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Vishay General Semiconductor - Diodes Division 1.5SMC33A-E3/9AT
- Part No.:
- 1.5SMC33A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33A-E3/9AT.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,295
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Product details
Overview
1.5SMC33A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 33 V breakdown voltage (VBR = 31.4–34.7 V at 1.0 mA), 28.2 V stand-off voltage (VWM), clamps to ≤45.7 V at 32.8 A peak pulse current, and delivers 1500 W peak pulse power with a 10/1000 µs waveform - used in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the 1.5SMC33A-E3/9AT datasheet, 1.5SMC33A-E3/9AT pinout, 1.5SMC33A-E3/9AT application, or 1.5SMC33A-E3/9AT equivalent, key selection criteria include unidirectional polarity, SMC (DO-214AB) package compatibility, clamping performance under repetitive transients, and AEC-Q101 qualification status (note: E3 suffix denotes RoHS-compliant commercial grade, not automotive-qualified).
Technical Context
This TVS operates as a voltage-clamped shunt protector: when reverse voltage exceeds VWM (28.2 V), it avalanches near VBR (31.4–34.7 V) and limits transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 µA at VWM).
Designed for automated SMT assembly, it uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, supports MSL Level 1 reflow (260 °C peak), and achieves thermal resistance of 75 °C/W (junction-to-ambient) on standard 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1.0 mA - defines precise avalanche initiation window for repeatable clamping onset |
| VWM | 28.2 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | ≤45.7 V at 32.8 A - peak clamped voltage during 1500 W transient, critical for downstream IC survival |
| PPPM | 1500 W (10/1000 µs) - surge handling capacity for lightning and inductive switching events |
| IPPM | 32.8 A - maximum non-repetitive surge current the device safely clamps without degradation |
| TJ max | +150 °C - enables operation in under-hood automotive and high-temperature industrial environments |
| Package | SMC (DO-214AB) - industry-standard 2-pin surface-mount outline with cathode band marking |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads; cathode indicated by a band on the body; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to circuit ground or lowest potential point to enable shunt clamping path |
| Cathode | Protected line input | Connected to the line being protected (e.g., 24 V rail or CAN_H); band-marked end |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Withstands high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without failure |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during clamping, reducing stress on downstream MOSFETs or MCUs |
| MSL Level 1 moisture sensitivity | Enables direct placement into high-temperature reflow without baking or special handling |
| Glass-passivated junction | Ensures long-term stability of VBR and low leakage (<1 µA) across temperature and life cycle |
| RoHS-compliant (E3 suffix) | Meets global environmental compliance requirements for commercial and industrial applications |
Applications
| Automotive Sensor Power Rail Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines feeding ABS wheel speed sensors exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VIN and GND to clamp transients above 28.2 V. Use Value: Limits clamped voltage to ≤45.7 V, ensuring sensor ICs rated for 48 V absolute maximum survive ISO 16750-2 load dump events. |
Use Scenario: Safeguarding 24 V digital inputs on programmable logic controllers subject to field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on each input channel, absorbing fast-rising transients before they reach optocoupler input stages. Use Value: 32.8 A peak pulse current capability handles 1 kV/500 Ω surge test (IEC 61000-4-5) without degradation. |
| Telecom Line Interface Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding RS-485 transceiver power pins in building automation gateways against EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VCC rail, coordinated with secondary TVS on data lines. Use Value: Fast response time and low incremental surge resistance minimize let-through energy to sensitive PHY circuitry. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in smart washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Mounted across motor terminals or on H-bridge supply rail to absorb back-EMF spikes. Use Value: 1500 W rating accommodates repeated switching surges up to 100 kHz duty cycle without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A-E3/52T | Lower PPPM (600 W), same VBR/VWM, SMB (DO-214AA) package - 30% smaller footprint | Not suitable for 1500 W surge events; limited to lower-energy IEC 61000-4-4/5 applications | Select only if board space is constrained and surge threat level is ≤600 W. |
| 1.5SMC33CA-E3/9AT | Bidirectional variant; identical VBR/VC/PPPM, but symmetric clamping in both polarities | Required for AC-coupled or differential signal lines (e.g., RS-485, CAN) where polarity reversal occurs | Choose when protecting bidirectional buses; not interchangeable with unidirectional 1.5SMC33A-E3/9AT without circuit review. |
Compared with SMBJ33A-E3/52T, the 1.5SMC33A-E3/9AT provides 2.5× higher surge power margin for harsh environments; versus 1.5SMC33CA-E3/9AT, it offers optimized clamping for DC rails but cannot protect AC signals without polarity reversal risk.
Availability
1.5SMC33A-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom interface designs requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for 1.5SMC33A-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, and protection devices with emphasis on reliability, ruggedness, and automotive-grade validation.
The 1.5SMC Series was engineered for high-power transient suppression in space-constrained SMT applications, targeting automotive, industrial, and telecom systems where robustness against ISO 7637 and IEC 61000-4-x threats is mandatory.
FAQ
What is the clamping voltage of the 1.5SMC33A-E3/9AT at its rated peak pulse current?
The 1.5SMC33A-E3/9AT clamps to a maximum of 45.7 V when subjected to its rated peak pulse current of 32.8 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 represents the upper limit of voltage seen by downstream circuitry during a full-power transient event. The 1.5SMC33A-E3/9AT maintains this clamping performance across its specified operating temperature range.
Is the 1.5SMC33A-E3/9AT AEC-Q101 qualified?
No, the 1.5SMC33A-E3/9AT is not AEC-Q101 qualified. Its E3 suffix indicates RoHS-compliant commercial-grade construction. For automotive-qualified versions, Vishay offers the 1.5SMC33AHE3_A variant (with HE3 suffix), which carries AEC-Q101 certification and is marked with revision code "A". The 1.5SMC33A-E3/9AT remains suitable for industrial and consumer applications where automotive qualification is not required.
What does the "/9AT" suffix mean in 1.5SMC33A-E3/9AT?
The "/9AT" suffix denotes packaging configuration: 3500 units per 13-inch diameter plastic tape-and-reel. This format supports high-volume automated pick-and-place assembly. The base part number 1.5SMC33A-E3 specifies unidirectional polarity, 33 V nominal breakdown, RoHS-compliant matte tin plating, and SMC (DO-214AB) package. The 1.5SMC33A-E3/9AT is fully compatible with standard SMC footprint layouts and reflow profiles.
How does the 1.5SMC33A-E3/9AT compare to SMAJ33A in terms of surge capability?
The 1.5SMC33A-E3/9AT delivers 1500 W peak pulse power (10/1000 µs), whereas the SMAJ33A is rated for 400 W. This 3.75× higher surge rating allows the 1.5SMC33A-E3/9AT to handle more severe transients such as ISO 7637-2 Pulse 5a (load dump) without degradation. Both share the same VBR range, but the 1.5SMC33A-E3/9AT's larger SMC package enables superior thermal dissipation and higher IPPM (32.8 A vs. ~12 A for SMAJ33A).
Can the 1.5SMC33A-E3/9AT be used in bidirectional signal protection?
No - the 1.5SMC33A-E3/9AT is strictly unidirectional and must be oriented with cathode toward the protected line and anode to ground. Using it on AC or differential signals risks forward conduction and failure during negative half-cycles. For bidirectional protection, select the 1.5SMC33CA-E3/9AT, which has symmetrical breakdown in both directions and no polarity marking. The 1.5SMC33A-E3/9AT is intended only for DC rail or single-polarity signal line protection.
1.5SMC33A-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:
- 1
- Bidirectional Channels:
- -
- 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)
1.5SMC33A-E3/9AT FAQ
1.How can I place an order for 1.5SMC33A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33A-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 1.5SMC33A-E3/9AT reliable?
The price and inventory of 1.5SMC33A-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 1.5SMC33A-E3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC33A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33A-E3/9AT?
1.5SMC33A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33A-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 1.5SMC33A-E3/9AT?
For technical support, including 1.5SMC33A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33A-E3/9AT requirements.
6.How does Aetrix verify that 1.5SMC33A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33A-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 1.5SMC33A-E3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC33A-E3/9AT?
All 1.5SMC33A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33A-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 1.5SMC33A-E3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC33A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33A-E3/9AT Tags
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