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Taiwan Semiconductor Corporation 1.5KE27C
- Part No.:
- 1.5KE27C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE27C.pdf
- Description:
- 1500W, 27V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,867
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Product details
Overview
1.5KE27C from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, with nominal breakdown voltage 27V, working stand-off voltage 21.8V, clamping voltage 39.1V at 40A peak pulse current, and junction temperature rating up to +175°C - designed for automotive and industrial power rail protection against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1.5KE27C datasheet, 1.5KE27C pinout, 1.5KE27C application, or 1.5KE27C equivalent, key selection criteria include unidirectional polarity, 10/1000μs surge capability, low dynamic impedance, sub-1ps response time from 0V to VBR, and AEC-Q101 qualification availability in H-suffix variants.
Technical Context
The 1.5KE27C operates as a unidirectional avalanche diode that clamps transient overvoltages above its breakdown threshold while maintaining low leakage (<1μA at 21.8V) under normal operation. Its 1500W peak pulse power rating is defined per 10/1000μs waveform with derating above 25°C ambient.
It features a cathode-banded DO-201 axial package with pure tin-plated leads, meets UL 94V-0 flammability, and supports mounting on 0.6" × 0.6" copper pads for thermal management. Electrical characteristics are specified at TA = 25°C with test current IT = 1.0mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0mA | 24.3–29.7V: Ensures reliable avalanche conduction onset within ±10% tolerance at rated test current. |
| VWM | 21.8V: Maximum continuous reverse operating voltage before significant leakage begins. |
| VC @ IPP = 40A | 39.1V: Clamped voltage during 10/1000μs surge - defines worst-case overvoltage seen by protected circuitry. |
| PPK | 1500W: Peak pulse power handling capacity under standardized 10/1000μs waveform. |
| IPP Max | 40A: Maximum non-repetitive peak surge current the device sustains without failure. |
| TJ Max | +175°C: Maximum junction temperature enabling use in under-hood automotive environments. |
| Response Time | <1.0ps: Time from 0V to VBR - critical for protecting fast-edge digital interfaces and microcontrollers. |
Pinout & Package
DO-201 axial package with cathode band marking; two-terminal device with anode and cathode leads. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; forms current sink during clamping. |
| Cathode | Protected line input | Connected to power rail or signal line being protected; marked with band for polarity identification. |
Key Features
| Feature | Design Value |
|---|---|
| Surge robustness | 1500W peak pulse power per 10/1000μs waveform - withstands high-energy load dump and inductive switching events. |
| Clamping precision | 39.1V clamping voltage at 40A ensures downstream 3.3V/5V/12V ICs remain below absolute maximum ratings during transients. |
| Leakage control | <1μA blocking leakage at 21.8V minimizes standby power loss and avoids false triggering in battery-powered systems. |
| Automotive compliance | AEC-Q101 qualification available (H-suffix variants) - validated for vibration, temperature cycling, and humidity reliability in vehicle ECUs. |
| Thermal stability | 0.096%/°C VBR tempco enables predictable clamping across -55°C to +175°C operating range. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 12V/24V supply lines in engine control units (ECUs) from ISO 7637-2 Pulse 2a (load dump) and Pulse 5a/b (alternator transients). IC Role / Device Role: Unidirectional TVS placed between battery rail and local regulator input to clamp surges before LDO or DC-DC stage. Use Value: Limits transient voltage to ≤39.1V, preventing damage to 40V-rated regulators and ensuring system reset integrity during cranking. | Use Scenario: Safeguarding digital input channels of programmable logic controllers against EFT (IEC 61000-4-4) and surge (IEC 61000-4-5) events in factory automation. IC Role / Device Role: Front-end transient suppressor on 24V sensor interface lines, mounted upstream of optocoupler or Schmitt trigger input. Use Value: Sub-1ps response captures fast EFT bursts; 21.8V VWM allows full 24V nominal operation while rejecting >39.1V spikes. |
| LED Driver Overvoltage Protection | Telecom Power Supply Clamp |
Use Scenario: Shielding constant-current LED driver ICs from inductive kickback when driving solenoids or relays on shared PCBs. IC Role / Device Role: Parallel-connected TVS across driver output to shunt inductive energy away from sensitive MOSFET gate drivers. Use Value: 1500W surge rating absorbs repetitive 8.3ms half-sine surges up to 200A IFSM, extending driver lifetime in harsh lighting controls. | Use Scenario: Clamping secondary-side 48V telecom power rails against lightning-induced surges entering via Ethernet or PoE interfaces. IC Role / Device Role: Secondary-side TVS on DC-DC output stage to limit overvoltage during AC-line surge coupling into isolated DC bus. Use Value: 39.1V clamping ensures 48V-rated load switches and PMICs remain within safe operating area during 1kV/0.5kA surge tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ24A | 600W rating, SMA package, 24V nominal, 38.9V clamping at 15.4A | Lower power handling; surface-mount only; not AEC-Q101 qualified | Select when board space is constrained and surge energy is ≤600W; requires re-layout for SMD placement. |
| ON Semiconductor 1.5KE27A | Same DO-201 package, tighter VBR tolerance (25.7–28.4V), identical 37.5V clamping at 42A | No functional difference; A-version offers improved parametric consistency for high-volume production | Choose 1.5KE27A for tighter VBR binning where precise clamping threshold is critical in safety-critical subsystems. |
Compared with SMAJ24A, the 1.5KE27C delivers 2.5× higher surge power and through-hole assembly compatibility; versus 1.5KE27A, it trades tighter VBR tolerance for broader availability and cost efficiency in non-safety-critical designs.
Availability
1.5KE27C is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC input conditioning, and LED driver overvoltage protection requiring stable component supply across multi-year production cycles.
Supply support for 1.5KE27C 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, specializing in power management, protection, and signal conditioning devices.
The 1.5KE series was developed specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure - emphasizing rugged DO-201 packaging, AEC-Q101 qualification paths, and ISO 7637-2 compliance out-of-the-box.
FAQ
What is the polarity configuration of the 1.5KE27C?
The 1.5KE27C is a unidirectional TVS diode with cathode band marking indicating the cathode terminal. It conducts only in reverse bias during overvoltage events and blocks forward current like a standard rectifier diode. This configuration makes it suitable for DC power rail protection where polarity is fixed, unlike bidirectional variants such as 1.5KE27CA which protect AC or reversible signal lines. The 1.5KE27C must be oriented with cathode toward the protected line and anode to ground.
Does the 1.5KE27C meet AEC-Q101 qualification?
The base 1.5KE27C part is not AEC-Q101 qualified; however, Taiwan Semiconductor offers the AEC-Q101-qualified variant 1.5KE27CH (H-suffix) in the same DO-201 package. The H-suffix version undergoes extended stress testing including temperature cycling, mechanical shock, and high-temperature reverse bias life testing per AEC-Q101 Rev D. For automotive applications requiring formal qualification, 1.5KE27CH is the designated replacement - the 1.5KE27C remains suitable for industrial and commercial designs where AEC-Q101 is not mandated.
What is the maximum clamping voltage of the 1.5KE27C and how is it measured?
The maximum clamping voltage of the 1.5KE27C is 39.1V, measured at a peak pulse current (IPP) of 40A using the standardized 10/1000μs double-exponential surge waveform per IEC 61000-4-5. This value represents the highest voltage the device allows across its terminals during a full-power transient event and is guaranteed across the full operating temperature range. It directly determines the upper voltage stress imposed on downstream components, making it a critical parameter for ensuring ICs with 40V absolute maximum ratings remain within safe limits during surge conditions.
How does the 1.5KE27C compare to the 1.5KE27A in terms of electrical performance?
The 1.5KE27A offers a tighter breakdown voltage range of 25.7–28.4V versus 24.3–29.7V for the 1.5KE27C, reflecting improved parametric binning during manufacturing. Both share identical clamping voltage (39.1V vs. 37.5V - note 1.5KE27A clamps at 37.5V @ 42A), package (DO-201), and surge rating (1500W). The 1.5KE27C provides broader VBR tolerance for cost-sensitive applications where exact clamping threshold is less critical, while the 1.5KE27A suits designs requiring tighter control of turn-on behavior - both parts are functionally interchangeable in most circuits, though layout and thermal design should verify current density at peak IPP.
Can the 1.5KE27C be used in bidirectional signal line protection?
No, the 1.5KE27C is strictly unidirectional and unsuitable for bidirectional signal line protection such as RS-485, CAN, or USB data lines. Its asymmetrical IV curve conducts only in reverse bias and blocks forward current, making it appropriate only for DC power rail or single-polarity signal protection. For bidirectional applications, Taiwan Semiconductor specifies the 1.5KE27CA variant - which uses a back-to-back diode configuration inside the same DO-201 package and exhibits symmetrical clamping in both polarities. Using 1.5KE27C on AC or reversible signals risks forward conduction, excessive leakage, or failure to suppress negative-going transients.
1.5KE27C 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 21.8V
- Voltage - Breakdown (Min):
- 24.3V
- Voltage - Clamping (Max) @ Ipp:
- 39.1V
- Current - Peak Pulse (10/1000µs):
- 40A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE27C FAQ
1.How can I place an order for 1.5KE27C through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE27C 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 1.5KE27C reliable?
The price and inventory of 1.5KE27C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE27C is usually 5 days.
3.What payment methods are accepted for 1.5KE27C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE27C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE27C?
1.5KE27C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE27C 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 1.5KE27C?
For technical support, including 1.5KE27C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE27C requirements.
6.How does Aetrix verify that 1.5KE27C is sourced from the original manufacturer or authorized distributors?
All 1.5KE27C 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 1.5KE27C meets industry standards.
7.What is the process for return or replacement of 1.5KE27C?
All 1.5KE27C units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE27C, 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 1.5KE27C part is unused and in its original packaging.
Return procedure for 1.5KE27C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE27C Tags
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