LDS-A5644RI 7-Segment LED Display Equivalent & Substitute Parts

Part Overview

The LDS-A5644RI is a single-character red 7-segment LED display manufactured by Lumex Opto/Components Inc. in a 10-DIP package. This common anode display operates at 2V forward voltage with a 10mA test current and provides 3.5mcd brightness at 635nm wavelength. The component is currently active in production and RoHS3 compliant.

Equivalent and substitute parts are necessary when the primary component becomes unavailable, when design requirements demand different electrical characteristics such as lower power consumption or higher brightness, or when alternative manufacturers' components offer superior performance metrics within the same mechanical package envelope.

Key Parameters

Parameter	Value
Display Type	7-Segment
Number of Characters	1
Common Pin Configuration	Common Anode
Color	Red
Digit/Alpha Size	0.56" (14.22mm)
Package Type	10-DIP (0.600", 15.24mm)
Voltage - Forward (Vf) Typical	2V
Current - Test	10mA
Millicandela Rating	3.5mcd
Wavelength - Peak	635nm
Power Dissipation (Max)	105mW
RoHS Status	RoHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the LDS-A5644RI is determined by strict adherence to the following parameters:

Mandatory Compatibility Parameters:

Display Type: 7-Segment (all substitutes must be 7-segment displays)
Number of Characters: 1 (single character only)
Common Pin Configuration: Common Anode (circuit topology requirement)
Package Type: 10-DIP (0.600", 15.24mm) (mechanical and pin compatibility)
Color: Red (optical specification)

Allowable Variation Parameters:

Digit/Alpha Size: 0.56" ±0.05" (minor dimensional tolerance within mechanical envelope)
Voltage - Forward (Vf): 1.7V to 2.0V (within typical LED forward voltage range for red devices)
Current - Test: 2mA to 20mA (design-dependent current selection)
Millicandela Rating: 0.40mcd to 34mcd (brightness selection based on application requirements)
Wavelength - Peak: 627nm to 660nm (red spectrum range)
Power Dissipation: 37mW to 320mW (dependent on current and voltage characteristics)

All substitute parts must maintain RoHS3 compliance and MSL Level 1 rating.

Parameter Comparison

Parameter	LDS-A5644RI (Lumex)	HDSP-H101 (Broadcom)	HDSP-H151 (Broadcom)	TDSL5150 (Vishay)	XDMR14A (SunLED)	XDUR14A (SunLED)
Display Type	7-Segment	7-Segment	7-Segment	7-Segment	7-Segment	7-Segment
Number of Characters	1	1	1	1	1	1
Common Pin	Common Anode	Common Anode	Common Anode	Common Anode	Common Anode	Common Anode
Color	Red	Red	Red	Red	Red	Red
Digit/Alpha Size	0.56" (14.22mm)	0.56" (14.22mm)	0.56" (14.22mm)	0.51" (13.00mm)	0.56" (14.22mm)	0.56" (14.22mm)
Package Type	10-DIP (0.600", 15.24mm)	10-DIP (0.600", 15.24mm)	10-DIP (0.600", 15.24mm)	10-DIP (0.600", 15.24mm)	10-DIP (0.600", 15.24mm)	10-DIP (0.600", 15.24mm)
Voltage - Forward (Vf) Typical	2V	1.7V	1.8V	1.8V	1.8V	1.9V
Current - Test	10mA	5mA	20mA	2mA	10mA	10mA
Millicandela Rating	3.5mcd	4.2mcd	16mcd	0.40mcd	34mcd	6.4mcd
Wavelength - Peak	635nm	645nm	645nm	635nm	660nm	627nm
Power Dissipation (Max)	105mW	37mW	96mW	320mW	75mW	75mW
RoHS Status	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Product Status	Active	Active	Active	Active	Obsolete	Active

Engineering Selection Recommendations

Primary Substitutes (Active Status):

HDSP-H101 (Broadcom Limited) is suitable for applications requiring reduced power consumption. This part operates at 1.7V with 5mA test current, resulting in 37mW maximum power dissipation compared to the LDS-A5644RI's 105mW. The HDSP-H101 maintains identical package dimensions and common anode configuration. Brightness output is comparable at 4.2mcd. This substitute is appropriate for battery-powered or power-constrained designs.

HDSP-H151 (Broadcom Limited) is suitable for applications requiring higher brightness output. This part delivers 16mcd at 20mA test current, providing approximately 4.6 times greater brightness than the LDS-A5644RI. Operating voltage is 1.8V with 96mW maximum power dissipation. This substitute is appropriate for applications requiring enhanced visibility in high ambient light conditions.

XDUR14A (SunLED) is suitable for general-purpose replacement applications. This part operates at 1.9V with 10mA test current, matching the LDS-A5644RI's current specification. Power dissipation is 75mW. Brightness output is 6.4mcd. The component maintains identical package dimensions and common anode configuration. This substitute is appropriate for direct replacement in existing designs.

Secondary Substitutes (Conditional Use):

TDSL5150 (Vishay Semiconductor Opto Division) exhibits a smaller digit size of 0.51" compared to the LDS-A5644RI's 0.56". This dimensional difference may affect visual appearance and readability in display applications. The part operates at 1.8V with 2mA test current and 0.40mcd brightness. This substitute is appropriate only when reduced brightness and lower current consumption are design requirements and the smaller digit size is acceptable.

XDMR14A (SunLED) carries an Obsolete product status. This part is not recommended for new designs. Existing inventory may be available, but long-term supply cannot be assured. The component operates at 1.8V with 10mA test current and delivers 34mcd brightness. Use of this part is restricted to legacy system maintenance only.

All substitute parts maintain RoHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the HDSP-H101 be used as a direct replacement for the LDS-A5644RI in existing circuit designs?

A: The HDSP-H101 is mechanically and electrically compatible as a substitute. Both parts are 10-DIP common anode 7-segment displays with identical package dimensions. The HDSP-H101 operates at lower voltage (1.7V vs. 2V) and lower current (5mA vs. 10mA), resulting in reduced power consumption. Circuit designs using current-limiting resistors will function with the HDSP-H101, though brightness will be slightly higher at 4.2mcd compared to 3.5mcd. No circuit modifications are required.

Q: What is the significance of the digit size difference between the LDS-A5644RI (0.56") and TDSL5150 (0.51")?

A: The digit size difference of 0.05" represents approximately 5% reduction in character height. This dimensional difference affects visual appearance and readability. The TDSL5150 will appear noticeably smaller in display applications. The 10-DIP package dimensions remain identical, so mechanical mounting compatibility is maintained. However, the smaller character size may impact user perception and readability in applications where display size is a design consideration.

Q: Why is the XDMR14A listed as Obsolete?

A: The XDMR14A carries an Obsolete product status designation, indicating that the manufacturer has discontinued active production and support. While inventory may remain available from distributors, long-term supply cannot be assured. New designs should not incorporate obsolete components. The XDMR14A is suitable only for maintenance and repair of existing systems where the specific part number is required for compatibility.

Q: How do forward voltage differences affect circuit design when substituting parts?

A: Forward voltage differences between substitute parts range from 1.7V (HDSP-H101) to 2.0V (LDS-A5644RI). In common anode configurations, the cathode of each segment connects through a current-limiting resistor to the driving circuit. The resistor value is calculated based on the desired segment current and the forward voltage drop. Lower forward voltage (HDSP-H101 at 1.7V) results in higher current through a fixed resistor value. Higher forward voltage (LDS-A5644RI at 2V) results in lower current. Designs using adjustable current-limiting resistors can accommodate forward voltage variations within the 1.7V to 2.0V range without functional degradation.

Q: What is the relationship between millicandela rating and brightness perception?

A: Millicandela (mcd) rating quantifies the luminous intensity of the display. Higher mcd values indicate greater brightness output. The LDS-A5644RI provides 3.5mcd, while the HDSP-H151 provides 16mcd (approximately 4.6 times brighter). The XDMR14A provides 34mcd (approximately 9.7 times brighter). Brightness perception is also affected by ambient light conditions, viewing angle, and human eye sensitivity. Applications in high ambient light environments benefit from higher mcd ratings. Applications in dark environments may require lower mcd ratings to prevent excessive brightness and potential eye strain.

Q: Are all substitute parts compatible with the same PCB footprint?

A: All substitute parts listed use the 10-DIP (0.600", 15.24mm) package type, which maintains identical pin spacing and overall package dimensions. PCB footprints designed for the LDS-A5644RI will accommodate all substitute parts without modification. Pin assignments for common anode 7-segment displays follow industry standard conventions, ensuring functional compatibility. Physical mounting and electrical connection are directly compatible across all listed substitutes.

Q: What compliance certifications are maintained across all substitute parts?

A: All substitute parts maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating. RoHS3 compliance ensures restriction of hazardous substances in accordance with EU Directive 2011/65/EU. MSL Level 1 rating indicates unlimited shelf life without moisture bake-out requirements, allowing standard storage and handling procedures. REACH status is Unaffected for all parts, indicating no restrictions under EU Regulation (EC) No 1907/2006. All parts carry EAR99 ECCN classification for export control purposes.

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