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Vishay General Semiconductor - Diodes Division 1.5KA18AHE3/54
- Part No.:
- 1.5KA18AHE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA18AHE3/54.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:4,302
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Product details
Overview
1.5KA18AHE3/54 from Vishay General Semiconductor is an automotive-grade unidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in power and signal lines. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 25.2 V under 59.5 A surge current, and operates up to +185 °C junction temperature - ideal for protecting MOSFETs and sensor interfaces in automotive engine control units.
For engineers reviewing the 1.5KA18AHE3/54 datasheet, 1.5KA18AHE3/54 pinout, 1.5KA18AHE3/54 application, or 1.5KA18AHE3/54 equivalent, key selection criteria include its AEC-Q101 qualification, 17.1–18.9 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 patented PAR® construction for stable clamping under repetitive transients and features a molded epoxy case rated UL 94 V-0. Its unidirectional polarity and cathode-indicating band support standard DC rail protection topologies without polarity ambiguity.
Designed for automotive environments, it sustains operation from –65 °C to +185 °C, withstands 200 A non-repetitive forward surge (8.3 ms half-sine), and maintains <1 µA leakage at 15.3 V stand-off voltage - enabling robust protection of 12 V and 24 V board-level circuits against load dump and inductive switching events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - handles ISO 7637-2 Pulse 5a/b load dump surges without failure |
| Breakdown Voltage VBR | 17.1–18.9 V at 1 mA - ensures reliable triggering above nominal 12 V system rails |
| Clamping Voltage VC | 25.2 V at 59.5 A - limits protected circuit stress below 28 V absolute max rating |
| Stand-off Voltage VWM | 15.3 V - blocks normal operating voltage while allowing margin for ripple and tolerance |
| Junction Temp. Range | –65 °C to +185 °C - supports under-hood placement in AEC-Q101-compliant ECUs |
| Surge Current IPPM | 59.5 A (10/1000 µs) - exceeds SAE J1113-11 Level 5 immunity requirements |
| Tempco of VBR | 0.088 %/°C - minimizes voltage drift across engine bay thermal cycles |
Pinout & Package
Package: Case Style 1.5KA - axial-leaded, molded epoxy body (UL 94 V-0), 0.375" (9.5 mm) lead length, matte tin-plated leads compliant with J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; enables unidirectional clamping to GND |
| Cathode | High-side connection point | Marked by color band; connects to protected line (e.g., battery rail or signal input) |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables consistent clamping performance over 1000+ surge events without parameter shift |
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, HTRB, and ESD testing |
| HE3 suffix compliance | Meets JESD201 Class 2 whisker resistance - critical for long-term reliability in high-vibration systems |
| 1500 W pulse rating | Provides margin against worst-case ISO 7637-2 and IEC 61000-4-5 surge waveforms |
| Low incremental surge resistance | Reduces clamping overshoot during fast-rising transients (<1 ns rise time) |
Applications
| Engine Control Unit (ECU) Power Input Protection | Automotive Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V supply rail of engine control modules against load dump transients per ISO 7637-2 Pulse 5. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and DC-DC input stage. Use Value: Limits voltage to ≤25.2 V during 59.5 A surges, preventing damage to downstream LDOs and microcontrollers. | Use Scenario: Safeguarding analog outputs of pressure or temperature sensors exposed to inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS on sensor output line, grounded at PCB return plane. Use Value: Clamps ESD and fast transients below 30 V while adding <10 pF capacitance - preserving signal integrity up to 1 MHz. |
| Body Control Module (BCM) LIN Bus Protection | Automotive Lighting Driver Protection |
Use Scenario: Shielding LIN transceiver I/O pins from coupling-induced spikes in door module wiring harnesses. IC Role / Device Role / Timing Role: TVS placed between LIN data line and chassis ground, adjacent to connector. Use Value: Responds in <1 ns to meet ISO 10605 ESD immunity (±25 kV air, ±20 kV contact) without distorting 19.2 kbps signaling. | Use Scenario: Protecting high-side MOSFET gate drivers in LED headlamp modules from inductive kickback. IC Role / Device Role / Timing Role: TVS connected from driver output to ground, absorbing flyback energy during PWM turn-off. Use Value: Absorbs 1500 W pulses without degradation, extending MOSFET lifetime in thermally constrained headlamp enclosures. |
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 | 600 W rating (vs. 1500 W); same VBR range but lower IPPM (32.4 A) | Not suitable for load dump; limited to ESD and low-energy transients | Select only for space-constrained PCBs where surge energy is <600 W |
| 1.5KE18A | Same 1500 W rating but TO-204AA (DO-4) package; no AEC-Q101 qualification | Lacks automotive reliability validation; not approved for under-hood use | Acceptable for industrial or consumer designs requiring identical electrical specs but no automotive certification |
Compared with SMBJ18AHE3/52 and 1.5KE18A, the 1.5KA18AHE3/54 uniquely combines 1500 W surge capability, AEC-Q101 qualification, and JESD201 Class 2 whisker resistance - making it the only option qualified for high-reliability automotive power rail protection.
Availability
1.5KA18AHE3/54 is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, sensor interface circuits, and LED lighting drivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1.5KA18AHE3/54 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 optoelectronics for automotive, industrial, and computing markets.
The 1.5KA series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing thermal stability, surge endurance, and long-term whisker resistance in axial-leaded packages.
FAQ
What is the exact breakdown voltage range for 1.5KA18AHE3/54?
The 1.5KA18AHE3/54 has a guaranteed breakdown voltage (VBR) range of 17.1 V to 18.9 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range ensures reliable activation above 15.3 V stand-off voltage while accommodating manufacturing tolerances and temperature drift - critical for stable protection in 12 V automotive systems.
Is 1.5KA18AHE3/54 suitable for bidirectional transient suppression?
No, the 1.5KA18AHE3/54 is unidirectional only, as confirmed in its Vishay datasheet Document Number 88300. It protects against positive-going transients on a line referenced to ground. For AC or bipolar signal lines, a dedicated bidirectional TVS such as SMAJ18A must be used instead of relying on reverse conduction of the 1.5KA18AHE3/54.
Does 1.5KA18AHE3/54 require a heatsink for continuous power dissipation?
No - the 1.5KA18AHE3/54 is rated for 6.5 W power dissipation only when mounted on an infinite heatsink at 75 °C lead temperature (TL). In normal operation, it handles only transient energy; steady-state power dissipation is negligible. Its design relies on thermal mass of leads and PCB copper, not external heatsinking.
What does the "HE3/54" suffix mean in 1.5KA18AHE3/54?
The "HE3" suffix indicates RoHS-compliant, high-reliability construction meeting JESD201 Class 2 whisker resistance, while "/54" denotes the preferred packaging code: 13-inch paper tape and reel, 1400 units per reel. This packaging format supports automated SMT placement despite the axial-leaded form factor via carrier tape orientation.
How does 1.5KA18AHE3/54 perform under high-temperature operating conditions?
The 1.5KA18AHE3/54 maintains full functionality from –65 °C to +185 °C junction temperature and derates linearly above 25 °C ambient per Figure 2 in its datasheet. At 125 °C ambient, its peak pulse power remains >800 W - sufficient for sustained operation in engine compartment locations where other TVS devices fail prematurely.
1.5KA18AHE3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- 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
1.5KA18AHE3/54 FAQ
1.How can I place an order for 1.5KA18AHE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA18AHE3/54 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 1.5KA18AHE3/54 reliable?
The price and inventory of 1.5KA18AHE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA18AHE3/54 is usually 5 days.
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Once your 1.5KA18AHE3/54 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 1.5KA18AHE3/54?
For technical support, including 1.5KA18AHE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA18AHE3/54 requirements.
6.How does Aetrix verify that 1.5KA18AHE3/54 is sourced from the original manufacturer or authorized distributors?
All 1.5KA18AHE3/54 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 1.5KA18AHE3/54 meets industry standards.
7.What is the process for return or replacement of 1.5KA18AHE3/54?
All 1.5KA18AHE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA18AHE3/54, 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 1.5KA18AHE3/54 part is unused and in its original packaging.
Return procedure for 1.5KA18AHE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA18AHE3/54 Tags
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