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Vishay General Semiconductor - Diodes Division 1.5KA18HE3/51
- Part No.:
- 1.5KA18HE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA18HE3/51.pdf
- Description:
- TVS DIODE 14.5VWM 26.5VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:4,148
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Product details
Overview
1.5KA18HE3/51 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode designed for high-energy surge protection in harsh environments. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 26.5 V under 56.6 A peak pulse current, and operates up to +185 °C junction temperature - ideal for protecting automotive sensor signal lines and MOSFET gate drivers against load-switching transients.
For engineers reviewing the 1.5KA18HE3/51 datasheet, 1.5KA18HE3/51 pinout, 1.5KA18HE3/51 application, or 1.5KA18HE3/51 equivalent, key selection criteria include its AEC Q101 qualification, 16.2–19.8 V breakdown range, low 0.088 %/°C VBR tempco, and HE3 suffix compliance with JESD201 Class 2 whisker resistance.
Technical Context
This TVS diode uses Vishay's patented PAR® construction for stable clamping under repeated surge stress and maintains performance across -65 °C to +185 °C operating range. Its unidirectional polarity and 1.5KA case style support high-reliability placement on automotive PCBs where space-constrained layouts require robust overvoltage immunity without polarity reversal risk.
The device features low incremental surge resistance and fast response time (<1 ns), enabling effective suppression of inductive switching spikes (e.g., relay coil turn-off) before sensitive downstream ICs experience overstress. Its 3.5 V max forward voltage at 100 A ensures minimal conduction loss during forward-biased fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W (10/1000 µs waveform); sustains single high-energy surges common in 12 V automotive systems |
| Breakdown Voltage VBR | 16.2–19.8 V at 1 mA; ensures reliable triggering above normal 12 V rail noise while avoiding false trips |
| Clamping Voltage VC | 26.5 V at 56.6 A IPPM; limits voltage seen by protected circuitry to safe levels during surge events |
| Operating Temperature | -65 °C to +185 °C; validated for under-hood automotive use per AEC Q101 requirements |
| Surge Current IPPM | 56.6 A (10/1000 µs); handles typical ISO 7637-2 Pulse 1 & 2a transients without degradation |
| Tempco of VBR | 0.088 %/°C; minimizes drift across wide ambient ranges, critical for precision sensor interface protection |
| RoHS & Reliability | RoHS-compliant HE3 suffix; passes JESD201 Class 2 whisker test and AEC Q101 qualification |
Pinout & Package
Package: Case Style 1.5KA - molded epoxy body with matte tin-plated leads; UL 94 V-0 rated; lead length 0.375" (9.5 mm); cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to ground or lower-potential node; enables unidirectional clamping to GND |
| Cathode | Current exit terminal in forward bias; marked with color band | Connected to protected line (e.g., sensor output); conducts surge current to ground during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Ensures consistent clamping performance and long-term reliability under repetitive surge stress |
| AEC Q101 qualification | Validated for automotive under-hood applications including engine control and ADAS sensor modules |
| 1500 W peak pulse rating | Meets ISO 7637-2 and SAE J1113-11 surge immunity requirements for 12 V systems |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth in high-temperature, long-life automotive deployments |
| Low 0.088 %/°C VBR tempco | Maintains tight breakdown tolerance across full operating temperature range |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine compartments exposed to load-dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤26.5 V, preventing ADC saturation and ESD damage while maintaining signal integrity below 19.8 V standoff. |
Use Scenario: Safeguarding logic-level inputs of motor driver ICs (e.g., half-bridge gate drivers) from back-EMF spikes during PWM switching. IC Role / Device Role / Timing Role: Fast-response surge suppressor connected from driver enable/input pin to ground. Use Value: Clamps sub-100 ns spikes to safe levels before driver internal circuitry experiences latch-up or oxide rupture. |
| Automotive Lighting Control | Telecom Power Interface |
Use Scenario: Shielding CAN/LIN bus transceivers and LED driver controllers from alternator load-dump transients in headlight and tail-light modules. IC Role / Device Role / Timing Role: Primary overvoltage protection on 12 V supply rail feeding lighting control ASICs. Use Value: Absorbs 1500 W pulses without failure, preserving system uptime and meeting OEM EMC immunity specs (e.g., CISPR 25 Class 4). |
Use Scenario: Front-end protection for PoE-powered telecom equipment receiving DC power over twisted-pair cabling. IC Role / Device Role / Timing Role: Secondary surge clamp on DC input after primary MOV/GDT stage. Use Value: Provides precise clamping at 26.5 V to protect 24 V-rated DC-DC converters from residual transients missed by bulk suppressors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18AHE3/52 | Lower peak power (600 W), same 18 V nominal breakdown, SMB package (smaller footprint) | Not AEC Q101 qualified; suitable for non-automotive industrial use only | Select when board space is constrained and surge energy is ≤600 W; not for under-hood deployment |
| 1.5KE18A | Same 18 V breakdown but legacy 1.5KE case; no HE3 whisker compliance; RoHS but not AEC Q101 | Lacks automotive qualification and JESD201 Class 2 testing; higher thermal resistance | Acceptable for cost-sensitive consumer/industrial designs where AEC Q101 is not mandated |
Compared with SMBJ18AHE3/52 and 1.5KE18A, the 1.5KA18HE3/51 uniquely combines AEC Q101 qualification, 1500 W capability, and JESD201 Class 2 whisker resistance - making it the only choice for mission-critical automotive signal-line protection requiring zero field failures.
Availability
1.5KA18HE3/51 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial motor drive inputs, and telecom power interfaces requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for 1.5KA18HE3/51 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 AEC Q101-compliant transient suppression in automotive power and signal networks - emphasizing thermal stability, surge endurance, and long-term whisker-free solder joint integrity.
FAQ
What is the breakdown voltage range of the 1.5KA18HE3/51?
The 1.5KA18HE3/51 has a guaranteed breakdown voltage (VBR) range of 16.2 V to 19.8 V at 1 mA test current, measured per ANSI/IEEE C62.35 standards. This range ensures reliable activation above normal 12 V system noise while avoiding premature conduction during nominal operation. The 1.5KA18HE3/51 maintains this specification across its full -65 °C to +185 °C operating junction temperature range.
Is the 1.5KA18HE3/51 qualified for automotive use?
Yes, the 1.5KA18HE3/51 is explicitly AEC Q101 qualified and designated as high-reliability/automotive grade in its mechanical data. It meets all stress tests required for under-hood deployment, including temperature cycling, humidity bias, and accelerated life testing. The HE3 suffix further confirms compliance with JESD201 Class 2 whisker resistance - a mandatory requirement for modern automotive electronics.
What does the HE3 suffix mean on the 1.5KA18HE3/51?
The HE3 suffix on the 1.5KA18HE3/51 indicates RoHS compliance, high-reliability construction, and successful completion of JESD201 Class 2 whisker testing. It also signifies that the device is manufactured to Vishay's automotive-grade process controls and is qualified per AEC Q101. This suffix distinguishes it from standard commercial variants and confirms suitability for long-life, high-temperature automotive applications.
What is the maximum clamping voltage of the 1.5KA18HE3/51 under surge conditions?
The 1.5KA18HE3/51 has a maximum clamping voltage (VC) of 26.5 V at 56.6 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and represents the upper limit of voltage imposed on protected circuitry during worst-case surge events. The 1.5KA18HE3/51 achieves this clamping performance while sustaining 1500 W peak pulse power.
Can the 1.5KA18HE3/51 be used in bidirectional configurations?
No, the 1.5KA18HE3/51 is specified for uni-directional polarity only, as confirmed in its official features list. It contains a single PN junction configured to clamp positive transients to ground and does not provide reverse-polarity protection. For bidirectional protection, a separate device such as the 1.5KA18CAHE3/51 (if available) or a dual-diode configuration would be required - the 1.5KA18HE3/51 itself is not suitable for AC or reversible signal line protection.
1.5KA18HE3/51 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):
- 14.5V
- Voltage - Breakdown (Min):
- 16.2V
- Voltage - Clamping (Max) @ Ipp:
- 26.5V
- Current - Peak Pulse (10/1000µs):
- 56.6A
- 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
1.5KA18HE3/51 FAQ
1.How can I place an order for 1.5KA18HE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA18HE3/51 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 1.5KA18HE3/51 reliable?
The price and inventory of 1.5KA18HE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA18HE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KA18HE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KA18HE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KA18HE3/51?
1.5KA18HE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KA18HE3/51 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 1.5KA18HE3/51?
For technical support, including 1.5KA18HE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA18HE3/51 requirements.
6.How does Aetrix verify that 1.5KA18HE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KA18HE3/51 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 1.5KA18HE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KA18HE3/51?
All 1.5KA18HE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA18HE3/51, 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 1.5KA18HE3/51 part is unused and in its original packaging.
Return procedure for 1.5KA18HE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA18HE3/51 Tags
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