LA-301DB 7-Segment LED Display: Equivalent & Substitute Parts

Part Overview

The LA-301DB is a single-character 7-segment LED display module manufactured by Rohm Semiconductor. It features a 0.31-inch orange display with common anode configuration, designed for numeric and alphanumeric applications. The part is currently obsolete, making identification of compatible substitutes essential for ongoing production support and legacy system maintenance. Equivalent parts must maintain electrical compatibility across forward voltage, current requirements, and mechanical form factor specifications.

Substiute Parts

LA-301DB

Rohm SemiconductorIn Stock: 803LA-301DB Datasheet

Current PartRFQ

HDSP-U411

Broadcom LimitedIn Stock: 933HDSP-U411 Datasheet

DirectRFQ

HDSP-U401

Broadcom LimitedIn Stock: 763HDSP-U401 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LA-301DB is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Display type: 7-Segment
• Character configuration: Single character
• Digit size: 0.31" (8.00mm)
• Common pin type: Common Anode
• Color: Orange
• Forward voltage: 2V
• Package type: 10-DIP (0.209", 5.30mm)

Allowable Variation Parameters:

• Test current: 15mA to 20mA (within typical LED operating range)
• Peak wavelength: 600nm to 610nm (within orange spectrum)
• Millicandela rating: Variation acceptable within brightness tolerance
• Power dissipation: Variation acceptable with current specification changes
• Physical dimensions: Minor variations acceptable within DIP package standard

The substitute parts HDSP-U411 and HDSP-U401 (both Broadcom Limited) satisfy all mandatory compatibility criteria and fall within allowable variation ranges for electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

Both HDSP-U411 and HDSP-U401 are qualified substitutes for the obsolete LA-301DB based on electrical and mechanical compatibility. Selection between these two Broadcom alternatives should be based on the following factors:

Product Status: HDSP-U411 and HDSP-U401 are both active products with confirmed inventory availability, providing supply chain continuity for legacy system support.

Compliance Certifications: All three parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for existing applications.

Current Specification: The substitute parts operate at 20mA test current compared to the LA-301DB's 15mA specification. Circuit designs must accommodate this 5mA increase in current draw. The higher power dissipation (105mW vs. 40mW) reflects this increased current requirement and must be evaluated within the context of the complete circuit design.

Optical Characteristics: The substitute parts operate at 600nm peak wavelength (compared to 610nm for the LA-301DB) and deliver 5.39mcd brightness (compared to 6.3mcd). Both values remain within acceptable orange spectrum and brightness tolerance ranges for typical 7-segment display applications.

Mechanical Compatibility: Minor dimensional variations exist between the LA-301DB and substitute parts. The LA-301DB measures 0.275" H x 0.433" W, while HDSP-U411 and HDSP-U401 measure 0.433" H x 0.280" W. Both configurations maintain 10-DIP package standard and 0.197" depth, ensuring PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can HDSP-U411 and HDSP-U401 be used interchangeably with LA-301DB?

A: Both Broadcom parts meet the mandatory compatibility criteria for 7-segment display substitution: common anode configuration, 0.31-inch digit size, orange color, 2V forward voltage, and 10-DIP packaging. Electrical and mechanical compatibility is established. Selection between the two Broadcom alternatives depends on circuit current capacity and brightness requirements.

Q: What is the impact of the 5mA current increase from 15mA to 20mA?

A: The substitute parts require 20mA test current compared to the LA-301DB's 15mA specification. This represents a 33% increase in current draw per segment. Circuit designs must verify that current-limiting resistors and driver circuits can accommodate this higher current requirement without exceeding component ratings.

Q: Are there dimensional compatibility concerns?

A: The substitute parts have different height and width dimensions (0.433" H x 0.280" W vs. 0.275" H x 0.433" W for the original). However, both maintain the standard 10-DIP package footprint and 0.197" depth. PCB mounting compatibility is preserved. Physical clearance around the display should be verified in space-constrained applications.

Q: How do the optical characteristics compare?

A: The LA-301DB operates at 610nm peak wavelength with 6.3mcd brightness. The substitute parts operate at 600nm with 5.39mcd brightness. Both values remain within the orange spectrum and acceptable brightness range for standard 7-segment display applications. Visual appearance differences are minimal in typical operating conditions.

Q: What compliance certifications apply to these parts?

A: All three parts (LA-301DB, HDSP-U411, and HDSP-U401) are ROHS3 compliant and REACH unaffected. Regulatory requirements for existing applications are maintained with either substitute part.

Q: Why is the LA-301DB obsolete while the Broadcom alternatives are active?

A: Product lifecycle decisions are manufacturer-specific. The availability of active Broadcom alternatives ensures continued supply for legacy system support and new production requirements.