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Diodes Incorporated 1.5KE43A-T
- Part No.:
- 1.5KE43A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE43A-T.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:8,204
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Product details
Overview
1.5KE43A-T from Diodes Incorporated is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 axial package, designed for primary overvoltage protection of DC power rails and signal lines. It features a 36.8V reverse standoff voltage, 40.9V minimum breakdown voltage at 1mA, 59.3V maximum clamping voltage at 25.3A peak pulse current, and operates across -55°C to +175°C.
For engineers reviewing the 1.5KE43A-T datasheet, 1.5KE43A-T pinout, 1.5KE43A-T application, or 1.5KE43A-T equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, peak pulse current capability under IEC 61000-4-5 surge waveforms, thermal derating above +25°C, and compatibility with automated through-hole assembly due to axial lead form.
Technical Context
This unidirectional TVS diode uses glass-passivated silicon junction technology to achieve fast response time (<1ps) and stable clamping performance under repetitive 1.0ms 8/20μs surge transients. Its DO-201 package enables high thermal mass for 1500W non-repetitive pulse dissipation while maintaining low junction-to-lead thermal resistance.
The device exhibits a 0.101%/°C voltage temperature coefficient and 5.0μA max reverse leakage at 36.8V, supporting reliable operation in automotive and industrial environments where ambient temperatures exceed 85°C and long-term stability is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500W at 1.0ms pulse - sustains IEC 61000-4-5 Level 4 surges without degradation |
| Reverse Standoff Voltage | 36.8V - maximum continuous DC voltage before significant leakage begins |
| Breakdown Voltage | 40.9V min @ 1mA - ensures reliable triggering above system operating voltage |
| Clamping Voltage | 59.3V max @ 25.3A - limits transient voltage seen by downstream circuitry |
| Operating Temperature | -55°C to +175°C - supports under-hood automotive and industrial control applications |
| Leakage Current | 5.0μA max @ 36.8V - minimizes standby power loss in battery-powered systems |
Pinout & Package
DO-201 axial-leaded package with cathode band marking; leads are tin-finished, solderable per MIL-STD-202 Method 208, and rated for 200A peak forward surge current.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential rail during transient clamp event |
| Cathode | High-side connection point | Connected to protected line; cathode band identifies polarity for unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Ensures stable electrical parameters and long-term reliability under humidity and thermal cycling |
| RoHS-compliant, halogen-free "Green" finish | Meets EU Directive 2015/863/EU with <900ppm Br, <900ppm Cl, <1000ppm Sb |
| 1.12g package weight | Enables consistent feed accuracy in axial tape-and-reel automated insertion equipment |
| UL 94V-0 epoxy molding compound | Provides flame-retardant housing suitable for safety-critical power supply designs |
Applications
| Automotive Power Supply Protection | Industrial PLC I/O Module |
|---|---|
Use Scenario: 12V battery rail protection against load dump and alternator transients in engine control units. IC Role / Device Role / Timing Role: Primary clamping device placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤59.3V, preventing damage to 40V-rated input MOSFETs and gate drivers. |
Use Scenario: Protection of 24V digital input channels against field-wiring induced surges in factory automation controllers. IC Role / Device Role / Timing Role: Front-end transient suppressor on each isolated input channel prior to optocoupler interface. Use Value: Withstands repeated 1kV/40Ω IEC 61000-4-5 surges while maintaining <5μA leakage at 24V nominal. |
| Telecom Power Feeds | Medical Equipment DC Rails |
Use Scenario: Overvoltage suppression on -48V telecom power distribution boards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground on negative supply rail. Use Value: Clamps negative-going transients to -59.3V, protecting -48V tolerant PMICs and monitoring ICs. |
Use Scenario: Protection of isolated 5V/3.3V auxiliary supplies in diagnostic imaging systems subject to ESD and EFT events. IC Role / Device Role / Timing Role: Secondary-level TVS on regulated output rails feeding sensitive analog front-ends. Use Value: Delivers 1500W pulse handling with 0.101%/°C VBR drift, ensuring stable clamping across operating temperature range. |
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; 600W rating; 60.5V clamping at 10A | Lower power handling; requires PCB layout space optimization instead of axial lead routing | Select when board space is constrained and surge requirements are ≤600W |
| 1N6277A | Same DO-201 package; identical 1500W rating but 43V nominal; 59.0V clamping at 25.5A | Nearly identical electrical specs; different manufacturer's test conditions and traceability documentation | Use when Diodes' 1.5KE43A-T supply chain continuity is unavailable |
Compared with SMBJ43A and 1N6277A, the 1.5KE43A-T offers superior surge energy absorption in axial through-hole format, higher clamping consistency at full 25.3A, and AEC-Q200-aligned manufacturing-making it preferred for high-reliability automotive and industrial power entry designs.
Availability
1.5KE43A-T is available at Aetrix Electronics and suitable for automotive power supply protection, industrial PLC I/O modules, telecom power feeds, and medical equipment DC rails requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1.5KE43A-T 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the U.S., and manufacturing in IATF 16949-certified facilities.
The 1.5KE series belongs to Diodes' high-power TVS portfolio engineered specifically for robust overvoltage protection in automotive, industrial, and telecom infrastructure applications where reliability under extreme surge conditions is mandatory.
FAQ
What is the difference between 1.5KE43A-T and 1.5KE43CA-T?
The 1.5KE43A-T is unidirectional with cathode-band marking and clamps only positive transients relative to ground; the 1.5KE43CA-T is bidirectional, lacks the cathode band, and clamps both polarities symmetrically. Their breakdown voltages differ slightly: 40.9V min (A) vs. 40.9V min (CA), but clamping behavior and package are otherwise identical.
Can 1.5KE43A-T be used in surface-mount designs?
No - the 1.5KE43A-T uses a DO-201 axial-leaded package intended for through-hole mounting. For surface-mount equivalents, consider SMBJ43A (600W) or SMCJ43A (1500W in SMC package); these share similar voltage ratings but differ in thermal performance and PCB footprint requirements.
What is the maximum allowable derated power at 75°C ambient?
At 75°C ambient, the steady-state power dissipation is rated at 5.0W with 9.5mm lead length. Derating follows a linear curve: above +25°C, power decreases by approximately 40mW/°C, yielding ~3.0W usable dissipation at +75°C for continuous operation.
Is 1.5KE43A-T qualified to AEC-Q200?
While not explicitly listed as AEC-Q200 qualified in public documentation, the 1.5KE43A-T is manufactured in IATF 16949-certified facilities and supports automotive change control processes. Diodes states that AEC-Q200 qualification is available upon request for specific part numbers - contact Diodes or Aetrix for PPAP-ready documentation.
1.5KE43A-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE43A-T FAQ
1.How can I place an order for 1.5KE43A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43A-T 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-T reliable?
The price and inventory of 1.5KE43A-T 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-T is usually 5 days.
3.What payment methods are accepted for 1.5KE43A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43A-T?
1.5KE43A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43A-T 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-T?
For technical support, including 1.5KE43A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43A-T requirements.
6.How does Aetrix verify that 1.5KE43A-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE43A-T 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-T meets industry standards.
7.What is the process for return or replacement of 1.5KE43A-T?
All 1.5KE43A-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43A-T, 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-T part is unused and in its original packaging.
Return procedure for 1.5KE43A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE43A-T Tags
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ESD9B5.0ST5G
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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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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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