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Vishay General Semiconductor - Diodes Division 1.5KE43A-E3/73
- Part No.:
- 1.5KE43A-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE43A-E3/73.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:8,511
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Product details
Overview
1.5KE43A-E3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails and signal lines. It features a 43 V breakdown voltage (VBR = 40.9–45.2 V at 1.0 mA), 36.8 V maximum working voltage (VWM), 59.3 V clamping voltage (VC) at 25.3 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5KE43A-E3/73 datasheet, 1.5KE43A-E3/73 pinout, 1.5KE43A-E3/73 application, or 1.5KE43A-E3/73 equivalent, this part delivers verified clamping performance, RoHS-compliant matte tin-plated leads, JEDEC-standard 1.5KE package compatibility, and commercial-grade reliability across industrial power supplies, automotive body electronics, and telecom interface protection circuits.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when transient voltage exceeds VBR, it avalanches into low-impedance conduction, diverting surge current away from downstream components. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
It supports 10/1000 µs waveform compliance per R.E.A., exhibits 0.101 %/°C temperature coefficient of VBR, and maintains ≤1.0 µA reverse leakage at VWM. Thermal resistance is 75 °C/W (junction-to-ambient) and 15.4 °C/W (junction-to-lead), enabling reliable operation up to TJ = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 40.9 V / 45.2 V at 1.0 mA - defines precise avalanche initiation threshold for repeatable clamping onset |
| VWM | 36.8 V - maximum continuous DC or RMS operating voltage before leakage rises significantly |
| VC @ IPPM | 59.3 V at 25.3 A - clamped voltage during 1500 W surge, limiting stress on protected ICs |
| PPPM | 1500 W - peak pulse power handling with 10/1000 µs waveform, supporting IEC 61000-4-5 Level 4 immunity |
| IPPM | 25.3 A - maximum non-repetitive surge current capability under standard test conditions |
| TJ max. | 175 °C - enables use in high-temperature environments such as engine control units and industrial motor drives |
| RθJA | 75 °C/W - determines thermal derating needed for sustained power dissipation in PCB layouts without heatsinking |
Pinout & Package
Package: JEDEC-standard Case Style 1.5KE - molded epoxy body with matte tin-plated axial leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Current exit terminal during forward conduction; marked with color band | Connected to protected line (e.g., +12 V rail); avalanche occurs when cathode-to-anode voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| 1500 W peak pulse power (10/1000 µs) | Provides robust protection against severe transients including lightning surges and load dump events |
| Fast response time (~1 ns) | Clamps before sensitive ICs experience damaging overvoltage - critical for protecting modern low-voltage logic |
| Low incremental surge resistance | Minimizes VC overshoot during high-current transients, improving margin for downstream component ratings |
| RoHS-compliant E3 suffix | Meets JESD 201 Class 1A whisker resistance and global environmental compliance requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V supply lines in body control modules from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp transients above 36.8 V. Use Value: Limits clamped voltage to 59.3 V during 25.3 A surges, preserving MOSFET gate oxide integrity and MCU input stage safety. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC analog inputs against ESD and field wiring transients. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to absorb 8/20 µs and 10/1000 µs transients before reaching precision amplifier front-end. Use Value: Sub-nanosecond response prevents latch-up in op-amps and ADC drivers exposed to ±15 kV contact ESD per IEC 61000-4-2. |
| Telecom Line Interface Protection | Consumer Power Adapter Output Protection |
Use Scenario: Shielding Ethernet PHY power pins and auxiliary bias rails in PoE-powered equipment from induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary-level TVS on +3.3 V/+5 V bias rails feeding magnetics and PHY ICs. Use Value: 1500 W rating handles multiple repetitions of IEC 61000-4-5 Combination Wave (10/700 µs) without degradation. |
Use Scenario: Secondary-side overvoltage suppression on USB-C PD adapter 20 V output rails against feedback loop failure or Zener drift. IC Role / Device Role / Timing Role: Standby clamping device across output capacitor to prevent >36.8 V excursion during regulation loss. Use Value: Tight VBR tolerance (±5 %) ensures predictable activation before downstream USB-PD controller shutdown threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A | DO-214AA package; 600 W PPPM; same VBR range but lower surge capacity | Preferred for space-constrained SMT layouts; unsuitable for 1500 W surge events | Select SMBJ43A only when board area limits axial leaded devices and surge energy is ≤600 W |
| 1.5KE43CA | Bidirectional variant; identical VBR/VC specs but symmetrical clamping for AC-coupled or floating lines | Required for RS-485, CAN bus, or audio line protection where polarity reversal occurs | Choose 1.5KE43CA instead of 1.5KE43A-E3/73 only when bidirectional clamping is mandated by signal topology |
Compared with SMBJ43A and 1.5KE43CA, the 1.5KE43A-E3/73 uniquely delivers 1500 W axial-leaded surge protection with tight 40.9–45.2 V VBR tolerance - making it optimal for high-energy DC rail protection where DO-214AA thermal limits or bidirectional symmetry are not required.
Availability
1.5KE43A-E3/73 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and telecom line protection requiring stable component supply and full traceability through Vishay's commercial-grade production line.
Supply support for 1.5KE43A-E3/73 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, power handling, and AEC-Q101 qualification.
The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against lightning, load dump, and ESD is mission-critical.
FAQ
What is the breakdown voltage tolerance of the 1.5KE43A-E3/73?
The 1.5KE43A-E3/73 has a specified breakdown voltage range of 40.9 V to 45.2 V at 1.0 mA test current, representing a ±5 % tolerance around the nominal 43 V rating. This tight VBR window ensures consistent clamping behavior across production lots and supports reliable design margins in 36 V nominal systems. The 1.5KE43A-E3/73 datasheet confirms this range under standard test conditions at TA = 25 °C.
Is the 1.5KE43A-E3/73 RoHS compliant and lead-free?
Yes, the 1.5KE43A-E3/73 carries the "E3" suffix, indicating full RoHS compliance per Directive 2011/65/EU and exemption 6(c)-I. Its matte tin-plated leads meet J-STD-002 solderability standards and JESD 201 Class 1A whisker resistance testing. The 1.5KE43A-E3/73 is manufactured using lead-free materials and processes verified by Vishay's material declaration documentation.
What is the maximum clamping voltage of the 1.5KE43A-E3/73 at rated surge current?
The 1.5KE43A-E3/73 clamps to a maximum of 59.3 V when subjected to its rated peak pulse current of 25.3 A (10/1000 µs waveform). This VC value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The 1.5KE43A-E3/73 achieves this with low incremental surge resistance, minimizing overshoot beyond VC.
Can the 1.5KE43A-E3/73 be used in automotive applications?
The 1.5KE43A-E3/73 is qualified for commercial-grade automotive use (e.g., body electronics, infotainment power rails) with operating junction temperature up to 175 °C and thermal resistance optimized for lead-mounted dissipation. While not AEC-Q101 certified (that requires HE3 suffix), its construction, glass passivation, and 1500 W surge rating make it suitable for non-safety-critical automotive subsystems where full qualification is not mandated. Always verify system-level compliance separately for the 1.5KE43A-E3/73.
How does the 1.5KE43A-E3/73 differ from the bidirectional 1.5KE43CA?
The 1.5KE43A-E3/73 is unidirectional with cathode marking and conducts only in reverse avalanche mode, while the 1.5KE43CA provides symmetrical clamping for AC or floating signals. Both share identical VBR, VC, and PPPM specs, but the 1.5KE43A-E3/73 cannot protect against positive-going transients on grounded lines - a key distinction when selecting between them. Use the 1.5KE43A-E3/73 for DC rail protection and 1.5KE43CA for differential or AC-coupled interfaces.
1.5KE43A-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Active
- 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:
- 1.5KE
1.5KE43A-E3/73 FAQ
1.How can I place an order for 1.5KE43A-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43A-E3/73 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-E3/73 reliable?
The price and inventory of 1.5KE43A-E3/73 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-E3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KE43A-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43A-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43A-E3/73?
1.5KE43A-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43A-E3/73 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-E3/73?
For technical support, including 1.5KE43A-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43A-E3/73 requirements.
6.How does Aetrix verify that 1.5KE43A-E3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KE43A-E3/73 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-E3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KE43A-E3/73?
All 1.5KE43A-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43A-E3/73, 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-E3/73 part is unused and in its original packaging.
Return procedure for 1.5KE43A-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE43A-E3/73 Tags
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