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onsemi 1.5KE51ARL4
- Part No.:
- 1.5KE51ARL4
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1.5KE51ARL4.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,572
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Product details
Overview
1.5KE51ARL4 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 43.6 V working peak reverse voltage (VRWM), 51 V nominal breakdown voltage (VBR), 70.1 V maximum clamping voltage (VC) at 21.4 A peak pulse current (IPP), and sub-1 ns response time - deployed in power supply input stages, industrial I/O interfaces, and telecom line cards.
For engineers reviewing the 1.5KE51ARL4 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, VRWM compatibility with DC bus voltage, surge current capability under 8.3 ms waveform, and UL 497B recognition for isolated loop circuit compliance.
Technical Context
This device operates as a silicon avalanche diode in reverse-biased mode, entering controlled breakdown when transient voltage exceeds VBR (48.5–53.6 V at 1 mA). Its low dynamic impedance (<1 Ω typical near IPP) ensures stable clamping during high-energy pulses per Figure 5 waveform (tp = 1 ms, tr ≤ 10 µs).
Thermal design relies on junction-to-lead resistance (RJL = 20 °C/W) and steady-state power derating above TL = 75 °C (20 mW/°C), supporting reliable operation up to +175 °C junction temperature. The Surmetic axial leaded package (Case 41A) enables through-hole mounting with 260 °C soldering tolerance at 1/16″ from case.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - sustains single high-energy transients without failure |
| Working Peak Reverse Voltage (VRWM) | 43.6 V - maximum continuous DC or peak AC voltage before leakage exceeds 5 µA |
| Breakdown Voltage (VBR) | 48.5–53.6 V @ 1 mA - precise avalanche onset threshold for predictable clamping initiation |
| Clamping Voltage (VC) | 70.1 V @ 21.4 A IPP - maximum voltage seen by protected circuit during worst-case surge |
| Response Time | <1 ns - limits voltage overshoot before clamping engages, critical for fast-edge transients |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 system-level ESD immunity requirements |
| UL Recognition | UL 497B QVGQ2 - certified for isolated loop circuit protection in telecom and industrial safety-critical designs |
Pinout & Package
Package: Axial-leaded Surmetic plastic case (Case 41A), cathode indicated by polarity band. Dimensions: A = 8.5–9.5 mm length, B = 4.8–5.3 mm diameter, D = 0.96–1.06 mm lead diameter, K = 25.4 mm lead length minimum.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; defines clamping reference point |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., DC input, signal trace); carries full surge current to ground |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse rating | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges without derating |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream MOSFETs, controllers, and interface ICs |
| UL 497B certification | Validates suitability for primary-side isolation barriers in telecom power feeds and PoE injectors |
| Pb-free axial package (RL4 suffix) | Complies with RoHS Directive 2011/65/EU and supports automated through-hole assembly |
| −65 °C to +175 °C operating range | Supports deployment in under-hood automotive modules and industrial motor drive cabinets |
Applications
| Industrial Power Supply Input Protection | Telecom Line Card Surge Suppression |
|---|---|
|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and field wiring transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between +48 V rail and chassis ground to clamp surges before they reach DC-DC converter input capacitors. Use Value: 70.1 V clamping voltage ensures protected buck controller (rated to 60 V abs max) remains within safe operating area during 1500 W surges. |
Use Scenario: T1/E1 interface card in central office equipment subjected to lightning-induced longitudinal surges on twisted-pair lines. IC Role / Device Role / Timing Role: Primary protection element across differential pair, referenced to isolated ground plane per UL 497B requirements. Use Value: UL 497B QVGQ2 recognition confirms compliance with telecom isolation barrier standards for fault current containment. |
| Medical Equipment ESD Protection | Automotive Body Control Module I/O Protection |
|
Use Scenario: Front-panel USB and RS-232 ports on diagnostic imaging console requiring >16 kV HBM ESD immunity per IEC 60601-1-2. IC Role / Device Role / Timing Role: Secondary-level TVS mounted directly at connector pins to shunt ESD current before it couples into signal conditioning ASICs. Use Value: Class 3 ESD rating (>16 kV HBM) and <1 ns response ensure no latch-up or gate oxide damage occurs during contact discharge events. |
Use Scenario: LIN bus transceiver inputs in body control unit exposed to battery disconnect transients and alternator load dump. IC Role / Device Role / Timing Role: Unidirectional clamp on LIN data line referenced to vehicle ground, sized to survive ISO 7637-2 Pulse 1 and Pulse 3a. Use Value: 1500 W rating and 43.6 V VRWM match 12 V automotive nominal systems while providing margin above 14 V charging voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | 600 W rating, SMC package, 70 V VC @ 8.5 A IPP, lower surge capacity | Better suited for space-constrained PCBs where 1500 W is not required | Select SMBJ51A only if peak surge energy is ≤600 W and surface-mount assembly is mandatory |
| 1.5KE51A | Identical electrical specs but in Pb-free box packaging (AG suffix), same Case 41A axial form factor | No functional difference; differs only in shipping format (500-unit box vs. 1500-unit tape & reel) | Choose 1.5KE51A for low-volume prototyping or manual assembly; 1.5KE51ARL4 preferred for automated production |
Compared with SMBJ51A, the 1.5KE51ARL4 delivers 2.5× higher surge energy handling in the same voltage class, enabling fewer devices per rail in high-reliability power entry designs; versus 1.5KE51A, it offers identical protection performance with optimized logistics for SMT placement.
Availability
1.5KE51ARL4 is available at Aetrix Electronics and suitable for industrial power supplies, telecom infrastructure equipment, medical diagnostic interfaces, and automotive body electronics requiring stable component supply across multi-year production cycles.
Supply support for 1.5KE51ARL4 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 (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1.5KE51ARL4 belongs to the Mosorb 1.5KE series - engineered specifically for high-power transient suppression in harsh environments, emphasizing reliability, UL certification, and consistent clamping performance across temperature and lifetime.
FAQ
What is the maximum clamping voltage of the 1.5KE51ARL4 under standard test conditions?
The 1.5KE51ARL4 has a maximum clamping voltage (VC) of 70.1 V when subjected to its rated peak pulse current of 21.4 A, measured using the 1 ms exponential waveform defined in Figure 5 of the datasheet. This value represents the highest voltage the device allows across its terminals during surge conduction and is critical for ensuring protected components remain within their absolute maximum ratings. The 1.5KE51ARL4 maintains this clamping performance across its full operating temperature range.
Does the 1.5KE51ARL4 meet UL 497B requirements for isolated loop protection?
Yes, the 1.5KE51ARL4 is UL 497B recognized under file QVGQ2 for protector classification, as confirmed in the "UL RECOGNITION" section of the official ON Semiconductor datasheet. This certification validates its use in isolated loop circuits such as telecom power feeds and PoE midspans, where galvanic separation and fault current containment are mandated. The 1.5KE51ARL4 achieves this through verified die construction, package integrity, and endurance testing per UL 497B Annex A.
What is the working peak reverse voltage (VRWM) specification for the 1.5KE51ARL4?
The 1.5KE51ARL4 has a working peak reverse voltage (VRWM) of 43.6 V, meaning it can continuously block up to this DC or peak AC voltage while maintaining reverse leakage below 5 µA. This parameter determines the maximum steady-state voltage the device can withstand without entering breakdown, making it essential for selecting appropriate overvoltage margin in 48 V systems or 36 V automotive applications. The 1.5KE51ARL4's VRWM ensures compatibility with common industrial and telecom power rails.
How does the 1.5KE51ARL4 differ from the 1.5KE51A variant?
The 1.5KE51ARL4 and 1.5KE51A share identical electrical specifications, thermal characteristics, and mechanical package (Case 41A axial). Their sole difference lies in packaging format: the "RL4" suffix denotes 1500-unit tape-and-reel delivery optimized for automated pick-and-place, while "A" indicates 500-unit bulk box packaging for manual or low-volume assembly. Both are Pb-free and UL 497B certified, and either may be used interchangeably in circuit design. The 1.5KE51ARL4 is the preferred choice for high-volume manufacturing.
What is the temperature coefficient of breakdown voltage for the 1.5KE51ARL4?
The 1.5KE51ARL4 has a maximum temperature coefficient of breakdown voltage (VBR) of 0.102 %/°C, indicating how VBR changes with junction temperature. This relatively low coefficient ensures stable clamping behavior across the full −65 °C to +175 °C operating range, minimizing drift in protection thresholds during thermal cycling. Designers use this value to calculate worst-case VBR at elevated temperatures - for example, VBR increases by ~5% at +125 °C ambient - ensuring continued margin over protected ICs' absolute maximum ratings.
1.5KE51ARL4 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):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 21.4A
- 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
1.5KE51ARL4 FAQ
1.How can I place an order for 1.5KE51ARL4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE51ARL4 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 1.5KE51ARL4 reliable?
The price and inventory of 1.5KE51ARL4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE51ARL4 is usually 5 days.
3.What payment methods are accepted for 1.5KE51ARL4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE51ARL4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE51ARL4?
1.5KE51ARL4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE51ARL4 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 1.5KE51ARL4?
For technical support, including 1.5KE51ARL4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE51ARL4 requirements.
6.How does Aetrix verify that 1.5KE51ARL4 is sourced from the original manufacturer or authorized distributors?
All 1.5KE51ARL4 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 1.5KE51ARL4 meets industry standards.
7.What is the process for return or replacement of 1.5KE51ARL4?
All 1.5KE51ARL4 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE51ARL4, 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 1.5KE51ARL4 part is unused and in its original packaging.
Return procedure for 1.5KE51ARL4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE51ARL4 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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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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