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Vishay General Semiconductor - Diodes Division SM15T33CA-E3/9AT
- Part No.:
- SM15T33CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33CA-E3/9AT.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,428
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Product details
Overview
SM15T33CA-E3/9AT 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), and clamping voltage of 59.0 V at 169 A peak pulse current. It protects signal lines and power rails in automotive sensor units and industrial I/O interfaces against lightning-induced and switching transients.
For engineers reviewing the SM15T33CA-E3/9AT datasheet, SM15T33CA-E3/9AT pinout, SM15T33CA-E3/9AT application, or SM15T33CA-E3/9AT equivalent, key selection criteria include bidirectional clamping capability, 33 V working voltage, RoHS-compliant commercial-grade packaging, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This device operates as a voltage-clamped surge protector with symmetrical breakdown behavior in both polarities due to its bidirectional construction. Its 1500 W peak pulse rating applies under standardized 10/1000 μs waveform conditions, and clamping performance is specified at 169 A IPPM with VC = 59.0 V.
Thermal resistance is 75 °C/W junction-to-ambient (typical, on recommended 8.0 mm × 8.0 mm copper pads), and it supports operating junction temperatures from –65 °C to +150 °C. The device uses glass-passivated silicon junction technology and meets MSL Level 1 per J-STD-020 at 260 °C peak reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 31.4 V / 34.7 V at 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on margin |
| VC @ IPPM | 59.0 V at 169 A (10/1000 μs) - Clamping voltage limiting downstream component stress during surge events |
| PPPM | 1500 W - Peak transient power handling capacity under standard lightning-surge waveform |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive 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
SM15T33CA-E3/9AT is a two-terminal bidirectional TVS diode housed in SMC (DO-214AB) package. No polarity marking is present on bidirectional variants; terminals are functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Accepts reverse surge current during negative polarity transients; electrically identical to cathode in bidirectional operation |
| Cathode | Transient current entry (positive half-cycle) | Accepts reverse surge current during positive polarity transients; electrically identical to anode in bidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 1500 W peak pulse power | Withstands high-energy lightning surges (IEC 61000-4-5 Level 4) on industrial I/O and automotive sensor lines |
| Low clamping ratio (VC/VBR ≈ 1.76) | Minimizes overvoltage stress on protected ICs compared to higher-ratio suppressors |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, reducing manufacturing overhead |
Applications
| Automotive Sensor Protection | Industrial I/O Line Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine control modules exposed to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential or single-ended signal pairs upstream of interface ICs. Use Value: Limits transient excursions to ≤59.0 V, preserving integrity of 3.3 V/5 V sensor signal chains and preventing latch-up in connected microcontrollers. | Use Scenario: Guarding PLC digital input channels connected to external field wiring subject to inductive kickback from solenoids and contactors. IC Role / Device Role / Timing Role: Primary surge shunt located at PCB edge connector, diverting >100 A transients away from optocoupler inputs and level-shifting circuitry. Use Value: Maintains functional safety by clamping within 100 ns, avoiding false triggering or damage to isolation barriers rated for ≤60 V transient tolerance. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Safeguarding Ethernet PHY front-end circuits (e.g., RJ45 magnetics secondary side) against ESD and lightning-induced surges entering via unshielded twisted pair. IC Role / Device Role / Timing Role: Secondary-side TVS mounted adjacent to transformer center taps or data line terminations. Use Value: Provides <100 ns response with low dynamic impedance, suppressing common-mode transients before they couple into sensitive PHY receivers. | Use Scenario: Protecting AC-DC adapter primary-side rectifier outputs and secondary-side DC bus lines from mains-borne surges and capacitor discharge spikes. IC Role / Device Role / Timing Role: Bidirectional clamp across DC output rails or across bridge rectifier outputs to limit overvoltage during startup or fault conditions. Use Value: Enables compliance with IEC 61000-4-5 with minimal BOM count-no separate unidirectional devices needed for dual-polarity rail protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | 600 W peak pulse power (vs. 1500 W); same VWM, VC, and package outline but lower IPPM (100 A vs. 169 A) | Limited to lower-energy threats (IEC 61000-4-5 Level 2); insufficient for automotive load-dump or industrial lightning scenarios | Select SMBJ33CA only when system-level threat analysis confirms ≤600 W surge exposure and board space constraints favor smaller SMB package |
| 1.5KE33CA | Through-hole DO-201 package; identical electrical specs but incompatible with SMT assembly and higher thermal resistance (RθJA ≈ 150 °C/W) | Requires manual soldering or wave soldering; unsuitable for high-density or automated production environments | Choose 1.5KE33CA only for legacy through-hole designs or prototyping where rework flexibility outweighs production efficiency needs |
Compared with SMBJ33CA and 1.5KE33CA, SM15T33CA-E3/9AT delivers 2.5× higher surge power handling in an SMT-compatible SMC package, enabling robust protection in space-constrained automotive and industrial PCBs without compromising manufacturability or thermal performance.
Availability
SM15T33CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter designs requiring stable component supply and RoHS-compliant commercial-grade TVS protection.
Supply support for SM15T33CA-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 is a global supplier of discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SM15T Series is designed for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where failure modes must be controlled and surge immunity must meet IEC/ISO standards.
FAQ
What does the "CA" suffix indicate in SM15T33CA-E3/9AT?
The "CA" suffix in SM15T33CA-E3/9AT denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression for both positive and negative polarity surges. Unlike unidirectional variants (e.g., SM15T33A), SM15T33CA-E3/9AT has no polarity marking and functions identically regardless of voltage polarity applied across its terminals, making it ideal for AC signal lines and floating interfaces.
Is SM15T33CA-E3/9AT qualified for automotive applications?
SM15T33CA-E3/9AT itself is RoHS-compliant commercial grade (E3 suffix). However, the SM15T family offers AEC-Q101 qualified versions under HE3 or HM3 suffixes (e.g., SM15T33CAHE3_A/I). For automotive production use, specify the HE3 variant to ensure qualification to AEC-Q101 stress test requirements while retaining identical electrical characteristics and package dimensions as SM15T33CA-E3/9AT.
What is the maximum clamping voltage of SM15T33CA-E3/9AT under surge conditions?
The maximum clamping voltage (VC) of SM15T33CA-E3/9AT is 59.0 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 169 A. This value is measured per Figure 1 in Vishay document 88380 and represents the upper bound of voltage seen by protected circuitry during worst-case surge events, ensuring compatibility with 3.3 V, 5 V, and 12 V system rails.
Can SM15T33CA-E3/9AT replace unidirectional TVS diodes in existing designs?
SM15T33CA-E3/9AT can replace unidirectional TVS diodes only if the circuit topology is inherently symmetric or polarity-insensitive (e.g., differential pairs, AC-coupled lines). It must not be substituted in unidirectional applications where forward conduction is required (e.g., DC power rail clamping with defined anode/cathode orientation), as its bidirectional structure lacks a designated cathode band and conducts equally in both directions.
What is the thermal resistance and mounting requirement for optimal performance of SM15T33CA-E3/9AT?
SM15T33CA-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, per Vishay document 88380. To achieve rated 1500 W pulse power and avoid thermal runaway, PCB layout must adhere to this minimum pad area; reducing pad size increases RθJA and derates peak power handling proportionally.
SM15T33CA-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:
- -
- 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-E3/9AT FAQ
1.How can I place an order for SM15T33CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33CA-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 SM15T33CA-E3/9AT reliable?
The price and inventory of SM15T33CA-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 SM15T33CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T33CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33CA-E3/9AT?
SM15T33CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33CA-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 SM15T33CA-E3/9AT?
For technical support, including SM15T33CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33CA-E3/9AT requirements.
6.How does Aetrix verify that SM15T33CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T33CA-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 SM15T33CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T33CA-E3/9AT?
All SM15T33CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33CA-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 SM15T33CA-E3/9AT part is unused and in its original packaging.
Return procedure for SM15T33CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33CA-E3/9AT Tags
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