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Vishay General Semiconductor - Diodes Division 1.5SMC33A-M3/57T
- Part No.:
- 1.5SMC33A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33A-M3/57T.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC SMC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
1.5SMC33A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 33 V breakdown voltage (VBR = 31.4–34.7 V at 1 mA), 28.2 V stand-off voltage (VWM), clamps transients to ≤45.7 V at 32.8 A peak pulse current, and delivers 1500 W peak pulse power with a 10/1000 µs waveform - used in automotive sensor line protection and industrial DC power rail surge suppression.
For engineers reviewing the 1.5SMC33A-M3/57T datasheet, 1.5SMC33A-M3/57T pinout, 1.5SMC33A-M3/57T application, or 1.5SMC33A-M3/57T equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, 150 °C max junction temperature, low incremental surge resistance, and halogen-free RoHS compliance per M3 suffix.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM (28.2 V) and rapidly avalanches above VBR (min. 31.4 V) to limit transient voltages. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), critical for protecting MOSFET gates and microcontroller I/O against ESD and lightning-induced surges.
The 1.5SMC33A-M3/57T is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine), supports 6.5 W steady-state power dissipation at 50 °C on infinite heatsink, and exhibits a thermal resistance of 75 °C/W (junction-to-ambient) when mounted on 8.0 mm × 8.0 mm copper pads - enabling reliable operation in thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1 mA - defines precise avalanche onset range for predictable clamping threshold |
| VWM | 28.2 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC @ IPPM | ≤45.7 V at 32.8 A - clamping voltage under 1500 W 10/1000 µs transient, limiting stress on downstream ICs |
| PPPM | 1500 W - peak pulse power handling capability with 0.01% duty cycle, suitable for infrequent surge events |
| IFSM | 200 A - single half-sine surge rating (8.3 ms), supporting high-energy inductive switch-off protection |
| TJ max | +150 °C - enables use in under-hood automotive and industrial environments without derating |
| Package | SMC (DO-214AB) - standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C reflow peak), cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected circuit ground or low-side reference | Provides low forward voltage drop path during surge conduction; must be routed with low-inductance trace |
| Cathode | Current exit terminal in forward bias; marked with band; connected to protected line (e.g., 24 V rail) | Defines unidirectional polarity - reverse-biased during normal operation, avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 µs) | Enables protection against severe lightning-induced transients per IEC 61000-4-5 Level 4 without cascaded stages |
| Glass-passivated junction | Ensures long-term stability of VBR and low parameter drift across temperature and lifetime |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and automotive ELV directive compliance |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD > 1 kV/ns) |
| AEC-Q101 qualified option available | Supports automotive-grade qualification path (though 1.5SMC33A-M3/57T itself is commercial grade) |
Applications
| Automotive Sensor Protection | Industrial DC Power Rail |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between signal line and chassis ground, responding within <1 ns to suppress transients up to 100 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V interface ICs by limiting voltage to ≤45.7 V during 32.8 A surge events. |
Use Scenario: Safeguarding 24 V DC input rails in PLC modules and motor drives against inductive switching spikes and lightning surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power entry, coordinated with upstream fuses and downstream DC-DC converters. Use Value: Absorbs 1500 W transient energy without failure, maintaining system uptime where replacement access is limited. |
| Consumer Power Adapter Output | Telecom Line Interface |
|
Use Scenario: Secondary-side surge protection on 12 V/19 V outputs of AC-DC adapters for laptops and monitors. IC Role / Device Role / Timing Role: Final-stage TVS after bulk capacitance, shunting residual transients before reaching USB-PD controllers or display drivers. Use Value: Clamps output to safe levels during hot-plug or cable discharge events, avoiding brownout resets or firmware corruption. |
Use Scenario: Overvoltage protection on Ethernet PHY power pins (e.g., 3.3 V bias rails) and auxiliary control lines in PoE-powered switches. IC Role / Device Role / Timing Role: Localized clamping element adjacent to sensitive PHY ICs, minimizing trace inductance impact on response. Use Value: Maintains signal integrity by limiting voltage excursions to <46 V during fast-rising common-mode surges on twisted-pair interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A-E3/52 | Lower peak power (600 W), SMB package (smaller footprint, higher RθJA = 85 °C/W) | Better suited for space-constrained consumer electronics with lower surge severity | Select when board area is critical and surge threat level is ≤IEC 61000-4-5 Level 2 |
| 1.5KE33A-T | Through-hole DO-201 package, same VBR/VC, but slower thermal response and no MSL-1 rating | Used in legacy industrial power supplies where manual assembly or wave soldering is required | Choose only if SMT process is unavailable or mechanical robustness under vibration is prioritized over thermal performance |
Compared with 1.5SMC33A-M3/57T, SMBJ33A-E3/52 offers smaller size but reduced surge margin, while 1.5KE33A-T sacrifices surface-mount compatibility and reflow capability for through-hole ruggedness - making 1.5SMC33A-M3/57T optimal for modern automated production of automotive and industrial SMT assemblies requiring 1500 W clamping.
Availability
1.5SMC33A-M3/57T is available at Aetrix Electronics and suitable for automotive sensor protection, industrial DC power rail hardening, and telecom line interface applications requiring stable component supply, halogen-free compliance, and consistent SMC (DO-214AB) packaging.
Supply support for 1.5SMC33A-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, precision, and automotive-grade qualification.
The 1.5SMC Series was developed for high-power surface-mount transient suppression in demanding environments - targeting automotive, industrial, and telecom systems where compact size, high surge capability, and long-term parametric stability are essential.
FAQ
What is the maximum clamping voltage of the 1.5SMC33A-M3/57T under full-rated surge current?
The 1.5SMC33A-M3/57T clamps to a maximum of 45.7 V when subjected to its rated peak pulse current of 32.8 A (10/1000 µs waveform). This value is measured per standard test conditions in the Vishay datasheet (Document Number 88303, page 2) and represents the upper bound of voltage seen by downstream components during worst-case transient events. The 1.5SMC33A-M3/57T maintains this clamping performance across its specified operating temperature range.
Is the 1.5SMC33A-M3/57T AEC-Q101 qualified?
No, the 1.5SMC33A-M3/57T is a commercial-grade part with halogen-free and RoHS-compliant construction (M3 suffix), but it is not AEC-Q101 qualified. Vishay offers AEC-Q101 variants under different ordering codes such as 1.5SMC33AHM3_A/H, which include additional automotive-specific testing and traceability. The 1.5SMC33A-M3/57T is intended for industrial and consumer applications where automotive qualification is not required.
What does the "/57T" suffix indicate in 1.5SMC33A-M3/57T?
"/57T" denotes the packaging configuration: 7-inch diameter plastic tape and reel containing 850 units, per Vishay's ordering information table (page 3 of Document 88303). This format is optimized for high-speed pick-and-place assembly. The "M3" prefix confirms halogen-free, RoHS-compliant materials, while "A" specifies unidirectional polarity. The 1.5SMC33A-M3/57T is fully compatible with standard SMC (DO-214AB) footprint and reflow profiles.
Can the 1.5SMC33A-M3/57T be used in bidirectional protection circuits?
No, the 1.5SMC33A-M3/57T is strictly unidirectional, as indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay specifies parts with "CA" suffixes (e.g., 1.5SMC33CA). Using the 1.5SMC33A-M3/57T in reverse-biased configurations risks premature breakdown or inconsistent clamping behavior. Always match polarity designation to circuit topology - the 1.5SMC33A-M3/57T must be oriented with cathode toward the protected line.
What is the thermal resistance junction-to-ambient for the 1.5SMC33A-M3/57T?
The typical thermal resistance junction-to-ambient (RθJA) for the 1.5SMC33A-M3/57T is 75 °C/W, measured with the device mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per JEDEC standards. This value assumes standard PCB layout and natural convection cooling. For higher ambient temperatures or sustained power dissipation, derating per Figure 2 in the Vishay datasheet (Document 88303) is required to maintain TJ ≤ 150 °C. The 1.5SMC33A-M3/57T's RθJA directly impacts its usable surge repetition rate in thermally dense designs.
1.5SMC33A-M3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 32.8A
- 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)
1.5SMC33A-M3/57T FAQ
1.How can I place an order for 1.5SMC33A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33A-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 1.5SMC33A-M3/57T reliable?
The price and inventory of 1.5SMC33A-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 1.5SMC33A-M3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC33A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33A-M3/57T?
1.5SMC33A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33A-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 1.5SMC33A-M3/57T?
For technical support, including 1.5SMC33A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33A-M3/57T requirements.
6.How does Aetrix verify that 1.5SMC33A-M3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33A-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 1.5SMC33A-M3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC33A-M3/57T?
All 1.5SMC33A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33A-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 1.5SMC33A-M3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC33A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33A-M3/57T Tags
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