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Microchip Technology CL2K4-G
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- Part No.:
- CL2K4-G
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
CL2K4-G.pdf
- Description:
- IC LED DRIVER LINEAR 20MA TO252
- Quantity:
- Payment:
- Shipping:
Inventory:3,146
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Product details
Overview
CL2K4-G from Microchip Technology is a high-voltage, temperature-compensated, two-terminal constant-current source IC designed for LED biasing and industrial indicator loads. It delivers 20 mA ±10% over 5.0–90 V input range, exhibits 0.01%/°C typical temperature coefficient, and operates across –40°C to +125°C junction temperature. Its TO-252 (D-PAK) package supports thermal dissipation up to 2.0 W at 25°C ambient.
For engineers reviewing the CL2K4-G datasheet, CL2K4-G pinout, CL2K4-G application, or CL2K4-G equivalent, this device serves as a robust, no-bias-resistor solution for stable current sourcing in signage, automotive lighting, and industrial status indicators where wide input voltage tolerance and minimal thermal drift are critical.
Technical Context
The CL2K4-G implements an integrated bandgap-referenced control circuit with on-chip temperature compensation to maintain regulation accuracy across its full operating voltage and temperature range. Its functional architecture enables direct two-terminal operation-either as a current source (VA to VB) or sink (VB to VA)-without external components beyond optional decoupling capacitance.
It features 300 kΩ typical dynamic resistance, enabling tight current regulation despite input voltage variation. The device supports parallel operation for scalable output current (e.g., 40 mA, 60 mA), and its absolute maximum rating of 100 V ensures margin against transients in industrial and automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 5.0–90 V - Supports direct connection to unregulated DC rails including 12 V, 24 V, and 48 V industrial buses plus automotive battery systems with load dump margin. |
| Output Current | 20 mA ±10% - Factory-trimmed precision current ideal for driving single or multiple standard LEDs without external resistors. |
| Temp. Coefficient | 0.01%/°C typical - Ensures ≤±1% current drift over –40°C to +100°C, critical for outdoor signage and under-hood automotive use. |
| Dynamic Resistance | 300 kΩ typical - High impedance maintains current stability across >85 V input swing; reduces sensitivity to supply ripple. |
| Junction Temp. Range | –40°C to +125°C - Rated for continuous operation in harsh environments including engine compartments and factory floors. |
| Thermal Resistance (θJA) | 81°C/W - TO-252 package enables 2.0 W power dissipation at 25°C ambient, supporting higher-power LED strings than TO-92 variants. |
Pinout & Package
CL2K4-G is housed in a 3-lead TO-252 (D-PAK) surface-mount package with exposed thermal pad for enhanced heat transfer. Pin 1 (VA) accepts input voltage; Pin 3 (NC) is internally unconnected and must be left floating; Pin 4 (VB) provides regulated current output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (VA) | Current Input Terminal | Connects to positive supply rail; internal circuit draws only leakage current until regulation engages above 5 V. |
| Pin 3 (NC) | No-Connect Terminal | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or thermal interference. |
| Pin 4 (VB) | Current Output Terminal | Sinks or sources 20 mA depending on external circuit polarity; forms return path for LED string or indicator load. |
Key Features
| Feature | Design Value |
|---|---|
| Two-terminal operation | Eliminates need for external bias resistors or control circuitry-reduces BOM count and layout area in space-constrained LED modules. |
| Wide 5–90 V operating range | Enables direct interface with legacy 12/24 V systems and modern 48 V architectures without pre-regulation, lowering system cost and complexity. |
| Parallelable design | Multiple CL2K4-G units can be connected in parallel to deliver 40 mA, 60 mA, or 80 mA while preserving regulation accuracy and thermal balance. |
| Temperature-compensated reference | Bandgap-derived regulation with 0.01%/°C drift ensures consistent LED brightness across ambient extremes without optical feedback loops. |
| Pb-free / RoHS-compliant | Meets global environmental compliance requirements; marked with "G" suffix and JEDEC e3 matte tin finish per packaging specification. |
Applications
| Automotive Interior Lighting | Industrial Panel Indicators |
|---|---|
|
Use Scenario: Illuminating dashboard icons, door handle LEDs, and center console status lights in 12 V/24 V vehicle electrical systems. IC Role / Device Role / Timing Role: Constant-current sink regulating 20 mA through each LED segment independent of battery voltage fluctuations (9–16 V). Use Value: Prevents LED overcurrent during cold-crank (low voltage) and load-dump (high voltage) events, extending lifespan and ensuring consistent luminance. |
Use Scenario: Driving status LEDs on PLC I/O modules, HMI panels, and safety-rated control cabinets operating from 24 V DC industrial supplies. IC Role / Device Role / Timing Role: Two-terminal current source providing stable 20 mA drive regardless of supply ripple or long cable drops. Use Value: Eliminates resistor recalibration during field maintenance and ensures reliable visual indication across varying line conditions. |
| Architectural Signage | Commercial Accent Lighting |
|
Use Scenario: Powering monochrome LED arrays in channel letters, backlit logos, and façade lighting powered by 48 V PoE++ or centralized DC distribution. IC Role / Device Role / Timing Role: High-voltage constant-current source enabling series-connected LEDs without individual current-limiting resistors. Use Value: Reduces component count and improves system efficiency versus linear regulator-based solutions, especially at 48 V input. |
Use Scenario: Driving low-profile LED strips in retail displays, museum exhibits, and hospitality environments requiring uniform illumination at 24 V or 36 V. IC Role / Device Role / Timing Role: Temperature-stable current sink maintaining consistent LED color point and lumen output across seasonal ambient shifts. Use Value: Avoids visible brightness variation between fixtures installed in varying thermal zones (e.g., near HVAC vents vs. enclosed cabinets). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current source applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSI45020AZT1G | 20 mA ±5%, 45 V max operating voltage, SOD-123FL package, 120°C max Tj | Limited to lower-voltage applications (<45 V); unsuitable for 48 V signage or automotive load-dump scenarios | Select when tighter initial tolerance is required and input voltage remains below 45 V; smaller footprint but lower thermal capability. |
| Diodes Incorporated AL5809-20 | 20 mA ±3%, 60 V max operating voltage, SOT-223 package, 125°C max Tj, requires external resistor for current setting | Needs external resistor for regulation; adds BOM cost and calibration step; not truly two-terminal | Choose when higher initial accuracy justifies added component count and layout area; not drop-in compatible with CL2K4-G. |
Compared with NSI45020AZT1G and AL5809-20, the CL2K4-G uniquely combines 90 V operation, true two-terminal simplicity, and industry-leading thermal stability in a thermally enhanced D-PAK package-making it optimal for high-reliability, wide-input industrial and automotive LED biasing where layout simplicity and voltage margin are prioritized over sub-5% initial tolerance.
Availability
CL2K4-G is available at Aetrix Electronics and suitable for automotive interior lighting, industrial panel indicators, and architectural signage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CL2K4-G 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
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with ISO/TS-16949 certified manufacturing and global technical support infrastructure.
The CL2 family was developed specifically for robust, resistorless constant-current LED biasing in harsh environments-targeting automotive, industrial, and commercial lighting where reliability, thermal stability, and wide input voltage tolerance are essential.
FAQ
What is the maximum input voltage the CL2K4-G can withstand?
The CL2K4-G has an absolute maximum operating voltage (VA-B) rating of 100 V, with guaranteed regulation from 5.0 V to 90 V. This 10 V margin accommodates transient spikes common in automotive and industrial power systems. Operation above 90 V is outside the specified regulation range, though the device remains undamaged up to 100 V per absolute maximum ratings.
Can the CL2K4-G be used as both a current source and a current sink?
Yes-the CL2K4-G functions as either a constant-current source or sink depending on external circuit configuration. When VA is connected to the positive supply and VB to the LED anode, it acts as a source; reversing polarity (VB to supply, VA to LED cathode) configures it as a sink. Both modes deliver 20 mA ±10% with identical regulation performance.
Does the CL2K4-G require any external components to operate?
No external components are required for basic operation. A 100 nF ceramic capacitor between VA and VB is recommended in noisy environments to suppress high-frequency transients, but the CL2K4-G regulates 20 mA autonomously across its 5–90 V range without resistors, capacitors, or control signals-enabling true two-terminal simplicity.
How does temperature affect the output current of the CL2K4-G?
The CL2K4-G exhibits a typical temperature coefficient of 0.01%/°C over –40°C to +100°C, meaning current drift remains within ±1% across that full range. This is achieved via on-chip temperature compensation circuitry, making it significantly more stable than resistor-based current sources, especially in uncontrolled ambient environments like outdoor signage enclosures.
Is the CL2K4-G pin-compatible with other variants in the CL2 family?
No-the CL2K4-G uses the TO-252 (D-PAK) package with a unique 3-pin layout (Pin 1: VA, Pin 3: NC, Pin 4: VB), whereas CL2N3-G (TO-92) and CL2N8-G (SOT-89) have different pinouts and thermal profiles. While functionally identical, mechanical replacement requires PCB redesign due to differing land patterns, thermal pad requirements, and terminal assignments.
CL2K4-G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Constant Current
- Internal Switch(s):
- -
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 90V
- Voltage - Output:
- 90V
- Current - Output / Channel:
- 20mA
- Frequency:
- -
- Dimming:
- -
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-252 (DPAK)
CL2K4-G FAQ
1.How can I place an order for CL2K4-G through Aetrix?
Please submit a Request for Quotation (RFQ) for CL2K4-G 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 CL2K4-G reliable?
The price and inventory of CL2K4-G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CL2K4-G is usually 5 days.
3.What payment methods are accepted for CL2K4-G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CL2K4-G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CL2K4-G?
CL2K4-G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CL2K4-G 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 CL2K4-G?
For technical support, including CL2K4-G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CL2K4-G requirements.
6.How does Aetrix verify that CL2K4-G is sourced from the original manufacturer or authorized distributors?
All CL2K4-G 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 CL2K4-G meets industry standards.
7.What is the process for return or replacement of CL2K4-G?
All CL2K4-G units undergo pre-shipment inspection (PSI). If there is an issue with CL2K4-G, 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 CL2K4-G part is unused and in its original packaging.
Return procedure for CL2K4-G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CL2K4-G Tags
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