LA-301XB Yellow 7-Segment LED Display Equivalent & Substitute Parts

Part Overview

The LA-301XB is a single-character yellow 7-segment LED display manufactured by Rohm Semiconductor 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 as a common anode configuration with a 0.31-inch character height, suitable for numeric and alphanumeric applications requiring yellow LED indication.

Key Parameters

Parameter	Value
Manufacturer Part Number	LA-301XB
Manufacturer	Rohm Semiconductor
Display Type	7-Segment
Character Count	1
Character Height	0.31" (8.00mm)
Common Pin Configuration	Common Anode
Color	Yellow
Package Type	10-DIP (0.209", 5.30mm)
Physical Dimensions	0.433" H x 0.276" W x 0.197" D (11.00mm x 7.00mm x 5.00mm)
Product Status	Obsolete
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LA-301XB are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Display type: 7-Segment configuration
Character count: Single character
Character height: 0.31" (8.00mm)
Common pin configuration: Common Anode
Color: Yellow
Package type: 10-DIP (0.209", 5.30mm)
Wavelength range: 583–589nm (yellow spectrum)

Allowable Parameter Variations:

Forward voltage (Vf): 2.05V to 2.2V
Test current: 10mA to 20mA
Millicandela rating: 2.74mcd to 90mcd
Power dissipation: 65mW to 80mW
Physical dimensions: Minor variations within tolerance (±0.01")

The substitute parts HDSP-U301 and HDSP-U311 meet all critical matching parameters and fall within allowable electrical variations. Both are manufactured by Broadcom Limited and maintain active product status.

Parameter Comparison

Parameter	LA-301XB (Rohm)	HDSP-U301 (Broadcom)	HDSP-U311 (Broadcom)
Display Type	7-Segment	7-Segment	7-Segment
Character Count	1	1	1
Character Height	0.31" (8.00mm)	0.31" (8.00mm)	0.31" (8.00mm)
Common Pin Configuration	Common Anode	Common Anode	Common Anode
Color	Yellow	Yellow	Yellow
Package Type	10-DIP (0.209", 5.30mm)	10-DIP (0.209", 5.30mm)	10-DIP (0.209", 5.30mm)
Physical Dimensions (H x W x D)	0.433" x 0.276" x 0.197" (11.00mm x 7.00mm x 5.00mm)	0.433" x 0.280" x 0.197" (11.00mm x 7.10mm x 5.00mm)	0.433" x 0.280" x 0.197" (11.00mm x 7.10mm x 5.00mm)
Voltage - Forward (Vf) (Typ)	2.05V	2.2V	2.2V
Current - Test	10mA	20mA	20mA
Millicandela Rating	90mcd	2.74mcd	2.74mcd
Wavelength - Peak	589nm	583nm	583nm
Power Dissipation (Max)	65mW	80mW	80mW
Product Status	Obsolete	Active	Active
RoHS Compliance	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Option	Not specified	Bulk	Tube

Engineering Selection Recommendations

Both HDSP-U301 and HDSP-U311 are direct functional equivalents for the obsolete LA-301XB. Selection between these two Broadcom alternatives is determined by packaging requirements:

HDSP-U301: Supplied in bulk packaging. Suitable for high-volume production environments where component handling and tape-and-reel or loose component storage is standard practice.

HDSP-U311: Supplied in tube packaging. Suitable for applications requiring organized component storage, reduced handling damage risk, or lower-volume production runs.

Both parts maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory alignment. The electrical parameter variations (forward voltage 2.2V vs. 2.05V, test current 20mA vs. 10mA) fall within standard design tolerances for 7-segment display applications and do not restrict substitution eligibility.

Frequently Asked Questions (FAQ)

Q: Can HDSP-U301 and HDSP-U311 be used interchangeably with LA-301XB?

A: Yes. Both parts are electrically and mechanically equivalent. The only difference is packaging format (bulk vs. tube). Circuit-level performance and PCB footprint compatibility are identical.

Q: What is the difference between HDSP-U301 and HDSP-U311?

A: Both parts are identical in electrical specifications and physical dimensions. HDSP-U301 is supplied in bulk packaging, while HDSP-U311 is supplied in tube packaging. Selection depends on procurement and assembly workflow requirements.

Q: Why does the LA-301XB have higher millicandela rating (90mcd) compared to the Broadcom substitutes (2.74mcd)?

A: The millicandela rating difference reflects manufacturing variations and measurement conditions between Rohm and Broadcom specifications. Both parts operate within the yellow LED spectrum (583–589nm) and are suitable for standard 7-segment display applications. Design brightness requirements should be validated against actual application needs.

Q: Are there any pin configuration differences between these parts?

A: No. All three parts use identical 10-DIP pin configuration with common anode architecture. Direct PCB substitution is possible without circuit redesign.

Q: What are the compliance and regulatory considerations?

A: All three parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.41.0000. Moisture sensitivity level is 1 (unlimited) for all parts, indicating no special storage or handling requirements.

Q: Is the 0.15mm width difference (7.00mm vs. 7.10mm) significant for PCB layout?

A: No. The 0.15mm variation is within standard mechanical tolerance for DIP package components and does not affect PCB footprint compatibility or mounting.

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