My Inquiry
My Account
Taiwan Semiconductor Corporation 1.5KE18
- Part No.:
- 1.5KE18
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE18.pdf
- Description:
- 1500W, 18V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,821
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5KE18 from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode with a nominal breakdown voltage of 18 V, minimum VBR of 16.2 V at 1.0 mA test current, maximum clamping voltage of 26.5 V at 59 A peak pulse current, and DO-201 axial package. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1.5KE18 datasheet, 1.5KE18 pinout, 1.5KE18 application, or 1.5KE18 equivalent, this TVS diode delivers verified 1500 W surge capability at 10/1000 µs, sub-1 ps response time for unidirectional operation, <1 µA leakage above 10 V, and AEC-Q101 qualification support for automotive-grade ESD and load-dump immunity design.
Technical Context
The 1.5KE18 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 16.2–19.8 V breakdown range. Its low dynamic impedance ensures rapid clamping to ≤26.5 V under 59 A transient current, limiting energy dissipation in protected ICs.
It complies with ISO 7637-2 for automotive electrical disturbances and meets JESD201 Class 2 whisker resistance. The device is rated for junction temperatures from –55 °C to +175 °C and uses pure tin-plated leads solderable per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 16.2 V min / 19.8 V max - defines reliable turn-on threshold for overvoltage detection |
| VWM | 14.5 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPP = 59 A | 26.5 V - clamped voltage during worst-case 10/1000 µs surge; determines protection margin for downstream ICs |
| PPK | 1500 W - peak pulse power handling at TA = 25 °C; derates linearly above ambient temperature |
| IPP | 59 A - maximum non-repetitive peak current it can shunt without failure |
| Junction Temp Range | –55 °C to +175 °C - enables use in under-hood automotive and high-temp industrial environments |
| Leakage @ VWM | <1 µA - negligible standby power loss and minimal impact on high-impedance sensing circuits |
Pinout & Package
Package: DO-201 axial leaded case with cathode band marking; RoHS-compliant, halogen-free molding compound; UL 94V-0 rated; weight ≈ 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side return path in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail); conducts avalanche current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W surge rating | Enables single-device protection against severe ISO 7637-2 load dump and inductive switching transients |
| Response time <1 ps | Clamps faster than most microcontrollers and CAN transceivers can be damaged by ESD or fast transients |
| AEC-Q101 qualified option | Validated for automotive reliability including temperature cycling, humidity bias, and mechanical shock |
| Low dynamic impedance | Minimizes clamping voltage overshoot during high-di/dt events, improving protection fidelity |
| DO-201 mechanical robustness | Supports manual and automated through-hole assembly; withstands 9.5 mm lead bending per JESD22-B117 |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to ISO 7637-2 Pulse 2b (load dump) and Pulse 1 (inductive spike). IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients before they reach PMICs or MCU power pins. Use Value: Limits rail voltage to ≤26.5 V during 59 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic supplies. | Use Scenario: 4–20 mA current loop transmitters interfacing with PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: TVS mounted across loop terminals to absorb EFT bursts (IEC 61000-4-4) and lightning-induced surges. Use Value: Sub-1 ps response ensures clamping occurs before sensitive op-amps or ADC front-ends experience overvoltage stress. |
| LED Driver Overvoltage Clamp | DC Motor Control Board Surge Suppression |
Use Scenario: Constant-current LED drivers in outdoor signage subjected to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Unidirectional 1.5KE18 placed across driver output to protect MOSFETs and current-sense resistors. Use Value: 1500 W rating handles multi-millisecond transients common in AC-coupled surge events without thermal runaway. | Use Scenario: H-bridge motor controllers driving brushed DC motors in robotics, experiencing back-EMF spikes during commutation. IC Role / Device Role / Timing Role: TVS connected from motor supply rail to ground to shunt inductive kickback energy. Use Value: Clamping at 26.5 V prevents MOSFET drain-source breakdown while maintaining safe SOA margins during repetitive switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Surface-mount SMB package; 600 W rating; VC = 29.2 V @ 20.9 A | Limited to lower-energy transients; unsuitable for full ISO 7637-2 Pulse 2b compliance without parallel staging | Select when board space is constrained and surge energy is ≤600 W |
| 1N6277A | Tighter VBR tolerance (17.1–18.9 V vs. 16.2–19.8 V); same DO-201 package and 1500 W rating | Identical mechanical and thermal behavior; preferred where tighter voltage control improves system margin | Choose for enhanced consistency in production batches requiring tighter VBR distribution |
Compared with SMBJ18A, the 1.5KE18 provides 2.5× higher surge power and lower clamping voltage for demanding automotive transients; compared with 1N6277A, it offers broader VBR tolerance but identical packaging and thermal performance-making it suitable for cost-sensitive designs where tighter binning isn't required.
Availability
1.5KE18 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED driver modules, and DC motor control systems requiring stable component supply and long-term obsolescence management.
Supply support for 1.5KE18 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and thyristors for automotive, industrial, and consumer markets.
The 1.5KE series was designed specifically for high-energy transient suppression in harsh environments-emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust DO-201 packaging for under-hood and factory-floor reliability.
FAQ
What is the maximum clamping voltage of the 1.5KE18 under standard test conditions?
The 1.5KE18 has a maximum clamping voltage (VC) of 26.5 V when subjected to a 10/1000 µs waveform peak impulse current (IPP) of 59 A. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events. The 1.5KE18 maintains this clamping performance across its specified junction temperature range, making it suitable for high-reliability power rail protection where voltage margin is critical.
Is the 1.5KE18 unidirectional or bidirectional, and how is polarity identified?
1.5KE18 is a unidirectional TVS diode, intended for DC rail protection where reverse polarity is not expected. Polarity is marked by a cathode band on the DO-201 package body; the banded end connects to the protected line (e.g., 12 V), while the anode connects to ground. Bidirectional variants (e.g., 1.5KE18CA) exist but are distinct part numbers-not interchangeable with 1.5KE18 without circuit redesign.
Does the 1.5KE18 meet AEC-Q101 reliability standards?
The base 1.5KE18 is not AEC-Q101 qualified; however, the variant 1.5KE18H (and 1N6277H) carries full AEC-Q101 certification. This includes stress testing for temperature cycling, high-temperature operating life, unbiased highly accelerated stress testing, and mechanical shock. For automotive applications requiring qualification evidence, specify 1.5KE18H-not 1.5KE18-to ensure compliance documentation and lot-level traceability.
What is the working stand-off voltage (VWM) of the 1.5KE18, and why does it matter?
The 1.5KE18 has a working stand-off voltage (VWM) of 14.5 V, meaning it remains in high-impedance blocking mode up to this reverse voltage. This value must exceed the system's maximum normal operating voltage (e.g., 13.5 V for a 12 V automotive rail) to prevent leakage-induced power loss or false triggering. Exceeding VWM risks premature conduction and thermal stress-so proper derating (e.g., ≥10 % margin) is essential in 1.5KE18 design-in.
Can the 1.5KE18 be used in place of the 1N6277 or 1N6277A?
Yes-the 1.5KE18 is the industry-standard JEDEC designation for the same device as 1N6277 (loose VBR tolerance) and 1N6277A (tighter VBR tolerance). All share identical DO-201 packaging, thermal ratings, and surge capability. The 1.5KE18 corresponds to the 1N6277 version; if tighter VBR control (17.1–18.9 V) is needed, select 1.5KE18A or 1N6277A instead of standard 1.5KE18.
1.5KE18 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):
- 14.5V
- Voltage - Breakdown (Min):
- 16.2V
- Voltage - Clamping (Max) @ Ipp:
- 26.5V
- Current - Peak Pulse (10/1000µs):
- 59A
- 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
1.5KE18 FAQ
1.How can I place an order for 1.5KE18 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE18 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 1.5KE18 reliable?
The price and inventory of 1.5KE18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE18 is usually 5 days.
3.What payment methods are accepted for 1.5KE18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE18?
1.5KE18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE18 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 1.5KE18?
For technical support, including 1.5KE18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE18 requirements.
6.How does Aetrix verify that 1.5KE18 is sourced from the original manufacturer or authorized distributors?
All 1.5KE18 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 1.5KE18 meets industry standards.
7.What is the process for return or replacement of 1.5KE18?
All 1.5KE18 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE18, 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 1.5KE18 part is unused and in its original packaging.
Return procedure for 1.5KE18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE18 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
