HDSP-3900 Equivalent & Substitute Parts

Part Overview

The HDSP-3900 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 identification of compatible substitute parts essential for ongoing system support and new design implementations. The display operates as a common anode configuration with a forward voltage of 2.6V and test current of 100mA, delivering 7mcd brightness at a peak wavelength of 635nm.

Substiute Parts

HDSP-3900

Broadcom LimitedIn Stock: 2500HDSP-3900 Datasheet

Current PartRFQ

SA08-12EWA

KingbrightIn Stock: 883SA08-12EWA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HDSP-3900 is determined by strict alignment across the following critical parameters:

Primary Compatibility Criteria:

• Display type: 7-Segment LED configuration
• Character count: Single character
• Digit height: 0.80" (20.32mm)
• Common pin configuration: Common Anode
• Color: Red
• Package type: 18-DIP (0.600", 15.24mm)
• Physical dimensions: Within tolerance of 1.090" H x 0.786" W x 0.330" D

Electrical Operating Parameters:

• Forward voltage (Vf): Nominal 2.0V to 2.6V range
• Test current: 20mA to 100mA operational range
• Brightness (mcd): 7mcd to 8mcd
• Wavelength: 627nm to 635nm (red spectrum)
• Power dissipation: Maximum 75mW to 105mW

The SA08-12EWA from Kingbright meets all primary compatibility criteria and operates within the specified electrical parameter ranges, qualifying it as a direct substitute for the obsolete HDSP-3900.

Parameter Comparison

Engineering Selection Recommendations

The SA08-12EWA qualifies as a direct substitute for the HDSP-3900 based on the following engineering criteria:

Mechanical Compatibility: Both components share identical 18-DIP package configuration and digit height specification (0.80"). Physical dimensions are within manufacturing tolerance, ensuring PCB footprint compatibility without layout modification.

Electrical Compatibility: The SA08-12EWA operates at a 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 are compatible with common anode drive circuits designed for the HDSP-3900, as the lower voltage and current requirements represent a less demanding electrical load.

Compliance Status: Both components maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring equivalent environmental and regulatory compatibility. The SA08-12EWA carries active product status, providing long-term availability and supply chain stability compared to the obsolete HDSP-3900.

Optical Performance: The SA08-12EWA delivers marginally higher brightness (8mcd vs. 7mcd) with a wavelength shift of 8nm toward the shorter wavelength end of the red spectrum (627nm vs. 635nm). This wavelength difference remains within the red LED spectrum and is imperceptible in typical display applications.

Frequently Asked Questions (FAQ)

Q: Can the SA08-12EWA be used as a direct replacement without circuit modification?

A: Yes. The SA08-12EWA maintains identical package configuration, pinout, and common anode topology. The lower forward voltage and current requirements are compatible with existing drive circuits. No PCB layout changes are required.

Q: What is the impact of the voltage difference (2.6V vs. 2.0V)?

A: The SA08-12EWA operates at 0.6V lower forward voltage. In common anode circuits, this reduces the voltage drop across the current-limiting resistor, potentially requiring resistor adjustment to maintain desired brightness. Verify resistor values against the SA08-12EWA datasheet for your specific application.

Q: Does the wavelength shift from 635nm to 627nm affect visual appearance?

A: The 8nm wavelength difference remains within the red spectrum and is not visually distinguishable in standard display applications. Both components produce red light suitable for alphanumeric display purposes.

Q: Are there any package or pinout differences?

A: Both components use 18-DIP (0.600", 15.24mm) package configuration. Physical dimensions are within manufacturing tolerance. Verify pinout compatibility with your specific circuit design, as common anode configuration is maintained in both parts.

Q: What is the availability status of each component?

A: The HDSP-3900 is classified as obsolete with limited inventory. The SA08-12EWA is active product status, ensuring ongoing availability and supply chain reliability for new designs and system support.