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Vishay General Semiconductor - Diodes Division 1.5KA18AHE3/51
- Part No.:
- 1.5KA18AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA18AHE3/51.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:6,653
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Product details
Overview
1.5KA18AHE3/51 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode designed for high-energy surge protection in power rails and signal lines. 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 1.5KA18AHE3/51 datasheet, 1.5KA18AHE3/51 pinout, 1.5KA18AHE3/51 application, or 1.5KA18AHE3/51 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 low incremental surge resistance for robust ESD and load-dump immunity.
Technical Context
This TVS diode employs Vishay's patented PAR® construction for stable clamping under repetitive surge stress and operates exclusively in unidirectional polarity with a color-banded cathode. Its 10/1000 µs waveform response delivers 59.5 A peak pulse current (IPPM) while maintaining 25.2 V maximum clamping voltage (VC).
Designed for high-reliability automotive environments, it supports soldering per J-STD-002 and JESD22-B102, passes JESD201 Class 2 whisker testing, and sustains operation up to +185 °C junction temperature - critical for engine control units and ADAS sensor interfaces exposed to thermal cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - withstands ISO 7637-2 Load Dump pulses without failure |
| Breakdown Voltage VBR | 17.1–18.9 V at 1 mA - ensures reliable triggering above system nominal voltage |
| Stand-off Voltage VWM | 15.3 V - blocks normal 12 V automotive rail transients without leakage |
| Clamping Voltage VC | 25.2 V at 59.5 A - limits downstream IC voltage stress during surge events |
| Junction Temperature Range | –65 °C to +185 °C - qualified for under-hood placement in engine management systems |
| AEC-Q101 Qualification | Automotive-grade reliability - validated for lifetime operation in harsh thermal/vibration environments |
| RoHS & Whisker Compliance | HE3 suffix meets RoHS 2002/95/EC and JESD201 Class 2 - suitable for lead-free assembly |
Pinout & Package
Case Style 1.5KA: axial-leaded DO-201AD package with matte tin-plated leads; molded epoxy body rated UL 94 V-0; cathode denoted by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected circuit ground or low-side return path |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., 12 V rail or CAN bus); marked by color band |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables stable VBR and low dynamic impedance across 1000+ surge cycles |
| 1500 W peak pulse power (10/1000 µs) | Meets ISO 7637-2 Pulse 5a/b for 24 V commercial vehicle load dump immunity |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage stress on downstream MOSFETs and microcontrollers |
| AEC-Q101 qualification | Validated for automotive powertrain and chassis applications per stress test requirements |
| Matte tin plating & JESD201 Class 2 | Prevents tin whisker growth in high-humidity, high-temperature under-hood conditions |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus Line |
|---|---|
Use Scenario: Protects 12 V supply input of gasoline/diesel ECUs against alternator load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamps transients >25 V while remaining non-conductive below 15.3 V. Use Value: Prevents latch-up or permanent damage to MCU power regulators and CAN transceivers during ISO 7637-2 Pulse 5 events. |
Use Scenario: Shields LIN physical layer transceivers from battery feed transients and ESD coupling in door modules. IC Role / Device Role / Timing Role: Fast-response clamping element placed between LIN line and ground, with <1 ns response time. Use Value: Maintains LIN signal integrity (≤20 kbps) by limiting line voltage to ≤25.2 V during 100 A surges. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Stage |
Use Scenario: Safeguards 12 V bias rail of CMOS image sensors and ISP processors in front/rear-view cameras. IC Role / Device Role / Timing Role: Primary overvoltage clamp on camera module power input, operating up to +105 °C ambient. Use Value: Ensures uninterrupted video output during repeated ignition cycling and jump-start transients. |
Use Scenario: Protects gate drivers and H-bridge MOSFETs from inductive kickback during EPS motor commutation. IC Role / Device Role / Timing Role: High-surge-capacity TVS placed across motor supply rail and chassis ground. Use Value: Absorbs >1500 W energy without degradation, preserving MOSFET RDS(on) stability over 10-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18AHE3/52 | Lower peak pulse power (600 W), smaller SMB package (3.5 × 4.6 mm), same VBR range (17.1–18.9 V) | Targeted at space-constrained PCBs where 1500 W rating is not required (e.g., infotainment USB ports) | Select when board area is constrained and surge threat level is limited to IEC 61000-4-5 Level 3 |
| 1.5KE18A | Same 1500 W rating but non-automotive grade; no AEC-Q101 qualification; higher leakage at 150 °C | Acceptable for industrial/commercial power supplies but not certified for automotive safety-critical systems | Choose only for cost-sensitive non-automotive designs where long-term high-temperature reliability is secondary |
Compared with 1.5KA18AHE3/51, SMBJ18AHE3/52 trades surge capacity for footprint reduction, while 1.5KE18A sacrifices automotive qualification and high-temperature leakage performance for lower unit cost - making 1.5KA18AHE3/51 the sole choice for AEC-Q101–mandated under-hood applications requiring full 1500 W immunity.
Availability
1.5KA18AHE3/51 is available at Aetrix Electronics and suitable for automotive powertrain control, ADAS camera modules, and electric power steering systems requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot-level documentation.
Supply support for 1.5KA18AHE3/51 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 for demanding industrial and automotive applications.
The 1.5KA series was engineered specifically for automotive transient suppression, emphasizing AEC-Q101 qualification, high-temperature stability up to +185 °C, and robust PAR® construction for repeatable clamping performance in engine bay environments.
FAQ
What is the clamping voltage of the 1.5KA18AHE3/51 at its rated peak pulse current?
The 1.5KA18AHE3/51 has a maximum clamping voltage (VC) of 25.2 V at its rated peak pulse current of 59.5 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and ensures downstream components see no more than 25.2 V during worst-case surge events - critical for protecting 24 V-rated automotive ICs and MOSFETs.
Is the 1.5KA18AHE3/51 suitable for 24 V automotive systems?
Yes, the 1.5KA18AHE3/51 is explicitly rated for 12 V and 24 V automotive applications. Its 15.3 V stand-off voltage (VWM) safely blocks normal 24 V rail fluctuations, while its 17.1–18.9 V breakdown range and 25.2 V clamping voltage provide margin for ISO 7637-2 Pulse 5a (load dump) transients up to ±75 V in 24 V systems.
Does the 1.5KA18AHE3/51 meet AEC-Q101 requirements?
Yes, the 1.5KA18AHE3/51 is AEC-Q101 qualified, as confirmed in the Vishay datasheet (Document Number 88300, Revision 20-Oct-08) under "Mechanical Data" and "Notes" sections. The HE3 suffix denotes high-reliability, automotive-grade construction validated for temperature cycling, humidity, and mechanical shock per AEC-Q101 test plan.
What is the junction capacitance of the 1.5KA18AHE3/51?
The 1.5KA18AHE3/51 exhibits typical junction capacitance of approximately 1200 pF at 0 V bias and 1 MHz, as inferred from the family's Figure 4 curve (CJ vs. VBR). This value is consistent across the 1.5KA18A variant and impacts high-frequency noise filtering - relevant for CAN/LIN bus line protection where excessive capacitance could attenuate signal edges.
Can the 1.5KA18AHE3/51 be used in place of the 1.5KA18A without design changes?
Yes - the 1.5KA18AHE3/51 is a direct replacement for 1.5KA18A, sharing identical electrical specifications, DO-201AD package dimensions, and pinout. The HE3/51 suffix indicates RoHS-compliant, AEC-Q101–qualified manufacturing with JESD201 Class 2 whisker resistance, requiring no PCB or schematic modifications.
1.5KA18AHE3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- PAR®
- Packaging:
- Bulk
- 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
1.5KA18AHE3/51 FAQ
1.How can I place an order for 1.5KA18AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA18AHE3/51 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 1.5KA18AHE3/51 reliable?
The price and inventory of 1.5KA18AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA18AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KA18AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA18AHE3/51 transactions.
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4.How is shipping managed for 1.5KA18AHE3/51?
1.5KA18AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA18AHE3/51 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 1.5KA18AHE3/51?
For technical support, including 1.5KA18AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA18AHE3/51 requirements.
6.How does Aetrix verify that 1.5KA18AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KA18AHE3/51 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 1.5KA18AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KA18AHE3/51?
All 1.5KA18AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA18AHE3/51, 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 1.5KA18AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KA18AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA18AHE3/51 Tags
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