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onsemi 1.5KE27A
- Part No.:
- 1.5KE27A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1.5KE27A.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,223
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Product details
Overview
1.5KE27A 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 23.1 V working peak reverse voltage (VRWM), 27 V nominal breakdown voltage (VBR), and clamps to ≤37.5 V at 40 A peak pulse current (IPP), making it suitable for DC power rail protection in industrial power supplies and communication interfaces.
For engineers reviewing the 1.5KE27A datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin over operating voltage, clamping ratio (VC/VBR), surge current capability at 1 ms, UL 497B recognition for isolated loop circuits, and axial leaded Surmetic package compatibility with through-hole PCB assembly.
Technical Context
The 1.5KE27A operates as a silicon avalanche diode with fast turn-on response (<1 ns), low dynamic impedance, and stable breakdown characteristics across temperature. Its unidirectional configuration provides reverse-biased clamping only, requiring correct polarity placement relative to protected circuitry.
It is rated for 1500 W non-repetitive peak pulse power per 1 ms waveform (Figure 5), with thermal derating above 75°C lead temperature and steady-state dissipation limited to 5.0 W. The device meets Class 3 ESD immunity (>16 kV HBM) and is UL 497B recognized for isolated loop circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 23.1 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC bus or signal swing. |
| VBR @ IT = 1 A | 25.7–28.4 V - Breakdown occurs within this range at 1 mA test current; defines threshold for avalanche conduction. |
| VC @ IPP = 40 A | ≤37.5 V - Clamped voltage during 1 ms surge; determines maximum stress on downstream ICs. |
| IPP | 40 A - Peak pulse current supported at 1 ms; defines surge energy handling (≈30 J). |
| IR @ VRWM | ≤5 µA - Reverse leakage at working voltage; ensures minimal standby power loss and signal integrity. |
| Response Time | <1 ns - Enables suppression before transient propagates into protected circuitry. |
| UL Recognition | UL 497B QVGQ2 - Certified for use in isolated loop telecom and industrial interface protection. |
Pinout & Package
Package: Axial leaded Surmetic plastic case (Case 41A), Pb-free, cathode indicated by band. Dimensions: 8.5–9.5 mm length × 4.8–5.3 mm diameter. Mounting position unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node in clamping configuration. |
| Cathode | High-side clamping terminal | Connected to protected line (e.g., VCC, signal); polarity band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Supports high-energy transients (e.g., IEC 61000-4-5 Level 4) without failure. |
| Clamping ratio VC/VBR ≈ 1.39 | Ensures tight voltage limiting-critical for protecting 3.3 V/5 V logic and analog front-ends. |
| ESD rating >16 kV HBM | Meets IEC 61000-4-2 Level 4 for system-level ESD robustness without external shielding. |
| UL 497B certification | Validated for safety-critical isolated loop applications including RS-485, CAN, and fieldbus interfaces. |
| Low zener impedance & fast response | Minimizes overshoot and enables effective protection even with short trace lengths. |
Applications
| Industrial Power Supply Protection | RS-485 Interface Protection |
|---|---|
Use Scenario: Protecting 24 V DC input rails in PLC power modules against load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp surges before they reach DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤37.5 V, preventing latch-up or permanent damage to 36 V-rated input stages. | Use Scenario: Safeguarding RS-485 transceivers in factory automation networks exposed to ground potential differences and cable ESD. IC Role / Device Role / Timing Role: Paired TVS devices (one per line) referenced to common-mode ground, suppressing differential and common-mode transients. Use Value: Maintains signal integrity under ±15 kV contact discharge while meeting UL 497B isolation barrier requirements. |
| Medical Equipment Input Protection | AC-DC Adapter Secondary-Side Clamp |
Use Scenario: Securing auxiliary 12 V supply inputs in diagnostic imaging systems where reliability is critical. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC output, upstream of LDO regulators and sensor interfaces. Use Value: Withstands repetitive 10/1000 µs surges up to 40 A, ensuring uninterrupted operation during hospital-grade surge events. | Use Scenario: Clamping flyback voltage spikes on transformer secondary windings in offline AC-DC adapters. IC Role / Device Role / Timing Role: Snubber-type TVS across rectifier output to absorb leakage inductance energy during MOSFET turn-off. Use Value: Reduces voltage stress on output capacitors and rectifiers, improving long-term reliability and reducing audible noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Lower peak power (600 W), SMC package (surface-mount), VRWM = 24 V, VC = 38.9 V @ 15.4 A | Better suited for space-constrained PCBs; lower surge rating limits use in high-energy industrial environments. | Select when board area is constrained and surge threat level is moderate (e.g., consumer-grade I/O). |
| P6KE27A | Same axial package, lower peak power (600 W), identical VRWM/VBR/VC specs, but rated for 23.3 A IPP | Limited to lower-energy transients; not UL 497B recognized; lacks Class 3 ESD rating. | Acceptable for cost-sensitive legacy designs where full 1500 W capability and safety certification are not required. |
Compared with SMBJ24A and P6KE27A, the 1.5KE27A delivers 2.5× higher surge energy handling, UL 497B certification for isolated loops, and Class 3 ESD robustness-making it the preferred choice for mission-critical industrial and medical power rail protection where reliability and compliance are mandatory.
Availability
1.5KE27A is available at Aetrix Electronics and suitable for industrial power supplies, RS-485 communication interfaces, medical equipment inputs, and AC-DC adapter secondary-side clamping requiring stable component supply and long-term lifecycle support.
Supply support for 1.5KE27A 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 part of onsemi) is a global semiconductor supplier focused on energy-efficient electronics, delivering high-performance silicon solutions for automotive, industrial, cloud, and IoT applications.
The 1.5KE27A belongs to the Mosorb™ 1500 W TVS family, engineered specifically for robust, standards-compliant transient suppression in harsh electrical environments-including UL 497B-certified isolated loop systems and high-reliability power infrastructure.
FAQ
What is the working peak reverse voltage (VRWM) of the 1.5KE27A?
The 1.5KE27A has a working peak reverse voltage (VRWM) of 23.1 V. This value represents the maximum continuous DC or peak AC voltage the device can withstand in reverse bias without entering avalanche conduction. It is selected to be ≥10–15% above the normal operating voltage of the protected line-ensuring reliable blocking during steady-state operation while allowing prompt clamping during transients.
How does the 1.5KE27A compare to bidirectional TVS diodes in surge protection?
The 1.5KE27A is unidirectional and functions only in reverse bias, making it ideal for DC power rail protection where polarity is fixed. Unlike bidirectional variants, it avoids forward conduction during normal operation, eliminating unwanted current paths. For AC or differential signal lines (e.g., RS-485), two 1.5KE27A devices may be used back-to-back-or a dedicated bidirectional TVS selected-but the 1.5KE27A itself is not rated for symmetrical clamping.
Is the 1.5KE27A RoHS compliant and halogen-free?
Yes, the 1.5KE27A is offered in Pb-free (RoHS-compliant) packaging, indicated by the "G" suffix in part numbers like 1.5KE27AG. ON Semiconductor confirms compliance with EU RoHS Directive 2011/65/EU and follows JEDEC JS709C for halogen content. Full material declarations and test reports are available via onsemi's product change notifications and compliance portal.
What is the maximum clamping voltage (VC) of the 1.5KE27A at its rated peak pulse current?
The 1.5KE27A clamps to a maximum of 37.5 V at its rated peak pulse current of 40 A (1 ms exponential decay waveform per Figure 5). This VC value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuitry during worst-case transient events-critical for ensuring downstream components remain within absolute maximum ratings.
Can the 1.5KE27A be used in place of the older 1N6281AG?
Yes-the 1.5KE27A and 1N6281AG are functionally identical parts; 1N6281AG is the JEDEC registered device code for the same silicon and package. Both share identical electrical specifications, mechanical dimensions (Case 41A), and UL 497B recognition. The "1.5KE" prefix denotes ON Semiconductor's proprietary part numbering, while "1N6281AG" reflects industry-standard JEDEC nomenclature.
1.5KE27A 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):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- 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
1.5KE27A FAQ
1.How can I place an order for 1.5KE27A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE27A 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 1.5KE27A reliable?
The price and inventory of 1.5KE27A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE27A is usually 5 days.
3.What payment methods are accepted for 1.5KE27A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE27A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE27A?
1.5KE27A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE27A 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 1.5KE27A?
For technical support, including 1.5KE27A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE27A requirements.
6.How does Aetrix verify that 1.5KE27A is sourced from the original manufacturer or authorized distributors?
All 1.5KE27A 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 1.5KE27A meets industry standards.
7.What is the process for return or replacement of 1.5KE27A?
All 1.5KE27A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE27A, 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 1.5KE27A part is unused and in its original packaging.
Return procedure for 1.5KE27A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE27A Tags
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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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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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