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Vishay General Semiconductor - Diodes Division 1.5KE18AHE3/51
- Part No.:
- 1.5KE18AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE18AHE3/51.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC 1.5KE
- Quantity:
- Payment:
- Shipping:
Inventory:7,115
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Product details
Overview
1.5KE18AHE3/51 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of DC power rails and signal lines. It features a 17.1 V minimum breakdown voltage (VBR), 15.3 V maximum stand-off voltage (VWM), 25.2 V clamping voltage at 59.5 A peak pulse current, 1500 W peak pulse power rating (10/1000 µs), and AEC-Q101 qualification for automotive-grade reliability - deployed in automotive body control modules to protect microcontroller I/O against load-dump transients.
For engineers reviewing the 1.5KE18AHE3/51 datasheet, 1.5KE18AHE3/51 pinout, 1.5KE18AHE3/51 application, or 1.5KE18AHE3/51 equivalent, key selection criteria include clamping performance under 10/1000 µs surge, unidirectional polarity marking, JEDEC-standard 1.5KE package thermal resistance (RθJL = 15.4 °C/W), and compliance with JESD 201 Class 2 whisker testing.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse-biased voltage exceeds VBR, it avalanches into low-impedance conduction to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM), while the molded epoxy case meets UL 94 V-0 flammability rating.
The device is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine), supports continuous power dissipation of 6.5 W on infinite heatsink at TL = 75 °C, and exhibits a temperature coefficient of VBR of +0.089 %/°C - enabling predictable derating across -55 °C to +175 °C operating junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA test current - defines precise avalanche onset threshold for reliable triggering |
| VWM | 15.3 V maximum - ensures no conduction during normal 12 V automotive system operation |
| VC @ IPPM | 25.2 V at 59.5 A (10/1000 µs) - limits protected node voltage to safe level during worst-case surge |
| PPPM | 1500 W peak pulse power - handles ISO 7637-2 Pulse 5a load-dump energy without failure |
| IFSM | 200 A peak forward surge - withstands high-current inductive kickback in relay/motor drive circuits |
| TJ max. | +175 °C - enables placement near heat-generating components in engine bay applications |
| RθJL | 15.4 °C/W - allows direct PCB copper pour thermal coupling for sustained power handling |
Pinout & Package
Package: JEDEC-standard Case Style 1.5KE - axial-lead, molded epoxy body (0.375" lead length), RoHS-compliant matte tin plating, UL 94 V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / surge return path | Connected to ground or low-impedance return plane; must handle full IPPM without trace fusing |
| Cathode | Protected line connection / clamping reference | Marked with color band; connects to rail being protected (e.g., 12 V battery feed); defines VWM polarity |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5 %) and <1 µA leakage at VWM after 1000 hrs HTOL stress |
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling (-40 °C to +125 °C, 1000 cycles) and humidity bias HAST |
| 1500 W 10/1000 µs rating | Clamps ISO 16750-2 Load Dump (12 V system, 100 V/1 s) with margin before thermal runaway |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth under high-humidity, high-temperature storage - critical for long-life automotive modules |
| UL 94 V-0 molding compound | Self-extinguishing epoxy prevents flame propagation in enclosed ECU housings during fault conditions |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects microcontroller GPIO pins and CAN transceiver power rails from alternator load-dump spikes and relay coil flyback in vehicle door modules. IC Role / Device Role / Timing Role: Uni-directional shunt clamp placed between 12 V supply and ground, triggered within 1 ns to limit transient voltage to ≤25.2 V. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V logic ICs by maintaining rail voltage below absolute maximum ratings during 100 V/1 s load dump events. |
Use Scenario: Shields 24 V DC digital input optocouplers from inductive switching surges generated by solenoid valves and contactors in factory automation systems. IC Role / Device Role / Timing Role: Primary front-end protection element mounted directly at terminal block entry, clamping fast-rising transients (tr < 1 ns) before they reach isolation barrier. Use Value: Eliminates need for secondary RC snubbers by absorbing >1500 W surge energy in single component, reducing BOM count and PCB area. |
| Telecom Power Supply Front-End | Consumer Appliance Motor Drive Board |
Use Scenario: Guards AC-DC adapter output stage against lightning-induced surges coupled through building wiring in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Secondary-side TVS on +48 V DC bus, coordinated with upstream MOVs to provide staged clamping per IEC 61000-4-5 Level 4. Use Value: Achieves <500 ps response time and <25.2 V clamping to prevent overvoltage shutdown of PMICs and DC-DC controllers during 4 kV ring-wave tests. |
Use Scenario: Safeguards MCU reset and communication lines in washing machine main control board exposed to motor commutation noise and pump relay bounce. IC Role / Device Role / Timing Role: Localized point-of-use protection on 5 V/3.3 V rails feeding Hall-effect sensors and UART interfaces. Use Value: Maintains system uptime by preventing false resets and UART framing errors caused by sub-100 ns transients exceeding 30 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | DO-214AA package (SMB), lower PPPM = 600 W, same VBR range (17.1–18.9 V), RθJA = 110 °C/W | Surface-mount only; unsuitable for high-power chassis-mount or wire-ended designs requiring >1 kW surge handling | Select SMBJ18A only when space-constrained PCB layout mandates SMD and surge energy is limited to IEC 61000-4-2 contact discharge (±8 kV) |
| 1.5KE18CA | Bi-directional variant (no polarity marking), identical VBR/VC/PPPM, but VWM = 15.3 V applies in both directions | Required for AC-coupled lines or bidirectional data buses (e.g., RS-485) where reverse polarity surges occur | Choose 1.5KE18CA only when protecting symmetric signals; 1.5KE18AHE3/51 remains optimal for DC power rails with defined ground reference |
Compared with SMBJ18A, 1.5KE18AHE3/51 delivers 2.5× higher surge power handling and superior thermal coupling via axial leads, while 1.5KE18CA trades unidirectional precision for bidirectional symmetry - making 1.5KE18AHE3/51 the preferred choice for cost-sensitive, high-energy DC protection where polarity is fixed and PCB real estate permits through-hole mounting.
Availability
1.5KE18AHE3/51 is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply with AEC-Q101 assurance and long-term production continuity.
Supply support for 1.5KE18AHE3/51 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, MOSFETs, and passive components for automotive, industrial, and computing markets.
The 1.5KE series was engineered specifically for robust, high-energy transient suppression in harsh environments - targeting automotive load-dump immunity, industrial motor drive EMI filtering, and telecom surge survivability per IEC/EN standards.
FAQ
What is the clamping voltage of the 1.5KE18AHE3/51 under a standard 10/1000 µs surge?
The 1.5KE18AHE3/51 clamps to a maximum of 25.2 V at its rated peak pulse current of 59.5 A using the 10/1000 µs waveform. This value is measured per JEDEC standard test conditions and guarantees that protected circuit nodes will not exceed this voltage during specified surge events, ensuring compatibility with 3.3 V and 5 V logic families.
Is the 1.5KE18AHE3/51 qualified for automotive applications?
Yes, the 1.5KE18AHE3/51 carries AEC-Q101 qualification (documented in Vishay's 88301 datasheet revision 11-Oct-16). It has passed stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - confirming suitability for under-hood and body-control module deployments in passenger vehicles and commercial fleets.
How does the HE3 suffix affect the 1.5KE18AHE3/51 specification?
HE3 denotes RoHS compliance plus AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. Unlike base-E3 parts, HE3 devices undergo additional reliability screening for automotive use and feature enhanced tin-lead-free plating validated for >1000 hrs under high-humidity bias conditions - a requirement explicitly confirmed for 1.5KE18AHE3/51 in the datasheet notes.
What is the maximum operating temperature for the 1.5KE18AHE3/51?
The 1.5KE18AHE3/51 has a maximum junction temperature (TJ) of +175 °C and an operating ambient/storage range of -55 °C to +175 °C. Its thermal resistance from junction to lead (RθJL) is 15.4 °C/W, enabling effective heat transfer to PCB copper when mounted with ≥0.375" lead length - critical for sustaining repeated surge events in engine compartment environments.
Can the 1.5KE18AHE3/51 be used in bi-directional signal protection?
No - the 1.5KE18AHE3/51 is strictly uni-directional, with cathode marked by a color band. For bi-directional protection (e.g., RS-485, AC lines), Vishay specifies the 1.5KE18CA variant. Using 1.5KE18AHE3/51 on AC or reversibly biased signals risks forward conduction and failure during negative half-cycles, as confirmed by polarity definition in the mechanical data section of the datasheet.
1.5KE18AHE3/51 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- TransZorb®
- 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:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 1.5KE
1.5KE18AHE3/51 FAQ
1.How can I place an order for 1.5KE18AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE18AHE3/51 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 1.5KE18AHE3/51 reliable?
The price and inventory of 1.5KE18AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE18AHE3/51 is usually 5 days.
3.What payment methods are accepted for 1.5KE18AHE3/51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE18AHE3/51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE18AHE3/51?
1.5KE18AHE3/51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE18AHE3/51 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 1.5KE18AHE3/51?
For technical support, including 1.5KE18AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE18AHE3/51 requirements.
6.How does Aetrix verify that 1.5KE18AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KE18AHE3/51 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 1.5KE18AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KE18AHE3/51?
All 1.5KE18AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE18AHE3/51, 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 1.5KE18AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KE18AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE18AHE3/51 Tags
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