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onsemi 1.5KE43A
- Part No.:
- 1.5KE43A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1.5KE43A.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,165
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Product details
Overview
1.5KE43A 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 36.8 V working peak reverse voltage (VRWM), 43 V breakdown voltage (VBR) at 1 mA test current, and clamps to 59.3 V at 25.3 A peak pulse current, making it suitable for DC power rail protection in industrial power supplies and communication interfaces.
For engineers reviewing the 1.5KE43A datasheet, pinout, applications, or equivalent options, this axial-leaded TVS diode offers verified UL 497B recognition for isolated loop circuit protection, Class 3 (>16 kV) HBM ESD rating, sub-1 ns response time, low zener impedance, and reliable surge handling in harsh environments requiring robust overvoltage immunity.
Technical Context
The 1.5KE43A operates as a unidirectional avalanche diode with sharp reverse-breakdown characteristics, triggered when transient voltage exceeds its 43 V nominal VBR. Its clamping action limits downstream voltage to ≤59.3 V during 1 ms 25.3 A pulses, enabling effective protection of CMOS, MOS, and bipolar ICs without latch-up or damage.
It uses a Surmetic axial-leaded plastic package (Case 41A) with cathode polarity band marking, rated for 260°C soldering at 10 seconds, and exhibits <5 µA leakage above 10 V at VRWM. Thermal resistance is 20°C/W junction-to-lead, supporting stable operation under repeated surge conditions up to 175°C junction temperature.
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) | 36.8 V - maximum continuous DC or peak AC voltage before clamping initiates |
| Breakdown Voltage (VBR) | 43 V @ 1 mA - precise avalanche threshold for predictable turn-on |
| Clamping Voltage (VC) | 59.3 V @ 25.3 A IPP - maximum voltage seen by protected circuit during surge |
| Leakage Current (IR) | <5 µA @ VRWM - minimal standby power loss and signal interference |
| Response Time | <1 ns - fast enough to suppress ESD and fast-rising transients before IC damage |
| ESD Rating | Class 3 (>16 kV) per HBM - meets stringent electrostatic discharge immunity requirements |
Pinout & Package
1.5KE43A is housed in an axial-leaded Surmetic plastic package (Case 41A), with cathode identified by a colored band. Leads are corrosion-resistant, readily solderable, and rated for 260°C at 10 seconds. Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or common return path in unidirectional clamp configuration |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., VCC, signal line); polarity band marks this terminal |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Validated for isolated loop circuit protection - enables compliance in telecom and industrial safety-critical designs |
| Low Zener Impedance | Enables tight clamping with minimal voltage overshoot during fast transients |
| High Surge Capability | Withstands 1500 W non-repetitive pulses - suitable for lightning-induced surges in outdoor equipment |
| Pb-Free Packaging | RoHS-compliant construction (1.5KE43AG/1.5KE43ARL4G variants) - supports environmental compliance and lead-free assembly |
Applications
| Industrial Power Supply Protection | Telecom Line Interface Protection |
|---|---|
Use Scenario: Protecting 48 V DC input rails in programmable logic controllers (PLCs) against load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to shunt surge energy away from DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤59.3 V, preventing latch-up or permanent damage to 3.3 V/5 V logic and analog front-ends. | Use Scenario: Safeguarding RS-485 transceivers and isolation barriers in building automation networks exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Parallel-connected TVS on differential bus lines (A/B) referenced to signal ground, activated within <1 ns to clamp induced spikes. Use Value: Maintains data integrity by suppressing transients before they exceed receiver common-mode range or damage internal ESD structures. |
| Medical Equipment Input Protection | Automotive Aftermarket Electronics |
Use Scenario: Shielding patient-monitoring device power inputs from ESD events during clinical handling and AC line disturbances. IC Role / Device Role / Timing Role: Primary overvoltage protector on 12–24 V auxiliary supply lines, upstream of LDO regulators and sensor signal chains. Use Value: Provides Class 3 (>16 kV) HBM ESD immunity and UL 497B-certified isolation barrier protection - critical for IEC 60601-1 compliance. | Use Scenario: Protecting GPS modules and infotainment head units connected to vehicle battery rails subject to load dump (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Clamp device mounted directly at connector entry point to absorb 1500 W surge energy before reaching sensitive RF and digital circuitry. Use Value: Clamps to 59.3 V at 25.3 A, ensuring downstream components see no more than 60 V - well below typical 65 V absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A | Surface-mount SMB package (vs. axial lead); 600 W rating (vs. 1500 W); same 43 V VBR and 61.9 V VC | Lower power handling limits use to lower-energy transients; requires PCB layout change and requalification | Select when space-constrained PCB design prioritizes SMT over through-hole and surge threat level is ≤600 W |
| 1.5KE43CA | Bi-directional variant with symmetrical ±43 V breakdown; identical 1500 W rating and Case 41A package | Protects AC-coupled or bidirectional signal lines (e.g., Ethernet PHY, audio) where polarity reversal occurs | Choose only when protecting circuits with reversible voltage polarity - not a drop-in replacement for unidirectional use cases |
Compared with SMBJ43A and 1.5KE43CA, the 1.5KE43A provides highest surge energy absorption in axial form factor, optimized for DC rail clamping where unidirectional protection suffices and board-level mounting flexibility is required.
Availability
1.5KE43A is available at Aetrix Electronics and suitable for industrial power supplies, telecom infrastructure equipment, medical instrumentation, and automotive aftermarket electronics requiring stable component supply and long-term obsolescence management.
Supply support for 1.5KE43A 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, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1.5KE43A belongs to the 1.5KE series of Mosorb™ transient voltage suppressors - engineered specifically for high-reliability, high-surge industrial and communications systems requiring UL-recognized overvoltage protection.
FAQ
What is the clamping voltage of the 1.5KE43A and how is it measured?
The 1.5KE43A has a maximum clamping voltage (VC) of 59.3 V, measured at a peak pulse current (IPP) of 25.3 A with 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 - a critical parameter for ensuring protected ICs remain within their absolute maximum voltage ratings. The 1.5KE43A achieves this clamping performance while maintaining low dynamic impedance and sub-1 ns response time.
Is the 1.5KE43A RoHS compliant and what packaging options exist?
Yes, the 1.5KE43A is available in RoHS-compliant, Pb-free versions: 1.5KE43AG (500-unit box) and 1.5KE43ARL4G (1500-unit tape-and-reel). Both retain identical electrical specifications and Case 41A axial package dimensions. The "G" suffix explicitly denotes Pb-free construction per ON Semiconductor's compliance documentation, and the device meets JEDEC standards for lead-free soldering at 260°C for 10 seconds.
How does the 1.5KE43A differ from the bi-directional 1.5KE43CA?
The 1.5KE43A is unidirectional - it conducts only during positive transients relative to its cathode - whereas the 1.5KE43CA is bi-directional with symmetrical ±43 V breakdown. Their surge ratings (1500 W), package (Case 41A), and thermal specs are identical, but the 1.5KE43CA must be used where AC signals or polarity-reversing transients occur. Substituting 1.5KE43CA for 1.5KE43A in a DC rail application introduces unnecessary conduction during normal negative excursions and is not recommended.
What is the maximum operating temperature and thermal derating behavior of the 1.5KE43A?
The 1.5KE43A supports an operating junction temperature range of −65°C to +175°C. Its steady-state power dissipation is rated at 5.0 W at TL = 75°C with 3/8″ lead length, derating linearly at 20 mW/°C above that temperature. Junction-to-lead thermal resistance is 20°C/W, enabling effective heat transfer to PCB copper or heatsinking leads. For pulsed operation, peak power remains 1500 W at TL ≤ 25°C but must be derated per Figure 2 in the datasheet when ambient or lead temperature rises.
Does the 1.5KE43A have UL recognition and for which standard?
Yes, the 1.5KE43A carries Underwriters Laboratories (UL) Recognition under standard UL 497B for isolated loop circuit protection (File #E210057, QVGQ2 category). This certification covers rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge performance - confirming suitability for safety-critical telecom, industrial control, and medical applications where regulatory compliance is mandatory. UL recognition applies to the full 1.5KE6.8A–1.5KE250A series.
1.5KE43A 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):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 25.3A
- 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
1.5KE43A FAQ
1.How can I place an order for 1.5KE43A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43A 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 1.5KE43A reliable?
The price and inventory of 1.5KE43A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE43A is usually 5 days.
3.What payment methods are accepted for 1.5KE43A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43A?
1.5KE43A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43A 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 1.5KE43A?
For technical support, including 1.5KE43A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43A requirements.
6.How does Aetrix verify that 1.5KE43A is sourced from the original manufacturer or authorized distributors?
All 1.5KE43A 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 1.5KE43A meets industry standards.
7.What is the process for return or replacement of 1.5KE43A?
All 1.5KE43A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43A, 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 1.5KE43A part is unused and in its original packaging.
Return procedure for 1.5KE43A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE43A Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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