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Vishay General Semiconductor - Diodes Division SM15T33A-E3/57T
- Part No.:
- SM15T33A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33A-E3/57T.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,558
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Product details
Overview
SM15T33A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 33 V stand-off voltage (VWM = 28.2 V), 45.7 V max clamping voltage at 33 A IPPM, and 150 °C max junction temperature. It protects MOSFETs and signal lines in automotive power electronics against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T33A-E3/57T datasheet, SM15T33A-E3/57T pinout, SM15T33A-E3/57T application, or SM15T33A-E3/57T equivalent, key selection criteria include verified clamping performance at 33 A, unidirectional polarity with cathode band marking, RoHS-compliant matte tin-plated leads, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a voltage-clamping protection device in series with sensitive downstream circuitry, triggering avalanche breakdown when reverse voltage exceeds 31.4 V (min VBR) to shunt transient energy away from ICs or power switches. Its low-inductance SMC package and glass-passivated junction ensure fast response (<1 ns) and stable performance under repeated surge stress.
The device complies with IEC 61000-4-5 (lightning surge) and ISO 7637-2 (automotive load dump) requirements when mounted on 8.0 mm × 8.0 mm copper pads. Thermal resistance (RθJL = 15 °C/W) supports reliable operation up to 150 °C junction temperature without derating below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 1500 W - sustains single high-energy surges from lightning or motor switching without failure |
| Stand-off Voltage (VWM) | 28.2 V - maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| Breakdown Voltage (VBR min/max) | 31.4 V / 34.7 V at 1 mA - defines precise avalanche initiation threshold for predictable clamping onset |
| Max Clamping Voltage (VC) | 45.7 V at 33 A IPPM - limits voltage seen by protected circuit during worst-case 10/1000 μs transient |
| Peak Pulse Current (IPPM) | 33 A - maximum non-repetitive surge current the device can safely divert per waveform definition |
| Junction Temperature Range | -65 °C to +150 °C - enables deployment in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height for automated assembly |
Pinout & Package
SM15T33A-E3/57T uses the standard SMC (DO-214AB) package: unidirectional configuration with cathode indicated by a band on the body; anode and cathode terminals are formed by the two molded leads extending from opposite ends of the rectangular body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground or low-side reference | Provides return path for surge current during clamping; must be routed with low-inductance trace to ground plane |
| Cathode (banded end) | Protected line connection point; reverse-biased during normal operation | Connected directly to the line being protected (e.g., 24 V rail or sensor input); clamps to 45.7 V when overvoltage occurs |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power rating | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV) surges without thermal runaway |
| Glass-passivated chip junction | Ensures long-term reliability and stable VBR over 1000+ surge events with <5% parameter shift |
| Low-inductance SMC package | Minimizes voltage overshoot during fast-rising transients (e.g., <100 ns rise time) by limiting parasitic L |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow at 260 °C peak without popcorn failure or delamination |
| AEC-Q101 qualification path | Supports automotive-grade sourcing via HE3/HM3 suffix variants with full stress-test validation |
Applications
| Automotive Power Distribution | Industrial Motor Drive Inputs |
|---|---|
|
Use Scenario: Protection of 24 V supply rails in body control modules against load-dump transients up to 35 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and DC-DC converter input. Use Value: Limits clamped voltage to 45.7 V, preventing damage to 36 V-rated buck controllers and ensuring ASIL-B compliance. |
Use Scenario: Guarding PLC analog input channels from inductive kickback when solenoids de-energize. IC Role / Device Role / Timing Role: Standoff protection on 0–10 V sensor interface lines upstream of precision ADC front-end. Use Value: Maintains signal integrity by clamping transients within 1 ns while adding <0.5 pF capacitance at 0 V bias. |
| Telecom DC Power Feeds | Consumer Appliance Control Boards |
|
Use Scenario: Safeguarding PoE-powered Ethernet switch ports against lightning-induced surges on 48 V DC feeds. IC Role / Device Role / Timing Role: Primary-level TVS on midspan injector output before isolation transformer. Use Value: Absorbs 1500 W pulses without degradation, meeting IEC 61000-4-5 Ed.3 requirements for Class B equipment. |
Use Scenario: Shielding microcontroller GPIOs driving relay coils in smart washing machine mainboards. IC Role / Device Role / Timing Role: Local clamping device across coil terminals, referenced to MCU ground. Use Value: Prevents latch-up in 3.3 V I/O by limiting flyback voltage to 45.7 V, compatible with 50 V-rated ESD structures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Lower peak power (400 W), same VWM (28.2 V), higher VC (53.3 V at 7.5 A) | Suitable only for lower-energy threats (IEC 61000-4-2 ESD, not lightning) | Select SMAJ33A only when board space is constrained and threat level is limited to ±8 kV contact ESD. |
| SMCJ33A | Same 1500 W rating and VWM, but larger SMC package (DO-214AB identical), VC = 45.7 V at 33 A (identical) | Functionally interchangeable; differs only in branding and minor process revision | SMCJ33A is a direct functional alternative with identical electrical specs and mechanical fit-no layout change required. |
Compared with SM15T33A-E3/57T, SMAJ33A offers reduced surge handling for cost-sensitive consumer designs, while SMCJ33A provides identical protection performance with equivalent footprint and mounting compatibility-making it the preferred drop-in alternative where second-source assurance is required.
Availability
SM15T33A-E3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drive inputs, and telecom DC power feeds requiring stable component supply, RoHS compliance, and traceable sourcing.
Supply support for SM15T33A-E3/57T 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 qualification.
The SM15T Series is designed specifically for high-energy transient suppression in harsh environments-including under-hood automotive, industrial automation, and infrastructure power systems-where 1500 W surge capability and AEC-Q101 readiness are mandatory.
FAQ
What is the clamping voltage of SM15T33A-E3/57T at its rated peak pulse current?
The SM15T33A-E3/57T has a maximum clamping voltage (VC) of 45.7 V when subjected to its rated peak pulse current (IPPM) of 33 A under the standardized 10/1000 μs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC standards and ensures downstream components see no more than 45.7 V during surge events.
Is SM15T33A-E3/57T RoHS-compliant and halogen-free?
Yes, SM15T33A-E3/57T carries the "E3" suffix, indicating it is RoHS-compliant per EU Directive 2011/65/EU and meets Vishay's commercial-grade material specifications. It is not halogen-free; for halogen-free compliance, the "M3" suffix variant (e.g., SM15T33A-M3/57T) must be selected.
Does SM15T33A-E3/57T have AEC-Q101 qualification?
No, SM15T33A-E3/57T itself is not AEC-Q101 qualified. However, the SM15T33AHE3_A/H variant (with HE3 suffix) is fully AEC-Q101 qualified for automotive applications. The "E3" suffix denotes commercial grade only; qualification requires explicit HE3 or HM3 ordering codes.
What is the thermal resistance from junction to lead (RθJL) for SM15T33A-E3/57T?
The SM15T33A-E3/57T has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W, measured under standard test conditions. This low value enables efficient heat transfer from the silicon die to the PCB copper pads, supporting sustained operation at elevated ambient temperatures without exceeding the 150 °C maximum junction limit.
How is polarity identified on SM15T33A-E3/57T?
SM15T33A-E3/57T is a unidirectional TVS diode, and polarity is marked by a cathode band located near one end of the SMC (DO-214AB) package body. The banded end corresponds to the cathode terminal; the opposite end is the anode. No marking appears on bidirectional variants, but SM15T33A-E3/57T is strictly unidirectional.
SM15T33A-E3/57T 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:
- 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):
- 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)
SM15T33A-E3/57T FAQ
1.How can I place an order for SM15T33A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33A-E3/57T 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 SM15T33A-E3/57T reliable?
The price and inventory of SM15T33A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T33A-E3/57T is usually 5 days.
3.What payment methods are accepted for SM15T33A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33A-E3/57T?
SM15T33A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33A-E3/57T 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 SM15T33A-E3/57T?
For technical support, including SM15T33A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33A-E3/57T requirements.
6.How does Aetrix verify that SM15T33A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T33A-E3/57T 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 SM15T33A-E3/57T meets industry standards.
7.What is the process for return or replacement of SM15T33A-E3/57T?
All SM15T33A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33A-E3/57T, 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 SM15T33A-E3/57T part is unused and in its original packaging.
Return procedure for SM15T33A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33A-E3/57T Tags
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