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Vishay General Semiconductor - Diodes Division 1.5SMC33CA-M3/9AT
- Part No.:
- 1.5SMC33CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33CA-M3/9AT.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,816
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Product details
Overview
1.5SMC33CA-M3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 45.7 V maximum clamping voltage at 32.8 A peak pulse current, and 1500 W peak pulse power capability with a 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the 1.5SMC33CA-M3/9AT datasheet, 1.5SMC33CA-M3/9AT pinout, 1.5SMC33CA-M3/9AT application, or 1.5SMC33CA-M3/9AT equivalent, key selection criteria include bidirectional clamping performance, SMC (DO-214AB) package thermal derating behavior, junction temperature limits up to +150 °C, and halogen-free RoHS compliance per M3 suffix.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering consistent clamping during positive and negative transients without polarity marking. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
The device is rated for 1500 W peak pulse power under 10/1000 μs waveform conditions, with thermal resistance of 75 °C/W (junction-to-ambient) on standard 8.0 mm × 8.0 mm copper pads. It meets MSL Level 1 per J-STD-020 and supports reflow soldering up to 260 °C peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown) | 36.7–40.6 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events. |
| VC (Clamping) | 45.7 V at 32.8 A - Peak voltage seen by protected circuit during 10/1000 μs surge; critical for downstream IC survivability. |
| PPPM | 1500 W - Surge energy handling capacity under standardized transient waveform; enables single-device protection for high-energy threats. |
| TJ max. | +150 °C - Maximum junction temperature rating supporting operation 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; optimized for automated placement and thermal pad layout. |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix); meets UL 94 V-0 flammability and JESD201 Class 2 whisker resistance. |
Pinout & Package
Package: SMC (DO-214AB), bidirectional configuration - no polarity marking; symmetrical terminals function as interchangeable anode/cathode pair depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Interchangeable terminal; conducts during negative or positive transients relative to Terminal 2 - no fixed polarity. |
| Terminal 2 | Anode / Cathode (bidirectional) | Interchangeable terminal; completes symmetrical clamping path - used across AC lines or floating signal pairs. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection on AC-coupled or differential signal paths without polarity concerns. |
| 1500 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out with thermal pads. |
| Low clamping ratio (VC/VBR ≈ 1.15) | Minimizes protected circuit stress by limiting overshoot - critical for 3.3 V/5 V logic and analog front-ends. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile use without baking - reduces manufacturing overhead. |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance requirements for global industrial and automotive OEM programs. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across signal/power pins to shunt transient energy before it reaches sensitive ASICs. Use Value: Maintains signal integrity during 100 V/50 ms load dump events while surviving repeated exposure per AEC-Q101 qualification. |
Use Scenario: Safeguarding 24 V DC digital input modules against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Primary overvoltage suppressor at connector entry point, coordinating with upstream fuses and downstream filtering. Use Value: Limits clamped voltage to ≤45.7 V, ensuring compatibility with 30 V-rated input buffers and preventing latch-up in microcontrollers. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Secondary-side surge protection on Ethernet PHY power rails and RS-485 data lines exposed to lightning-induced coupling. IC Role / Device Role / Timing Role: Fast-response shunt element that activates within picoseconds to clamp common-mode transients. Use Value: Achieves <1.0 μA leakage at 33 V, preserving low-power sleep modes while delivering 1500 W surge handling. |
Use Scenario: Input-stage transient suppression on AC-DC adapter primary-side rectifier outputs and secondary-side 12 V/5 V rails. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed after bulk capacitor to absorb switch-mode noise and external surges. Use Value: Withstands 200 A non-repetitive forward surge (IFSM), supporting robustness against inrush and fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Lower peak pulse power (600 W), same VWM/VBR/VC ratings, SMB package (smaller footprint, higher RθJA). | Preferred for space-constrained consumer PCBs where 600 W surge margin suffices; not suitable for automotive load dump. | Select SMBJ33CA only if board area is critical and surge threat level is limited to IEC 61000-4-2/4-4. |
| 1.5KE33CA | Through-hole DO-15 package, identical electrical specs, higher mechanical robustness but incompatible with SMT assembly. | Used in legacy industrial power supplies requiring manual repairability and higher vibration tolerance. | Choose 1.5KE33CA only when through-hole assembly is mandated or thermal mass from lead-frame improves long-pulse dissipation. |
Compared with SMBJ33CA and 1.5KE33CA, the 1.5SMC33CA-M3/9AT delivers optimal balance of 1500 W surge capacity, SMT manufacturability, and halogen-free compliance - making it the preferred choice for new automotive and industrial designs requiring AEC-Q101 alignment and high-volume automated production.
Availability
1.5SMC33CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor systems, industrial programmable logic controllers, and telecom infrastructure equipment requiring stable component supply, halogen-free compliance, and AEC-Q101-aligned reliability.
Supply support for 1.5SMC33CA-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, MOSFETs, optoelectronics, and passive components with emphasis on high-reliability and application-specific performance.
The 1.5SMC Series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, consistency, and regulatory compliance are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC33CA-M3/9AT under a 10/1000 μs surge?
The 1.5SMC33CA-M3/9AT exhibits a maximum clamping voltage (VC) of 45.7 V when subjected to its rated peak pulse current of 32.8 A under a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The 1.5SMC33CA-M3/9AT maintains this clamping performance bidirectionally.
Is the 1.5SMC33CA-M3/9AT suitable for automotive applications?
Yes, the 1.5SMC33CA-M3/9AT is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the M3/9AT variant itself is commercial-grade and not AEC-Q101 certified. For automotive use, engineers must specify 1.5SMC33CAHM3_X (e.g., HM3_A or HM3_B) to obtain the qualified version. The 1.5SMC33CA-M3/9AT retains all electrical and thermal specs but lacks formal automotive qualification documentation.
What does the "CA" suffix indicate in 1.5SMC33CA-M3/9AT?
The "CA" suffix in 1.5SMC33CA-M3/9AT denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional "A" variants, the CA version has no cathode band marking and functions identically regardless of voltage polarity applied across its terminals. This makes the 1.5SMC33CA-M3/9AT ideal for AC lines, differential signals, and floating grounds.
What is the thermal resistance of the 1.5SMC33CA-M3/9AT?
The 1.5SMC33CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Its junction-to-lead resistance (RθJL) is 15 °C/W. These values directly impact power derating above 25 °C ambient and must be applied using Fig. 2 from the Vishay datasheet (Document Number: 88303) to ensure safe operation at elevated temperatures.
Does the 1.5SMC33CA-M3/9AT require special PCB layout considerations?
Yes - to achieve rated 1500 W surge performance, the 1.5SMC33CA-M3/9AT must be mounted on minimum 8.0 mm × 8.0 mm copper pads per terminal, as specified in the Vishay datasheet. Narrow traces or insufficient copper reduce heat dissipation and lower actual surge capability. Additionally, placement should minimize trace inductance between the 1.5SMC33CA-M3/9AT and protected node - ideally within 5 mm - to preserve fast clamping response.
1.5SMC33CA-M3/9AT 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:
- -
- 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):
- 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)
1.5SMC33CA-M3/9AT FAQ
1.How can I place an order for 1.5SMC33CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33CA-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 1.5SMC33CA-M3/9AT reliable?
The price and inventory of 1.5SMC33CA-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 1.5SMC33CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC33CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33CA-M3/9AT?
1.5SMC33CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33CA-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 1.5SMC33CA-M3/9AT?
For technical support, including 1.5SMC33CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33CA-M3/9AT requirements.
6.How does Aetrix verify that 1.5SMC33CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33CA-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 1.5SMC33CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC33CA-M3/9AT?
All 1.5SMC33CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33CA-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 1.5SMC33CA-M3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC33CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33CA-M3/9AT Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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