LTC-2723P Equivalent & Substitute Parts

Part Overview

The LTC-2723P is a 4-character red 7-segment LED display module manufactured by Lite-On Inc., designed for clock and numeric display applications. This component features a 0.28" digit size with common cathode configuration, operating at 2.1V forward voltage and 20mA test current. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing design support and production continuity.

Substiute Parts

LTC-2723P

Lite-On Inc.In Stock: 735LTC-2723P Datasheet

Current PartRFQ

LTC-4727JR

Lite-On Inc.In Stock: 3895LTC-4727JR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTC-2723P is determined by the following critical parameters:

• Character Count: Must be 4 characters to maintain display capacity
• Display Type: Must be 7-segment clock configuration for functional compatibility
• Common Pin Configuration: Must be common cathode to ensure circuit compatibility without redesign
• Color: Must be red to maintain visual consistency and wavelength compatibility
• Voltage Range: Forward voltage must be compatible with existing driver circuitry (2.0V–2.1V range acceptable)
• Current Rating: Test current of 20mA establishes the baseline for brightness and power budget
• Package Type: DIP package format required for PCB compatibility; lead count and pitch variations are acceptable if pinout remains functionally equivalent
• Compliance: RoHS3 compliance required for regulatory alignment

The LTC-4727JR meets all substitution criteria while offering improved availability and active product status.

Parameter Comparison

Engineering Selection Recommendations

The LTC-4727JR is the qualified substitute for the obsolete LTC-2723P based on the following factors:

Product Status: The LTC-4727JR maintains active product status with confirmed inventory availability (3820 pcs), whereas the LTC-2723P is obsolete with limited stock (682 pcs). For new designs and production continuity, the active part ensures long-term supply chain reliability.

Regulatory Compliance: Both parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring equivalent environmental and regulatory qualification.

Functional Compatibility: Both parts share identical character count (4), display type (7-segment clock), common cathode configuration, color (red), and test current (20mA). Forward voltage differs by 0.1V (2.1V vs. 2V), which falls within acceptable tolerance for standard LED driver circuits.

Physical Considerations: The LTC-4727JR features a larger digit size (0.39" vs. 0.28") and different package pitch (0.400" vs. 0.300" DIP). PCB layout modification is required to accommodate the larger footprint and adjusted lead spacing. The substitute has 14 leads versus 15 leads in the original part; pinout verification against schematic is mandatory before implementation.

Performance Characteristics: The LTC-4727JR provides higher brightness (0.98mcd vs. 0.75mcd) and increased power dissipation capability (70mW vs. 40mW), supporting enhanced visibility in applications requiring higher luminous intensity.

Frequently Asked Questions (FAQ)

Q: Can the LTC-4727JR be used as a direct pin-for-pin replacement for the LTC-2723P?

A: No. While both parts are 16-DIP packages, the LTC-4727JR uses 0.400" pitch (10.16mm) versus the LTC-2723P's 0.300" pitch (7.62mm). Additionally, the LTC-4727JR has 14 leads compared to 15 leads in the original part. PCB redesign is required to accommodate the different footprint and lead configuration.

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

A: The primary electrical differences are forward voltage (2.1V vs. 2V), millicandela rating (0.75mcd vs. 0.98mcd), wavelength peak (697nm vs. 639nm), and maximum power dissipation (40mW vs. 70mW). The 0.1V voltage difference is within typical LED driver tolerance. The wavelength shift from 697nm to 639nm represents a shift toward orange-red, which may be visually perceptible in side-by-side comparison.

Q: Is the LTC-4727JR brighter than the LTC-2723P?

A: Yes. The LTC-4727JR has a higher millicandela rating (0.98mcd vs. 0.75mcd), indicating greater luminous intensity at the specified test current. This increased brightness may require adjustment of current-limiting resistors in the driver circuit if the original design was optimized for the lower brightness of the LTC-2723P.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant with MSL Level 1 (Unlimited) rating. The LTC-4727JR additionally carries REACH Affected status, which may be relevant for applications subject to REACH regulation compliance requirements.

Q: What is the impact of the larger digit size on system design?

A: The LTC-4727JR digit size is 0.39" (10.00mm) compared to the LTC-2723P's 0.28" (7.00mm). This 39% increase in digit height affects visual display characteristics and requires mechanical redesign of the display window or bezel. The overall module dimensions also increase (0.504" H x 1.582" W vs. 0.394" H x 1.191" W), which may impact enclosure fit and viewing angle considerations.

Q: Can I use the same driver circuit for both parts?

A: The common cathode configuration and 20mA test current are identical, making the driver circuit topology compatible. However, the 0.1V forward voltage difference and higher brightness of the LTC-4727JR may require adjustment of current-limiting resistor values to maintain consistent brightness levels. Verification of the driver circuit's voltage headroom is recommended before implementation.