HDSP-K121 Equivalent & Substitute Parts

Part Overview

The HDSP-K121 is a dual-character red 7-segment LED display module manufactured by Broadcom Limited. This common anode display operates at 1.7V forward voltage with a 5mA test current and features a 0.56" digit height in an 18-DIP package. The product is currently active and RoHS3 compliant. Substitute parts are identified when equivalent functional performance is required due to component availability, supply chain constraints, or design flexibility within acceptable electrical parameter ranges.

Substiute Parts

HDSP-K121

Broadcom LimitedIn Stock: 2251HDSP-K121 Datasheet

Current PartRFQ

LTD-6910HR

Lite-On Inc.In Stock: 2716LTD-6910HR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HDSP-K121 is based on the following critical parameters that must remain constant or within acceptable tolerance:

• Display Configuration: 2-character, 7-segment, common anode architecture
• Digit Height: 0.56" (14.22mm) nominal dimension
• Package Type: 18-DIP (0.600", 15.24mm) pinout compatibility
• Color: Red wavelength in the 635–645nm range
• Compliance: RoHS3 compliance maintained

The LTD-6910HR from Lite-On Inc. qualifies as a substitute based on matching display configuration, digit height, package type, color specification, and RoHS3 compliance status. Electrical parameters (forward voltage and test current) differ within acceptable ranges for common anode 7-segment displays and do not preclude functional substitution in circuit designs with appropriate current-limiting resistor adjustment.

Parameter Comparison

Engineering Selection Recommendations

Both the HDSP-K121 and LTD-6910HR maintain active product status and RoHS3 compliance, supporting long-term design viability. The LTD-6910HR is REACH Affected, whereas the HDSP-K121 is REACH Unaffected; this distinction applies to supply chain and regulatory documentation requirements. Selection between these parts depends on circuit design parameters: the HDSP-K121 operates at lower forward voltage and test current, while the LTD-6910HR requires higher current-limiting resistor values due to its 2V forward voltage and 20mA test current specification. Both parts share identical mechanical footprint and pinout compatibility in 18-DIP packaging, enabling direct substitution with appropriate resistor network recalculation.

Frequently Asked Questions (FAQ)

Q: Can the LTD-6910HR replace the HDSP-K121 in existing circuit designs?

A: Direct pin-for-pin replacement is possible due to identical 18-DIP package and pinout. However, current-limiting resistor values must be recalculated to accommodate the LTD-6910HR's higher forward voltage (2V vs. 1.7V) and test current (20mA vs. 5mA) specifications.

Q: What are the key differences between these two 7-segment displays?

A: The primary differences are forward voltage (1.7V vs. 2V), test current (5mA vs. 20mA), peak wavelength (645nm vs. 635nm), and maximum power dissipation (37mW vs. 75mW). Display configuration, digit height, package type, and common anode architecture remain identical.

Q: Are both parts RoHS3 compliant?

A: Yes, both the HDSP-K121 and LTD-6910HR are RoHS3 compliant. The LTD-6910HR is REACH Affected, while the HDSP-K121 is REACH Unaffected; consult regulatory documentation for your specific application requirements.

Q: Do these displays have the same mechanical dimensions?

A: Both displays feature 0.56" (14.22mm) digit height and 18-DIP (0.600", 15.24mm) package footprint. Overall housing dimensions differ slightly (HDSP-K121: 0.670" H × 0.990" W; LTD-6910HR: 0.750" H × 0.984" W), but both fit standard 18-DIP sockets without modification.

Q: Which part should I select for new designs?

A: Selection is based on electrical requirements and supply availability. The HDSP-K121 is suitable for low-current applications; the LTD-6910HR accommodates higher-current designs. Both are active products with established supply chains.