HDSP-7518 Equivalent & Substitute Parts

Part Overview

The HDSP-7518 is a 7-segment LED display module manufactured by Broadcom Limited, featuring a 0.30" red character with common cathode configuration in a 10-DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The HDSP-7518 operates at 1.7V forward voltage with 5mA test current and delivers 1.05mcd brightness output.

Substiute Parts

HDSP-7518

Broadcom LimitedIn Stock: 1132HDSP-7518 Datasheet

Current PartRFQ

HDSP-7508

Broadcom LimitedIn Stock: 853HDSP-7508 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HDSP-7518 is determined by the following critical parameters:

• Display Type: 7-Segment configuration
• Character Size: 0.30" (7.62mm) digit/alpha size
• Common Pin Configuration: Common Cathode
• Color: Red (635nm wavelength)
• Package: 10-DIP (0.200", 5.08mm), 7 Leads
• Number of Characters: +/-1 (overflow)

The HDSP-7508 qualifies as a direct substitute based on matching all these core parameters. While electrical characteristics differ (forward voltage and test current), the mechanical compatibility, pinout configuration, and functional display capability remain equivalent for circuit integration purposes.

Parameter Comparison

Engineering Selection Recommendations

The HDSP-7508 is the qualified substitute for the obsolete HDSP-7518. Selection should be based on the following factors:

Product Status: The HDSP-7508 maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete HDSP-7518.

Compliance: The HDSP-7508 carries ROHS3 compliance certification, meeting current environmental and regulatory requirements. Both parts maintain REACH Unaffected status and EAR99 export classification.

Electrical Characteristics: The HDSP-7508 operates at higher forward voltage (2V vs. 1.7V) and test current (20mA vs. 5mA), resulting in increased brightness output (5.39mcd vs. 1.05mcd) and higher power dissipation (105mW vs. 52mW). Circuit designs must accommodate these electrical differences through appropriate current-limiting resistor adjustments.

Mechanical Compatibility: Both parts share identical package dimensions, pinout configuration, and DIP footprint, enabling direct PCB-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the HDSP-7508 be used as a direct pin-for-pin replacement for the HDSP-7518?

A: Yes. Both parts feature identical 10-DIP (0.200", 5.08mm) packaging with 7 leads and common cathode configuration. PCB footprints and pinout assignments are compatible. However, circuit current-limiting resistors must be recalculated to accommodate the HDSP-7508's higher forward voltage and test current specifications.

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

A: The HDSP-7508 operates at 2V forward voltage with 20mA test current, compared to the HDSP-7518's 1.7V and 5mA specifications. This results in approximately 5x higher brightness output (5.39mcd vs. 1.05mcd) and doubled power dissipation (105mW vs. 52mW). Existing circuit designs require resistor value adjustments to maintain proper LED current levels.

Q: Why is the HDSP-7518 listed as obsolete?

A: The HDSP-7518 has reached end-of-life status in Broadcom's product portfolio. The HDSP-7508, part of the active HDSP-750x series, represents the current production equivalent with enhanced brightness and modern compliance certifications.

Q: Are there any compliance differences between these parts?

A: The HDSP-7508 carries ROHS3 compliance certification, meeting current environmental regulations. Both parts maintain REACH Unaffected status and identical ECCN/HTSUS classifications. For new designs, the HDSP-7508's compliance profile is preferred.

Q: What is the physical size difference between these displays?

A: The HDSP-7518 measures 0.500" H x 0.300" W x 0.390" D. The HDSP-7508 measures 0.500" H x 0.300" W x 0.240" D. The depth dimension is reduced by approximately 0.150", which may affect enclosure clearance in space-constrained applications.