LTS-2801AB 7-Segment Display - Equivalent & Substitute Parts

Part Overview

The LTS-2801AB is a single-character, 0.28-inch blue 7-segment LED display manufactured by Lite-On Inc. in a 10-DIP package configuration. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The display operates at 3.8V forward voltage with a 20mA test current and delivers 3mcd brightness at a peak wavelength of 428nm. Its compact form factor and common anode configuration make it suitable for numeric display applications requiring discrete component integration.

Substiute Parts

LTS-2801AB

Lite-On Inc.In Stock: 1065LTS-2801AB Datasheet

Current PartRFQ

HDSM-281B

Broadcom LimitedIn Stock: 2340HDSM-281B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LTS-2801AB is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

• Display type: 7-Segment, single character
• Digit size: 0.28" (7.00mm)
• Color: Blue
• Common pin configuration: Common Anode
• Voltage compatibility: Forward voltage within acceptable operating range
• Current rating: 20mA test current capability
• Brightness class: Millicandela rating suitable for the application
• Wavelength: Blue spectrum (420-470nm range)
• RoHS compliance: ROHS3 Compliant

The HDSM-281B from Broadcom Limited qualifies as a substitute based on matching all critical electrical parameters (common anode, blue color, 20mA current rating, ROHS3 compliance) and identical digit size. Package configuration differs (12-SMD vs. 10-DIP), requiring circuit board redesign. Voltage specification (3.3V vs. 3.8V) and brightness rating (6mcd vs. 3mcd) represent measurable differences within acceptable substitution tolerance for this component category.

Parameter Comparison

Engineering Selection Recommendations

The HDSM-281B serves as an active substitute for the obsolete LTS-2801AB. Both components maintain ROHS3 compliance and meet the core functional requirements of a single-character, 0.28-inch blue 7-segment common anode display.

Selection basis:

• The LTS-2801AB is obsolete; the HDSM-281B is active production status, ensuring long-term supply availability
• Both components are ROHS3 compliant, meeting environmental and regulatory requirements
• Electrical compatibility is established through matching common anode configuration, 20mA current rating, and blue color specification
• The HDSM-281B operates at 3.3V versus the LTS-2801AB's 3.8V, representing a 0.5V reduction in forward voltage
• The HDSM-281B provides higher brightness (6mcd vs. 3mcd) and operates at a longer wavelength (462nm vs. 428nm)
• Package transition from 10-DIP to 12-SMD surface mount requires circuit board layout modification

Frequently Asked Questions (FAQ)

Q: Can the HDSM-281B directly replace the LTS-2801AB without circuit modifications?

A: No. The HDSM-281B uses a 12-SMD surface mount package versus the 10-DIP through-hole package of the LTS-2801AB. Circuit board layout and footprint design must be updated. Pin configuration and electrical connections differ between package types.

Q: What is the voltage difference between these parts, and does it affect compatibility?

A: The LTS-2801AB operates at 3.8V forward voltage; the HDSM-281B operates at 3.3V. This 0.5V difference is within acceptable substitution tolerance for LED display applications. Circuit current-limiting resistor values may require adjustment to maintain consistent brightness and current draw.

Q: Why does the HDSM-281B have higher brightness (6mcd vs. 3mcd)?

A: The HDSM-281B delivers greater luminous intensity at the same 20mA test current. This represents an improvement in display visibility and does not prevent substitution. Applications requiring the original brightness level can reduce drive current through resistor adjustment.

Q: Are both parts RoHS compliant?

A: Yes. Both the LTS-2801AB and HDSM-281B are ROHS3 compliant, meeting environmental and regulatory standards for electronic components.

Q: What is the difference in wavelength between these displays?

A: The LTS-2801AB peaks at 428nm; the HDSM-281B peaks at 462nm. Both wavelengths fall within the blue spectrum. The HDSM-281B produces a slightly longer wavelength blue color. Visual color difference may be perceptible in side-by-side comparison.

Q: Does the HDSM-281B have different moisture sensitivity requirements?

A: Yes. The LTS-2801AB has MSL 1 (unlimited moisture sensitivity); the HDSM-281B has MSL 3 (168 hours). The HDSM-281B requires moisture control during storage and handling. Standard surface mount assembly processes accommodate MSL 3 components.