My Inquiry
My Account
STMicroelectronics 1.5KE18CARL
- Part No.:
- 1.5KE18CARL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-201AA, DO-27, Axial
- Datasheet:
-
1.5KE18CARL.pdf
- Description:
- TVS DIODE 15.3VWM 32.5VC DO201
- Quantity:
- Payment:
- Shipping:
Inventory:8,846
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5KE18CARL from STMicroelectronics is a unidirectional 1500 W transient voltage suppression diode in DO-201 package, with 18 V breakdown voltage (VBR = 17.1–18.9 V at IBR = 1 mA), 25.2 V clamping voltage (VCL) at 59.5 A peak pulse current, and 1 µA max reverse leakage at 14.4 V. It operates from –55 °C to +175 °C and is used for IEC 61000-4-2 ESD and IEC 61000-4-4 surge protection in AC/DC power inputs of industrial SMPS.
For engineers reviewing the 1.5KE18CARL datasheet, 1.5KE18CARL pinout, 1.5KE18CARL application, or 1.5KE18CARL equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, junction temperature derating above 25 °C, DO-201 thermal pad layout compatibility, and bidirectional/unidirectional polarity matching to circuit grounding topology.
Technical Context
This TVS diode uses planar junction silicon technology optimized for low leakage (<1 µA at VRM) and high junction temperature stability (Tj up to +175 °C), enabling reliable operation in thermally constrained power supply rails. Its dynamic resistance (RD = 0.106 Ω) and fast response (<1 ns) ensure predictable clamping during 8/20 µs surges up to 308 A.
The device complies with IEC 61000-4-2 (±30 kV air/contact discharge) and IEC 61000-4-4 level 4 (4 kV), meeting UL 497B and J-STD-020 MSL level 1 requirements. Its DO-201 package supports manual and reflow soldering per JEDEC profile with 260 °C max lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 1500 W - sustains single-line surges without degradation in telecom or industrial AC input stages |
| Breakdown Voltage VBR | 17.1–18.9 V at 1 mA - defines minimum overvoltage threshold before conduction begins |
| Clamping Voltage VCL | 25.2 V at 59.5 A - limits downstream voltage stress to safe levels for 24 V-rated controllers |
| Reverse Leakage IRM | 1 µA max at 14.4 V - ensures negligible standby power loss in always-on systems |
| Junction Temperature Range | –55 °C to +175 °C - enables deployment in under-hood automotive or high-ambient industrial enclosures |
| Package | DO-201 - axial-leaded through-hole package with 8.5–9.5 mm body length and 0.96–1.06 mm lead diameter |
Pinout & Package
1.5KE18CARL is a two-terminal unidirectional TVS diode in DO-201 package. The cathode is marked by a band on the body; anode is unmarked. Leads are matte tin-plated for solderability and whisker resistance (JESD-201 Class 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or common return path; conducts surge current to reference plane |
| Cathode | High-side connection point | Connected to protected line (e.g., AC L/N or DC bus); blocks normal operating voltage until VBR exceeded |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD robustness | ±30 kV contact/air discharge - eliminates need for external ESD diodes in front-end protection |
| Thermal stability at Tj = 175 °C | 1100 W peak pulse power retained - maintains clamping performance in high-temp power supplies |
| Low dynamic resistance | RD = 0.106 Ω - minimizes VCL rise under high-current transients |
| UL 497B certification | File QVGQ2.E136224 - validates suitability for primary-side telecom and industrial surge protection |
Applications
| AC/DC Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller exposed to inductive switching transients and field wiring ESD. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp positive-going surges before they reach the input regulator and microcontroller. Use Value: Clamps 59.5 A surge to ≤25.2 V, protecting 30 V-rated LDOs and isolators without derating or parallel devices. |
Use Scenario: 24 V digital input channel connected to external sensors via long cables in factory automation environments. IC Role / Device Role / Timing Role: Frontline transient suppressor on each input line, mounted adjacent to connector to minimize loop inductance. Use Value: Withstands repeated 4 kV IEC 61000-4-4 bursts while maintaining <1 µA leakage, ensuring stable logic thresholds over 10+ year service life. |
| Telecom Line Interface Protection | SMPS Secondary-Side Overvoltage Clamp |
Use Scenario: Low-voltage DC feed line (–48 V) in telecom remote radio units subject to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional variant (1.5KE18CA) used across differential pair; unidirectional 1.5KE18CARL applied to single-ended bias rail. Use Value: Delivers 308 A surge handling at 8/20 µs with <0.11 Ω RD, limiting voltage overshoot to <32.5 V during worst-case events. |
Use Scenario: Output rectifier node in flyback converter where secondary-side overvoltage must be limited to protect optocoupler and feedback IC. IC Role / Device Role / Timing Role: Parallel-connected TVS across output capacitor to absorb energy from transformer leakage inductance spikes. Use Value: 1500 W rating allows single-device clamping without thermal runaway, even at full-load 85 °C ambient with no airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | 600 W rating (vs. 1500 W), DO-214AA package, 28.2 V VCL at 21.2 A | Limited to lower-energy surges; unsuitable for 4 kV IEC 61000-4-4 level 4 | Select only when space-constrained PCB layout prevents DO-201 placement and surge threat is ≤1 kV |
| 1N6267A | Same 1500 W rating and DO-201 package, but VBR = 16.2–17.9 V, VCL = 24.4 V at 61.5 A | Narrower VBR tolerance and slightly lower clamping - tighter margin for 24 V systems | Prefer when tighter VBR distribution is required and ST sourcing is unavailable |
Compared with SMBJ18A and 1N6267A, 1.5KE18CARL offers superior surge energy handling and higher temperature resilience, making it the preferred choice for industrial-grade AC/DC front ends where reliability under sustained thermal stress is critical.
Availability
1.5KE18CARL is available at Aetrix Electronics and suitable for AC/DC power input protection, industrial PLC digital I/O protection, and telecom line interface protection requiring stable component supply and long-term lifecycle continuity.
Supply support for 1.5KE18CARL 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
1.5KE18CARL belongs to ST's 1.5KE series of high-power TVS diodes, engineered specifically for robust, high-temperature surge protection in mission-critical power conversion and signal interface applications.
FAQ
What is the difference between 1.5KE18A and 1.5KE18CARL?
1.5KE18A is unidirectional (anode-cathode polarity), while 1.5KE18CA is bidirectional (symmetrical clamping). The "RL" suffix indicates tape-and-reel packaging (1900 pcs/reel); both share identical electrical specs and DO-201 package. 1.5KE18CARL is the bidirectional version in reel format - confirmed by ST's DS0636 Rev 5 ordering table and marking convention.
Can 1.5KE18CARL replace a 20 V Zener diode in overvoltage protection?
No - Zener diodes regulate voltage continuously and lack surge-handling capability. 1.5KE18CARL is a transient suppressor that remains high-impedance below VBR and clamps only during surges. Its 17.1–18.9 V VBR and 25.2 V VCL make it unsuitable as a precision voltage reference but ideal for protecting 24 V systems from fast transients.
Is 1.5KE18CARL RoHS and REACH compliant?
Yes - STMicroelectronics certifies all 1.5KE devices as RoHS-compliant (Pb-free, halogen-free) and REACH-conformant per ECOPACK2 specifications. The matte tin lead finish meets J-STD-002 and JESD 22-B102 E3 standards, and the device carries ST's ECOPACK2 environmental grade marking.
How does junction temperature affect clamping voltage?
VCL increases linearly with junction temperature: VCL(Tj) = VCL(25 °C) × [1 + αT × (Tj − 25)], where αT = 8.8 × 10−4/°C for 1.5KE18CARL. At 150 °C, VCL rises ~11% - from 25.2 V to ~28.0 V - requiring design margin verification per IEC 61000-4-4 test conditions.
1.5KE18CARL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-201AA, DO-27, Axial
- Series:
- 1.5KE, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 32.5V
- Current - Peak Pulse (10/1000µs):
- 308A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 2150pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-201
1.5KE18CARL FAQ
1.How can I place an order for 1.5KE18CARL through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5KE18CARL 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 1.5KE18CARL reliable?
The price and inventory of 1.5KE18CARL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5KE18CARL is usually 5 days.
3.What payment methods are accepted for 1.5KE18CARL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5KE18CARL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5KE18CARL?
1.5KE18CARL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5KE18CARL 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 1.5KE18CARL?
For technical support, including 1.5KE18CARL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5KE18CARL requirements.
6.How does Aetrix verify that 1.5KE18CARL is sourced from the original manufacturer or authorized distributors?
All 1.5KE18CARL 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 1.5KE18CARL meets industry standards.
7.What is the process for return or replacement of 1.5KE18CARL?
All 1.5KE18CARL units undergo pre-shipment inspection (PSI). If there is an issue with 1.5KE18CARL, 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 1.5KE18CARL part is unused and in its original packaging.
Return procedure for 1.5KE18CARL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5KE18CARL 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
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…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
