HDSP-3905 Equivalent & Substitute Parts

Part Overview

The HDSP-3905 is a 7-segment LED display module manufactured by Broadcom Limited, featuring a single red character with 0.80" digit height in an 18-DIP package configuration. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The display operates as a common cathode device with a forward voltage of 2.6V and test current of 100mA, suitable for numeric and alphanumeric display applications requiring standard brightness output.

Substiute Parts

HDSP-3905

Broadcom LimitedIn Stock: 1034HDSP-3905 Datasheet

Current PartRFQ

SC08-12EWA

KingbrightIn Stock: 757SC08-12EWA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HDSP-3905 is determined by the following critical parameters:

• Display Type & Configuration: 7-segment, single character, common cathode topology
• Physical Dimensions: 0.80" digit height for visual consistency
• Electrical Characteristics: Forward voltage and test current within compatible operating ranges
• Package Type: DIP package format for PCB mounting compatibility
• Compliance & Status: Active product status with current manufacturing availability and regulatory compliance

The SC08-12EWA from Kingbright meets these substitution criteria as an active, currently manufactured alternative with matching display type, character count, digit size, common cathode configuration, and color specification. Package variation from 18-DIP to 16-DIP represents a standard industry substitution pattern for this component category, with pin configuration differences manageable through PCB layout adaptation.

Parameter Comparison

Engineering Selection Recommendations

The SC08-12EWA is the qualified substitute for the obsolete HDSP-3905 based on the following engineering criteria:

Product Status & Availability: The SC08-12EWA maintains active manufacturing status with current inventory availability (725 pcs), whereas the HDSP-3905 is obsolete. This ensures long-term supply chain continuity for production and maintenance applications.

Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying current environmental and regulatory requirements for electronic component procurement.

Functional Equivalence: Matching display type (7-segment), character count (1), digit size (0.80"), common cathode configuration, and red color specification ensure functional compatibility in display applications.

Electrical Performance: The SC08-12EWA operates at lower forward voltage (2.0V vs. 2.6V) and reduced test current (20mA vs. 100mA), resulting in lower power dissipation (75mW vs. 105mW). These characteristics represent improved efficiency while maintaining comparable brightness output (8mcd vs. 7mcd).

Package Consideration: The transition from 18-DIP to 16-DIP package requires PCB layout modification. Pin configuration differences must be evaluated during design integration to ensure proper electrical connections and mechanical fit.

Frequently Asked Questions (FAQ)

Q: Can the SC08-12EWA directly replace the HDSP-3905 without PCB modifications?

A: No. The package change from 18-DIP to 16-DIP requires PCB layout adaptation. Pin assignments differ between the two packages, necessitating schematic and layout review before implementation.

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

A: The SC08-12EWA operates at lower forward voltage (2.0V vs. 2.6V) and reduced test current (20mA vs. 100mA). These differences result in lower power dissipation and may require adjustment to current-limiting resistor values in the display driver circuit.

Q: Are both components compliant with current environmental regulations?

A: Yes. Both the HDSP-3905 and SC08-12EWA maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.

Q: Why is the SC08-12EWA recommended despite the package difference?

A: The SC08-12EWA is the only active substitute meeting the critical substitution parameters: 7-segment display type, single character, 0.80" digit height, common cathode configuration, and red color. The package difference is a standard industry substitution pattern for this component category and is manageable through PCB redesign.

Q: How do the brightness characteristics compare?

A: The SC08-12EWA provides slightly higher brightness (8mcd vs. 7mcd) at lower power consumption, making it suitable for applications requiring equivalent or improved visual output with reduced power requirements.

Q: What is the wavelength difference between these displays?

A: The HDSP-3905 operates at 635nm peak wavelength, while the SC08-12EWA operates at 627nm. Both wavelengths fall within the standard red LED spectrum and are visually compatible for most display applications.