CSL0903UT1 Red LED 0603 SMD Equivalent & Substitute Parts

Part Overview

The CSL0903UT1 is a red surface mount LED manufactured by Rohm Semiconductor, designed for indication applications in 0603 (1608 Metric) package format. This discrete LED operates at 2.1V forward voltage with a dominant wavelength of 620nm and delivers 1200 millicandela brightness. The component is currently in active production status with 2769 units available in inventory.

Substitute parts are identified when components share identical electrical characteristics, mechanical dimensions, and packaging specifications while maintaining compatibility with the original design requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	CSL0903UT1
Manufacturer	Rohm Semiconductor
Product Category	LED Red Indication - Discrete
Color	Red
Wavelength - Dominant	620nm
Voltage - Forward (Vf) Typical	2.1V
Current - Test	20mA
Millicandela Rating	1200mcd
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Lens Style	Round with Domed Top
Lens Color	Colorless
Lens Transparency	Clear
Lens Size	1.14mm Dia
Size / Dimension	1.60mm L x 0.80mm W
Height (Max)	1.34mm
Packaging	Tape & Reel (TR)
Moisture Sensitivity Level (MSL)	3 (168 Hours)
Product Status	Active
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the CSL0903UT1 is determined by strict equivalence across the following critical parameters:

Electrical Characteristics:

Forward voltage (Vf): 2.1V typical
Test current: 20mA
Dominant wavelength: 620nm (red spectrum)
Luminous intensity: 1200mcd

Mechanical & Physical Specifications:

Package type: 0603 (1608 Metric)
Mounting method: Surface Mount
Lens configuration: Round with Domed Top, Colorless, Clear
Lens diameter: 1.14mm
Overall dimensions: 1.60mm L x 0.80mm W
Maximum height: 1.34mm

Environmental & Compliance:

Moisture Sensitivity Level: 3 (168 Hours)
Packaging format: Tape & Reel (TR)
REACH compliance status: REACH Unaffected

Parts meeting all these parameters are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Parameter	CSL0903UT1	CSL0903UT1C	Match Status
Manufacturer	Rohm Semiconductor	Rohm Semiconductor	Identical
Color	Red	Red	Identical
Wavelength - Dominant	620nm	620nm	Identical
Voltage - Forward (Vf) Typical	2.1V	2.1V	Identical
Current - Test	20mA	20mA	Identical
Millicandela Rating	1200mcd	1200mcd	Identical
Package / Case	0603 (1608 Metric)	0603 (1608 Metric)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Lens Style	Round with Domed Top	Round with Domed Top	Identical
Lens Color	Colorless	Colorless	Identical
Lens Transparency	Clear	Clear	Identical
Lens Size	1.14mm Dia	1.14mm Dia	Identical
Size / Dimension	1.60mm L x 0.80mm W	1.60mm L x 0.80mm W	Identical
Height (Max)	1.34mm	1.34mm	Identical
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Identical
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	Identical
Product Status	Active	Active	Identical
REACH Status	REACH Unaffected	REACH Unaffected	Identical
Grade	Standard	Automotive	Differs
Qualification	Not specified	AEC-Q102	Differs

Engineering Selection Recommendations

CSL0903UT1 (Standard Grade)

The CSL0903UT1 is suitable for general indication applications where standard industrial reliability requirements apply. This part carries active product status and is available in high inventory volume (2769 units). It meets REACH compliance requirements and is packaged in standard Tape & Reel format for automated assembly.

CSL0903UT1C (Automotive Grade)

The CSL0903UT1C is qualified to AEC-Q102 automotive standards and carries automotive-grade designation. All electrical and mechanical parameters remain identical to the standard version. This variant is specified for applications requiring automotive qualification compliance. Inventory availability is 2677 units.

Selection Basis:

For standard industrial and consumer applications: CSL0903UT1
For automotive applications requiring AEC-Q102 qualification: CSL0903UT1C
Both parts are functionally interchangeable in non-automotive contexts based on identical electrical and mechanical specifications
Automotive applications must use the AEC-Q102 qualified variant (CSL0903UT1C) to meet qualification requirements

Frequently Asked Questions (FAQ)

Q: Are CSL0903UT1 and CSL0903UT1C electrically identical?

A: Yes. Both parts share identical forward voltage (2.1V), test current (20mA), dominant wavelength (620nm), and luminous intensity (1200mcd) specifications.

Q: Can CSL0903UT1C be used as a substitute for CSL0903UT1 in standard applications?

A: Yes. The CSL0903UT1C is a direct parametric equivalent with identical electrical and mechanical characteristics. The automotive-grade qualification is an additional feature that does not restrict use in standard applications.

Q: Can CSL0903UT1 be used in automotive applications?

A: No. Automotive applications requiring AEC-Q102 qualification must use CSL0903UT1C. The standard CSL0903UT1 does not carry automotive qualification.

Q: Are the physical dimensions identical between both parts?

A: Yes. Both parts have identical package dimensions (0603/1608 Metric), size (1.60mm L x 0.80mm W), maximum height (1.34mm), and lens specifications (1.14mm diameter, round domed top, clear colorless).

Q: What is the difference between these two parts?

A: The primary difference is qualification level. CSL0903UT1C carries AEC-Q102 automotive qualification and automotive-grade designation. CSL0903UT1 is standard grade. All other specifications are identical.

Q: Are both parts available in Tape & Reel packaging?

A: Yes. Both CSL0903UT1 and CSL0903UT1C are supplied in Tape & Reel (TR) format suitable for automated pick-and-place assembly.

Q: What is the Moisture Sensitivity Level for these parts?

A: Both parts carry MSL 3 rating with a 168-hour floor life specification.

Q: Are these parts REACH compliant?

A: Yes. Both CSL0903UT1 and CSL0903UT1C are REACH Unaffected, indicating compliance with REACH regulations.

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