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Vishay General Semiconductor - Diodes Division 1.5KE43A-E3/54
- Part No.:
- 1.5KE43A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE43A-E3/54.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:2,838
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Product details
Overview
1.5KE43A-E3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of 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 standoff voltage (VWM), 59.3 V clamping voltage (VC) at 25.3 A peak pulse current, 1500 W peak pulse power (10/1000 µs), and operates from –55 °C to +175 °C - used in automotive power supply input stages and industrial sensor interface protection.
For engineers reviewing the 1.5KE43A-E3/54 datasheet, 1.5KE43A-E3/54 pinout, 1.5KE43A-E3/54 application, or 1.5KE43A-E3/54 equivalent, this page delivers verified electrical parameters, JEDEC 1.5KE package details, clamping performance under surge conditions, thermal resistance (RθJA = 75 °C/W), and RoHS-compliant commercial-grade sourcing status - all critical for ESD/lightning transient design validation.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction to achieve sub-nanosecond response time (<1 ns) and low incremental surge resistance. Its clamping action begins at VBR ≥ 40.9 V and limits transient energy to ≤59.3 V at 25.3 A (10/1000 µs waveform), with 6.5 W steady-state power dissipation on infinite heatsink at TL = 75 °C.
It supports 200 A non-repetitive forward surge current (8.3 ms half-sine), exhibits 3.5 V max forward voltage at 100 A, and maintains stable VBR temperature coefficient of +0.101 %/°C - enabling predictable behavior across automotive and industrial ambient temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 40.9 V / 45.2 V at 1.0 mA - defines precise voltage threshold where clamping initiates under controlled test conditions |
| VWM | 36.8 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 59.3 V at 25.3 A - peak clamped voltage during 10/1000 µs surge, directly limiting downstream IC stress |
| PPPM | 1500 W - peak transient power handling capacity, enabling robust protection against lightning-induced surges |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance, informing heatsink requirements for sustained power dissipation |
| TJ max. | +175 °C - maximum junction temperature, supporting operation in under-hood automotive environments |
| IFSM | 200 A - non-repetitive forward surge rating (8.3 ms half-sine), validating survivability in high-energy inductive switch-off events |
Pinout & Package
1.5KE43A-E3/54 is housed in the industry-standard axial-leaded Case Style 1.5KE package (JEDEC DO-201AD), with cathode indicated by a color band on the body. Leads are matte tin-plated and solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected circuit; conducts during positive transients when cathode is biased higher |
| Cathode | Clamping reference terminal | Marked end; connected to higher-potential rail (e.g., VIN); initiates avalanche breakdown when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| 1500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-earth) without derating in typical PCB layouts |
| Sub-nanosecond response time | Clamps transients before sensitive ICs experience damaging overvoltage - critical for protecting CAN/LIN bus transceivers |
| RoHS-compliant, commercial grade (E3 suffix) | Meets JESD 201 Class 1A whisker test and UL 94 V-0 flammability standard for epoxy molding compound |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in MOSFETs and microcontrollers |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load-dump and jump-start transients per ISO 7637-2. IC Role / Device Role / Timing Role: Primary shunt clamping device placed between power rail and ground, responding within <1 ns to limit voltage to ≤59.3 V. Use Value: Prevents permanent damage to voltage regulators and microcontrollers during 120 V/200 ms load-dump events. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA loops) and digital sensor interfaces (I²C, SPI) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional transient suppressor mounted at connector entry point, clamping induced surges before reaching precision ADC inputs. Use Value: Maintains signal integrity and avoids system resets caused by ±8 kV contact ESD per IEC 61000-4-2. |
| Telecom DC Power Feeds | Consumer Equipment AC/DC Adapter Inputs |
Use Scenario: Overvoltage protection on -48 V telecom power distribution boards exposed to lightning-induced surges on long-line feeds. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 36.8 V) placed across -48 V rail and return, conducting only during >40.9 V transients. Use Value: Survives 1500 W 10/1000 µs surges while maintaining <1 µA leakage at nominal -48 V operation. |
Use Scenario: Secondary-side DC output protection in wall adapters for USB-C PD and smart home hubs. IC Role / Device Role / Timing Role: Clamp element on regulated 5 V/9 V/12 V outputs, absorbing coupling noise from primary-side switching transients. Use Value: Eliminates need for additional filtering components by suppressing fast-rising spikes (<10 ns rise time) before they reach connected devices. |
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 (SMB) package; 43 V VBR; 64.5 V VC @ 23.3 A; 600 W PPPM | Lower peak power rating and higher clamping voltage - suitable for space-constrained PCBs but not for full ISO 7637-2 compliance | Select SMBJ43A only when board area is critical and surge energy is limited to ≤600 W; verify layout thermal relief for 6.5 W steady-state dissipation. |
| 1.5KE43CA | Bidirectional variant; same VBR, VC, and PPPM; symmetric clamping for AC-coupled or floating lines | Required for differential signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs; not usable on DC rails with defined ground reference | Choose 1.5KE43CA exclusively for bidirectional protection needs; 1.5KE43A-E3/54 remains optimal for unidirectional DC power rails. |
Compared with SMBJ43A, 1.5KE43A-E3/54 delivers 2.5× higher surge power headroom and tighter clamping, while 1.5KE43CA offers identical transient performance with polarity-agnostic operation - making the original part the preferred choice for cost-sensitive, high-energy DC protection where unidirectional operation suffices.
Availability
1.5KE43A-E3/54 is available at Aetrix Electronics and suitable for automotive ECU power inputs, industrial sensor interface circuits, and telecom DC distribution systems requiring stable component supply, consistent parametric performance, and RoHS-compliant manufacturing traceability.
Supply support for 1.5KE43A-E3/54 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 1.5KE series was engineered specifically for high-energy transient suppression in harsh-environment applications, balancing rugged axial packaging with precise VBR tolerance and repeatable clamping performance across temperature.
FAQ
What is the breakdown voltage range of the 1.5KE43A-E3/54?
The 1.5KE43A-E3/54 has a guaranteed breakdown voltage (VBR) range of 40.9 V to 45.2 V at a test current of 1.0 mA, measured per JEDEC standards. This tight tolerance ensures predictable clamping onset across production lots and supports reliable design margining in 36–48 V system protection schemes. The 1.5KE43A-E3/54 achieves this specification using a glass-passivated silicon junction optimized for stability under thermal cycling.
How does the 1.5KE43A-E3/54 differ from bidirectional TVS diodes like 1.5KE43CA?
The 1.5KE43A-E3/54 is unidirectional and functions only as a reverse-biased clamp - it conducts during negative transients relative to its cathode. In contrast, 1.5KE43CA provides symmetrical clamping in both directions, making it suitable for AC signals or floating lines. The 1.5KE43A-E3/54's anode must be tied to ground or the lowest potential node, whereas 1.5KE43CA has no polarity marking and can be placed across any two nodes regardless of DC bias direction.
What is the maximum clamping voltage of the 1.5KE43A-E3/54 under surge conditions?
The 1.5KE43A-E3/54 clamps to a maximum of 59.3 V when subjected to its rated 25.3 A peak pulse current (10/1000 µs waveform). This value is measured across the device terminals during standardized surge testing and represents the worst-case voltage seen by downstream components. Designers use this parameter to verify that protected ICs remain within their absolute maximum ratings during transient events - the 1.5KE43A-E3/54 achieves this with a clamping ratio of approximately 1.36.
Is the 1.5KE43A-E3/54 qualified to AEC-Q101 for automotive use?
No - the 1.5KE43A-E3/54 carries the E3 suffix, indicating RoHS-compliant commercial-grade qualification only. For AEC-Q101 qualification, the part number must include the HE3 suffix (e.g., 1.5KE43AHE3_B). The 1.5KE43A-E3/54 meets all electrical and mechanical specifications for automotive environments (e.g., TJ max = +175 °C), but lacks the extended reliability testing required for formal AEC-Q101 certification. Always verify qualification status via Vishay's official documentation before deployment in safety-critical automotive systems.
What package type and lead finish does the 1.5KE43A-E3/54 use?
The 1.5KE43A-E3/54 uses the axial-leaded JEDEC DO-201AD package (Case Style 1.5KE), with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. The E3 suffix confirms RoHS compliance and JESD 201 Class 1A whisker resistance. Lead diameter is 0.038–0.042 inches (0.96–1.07 mm), and body length is 0.210–0.285 inches (5.3–7.2 mm), enabling compatibility with standard through-hole assembly processes and automated tape-and-reel feeding (13" reel, 1400 pcs).
1.5KE43A-E3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- 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-E3/54 FAQ
1.How can I place an order for 1.5KE43A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43A-E3/54 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-E3/54 reliable?
The price and inventory of 1.5KE43A-E3/54 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-E3/54 is usually 5 days.
3.What payment methods are accepted for 1.5KE43A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43A-E3/54?
1.5KE43A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43A-E3/54 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-E3/54?
For technical support, including 1.5KE43A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43A-E3/54 requirements.
6.How does Aetrix verify that 1.5KE43A-E3/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KE43A-E3/54 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-E3/54 meets industry standards.
7.What is the process for return or replacement of 1.5KE43A-E3/54?
All 1.5KE43A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43A-E3/54, 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-E3/54 part is unused and in its original packaging.
Return procedure for 1.5KE43A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE43A-E3/54 Tags
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