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Vishay General Semiconductor - Diodes Division 1.5SMC33CA-E3/9AT
- Part No.:
- 1.5SMC33CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33CA-E3/9AT.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,367
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Product details
Overview
1.5SMC33CA-E3/9AT 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 V minimum breakdown voltage (VBR), 45.7 V maximum clamping voltage (VC) at 32.8 A peak pulse current (IPPM), 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-E3/9AT datasheet, 1.5SMC33CA-E3/9AT pinout, 1.5SMC33CA-E3/9AT application, or 1.5SMC33CA-E3/9AT equivalent, key selection criteria include bidirectional clamping performance, SMC (DO-214AB) package thermal derating behavior, junction temperature limits up to +150 °C, and compliance with AEC-Q101 when specified with HE3/HM3 suffixes.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping characteristics in forward and reverse directions - critical for AC-coupled or floating signal paths. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), enabling effective suppression of ESD (IEC 61000-4-2) and lightning-induced transients (IEC 61000-4-5).
The device is rated for 1500 W peak pulse power under standardized 10/1000 μs waveform conditions, with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W - confirming suitability for PCB layouts using 8.0 mm × 8.0 mm copper pads per terminal. It meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 33 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR (Breakdown) | 31.4–34.7 V at 1.0 mA - Confirmed avalanche onset range; ensures predictable turn-on during transient events. |
| VC (Clamping) | 45.7 V at 32.8 A - Peak voltage seen by protected circuit during full-rated surge; determines downstream component stress. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 μs waveform; validates protection level against lightning surges. |
| ID (Leakage) | <1.0 μA at 33 V - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss. |
| TJ max. | +150 °C - Maximum junction temperature rating; enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One side of symmetrical junction; accepts surge current in either direction without polarity dependency. |
| Cathode | Transient current entry (positive polarity) | Other side of symmetrical junction; completes bidirectional conduction path during voltage excursions beyond ±VWM. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both polarities - eliminates need for polarity-aware layout in AC or differential signal paths. |
| 1500 W peak pulse rating | Validated with 10/1000 μs waveform at 0.01% duty cycle - meets IEC 61000-4-5 Level 4 surge immunity requirements. |
| Glass-passivated junction | Stable electrical parameters over lifetime and temperature; reduces parameter drift vs. epoxy-passivated alternatives. |
| MSL Level 1 moisture sensitivity | Zero floor life limitation - can be stored indefinitely before reflow; no baking required prior to assembly. |
| AEC-Q101 qualification option | Available with HE3/HM3 suffixes - validated for automotive-grade reliability including temperature cycling and HTRB testing. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/FlexRay transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from 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 sensitive analog front-end or communication IC. Use Value: Limits transient voltage to ≤45.7 V during 32.8 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V automotive microcontrollers and signal conditioners. |
Use Scenario: Safeguarding PLC digital input channels exposed to inductive switching noise from solenoids, relays, and motor drives. IC Role / Device Role / Timing Role: Primary overvoltage suppressor on 24 V DC input lines, mounted adjacent to terminal block to minimize inductance in surge path. Use Value: Clamps 1 kV/500 A transients (per IEC 61000-4-4) within nanoseconds while maintaining <1.0 μA leakage at nominal 24 V - preserving logic threshold margins. |
| Telecom Line Interface | Consumer USB/Display Port ESD Protection |
Use Scenario: Shielding RS-485/RS-422 data lines in base station backhaul equipment against lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Differential pair protector with matched bidirectional clamping on A/B lines, referenced to local ground plane. Use Value: Symmetric 45.7 V clamping ensures balanced voltage excursion across differential receivers, avoiding common-mode-to-differential conversion errors. |
Use Scenario: Front-line ESD protection for USB 2.0 D+/D− and DisplayPort AUX CH lines in laptops and docking stations. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 200 pF typical at 0 V) placed immediately after connector to absorb ±8 kV contact discharge per IEC 61000-4-2. Use Value: Sub-1 ns response time and 33 V VWM preserve signal rise/fall times while preventing ESD-induced reset or data corruption in high-speed PHYs. |
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 | Same VWM/VBR/VC ratings but lower PPPM (600 W); SMB package (smaller footprint, higher RθJA = 85 °C/W). | Preferred where board space is constrained and surge threat level is limited to IEC 61000-4-2 only - not suitable for lightning-level 10/1000 μs events. | Select SMBJ33CA only if peak surge current remains ≤13 A and thermal management cannot accommodate SMC pad area. |
| 1.5KE33CA | Through-hole TO-204AA (DO-15) package; identical electrical specs but higher mounting inductance and no MSL Level 1 rating. | Used in legacy industrial power supplies or repair scenarios where SMT is unavailable; incompatible with automated assembly lines requiring RoHS-compliant reflow. | Choose 1.5KE33CA only for hand-soldered prototypes or field-replacement units where SMC placement infrastructure is absent. |
Compared with SMBJ33CA and 1.5KE33CA, the 1.5SMC33CA-E3/9AT delivers superior surge robustness (1500 W vs. 600 W or 1500 W with higher inductance), standardized SMT manufacturability, and guaranteed MSL Level 1 handling - making it the preferred choice for new automotive and industrial designs requiring production scalability and long-term supply stability.
Availability
1.5SMC33CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O conditioning, and telecom line interface applications requiring stable component supply, RoHS compliance, and traceable sourcing.
Supply support for 1.5SMC33CA-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 leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive qualification.
The 1.5SMC Series was engineered specifically for high-energy transient suppression in harsh environments - targeting design-in across automotive, industrial automation, and communications infrastructure where failure modes must be mitigated without compromising signal fidelity.
FAQ
What is the clamping voltage of the 1.5SMC33CA-E3/9AT under full-rated surge conditions?
The 1.5SMC33CA-E3/9AT exhibits a maximum clamping voltage (VC) of 45.7 V when subjected to its rated peak pulse current of 32.8 A with a 10/1000 μs waveform. This value is measured per standard test conditions defined in the Vishay datasheet (Document Number: 88303), and represents the highest voltage the protected circuit will experience during worst-case transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the 1.5SMC33CA-E3/9AT suitable for automotive applications?
The 1.5SMC33CA-E3/9AT itself is RoHS-compliant and commercial-grade; however, Vishay offers AEC-Q101 qualified versions under ordering codes like 1.5SMC33CAHE3_A. The -E3/9AT variant does not carry AEC-Q101 certification, so for automotive production use, engineers must specify the HE3 or HM3 suffix. The 1.5SMC33CA-E3/9AT remains appropriate for non-safety-critical automotive prototyping or aftermarket systems where formal qualification is not mandated.
What is the thermal resistance of the 1.5SMC33CA-E3/9AT, and how does it affect PCB layout?
The 1.5SMC33CA-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value assumes optimal thermal land pattern per Vishay's recommended layout. Reducing pad size or omitting thermal vias increases RθJA, potentially causing junction temperature to exceed +150 °C during repetitive surges - so adherence to the documented pad dimensions is essential for reliable 1500 W pulse handling in the 1.5SMC33CA-E3/9AT.
Does the 1.5SMC33CA-E3/9AT have polarity markings, and how is it oriented on the PCB?
No - the 1.5SMC33CA-E3/9AT is a bidirectional TVS and carries no polarity marking on its SMC (DO-214AB) package. Unlike unidirectional variants (e.g., 1.5SMC33A), it lacks a cathode band. The device functions identically regardless of orientation, simplifying placement and eliminating risk of reverse installation. This symmetry is inherent to its dual-junction construction and confirmed in Vishay's "DEVICES FOR BIDIRECTION APPLICATIONS" section.
What is the maximum leakage current of the 1.5SMC33CA-E3/9AT at its rated standoff voltage?
The 1.5SMC33CA-E3/9AT guarantees a maximum reverse leakage current (ID) of 1.0 μA at its rated standoff voltage (VWM) of 33 V, measured at TA = 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor circuits and avoids unnecessary power drain in battery-operated systems - a key differentiator from older TVS families with leakage in the tens of microamps.
1.5SMC33CA-E3/9AT 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-E3/9AT FAQ
1.How can I place an order for 1.5SMC33CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33CA-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 1.5SMC33CA-E3/9AT reliable?
The price and inventory of 1.5SMC33CA-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 1.5SMC33CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC33CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33CA-E3/9AT?
1.5SMC33CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33CA-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 1.5SMC33CA-E3/9AT?
For technical support, including 1.5SMC33CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33CA-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC33CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33CA-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 1.5SMC33CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC33CA-E3/9AT?
All 1.5SMC33CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33CA-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 1.5SMC33CA-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC33CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33CA-E3/9AT Tags
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