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Vishay General Semiconductor - Diodes Division SM15T33CA-M3/9AT
- Part No.:
- SM15T33CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33CA-M3/9AT.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SM15T33CA-M3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) 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 IPPM, and operating from −65 °C to +150 °C. It protects signal lines in automotive sensor units and industrial I/O interfaces against lightning-induced and inductive-switching transients.
For engineers reviewing the SM15T33CA-M3/9AT datasheet, SM15T33CA-M3/9AT pinout, SM15T33CA-M3/9AT application, or SM15T33CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, 33 V VWM matching interface rail voltage, 37.5 V VC at 33 A IPPM for downstream IC protection, and halogen-free RoHS-compliant M3 suffix for automotive-grade production.
Technical Context
This device operates as a voltage-clamped crowbar during transient events, with symmetrical breakdown behavior in both polarities due to its bidirectional CA construction. Its glass-passivated junction ensures stable VBR (31.4–34.7 V) and low leakage (<1 μA at 28.2 V) across temperature.
Designed for high-impedance source environments, it sustains 33 A peak pulse current (IPPM) under 10/1000 μs waveform when mounted on 8.0 mm × 8.0 mm copper pads, and derates linearly above 25 °C ambient per thermal resistance RθJA = 75 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse voltage before clamping begins; matches 3.3 V logic rails with margin or 24 V industrial bus interfaces. |
| VBR min/max | 31.4 V / 34.7 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 37.5 V @ 33 A - Clamped voltage during 10/1000 μs surge; limits stress on downstream MOSFET gates or MCU I/O pins. |
| PPPM | 1500 W - Peak pulse power handling capacity; suitable for lightning surge (IEC 61000-4-5 Level 3) and motor-switching transients. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive placement and industrial enclosures without forced cooling. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with standard SMT pick-and-place and reflow profiles. |
Pinout & Package
SM15T33CA-M3/9AT uses a two-terminal SMC (DO-214AB) package with no polarity marking-both terminals are functionally identical due to bidirectional symmetry. The device mounts with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Completes low-inductance surge current loop during either polarity event; no fixed DC polarity assignment. |
| Cathode | Transient return path (bidirectional) | Electrically identical to Anode; symmetric structure enables equal clamping in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 1 kV/2 kV surge tests without derating in typical PCB layouts. |
| Low clamping ratio (VC/VBR ≈ 1.14) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in protected ICs. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets automotive OEM material compliance requirements (e.g., GMW3172, Ford WSS-M99P9999-A1) and EU environmental mandates. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking preconditioning. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN 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 directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Maintains 33 V standoff while clamping to 37.5 V, ensuring sensor ICs with 40 V absolute maximum ratings remain within safe operating area during 50 A surge events. | Use Scenario: Safeguarding digital input channels on programmable logic controllers connected to 24 V DC field wiring subject to relay coil flyback and ESD. IC Role / Device Role / Timing Role: Primary transient suppression element on backplane termination, positioned between terminal block and optocoupler input stage. Use Value: Delivers 1500 W pulse handling with <1 μA leakage at 28.2 V, preventing false triggering while surviving repeated 10/1000 μs surges up to 33 A. |
| Telecom Line Interface Protection | Consumer Power Adapter Feedback Loop |
Use Scenario: Shielding Ethernet PHY magnetics and PoE controller inputs from induced surges on outdoor cabling in security camera systems. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after gas discharge tube (GDT) primary protection to refine clamping voltage and absorb residual energy. Use Value: Symmetric 31.4–34.7 V VBR ensures balanced response to differential-mode transients, preserving common-mode rejection in transformer-coupled interfaces. | Use Scenario: Securing optocoupler feedback path in isolated AC/DC adapters where 33 V bias rail supplies TL431 reference and phototransistor. IC Role / Device Role / Timing Role: Overvoltage limiter on secondary-side bias network to prevent optocoupler saturation during output overvoltage faults. Use Value: 37.5 V clamping voltage aligns precisely with 33 V rail + 13.6% margin, allowing clean shutdown signaling without damaging feedback components. |
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 PPPM, same VWM/VC, SMB package (smaller footprint, lower thermal mass) | Limited to lower-energy transients (e.g., ESD, contact discharge); not rated for IEC 61000-4-5 line surges | Select when board space is constrained and threat level is ≤500 W; verify thermal performance under repeated pulsing. |
| 1.5KE33CA | 1500 W PPPM, axial DO-201 package, higher RθJA (~100 °C/W), slower response due to wirebond inductance | Requires through-hole mounting; unsuitable for automated SMT lines or high-frequency transient suppression | Choose only for legacy through-hole designs or cost-sensitive non-automated production; avoid in new SMT automotive designs. |
Compared with SMBJ33CA and 1.5KE33CA, SM15T33CA-M3/9AT delivers identical 33 V clamping performance in a surface-mount SMC package optimized for automotive and industrial SMT assembly, with verified 1500 W surge capability and halogen-free compliance required for Tier 1 supply chains.
Availability
SM15T33CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM15T33CA-M3/9AT 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 leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability and AEC-Q101 qualification.
The SM15T Series was developed specifically for high-power transient suppression in automotive and industrial environments where 1500 W surge immunity, bidirectional symmetry, and halogen-free compliance are mandatory design requirements.
FAQ
What is the clamping voltage of SM15T33CA-M3/9AT at its rated peak pulse current?
The SM15T33CA-M3/9AT has a maximum clamping voltage (VC) of 37.5 V at 33 A peak pulse current (IPPM) under the standard 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 defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T33CA-M3/9AT maintains this clamping performance across its full operating temperature range.
Is SM15T33CA-M3/9AT suitable for automotive applications?
Yes, SM15T33CA-M3/9AT is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the M3/9AT variant is halogen-free and RoHS-compliant commercial grade. For automotive use, specify SM15T33CAHM3_X (e.g., SM15T33CAHM3_A/I) to obtain full AEC-Q101 qualification. The SM15T33CA-M3/9AT shares identical electrical specs and SMC packaging but lacks formal automotive qualification documentation.
What does the "CA" suffix indicate in SM15T33CA-M3/9AT?
The "CA" suffix in SM15T33CA-M3/9AT denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional "A" variants that require correct polarity installation, the SM15T33CA-M3/9AT has no cathode marking and functions identically regardless of orientation in the circuit. This makes the SM15T33CA-M3/9AT ideal for AC-coupled or differential signal paths.
How does the M3 suffix affect SM15T33CA-M3/9AT's compliance status?
The "M3" suffix in SM15T33CA-M3/9AT indicates halogen-free, RoHS-compliant construction meeting JEDEC J-STD-201 Class 2 whisker resistance and UL 94 V-0 flammability standards. It replaces brominated flame retardants with alternative chemistries while maintaining thermal and mechanical performance. The SM15T33CA-M3/9AT is certified for commercial-grade applications and supports environmental compliance in consumer, industrial, and select automotive supply chains where halogen-free materials are mandated.
What is the thermal resistance of SM15T33CA-M3/9AT, and how does it impact layout?
The SM15T33CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads. This value assumes natural convection cooling; reducing pad size or adding thermal vias lowers effective RθJA. Layout must allocate sufficient copper area to maintain junction temperature below +150 °C during repetitive surges, especially in enclosed industrial enclosures. The SM15T33CA-M3/9AT's thermal performance directly affects its ability to sustain multiple transient events without degradation.
SM15T33CA-M3/9AT 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-M3/9AT FAQ
1.How can I place an order for SM15T33CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33CA-M3/9AT 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-M3/9AT reliable?
The price and inventory of SM15T33CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T33CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T33CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33CA-M3/9AT?
SM15T33CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33CA-M3/9AT 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-M3/9AT?
For technical support, including SM15T33CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33CA-M3/9AT requirements.
6.How does Aetrix verify that SM15T33CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T33CA-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T33CA-M3/9AT?
All SM15T33CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33CA-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for SM15T33CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33CA-M3/9AT Tags
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