LDS-C5644RI 7-Segment LED Display Equivalent & Substitute Parts

Part Overview

The LDS-C5644RI is a single-character, 0.56-inch red 7-segment LED display module manufactured by Lumex Opto/Components Inc. This common cathode display is designed for numeric and alphanumeric applications requiring compact form factor and standard DIP packaging. The part is currently active in production with 682 units in stock. Equivalent and substitute parts are identified based on matching display type, character size, package configuration, and common cathode architecture to ensure direct functional replacement in circuit designs.

Substiute Parts

LDS-C5644RI

Lumex Opto/Components Inc.In Stock: 707LDS-C5644RI Datasheet

Current PartRFQ

HDSP-515A

Broadcom LimitedIn Stock: 6272HDSP-515A Datasheet

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HDSP-H103

Broadcom LimitedIn Stock: 2171HDSP-H103 Datasheet

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HDSP-H153

Broadcom LimitedIn Stock: 2175HDSP-H153 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LDS-C5644RI are qualified based on the following criteria:

Primary Matching Parameters:

• Display Type: 7-Segment (all substitutes match)
• Number of Characters: 1 (all substitutes match)
• Digit/Alpha Size: 0.56" (14.22mm) (all substitutes match)
• Common Pin Configuration: Common Cathode (all substitutes match)
• Color: Red (all substitutes match)
• Package / Case: 10-DIP (0.600", 15.24mm) (all substitutes match)

Secondary Electrical Parameters (Variable): Substitute parts differ in forward voltage (Vf), test current, millicandela rating, wavelength peak, and power dissipation. These variations allow selection based on specific circuit requirements while maintaining functional compatibility through the common cathode architecture and standard DIP pinout.

Compliance Parameters: All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing and storage requirements.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance and MSL 1 rating, confirming suitability for current manufacturing environments and long-term storage without moisture sensitivity constraints.

HDSP-515A (Broadcom Limited): This substitute operates at 1.85V forward voltage with 20mA test current and delivers 6.5mcd brightness. Power dissipation is 30mW maximum. The 660nm wavelength peak produces a slightly longer-wavelength red emission compared to the LDS-C5644RI. This part is suitable for applications requiring lower forward voltage operation and higher brightness output within a higher current budget.

HDSP-H103 (Broadcom Limited): This substitute operates at 1.7V forward voltage with 5mA test current and delivers 4.2mcd brightness. Power dissipation is 37mW maximum. The 645nm wavelength peak is intermediate between the LDS-C5644RI and HDSP-515A. This part is suitable for low-power applications with minimal current draw requirements while maintaining comparable brightness levels.

HDSP-H153 (Broadcom Limited): This substitute operates at 1.8V forward voltage with 20mA test current and delivers 16mcd brightness. Power dissipation is 96mW maximum. The 645nm wavelength peak matches HDSP-H103. This part is suitable for applications requiring significantly higher brightness output and is part of the HDSP-H15x series. The higher millicandela rating accommodates visibility requirements in high-ambient-light environments.

All substitutes maintain the 10-DIP package configuration and common cathode pinout, ensuring direct PCB compatibility without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can HDSP-515A, HDSP-H103, and HDSP-H153 be used interchangeably with LDS-C5644RI in the same circuit?

A: Direct pin-for-pin substitution is possible due to matching 10-DIP common cathode package configuration. However, circuit performance will vary based on differences in forward voltage, test current, and brightness output. Current-limiting resistor values may require adjustment to accommodate the different forward voltage specifications and desired brightness levels.

Q: What are the key electrical differences between the substitute parts?

A: HDSP-515A operates at 1.85V with 20mA test current and 6.5mcd brightness. HDSP-H103 operates at 1.7V with 5mA test current and 4.2mcd brightness. HDSP-H153 operates at 1.8V with 20mA test current and 16mcd brightness. The LDS-C5644RI operates at 2V with 10mA test current and 3.9mcd brightness. Selection depends on power budget, brightness requirements, and forward voltage compatibility with the driving circuit.

Q: Are all parts physically identical?

A: LDS-C5644RI and HDSP-515A share identical physical dimensions of 0.673" H x 0.488" W x 0.315" D. HDSP-H103 and HDSP-H153 have slightly different dimensions of 0.670" H x 0.495" W x 0.315" D. These minor variations (approximately 0.003" difference in height and width) are within typical PCB mounting tolerances for standard DIP sockets.

Q: Which substitute offers the lowest power consumption?

A: HDSP-515A offers the lowest maximum power dissipation at 30mW, followed by HDSP-H103 at 37mW. The LDS-C5644RI specifies 105mW maximum power dissipation, and HDSP-H153 specifies 96mW maximum power dissipation.

Q: What is the significance of the wavelength peak differences?

A: Wavelength peak values (635nm for LDS-C5644RI, 660nm for HDSP-515A, 645nm for HDSP-H103 and HDSP-H153) indicate the dominant color emission within the red spectrum. These differences may be perceptible in applications where color consistency is critical, such as indicator panels or display arrays requiring uniform appearance.

Q: Are all parts RoHS compliant?

A: Yes, all parts listed are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, confirming compatibility with modern manufacturing processes and unrestricted storage conditions.