HDSP-N105 Equivalent & Substitute Parts

Part Overview

The HDSP-N105 is a 7-segment LED display module manufactured by Broadcom Limited, featuring a single red character with 0.80" digit height in a 18-DIP package configuration. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The display operates as a common cathode device with 1.7V forward voltage and 5mA test current, suitable for numeric and alphanumeric display applications requiring compact form factors.

Substiute Parts

HDSP-N105

Broadcom LimitedIn Stock: 1591HDSP-N105 Datasheet

Current PartRFQ

SC08-12SRWA

KingbrightIn Stock: 1094SC08-12SRWA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HDSP-N105 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Display type: 7-Segment configuration
• Character count: Single character
• Digit height: 0.80" (20.32mm)
• Color: Red
• Common pin type: Common Cathode
• Package type: DIP configuration with 0.600" (15.24mm) pitch

Electrical Operating Range:

• Forward voltage tolerance: Vf within acceptable circuit design margins
• Test current: Operating current compatible with standard driver circuits
• Wavelength: Red spectrum (640-660nm range)

Compliance Requirements:

• RoHS3 compliance mandatory
• Moisture sensitivity level: MSL 1 (Unlimited)

The SC08-12SRWA from Kingbright meets these primary criteria while maintaining functional equivalence for 7-segment display applications. Differences in package pin count (16-DIP vs. 18-DIP) and electrical specifications (1.85V vs. 1.7V, 20mA vs. 5mA) require circuit-level evaluation but do not preclude substitution in applications where the display module is the functional element.

Parameter Comparison

Engineering Selection Recommendations

The SC08-12SRWA serves as an active substitute for the obsolete HDSP-N105. Both components maintain ROHS3 compliance and MSL 1 moisture sensitivity ratings, ensuring regulatory and environmental compatibility.

The primary design consideration is the package transition from 18-DIP to 16-DIP configuration. This requires PCB layout modification and potential rewiring of the display interface. The reduced pin count in the SC08-12SRWA reflects modern manufacturing standards while maintaining the same 0.600" pitch spacing.

Electrical parameter differences—specifically the 0.15V increase in forward voltage (1.7V to 1.85V) and 4x increase in test current (5mA to 20mA)—necessitate driver circuit adjustment. The SC08-12SRWA exhibits higher luminous intensity (36mcd vs. 4.6mcd), providing improved visibility in applications with ambient light exposure. Power dissipation increases from 37mW to 75mW maximum, requiring thermal margin verification in space-constrained designs.

Both components are red 7-segment displays with common cathode configuration and 0.80" character height, maintaining functional equivalence for numeric and alphanumeric display applications.

Frequently Asked Questions (FAQ)

Q: Can the SC08-12SRWA directly replace the HDSP-N105 without PCB modification?

A: No. The package change from 18-DIP to 16-DIP requires PCB layout modification. Pin assignments differ between the two devices, necessitating rewiring of the display interface connections.

Q: What is the impact of the forward voltage difference (1.7V vs. 1.85V)?

A: The 0.15V increase requires driver circuit adjustment to maintain proper LED current. Existing current-limiting resistor values may require recalculation to accommodate the higher forward voltage while maintaining desired brightness levels.

Q: Why does the SC08-12SRWA require 20mA test current compared to the HDSP-N105's 5mA?

A: The SC08-12SRWA is specified for higher operating current, resulting in increased luminous intensity (36mcd vs. 4.6mcd). This provides superior brightness and visibility. Driver circuits must be rated for the higher current demand.

Q: Are both components suitable for the same applications?

A: Both are 7-segment red displays with common cathode configuration and 0.80" character height. Functional compatibility exists for numeric and alphanumeric display applications. Circuit-level design changes are required to accommodate electrical and package differences.

Q: What are the compliance implications of substitution?

A: Both components maintain ROHS3 compliance and MSL 1 ratings. No regulatory or environmental compliance issues arise from substitution. Existing certifications and approvals should be reviewed for any product-level changes resulting from component substitution.

Q: Is the physical size difference significant?

A: Physical dimensions are nearly identical (within 0.001" tolerance). The SC08-12SRWA measures 1.091" H x 0.787" W x 0.331" D compared to the HDSP-N105's 1.090" H x 0.786" W x 0.330" D. This negligible difference does not impact mechanical fit in standard display housings.