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Vishay General Semiconductor - Diodes Division 1.5KA27AHE3/51
- Part No.:
- 1.5KA27AHE3/51
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KA27AHE3/51.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC 1.5KA
- Quantity:
- Payment:
- Shipping:
Inventory:2,496
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Product details
Overview
1.5KA27AHE3/51 from Vishay General Semiconductor is a unidirectional automotive-grade transient voltage suppressor (TVS) diode designed for high-energy surge clamping in power and signal lines. It features a 25.7–28.4 V breakdown voltage (VBR), 1500 W peak pulse power (10/1000 µs), 37.5 V maximum clamping voltage at 40 A, and AEC-Q101 qualification for under-hood automotive electronics.
For engineers reviewing the 1.5KA27AHE3/51 datasheet, 1.5KA27AHE3/51 pinout, 1.5KA27AHE3/51 application, or 1.5KA27AHE3/51 equivalent, key selection criteria include clamping performance under 10/1000 µs transients, junction temperature derating above 25 °C, unidirectional polarity confirmation, and compliance with automotive reliability standards including JESD201 Class 2 whisker resistance.
Technical Context
This TVS diode employs Vishay's patented PAR® construction for stable clamping under repetitive surge stress and operates across –65 °C to +185 °C junction temperature. Its low incremental surge resistance and fast response time ensure effective protection of downstream MOSFETs and ICs against load dump and inductive switching transients.
The device is rated for 200 A non-repetitive forward surge (8.3 ms half-sine) and exhibits a +0.096 %/°C temperature coefficient of VBR, enabling predictable voltage shift over wide thermal ranges in engine control units and ADAS power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 25.7 V / 28.4 V at 1.0 mA - defines precise clamping onset threshold for overvoltage detection |
| VC @ IPPM | 37.5 V at 40.0 A - maximum clamped voltage during 1500 W transient, limiting stress on protected ICs |
| PPPM | 1500 W (10/1000 µs) - energy-handling capacity sufficient for ISO 7637-2 Pulse 5a/b load dump events |
| TJ max. | +185 °C - enables placement near high-temperature sources such as power converters or motor drivers |
| AEC-Q101 qualified | Yes - validated for automotive use per stress test requirements including HTOL, TCT, and HAST |
| RoHS & WEEE compliant | Yes - HE3 suffix denotes lead-free matte tin plating and full environmental compliance |
| VWM | 23.1 V - maximum continuous reverse working voltage before leakage exceeds 1 µA at 150 °C |
Pinout & Package
Package: Case Style 1.5KA - molded epoxy body with matte tin-plated leads; UL 94 V-0 rated; 0.375" (9.5 mm) lead length; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to ground or lower-potential rail in unidirectional clamping configuration |
| Cathode | Current exit point in forward bias; marked with color band | Connected to protected line (e.g., 24 V supply rail); absorbs positive transients to ground |
Key Features
| Feature | Design Value |
|---|---|
| Patented PAR® construction | Enables consistent clamping performance across 1000+ surge cycles without parameter drift |
| 1500 W peak pulse power (10/1000 µs) | Meets ISO 7637-2 Pulse 5a (load dump) and Pulse 1/2b (inductive switch-off) immunity requirements |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns rise time), improving protection margin |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling, critical for long-life automotive modules |
| High-temperature operation (TJ = 185 °C) | Supports direct mounting on power boards in engine control units without external heatsinking |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Supply |
|---|---|
Use Scenario: Protection of 24 V microcontroller power rails against load dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery input and DC-DC converter input. Use Value: Limits transient voltage to ≤37.5 V, preventing latch-up or damage to 40 V-rated buck controller ICs. |
Use Scenario: Safeguarding gate driver supply lines in 3-phase IGBT inverters subjected to inductive kickback. IC Role / Device Role / Timing Role: Fast-response surge clamp on isolated 15 V gate supply, referenced to power ground. Use Value: Clamps 10/1000 µs surges within 1 ns, preserving gate oxide integrity of high-side IGBTs. |
| ADAS Camera Module Power Input | Telecom Remote Radio Head (RRH) DC Feed |
Use Scenario: Shielding 12 V imaging sensor power from ignition noise and ESD coupling via coaxial cable shield. IC Role / Device Role / Timing Role: Primary front-end TVS on camera module PCB, mounted adjacent to connector. Use Value: Withstands 200 A surge (8.3 ms) while maintaining <1 µA leakage at 23.1 V, ensuring low-noise analog supply stability. |
Use Scenario: Protecting 48 V DC power feed to outdoor RRH units exposed to lightning-induced surges on tower-mounted cables. IC Role / Device Role / Timing Role: Secondary-level TVS on DC input stage, downstream of bulk MOV protection. Use Value: Provides precise 37.5 V clamping to prevent overvoltage shutdown of PoE-like DC-DC controllers in harsh RF environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/5A | Lower PPPM (400 W), smaller SMA package, VBR = 31.1–34.4 V, no AEC-Q101 qualification | Suitable for consumer/industrial PCBs with space constraints but not automotive under-hood use | Select when cost and footprint are prioritized over automotive reliability and 1500 W surge handling |
| 1.5KE27CA | Bi-directional, same VBR range, 1500 W rating, but TO-204AA (DO-201AE) package and no AEC-Q101 or JESD201 Class 2 compliance | Applicable for AC-coupled or bidirectional signal line protection where polarity reversal may occur | Choose only if bi-directional clamping is required and automotive qualification is not mandatory |
Compared with 1.5KA27AHE3/51, SMAJ28A-E3/5A offers reduced surge capability and no automotive qualification, while 1.5KE27CA provides bi-directional clamping but lacks AEC-Q101 and whisker-resistant plating-making 1.5KA27AHE3/51 the sole option meeting full automotive power rail protection requirements.
Availability
1.5KA27AHE3/51 is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, ADAS camera modules, and telecom remote radio head designs requiring stable component supply with guaranteed AEC-Q101 compliance and high-temperature reliability.
Supply support for 1.5KA27AHE3/51 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 optoelectronics for demanding industrial and automotive applications.
The 1.5KA series is engineered specifically for automotive-grade transient suppression, emphasizing robustness under thermal cycling, high surge repetition tolerance, and compliance with AEC-Q101 and JESD201 standards.
FAQ
What is the exact breakdown voltage range for the 1.5KA27AHE3/51?
The 1.5KA27AHE3/51 has a guaranteed breakdown voltage (VBR) range of 25.7 V to 28.4 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This tight tolerance ensures consistent clamping behavior across production lots and supports reliable design margining in 24 V automotive systems.
Is the 1.5KA27AHE3/51 unidirectional or bidirectional?
The 1.5KA27AHE3/51 is unidirectional only, as confirmed in the Vishay datasheet Document Number 88300. Its cathode is marked with a color band, and it is intended for clamping positive transients to ground-no reverse conduction capability is specified or characterized.
Does the 1.5KA27AHE3/51 meet AEC-Q101 reliability standards?
Yes, the 1.5KA27AHE3/51 is explicitly AEC-Q101 qualified per the datasheet note on page 3. This includes validation for high-temperature operating life, temperature cycling, and humidity testing-making it suitable for under-hood automotive applications.
What is the maximum clamping voltage of the 1.5KA27AHE3/51 at its rated peak pulse current?
The 1.5KA27AHE3/51 clamps to a maximum of 37.5 V at its peak pulse current of 40.0 A (10/1000 µs waveform), as specified in the Electrical Characteristics table. This value directly determines the voltage stress imposed on downstream components during surge events.
What packaging and plating does the 1.5KA27AHE3/51 use?
The 1.5KA27AHE3/51 uses Case Style 1.5KA with matte tin-plated leads compliant with J-STD-002 and JESD22-B102. The HE3 suffix confirms RoHS compliance and JESD201 Class 2 whisker resistance-critical for long-term reliability in thermally cycled automotive modules.
1.5KA27AHE3/51 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):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- 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
1.5KA27AHE3/51 FAQ
1.How can I place an order for 1.5KA27AHE3/51 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KA27AHE3/51 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 1.5KA27AHE3/51 reliable?
The price and inventory of 1.5KA27AHE3/51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KA27AHE3/51 is usually 5 days.
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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 1.5KA27AHE3/51?
For technical support, including 1.5KA27AHE3/51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KA27AHE3/51 requirements.
6.How does Aetrix verify that 1.5KA27AHE3/51 is sourced from the original manufacturer or authorized distributors?
All 1.5KA27AHE3/51 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 1.5KA27AHE3/51 meets industry standards.
7.What is the process for return or replacement of 1.5KA27AHE3/51?
All 1.5KA27AHE3/51 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KA27AHE3/51, 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 1.5KA27AHE3/51 part is unused and in its original packaging.
Return procedure for 1.5KA27AHE3/51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KA27AHE3/51 Tags
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