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onsemi 1.5KE56ARL4
- Part No.:
- 1.5KE56ARL4
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1.5KE56ARL4.pdf
- Description:
- TVS DIODE 47.8VWM 77VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,535
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Product details
Overview
1.5KE56ARL4 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 47.8 V working peak reverse voltage (VRWM), 56 V breakdown voltage (VBR) at 1 mA test current, and clamps to 77 V at 19.5 A peak pulse current (IPP), making it suitable for DC power rail protection in industrial power supplies and communication interfaces.
For engineers reviewing the 1.5KE56ARL4 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC VMAX, VRWM alignment with steady-state operating 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 with fast <1 ns response time and low dynamic impedance, enabling effective suppression of sub-microsecond transients. Its unidirectional configuration provides reverse-biased clamping only, requiring correct polarity placement across the protected line-to-ground path.
The 1.5KE56ARL4 uses a Surmetic axial-leaded plastic package (Case 41A) with void-free molding and Pb-free terminations, rated for 260°C soldering at 10 seconds. Thermal resistance from junction-to-lead is 20°C/W, supporting reliable power dissipation up to 5.0 W at 75°C lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - withstands high-energy surges without failure in telecom or industrial environments |
| Working Peak Reverse Voltage (VRWM) | 47.8 V - maximum continuous DC or peak AC voltage the device blocks before clamping begins |
| Breakdown Voltage (VBR) | 56 V @ 1 mA - precise avalanche onset threshold ensuring predictable clamping activation |
| Clamping Voltage (VC) | 77 V @ 19.5 A IPP - maximum voltage seen by protected circuit during worst-case 1 ms transient |
| Leakage Current (IR) | <5 µA @ 47.8 V - negligible standby power loss and minimal interference on signal/power lines |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 for system-level ESD immunity |
| UL Recognition | UL 497B QVGQ2 - certified for use in isolated loop circuits including analog I/O and fieldbus interfaces |
Pinout & Package
Package: Axial-leaded Surmetic plastic case (Case 41A), cathode indicated by 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 minimum lead length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or common reference; completes clamping path during transient |
| Cathode | High-side connection point | Marked with band; connects to protected line (e.g., +VDC, RS-485 A/B); conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1 ns - limits voltage overshoot before clamping engages, critical for protecting fast CMOS/MOS inputs |
| Low zener impedance | Dynamic impedance minimized via optimized doping profile - ensures stable VC across varying IPP |
| Pb-free axial package | RoHS-compliant Surmetic Case 41A - supports automated through-hole assembly and reflow-compatible termination |
| High surge reliability | Rated for ≥1000 non-repetitive 1 ms pulses at full PPK - validated for long-term deployment in harsh industrial settings |
Applications
| Industrial Power Supply Protection | RS-485/422 Interface Protection |
|---|---|
Use Scenario: DC output rails (e.g., +48 V telecom supply) exposed to load dump or inductive kickback. IC Role / Device Role: Unidirectional shunt clamp placed between rail and chassis ground. Use Value: Limits transient excursions to ≤77 V, preserving integrity of downstream DC-DC converters and microcontrollers rated for 60 V absolute max. |
Use Scenario: Differential data lines in factory automation networks subject to cable-induced surges. IC Role / Device Role: Paired TVS devices (one per line) referenced to signal ground per UL 497B isolated loop requirements. Use Value: Maintains signal integrity below 77 V while meeting IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity without degrading data rate. |
| Medical Equipment Input Protection | Programmable Logic Controller (PLC) Analog I/O |
Use Scenario: Mains-connected patient-monitoring devices requiring reinforced isolation and low leakage. IC Role / Device Role: Primary overvoltage clamp on secondary-side DC bias rails feeding op-amp front-ends. Use Value: Delivers <5 µA leakage at 47.8 V, preventing measurement drift while providing Class 3 ESD robustness per IEC 60601-1-2. |
Use Scenario: 4–20 mA current loop inputs exposed to field wiring faults and electrostatic discharge. IC Role / Device Role: Line-to-ground TVS on input terminals, coordinated with series current-limiting resistor. Use Value: Clamps transients before they exceed 77 V, protecting precision DACs and isolators without affecting loop accuracy or zero-point calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58A | 600 W rating, SMC package, 58 V VBR, 93.6 V VC @ 6.4 A IPP | Lower power handling; surface-mount only; unsuitable for high-energy 1500 W surges | Select when board space is constrained and surge energy is ≤600 W (e.g., consumer USB ports) |
| 1.5SMC56A | 1500 W rating, SMC package, 56 V VBR, 87 V VC @ 17.2 A IPP | Higher clamping voltage (+10 V) and surface-mount form factor; no UL 497B recognition | Choose for cost-sensitive industrial PCBs where UL certification is not mandated and layout allows SMD placement |
Compared with SMBJ58A and 1.5SMC56A, the 1.5KE56ARL4 offers superior surge energy absorption, axial-leaded through-hole mounting for high-reliability mechanical retention, and UL 497B listing essential for certified isolated loop designs-making it the preferred choice for mission-critical industrial and medical power and interface protection.
Availability
1.5KE56ARL4 is available at Aetrix Electronics and suitable for industrial power supplies, RS-485 communication systems, medical equipment front-ends, and programmable logic controller analog I/O modules requiring stable component supply and long-term lifecycle support.
Supply support for 1.5KE56ARL4 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 solutions for automotive, industrial, cloud power, and IoT applications.
The 1.5KE56ARL4 belongs to the 1.5KE Series Mosorb TVS family, engineered specifically for high-reliability, high-energy transient suppression in industrial-grade power conversion and data interface circuits where UL recognition and axial mechanical robustness are required.
FAQ
What is the clamping voltage of the 1.5KE56ARL4 and how is it measured?
The 1.5KE56ARL4 has a maximum clamping voltage (VC) of 77 V, measured at a peak pulse current (IPP) of 19.5 A using a 1 ms exponential waveform per Figure 5 in the datasheet. This value represents the highest voltage the device allows across its terminals during a standardized surge event, directly defining the protection level for downstream components. The 1.5KE56ARL4 maintains this VC consistently due to its low dynamic impedance and thermally stable silicon structure.
Does the 1.5KE56ARL4 meet UL 497B requirements for isolated loop circuits?
Yes, the 1.5KE56ARL4 is explicitly listed under UL 497B (File #E210057, QVGQ2 category) for isolated loop circuit protection. This certification confirms successful completion of Strike Voltage Breakdown, Endurance Conditioning, Dielectric Withstand, and Discharge tests-validating its suitability in safety-critical analog I/O, fieldbus, and medical isolation barrier applications where regulatory compliance is mandatory.
What is the difference between VRWM and VBR for the 1.5KE56ARL4?
For the 1.5KE56ARL4, VRWM (Working Peak Reverse Voltage) is 47.8 V-the maximum steady-state voltage the device blocks without significant leakage. VBR (Breakdown Voltage) is 56 V, measured at 1 mA test current, marking the onset of controlled avalanche conduction. The 8.2 V margin between them ensures reliable blocking during normal operation while guaranteeing rapid, repeatable clamping when transients exceed VRWM.
Can the 1.5KE56ARL4 be used in bidirectional protection configurations?
No, the 1.5KE56ARL4 is a unidirectional TVS diode and must be used with correct polarity: cathode to the protected line, anode to ground. For bidirectional protection (e.g., AC lines or differential pairs), two 1.5KE56ARL4 devices in series opposition or a dedicated bidirectional part like 1.5KE56A (not RLP4) would be required. Using a single 1.5KE56ARL4 in reverse orientation risks permanent damage during forward surges.
What is the thermal resistance and power derating behavior of the 1.5KE56ARL4?
The 1.5KE56ARL4 has a junction-to-lead thermal resistance (RJL) of 20°C/W and a steady-state power dissipation (PD) of 5.0 W at TL = 75°C, derating linearly above that temperature at 20 mW/°C. This means at 100°C lead temperature, usable PD drops to 4.5 W. The axial Surmetic package enables efficient heat transfer to PCB copper or heatsinks, supporting sustained operation in enclosed industrial enclosures.
1.5KE56ARL4 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):
- 47.8V
- Voltage - Breakdown (Min):
- 53.2V
- Voltage - Clamping (Max) @ Ipp:
- 77V
- Current - Peak Pulse (10/1000µs):
- 19.5A
- 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
1.5KE56ARL4 FAQ
1.How can I place an order for 1.5KE56ARL4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE56ARL4 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 1.5KE56ARL4 reliable?
The price and inventory of 1.5KE56ARL4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE56ARL4 is usually 5 days.
3.What payment methods are accepted for 1.5KE56ARL4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE56ARL4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE56ARL4?
1.5KE56ARL4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE56ARL4 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 1.5KE56ARL4?
For technical support, including 1.5KE56ARL4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE56ARL4 requirements.
6.How does Aetrix verify that 1.5KE56ARL4 is sourced from the original manufacturer or authorized distributors?
All 1.5KE56ARL4 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 1.5KE56ARL4 meets industry standards.
7.What is the process for return or replacement of 1.5KE56ARL4?
All 1.5KE56ARL4 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE56ARL4, 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 1.5KE56ARL4 part is unused and in its original packaging.
Return procedure for 1.5KE56ARL4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE56ARL4 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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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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