduction path for bidirectional protection. |
| Cathode | Transient current exit (either polarity) | Paired terminal forms low-inductance path; terminals are electrically interchangeable due to bidirectional design. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - eliminates need for polarity-aware placement in AC or differential circuits. |
| 600 W peak pulse power | Withstands 10/1000 μs surges up to 13.1 A - meets automotive load-dump and ISO 7637-2 Pulse 5a requirements. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and ESD testing - supports PPAP documentation for Tier-1 suppliers. |
| Halogen-free & RoHS | Meets JEDEC J-STD-20 MSL Level 1 and JESD201 Class 2 whisker resistance - suitable for lead-free reflow and long-life industrial deployments. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting ABS wheel speed sensors and engine crankshaft position sensors from inductive switching spikes and ESD events in 12 V/24 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed across sensor output lines to clamp ±2 kV ESD and ±100 V load dump transients before they reach analog front-end amplifiers. Use Value: Prevents sensor signal corruption and microcontroller reset events; leverages symmetric clamping to avoid polarity misplacement during high-volume SMT assembly. | Use Scenario: Safeguarding CAN transceivers (e.g., TJA1042, SN65HVD230) on vehicle body control modules against bus faults and coupling noise. IC Role / Device Role / Timing Role: Placed between CAN_H/CAN_L differential pair and ground to limit common-mode overvoltage without distorting data integrity. Use Value: Maintains signal eye diagram integrity up to 1 Mbps; low capacitance (<100 pF) avoids timing skew, and AEC-Q101 rating ensures reliability over 15-year vehicle lifetime. |
| Consumer Power Adapter Input | Telecom Ethernet PHY Protection |
Use Scenario: Secondary-side surge suppression on 5 V/12 V DC outputs of wall adapters exposed to mains-borne transients and hot-plug events. IC Role / Device Role / Timing Role: Bidirectional shunt device across output rails to clamp fast-rising line-to-line and line-to-ground surges before reaching downstream USB ports or PMICs. Use Value: Enables UL 62368-1 compliance with minimal BOM cost; SMB footprint allows placement directly at connector entry point with <5 mm trace length. | Use Scenario: Protecting 10/100BASE-TX Ethernet PHYs (e.g., DP83848, LAN8720) from lightning-induced surges entering via RJ45 magnetics. IC Role / Device Role / Timing Role: Connected between transformer center taps and chassis ground to suppress common-mode transients coupled onto twisted-pair lines. Use Value: Achieves IEC 61000-4-5 Level 3 (2 kV line-earth) immunity without degrading 100 MHz signal bandwidth; low leakage avoids bias drift in auto-negotiation circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Same VWM/VBR/VC specs but lower PPPM (400 W); SMA package (larger footprint, higher RθJA = 150 °C/W) | Not AEC-Q101 qualified; limited to commercial-grade industrial or consumer use | Select when cost sensitivity outweighs automotive qualification and thermal performance needs. |
| 1.5KE33CA | Higher PPPM (1500 W) but axial DO-201 package; slower response time due to higher parasitic inductance | Through-hole only; unsuitable for high-speed signal lines or automated SMT lines | Choose only for legacy through-hole designs requiring higher surge margin and where board space permits axial mounting. |
Compared with SMAJ33CA and 1.5KE33CA, SM6T33CAHM3/I delivers optimal balance of automotive qualification, surface-mount scalability, and 600 W surge capacity in a compact SMB footprint - making it preferred for new automotive ECUs, industrial gateways, and space-constrained telecom modules.
Availability
SM6T33CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, and telecom Ethernet PHY protection requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.
Supply support for SM6T33CAHM3/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 is engineered for high-reliability transient suppression in automotive, industrial, and communications systems - delivering precise clamping, low leakage, and qualification-ready performance in surface-mount packages.
FAQ
What does the "CA" suffix indicate in SM6T33CAHM3/I?
The "CA" suffix denotes that SM6T33CAHM3/I is a bidirectional transient voltage suppressor, meaning it provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional variants (e.g., SM6T33A), SM6T33CAHM3/I has no polarity marking and functions identically regardless of voltage polarity applied across its terminals - essential for protecting AC-coupled or differential signal paths.
Is SM6T33CAHM3/I qualified for automotive applications?
Yes, SM6T33CAHM3/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and Vishay's official documentation. This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD, making SM6T33CAHM3/I suitable for under-hood and cabin electronics such as ADAS sensors, body control modules, and infotainment power supplies.
What is the maximum clamping voltage of SM6T33CAHM3/I under surge conditions?
The maximum clamping voltage of SM6T33CAHM3/I is 59 V when subjected to a 10/1000 μs waveform at 13.1 A peak pulse current (IPPM). This value is measured under standardized test conditions (25 °C, 0.2" × 0.2" copper pads) and represents the upper voltage limit imposed on protected circuitry during a worst-case transient event.
How does the SMB package of SM6T33CAHM3/I compare to SMA or SMC in terms of thermal performance?
SM6T33CAHM3/I in SMB (DO-214AA) offers RθJL = 20 °C/W and RθJA = 100 °C/W - superior to SMA (RθJA ≈ 150 °C/W) but less robust than SMC (RθJA ≈ 60 °C/W). Its SMB footprint balances compact size with adequate thermal dissipation for 600 W pulses, especially when mounted on recommended 0.2" × 0.2" copper pads, making it ideal for dense automotive PCB layouts.
Does SM6T33CAHM3/I require orientation during PCB placement?
No, SM6T33CAHM3/I does not require specific orientation because it is a bidirectional device with no polarity marking. Both terminals are functionally identical - either can serve as anode or cathode depending on transient polarity. This eliminates orientation errors during automated placement and simplifies layout for differential or AC signal protection.
SM6T33CAHM3/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:
- -
- 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:
- -
- 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/I FAQ
1.How can I place an order for SM6T33CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33CAHM3/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/I reliable?
The price and inventory of SM6T33CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SM6T33CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33CAHM3/I?
SM6T33CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33CAHM3/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/I?
For technical support, including SM6T33CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33CAHM3/I requirements.
6.How does Aetrix verify that SM6T33CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SM6T33CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SM6T33CAHM3/I?
All SM6T33CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33CAHM3/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/I part is unused and in its original packaging.
Return procedure for SM6T33CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33CAHM3/I Tags
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