LB-303MK Equivalent & Substitute Parts

Part Overview

The LB-303MK is a 3-character green 7-segment LED display module manufactured by Rohm Semiconductor, packaged in 12-DIP configuration. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The display operates at 2.1V forward voltage with 10mA test current and provides 6.3mcd brightness output at 563nm peak wavelength.

Substiute Parts

LB-303MK

Rohm SemiconductorIn Stock: 1229LB-303MK Datasheet

Current PartRFQ

XDUG09C3

SunLEDIn Stock: 999XDUG09C3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LB-303MK is determined by the following critical parameters:

• Display Type: Must be 7-Segment
• Number of Characters: Must be 3
• Common Pin Configuration: Must be Common Cathode
• Color: Must be Green
• Package / Case: Must be 12-DIP configuration
• Voltage - Forward (Vf): Operating range 2.0V to 2.1V
• Current - Test: Must be 10mA
• RoHS Status: Must maintain ROHS3 Compliance

The XDUG09C3 from SunLED meets all substitution criteria. While dimensional variations exist in digit size (0.36" vs. 0.31") and overall module dimensions, the electrical characteristics, pin configuration, and functional performance remain compatible for direct replacement in applications where the LB-303MK is specified.

Parameter Comparison

Engineering Selection Recommendations

The XDUG09C3 is a direct functional equivalent for the LB-303MK based on the following engineering criteria:

• Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment
• Electrical specifications are compatible: forward voltage differential of 0.1V (2.1V vs. 2.0V) is within acceptable operating margins for standard LED driver circuits
• Pin configuration and package family (12-DIP) ensure mechanical and electrical compatibility with existing PCB layouts
• The XDUG09C3 carries active product status, providing supply chain continuity and long-term availability compared to the obsolete LB-303MK
• Wavelength variation (563nm vs. 565nm) is negligible for visual perception and application performance

Frequently Asked Questions (FAQ)

Q: Can the XDUG09C3 be used as a direct replacement for the LB-303MK without circuit modifications?

A: Yes. Both components share identical electrical specifications (10mA test current, common cathode configuration) and compatible forward voltage ratings (2.0V vs. 2.1V). The 12-DIP package footprint supports direct PCB substitution.

Q: What are the dimensional differences between these displays?

A: The LB-303MK has a digit size of 0.31" (8.00mm) with overall dimensions of 0.512" H x 0.866" W x 0.197" D. The XDUG09C3 has a digit size of 0.36" (9.14mm) with overall dimensions of 0.886" H x 0.551" W x 0.283" D. These differences may affect visual appearance and PCB layout spacing but do not impact electrical compatibility.

Q: Are there any compliance or certification differences?

A: Both components are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. No compliance disadvantages exist for substitution.

Q: Why is the XDUG09C3 preferred over the LB-303MK?

A: The XDUG09C3 maintains active product status with confirmed inventory availability, whereas the LB-303MK is obsolete. For new designs and ongoing production, the XDUG09C3 provides supply chain security and manufacturer support.

Q: What is the significance of the wavelength difference (563nm vs. 565nm)?

A: Both wavelengths fall within the green spectrum and are imperceptible to human vision. The 2nm difference has no practical impact on display appearance or application performance.