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onsemi 1.5KE43CA
- Part No.:
- 1.5KE43CA
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE43CA.pdf
- Description:
- TRANS VOLTAGE SUPPRESSOR DIODE,
- Quantity:
- Payment:
- Shipping:
Inventory:1,752
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Product details
Overview
1.5KE43CA from ON Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against ESD, lightning surges, and inductive switching transients. It features a 36.8 V working peak reverse voltage (VRWM), 43 V nominal breakdown voltage (VBR), 59.3 V maximum clamping voltage (VC) at 25.3 A peak pulse current (IPP), and 1500 W peak pulse power rating at 1 ms. It is widely used in AC/DC power supply input stages to safeguard rectifier bridges and downstream regulators.
For engineers reviewing the 1.5KE43CA datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected circuit's absolute maximum rating, VRWM alignment with steady-state operating voltage, UL 497B certification for isolated loop compliance, and axial leaded Case 41A package suitability for through-hole surge protection layouts.
Technical Context
The 1.5KE43CA operates as a bidirectional Zener-based TVS, leveraging avalanche breakdown in both polarities to clamp transient overvoltages symmetrically. Its low dynamic impedance ensures stable clamping performance across varying surge amplitudes, while its <1 ns response time enables effective suppression before downstream ICs experience overstress.
It is rated for non-repetitive 1500 W pulses per the 10/1000 μs waveform (Figure 4), with thermal derating applied above 25°C ambient or 75°C lead temperature. The device meets UL 497B for isolated loop circuit protection and exhibits Class 3 ESD immunity (>16 kV HBM), confirming robustness in industrial and telecom environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 36.8 V - Maximum continuous reverse voltage the device blocks without significant leakage; must exceed system DC bus or AC peak voltage. |
| VBR @ IT = 1 mA | 40.9–45.2 V - Breakdown occurs within this range; defines onset of clamping action during overvoltage events. |
| VC @ IPP = 25.3 A | 59.3 V - Maximum voltage seen by protected circuit during full-rated 1 ms surge; determines required voltage headroom. |
| IPP | 25.3 A - Peak current the device safely shunts at 1 ms pulse width; used with source impedance to estimate clamping level. |
| Peak Pulse Power | 1500 W @ 1 ms - Energy-handling capability per single transient; derates with shorter pulse widths or elevated temperatures. |
| Leakage Current @ VRWM | <5 μA - Negligible standby power loss; avoids loading of high-impedance sensing or bias networks. |
| Response Time | <1 ns - Enables clamping before fast transients (e.g., ESD, relay bounce) propagate into ICs. |
Pinout & Package
1.5KE43CA uses an axial-leaded, void-free thermosetting plastic package (Case 41A), with cathode band marking indicating the P-N junction orientation but not functional polarity due to bidirectional operation. Leads are solderable per JEDEC J-STD-020, with max soldering temperature of 230°C at 1/16″ from case for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Current entry point during negative transients | Connects to line or signal being protected; forms symmetrical clamping path with cathode during either polarity surge. |
| Cathode (Lead 2, banded end) | Current entry point during positive transients | Same physical role as anode under reverse polarity; bidirectional symmetry eliminates need for polarity-aware layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or floating circuits without polarity constraints-ideal for telecom line interfaces and transformer-isolated supplies. |
| UL 497B recognition | Validated for isolated loop protection in safety-critical systems such as medical equipment and industrial controllers. |
| 1500 W surge rating | Handles high-energy lightning-induced surges per IEC 61000-4-5 Level 4 (4 kV/2 Ω) when properly coordinated with series impedance. |
| Class 3 ESD immunity | Withstands >16 kV contact discharge per HBM-reduces need for additional ESD protection on front-end connectors. |
| Low zener impedance | Ensures minimal voltage overshoot during fast-rising transients, preserving timing margins in digital control circuits. |
Applications
| AC/DC Power Supply Input Protection | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Installed across AC mains input or post-bridge DC bus to absorb lightning surges and load dump spikes. IC Role / Device Role / Timing Role: Voltage-clamping protector placed in parallel with rectifier bridge or bulk capacitor. Use Value: Limits transient voltage to ≤59.3 V, preventing overvoltage failure of bridge diodes and primary-side controller ICs. | Use Scenario: Mounted at terminal block or connector of 4–20 mA analog input channel in programmable logic controller. IC Role / Device Role / Timing Role: Bidirectional shunt limiter guarding ADC front-end and signal conditioning op-amps. Use Value: Clamps induced surges from field wiring without polarity concerns, maintaining signal integrity and avoiding ADC saturation or latch-up. |
| Telecom Line Interface Protection | Medical Equipment Isolated Power Monitoring |
Use Scenario: Applied across tip/ring lines of POTS or DSL interface to suppress induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Primary surge arrestor in UL 497B-compliant isolated loop protection network. Use Value: Meets UL 497B requirements for isolation barrier protection, enabling certification of telecom terminal equipment. | Use Scenario: Used on secondary side of isolated DC-DC converter supplying microcontroller and sensor rails in patient-connected devices. IC Role / Device Role / Timing Role: Secondary-side transient suppressor ensuring safe voltage levels despite primary-side fault coupling. Use Value: Provides redundant overvoltage protection aligned with IEC 60601-1 creepage/clearance and isolation integrity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA | Surface-mount SMB package; lower 600 W peak power; same 36.8 V VRWM and 59.3 V VC. | Designed for PCB space-constrained designs; lacks axial lead mechanical robustness for high-vibration environments. | Select SMBJ43CA only when automated SMT assembly and board area savings outweigh need for manual through-hole serviceability and higher surge endurance. |
| 1.5SMC43CA | Surface-mount SMC package; identical 1500 W rating and electrical specs; slightly larger footprint than SMBJ but smaller than axial 1.5KE. | Offers SMT compatibility with near-equivalent surge handling; requires rework-friendly pad design due to thermal mass. | Choose 1.5SMC43CA when balancing surge robustness and SMT manufacturability-ideal for industrial gateways and motor drives with mixed-technology boards. |
Compared with 1.5KE43CA, SMBJ43CA trades mechanical ruggedness and surge margin for compactness, while 1.5SMC43CA delivers matching 1500 W capability in a surface-mount format-making it the preferred drop-in alternative where board real estate and assembly method permit.
Availability
1.5KE43CA is available at Aetrix Electronics and suitable for AC/DC power supplies, industrial PLCs, telecom line interfaces, and medical isolated power systems requiring stable component supply and long-term obsolescence management.
Supply support for 1.5KE43CA 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 energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1.5KExxCA series belongs to ON Semiconductor's Mosorb™ transient voltage suppressor product line, engineered specifically for high-reliability, high-energy surge protection in harsh electromagnetic environments.
FAQ
What is the clamping voltage of the 1.5KE43CA under maximum rated surge current?
The 1.5KE43CA has a maximum clamping voltage (VC) of 59.3 V when subjected to its rated peak pulse current (IPP) of 25.3 A with a 1 ms exponential waveform. This value is measured per Figure 4 in the datasheet and represents the upper limit of voltage the protected circuit will experience during a full-rated transient event. Designers must ensure all downstream components have absolute maximum voltage ratings exceeding 59.3 V to guarantee survivability.
Is the 1.5KE43CA unidirectional or bidirectional, and how does that affect circuit placement?
The 1.5KE43CA is a bidirectional TVS diode, indicated by the "CA" suffix, meaning it clamps overvoltages of either polarity symmetrically. Unlike unidirectional devices, it requires no polarity awareness during placement-either lead may connect to line or ground. This simplifies layout in AC-coupled or floating systems such as telecom line interfaces and isolated power rails, eliminating risk of reverse installation.
Does the 1.5KE43CA meet UL 497B, and why does that matter for my design?
Yes, the 1.5KE43CA is UL 497B recognized (File #116110) for isolated loop circuit protection. This certification validates performance in critical tests including strike voltage breakdown, endurance conditioning, and dielectric withstand-ensuring reliability in safety-isolated systems like medical equipment and industrial controls. Using a UL 497B-certified part helps streamline end-product safety approvals and reduces validation burden.
What is the maximum steady-state power dissipation for the 1.5KE43CA, and how is it derated?
The 1.5KE43CA has a steady-state power dissipation (PD) rating of 5.0 W at TL ≤ 75°C with 3/8″ lead length, derating linearly at 20 mW/°C above that temperature. This rating applies only to continuous DC or low-frequency reverse bias-not transient suppression. In normal operation, leakage current remains below 5 μA at VRWM, resulting in negligible steady-state power (<0.2 mW), so thermal design focuses solely on transient energy absorption.
Can the 1.5KE43CA be used in place of the 1.5KE40CA or 1.5KE47CA without redesigning the PCB?
No-while 1.5KE43CA, 1.5KE40CA, and 1.5KE47CA share identical Case 41A packaging and axial lead form factor, their VRWM (36.8 V vs. 34.2 V vs. 40.2 V), VBR, and VC differ meaningfully. Substituting without verifying clamping margin relative to protected circuit's voltage rating risks under-clamping (failure to protect) or over-clamping (exceeding IC limits). Always validate replacement against actual surge profile and system voltage tolerances.
1.5KE43CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 26A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -50°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE43CA FAQ
1.How can I place an order for 1.5KE43CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43CA 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 1.5KE43CA reliable?
The price and inventory of 1.5KE43CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE43CA is usually 5 days.
3.What payment methods are accepted for 1.5KE43CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43CA?
1.5KE43CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43CA 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 1.5KE43CA?
For technical support, including 1.5KE43CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43CA requirements.
6.How does Aetrix verify that 1.5KE43CA is sourced from the original manufacturer or authorized distributors?
All 1.5KE43CA 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 1.5KE43CA meets industry standards.
7.What is the process for return or replacement of 1.5KE43CA?
All 1.5KE43CA units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43CA, 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 1.5KE43CA part is unused and in its original packaging.
Return procedure for 1.5KE43CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE43CA 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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