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onsemi 1.5KE43AG
- Part No.:
- 1.5KE43AG
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE43AG.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:25,670
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Product details
Overview
1.5KE43AG 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 nominal breakdown voltage (VBR), 59.3 V maximum clamping voltage (VC) at 25.3 A peak pulse current (IPP), and <1 ns response time - deployed in power supplies, industrial controls, and medical equipment.
For engineers reviewing the 1.5KE43AG datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin relative to protected IC VDD, VRWM compatibility with DC bus voltage, surge current handling under IEC 61000-4-5 waveforms, and axial lead (Case 41A) mounting constraints in high-reliability PCB layouts.
Technical Context
This device operates as a silicon avalanche diode, entering conduction when reverse voltage exceeds its specified VBR (40.9–45.2 V at 1 mA test current). Its low dynamic impedance ensures stable clamping during multi-kW transients, while the Surmetic axial package provides robust thermal dissipation (RJL = 20 °C/W) and UL 497B certification for isolated loop circuit protection.
It delivers 1500 W nonrepetitive peak power at TL ≤ 25°C with 1 ms pulse width per Figure 5, derating linearly above 75°C ambient. The 0.101 %/°C VBR temperature coefficient enables predictable performance across −65°C to +175°C operating range, critical for automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 36.8 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC rail by ≥10% to avoid leakage-induced heating. |
| VBR @ IT=1 mA | 40.9–45.2 V - Breakdown voltage tolerance band; defines minimum and maximum voltage at which avalanche conduction initiates reliably. |
| VC @ IPP=25.3 A | 59.3 V - Clamping voltage under full 1500 W surge; determines maximum stress imposed on downstream components during transient events. |
| IPP | 25.3 A - Peak pulse current corresponding to 1500 W at VC; used to size series impedance (e.g., fuse, resistor) to limit energy delivered to the TVS. |
| Response Time | <1 ns - Time from transient onset to clamping onset; ensures protection of fast-edge logic and high-speed interfaces without overshoot degradation. |
| Leakage Current @ VRWM | <5 µA - Reverse leakage at rated working voltage; negligible power loss in standby, suitable for battery-backed or low-power systems. |
| Package | Case 41A axial lead - Standard DO-15 outline (8.5–9.5 mm length × 4.8–5.3 mm diameter); compatible with through-hole wave soldering and manual rework. |
Pinout & Package
1.5KE43AG uses a two-terminal axial lead package (Case 41A, DO-15 equivalent), with cathode identified by a polarity band. No internal circuitry or active control pins - terminals serve purely as anode and cathode for bidirectional blocking/unidirectional clamping operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction; connected to ground or low-side reference in unidirectional clamp configuration. | Provides return path for surge current; must be routed with minimal inductance to maintain clamping integrity below VC. |
| Cathode | Current exit terminal during reverse avalanche clamping; connected to protected line (e.g., VIN, signal line). | Carries full IPP during transient; polarity band marking prevents misorientation that would disable protection function. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables single-device protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges without cascading devices or external current sharing. |
| UL 497B recognition | Validated for use in telecom and industrial isolated loop circuits - satisfies safety agency requirements for surge protector classification (QVGQ2, File #E210057). |
| ESD rating >16 kV HBM | Meets IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) without additional ESD diodes, reducing BOM count in front-end interfaces. |
| Pb-free Surmetic package | RoHS-compliant thermoset plastic housing with corrosion-resistant leads; supports lead-free reflow and wave soldering up to 260°C for 10 s at 1/16″ from case. |
| Low zener impedance | Minimizes voltage overshoot during fast-rising transients (<1 ns), preserving timing margins in microcontroller reset lines and sensor analog inputs. |
Applications
| Industrial Power Supply Input Protection | Medical Equipment ESD Shielding |
|---|---|
Use Scenario: 1.5KE43AG placed across AC-DC converter input stage to absorb line-to-line surges from utility grid switching or nearby motor loads. IC Role / Device Role / Timing Role: Unidirectional clamping diode shunting transient energy to ground, limiting input voltage to ≤59.3 V during 1 ms surges. Use Value: Prevents overvoltage damage to bridge rectifier, bulk capacitor, and primary-side controller ICs without requiring active crowbar circuits or MOVs with aging concerns. | Use Scenario: Mounted on patient-monitor front-panel USB and analog sensor connectors to suppress ESD events per IEC 61000-4-2. IC Role / Device Role / Timing Role: Fast-response TVS diode clamping human-body-model discharges before they reach precision ADCs or isolation amplifiers. Use Value: Maintains signal integrity and avoids latch-up in low-voltage analog front-ends while meeting Class 3 (>16 kV) ESD immunity requirements. |
| Programmable Logic Controller I/O Protection | Automotive Body Control Module Power Rail |
Use Scenario: Installed on 24 V DC digital input channels of PLC modules to withstand inductive kickback from solenoid and relay coils. IC Role / Device Role / Timing Role: Transient suppressor absorbing repetitive 100–200 A spikes with <1 ns turn-on, protecting optocoupler input stages. Use Value: Eliminates need for RC snubbers or varistors, reducing component count and enabling compact DIN-rail mount designs with long-term reliability. | Use Scenario: Applied across 12 V battery feed to BCM microcontroller power domain to survive load-dump transients per ISO 7637-2 Pulse 5a (up to 60 V, 100 ms). IC Role / Device Role / Timing Role: Primary overvoltage clamp limiting supply rail excursion to 59.3 V during sustained surges, safeguarding 3.3 V LDO regulators and CAN transceivers. Use Value: Provides first-line defense without derating issues common with Zener diodes, supporting AEC-Q200 stress testing compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A | Surface-mount SMB package (3.5 × 4.6 mm), same VRWM (36.8 V) and VC (59.3 V), but lower 600 W peak power rating. | Requires PCB real estate optimization and reflow process; unsuitable for high-energy surges exceeding 600 W. | Select SMBJ43A only when board space is constrained and surge threat level is limited to IEC 61000-4-5 Level 2. |
| 1.5KE43A | Identical electrical specs and Case 41A package, but RoHS-noncompliant (lead-containing terminations). | No functional difference; not acceptable for EU/China RoHS-regulated products or new designs targeting green compliance. | Choose 1.5KE43AG over 1.5KE43A for all new designs requiring Pb-free manufacturing and global market access. |
Compared with SMBJ43A and 1.5KE43A, the 1.5KE43AG delivers full 1500 W surge capability in a RoHS-compliant axial package - making it optimal for high-energy, through-hole–based industrial and automotive power rail protection where thermal mass and mechanical robustness are prioritized over footprint size.
Availability
1.5KE43AG is available at Aetrix Electronics and suitable for industrial power supplies, medical instrumentation, programmable logic controllers, and automotive body control modules requiring stable component supply with full UL 497B and RoHS compliance.
Supply support for 1.5KE43AG 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 specializing in power management, analog, sensors, and discrete devices for automotive, industrial, cloud, and IoT applications.
The 1.5KE43AG belongs to the 1.5KE Series Mosorb TVS family - engineered for high-reliability, high-energy transient suppression in harsh environments where axial-leaded robustness and UL-certified protection are mandatory.
FAQ
What is the maximum clamping voltage of the 1.5KE43AG under surge conditions?
The 1.5KE43AG has a maximum clamping voltage (VC) of 59.3 V when subjected to its rated peak pulse current of 25.3 A (1500 W, 1 ms pulse). This value is measured per Figure 5 waveform in the ON Semiconductor datasheet and represents the upper limit of voltage seen by protected circuitry during worst-case transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Can the 1.5KE43AG be used in bidirectional protection circuits?
No - the 1.5KE43AG is a unidirectional TVS diode, designed only for reverse-biased clamping. It conducts avalanche current when reverse voltage exceeds VBR but blocks forward current beyond ~3.5 V. For bidirectional protection (e.g., AC lines or differential data buses), a pair of 1.5KE43AG devices in series-opposing configuration or a dedicated bidirectional part like 1.5KE43CA is required.
What is the thermal resistance junction-to-lead for the 1.5KE43AG?
The 1.5KE43AG has a thermal resistance of 20 °C/W from junction to lead (RJL), measured with 3/8″ lead length at TL ≤ 25°C. This parameter governs steady-state power dissipation limits (5.0 W at 75°C lead temperature) and informs heatsinking decisions when used in repetitive surge scenarios or high-ambient environments.
Is the 1.5KE43AG certified for use in medical equipment per regulatory standards?
Yes - the 1.5KE43AG carries UL 497B recognition (File #E210057, QVGQ2 category) for isolated loop circuit protection, validated for dielectric withstand, endurance conditioning, and strike voltage breakdown. This certification supports compliance in Class I and II medical devices where transient immunity and safety isolation are mandated, including patient-connected monitoring systems.
How does the temperature coefficient affect the 1.5KE43AG's breakdown voltage stability?
The 1.5KE43AG exhibits a VBR temperature coefficient of 0.101 %/°C, meaning its breakdown voltage increases by approximately 43 mV per °C rise above 25°C. This positive drift ensures clamping remains effective at elevated temperatures - unlike some Zener-based protectors - and supports reliable operation across the full −65°C to +175°C junction temperature range without derating VBR for thermal drift.
1.5KE43AG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36.8V (Max)
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE43AG FAQ
1.How can I place an order for 1.5KE43AG through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43AG 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 1.5KE43AG reliable?
The price and inventory of 1.5KE43AG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE43AG is usually 5 days.
3.What payment methods are accepted for 1.5KE43AG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43AG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43AG?
1.5KE43AG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43AG 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 1.5KE43AG?
For technical support, including 1.5KE43AG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43AG requirements.
6.How does Aetrix verify that 1.5KE43AG is sourced from the original manufacturer or authorized distributors?
All 1.5KE43AG 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 1.5KE43AG meets industry standards.
7.What is the process for return or replacement of 1.5KE43AG?
All 1.5KE43AG units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43AG, 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 1.5KE43AG part is unused and in its original packaging.
Return procedure for 1.5KE43AG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE43AG Tags
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