LA-401XD 7-Segment LED Display - Equivalent & Substitute Parts

Part Overview

The LA-401XD is a single-character 7-segment LED display module manufactured by Rohm Semiconductor, featuring a 0.40" yellow display in a 10-DIP package configuration. This component is classified as Not For New Designs, indicating it has reached end-of-life status. For applications requiring continued sourcing or new design implementations, equivalent substitute parts with compatible electrical and mechanical specifications are available from alternative manufacturers such as Kingbright.

Substiute Parts

LA-401XD

Rohm SemiconductorIn Stock: 929LA-401XD Datasheet

Current PartRFQ

SA39-12SYKWA

KingbrightIn Stock: 745SA39-12SYKWA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LA-401XD are identified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Compatibility Criteria:

• Display Type: 7-Segment configuration
• Number of Characters: Single character (1)
• Common Pin Configuration: Common Anode
• Color: Yellow
• Package Type: 10-DIP (0.300", 7.62mm)
• Digit Size: Approximately 0.39" to 0.40" (9.60mm to 10.16mm width)

Allowable Parameter Variations:

• Forward Voltage (Vf): Range 2.0V to 2.05V
• Test Current: 10mA to 20mA
• Millicandela Rating: 86mcd to 90mcd
• Wavelength Peak: 589nm to 590nm
• Power Dissipation: Up to 75mW
• Physical Height/Depth: Within ±0.5mm tolerance

The SA39-12SYKWA from Kingbright meets all primary compatibility criteria and falls within allowable parameter variations, qualifying it as a direct substitute for the LA-401XD.

Parameter Comparison

Engineering Selection Recommendations

The SA39-12SYKWA from Kingbright is a qualified substitute for the LA-401XD based on the following factors:

Compliance and Certification Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility in applications subject to environmental and hazardous substance restrictions.

Product Status Consideration: The LA-401XD is designated Not For New Designs, indicating discontinued support from the original manufacturer. The SA39-12SYKWA carries Active product status, providing ongoing availability and manufacturer support for new applications and production continuity.

Electrical Parameter Compatibility: The SA39-12SYKWA operates within acceptable electrical parameters for direct substitution. The forward voltage differential of 0.05V and increased test current of 20mA (versus 10mA) remain within standard circuit design tolerances for common-anode 7-segment display applications.

Mechanical and Optical Compatibility: Both parts share identical package configuration (10-DIP), pin pitch (0.300", 7.62mm), and overall height (0.512"). The width variation of 0.016" (0.40mm) is negligible for standard PCB layout applications. Optical output remains consistent with millicandela ratings of 86mcd to 90mcd and wavelength peaks within 1nm of each other.

Frequently Asked Questions (FAQ)

Q: Can the SA39-12SYKWA be used as a direct pin-for-pin replacement for the LA-401XD?

A: Yes. Both parts use identical 10-DIP package configuration with matching pin assignments for common-anode 7-segment displays. No circuit modifications are required for direct substitution.

Q: What is the significance of the 10mA versus 20mA test current difference?

A: The test current specification indicates the current level at which the display's optical characteristics are measured. The SA39-12SYKWA's higher test current (20mA) does not prevent substitution; it reflects the manufacturer's measurement standard. Circuit design should account for the actual operating current required by the application, which may differ from test current specifications.

Q: Are there any PCB layout considerations due to the 0.016" width difference?

A: The width difference between the LA-401XD (0.378") and SA39-12SYKWA (0.394") is 0.016" (0.40mm). This variation is within standard PCB tolerance and does not require layout modifications for typical through-hole DIP socket applications.

Q: How do the optical specifications compare between these two parts?

A: Both parts deliver comparable optical performance. The LA-401XD provides 90mcd at 589nm wavelength, while the SA39-12SYKWA provides 86mcd at 590nm wavelength. The 4mcd difference and 1nm wavelength shift are imperceptible in standard display applications and do not affect functional compatibility.

Q: What is the impact of the 0.05V forward voltage difference on circuit design?

A: The forward voltage difference (2.05V versus 2.0V) is negligible for most applications. Standard current-limiting resistor calculations will accommodate this variation without requiring circuit redesign. Verify that the power supply voltage and series resistor values remain appropriate for the operating current range.

Q: Is the SA39-12SYKWA suitable for new product designs?

A: Yes. The SA39-12SYKWA carries Active product status and ROHS3 compliance, making it appropriate for new designs. The LA-401XD's Not For New Designs designation makes the SA39-12SYKWA the recommended choice for applications requiring long-term component availability and manufacturer support.