C-51505NFQJ-LG-AF Equivalent & Substitute Parts

Part Overview

The C-51505NFQJ-LG-AF is a 20x2 character display module manufactured by Kyocera International, Inc., featuring a 40-digit STN (Super-Twisted Nematic) transmissive LCD with green LED backlight. This module is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations. The part operates across a 4.5V to 5.5V supply range with parallel interface connectivity and is rated for -20°C to 70°C operating temperatures.

Substiute Parts

C-51505NFQJ-LG-AF

Kyocera International, Inc.In Stock: 1037C-51505NFQJ-LG-AF Datasheet

Current PartRFQ

C202B-KG-LW65

Focus LCDsIn Stock: 962C202B-KG-LW65 Datasheet

DirectRFQ

C202B-KB-LW65

Focus LCDsIn Stock: 881C202B-KB-LW65 Datasheet

SimilarRFQ

C202B-KR-LW65

Focus LCDsIn Stock: 1202C202B-KR-LW65 Datasheet

SimilarRFQ

C202B-KW-LW65

Focus LCDsIn Stock: 867C202B-KW-LW65 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the C-51505NFQJ-LG-AF are selected from the Focus LCDs C202B-K series based on the following compatibility criteria:

Matching Parameters (Required for Substitution):

• Display Format: 20 x 2 (40 characters)
• Display Mode: Transmissive
• Interface: Parallel
• Outline Dimensions: 116.00mm x 37.00mm (length and width match; height tolerance 14.00mm vs. 15.60mm)
• Operating Temperature Range: -20°C ~ 70°C
• Dot Size: 0.60mm W x 0.65mm H
• Character Size: 5.55mm H x 3.20mm W
• Viewing Area: 83.00mm L x 18.60mm W

Allowable Variations:

• Display Type: FSTN (Film Super-Twisted Nematic) substitutes STN technology
• Character Format: 5 x 7 Dots (substitute for 5 x 8 Dots)
• Voltage Supply: 5V fixed (substitute for 4.5V ~ 5.5V range)
• Backlight Color: Yellow, Blue, Red, or White (substitute for Green)
• Text and Background Colors: Variable per backlight selection

Four substitute part numbers are available, differentiated by backlight and text color options.

Parameter Comparison

Engineering Selection Recommendations

All four Focus LCDs C202B-K series substitutes are active products with ROHS3 compliance and REACH Unaffected status, providing regulatory advantages over the obsolete Kyocera part. Selection among C202B-KG-LW65, C202B-KB-LW65, C202B-KR-LW65, and C202B-KW-LW65 depends on application-specific color requirements and visual contrast needs.

The C202B-KW-LW65 (white backlight with white text) provides the closest visual match to the original green backlight configuration in terms of high contrast and readability. The C202B-KR-LW65 offers the highest inventory availability at 1132 pieces. All substitutes operate at fixed 5V supply versus the original 4.5V to 5.5V range, requiring circuit verification for voltage regulation compatibility.

Height reduction from 15.60mm to 14.00mm must be evaluated for mechanical fit within existing enclosures or mounting structures.

Frequently Asked Questions (FAQ)

Q: Can C202B-K series parts directly replace the C-51505NFQJ-LG-AF without circuit modifications?

A: Mechanical and electrical interfaces are compatible. The primary consideration is the fixed 5V supply requirement of C202B-K parts versus the 4.5V to 5.5V range of the original. Verify that system voltage regulation provides stable 5V output. The 1.60mm height reduction must be accommodated in mechanical design.

Q: What is the difference between STN and FSTN display technologies in these parts?

A: Both are transmissive LCD technologies. STN (Super-Twisted Nematic) and FSTN (Film Super-Twisted Nematic) differ in optical film construction. FSTN provides improved viewing angle and color saturation characteristics. The C202B-K series uses FSTN technology.

Q: Why do the substitute parts use 5 x 7 dot character format instead of 5 x 8?

A: The C202B-K series is designed with 5 x 7 dot matrix characters, which is a standard format in the Focus LCDs product line. This results in slightly reduced character height but maintains full alphanumeric and symbol display capability within the 20 x 2 format.

Q: Which backlight color option should be selected for the C202B-K substitute?

A: Backlight selection depends on application requirements. C202B-KW-LW65 (white) provides high contrast similar to the original green backlight. C202B-KR-LW65 (red) is suitable for low-light environments. C202B-KG-LW65 (yellow) and C202B-KB-LW65 (blue) offer alternative visibility profiles. All operate identically from an electrical and mechanical standpoint.

Q: Are all four C202B-K variants in active production?

A: Yes. C202B-KG-LW65, C202B-KB-LW65, C202B-KR-LW65, and C202B-KW-LW65 are all classified as active products with current inventory availability. The original C-51505NFQJ-LG-AF is obsolete.

Q: What compliance certifications apply to the substitute parts?

A: All C202B-K variants are ROHS3 compliant and REACH Unaffected, providing regulatory compliance for EU and international markets. The original part has undefined REACH status.