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onsemi 1.5KE33A
- Part No.:
- 1.5KE33A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1.5KE33A.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,225
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Product details
Overview
1.5KE33A from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against ESD, lightning surges, and inductive switching transients. It features a 33 V breakdown voltage (VBR = 31.4–34.7 V @ IT = 1 mA), 45.7 V maximum clamping voltage (VC) at 33 A peak pulse current (IPP), and <1 ns response time - deployed in power supplies, industrial controls, and medical equipment input stages.
For engineers reviewing the 1.5KE33A datasheet, pinout, applications, or equivalent options, key selection criteria include working peak reverse voltage (VRWM = 28.2 V), low zener impedance, UL 497B recognition for isolated loop protection, and axial leaded Surmetic CASE 41A package compatibility with through-hole PCB layouts.
Technical Context
The 1.5KE33A operates as a silicon avalanche diode optimized for unidirectional transient suppression. Its clamping behavior follows a sharp Zener breakdown characteristic with VBR tolerance ±5% and temperature coefficient of +0.098 %/°C, enabling stable overvoltage protection across −65 °C to +175 °C operating range.
It delivers 1500 W nonrepetitive peak pulse power (tP = 1 ms, 10/1000 µs waveform), with thermal resistance RJL = 20 °C/W and steady-state power dissipation of 5.0 W at TL ≤ 75 °C - requiring minimal heatsinking in typical surge-limited applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 28.2 V - maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT | 31.4–34.7 V @ 1 mA - precise breakdown threshold defining turn-on sensitivity |
| VC @ IPP | 45.7 V @ 33 A - maximum clamped voltage during 1 ms surge, limiting downstream stress |
| IPP | 33 A - peak pulse current capability under standardized 10/1000 µs waveform |
| Response Time | <1 ns - enables suppression before transient energy couples into protected ICs |
| ESD Rating | Class 3 (>16 kV HBM) - meets stringent electrostatic discharge immunity requirements |
| UL Recognition | UL 497B certified - validated for isolated loop circuit protection in telecom and industrial systems |
Pinout & Package
1.5KE33A uses an axial-leaded plastic package (CASE 41A, Surmetic™ molding) with cathode indicated by a polarity band. Leads are tin-plated, solderable at 260 °C for 10 s at 1/16″ from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to system ground or low-impedance return path in unidirectional clamp configuration |
| Cathode | Current exit point during reverse breakdown | Connected to protected line (e.g., DC input rail); polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Handles high-energy transients (e.g., IEC 61000-4-5 Level 4 surges) without failure |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage margin between operating and clamped states for tighter system protection |
| UL 497B certification | Validates suitability for safety-critical isolated loop interfaces in telecom and process control |
| −65 °C to +175 °C operating range | Supports deployment in harsh environments including automotive under-hood and industrial motor drives |
| Pb-free axial package (RoHS compliant) | Enables direct replacement in legacy through-hole designs without requalification |
Applications
| Industrial Power Supply Input Protection | Medical Equipment Surge Suppression |
|---|---|
Use Scenario: Protecting AC/DC front-end rectifiers and bulk capacitors from line-to-line and line-to-ground surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus inputs to clamp transients before they reach primary-side controllers or isolation barriers. Use Value: Limits voltage excursion to ≤45.7 V during 33 A surges, preventing MOSFET gate oxide rupture and controller latch-up in 24–48 V systems. | Use Scenario: Safeguarding patient-connected signal paths (e.g., ECG leads, sensor inputs) against defibrillator-induced surges. IC Role / Device Role / Timing Role: Primary-level transient suppressor on isolated analog front-end inputs, upstream of precision amplifiers and ADCs. Use Value: UL 497B recognition ensures compliance with medical isolation barrier standards while maintaining sub-nanosecond response to preserve signal integrity. |
| Programmable Logic Controller (PLC) I/O Protection | Telecom Line Interface Protection |
Use Scenario: Shielding digital I/O modules from inductive kickback and field-wiring transients in factory automation cabinets. IC Role / Device Role / Timing Role: Discrete TVS mounted directly at terminal blocks to shunt surge energy before entering optocoupler or level-shifter circuits. Use Value: 28.2 V VRWM matches common 24 V DC control logic rails, ensuring no leakage during normal operation while clamping fast-rising spikes. | Use Scenario: Protecting Ethernet PHYs, RS-485 transceivers, and DSL line drivers from lightning-induced longitudinal surges on twisted-pair lines. IC Role / Device Role / Timing Role: Unidirectional clamp on data line pairs referenced to isolated ground, meeting GR-1089-CORE telecom surge requirements. Use Value: Low dynamic impedance and <1 ns response prevent data corruption during multi-kV transients, preserving bit-error rate in high-speed links. |
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 | Surface-mount SMB package (vs. axial), lower 600 W peak power, same VRWM/VC specs | Requires PCB redesign for SMT assembly; better suited for space-constrained consumer electronics | Select when board real estate is limited and automated assembly is preferred over through-hole |
| 1N6283AG | Same die and electrical specs; identical JEDEC device code (1N6283AG), Pb-free axial package variant | No functional or layout difference - direct form-fit-function replacement with RoHS compliance | Choose for full regulatory alignment where "G" suffix denotes guaranteed Pb-free construction |
Compared with SMBJ33A and 1N6283AG, the 1.5KE33A offers higher surge robustness (1500 W vs. 600 W) in a legacy-compatible axial package, making it optimal for industrial power entry and retrofit designs where mechanical durability and proven field reliability are prioritized over footprint size.
Availability
1.5KE33A is available at Aetrix Electronics and suitable for industrial power supply input protection, medical equipment surge suppression, and PLC I/O protection requiring stable component supply across long-life product cycles.
Supply support for 1.5KE33A 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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete devices for automotive, industrial, and cloud power applications.
The 1.5KE33A belongs to the 1.5KE series of high-power unidirectional TVS diodes engineered for robust, cost-effective overvoltage protection in harsh electromagnetic environments - particularly targeting industrial control, medical, and communications infrastructure.
FAQ
What is the maximum clamping voltage of the 1.5KE33A under standard surge conditions?
The 1.5KE33A exhibits a maximum clamping voltage (VC) of 45.7 V when subjected to its rated peak pulse current of 33 A (10/1000 µs waveform). This value is measured per Figure 5 in the ON Semiconductor datasheet and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components like MOSFETs or controllers remain within safe operating limits.
Is the 1.5KE33A suitable for bidirectional transient protection?
No, the 1.5KE33A is a unidirectional TVS diode and must be used with correct polarity - cathode connected to the line being protected, anode to ground. For bidirectional protection, a symmetric device such as the 1.5KE33CA (center-tapped, bidirectional variant) is required. Using the 1.5KE33A in reverse-biased configurations risks permanent damage due to lack of reverse breakdown specification.
Does the 1.5KE33A meet UL safety certification requirements?
Yes, the 1.5KE33A carries UL 497B recognition (File #E210057) for isolated loop circuit protection. This certification validates performance in strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing - confirming its suitability for safety-critical telecom, industrial, and medical applications where regulatory compliance is mandatory.
What is the operating temperature range for the 1.5KE33A?
The 1.5KE33A is rated for an operating and storage temperature range of −65 °C to +175 °C. This wide range supports deployment in extreme environments such as automotive engine compartments, outdoor industrial enclosures, and medical sterilization equipment - enabled by thermosetting plastic encapsulation and robust junction-to-lead thermal design (RJL = 20 °C/W).
How does the 1.5KE33A compare to the 1N6283AG in terms of electrical performance?
The 1.5KE33A and 1N6283AG share identical electrical specifications - including VRWM = 28.2 V, VBR = 31.4–34.7 V @ 1 mA, VC = 45.7 V @ 33 A, and 1500 W peak power. The "G" suffix in 1N6283AG explicitly denotes Pb-free construction, whereas 1.5KE33A may be supplied in legacy or Pb-free variants depending on date code - both are functionally interchangeable in circuit design.
1.5KE33A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- Mosorb™
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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):
- 33A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1.5KE33A FAQ
1.How can I place an order for 1.5KE33A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33A 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 reliable?
The price and inventory of 1.5KE33A 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 is usually 5 days.
3.What payment methods are accepted for 1.5KE33A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33A?
1.5KE33A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33A 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?
For technical support, including 1.5KE33A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33A requirements.
6.How does Aetrix verify that 1.5KE33A is sourced from the original manufacturer or authorized distributors?
All 1.5KE33A 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 meets industry standards.
7.What is the process for return or replacement of 1.5KE33A?
All 1.5KE33A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33A, 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 part is unused and in its original packaging.
Return procedure for 1.5KE33A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33A Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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