LTS-4301B Equivalent & Substitute Parts

Part Overview

The LTS-4301B is a 7-segment LED display module manufactured by Lite-On Inc., featuring a single blue character with common cathode configuration in a 10-DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The display operates at 3.8V forward voltage with a 20mA test current and provides 3.6mcd brightness output at a 428nm peak wavelength.

Substiute Parts

LTS-4301B

Lite-On Inc.In Stock: 875LTS-4301B Datasheet

Current PartRFQ

SMC391LB G/W

American Opto Plus LEDIn Stock: 856SMC391LB G/W Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LTS-4301B is determined by the following critical parameters:

• Display Configuration: Single character, 7-segment, common cathode topology
• Character Size: 0.39" (10.00mm) digit/alpha size
• Color: Blue LED emission
• Electrical Compatibility: Forward voltage range, test current, and power dissipation capacity
• Package Compatibility: Physical dimensions and pin configuration must accommodate existing PCB layouts
• Compliance: RoHS3 compliance and MSL rating for manufacturing processes

The substitute part SMC391LB G/W meets these core substitution criteria while offering improved brightness (40mcd vs. 3.6mcd) and operates at a lower forward voltage (3.2V vs. 3.8V). Both parts maintain common cathode configuration, identical character size, and blue color specification.

Parameter Comparison

Engineering Selection Recommendations

The SMC391LB G/W is the manufacturer-recommended substitute for the obsolete LTS-4301B. Both components maintain ROHS3 compliance and are suitable for equivalent functional replacement in 7-segment display applications requiring a single blue character with common cathode configuration.

The primary consideration for selection is package type: the LTS-4301B uses a through-hole 10-DIP package, while the SMC391LB G/W employs a surface-mount 10-SMD, No Lead configuration. This difference requires PCB redesign if transitioning from through-hole to surface-mount assembly processes.

Electrical parameter differences include lower forward voltage (3.2V vs. 3.8V) and higher brightness output (40mcd vs. 3.6mcd) in the substitute part. These characteristics may require circuit design adjustments to maintain consistent display brightness and power consumption profiles in the target application.

Frequently Asked Questions (FAQ)

Q: Can the SMC391LB G/W directly replace the LTS-4301B without PCB modification?

A: Direct pin-for-pin replacement is not possible due to package type differences. The LTS-4301B is a through-hole 10-DIP component, while the SMC391LB G/W is a surface-mount 10-SMD, No Lead device. PCB layout redesign is required for mechanical and electrical integration.

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

A: The SMC391LB G/W operates at a lower forward voltage (3.2V vs. 3.8V) and provides significantly higher brightness (40mcd vs. 3.6mcd). Both maintain identical test current (20mA) and common cathode configuration. Circuit design adjustments may be necessary to optimize brightness and power consumption for the target application.

Q: Are both parts RoHS compliant?

A: Yes, both the LTS-4301B and SMC391LB G/W are ROHS3 compliant. However, the substitute part has a higher moisture sensitivity level (MSL 2A, 4 weeks) compared to the original part (MSL 1, unlimited), which may affect storage and handling requirements in manufacturing environments.

Q: What is the wavelength difference between these displays?

A: The LTS-4301B has a peak wavelength of 428nm, while the SMC391LB G/W operates at 470nm. Both are classified as blue displays, but the substitute part emits at a longer wavelength within the blue spectrum, which may result in a slightly different perceived color appearance.

Q: Are there any power dissipation considerations?

A: The SMC391LB G/W has a maximum power dissipation of 120mW compared to 65mW for the LTS-4301B. This higher dissipation rating provides greater thermal margin but does not indicate increased power consumption at standard operating conditions (20mA test current).