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Vishay General Semiconductor - Diodes Division SM15T33CA-M3/57T
- Part No.:
- SM15T33CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33CA-M3/57T.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,272
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Product details
Overview
SM15T33CA-M3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 33 V standoff voltage (VWM), 37.5 V clamping voltage at 33 A peak pulse current, and operating junction temperature up to +150 °C. It protects signal lines and power rails in automotive sensor units and industrial I/O interfaces against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T33CA-M3/57T datasheet, SM15T33CA-M3/57T pinout, SM15T33CA-M3/57T application, or SM15T33CA-M3/57T equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.14), halogen-free RoHS compliance (M3 suffix), and AEC-Q101 qualification readiness via HM3 variant.
Technical Context
The SM15T33CA-M3/57T implements a glass-passivated silicon avalanche junction optimized for high-energy transient suppression with low dynamic impedance. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-sensitive layout constraints.
Designed for surface-mount placement on 8.0 mm × 8.0 mm copper pads, it achieves thermal resistance of 75 °C/W (junction-to-ambient) and supports surge currents up to 33 A (10/1000 μs) while maintaining clamping voltage ≤37.5 V - critical for safeguarding 3.3 V–33 V logic and analog interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit's normal operating range. |
| VBR min / max | 31.4 V / 34.7 V at 1 mA - breakdown threshold tolerance defines minimum guaranteed clamping onset and avoids premature conduction. |
| VC @ IPPM | 37.5 V at 33 A (10/1000 μs) - actual clamped voltage during worst-case surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - peak transient energy handling capacity under standardized waveform; validates suitability for lightning-level threats per IEC 61000-4-5. |
| TJ max | +150 °C - maximum junction temperature rating enables reliable operation in under-hood automotive and industrial ambient environments. |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SM15T33CA-M3/57T uses a 2-terminal SMC (DO-214AB) package with no polarity marking - consistent with bidirectional functionality. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (unmarked) | Bidirectional transient path | Either terminal serves as anode or cathode depending on transient polarity; eliminates orientation dependency during PCB assembly. |
| Case (cathode band absent) | Non-polarized junction | Absence of band marking confirms symmetric internal structure; required for AC-coupled or floating-line protection applications. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Validates robustness against IEC 61000-4-5 Level 4 surges (4 kV line-to-earth) without derating in standard PCB layouts. |
| Clamping ratio VC/VWM = 1.14 | Minimizes overvoltage margin between operating rail and clamp level - essential for protecting 3.3 V and 5 V logic with tight voltage tolerances. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU Directive 2015/863 for restricted substances in commercial and automotive supply chains. |
| MSL Level 1 (J-STD-020), 260 °C peak reflow | Enables single-pass lead-free reflow without moisture sensitivity concerns - eliminates baking step in high-volume SMT production. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD and LIN bus transceivers in engine control modules from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pair or power rail to shunt transient energy before reaching PHY layer. Use Value: Maintains signal integrity by limiting voltage excursion to ≤37.5 V during 33 A surges - within absolute maximum ratings of TJA1042 and MCP2562 transceivers. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing inductive kickback energy at field-side terminals before optocoupler input stage. Use Value: Prevents false triggering and latch-up by clamping transients within 1 ns response time and sustaining 1500 W for 1 ms - exceeding EN 61000-4-4 burst immunity requirements. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-stage TVS on secondary-side DC output rails (e.g., 48 V PSE) to absorb common-mode transients coupled through transformer windings. Use Value: Delivers 1500 W surge handling without degradation after 1000+ events - validated per Telcordia GR-1089-CORE Zone 3 requirements. |
Use Scenario: Secondary-side overvoltage protection in USB-C PD adapters where 20 V output rails interface with portable devices. IC Role / Device Role / Timing Role: Clamp device across VBUS and GND to suppress fast-rising ESD (IEC 61000-4-2 ±15 kV contact) and capacitor discharge transients. Use Value: Achieves <1 ns response time and <37.5 V clamping - below USB PD 3.1 VBUS overvoltage lockout threshold - preventing adapter shutdown during ESD events. |
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-E3/57T | Lower peak pulse power (400 W), same VWM/VC, SMA package (smaller footprint, higher RθJA = 110 °C/W) | Limited to lower-energy threats (IEC 61000-4-2 only); unsuitable for lightning-level surges requiring >1 kW handling. | Select when board space is constrained and threat profile excludes 10/1000 μs surges above 100 A. |
| SMCJ33CA-M3 | Identical electrical specs and SMC package, but M3 suffix only (no /57T tape-and-reel designation); may differ in reel quantity and packaging traceability. | No functional difference; suitable for same applications if procurement logistics accept alternate reel format. | Choose when standard M3 bulk packaging meets production line feeder requirements and /57T-specific traceability is not mandated. |
Compared with SMAJ33CA-E3/57T and SMCJ33CA-M3, the SM15T33CA-M3/57T delivers 275 % higher peak pulse power in the same SMC footprint - enabling single-device protection against combined lightning and switching transients without parallel stacking or thermal derating.
Availability
SM15T33CA-M3/57T is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, and telecom line interfaces requiring stable component supply with halogen-free compliance and AEC-Q101 qualification pathway.
Supply support for SM15T33CA-M3/57T 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, and protection devices with emphasis on reliability, power handling, and automotive-grade qualification.
The SM15T Series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 readiness are mandatory.
FAQ
What does the "CA" suffix indicate in SM15T33CA-M3/57T?
The "CA" suffix in SM15T33CA-M3/57T denotes a bidirectional configuration, meaning the device provides symmetrical clamping in both forward and reverse directions. This eliminates polarity concerns during PCB layout and makes SM15T33CA-M3/57T ideal for AC-coupled lines, differential buses like CAN, and floating-ground systems where transient polarity is unpredictable.
Is SM15T33CA-M3/57T qualified to AEC-Q101?
SM15T33CA-M3/57T itself is halogen-free and RoHS-compliant (M3 suffix) but not AEC-Q101 qualified. For automotive-grade qualification, Vishay offers the HM3 variant (e.g., SM15T33CAHM3_A/H). The SM15T33CA-M3/57T shares identical electrical and thermal characteristics with its HM3 counterpart - only the qualification and traceability documentation differ.
What is the maximum clamping voltage of SM15T33CA-M3/57T under surge conditions?
The maximum clamping voltage of SM15T33CA-M3/57T is 37.5 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 33 A. This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Can SM15T33CA-M3/57T be used in place of unidirectional TVS diodes?
No - SM15T33CA-M3/57T is strictly bidirectional and must not replace unidirectional TVS diodes (e.g., SM15T33A) in DC-biased circuits where reverse leakage or forward conduction could disrupt normal operation. Its symmetric structure lacks a defined cathode band, making it incompatible with polarity-dependent designs such as DC power rail clamping without additional series blocking components.
What PCB pad layout is recommended for optimal thermal performance of SM15T33CA-M3/57T?
Vishay specifies a minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad area per terminal for SM15T33CA-M3/57T to achieve rated 1500 W pulse power and thermal resistance of 75 °C/W. Reducing pad size increases junction temperature rise during surge events and may cause premature thermal failure - especially in multi-pulse or high-ambient applications.
SM15T33CA-M3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, 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):
- 33A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SM15T33CA-M3/57T FAQ
1.How can I place an order for SM15T33CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33CA-M3/57T 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 SM15T33CA-M3/57T reliable?
The price and inventory of SM15T33CA-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T33CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SM15T33CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33CA-M3/57T?
SM15T33CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33CA-M3/57T 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 SM15T33CA-M3/57T?
For technical support, including SM15T33CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33CA-M3/57T requirements.
6.How does Aetrix verify that SM15T33CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T33CA-M3/57T 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 SM15T33CA-M3/57T meets industry standards.
7.What is the process for return or replacement of SM15T33CA-M3/57T?
All SM15T33CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33CA-M3/57T, 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 SM15T33CA-M3/57T part is unused and in its original packaging.
Return procedure for SM15T33CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33CA-M3/57T Tags
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