HDSP-501B 7-Segment LED Display - Equivalent & Substitute Parts

Part Overview

The HDSP-501B is a single-character, 7-segment LED display module manufactured by Broadcom Limited. It features a 0.56-inch blue digit with common anode configuration, designed for numeric display applications. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The display operates at 3.8V forward voltage with a 20mA test current and delivers 3.4 millicandela brightness output.

Substiute Parts

HDSP-501B

Broadcom LimitedIn Stock: 809HDSP-501B Datasheet

Current PartRFQ

LA-601BB

Rohm SemiconductorIn Stock: 975LA-601BB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HDSP-501B is determined by the following critical parameters:

Primary Compatibility Criteria:

• Display type: 7-Segment configuration
• Character count: Single character
• Common pin configuration: Common Anode
• Color: Blue
• Package type: 10-DIP form factor
• Digit size: Approximately 0.56" range

Electrical Operating Parameters:

• Forward voltage (Vf): 3.6V to 3.8V range
• Test current: 10mA to 20mA range
• Brightness output: Millicandela rating suitable for display applications

The LA-601BB from Rohm Semiconductor meets these substitution criteria. It maintains the same 7-segment, single-character, common-anode architecture in a 10-DIP package with comparable digit size (0.58"), operating voltage (3.6V), and current specifications (10mA). Physical dimensions remain within acceptable tolerance for PCB mounting compatibility.

Parameter Comparison

Engineering Selection Recommendations

The HDSP-501B is classified as obsolete, necessitating component substitution for new production and field replacements. The LA-601BB serves as the manufacturer-recommended equivalent substitute.

Selection Basis:

The LA-601BB maintains functional and mechanical compatibility with the HDSP-501B through identical 7-segment, single-character, common-anode architecture and 10-DIP package configuration. Both parts carry MSL Level 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status, ensuring equivalent environmental compliance.

The LA-601BB operates at a lower forward voltage (3.6V versus 3.8V) and reduced test current (10mA versus 20mA), resulting in lower power dissipation (42mW versus 135mW). This represents improved efficiency characteristics. The substitute part delivers higher brightness output (56mcd versus 3.4mcd) with a peak wavelength shift from 428nm to 470nm, producing a slightly different blue hue perception.

The LA-601BB is classified as "Not For New Designs" by Rohm Semiconductor, indicating limited long-term availability. For applications requiring extended component lifecycle support, alternative sourcing strategies should be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the LA-601BB directly replace the HDSP-501B in existing PCB designs?

A: The LA-601BB is mechanically and functionally compatible with the HDSP-501B. Both parts use 10-DIP package configuration with identical pin spacing and common-anode wiring. Physical dimensions are within acceptable tolerance (height difference of 0.4mm). Direct PCB substitution is feasible without layout modifications.

Q: What are the electrical differences between these parts?

A: The LA-601BB operates at 3.6V forward voltage compared to the HDSP-501B's 3.8V, and draws 10mA test current versus 20mA. The substitute part exhibits lower power dissipation (42mW versus 135mW). Peak wavelength differs (470nm versus 428nm), resulting in a slightly different blue color appearance. Circuit designs must accommodate these electrical parameter variations through appropriate current-limiting resistor selection.

Q: Are there packaging or moisture sensitivity differences?

A: Both parts carry identical Moisture Sensitivity Level 1 (Unlimited) ratings and REACH Unaffected compliance status. Package type is 10-DIP for both parts, though the DIP pitch differs slightly (0.400" for LA-601BB versus 0.600" for HDSP-501B). This pitch difference does not affect PCB compatibility for standard 0.6-inch DIP footprints.

Q: What is the brightness difference between these displays?

A: The LA-601BB delivers 56 millicandela output compared to the HDSP-501B's 3.4 millicandela. This represents significantly higher brightness. Applications sensitive to display intensity may require circuit-level brightness adjustment through modified current-limiting resistor values.

Q: Why is the LA-601BB marked "Not For New Designs"?

A: This designation indicates the part is in end-of-life phase with limited future availability from the manufacturer. While suitable for substitution in existing applications, long-term sourcing may become constrained. For new product development, evaluation of alternative 7-segment display solutions with active production status is recommended.