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Vishay General Semiconductor - Diodes Division 1.5SMC33CAHE3/9AT
- Part No.:
- 1.5SMC33CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33CAHE3/9AT.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,406
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Product details
Overview
1.5SMC33CAHE3/9AT 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 (PPPM) with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the 1.5SMC33CAHE3/9AT datasheet, 1.5SMC33CAHE3/9AT pinout, 1.5SMC33CAHE3/9AT application, or 1.5SMC33CAHE3/9AT equivalent, key selection criteria include bidirectional clamping performance, AEC-Q101 qualification, SMC (DO-214AB) package thermal resistance (RθJL = 15 °C/W), and compliance with UL 497B surge protector classification.
Technical Context
This device operates as a voltage-clamped shunt protector: under transient overvoltage events exceeding its breakdown threshold, it rapidly switches to low-impedance conduction, diverting surge current away from downstream circuitry while limiting voltage across protected nodes to ≤45.7 V. Its bidirectional symmetry enables use on AC-coupled or floating lines without polarity concerns.
Engineered for automotive-grade reliability, the 1.5SMC33CAHE3/9AT integrates glass-passivated junction technology, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and delivers stable clamping up to 150 °C junction temperature. Its 1500 W PPPM rating is validated with 10/1000 μs waveform at 0.01% duty cycle on 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 33 V - Maximum continuous reverse operating voltage before significant leakage; defines normal operating margin. |
| VBR (Breakdown) | 31.4–34.7 V at 1 mA - Voltage at which device enters avalanche conduction; ensures predictable turn-on during transients. |
| VC (Clamping) | 45.7 V at 32.8 A - Maximum voltage seen by protected circuit during 10/1000 μs surge; critical for IC-level survivability. |
| PPPM | 1500 W - Peak transient energy absorption capability; determines protection level against lightning or inductive spikes. |
| RθJL | 15 °C/W - Junction-to-leads thermal resistance; enables accurate PCB pad thermal design for sustained surge handling. |
| TJ max. | 150 °C - Maximum allowable junction temperature; supports operation in under-hood automotive environments. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking - symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on instantaneous polarity; no band marking required. |
| Terminal 2 | Anode / Cathode (bidirectional) | Electrically identical to Terminal 1; enables placement without orientation constraints on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating signal lines without external polarity management. |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body control, and ADAS sensor modules per JEDEC stress standards. |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surges when properly mounted on 8 mm × 8 mm copper pads. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD or relay bounce). |
| MSL Level 1 moisture sensitivity | Allows standard SMT reflow without baking; compatible with high-volume automated assembly. |
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 jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly at connector entry point to clamp transients before reaching interface ICs. Use Value: Limits induced voltage to ≤45.7 V during 1500 W surges, preventing damage to 3.3 V/5 V sensor signal conditioning circuits. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers against field-wiring faults and inductive kickback from solenoids. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact inputs, coordinated with upstream series impedance. Use Value: Absorbs repetitive 10/1000 μs surges up to 32.8 A while maintaining <1 μA leakage at 33 V, ensuring input logic integrity. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Shielding Ethernet PHY magnetics and PoE injectors from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), providing low-clamp refinement. Use Value: Clamps residual transients to 45.7 V within nanoseconds, protecting 100BASE-TX transformers rated for 50 V isolation. |
Use Scenario: Suppressing switching noise and output overvoltage events in 12 V/5 V wall adapters feeding USB-C PD or audio subsystems. IC Role / Device Role / Timing Role: Output-side TVS placed after DC-DC converter to protect downstream USB ports and codec ICs. Use Value: Maintains <1 μA reverse leakage at 33 V standby, avoiding quiescent current drain while delivering 1500 W surge immunity. |
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 specs but lower PPPM (600 W); SMB package (smaller footprint, higher RθJA = 110 °C/W). | Preferred for space-constrained consumer PCBs where 600 W surge margin suffices; not AEC-Q101 qualified. | Select when board area is critical and automotive qualification is unnecessary. |
| 1.5KE33CA | Through-hole DO-201 package; identical electrical specs but slower response due to higher parasitic inductance. | Suitable for legacy industrial power supplies with through-hole assembly; lacks MSL Level 1 and AEC-Q101 support. | Choose only for manual repair or non-automated production where SMT is unavailable. |
Compared with SMBJ33CA and 1.5KE33CA, the 1.5SMC33CAHE3/9AT uniquely combines AEC-Q101 qualification, 1500 W surge capacity, and SMC package thermal performance (RθJL = 15 °C/W), making it the optimal choice for high-reliability automotive and industrial SMT designs requiring full surge compliance.
Availability
1.5SMC33CAHE3/9AT is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC development, and telecom infrastructure projects requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant surge protection.
Supply support for 1.5SMC33CAHE3/9AT 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 high-reliability, high-power, and automotive-grade solutions.
The 1.5SMC Series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom applications where robustness, repeatable clamping, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC33CAHE3/9AT under a 10/1000 μs surge?
The 1.5SMC33CAHE3/9AT has a maximum clamping voltage (VC) of 45.7 V at 32.8 A peak pulse current (IPPM) when tested with a 10/1000 μs waveform. This value is measured under standardized conditions using 8.0 mm × 8.0 mm copper pads per terminal and represents the upper voltage limit imposed on protected circuitry during worst-case transient events.
Is the 1.5SMC33CAHE3/9AT suitable for automotive applications?
Yes, the 1.5SMC33CAHE3/9AT is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It undergoes rigorous stress testing including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT), making it appropriate for engine control units, body electronics, and ADAS sensor interfaces.
Does the 1.5SMC33CAHE3/9AT have polarity markings on the package?
No, the 1.5SMC33CAHE3/9AT is a bidirectional TVS diode in SMC (DO-214AB) package and carries no polarity marking. Both terminals are functionally identical - either can serve as anode or cathode depending on instantaneous voltage polarity - eliminating orientation constraints during automated placement.
What is the maximum operating temperature for the 1.5SMC33CAHE3/9AT?
The 1.5SMC33CAHE3/9AT has a maximum junction temperature (TJ max.) of +150 °C and an operating junction/storage temperature range of –65 °C to +150 °C. This rating supports deployment in under-hood automotive environments and industrial enclosures with elevated ambient temperatures.
How does the 1.5SMC33CAHE3/9AT differ from unidirectional variants like 1.5SMC33AHE3/9AT?
The 1.5SMC33CAHE3/9AT is bidirectional (denoted by "CA"), providing symmetrical clamping for AC or floating signals, whereas 1.5SMC33AHE3/9AT is unidirectional ("A") with a cathode band marking and optimized for DC-biased lines. Their VWM, VBR, and VC values are identical, but only the CA version suppresses transients regardless of polarity.
1.5SMC33CAHE3/9AT 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:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
1.5SMC33CAHE3/9AT FAQ
1.How can I place an order for 1.5SMC33CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33CAHE3/9AT 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 1.5SMC33CAHE3/9AT reliable?
The price and inventory of 1.5SMC33CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC33CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for 1.5SMC33CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33CAHE3/9AT?
1.5SMC33CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33CAHE3/9AT 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 1.5SMC33CAHE3/9AT?
For technical support, including 1.5SMC33CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33CAHE3/9AT requirements.
6.How does Aetrix verify that 1.5SMC33CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33CAHE3/9AT 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 1.5SMC33CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of 1.5SMC33CAHE3/9AT?
All 1.5SMC33CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33CAHE3/9AT, 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 1.5SMC33CAHE3/9AT part is unused and in its original packaging.
Return procedure for 1.5SMC33CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC33CAHE3/9AT Tags
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