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onsemi 1.5KE39ARL4
- Part No.:
- 1.5KE39ARL4
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1.5KE39ARL4.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,424
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Product details
Overview
1.5KE39ARL4 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 33.3 V working peak reverse voltage (VRWM), 39 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤53.9 V at 28 A peak pulse current - used in power supply input stages, industrial I/O interfaces, and telecom line cards.
For engineers reviewing the 1.5KE39ARL4 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC VMAX, VRWM alignment with DC bus voltage, surge current capability under 1 ms pulses, and UL 497B recognition for isolated loop circuit compliance.
Technical Context
This device operates as a silicon avalanche diode in reverse-biased mode, entering low-impedance conduction when transient voltage exceeds its VBR of 39 V (min 37.1 V, max 41 V). Its fast response time (<1 ns) and low dynamic impedance ensure rapid clamping before downstream components experience overvoltage stress.
The 1.5KE39ARL4 is housed in an axial-leaded Surmetic plastic package (Case 41A) with cathode polarity band marking, rated for 1500 W non-repetitive peak pulse power at TL ≤ 25°C and derated linearly above 75°C ambient. It meets Class 3 ESD immunity (>16 kV HBM) and UL 497B certification for isolated loop protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 33.3 V - maximum continuous reverse operating voltage; must be ≥ system DC rail to avoid leakage during normal operation |
| VBR @ IT=1 mA | 37.1–41.0 V - breakdown threshold range; defines onset of clamping behavior under standardized test conditions |
| VC @ IPP=28 A | ≤53.9 V - maximum clamped voltage during 1 ms surge; determines worst-case overvoltage seen by protected load |
| IPP | 28 A - peak pulse current supported at 1 ms pulse width; defines surge energy handling per IEC 61000-4-5 Level 4 |
| IR @ VRWM | ≤5 µA - reverse leakage at rated working voltage; ensures minimal power loss and signal integrity in high-impedance circuits |
| Response Time | <1 ns - time from transient onset to clamping initiation; critical for protecting fast CMOS/MOS inputs |
| UL Recognition | UL 497B certified - validated for use in isolated communication loops including RS-485/RS-232 interfaces |
Pinout & Package
1.5KE39ARL4 uses an axial-leaded plastic package (Case 41A, Surmetic), with cathode identified by a colored band on the body. Leads are tin-plated copper, solderable at 260°C for 10 seconds at 1/16″ from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes current path during clamping |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., VIN, signal line); receives surge energy prior to clamping |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W Peak Pulse Power | Supports robust protection against IEC 61000-4-5 1.2/50 µs + 8/20 µs combined wave surges up to Level 4 (4 kV/2 kA) |
| UL 497B Certification | Validated for safety-critical isolated loop applications including medical and industrial fieldbus interfaces |
| ESD Rating >16 kV HBM | Meets IEC 61000-4-2 Level 4 for system-level ESD immunity without additional front-end filtering |
| Low Clamping Ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage margin between breakdown and clamp, enabling tighter protection design margins |
| Pb-Free Axial Package | RoHS-compliant Surmetic Case 41A construction with lead-free terminations and halogen-free molding compound |
Applications
| Industrial Power Supply Input Protection | RS-485 Communication Line Protection |
|---|---|
Use Scenario: Installed across AC/DC converter input or DC bus rails to absorb lightning-induced surges and switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode providing parallel clamping to limit transient overvoltage before it reaches rectifier, controller, or bulk capacitor. Use Value: Clamps 28 A surges to ≤53.9 V, preventing damage to 36 V-rated controllers and maintaining system uptime in factory automation environments. | Use Scenario: Placed on differential A/B lines of RS-485 transceivers in building control networks exposed to long cable runs. IC Role / Device Role / Timing Role: Transient suppressor referenced to local ground, shunting common-mode surges induced on twisted-pair cabling. Use Value: UL 497B certification ensures compliance with isolated loop safety requirements while limiting line voltage excursions to <54 V during 1 kV surge events. |
| Medical Equipment I/O Port Protection | Programmable Logic Controller (PLC) Digital Input Protection |
Use Scenario: Mounted on analog sensor inputs (e.g., temperature, pressure) of diagnostic imaging systems where signal integrity and patient safety are critical. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA) TVS diode preserving microamp-level sensor accuracy while blocking ESD events. Use Value: Sub-1 ns response prevents transient coupling into precision ADC front-ends, supporting IEC 60601-1-2 ESD immunity requirements. | Use Scenario: Integrated into 24 V DC digital input modules of PLC chassis to protect optocoupler inputs from field-wiring transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact or PNP-sourced inputs subjected to inductive kickback from solenoids or relays. Use Value: Withstands 1500 W surges without degradation, enabling maintenance-free operation over 10+ years in harsh manufacturing environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A | Lower peak power (600 W), SMC package, VRWM = 36 V, VC = 58.1 V @ 10.3 A | Better suited for space-constrained PCB layouts; lower surge rating limits use to Level 2/3 IEC 61000-4-5 | Select SMBJ36A when board area is constrained and surge threat level is moderate (e.g., indoor office equipment). |
| 1.5SMC39A | Same VRWM/VBR/VC specs, but SMC surface-mount package (JEDEC DO-214AB), tape-and-reel delivery | Requires reflow-compatible layout; lacks axial lead mechanical robustness for high-vibration environments | Choose 1.5SMC39A for automated assembly and compact designs where vibration is not a concern. |
Compared with SMBJ36A and 1.5SMC39A, the 1.5KE39ARL4 offers higher surge endurance (1500 W vs. 600 W or same-power SMC), axial leads for through-hole reliability in industrial enclosures, and UL 497B listing - making it preferred for high-energy, safety-certified, and mechanically demanding applications.
Availability
1.5KE39ARL4 is available at Aetrix Electronics and suitable for industrial power supplies, RS-485 communication interfaces, and medical I/O protection requiring stable component supply and long-term lifecycle support.
Supply support for 1.5KE39ARL4 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, sensors, and discrete devices for automotive, industrial, and cloud power applications.
The 1.5KE39ARL4 belongs to the 1.5KE series of high-power Mosorb TVS diodes, engineered specifically for robust, cost-effective overvoltage protection in high-energy industrial and communications infrastructure.
FAQ
What is the clamping voltage of the 1.5KE39ARL4 under maximum rated surge current?
The 1.5KE39ARL4 clamps to a maximum of 53.9 V when subjected to its rated peak pulse current of 28 A with a 1 ms waveform. This value is measured per Figure 5 in the ON Semiconductor datasheet and represents the worst-case voltage imposed on protected circuitry during a full-energy transient event. Designers must verify that this clamped voltage remains below the absolute maximum ratings of downstream components.
Does the 1.5KE39ARL4 meet UL 497B certification, and what does that mean for my design?
Yes, the 1.5KE39ARL4 carries UL 497B recognition (File #E210057) for protector classification. This certification confirms successful completion of strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing - validating its suitability in safety-critical isolated loop circuits such as RS-485, RS-232, and PoE-powered interfaces. Use of UL 497B-listed parts may reduce end-equipment certification effort.
How does the 1.5KE39ARL4 differ from the 1.5KE39AG variant?
The 1.5KE39ARL4 and 1.5KE39AG share identical electrical specifications and axial Surmetic packaging, but differ in packaging format: RLL4 denotes 1500-unit tape-and-reel delivery optimized for automated insertion, while AG indicates 500-unit bulk box packaging. Both are Pb-free and functionally interchangeable in circuit design - only handling and assembly logistics differ.
Can the 1.5KE39ARL4 be used in bidirectional protection configurations?
No - the 1.5KE39ARL4 is a unidirectional TVS diode, intended only for clamping positive transients relative to ground. For bidirectional (AC-line or differential) protection, a dedicated bidirectional part such as 1.5KE39CA or paired unidirectional devices in back-to-back configuration would be required. Using 1.5KE39ARL4 in reverse bias beyond its VRWM risks permanent degradation due to excessive leakage or thermal runaway.
What is the maximum allowable lead temperature during soldering of the 1.5KE39ARL4?
The 1.5KE39ARL4 supports a maximum lead temperature of 260°C for 10 seconds at a distance of 1/16 inch (1.6 mm) from the plastic case body. This specification aligns with standard IPC-J-STD-020 moisture sensitivity level (MSL) guidelines for through-hole components. Exceeding this limit risks internal bond wire damage or delamination of the Surmetic encapsulant, compromising surge reliability.
1.5KE39ARL4 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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 28A
- 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
1.5KE39ARL4 FAQ
1.How can I place an order for 1.5KE39ARL4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE39ARL4 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 1.5KE39ARL4 reliable?
The price and inventory of 1.5KE39ARL4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE39ARL4 is usually 5 days.
3.What payment methods are accepted for 1.5KE39ARL4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE39ARL4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE39ARL4?
1.5KE39ARL4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE39ARL4 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 1.5KE39ARL4?
For technical support, including 1.5KE39ARL4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE39ARL4 requirements.
6.How does Aetrix verify that 1.5KE39ARL4 is sourced from the original manufacturer or authorized distributors?
All 1.5KE39ARL4 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 1.5KE39ARL4 meets industry standards.
7.What is the process for return or replacement of 1.5KE39ARL4?
All 1.5KE39ARL4 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE39ARL4, 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 1.5KE39ARL4 part is unused and in its original packaging.
Return procedure for 1.5KE39ARL4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE39ARL4 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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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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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
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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