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Vishay General Semiconductor - Diodes Division 1.5KE33A-E3/73
- Part No.:
- 1.5KE33A-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE33A-E3/73.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:7,559
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Product details
Overview
1.5KE33A-E3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC 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 maximum working voltage (VWM), 45.7 V clamping voltage (VC) at 32.8 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5KE33A-E3/73 datasheet, 1.5KE33A-E3/73 pinout, 1.5KE33A-E3/73 application, or 1.5KE33A-E3/73 equivalent, this part delivers verified unidirectional clamping performance, RoHS-compliant matte tin-plated leads, JEDEC-standard 1.5KE case packaging, and thermal robustness up to 175 °C junction temperature - critical for automotive, industrial power supply, and telecom front-end protection design.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 28.2 V), then transitions to low-impedance conduction within <1 ns when transient voltage exceeds VBR. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance.
The device complies with JEDEC standards for transient suppression, supports 200 A non-repetitive forward surge current (8.3 ms half-sine), and exhibits a +0.098 %/°C temperature coefficient of VBR, enabling predictable voltage margining across operating temperatures from –55 °C to +175 °C.
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 threshold for reliable overvoltage triggering |
| VWM | 28.2 V - maximum continuous reverse operating voltage without significant leakage |
| VC @ IPPM | 45.7 V at 32.8 A - clamped voltage during 1500 W transient, limiting stress on downstream components |
| PPPM | 1500 W - peak pulse power handling capability with 10/1000 µs waveform, suitable for IEC 61000-4-5 Level 4 compliance |
| IFSM | 200 A - single half-sine surge current rating (8.3 ms), supporting high-energy inductive load switching events |
| TJ max. | +175 °C - enables operation in under-hood automotive or high-temperature industrial environments |
| RθJA | 75 °C/W - thermal resistance from junction to ambient, informing heatsinking requirements for sustained power dissipation |
Pinout & Package
Package: JEDEC-standard Case Style 1.5KE - molded epoxy body with glass-passivated chip junction, UL 94 V-0 rated, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Current exit point during forward conduction; marked with band | Connected to protected line (e.g., 24 V rail or signal input) - clamps to anode when overvoltage occurs |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable avalanche behavior and long-term reliability under repeated surge stress |
| 1500 W peak pulse power (10/1000 µs) | Supports robust protection against lightning surges (IEC 61000-4-5) and inductive kickback in motor drives |
| Clamping response time <1 ns | Protects fast-switching MOSFETs and microcontrollers before damaging voltage overshoot propagates |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker test and global environmental compliance for commercial-grade applications |
| –55 °C to +175 °C operating range | Validated for under-hood automotive, industrial control, and outdoor telecom equipment deployments |
Applications
| Industrial Motor Drive Protection | Automotive Power Supply Clamp |
|---|---|
Use Scenario: Suppresses voltage spikes from relay coil de-energization and H-bridge shoot-through in PLC output modules. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed across DC bus or gate driver supply rail to clamp transients below MOSFET VDSS rating. Use Value: Limits clamped voltage to 45.7 V at 32.8 A, preventing gate oxide damage and ensuring >2× safety margin versus 24 V system rails. |
Use Scenario: Protects infotainment head unit power input against load dump and jump-start surges in 12 V vehicle systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V input, positioned upstream of DC-DC converters and LDOs. Use Value: Withstands 200 A surge (8.3 ms) and clamps to ≤45.7 V, preserving downstream regulators rated for 40 V absolute max input. |
| Telecom Line Interface Protection | Consumer Sensor Signal Line Guard |
Use Scenario: Shields RS-485 transceivers and Ethernet PHYs from induced surges on outdoor copper cabling. IC Role / Device Role / Timing Role: Unidirectional TVS on VCC rail and data lines, coordinated with series impedance for IEC 61000-4-5 compliance. Use Value: 1500 W pulse rating and 45.7 V clamping enable pass-level protection for Category 3/5 cable interfaces exposed to lightning coupling. |
Use Scenario: Guards analog outputs of temperature/humidity sensors in smart home hubs against ESD and board-level coupling. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 28.2 V) shunt protector on 3.3 V or 5 V sensor supply or I²C lines. Use Value: Sub-1 ns response prevents latch-up in precision ADCs and preserves signal integrity during 8 kV contact ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | Lower peak power (600 W), smaller SMB package (vs. axial 1.5KE), higher VC/VBR ratio (1.38 vs. 1.46) | Better suited for space-constrained PCBs but less robust for high-energy 10/1000 µs transients | Select SMBJ33A only if layout area is critical and surge energy remains ≤600 W; verify clamping margin with actual threat waveform. |
| 1.5KE33CA | Bidirectional variant (no polarity marking), same VBR/VC/PPPM, identical 1.5KE package | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., telecom tip/ring) | Choose 1.5KE33CA instead of 1.5KE33A-E3/73 only when protecting bidirectional signals - not a drop-in replacement due to polarity sensitivity. |
Compared with SMBJ33A and 1.5KE33CA, the 1.5KE33A-E3/73 offers superior 1500 W surge handling in a through-hole package ideal for high-reliability power rail protection, while maintaining tighter thermal management via lower RθJA than SMB variants and avoiding unnecessary bidirectional complexity in DC-coupled designs.
Availability
1.5KE33A-E3/73 is available at Aetrix Electronics and suitable for industrial motor drives, automotive power supplies, telecom line interfaces, and consumer sensor modules requiring stable component supply and long-lifecycle support.
Supply support for 1.5KE33A-E3/73 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, TVS devices, and optoelectronics with emphasis on reliability, ruggedness, and application-specific validation.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes demand proven 1500 W surge resilience and wide temperature operation.
FAQ
What is the breakdown voltage tolerance for 1.5KE33A-E3/73?
The 1.5KE33A-E3/73 has a specified breakdown voltage range of 31.4 V to 34.7 V at 1.0 mA test current, representing ±5.2% tolerance around the nominal 33 V rating. This tight VBR window ensures consistent clamping onset across production lots and supports accurate system-level overvoltage margining in safety-critical designs.
Does 1.5KE33A-E3/73 meet automotive qualification standards?
The 1.5KE33A-E3/73 is a commercial-grade part and is not AEC-Q101 qualified. For automotive applications requiring qualification, Vishay offers the 1.5KE33AHE3_B variant (with HE3 suffix), which is explicitly AEC-Q101 certified and shares identical electrical specs but adds process and test validation for automotive use cases.
How does the clamping voltage of 1.5KE33A-E3/73 compare to its breakdown voltage?
The 1.5KE33A-E3/73 clamps to 45.7 V at its rated 32.8 A peak pulse current, resulting in a VC/VBR ratio of approximately 1.46. This ratio reflects low incremental surge resistance and efficient energy diversion - critical for minimizing voltage overshoot on protected ICs and ensuring safe operation below their absolute maximum ratings.
Can 1.5KE33A-E3/73 be used in bidirectional signal protection?
No - the 1.5KE33A-E3/73 is strictly unidirectional and must be oriented with cathode toward the protected line. For bidirectional protection, the 1.5KE33CA variant is required. Using 1.5KE33A-E3/73 on AC or floating lines risks reverse conduction failure and inadequate clamping during negative transients.
What is the maximum allowable lead temperature during soldering for 1.5KE33A-E3/73?
The 1.5KE33A-E3/73 supports solder dip at 275 °C maximum for 10 seconds per JESD 22-B106, and its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 for solderability. Reflow profiles must stay within JEDEC Level 2a limits to avoid epoxy cracking or junction degradation.
1.5KE33A-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- 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:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE33A-E3/73 FAQ
1.How can I place an order for 1.5KE33A-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33A-E3/73 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 1.5KE33A-E3/73 reliable?
The price and inventory of 1.5KE33A-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE33A-E3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KE33A-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33A-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33A-E3/73?
1.5KE33A-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33A-E3/73 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 1.5KE33A-E3/73?
For technical support, including 1.5KE33A-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33A-E3/73 requirements.
6.How does Aetrix verify that 1.5KE33A-E3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KE33A-E3/73 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 1.5KE33A-E3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KE33A-E3/73?
All 1.5KE33A-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33A-E3/73, 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 1.5KE33A-E3/73 part is unused and in its original packaging.
Return procedure for 1.5KE33A-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33A-E3/73 Tags
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