My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM15T33A-E3/9AT
- Part No.:
- SM15T33A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33A-E3/9AT.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,095
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM15T33A-E3/9AT from Vishay General Semiconductor is a unidirectional 1500 W Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, with 33 V standoff voltage (VWM = 28.2 V), 34.7 V minimum breakdown voltage (VBR), and 45.7 V maximum clamping voltage (VC) at 33 A peak pulse current. It protects MOSFETs, sensor signal lines, and I/O interfaces in automotive and industrial power electronics against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T33A-E3/9AT datasheet, SM15T33A-E3/9AT pinout, SM15T33A-E3/9AT application, or SM15T33A-E3/9AT equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current handling under 10/1000 μs threat waveforms, thermal resistance (RθJA = 75 °C/W), and RoHS-compliant commercial-grade packaging for automated SMT assembly.
Technical Context
The SM15T33A-E3/9AT employs a glass-passivated silicon junction optimized for low-inductance transient suppression. Its unidirectional polarity features a cathode band marking and operates with a 10/1000 μs waveform-defined peak pulse power of 1500 W and clamping voltage of 45.7 V at 33 A.
Thermal performance is characterized by RθJA = 75 °C/W (junction-to-ambient, on 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W (junction-to-lead), supporting reliable operation up to TJ = +150 °C. It meets J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 28.2 V - Maximum reverse working voltage before conduction; sets upper limit for normal circuit operation without leakage-triggered clamping. |
| VBR (Breakdown Voltage) | 31.4–34.7 V at 1.0 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 45.7 V at IPPM = 33 A (10/1000 μs) - Peak voltage seen by protected device during worst-case surge; defines safe margin below IC absolute maximum ratings. |
| PPPM (Peak Pulse Power) | 1500 W - Sustained energy absorption capability under standardized lightning-surge waveform; validates suitability for IEC 61000-4-5 Level 4 threats. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| RθJA | 75 °C/W - Thermal resistance on recommended 8.0 mm × 8.0 mm pad layout; determines required board copper area for thermal management. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to ground or low-side reference; completes conduction path during reverse transient clamp. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line (e.g., 33 V rail or sensor output); initiates avalanche when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Validated surge immunity for lightning-induced transients per IEC 61000-4-5, enabling robust front-end protection without derating. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage stress on downstream components-e.g., keeps 33 V rail clamped below 46 V during 33 A surge. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| Glass-passivated junction | Ensures stable VBR and low leakage (<1.0 μA at VWM) across temperature and lifetime, critical for long-term reliability in automotive modules. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 33 V battery-supplied ECUs from load-dump and alternator ripple transients in engine control units. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 33 V rail and chassis ground to clamp surges above 34.7 V. Use Value: Limits rail voltage to ≤45.7 V during 33 A transients, preventing damage to 40 V-rated DC-DC controllers and CAN transceivers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input cards. IC Role / Device Role / Timing Role: TVS mounted at sensor connector interface to shunt inductive kickback from nearby solenoid switching. Use Value: Clamps fast-rising transients (<100 ns) with <15 Ω dynamic impedance, preserving signal integrity and ADC accuracy. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Secondary-side surge protection on 24–36 V telecom power supplies feeding baseband processors. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing conducted EFT bursts (IEC 61000-4-4) on DC input before LDO regulators. Use Value: Withstands 1500 W pulses without degradation, maintaining ≤1.0 μA leakage at 28.2 V to avoid standby current impact. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, washing machines). IC Role / Device Role / Timing Role: Unidirectional suppressor across motor terminals referenced to system ground. Use Value: Handles 200 A non-repetitive forward surge (IFSM), surviving repeated motor commutation events without parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | 600 W PPPM, SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VBR/VC specs | Limited to lower-energy threats (e.g., ESD, EFT); unsuitable for lightning-level surges requiring 1500 W | Select when board space is constrained and surge threat level is ≤600 W (e.g., USB port protection). |
| SMCJ33A-E3/9AT | Same SMC package and 1500 W rating, but higher VBR (34.2–37.8 V) and VC (49.9 V at 30 A) | Wider clamping margin; better for systems with higher tolerance for transient overshoot | Choose when design requires tighter VBR distribution control or compatibility with legacy SMCJ layout footprints. |
Compared with SMAJ33A-E3/57T and SMCJ33A-E3/9AT, the SM15T33A-E3/9AT delivers identical 1500 W surge capability in the SMC outline but with tighter VBR (31.4–34.7 V) and lower clamping voltage (45.7 V), enabling more aggressive protection margins for 33 V systems.
Availability
SM15T33A-E3/9AT is available at Aetrix Electronics and suitable for automotive ECU power rail protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply and full traceability.
Supply support for SM15T33A-E3/9AT 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on high-reliability, high-power transient protection solutions.
The SM15T Series is engineered specifically for high-energy surge suppression in automotive, industrial, and telecom infrastructure-delivering 1500 W pulse capability in compact SMC packages with AEC-Q101 qualification options.
FAQ
What is the peak pulse current rating of the SM15T33A-E3/9AT?
The SM15T33A-E3/9AT has a peak pulse current (IPPM) of 33 A under the standard 10/1000 μs waveform. This value is derived directly from its 1500 W peak pulse power rating and 45.7 V clamping voltage (IPPM = PPPM / VC). The SM15T33A-E3/9AT maintains this rating with proper PCB thermal management using 8.0 mm × 8.0 mm copper pads per terminal.
Is the SM15T33A-E3/9AT RoHS-compliant and halogen-free?
Yes, the SM15T33A-E3/9AT carries the "E3" suffix, indicating it is RoHS-compliant and commercial grade per Vishay's ordering nomenclature. It is not halogen-free; for halogen-free compliance, the "M3" suffix variant (e.g., SM15T33A-M3/9AT) must be selected. Both meet JESD 201 Class 2 whisker resistance requirements.
Does the SM15T33A-E3/9AT have AEC-Q101 qualification?
No, the SM15T33A-E3/9AT is not AEC-Q101 qualified. It is a commercial-grade part. For automotive-qualified versions, Vishay offers variants with "HE3" or "HM3" suffixes (e.g., SM15T33AHE3_A/I), which include full AEC-Q101 testing and traceability documentation. The SM15T33A-E3/9AT remains suitable for non-automotive industrial and telecom applications.
What is the maximum operating junction temperature for the SM15T33A-E3/9AT?
The SM15T33A-E3/9AT has a maximum operating junction temperature (TJ max.) of +150 °C, as specified in the Vishay datasheet. This allows deployment in high-ambient environments such as under-hood automotive modules or enclosed industrial drives, provided thermal design respects the RθJA = 75 °C/W rating on recommended copper pad layouts.
How does the clamping voltage of the SM15T33A-E3/9AT compare to similar 33 V TVS diodes?
The SM15T33A-E3/9AT clamps to 45.7 V at 33 A (10/1000 μs), yielding a clamping ratio (VC/VBR) of ~1.31-among the lowest in the 1500 W SMC class. This is tighter than the SMCJ33A-E3/9AT (49.9 V at 30 A) and significantly better than SMAJ33A-E3/57T (64.5 V at 9.3 A), making the SM15T33A-E3/9AT optimal for protecting 40 V-tolerant ICs with minimal voltage headroom.
SM15T33A-E3/9AT 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-E3/9AT FAQ
1.How can I place an order for SM15T33A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33A-E3/9AT 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-E3/9AT reliable?
The price and inventory of SM15T33A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T33A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T33A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33A-E3/9AT?
SM15T33A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33A-E3/9AT 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-E3/9AT?
For technical support, including SM15T33A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33A-E3/9AT requirements.
6.How does Aetrix verify that SM15T33A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T33A-E3/9AT 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-E3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T33A-E3/9AT?
All SM15T33A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33A-E3/9AT, 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-E3/9AT part is unused and in its original packaging.
Return procedure for SM15T33A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33A-E3/9AT Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
