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Diodes Incorporated 1.5KE27A-T
- Part No.:
- 1.5KE27A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE27A-T.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:3,304
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Product details
Overview
1.5KE27A-T from Diodes Incorporated is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-201 package, designed for primary overvoltage protection of DC power rails and signal lines. It features a 23.1V reverse standoff voltage, 25.7V minimum breakdown voltage at 1mA test current, 37.5V maximum clamping voltage at 40A peak pulse current, and operates across –55°C to +175°C.
For engineers reviewing the 1.5KE27A-T datasheet, 1.5KE27A-T pinout, 1.5KE27A-T application, or 1.5KE27A-T equivalent, key selection criteria include clamping voltage margin relative to protected IC VMAX, peak pulse current capability under IEC 61000-4-5 surge waveforms, thermal derating above +25°C ambient, and axial lead solderability per MIL-STD-202 Method 208.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ns) and stable clamping performance under repetitive or single-event transients. Its unidirectional configuration provides low leakage (<5 µA at 23.1V) and precise forward conduction behavior during positive surges.
The device is rated for 1500W peak pulse power (tP = 1.0 ms, 10/1000 µs waveform), with steady-state power dissipation of 5.0W at 75°C lead temperature. Voltage temperature coefficient is +0.096%/°C, enabling predictable clamping shift across industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W - Sustains IEC 61000-4-5 Level 4 (4kV) surge without failure |
| Reverse Standoff Voltage (VRWM) | 23.1 V - Maximum continuous DC voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 25.7 V min @ 1 mA - Confirmed avalanche onset threshold for reliable triggering |
| Clamping Voltage (VC) | 37.5 V max @ 40 A - Limits downstream voltage stress during full-rated surge |
| Operating Temperature | –55°C to +175°C - Supports under-hood automotive and industrial power supply designs |
| Leakage Current (IR) | ≤5 µA @ 23.1 V - Minimizes standby power loss in always-on systems |
| Package | DO-201 - Axial-leaded, through-hole mountable with 1.12 g mass and UL 94V-0 epoxy |
Pinout & Package
1.5KE27A-T is housed in a DO-201 axial package with two terminals: anode and cathode. The cathode is marked by a band on the body. Leads are tin-plated, solderable per MIL-STD-202 Method 208, and spaced to accommodate standard PCB hole patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connects to ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Current exit point during forward conduction; high-impedance terminal during reverse bias | Connects to protected line; clamps to ~37.5 V when transient exceeds 25.7 V |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Ensures long-term reliability and stable VBR under humidity and thermal cycling |
| 1500W peak pulse rating | Provides robust protection against lightning-induced surges and inductive switching spikes |
| RoHS-compliant, halogen-free "Green" finish | Meets automotive and industrial environmental compliance requirements (Br+Cl <1500 ppm, Sb <1000 ppm) |
| Fast response time | Sub-nanosecond turn-on enables clamping before sensitive downstream ICs experience overstress |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24V DC input rails against load dump and alternator ripple transients. IC Role / Device Role: Primary overvoltage clamp placed upstream of DC-DC converters and microcontrollers. Use Value: Clamps 10/1000 µs surges to ≤37.5 V, preserving 3.3V/5V logic supply integrity and preventing latch-up in MCU I/O. | Use Scenario: Surge suppression on LIN bus lines and sensor supply inputs exposed to ESD and battery reversal events. IC Role / Device Role: Unidirectional TVS placed between LIN transceiver VCC pin and chassis ground. Use Value: Withstands ±30 kV contact ESD (IEC 61000-4-2) and limits induced transients to safe levels for ISO 17987-compliant transceivers. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Input-stage protection of PoE-powered equipment receiving up to 57V DC from midspan injectors. IC Role / Device Role: Standoff-rated TVS on PSE-side DC feed line to absorb inrush and cable discharge events. Use Value: 23.1V VRWM allows normal operation while clamping 1.5kW surges to 37.5V-well below 60V absolute maximum ratings of PoE interface ICs. | Use Scenario: DC-link protection in solar string inverters subjected to lightning-induced common-mode surges. IC Role / Device Role: Parallel-mounted TVS on PV input terminals to shunt energy before reaching MPPT controller and gate drivers. Use Value: 175°C max junction temperature supports operation in sealed outdoor enclosures; DO-201 mechanical robustness withstands vibration and thermal shock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Lower peak power (600W), smaller SMB package, 24V VRWM, 38.9V VC @ 15.4A | Suitable for space-constrained PCBs but insufficient for 4kV IEC 61000-4-5 Level 4 testing | Select when board area is critical and surge threat level is limited to IEC 61000-4-5 Level 2 (1kV). |
| 1.5KE27CA | Bidirectional version with identical VRWM, VBR, and VC; symmetrical clamping for AC or floating lines | Required for protection of differential buses (e.g., RS-485) or transformer-coupled interfaces where polarity is undefined | Choose when protecting bidirectional signals or AC-coupled paths; otherwise unidirectional 1.5KE27A-T offers lower leakage. |
Compared with SMBJ24A and 1.5KE27CA, the 1.5KE27A-T delivers higher surge handling (1500W vs. 600W) and axial-leaded mechanical stability for high-vibration environments, while its unidirectional architecture ensures minimal leakage in grounded DC systems-making it optimal for 24V industrial power rail protection.
Availability
1.5KE27A-T is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and renewable energy inverters requiring stable component supply across extended product lifecycles.
Supply support for 1.5KE27A-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability protection, power management, and signal integrity solutions for industrial, automotive, and computing markets.
The 1.5KE series is part of Diodes' transient voltage suppressor portfolio, engineered for robust overvoltage protection in harsh environments where long-term stability, high surge capacity, and wide temperature operation are mandatory.
FAQ
What is the difference between 1.5KE27A-T and 1.5KE27CA?
The 1.5KE27A-T is unidirectional, with cathode marking and asymmetric conduction: it clamps only positive transients relative to ground. The 1.5KE27CA is bidirectional, lacking a cathode band and clamping both polarities symmetrically. Both share identical 23.1V VRWM, 25.7V VBR, and 37.5V VC, but the CA version exhibits doubled leakage (≤10 µA) below 10V VR due to dual-junction construction.
Can 1.5KE27A-T be used in surface-mount designs?
No-1.5KE27A-T uses a DO-201 axial-leaded package intended for through-hole mounting. It cannot be directly substituted into SMT footprints. For surface-mount equivalents, consider SMAJ24A (400W) or SMCJ24A (1500W), which share similar electrical specs but use DO-214AB/SMC packages with gull-wing leads.
What is the maximum allowable surge repetition rate for 1.5KE27A-T?
The datasheet specifies non-repetitive operation: peak pulse power applies to single 1.0 ms pulses with ≤4 pulses per minute maximum duty cycle. Continuous or high-frequency surge exposure causes thermal accumulation beyond Pd = 5.0 W rating, risking parametric drift or catastrophic failure. Derating curves in DS21503 Rev. 12 must be applied for multi-pulse scenarios.
Does 1.5KE27A-T meet AEC-Q200 qualification?
No-the 1.5KE27A-T is not AEC-Q200 qualified. While Diodes offers AEC-Q200 versions in the same family (e.g., 1.5KE27A-Q), this specific part number is commercial-grade. Automotive designs requiring change control, PPAP, or IATF 16949 manufacturing must specify the -Q suffix and confirm qualification status via Diodes' automotive product definitions portal.
1.5KE27A-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE27A-T FAQ
1.How can I place an order for 1.5KE27A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE27A-T 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-T reliable?
The price and inventory of 1.5KE27A-T 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-T is usually 5 days.
3.What payment methods are accepted for 1.5KE27A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE27A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE27A-T?
1.5KE27A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE27A-T 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-T?
For technical support, including 1.5KE27A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE27A-T requirements.
6.How does Aetrix verify that 1.5KE27A-T is sourced from the original manufacturer or authorized distributors?
All 1.5KE27A-T 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-T meets industry standards.
7.What is the process for return or replacement of 1.5KE27A-T?
All 1.5KE27A-T units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE27A-T, 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-T part is unused and in its original packaging.
Return procedure for 1.5KE27A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE27A-T Tags
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ESD9B5.0ST5G
onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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