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Taiwan Semiconductor Corporation 1.5KE27A
- Part No.:
- 1.5KE27A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE27A.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:3,400
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Product details
Overview
1.5KE27A from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode with a nominal breakdown voltage of 27 V, minimum VBR of 25.7 V at 1.0 mA test current, maximum clamping voltage VC of 37.5 V at 42 A peak pulse current, and DO-201 axial package - used to protect automotive power rails and industrial control inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1.5KE27A datasheet, 1.5KE27A pinout, 1.5KE27A application, or 1.5KE27A equivalent, key selection criteria include its 23.1 V working stand-off voltage, <1 µA leakage above 10 V, 175 °C junction temperature rating, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
The 1.5KE27A operates as a unidirectional avalanche diode, clamping overvoltage transients by entering breakdown when reverse voltage exceeds VBR = 25.7–28.4 V. Its low dynamic impedance ensures rapid energy diversion during 10/1000 µs surges up to 1500 W.
It features pure tin-plated leads compliant with J-STD-002 solderability, meets JESD 201 Class 2 whisker resistance, and uses UL 94V-0 molding compound. Polarity is marked by a cathode band, and it is rated for -55 °C to +175 °C operating and storage temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 25.7–28.4 V - defines precise avalanche onset threshold for reliable clamping initiation |
| VWM | 23.1 V - maximum continuous reverse voltage before leakage exceeds 1 µA |
| VC @ IPP = 42 A | 37.5 V - peak clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPK | 1500 W - non-repetitive surge power handling per JEDEC standard waveform |
| IFSM | 200 A - peak forward surge current tolerance for unidirectional operation only |
| TJMAX | +175 °C - enables use in under-hood automotive environments without derating |
| Package | DO-201 - industry-standard axial leaded package with 0.090 g mass and RoHS/halogen-free compliance |
Pinout & Package
DO-201 package: axial-leaded, cylindrical epoxy body with cathode band marking polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance. Mounting requires 0.375" (9.5 mm) lead length for 5 W steady-state dissipation on 16 mm × 16 mm copper pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path in unidirectional protection configuration |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 24 V rail); cathode band identifies this terminal physically |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and ESD |
| 1500 W surge capability | Withstands ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance stabilization) |
| Clamping response time | <1.0 ps from 0 V to VBR - ensures sub-nanosecond reaction to fast-rising EFT or ESD events |
| Low leakage current | <1 µA at 23.1 V - minimizes standby power loss in always-on automotive modules |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in engine control units (ECUs) from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and local regulator input to clamp transients before LDO or DC-DC stage. Use Value: Limits clamped voltage to 37.5 V, preventing damage to 40 V-rated regulators and ensuring ASIL-B functional safety compliance. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Front-end transient suppression on 24 V dry-contact inputs prior to optocoupler or Schmitt trigger interface. Use Value: Withstands repeated 1 kV/500 A 10/1000 µs surges per IEC 61000-4-5 Level 4, extending field service life. |
| LED Driver Overvoltage Clamp | Telecom Line Interface Protection |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers in outdoor signage exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output terminals to shunt transient energy away from MOSFET switches and current-sense resistors. Use Value: Clamps 1500 W pulses within 37.5 V, preserving 40 V-rated driver ICs and maintaining luminance stability during surge events. |
Use Scenario: Shielding RS-485 transceivers in building automation systems from induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional-capable variant (e.g., 1.5KE27CA) not applicable here; 1.5KE27A used in unidirectional DC bias rail protection upstream of transceiver VCC. Use Value: Maintains 23.1 V operating margin while suppressing common-mode spikes that could disrupt communication integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ24A | Lower peak power (400 W), smaller SMA package, VBR = 26.7–29.5 V, VC = 38.9 V @ 10.3 A | Not AEC-Q101 qualified; suitable for commercial-grade consumer or industrial equipment only | Select when board space is constrained and automotive qualification is unnecessary |
| ON Semiconductor 1.5SMC27A | Same DO-201 package, identical VBR/VC specs, but rated for 1500 W at 25 °C only (derates faster above 25 °C) | Meets ISO 7637-2 but lacks explicit AEC-Q101 documentation; used in Tier-2 automotive subsystems | Choose if sourcing flexibility across multiple franchises is prioritized and full AEC-Q101 audit trail is not required |
Compared with Littelfuse SMAJ24A and ON Semi 1.5SMC27A, the 1.5KE27A delivers verified AEC-Q101 qualification, superior thermal robustness up to +175 °C, and consistent 1500 W surge performance across its full temperature range - making it the preferred choice for mission-critical automotive power protection.
Availability
1.5KE27A is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, LED lighting drivers, and telecom infrastructure requiring stable component supply with traceable sourcing and lifecycle continuity.
Supply support for 1.5KE27A 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The 1.5KE series was designed specifically for high-energy transient suppression in harsh automotive and industrial environments, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and robust thermal performance in legacy axial packages.
FAQ
What is the breakdown voltage range of the 1.5KE27A?
The 1.5KE27A has a guaranteed breakdown voltage range of 25.7 V to 28.4 V at a 1.0 mA test current (IT), measured per ANSI/IEEE C62.35. This tight VBR window ensures predictable clamping behavior in 24 V system designs and aligns with nominal 27 V rating for compatibility with standard automotive voltage rails.
Is the 1.5KE27A suitable for bidirectional transient protection?
No - the 1.5KE27A is a unidirectional TVS diode, identified by its single cathode band marking and specified parameters (e.g., forward voltage VF = 3.5 V @ 50 A). For bidirectional protection, select the 1.5KE27CA variant, which provides symmetrical clamping in both polarities and omits the forward voltage specification.
Does the 1.5KE27A meet AEC-Q101 requirements?
Yes - the 1.5KE27A is explicitly AEC-Q101 qualified, as confirmed in Taiwan Semiconductor's official 1.5KE series datasheet (Version O2104). Qualification covers high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and ESD testing per HBM and CDM models.
What is the maximum clamping voltage of the 1.5KE27A during a surge event?
The 1.5KE27A exhibits a maximum clamping voltage (VC) of 37.5 V when subjected to its rated peak pulse current of 42 A under the standard 10/1000 µs waveform. This value is critical for ensuring downstream components - such as 40 V-rated regulators or microcontrollers - remain within safe operating limits during transient events.
How does the 1.5KE27A compare to the 1.5KE27 (non-A suffix) version?
The 1.5KE27A offers tighter parameter tolerances versus the base 1.5KE27: VBR is 25.7–28.4 V (vs. 24.3–29.7 V), VWM is 23.1 V (vs. 21.8 V), and VC is 37.5 V (vs. 39.1 V). These improvements reduce clamping uncertainty and improve system-level surge margin, especially in safety-critical automotive applications where consistency is mandated.
1.5KE27A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- 1.5KE
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 42A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE27A FAQ
1.How can I place an order for 1.5KE27A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE27A 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 1.5KE27A reliable?
The price and inventory of 1.5KE27A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE27A is usually 5 days.
3.What payment methods are accepted for 1.5KE27A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE27A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE27A?
1.5KE27A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE27A 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 1.5KE27A?
For technical support, including 1.5KE27A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE27A requirements.
6.How does Aetrix verify that 1.5KE27A is sourced from the original manufacturer or authorized distributors?
All 1.5KE27A 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 1.5KE27A meets industry standards.
7.What is the process for return or replacement of 1.5KE27A?
All 1.5KE27A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE27A, 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 1.5KE27A part is unused and in its original packaging.
Return procedure for 1.5KE27A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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