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Vishay General Semiconductor - Diodes Division SM6T33CAHM3_A/I
- Part No.:
- SM6T33CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33CAHM3_A/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,056
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Product details
Overview
SM6T33CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 33 V standoff voltage (VWM), 37.1–41.0 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), 59 V maximum clamping voltage at 13.1 A IPPM, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SM6T33CAHM3_A/I datasheet, SM6T33CAHM3_A/I pinout, SM6T33CAHM3_A/I application, or SM6T33CAHM3_A/I equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, SMB package thermal and mechanical data, AEC-Q101 qualification status, and direct alternatives for ESD/surge protection in automotive sensor interfaces and industrial control I/O.
Technical Context
The SM6T33CAHM3_A/I is a glass-passivated, bidirectional TVS diode optimized for low-inductance transient suppression in high-reliability environments. Its symmetrical breakdown characteristic enables identical clamping in both polarities, with VBR specified between 37.1 V and 41.0 V at 1 mA test current and VC ≤ 59 V at 13.1 A (10/1000 μs).
It operates across –65 °C to +150 °C junction temperature range, exhibits 100 °C/W typical RθJA on standard 0.2" × 0.2" copper pads, and meets JESD201 Class 2 whisker resistance and MSL Level 1 (260 °C peak reflow). The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101-qualified construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin. |
| VBR (min/max) | 37.1 V / 41.0 V at 1 mA - Confirmed bidirectional breakdown threshold; ensures symmetric overvoltage triggering. |
| VC @ IPPM | 59 V at 13.1 A (10/1000 μs) - Clamped voltage during surge; limits downstream IC stress to sub-60 V level. |
| PPPM | 600 W - Peak pulse power handling per 10/1000 μs waveform; supports common ISO 7637-2 and IEC 61000-4-5 threat levels. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial ambient conditions. |
| Package | SMB (DO-214AA) - Surface-mount outline with 2.2 mm height and 3.94 mm length; compatible with automated SMT placement and reflow. |
| Qualification | AEC-Q101 qualified - Validated for automotive electronics reliability including temperature cycling, HTRB, and ESD. |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A (bidirectional) | One side of symmetrical PN junction; connects to protected line without polarity constraint. |
| Cathode | Terminal B (bidirectional) | Other side of symmetrical PN junction; completes bidirectional clamping path across protected node. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges without derating in standard PCB layouts. |
| AEC-Q101 qualification (HM3 suffix) | Validates reliability for automotive powertrain, body electronics, and ADAS sensor modules requiring zero-failure field performance. |
| Low clamping ratio (VC/VBR ≈ 1.52) | Minimizes voltage overshoot during transients-critical for protecting 3.3 V/5 V logic and analog front-ends in sensor signal chains. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
| Halogen-free & RoHS-compliant (HM3) | Fulfills environmental compliance mandates for global automotive OEMs and industrial equipment sold in EU, China, and Korea. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Limits transient excursions to ≤59 V, preserving integrity of 5 V tolerant transceivers and ADC inputs while meeting ISO 16750-2 requirements. |
Use Scenario: Safeguarding digital input/output terminals of programmable logic controllers against 2 kV/1 A surge events per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary surge suppression element on field-side I/O traces, mounted adjacent to connector entry points. Use Value: Absorbs 600 W pulses without degradation, enabling >100,000 surge cycles and eliminating need for secondary MOV or gas discharge tube stages. |
| Consumer Power Adapter Interface | Telecom Line Card Surge Suppression |
|
Use Scenario: Clamping induced surges on AC-DC adapter secondary-side DC output rails feeding USB-C PD or 12 V peripherals. IC Role / Device Role / Timing Role: Secondary-side TVS parallel to output capacitor, responding within <1 ns to fast-rising transients. Use Value: Low inductance SMB layout ensures sub-59 V clamping even at di/dt >100 A/μs, preventing latch-up in downstream DC-DC controllers. |
Use Scenario: Protecting Ethernet PHY or xDSL line driver pins from lightning-induced surges entering via RJ-45 jacks. IC Role / Device Role / Timing Role: First-line bidirectional clamp on twisted-pair differential pairs before transformer or receiver IC. Use Value: Symmetric VBR and VC ensure balanced clamping on both conductors, maintaining common-mode rejection and signal integrity up to 100 MHz. |
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 SMB package, 33 V VWM, but lower PPPM (400 W); non-AEC-Q101; higher VC (64.5 V at 9.3 A) | Targeted at commercial-grade consumer/industrial designs where automotive qualification is not required | Select SMAJ33CA only when cost sensitivity outweighs automotive reliability and higher surge margin needs. |
| SMCJ33CA | Larger SMC (DO-214AB) package; same 33 V VWM and AEC-Q101 option available; higher PPPM (1500 W); VC = 53.3 V at 28.3 A | Used where higher energy absorption is needed-e.g., main power rail protection or harsher EMC environments | Choose SMCJ33CA when board space allows larger footprint and system-level surge testing exceeds 600 W capability. |
Compared with SMAJ33CA and SMCJ33CA, SM6T33CAHM3_A/I delivers optimal balance of AEC-Q101 compliance, 600 W surge rating, and SMB footprint-making it the preferred choice for space-constrained automotive sensor nodes and industrial I/O modules requiring validated reliability without package size penalty.
Availability
SM6T33CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom line card surge suppression requiring stable component supply, long-term lifecycle support, and traceable AEC-Q101-qualified sourcing.
Supply support for SM6T33CAHM3_A/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 reliability, efficiency, and application-specific optimization.
The SM6T Series was developed specifically for surface-mount transient suppression in automotive, industrial, and communications systems-prioritizing low clamping voltage, AEC-Q101 qualification, and compatibility with high-speed automated assembly.
FAQ
What does the "HM3" suffix indicate in SM6T33CAHM3_A/I?
The HM3 suffix in SM6T33CAHM3_A/I denotes halogen-free, RoHS-compliant construction with full AEC-Q101 qualification. It confirms compliance with automotive reliability standards including temperature cycling, highly accelerated life testing (HALT), and electrostatic discharge (ESD) immunity-making SM6T33CAHM3_A/I suitable for under-hood and safety-critical vehicle subsystems.
Is SM6T33CAHM3_A/I unidirectional or bidirectional?
SM6T33CAHM3_A/I is a bidirectional TVS diode, as confirmed by the "CA" suffix in its part number. It provides symmetrical clamping in both polarities, with identical VBR (37.1–41.0 V) and VC (≤59 V) characteristics regardless of voltage polarity-ideal for protecting AC-coupled signals, differential buses, or floating power domains where polarity reversal may occur.
What is the maximum clamping voltage of SM6T33CAHM3_A/I under surge conditions?
The maximum clamping voltage (VC) of SM6T33CAHM3_A/I is 59 V when subjected to a 10/1000 μs waveform with a peak pulse current (IPPM) of 13.1 A. This value is measured per JEDEC standards and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events, ensuring compatibility with 3.3 V and 5 V logic interfaces.
Can SM6T33CAHM3_A/I replace SM6T33A in an existing design?
No-SM6T33CAHM3_A/I is bidirectional, whereas SM6T33A is unidirectional. Substituting SM6T33CAHM3_A/I for SM6T33A would eliminate polarity dependence but may alter leakage behavior and forward conduction paths. For unidirectional applications requiring cathode-anode orientation, SM6T33A remains appropriate; SM6T33CAHM3_A/I must be used only where bidirectional clamping is explicitly required and validated.
What PCB pad layout is recommended for SM6T33CAHM3_A/I?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad area per terminal for SM6T33CAHM3_A/I to achieve rated thermal performance and 600 W pulse power dissipation. The recommended mounting pad layout matches DO-214AA (SMB) industry standard dimensions, with 2.18 mm min. pad width and 5.59 mm reference body length-ensuring optimal solder joint reliability and thermal conduction during surge events.
SM6T33CAHM3_A/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:
- Obsolete
- 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_A/I FAQ
1.How can I place an order for SM6T33CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33CAHM3_A/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_A/I reliable?
The price and inventory of SM6T33CAHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SM6T33CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33CAHM3_A/I?
SM6T33CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33CAHM3_A/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_A/I?
For technical support, including SM6T33CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33CAHM3_A/I requirements.
6.How does Aetrix verify that SM6T33CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6T33CAHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SM6T33CAHM3_A/I?
All SM6T33CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33CAHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for SM6T33CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33CAHM3_A/I Tags
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Diodes Incorporated
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Diodes Incorporated
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