My Inquiry
My Account
onsemi 1.5KE33ARL4
- Part No.:
- 1.5KE33ARL4
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1.5KE33ARL4.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,872
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5KE33ARL4 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics. It features a 28.2 V working peak reverse voltage (VRWM), 33 V nominal breakdown voltage (VBR), 45.7 V maximum clamping voltage (VC) at 33 A peak pulse current (IPP), and sub-1 ns response time. It is used in power supply input stages, industrial control I/O ports, and telecom line interfaces to absorb ESD and lightning-induced surges.
For engineers reviewing the 1.5KE33ARL4 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected circuit's absolute maximum rating, VRWM compatibility with DC operating voltage, surge current capability under 1 ms pulses, and UL 497B recognition for isolated loop protection compliance.
Technical Context
This device operates as a silicon avalanche diode optimized for transient suppression-not regulation or signal conditioning. Its unidirectional configuration allows placement anode-to-ground in DC-biased lines, with cathode connected to the protected node. The 20 °C/W junction-to-lead thermal resistance supports high-energy pulse dissipation when mounted with ≥3/8″ lead length.
Clamping behavior follows a well-defined dynamic impedance curve below 10 V overvoltage, enabling predictable voltage limiting during fast transients. It meets Class 3 ESD immunity (>16 kV HBM) and is rated for operation from −65 °C to +175 °C, making it suitable for harsh industrial environments where thermal cycling and long-term reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - absorbs single high-energy surges without failure |
| Working Peak Reverse Voltage | 28.2 V - sets maximum continuous DC bias before leakage exceeds 5 µA |
| Breakdown Voltage | 33 V (nominal) @ 1 mA - defines onset of avalanche conduction |
| Clamping Voltage | 45.7 V @ 33 A IPP - maximum voltage seen by protected circuit during full-rated surge |
| Response Time | <1 ns - ensures clamping initiates before most IC damage thresholds are exceeded |
| ESD Rating | Class 3 (>16 kV HBM) - exceeds IEC 61000-4-2 Level 4 for system-level ESD robustness |
| UL Recognition | UL 497B (QVGQ2) - certified for isolated loop circuit protection in telecom and industrial systems |
Pinout & Package
1.5KE33ARL4 is housed in an axial-leaded Surmetic plastic package (Case 41A), with cathode identified by a polarity band. Leads are tin-plated, solderable at 260 °C for 10 seconds at 1/16″ from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-impedance return path; must handle full surge current return |
| Cathode | Protected node connection | Connected directly to the line or IC pin being safeguarded; clamps voltage to ≤45.7 V during transients |
Key Features
| Feature | Design Value |
|---|---|
| Low zener impedance | Ensures stable clamping across varying surge currents-critical for consistent protection margin |
| Void-free molded plastic case | Prevents moisture ingress and delamination under thermal cycling, supporting 175 °C max operating temperature |
| Pb−Free (RoHS-compliant) | Meets global environmental regulations without compromising surge performance or solderability |
| Fast response & low overshoot | Sub-1 ns turn-on minimizes voltage excursion before clamping engages-reducing risk to downstream CMOS/MOS logic |
Applications
| Industrial PLC I/O Protection | AC/DC Power Supply Input |
|---|---|
Use Scenario: Protecting 24 V DC digital input modules in programmable logic controllers against induced surges from relay switching or nearby motor drives. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input line and chassis ground, clamping transients before they reach optocoupler or microcontroller input pins. Use Value: 45.7 V clamping voltage provides >5 V margin above 24 V nominal rail while staying below typical 50 V absolute maximum ratings of industrial-grade interface ICs. | Use Scenario: Safeguarding bridge rectifier outputs and bulk capacitor inputs in offline switch-mode power supplies subjected to AC line surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Parallel-connected TVS on DC bus side, activated only during rare high-energy events-no steady-state loading or leakage impact on efficiency. Use Value: 1500 W peak power rating handles 10/1000 µs waveform surges up to 33 A without degradation, preserving supply reliability over 10+ year field life. |
| Telecom Line Interface | Medical Equipment Signal Lines |
Use Scenario: Protecting RS-485 transceivers and isolation barriers in building automation networks exposed to lightning-induced longitudinal surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Paired with series impedance (e.g., 10 Ω resistor) and common-mode choke to form a coordinated protection network compliant with UL 497B. Use Value: UL 497B QVGQ2 recognition validates suitability for isolated loop circuits-enabling certification-ready designs without additional external testing. | Use Scenario: Shielding analog sensor inputs (e.g., ECG front-end amplifiers) from ESD events during handling or cable coupling in diagnostic imaging equipment. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector entry point, shunting human-body-model discharges before reaching precision amplifier inputs. Use Value: Class 3 HBM rating (>16 kV) exceeds IEC 61000-4-2 requirements, ensuring immunity to routine operator contact without signal distortion or offset shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | Surface-mount SMB package; lower 600 W peak power; 49.9 V clamping at 12.1 A IPP | Better suited for space-constrained PCBs but requires derating for same surge energy | Select when board area is limited and surge duty is less severe than 1.5KE33ARL4's 1500 W rating |
| 1.5SMC33A | Surface-mount SMC package; identical 1500 W rating; 49.9 V clamping at 30 A IPP | Same power handling but higher clamping voltage reduces protection margin for 3.3 V–5 V logic rails | Choose for automated assembly where axial leads are incompatible, accepting ~4.2 V higher clamping than 1.5KE33ARL4 |
Compared with SMBJ33A and 1.5SMC33A, the 1.5KE33ARL4 offers superior clamping voltage margin (45.7 V vs. ≥49.9 V) and axial-leaded mechanical robustness for high-vibration environments-making it preferred for industrial power entry and legacy through-hole designs requiring maximum surge headroom.
Availability
1.5KE33ARL4 is available at Aetrix Electronics and suitable for industrial control systems, medical device power inputs, and telecom infrastructure requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1.5KE33ARL4 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 supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1.5KE33ARL4 belongs to the Mosorb™ 1500 W TVS family, engineered specifically for high-reliability transient suppression in harsh environments-emphasizing low clamping voltage, UL 497B certification, and extended temperature operation.
FAQ
What is the clamping voltage of the 1.5KE33ARL4 at its rated peak pulse current?
The 1.5KE33ARL4 has a maximum clamping voltage (VC) of 45.7 V at 33 A peak pulse current (IPP), measured using the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during full-rated transient events and is verified per ON Semiconductor's test conditions in the 1N6267A Series datasheet.
Is the 1.5KE33ARL4 RoHS-compliant and lead-free?
Yes, the 1.5KE33ARL4 is Pb−Free and RoHS-compliant, indicated by the "G" suffix in its full part number (1.5KE33ARL4G per ordering information). Its axial leads are tin-plated and qualified for reflow and hand-soldering per J-STD-020, with maximum solder temperature of 260 °C for 10 seconds at 1/16″ from the case.
Does the 1.5KE33ARL4 have UL recognition for circuit protection?
Yes, the 1.5KE33ARL4 carries UL 497B recognition under file #E210057 (QVGQ2 category) for isolated loop circuit protection. This certification covers surge endurance, dielectric withstand, and discharge testing-validating its use in telecom, industrial control, and medical equipment where regulatory compliance is mandatory.
What is the working peak reverse voltage (VRWM) of the 1.5KE33ARL4, and why does it matter?
The 1.5KE33ARL4 has a VRWM of 28.2 V, meaning it remains in high-impedance blocking mode up to this DC or continuous peak voltage with leakage <5 µA. Selecting a VRWM ≥ the circuit's normal operating voltage prevents false triggering while maintaining sufficient margin to avoid thermal runaway during sustained overvoltage.
How does the 1.5KE33ARL4 compare to bidirectional TVS diodes in surge protection?
The 1.5KE33ARL4 is unidirectional and intended for DC-biased lines where polarity is fixed (e.g., +24 V inputs). Unlike bidirectional variants, it offers lower leakage and tighter clamping symmetry for positive transients-but cannot suppress negative-going surges without additional circuitry. Its design prioritizes optimal performance in grounded-anode configurations common in industrial power and control systems.
1.5KE33ARL4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- Mosorb™
- Packaging:
- Tape & Reel (TR)
- 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
1.5KE33ARL4 FAQ
1.How can I place an order for 1.5KE33ARL4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE33ARL4 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 1.5KE33ARL4 reliable?
The price and inventory of 1.5KE33ARL4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE33ARL4 is usually 5 days.
3.What payment methods are accepted for 1.5KE33ARL4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE33ARL4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE33ARL4?
1.5KE33ARL4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE33ARL4 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 1.5KE33ARL4?
For technical support, including 1.5KE33ARL4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE33ARL4 requirements.
6.How does Aetrix verify that 1.5KE33ARL4 is sourced from the original manufacturer or authorized distributors?
All 1.5KE33ARL4 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 1.5KE33ARL4 meets industry standards.
7.What is the process for return or replacement of 1.5KE33ARL4?
All 1.5KE33ARL4 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE33ARL4, 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 1.5KE33ARL4 part is unused and in its original packaging.
Return procedure for 1.5KE33ARL4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE33ARL4 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
