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Vishay General Semiconductor - Diodes Division 1.5KA18AHE3/73
- Part No.:
- 1.5KA18AHE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA18AHE3/73.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:2,488
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Product details
Overview
1.5KA18AHE3/73 from Vishay General Semiconductor is an automotive-grade unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in harsh environments. It features a 1500 W peak pulse power rating (10/1000 µs), 17.1–18.9 V breakdown voltage (VBR), 15.3 V stand-off voltage (VWM), and AEC-Q101 qualification for under-hood automotive electronics.
For engineers reviewing the 1.5KA18AHE3/73 datasheet, 1.5KA18AHE3/73 pinout, 1.5KA18AHE3/73 application, or 1.5KA18AHE3/73 equivalent, key selection criteria include clamping voltage (25.2 V at 59.5 A), junction temperature range (–65 °C to +185 °C), RoHS-compliant HE3 packaging, and JESD201 Class 2 whisker resistance.
Technical Context
This TVS diode employs Vishay's patented PAR® construction for stable clamping under repetitive surge stress and high-temperature operation up to 185 °C. Its unidirectional polarity and low incremental surge resistance ensure rapid response (<1 ns) and minimal voltage overshoot during transients induced by inductive load switching.
The device is optimized for automotive power line and signal line protection, with a 10/1000 µs waveform compliance per ANSI/IEEE C62.35 and derating curves validated for lead temperature (TL) up to 75 °C and junction temperature (TJ) up to 185 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V - Ensures reliable triggering above system operating voltage while avoiding false clamping |
| VWM | 15.3 V - Maximum continuous reverse voltage before leakage exceeds 1 µA at 25 °C |
| VC @ IPPM | 25.2 V at 59.5 A - Clamped voltage during 1500 W surge protects downstream MOSFETs and ICs |
| PPPM | 1500 W (10/1000 µs) - Withstands automotive load-dump and ISO 7637-2 Pulse 5a surges |
| TJ max. | +185 °C - Enables placement near high-temperature engine control units without thermal derating loss |
| IFSM | 200 A (8.3 ms half-sine) - Survives repeated motor commutation and alternator field collapse events |
| Package | Case Style 1.5KA - Axial-leaded, molded epoxy body meeting UL 94 V-0 flammability rating |
Pinout & Package
Case Style 1.5KA is an axial-leaded package with cathode indicated by a color band. Leads are matte tin-plated and solderable per J-STD-002 and JESD22-B102. The HE3 suffix denotes RoHS compliance, AEC-Q101 qualification, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return plane to complete clamping loop during transients |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 12 V battery rail); color band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables stable VBR and low dynamic impedance across 1000+ surge cycles at 125 °C |
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock |
| 1500 W peak pulse power | Meets ISO 7637-2 Pulse 5a (load dump) requirements for 12 V systems without external heat sinking |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage stress on protected devices-critical for 24 V tolerant logic and CAN transceivers |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth in high-reliability automotive modules over 15+ year service life |
Applications
| Automotive Engine Control Unit (ECU) Power Input | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects ECU 12 V supply against load-dump transients (ISO 7637-2 Pulse 5a) and alternator field collapse. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges before they reach DC/DC converters and microcontrollers. Use Value: Clamps to 25.2 V at 59.5 A, limiting stress on downstream 36 V-rated regulators and ensuring ASIL-B functional safety compliance. | Use Scenario: Shields 24 V digital input channels of programmable logic controllers from inductive kickback from solenoid valves and contactors. IC Role / Device Role / Timing Role: Standoff voltage (15.3 V) allows normal 24 V logic detection while clamping >30 V transients within nanoseconds. Use Value: 185 °C max junction temperature enables direct mounting on DIN-rail enclosures exposed to ambient temperatures up to 85 °C. |
| Automotive Body Control Module (BCM) LIN Bus Line | Telecom Power Supply Input Stage |
Use Scenario: Safeguards LIN transceiver pins against ESD and cable discharge events in door module wiring harnesses. IC Role / Device Role / Timing Role: Low capacitance (typ. <100 pF at VWM) avoids signal integrity degradation on 20 kbps LIN bus lines. Use Value: Fast response time (<1 ns) and 25.2 V clamping prevent latch-up in LIN PHY ICs during ISO 10605 ESD strikes. | Use Scenario: Front-end protection for AC/DC power supplies in telecom base stations subjected to lightning-induced surges on -48 V DC distribution rails. IC Role / Device Role / Timing Role: Mounted upstream of bulk capacitors and active OR-ing FETs to absorb energy before it reaches primary-side controllers. Use Value: 1500 W rating and 200 A IFSM withstand repeated 10/1000 µs surges per ITU-T K.20/21 without parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Lower peak pulse power (600 W), SMC package (surface-mount), 17.1–18.9 V VBR, 15.3 V VWM | Not AEC-Q101 qualified; intended for commercial/industrial PCB space-constrained designs | Select when board-level surge immunity suffices and automotive qualification is not required |
| 1.5KE18A | Same 1500 W rating and VBR range, but standard reliability grade (not AEC-Q101), no HE3 whisker testing | Lacks automotive qualification and high-temp reliability validation; used in non-critical industrial power supplies | Select only for cost-sensitive non-automotive applications where 185 °C operation is not needed |
Compared with SMBJ18A and 1.5KE18A, the 1.5KA18AHE3/73 uniquely combines AEC-Q101 qualification, 185 °C junction rating, JESD201 Class 2 whisker resistance, and axial-leaded robustness for high-vibration automotive environments-making it irreplaceable for under-hood ECU and BCM deployments.
Availability
1.5KA18AHE3/73 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and telecom power supply input stages requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1.5KA18AHE3/73 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, TVS devices, and optoelectronics with emphasis on reliability, power handling, and automotive qualification.
The 1.5KA series was engineered specifically for automotive transient suppression-delivering high-temperature stability, AEC-Q101 compliance, and robust PAR® construction to meet stringent ISO 7637-2 and ISO 16750-2 requirements.
FAQ
What is the maximum clamping voltage of the 1.5KA18AHE3/73 under full-rated surge current?
The 1.5KA18AHE3/73 has a maximum clamping voltage (VC) of 25.2 V when subjected to its rated peak pulse current (IPPM) of 59.5 A using a 10/1000 µs waveform. This value is measured at TA = 25 °C and ensures protected circuitry remains below critical overvoltage thresholds during standardized automotive surge events such as ISO 7637-2 Pulse 5a.
Is the 1.5KA18AHE3/73 qualified for automotive applications?
Yes, the 1.5KA18AHE3/73 is AEC-Q101 qualified and designated as an automotive-grade part (base P/NHE3). It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and mechanical shock-to ensure reliability in under-hood environments up to 185 °C junction temperature.
What does the HE3 suffix indicate on the 1.5KA18AHE3/73?
The HE3 suffix on the 1.5KA18AHE3/73 indicates RoHS compliance, high-reliability/automotive grade qualification (AEC-Q101), and conformance to JESD201 Class 2 whisker resistance requirements. It also confirms matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards.
Can the 1.5KA18AHE3/73 be used in bidirectional configurations?
No, the 1.5KA18AHE3/73 is unidirectional only, as explicitly stated in the Vishay datasheet. Its internal structure and polarity marking (cathode band) support protection of positive-going transients on grounded systems. For bidirectional protection, a separate pair or a dedicated bidirectional TVS such as SMAJ18CA must be used.
What is the standoff voltage (VWM) and why is it important for the 1.5KA18AHE3/73?
The standoff voltage (VWM) of the 1.5KA18AHE3/73 is 15.3 V. This is the maximum continuous reverse voltage the device can block without exceeding 1 µA leakage current at 25 °C. It ensures the TVS remains inactive during normal 12 V automotive operation while reliably triggering above this threshold during surge events-preventing false trips and power loss.
1.5KA18AHE3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- PAR®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 59.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KA
1.5KA18AHE3/73 FAQ
1.How can I place an order for 1.5KA18AHE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA18AHE3/73 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 1.5KA18AHE3/73 reliable?
The price and inventory of 1.5KA18AHE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA18AHE3/73 is usually 5 days.
3.What payment methods are accepted for 1.5KA18AHE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA18AHE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA18AHE3/73?
1.5KA18AHE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA18AHE3/73 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 1.5KA18AHE3/73?
For technical support, including 1.5KA18AHE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA18AHE3/73 requirements.
6.How does Aetrix verify that 1.5KA18AHE3/73 is sourced from the original manufacturer or authorized distributors?
All 1.5KA18AHE3/73 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 1.5KA18AHE3/73 meets industry standards.
7.What is the process for return or replacement of 1.5KA18AHE3/73?
All 1.5KA18AHE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA18AHE3/73, 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 1.5KA18AHE3/73 part is unused and in its original packaging.
Return procedure for 1.5KA18AHE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA18AHE3/73 Tags
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