LDQ-A512RI Equivalent & Substitute Parts

Part Overview

The LDQ-A512RI is a 4-character 7-segment LED display module manufactured by Lumex Opto/Components Inc. This green common anode display operates at 2.2V forward voltage with a 10mA test current and features a 0.56" digit size in a 36-DIP module package. The device is Active product status and ROHS3 compliant.

Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameters of the 7-segment display category. The primary driver for substitution is package availability, inventory levels, or specific application requirements for forward voltage, current draw, or brightness characteristics.

Substiute Parts

LDQ-A512RI

Lumex Opto/Components Inc.In Stock: 943LDQ-A512RI Datasheet

Current PartRFQ

LTC-5623G

Lite-On Inc.In Stock: 2013LTC-5623G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LDQ-A512RI is determined by the following criteria:

Mandatory Matching Parameters:

• Display Type: 7-Segment LED
• Number of Characters: 4
• Digit Size: 0.56" (14.22mm)
• Color: Green
• Common Pin Configuration: Common Anode
• Wavelength - Peak: 565nm
• Physical Dimensions: 0.748" H x 1.980" W x 0.315" D (19.00mm x 50.30mm x 8.00mm)

Allowable Variation Parameters:

• Voltage - Forward (Vf) Typical: Within circuit design tolerance
• Current - Test: Within circuit design tolerance
• Package / Case: Different DIP configurations acceptable if mechanical fit is verified
• Power Dissipation (Max): Dependent on application thermal requirements

The LTC-5623G qualifies as a substitute based on matching all mandatory parameters while operating within allowable electrical variations for common anode 4-character green 7-segment displays.

Parameter Comparison

Engineering Selection Recommendations

LDQ-A512RI Selection Criteria:

• Applications requiring 3.9mcd brightness at 10mA test current
• Designs utilizing 36-DIP module pinout
• Systems with 2.2V forward voltage specification
• Maximum power dissipation budget of 105mW per display

LTC-5623G Selection Criteria:

• Applications compatible with 12-DIP pinout
• Designs tolerating 2.1V forward voltage operation
• Systems requiring 20mA test current per character
• Applications with lower power dissipation requirement (75mW maximum)
• Brightness requirement of 2.4mcd acceptable for application

Both parts maintain ROHS3 compliance and Active product status. Selection between these parts depends on circuit board layout compatibility with the respective DIP pin configurations and application tolerance for the electrical parameter variations listed in the Parameter Comparison table.

Frequently Asked Questions (FAQ)

Q: Can LTC-5623G directly replace LDQ-A512RI on the same PCB?

A: No. The LDQ-A512RI uses a 36-DIP module package while the LTC-5623G uses a 12-DIP package. These have different pin counts and pinout configurations. PCB redesign or adapter solutions are required for physical substitution.

Q: What is the impact of the 0.1V forward voltage difference between these parts?

A: The LTC-5623G operates at 2.1V typical forward voltage compared to 2.2V for the LDQ-A512RI. This 0.1V difference is within typical circuit design tolerance for LED display applications and does not prevent substitution if the circuit design accommodates the voltage range.

Q: Why does the LTC-5623G require 20mA test current while the LDQ-A512RI requires only 10mA?

A: The test current specification reflects the measurement conditions for brightness rating. The LTC-5623G achieves 2.4mcd at 20mA, while the LDQ-A512RI achieves 3.9mcd at 10mA. Actual operating current depends on circuit design and desired brightness level.

Q: Are both parts suitable for new designs?

A: Yes. Both the LDQ-A512RI and LTC-5623G maintain Active product status and ROHS3 compliance, making them suitable for new designs. Selection should be based on package compatibility with your PCB layout and electrical parameter requirements.

Q: What is the brightness difference between these displays?

A: The LDQ-A512RI provides 3.9mcd brightness at 10mA test current, while the LTC-5623G provides 2.4mcd at 20mA test current. The LDQ-A512RI is brighter under its specified test conditions. Actual perceived brightness in an application depends on operating current and circuit design.

Q: Do both parts use the same wavelength?

A: Yes. Both the LDQ-A512RI and LTC-5623G emit at 565nm peak wavelength, ensuring identical green color appearance.