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Vishay General Semiconductor - Diodes Division 1.5SMC33CA-M3/57T
- Part No.:
- 1.5SMC33CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33CA-M3/57T.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,284
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Product details
Overview
1.5SMC33CA-M3/57T from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, rated for 1500 W peak pulse power with 10/1000 μs waveform, 33 V standoff voltage (VWM), and 45.7 V maximum clamping voltage (VC) at 32.8 A peak pulse current - deployed for surge protection on automotive sensor signal lines, industrial I/O ports, and telecom interface circuits.
For engineers reviewing the 1.5SMC33CA-M3/57T datasheet, 1.5SMC33CA-M3/57T pinout, 1.5SMC33CA-M3/57T application, or 1.5SMC33CA-M3/57T equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal derating curves, RoHS-compliant halogen-free construction, and AEC-Q101 qualification path - all critical for ESD and lightning transient design in safety-critical embedded systems.
Technical Context
The 1.5SMC33CA-M3/57T operates as a symmetrical avalanche diode, exhibiting identical breakdown (VBR = 37.1–41.0 V) and clamping characteristics in both directions, enabling robust protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable leakage (<1.0 μA at 28.2 V) and fast response time (<1.0 ns) to transients.
Thermally, it features RθJA = 75 °C/W and RθJL = 15 °C/W, with derating beginning above TA = 25 °C per Figure 2; maximum junction temperature is 150 °C, and it meets MSL Level 1 (260 °C peak reflow). The device is qualified to AEC-Q101 when ordered with HM3 suffix variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 28.2 V - Maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 37.1–41.0 V at 1.0 mA - Symmetrical avalanche onset range in both directions; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 45.7 V at IPPM = 32.8 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 1500 W - Sustained energy absorption capability under standardized 10/1000 μs waveform; validates compliance with IEC 61000-4-5 Level 4. |
| ID (Reverse Leakage) | <1.0 μA at VWM - Minimal standby current; preserves signal integrity and battery life in always-on interfaces. |
| TJ max | 150 °C - Maximum allowable junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Surface-mount outline with 8.0 mm × 8.0 mm copper pad requirement; enables automated assembly and thermal management. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 compliant. Bidirectional configuration has no polarity marking; terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as input/output for transient energy; no polarity dependency - simplifies PCB layout for differential or AC signals. |
| Terminal 2 | Anode / Cathode (bidirectional) | Paired terminal completes symmetrical clamping path; requires equal trace impedance to ground or rail for balanced protection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal lines without external polarity management. |
| 1500 W peak pulse rating | Meets IEC 61000-4-5 surge immunity requirements for industrial and automotive electronics up to Level 4. |
| Halogen-free, RoHS-compliant (M3 suffix) | Complies with environmental regulations for global OEM supply chains and eliminates corrosive off-gassing in sealed enclosures. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD, relay bounce), improving protection fidelity. |
| Fast response time (<1 ns) | Activates before sensitive ICs (e.g., CAN transceivers, ADC inputs) experience damaging overvoltage stress. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and temperature/pressure sensor outputs from load dump and inductive switching transients in engine control units. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal line and ground to clamp ±45.7 V surges while preserving DC bias and signal bandwidth. Use Value: Prevents latch-up or gate oxide damage in microcontroller GPIOs and analog front-end amplifiers exposed to automotive-grade transients. |
Use Scenario: Safeguarding 4–20 mA current loop inputs in programmable logic controllers against field-wiring faults and lightning-induced surges. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA) bidirectional suppressor shunting transient energy before it reaches precision op-amps and ADCs. Use Value: Maintains measurement accuracy and avoids false triggering during 1.5 kV/0.5 J surge events per IEC 61000-4-5. |
| Telecom Line Card Protection | Consumer USB Port ESD Guard |
Use Scenario: Shielding Ethernet PHY interfaces and DSL line drivers from induced surges on outdoor cabling in network access equipment. IC Role / Device Role / Timing Role: High-power (1500 W) clamping device mounted at board edge, coordinated with gas discharge tubes for staged protection. Use Value: Limits transient voltage to ≤45.7 V during 10/1000 μs surges, preventing damage to magnetics and PHY ICs rated for 3.3 V or 5 V operation. |
Use Scenario: Secondary-level ESD protection on USB 2.0 data lines (D+/D−) in set-top boxes and smart displays, complementing internal IC-level clamps. IC Role / Device Role / Timing Role: Fast-response (sub-ns) bidirectional suppressor absorbing >15 kV HBM ESD pulses per IEC 61000-4-2. Use Value: Reduces system-level ESD failure rate by clamping transients before they propagate into USB transceivers or SoCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA-T3 | Lower PPPM (600 W), same VWM/VC, SMB package (smaller footprint, higher RθJA = 90 °C/W) | Suitable for space-constrained consumer designs with lower surge exposure; not recommended for automotive or industrial Level 4 testing. | Select when board area is critical and peak surge energy is ≤600 W; verify thermal margin with reduced copper pad area. |
| 1.5KE33CA | Through-hole DO-201 package, identical VWM/VC/PPPM, higher IFSM (200 A), but incompatible with SMT assembly | Used in legacy industrial power supplies where manual assembly or high-reliability through-hole mounting is required. | Choose only for through-hole redesigns or prototyping; not drop-in compatible due to package and reflow profile mismatch. |
Compared with SMBJ33CA-T3 and 1.5KE33CA, the 1.5SMC33CA-M3/57T uniquely balances 1500 W surge capacity, SMC surface-mount compatibility, halogen-free compliance, and AEC-Q101 qualification readiness - making it optimal for volume automotive and industrial PCBs requiring automated assembly and regulatory alignment.
Availability
1.5SMC33CA-M3/57T is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog inputs, telecom line cards, and consumer USB port protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1.5SMC33CA-M3/57T 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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The 1.5SMC Series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against lightning, ESD, and inductive switching is non-negotiable.
FAQ
What is the clamping voltage of the 1.5SMC33CA-M3/57T at its rated peak pulse current?
The 1.5SMC33CA-M3/57T clamps to a maximum of 45.7 V at its specified peak pulse current of 32.8 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 and Table on page 2 of Vishay document 88303, and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the 1.5SMC33CA-M3/57T suitable for automotive applications?
Yes - the 1.5SMC33CA-M3/57T is halogen-free and RoHS-compliant (M3 suffix), and belongs to the AEC-Q101-qualified 1.5SMC family. While the base M3 variant itself is commercial-grade, Vishay offers HM3-suffixed versions (e.g., 1.5SMC33CAHM3_A/H) that are fully AEC-Q101 qualified. Engineers selecting 1.5SMC33CA-M3/57T for automotive use should confirm qualification status via ordering code and consult Vishay's automotive-grade datasheet revision.
How does the bidirectional nature of the 1.5SMC33CA-M3/57T affect its placement on a PCB?
The 1.5SMC33CA-M3/57T has no polarity marking and functions identically in both directions, so it can be placed across any two nodes requiring symmetrical overvoltage protection - such as differential pairs (RS-485, CAN), AC-coupled signals, or floating sensor bridges. Unlike unidirectional TVS diodes, no orientation check is needed during placement, reducing assembly errors and enabling flexible routing in dense layouts.
What is the thermal resistance of the 1.5SMC33CA-M3/57T, and how does it impact power dissipation?
The 1.5SMC33CA-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pads. At ambient temperatures above 25 °C, its 6.5 W steady-state power dissipation must be derated per Figure 2 - e.g., at 85 °C ambient, usable PD drops to ~4.0 W. This directly constrains continuous leakage current and dictates minimum copper area for thermal reliability.
Does the 1.5SMC33CA-M3/57T meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes - the 1.5SMC33CA-M3/57T meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This allows unlimited floor life and standard lead-free reflow profiles without baking, simplifying manufacturing logistics for high-volume SMT lines and eliminating moisture-related popcorning risks during assembly.
1.5SMC33CA-M3/57T 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-M3/57T FAQ
1.How can I place an order for 1.5SMC33CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33CA-M3/57T 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 1.5SMC33CA-M3/57T reliable?
The price and inventory of 1.5SMC33CA-M3/57T 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-M3/57T is usually 5 days.
3.What payment methods are accepted for 1.5SMC33CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33CA-M3/57T?
1.5SMC33CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33CA-M3/57T 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 1.5SMC33CA-M3/57T?
For technical support, including 1.5SMC33CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33CA-M3/57T requirements.
6.How does Aetrix verify that 1.5SMC33CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33CA-M3/57T 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 1.5SMC33CA-M3/57T meets industry standards.
7.What is the process for return or replacement of 1.5SMC33CA-M3/57T?
All 1.5SMC33CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33CA-M3/57T, 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 1.5SMC33CA-M3/57T part is unused and in its original packaging.
Return procedure for 1.5SMC33CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33CA-M3/57T Tags
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