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Vishay General Semiconductor - Diodes Division 1.5KE43-E3/73
- Part No.:
- 1.5KE43-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE43-E3/73.pdf
- Description:
- TVS DIODE 34.8VWM 61.9VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:9,693
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Product details
Overview
1.5KE43-E3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 43 V breakdown voltage (VBR = 40.9–45.2 V at 1 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 1.5KE43-E3/73 datasheet, 1.5KE43-E3/73 pinout, 1.5KE43-E3/73 application, or 1.5KE43-E3/73 equivalent, this part delivers verified transient suppression performance in automotive, industrial, and telecom power supply inputs where fast response (<1 ns), low clamping ratio (VC/VWM ≈ 1.61), and AEC-Q101-qualified variants are critical selection criteria.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches into low-impedance conduction, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM).
It is rated for 1500 W peak pulse power under 10/1000 µs waveform, supports 200 A non-repetitive forward surge current (8.3 ms half-sine), and maintains operation across –55 °C to +175 °C junction temperature range - enabling use in high-reliability environments without thermal derating below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 40.9 V / 45.2 V at 1 mA - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| VWM | 36.8 V - maximum continuous reverse operating voltage; must exceed system nominal rail by ≥10 % to avoid leakage-induced stress |
| VC @ IPPM | 59.3 V at 25.3 A - clamping voltage during 10/1000 µs surge; determines maximum stress imposed on protected ICs |
| PPPM | 1500 W - peak pulse power handling capability; enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) |
| IPPM | 25.3 A - peak pulse current capacity; sets minimum PCB trace width and fuse coordination requirements |
| TJ max. | +175 °C - extended junction temperature rating allows placement near hot components without derating |
| RθJA | 75 °C/W - thermal resistance from junction to ambient; informs heatsinking necessity for repetitive surge duty |
Pinout & Package
Package: DO-201AD (Case Style 1.5KE), axial-leaded molded epoxy body with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102 solderability standards. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (low-side connection) | Connected to ground or lower-potential node; carries full surge current during clamping |
| Cathode | Reverse-biased avalanche terminal (high-side connection) | Connected to protected line; avalanche initiates here when VAK > VBR; marked with color band |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance (±5 %), low leakage (<1 µA), and long-term reliability under thermal cycling |
| 1500 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 surge immunity up to 4 kV open-circuit voltage with 2 Ω source impedance |
| Clamping ratio VC/VWM = 1.61 | Minimizes overvoltage overshoot during transient events, reducing risk of latch-up or gate oxide damage in protected MOSFETs |
| Response time < 1 ns | Enables protection of high-speed digital interfaces (e.g., CAN, RS-485) before transient energy couples into sensitive nodes |
| AEC-Q101 qualified variants available | Validated for automotive powertrain and body electronics applications requiring zero defect rates and extended temperature operation |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 12 V/24 V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role: Primary shunt clamp on main power rail upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤59.3 V, preventing damage to 3.3 V/5 V logic supplies and ensuring ASIL-B functional safety compliance. |
Use Scenario: 24 V digital input modules receiving signals from field sensors in factory automation. IC Role / Device Role: Front-end protection for optocoupler or Schmitt-trigger input stages against ESD and inductive kickback. Use Value: Clamps 2 kV EFT bursts (IEC 61000-4-4) within 1 ns, preserving signal integrity and eliminating false triggering. |
| Telecom AC-DC Adapter Output | Consumer Appliance Motor Drive Supply |
Use Scenario: Secondary-side 48 V output of PoE-powered network switches subjected to lightning-induced surges. IC Role / Device Role: Final-stage overvoltage limiter before Ethernet PHY and PMIC inputs. Use Value: Absorbs 1500 W surge energy without degradation, maintaining <1 µA leakage at 36.8 V to avoid standby power penalty. |
Use Scenario: 310 V DC bus in BLDC motor inverters experiencing regenerative voltage spikes during braking. IC Role / Device Role: Snubber-connected TVS across bus capacitors to suppress dv/dt-induced gate driver faults. Use Value: Withstands 200 A 8.3 ms forward surge, enabling single-device protection without parallel stacking or thermal runaway risk. |
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 | DO-214AA package; lower PPPM = 600 W; VC = 69.4 V at 8.6 A; smaller footprint but reduced surge margin | Better suited for space-constrained PCBs with moderate surge exposure (IEC 61000-4-5 Level 2) | Select SMBJ43A only if board area is critical and peak surge current remains below 10 A; verify thermal relief for repeated events. |
| 1.5KE43AHE3_B | Same DO-201AD package and electrical specs; AEC-Q101 qualified; RoHS-compliant with JESD 201 Class 2 whisker resistance | Required for automotive production programs needing PPAP documentation and zero-defect reliability validation | Choose 1.5KE43AHE3_B for Tier 1 automotive designs; standard 1.5KE43-E3/73 suffices for industrial/commercial use. |
Compared with SMBJ43A, 1.5KE43-E3/73 provides 2.5× higher surge power margin and tighter clamping, while 1.5KE43AHE3_B adds automotive qualification without altering electrical behavior - making the base 1.5KE43-E3/73 optimal for cost-sensitive, non-automotive high-energy protection.
Availability
1.5KE43-E3/73 is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O modules, telecom power adapters, and consumer appliance motor drives requiring stable component supply and consistent surge performance across production batches.
Supply support for 1.5KE43-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 high-reliability diodes, rectifiers, and protection devices with broad automotive and industrial certifications.
The 1.5KE series was engineered specifically for high-energy transient suppression in harsh environments, emphasizing rugged packaging, stable breakdown, and repeatable clamping performance across temperature and lifetime.
FAQ
What is the breakdown voltage tolerance for 1.5KE43-E3/73?
The 1.5KE43-E3/73 has a guaranteed breakdown voltage range of 40.9 V to 45.2 V at 1 mA test current, corresponding to a ±5 % tolerance per the Vishay 88301 datasheet. This tight VBR window ensures predictable clamping onset and compatibility with 36 V nominal systems where margin above VWM = 36.8 V is essential. The 1.5KE43-E3/73 achieves this via precision diffusion and glass passivation control during manufacturing.
Is 1.5KE43-E3/73 suitable for bidirectional signal line protection?
No - the 1.5KE43-E3/73 is a unidirectional TVS diode, intended for DC rail protection where polarity is fixed. For bidirectional signal lines (e.g., RS-485, CAN), the bidirectional variant 1.5KE43CA must be used instead. The 1.5KE43-E3/73 lacks symmetrical clamping in both directions and will conduct forward current if reverse-connected, potentially damaging the circuit. Always verify polarity marking (cathode band) during placement of the 1.5KE43-E3/73.
What is the maximum clamping voltage of 1.5KE43-E3/73 under surge conditions?
The 1.5KE43-E3/73 clamps to a maximum of 59.3 V when subjected to its rated 25.3 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and represents the worst-case voltage seen by downstream components during a full-rated surge event. Designers must ensure that all protected ICs have absolute maximum ratings exceeding 59.3 V to prevent damage - a key specification confirmed in the 1.5KE43-E3/73 datasheet Table 1.
Does 1.5KE43-E3/73 meet automotive qualification standards?
The base 1.5KE43-E3/73 is commercial-grade and not AEC-Q101 qualified. However, Vishay offers the functionally identical 1.5KE43AHE3_B variant, which carries full AEC-Q101 qualification for automotive applications. Both share identical electrical parameters and DO-201AD packaging, but only the HE3_B suffix indicates automotive-grade process control, testing, and traceability. For non-automotive use, the 1.5KE43-E3/73 remains fully suitable and cost-optimized.
How does thermal resistance affect 1.5KE43-E3/73 performance in high-temperature environments?
The 1.5KE43-E3/73 has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W, meaning its junction temperature rises 75 °C above ambient per watt of steady-state power dissipation. While designed for transient (not continuous) operation, repeated surges or elevated ambient temperatures (>85 °C) require verification of thermal derating per Figure 2 in the datasheet. At 125 °C ambient, the 1.5KE43-E3/73 retains ~60 % of its 1500 W surge rating - a critical design constraint for under-hood automotive or enclosed industrial enclosures.
1.5KE43-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 34.8V
- Voltage - Breakdown (Min):
- 38.7V
- Voltage - Clamping (Max) @ Ipp:
- 61.9V
- Current - Peak Pulse (10/1000µs):
- 24.2A
- 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
1.5KE43-E3/73 FAQ
1.How can I place an order for 1.5KE43-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE43-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 1.5KE43-E3/73 reliable?
The price and inventory of 1.5KE43-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 1.5KE43-E3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KE43-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE43-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE43-E3/73?
1.5KE43-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE43-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 1.5KE43-E3/73?
For technical support, including 1.5KE43-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE43-E3/73 requirements.
6.How does Aetrix verify that 1.5KE43-E3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KE43-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 1.5KE43-E3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KE43-E3/73?
All 1.5KE43-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE43-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 1.5KE43-E3/73 part is unused and in its original packaging.
Return procedure for 1.5KE43-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE43-E3/73 Tags
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