LDS-C305RI Equivalent & Substitute Parts

Part Overview

The LDS-C305RI is a single-character red 7-segment LED display module manufactured by Lumex Opto/Components Inc. This common cathode display operates at 2V forward voltage with a 10mA test current and features a 0.31-inch digit height. The device is housed in a 14-DIP package with 10 leads and is classified as Active product status with full RoHS3 compliance.

Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameters of the 7-segment LED display category. The HDSP-A103 from Broadcom Limited represents an alternative solution for applications where the specified electrical characteristics and physical dimensions are compatible with system requirements.

Key Parameters

Parameter	LDS-C305RI
Display Type	7-Segment
Number of Characters	1
Common Pin Configuration	Common Cathode
Color	Red
Digit/Alpha Size	0.31" (7.87mm)
Voltage - Forward (Vf) Typical	2V
Current - Test	10mA
Millicandela Rating	0.88mcd
Wavelength - Peak	700nm
Power Dissipation (Max)	120mW
Package / Case	14-DIP (0.300", 7.62mm), 10 Leads
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for 7-segment LED display modules is determined by the following critical parameters:

Common Functional Requirements:

Display Type: 7-Segment architecture
Number of Characters: Single character
Common Pin Configuration: Common Cathode topology
Color: Red wavelength range

Electrical Compatibility Criteria:

Voltage - Forward (Vf): Operating voltage must be compatible with circuit design
Current - Test: Test current specifications define operational envelope
Wavelength - Peak: Red spectrum wavelength (645nm to 700nm range)
Power Dissipation: Maximum power handling capability

Physical Compatibility Criteria:

Digit/Alpha Size: Display character height
Package / Case: DIP package format and pin count
Overall Dimensions: Physical footprint constraints

The HDSP-A103 qualifies as a substitute based on matching display type, single-character configuration, common cathode topology, and red color specification. Electrical parameters differ within acceptable ranges for the 7-segment LED display category.

Parameter Comparison

Parameter	LDS-C305RI	HDSP-A103	Compatibility Notes
Display Type	7-Segment	7-Segment	Identical
Number of Characters	1	1	Identical
Common Pin Configuration	Common Cathode	Common Cathode	Identical
Color	Red	Red	Identical
Digit/Alpha Size	0.31" (7.87mm)	0.30" (7.62mm)	Comparable within 0.25mm
Voltage - Forward (Vf) Typical	2V	1.7V	Lower voltage requirement
Current - Test	10mA	5mA	Lower current requirement
Millicandela Rating	0.88mcd	3.6mcd	Higher brightness
Wavelength - Peak	700nm	645nm	Both within red spectrum
Power Dissipation (Max)	120mW	37mW	Lower power consumption
Package / Case	14-DIP (0.300", 7.62mm), 10 Leads	10-DIP (0.200", 5.08mm)	Different package format
Product Status	Active	Active	Both actively manufactured
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical

Engineering Selection Recommendations

LDS-C305RI Selection Criteria:

Applications requiring 2V forward voltage operation
Systems designed for 10mA test current specifications
Designs utilizing 14-DIP package footprint with 10-lead configuration
Applications requiring 0.31-inch digit height display
700nm peak wavelength red spectrum requirement

HDSP-A103 Selection Criteria:

Applications compatible with 1.7V forward voltage operation
Systems designed for 5mA test current specifications
Designs utilizing 10-DIP package footprint
Applications requiring 0.30-inch digit height display
645nm peak wavelength red spectrum compatibility
Power-constrained applications benefiting from 37mW maximum dissipation

Both parts maintain Active product status and full RoHS3 compliance. Selection between these parts is determined by package format compatibility and electrical parameter requirements specific to the target application circuit design.

Frequently Asked Questions (FAQ)

Q: Can HDSP-A103 directly replace LDS-C305RI in existing PCB designs?

A: Direct PCB replacement is not possible due to different package formats. LDS-C305RI uses 14-DIP (0.300", 7.62mm) with 10 leads, while HDSP-A103 uses 10-DIP (0.200", 5.08mm). PCB layout and footprint modifications are required.

Q: What are the electrical differences between these parts?

A: LDS-C305RI operates at 2V forward voltage with 10mA test current and 0.88mcd brightness. HDSP-A103 operates at 1.7V forward voltage with 5mA test current and 3.6mcd brightness. Circuit design must accommodate these parameter differences.

Q: Are both parts suitable for new designs?

A: Both parts maintain Active product status. Selection depends on application requirements for voltage, current, brightness, package format, and digit size specifications.

Q: What is the significance of the wavelength difference?

A: LDS-C305RI operates at 700nm peak wavelength while HDSP-A103 operates at 645nm peak wavelength. Both are within the red spectrum range. Visual color appearance may differ slightly between parts.

Q: How do the package differences affect component selection?

A: Package format determines PCB footprint, pin spacing, and board layout requirements. 14-DIP and 10-DIP packages are not interchangeable without redesign. Verify package compatibility with target PCB design before selection.

Q: Are both parts RoHS compliant?

A: Both LDS-C305RI and HDSP-A103 are ROHS3 compliant with MSL rating of 1 (Unlimited), meeting current environmental and regulatory requirements.

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