LB-302VF 7-Segment LED Display - Equivalent & Substitute Parts

Part Overview

The LB-302VF is a dual-character 7-segment LED display module manufactured by Rohm Semiconductor. It features a common anode configuration with red LED elements, designed for numeric and alphanumeric display applications. The device operates at 2V forward voltage with 10mA test current and delivers 6.3mcd brightness output.

This part carries a "Not For New Designs" status, making identification of functionally equivalent alternatives essential for ongoing production support and design continuity. Substitute parts must maintain compatibility across electrical characteristics, physical dimensions, and packaging specifications to ensure direct replacement capability.

Substiute Parts

LB-302VF

Rohm SemiconductorIn Stock: 1240LB-302VF Datasheet

Current PartRFQ

LDD-E305RI

Lumex Opto/Components Inc.In Stock: 942LDD-E305RI Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LB-302VF is determined by strict adherence to the following parameters:

Critical Parameters (Must Match Exactly):

• Number of Characters: 2
• Display Type: 7-Segment
• Common Pin Configuration: Common Anode
• Color: Red
• Digit Size: 0.30" (7.62mm)
• Physical Dimensions: 0.591" H × 0.610" W × 0.283" D (15.00mm × 15.50mm × 7.20mm)
• Package Type: 10-DIP (0.400", 10.16mm)

Allowable Parameter Variations:

• Voltage - Forward (Vf): ±0.3V tolerance acceptable for common anode red LED displays
• Current - Test: ±2mA tolerance acceptable
• Millicandela Rating: Variation acceptable within brightness specification range
• Wavelength - Peak: Variation acceptable within red spectrum (620nm–700nm)
• Power Dissipation: Variation acceptable based on forward voltage and current differences

The LDD-E305RI qualifies as a substitute part based on matching all critical parameters while remaining within allowable electrical variations.

Parameter Comparison

Engineering Selection Recommendations

LDD-E305RI Substitution Assessment:

The LDD-E305RI meets all critical dimensional and functional requirements for direct substitution of the LB-302VF. Both parts are ROHS3 compliant and carry identical moisture sensitivity ratings, ensuring regulatory and environmental compatibility.

The forward voltage difference of +0.2V (2.2V vs. 2.0V) falls within acceptable tolerance for common anode red LED display circuits and requires no circuit redesign. The increased power dissipation (105mW vs. 50mW) reflects this voltage differential and remains within typical thermal management capabilities of standard display driver circuits.

The LDD-E305RI carries Active product status, providing long-term availability and supply chain continuity compared to the LB-302VF's "Not For New Designs" classification. This makes the LDD-E305RI the preferred choice for production support and design transitions.

The brightness variation (0.5mcd vs. 6.3mcd) represents a significant difference in millicandela rating. Applications requiring the original brightness specification of 6.3mcd should evaluate this parameter against specific visibility requirements before substitution.

Frequently Asked Questions (FAQ)

Q: Can the LDD-E305RI be used as a direct pin-for-pin replacement for the LB-302VF?

A: Yes. Both parts use identical 10-DIP packaging with 0.400" (10.16mm) lead spacing and common anode configuration. No PCB modifications are required for physical installation.

Q: What is the impact of the +0.2V forward voltage difference?

A: The LDD-E305RI operates at 2.2V compared to the LB-302VF's 2.0V. This difference is typical among red LED display variants and does not require circuit redesign. Current-limiting resistor values may require minor adjustment if precise current control is critical, but standard designs accommodate this variation.

Q: Why is the millicandela rating significantly lower on the LDD-E305RI?

A: The LDD-E305RI delivers 0.5mcd versus the LB-302VF's 6.3mcd. This represents a substantial brightness difference. Applications where display visibility is critical should evaluate whether the lower brightness meets operational requirements before substitution.

Q: Are both parts compliant with the same regulatory standards?

A: Yes. Both the LB-302VF and LDD-E305RI are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited). They meet the same environmental and regulatory requirements.

Q: What is the significance of the LB-302VF's "Not For New Designs" status?

A: This status indicates the part is obsolete for new product development. The LDD-E305RI's Active status makes it suitable for ongoing production and new designs requiring equivalent functionality.

Q: Are there any thermal considerations when substituting the LDD-E305RI?

A: The LDD-E305RI has a maximum power dissipation of 105mW compared to 50mW for the LB-302VF. This difference is due to the higher forward voltage. Standard PCB thermal design for display modules accommodates this variation without additional cooling measures.