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Vishay General Semiconductor - Diodes Division 1.5KE33CA-E3/51
- Part No.:
- 1.5KE33CA-E3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE33CA-E3/51.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:5,576
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Product details
Overview
1.5KE33CA-E3/51 from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 33 V breakdown voltage (VBR = 31.4–34.7 V at 1 mA), 1500 W peak pulse power (10/1000 µs), clamping voltage of 45.7 V at 32.8 A, and operates from –55 °C to +175 °C - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the 1.5KE33CA-E3/51 datasheet, 1.5KE33CA-E3/51 pinout, 1.5KE33CA-E3/51 application, or 1.5KE33CA-E3/51 equivalent, this page delivers verified electrical specs, JEDEC 1.5KE package details, bidirectional clamping behavior, thermal derating curves, and direct-fit alternatives for ESD/lightning surge protection design validation.
Technical Context
This device uses a glass-passivated silicon junction optimized for sub-nanosecond response (<1 ns) and low incremental surge resistance. Its bidirectional architecture enables symmetrical clamping across both polarities without external polarity management, supporting protection of AC-coupled or floating signal paths.
Rated for 1500 W peak pulse power under 10/1000 µs waveform with 0.01% duty cycle, it sustains repetitive transients while maintaining stable VC ≤ 45.7 V at IPPM = 32.8 A. Thermal resistance is RθJL = 15.4 °C/W (junction-to-lead), enabling reliable operation up to TJ = 175 °C with proper PCB copper heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1 mA - defines precise clamping onset threshold for bidirectional surge events |
| VWM | 28.2 V - maximum continuous working voltage before leakage exceeds 1 µA; sets safe operating margin below VBR |
| VC @ IPPM | 45.7 V at 32.8 A - peak clamped voltage during 1500 W transient; determines protected circuit's maximum stress level |
| PPPM | 1500 W - peak pulse power handling per 10/1000 µs waveform; validates suitability for lightning-induced surges (IEC 61000-4-5) |
| IPPM | 32.8 A - maximum non-repetitive surge current; used to size series impedance and verify PCB trace survivability |
| TJ range | –55 °C to +175 °C - supports under-hood automotive and industrial environments without derating loss |
| Package | JEDEC DO-201AD (Case Style 1.5KE) - axial-leaded, epoxy-molded, UL 94 V-0 rated; compatible with wave soldering (275 °C/10 s) |
Pinout & Package
1.5KE33CA-E3/51 is housed in a DO-201AD (Case Style 1.5KE) axial-leaded package with no polarity marking - consistent with bidirectional functionality. Leads are matte tin-plated and solderable per J-STD-002/JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Bidirectional terminal pair | Identical electrical behavior in both directions; no cathode band; installed without orientation constraint |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance (±5%) and long-term reliability under thermal cycling and humidity |
| 1500 W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4 kV) surge immunity when paired with appropriate series impedance |
| Sub-nanosecond response time | Clamps transients within 1 ns - faster than MOVs or polymer-based protectors, preserving signal integrity |
| AEC-Q101 qualified option available | HE3 suffix variants meet automotive-grade stress testing (e.g., 1.5KE33CAHE3_B); E3/51 is commercial grade |
| UL 94 V-0 molded epoxy case | Self-extinguishing housing prevents flame propagation in high-energy fault conditions |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., temperature, pressure) from load dump and inductive switching spikes in 12 V/24 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed directly at connector entry point to divert surge energy before reaching sensitive front-end amplifiers or microcontrollers. Use Value: Limits transient voltage to ≤45.7 V during 32.8 A surges, preventing latch-up or gate oxide damage in downstream ICs rated for 36 V absolute max. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to field wiring surges from motor contactors or solenoid actuation. IC Role / Device Role / Timing Role: Parallel-connected TVS on each 24 V DC input channel, absorbing repetitive 10/1000 µs transients induced by relay coil de-energization. Use Value: Maintains system uptime by eliminating false triggering and component failure - validated for 0.01% duty cycle operation at full 1500 W rating. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Shielding Ethernet PHYs and DSL line drivers from induced lightning surges on outdoor copper pairs per ITU-T K.20/K.21. IC Role / Device Role / Timing Role: Bidirectional TVS placed between differential pair and isolation transformer secondary, referenced to local ground plane. Use Value: Clamps common-mode transients to <46 V while preserving signal fidelity due to low capacitance (<100 pF typical) and symmetric VBR. |
Use Scenario: Secondary-side overvoltage suppression in wall-mounted AC/DC adapters for USB-C PD and smart home devices. IC Role / Device Role / Timing Role: Final-stage clamp across regulated 5 V/9 V/12 V output rails to absorb capacitor discharge or regulator fault transients. Use Value: Prevents downstream device reset or damage during output short-circuit recovery, with guaranteed operation up to 175 °C ambient near transformer/heatsink zones. |
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 | DO-214AA (SMB) package, lower PPPM = 600 W, same VBR range (31.4–34.7 V), higher IPPM = 17.6 A | Surface-mount only; suited for space-constrained PCBs but requires reflow-compatible layout and lacks axial lead mechanical robustness | Select SMBJ33CA when board real estate is limited and surge requirements are ≤600 W; not drop-in for through-hole 1.5KE footprint. |
| 1.5SMC33CA | DO-214AB (SMC) package, PPPM = 1500 W, identical VBR/VC, but larger body and higher thermal mass than 1.5KE | Offers superior thermal dissipation (RθJA ≈ 50 °C/W vs. 75 °C/W) for high-ambient industrial use, yet requires larger PCB cutout | Choose 1.5SMC33CA where sustained surge repetition or elevated ambient temperatures demand enhanced thermal performance beyond DO-201AD limits. |
Compared with 1.5KE33CA-E3/51, SMBJ33CA trades mechanical ruggedness and through-hole assembly for compact SMT integration, while 1.5SMC33CA retains full 1500 W capability in a thermally superior but physically larger package - both require layout adaptation and do not share pinout or mounting method.
Availability
1.5KE33CA-E3/51 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter designs requiring stable component supply, RoHS-compliant sourcing, and volume-ready logistics.
Supply support for 1.5KE33CA-E3/51 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 1.5KE series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where fast, repeatable clamping and wide temperature operation are critical.
FAQ
What is the breakdown voltage tolerance for 1.5KE33CA-E3/51?
The 1.5KE33CA-E3/51 has a specified breakdown voltage range of 31.4 V to 34.7 V at 1 mA test current, representing a ±5% tolerance around the nominal 33 V rating. This tight VBR window ensures predictable clamping onset across production lots and supports accurate system-level surge margin analysis in designs using 1.5KE33CA-E3/51.
Is 1.5KE33CA-E3/51 suitable for automotive applications?
The 1.5KE33CA-E3/51 itself is commercial-grade (E3 suffix), but Vishay offers the AEC-Q101-qualified variant 1.5KE33CAHE3_B for automotive use. While 1.5KE33CA-E3/51 meets key electrical specs for automotive surge protection (e.g., 1500 W, 175 °C TJ), its qualification status requires verification against specific OEM requirements - always confirm compliance documentation for 1.5KE33CA-E3/51 before deployment in safety-critical vehicle subsystems.
How does the bidirectional nature of 1.5KE33CA-E3/51 affect PCB layout?
Because 1.5KE33CA-E3/51 is bidirectional, it has no polarity marking and can be mounted in either orientation - simplifying assembly and eliminating risk of reverse installation. Layout must still ensure low-inductance paths to ground and adequate copper pour for thermal dissipation, especially given its 1500 W rating and RθJL = 15.4 °C/W. No series resistor or direction-dependent filtering is needed for 1.5KE33CA-E3/51 placement.
What is the maximum clamping voltage of 1.5KE33CA-E3/51 under surge conditions?
The maximum clamping voltage (VC) of 1.5KE33CA-E3/51 is 45.7 V at its rated peak pulse current of 32.8 A (10/1000 µs waveform). This value represents the upper limit of voltage seen by protected circuitry during worst-case transient events and is critical for verifying that downstream components remain within their absolute maximum ratings when 1.5KE33CA-E3/51 is deployed.
Does 1.5KE33CA-E3/51 require a heatsink for standard operation?
No external heatsink is required for 1.5KE33CA-E3/51 under single-pulse or low-duty-cycle surge conditions, as its RθJL = 15.4 °C/W allows sufficient heat transfer through leads to PCB copper. However, for repetitive surges or high-ambient environments (>85 °C), increasing copper area around leads and optimizing trace width significantly improves thermal performance - the 1.5KE33CA-E3/51 datasheet provides derating curves for such cases.
1.5KE33CA-E3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE33CA-E3/51 FAQ
1.How can I place an order for 1.5KE33CA-E3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33CA-E3/51 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 1.5KE33CA-E3/51 reliable?
The price and inventory of 1.5KE33CA-E3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE33CA-E3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE33CA-E3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33CA-E3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33CA-E3/51?
1.5KE33CA-E3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33CA-E3/51 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 1.5KE33CA-E3/51?
For technical support, including 1.5KE33CA-E3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33CA-E3/51 requirements.
6.How does Aetrix verify that 1.5KE33CA-E3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE33CA-E3/51 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 1.5KE33CA-E3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE33CA-E3/51?
All 1.5KE33CA-E3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33CA-E3/51, 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 1.5KE33CA-E3/51 part is unused and in its original packaging.
Return procedure for 1.5KE33CA-E3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33CA-E3/51 Tags
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