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Vishay General Semiconductor - Diodes Division 1.5KE33A-E3/54
- Part No.:
- 1.5KE33A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE33A-E3/54.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:9,336
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Product details
Overview
1.5KE33A-E3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of 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 standoff 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 in automotive power supply inputs, industrial sensor interfaces, and telecom line protection.
For engineers reviewing the 1.5KE33A-E3/54 datasheet, 1.5KE33A-E3/54 pinout, 1.5KE33A-E3/54 application, or 1.5KE33A-E3/54 equivalent, this device delivers verified transient suppression performance for 24 V and 32 V systems where fast response (<1 ns), low clamping ratio (VC/VWM ≈ 1.62), and AEC-Q101-compliant variants are critical selection criteria.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: it remains high-impedance below VWM (28.2 V), transitions sharply into avalanche conduction at VBR (31.4–34.7 V), and limits transient voltages to ≤45.7 V at 32.8 A. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM).
Thermal design relies on its 15.4 °C/W junction-to-lead thermal resistance and 75 °C/W junction-to-ambient rating, supporting operation up to +175 °C junction temperature. The device uses a standard DO-201AD axial package with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1.0 mA - defines precise avalanche onset window for reliable triggering in 24–32 V systems |
| VWM | 28.2 V - maximum continuous reverse operating voltage; ensures no conduction during normal 24 V rail operation |
| VC @ IPPM | 45.7 V at 32.8 A - clamping voltage under 10/1000 µs surge; limits downstream IC stress to safe levels |
| PPPM | 1500 W - peak pulse power handling capability; sustains single lightning-induced surges per IEC 61000-4-5 Level 4 |
| IPPM | 32.8 A - peak pulse current capacity; supports robust protection against 1 kV/500 Ω ring wave transients |
| TJ max. | +175 °C - maximum junction temperature; enables use in under-hood automotive and industrial enclosures |
| Leakage @ VWM | <1.0 µA - ultra-low reverse leakage preserves battery life and avoids false triggers in low-power sensor nodes |
Pinout & Package
Package: DO-201AD (Case Style 1.5KE), axial leaded, molded epoxy body meeting UL 94 V-0 flammability rating. Cathode indicated by color band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; forms shunt path during overvoltage events |
| Cathode | High-side protected node | Connected to protected line (e.g., 24 V rail or signal input); blocks reverse current until VBR exceeded |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage over temperature and lifetime; eliminates parameter drift in harsh environments |
| 1500 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation |
| Clamping ratio VC/VWM = 1.62 | Minimizes voltage overshoot during transients - critical for protecting 3.3 V/5 V logic powered from 24 V supplies |
| Response time <1 ns | Activates before most semiconductor damage mechanisms initiate; protects MOSFET gates and MCU I/O pins |
| RoHS-compliant, commercial grade (E3 suffix) | Meets JESD 201 Class 1A whisker test; suitable for automated assembly and long-term reliability in consumer/industrial gear |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 24 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS placed between power rail and chassis ground; clamps transients within nanoseconds. Use Value: Limits rail voltage to ≤45.7 V during 100 V/100 ms load dump events, preventing damage to LDOs and microcontrollers. |
Use Scenario: 4–20 mA current loop sensors in factory automation subject to ESD and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS across sensor output terminals; suppresses fast-rising transients on analog outputs. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) to <46 V, preserving 16-bit ADC accuracy and isolator integrity. |
| Telecom DC Power Feeds | Consumer Device USB/DC Jack Protection |
Use Scenario: -48 V DC power distribution in telecom cabinets with risk of lightning-induced surges on remote lines. IC Role / Device Role / Timing Role: Primary TVS on input stage of DC-DC converter; coordinated with secondary MOV/gas tube stages. Use Value: Absorbs 1500 W surge energy while maintaining VC ≤45.7 V - compatible with -48 V system derating margins. |
Use Scenario: 12 V DC input jacks on smart home hubs subjected to user-insertion ESD and nearby relay switching. IC Role / Device Role / Timing Role: Standalone TVS on DC input before PMIC; provides first-line defense against human-body-model discharges. Use Value: Blocks >10 kV air discharge (IEC 61000-4-2) with sub-1 ns response, eliminating latch-up in buck controllers. |
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 PPPM (600 W), smaller SMB package (vs. DO-201AD), same VBR range (31.4–34.7 V) | Better suited for space-constrained PCBs; lower surge margin requires coordination with upstream fusing | Select when board area is limited and peak surge energy is ≤600 W; verify thermal relief for repeated events |
| 1.5KE33CA | Bidirectional variant; identical VBR, VC, and PPPM; symmetric clamping for AC-coupled or floating lines | Required for differential signal pairs (e.g., RS-485), transformer-isolated interfaces, or AC power monitoring | Choose only if bidirectional protection is needed; unidirectional 1.5KE33A-E3/54 offers superior leakage and cost for DC rails |
Compared with SMBJ33A, 1.5KE33A-E3/54 delivers 2.5× higher surge power headroom in a through-hole package ideal for high-reliability power inputs; versus 1.5KE33CA, it provides tighter leakage control and lower cost where polarity is fixed and ground-referenced protection suffices.
Availability
1.5KE33A-E3/54 is available at Aetrix Electronics and suitable for automotive power modules, industrial sensor transmitters, telecom DC feeds, and consumer DC input protection requiring stable component supply and full traceability.
Supply support for 1.5KE33A-E3/54 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 qualification.
The 1.5KE series was engineered for high-energy transient suppression in demanding DC power and interface applications - targeting automotive, industrial, and telecom markets where failure modes must be mitigated without compromising long-term stability.
FAQ
What is the breakdown voltage tolerance of the 1.5KE33A-E3/54?
The 1.5KE33A-E3/54 has a specified breakdown voltage range of 31.4 V to 34.7 V at 1.0 mA test current, representing ±5% tolerance around the nominal 33 V rating. This tight VBR window ensures consistent triggering behavior across production lots and temperature ranges from –55 °C to +175 °C. The 1.5KE33A-E3/54 maintains this specification under JEDEC-standard test conditions and is validated per Vishay Document Number 88301.
Is the 1.5KE33A-E3/54 RoHS compliant and lead-free?
Yes, the 1.5KE33A-E3/54 carries the "E3" suffix, indicating full RoHS compliance and lead-free construction per EU Directive 2011/65/EU. Its matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability requirements, and it passes JESD 201 Class 1A whisker testing. The 1.5KE33A-E3/54 is rated for solder dip at 275 °C for up to 10 seconds, supporting both wave and reflow assembly processes.
How does the clamping voltage of the 1.5KE33A-E3/54 compare to its standoff voltage?
The 1.5KE33A-E3/54 has a maximum standoff voltage (VWM) of 28.2 V and a clamping voltage (VC) of 45.7 V at 32.8 A, yielding a clamping ratio of approximately 1.62. This ratio reflects efficient energy diversion with minimal overshoot - critical for protecting downstream 3.3 V or 5 V logic supplied from 24 V rails. The 1.5KE33A-E3/54 achieves this via low incremental surge resistance and optimized junction geometry.
Can the 1.5KE33A-E3/54 be used in automotive applications?
The base 1.5KE33A-E3/54 is commercial-grade; however, the AEC-Q101-qualified variant 1.5KE33AHE3_B is available for automotive use. While the 1.5KE33A-E3/54 itself meets key automotive environmental specs - including –55 °C to +175 °C operating range and robust surge capability - system-level qualification requires the HE3 suffix. For non-safety-critical 12 V/24 V subsystems, the 1.5KE33A-E3/54 is widely deployed, but full automotive compliance mandates the HE3 version.
What is the thermal resistance of the 1.5KE33A-E3/54 and how does it affect layout?
The 1.5KE33A-E3/54 has a typical junction-to-lead thermal resistance (RθJL) of 15.4 °C/W and junction-to-ambient (RθJA) of 75 °C/W. To manage power dissipation during repetitive surges, PCB layout must maximize copper area connected to both leads - especially the cathode - using ≥10 mm² thermal pads and short, wide traces. The 1.5KE33A-E3/54 benefits from axial lead mounting with ≥9.5 mm lead length for optimal heat transfer to the board.
1.5KE33A-E3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- 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:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE33A-E3/54 FAQ
1.How can I place an order for 1.5KE33A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33A-E3/54 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-E3/54 reliable?
The price and inventory of 1.5KE33A-E3/54 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-E3/54 is usually 5 days.
3.What payment methods are accepted for 1.5KE33A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33A-E3/54?
1.5KE33A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33A-E3/54 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-E3/54?
For technical support, including 1.5KE33A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33A-E3/54 requirements.
6.How does Aetrix verify that 1.5KE33A-E3/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE33A-E3/54 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-E3/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE33A-E3/54?
All 1.5KE33A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33A-E3/54, 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-E3/54 part is unused and in its original packaging.
Return procedure for 1.5KE33A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33A-E3/54 Tags
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