NKR131SB 7-Segment LED Display Equivalent & Substitute Parts

Part Overview

The NKR131SB is a single-character red 7-segment LED display module manufactured by Stanley Electric Co, packaged in a 10-DIP configuration with 0.31" digit height. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs, redesigns, and ongoing production support where original inventory is depleted.

The NKR131SB operates at 1.7V forward voltage with 10mA test current and delivers 2.8mcd brightness at 660nm peak wavelength. Its compact form factor (11.00mm × 7.00mm × 5.00mm) and common cathode configuration make it suitable for legacy industrial and consumer display applications.

Substiute Parts

NKR131SB

Stanley Electric CoIn Stock: 1171NKR131SB Datasheet

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HDSP-U103

Broadcom LimitedIn Stock: 2242HDSP-U103 Datasheet

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HDSP-U113

Broadcom LimitedIn Stock: 4049HDSP-U113 Datasheet

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HDSP-U203

Broadcom LimitedIn Stock: 1212HDSP-U203 Datasheet

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HDSP-U213

Broadcom LimitedIn Stock: 2740HDSP-U213 Datasheet

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LAP-301VL

Rohm SemiconductorIn Stock: 755LAP-301VL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the NKR131SB is determined by strict alignment of the following critical parameters:

Primary Compatibility Criteria:

• Display type: 7-Segment LED (single character)
• Common pin configuration: Common Cathode
• Color: Red
• Package: 10-DIP form factor
• Digit height: 0.31" (8.00mm)
• Physical dimensions: Compatible with 11.00mm × 7.00mm × 5.00mm envelope

Secondary Electrical Parameters:

• Forward voltage (Vf): 1.7V to 2.0V range acceptable
• Test current: 5mA to 20mA range acceptable
• Brightness (mcd): 2.8mcd minimum
• Wavelength: 635nm to 660nm range acceptable

Substitute parts are grouped into two categories based on electrical performance:

Group 1 - Lower Power Variants (HDSP-U103, HDSP-U113): Operate at 1.7V with 5mA test current, delivering 3.6mcd brightness. These are direct functional equivalents with reduced power consumption.

Group 2 - Higher Performance Variants (HDSP-U203, HDSP-U213): Operate at 2.0V with 20mA test current, delivering 5.39mcd brightness. These provide increased brightness for applications requiring higher visibility.

Group 3 - High Brightness Variant (LAP-301VL): Operates at 1.9V with 10mA test current, delivering 36mcd brightness. This part offers significantly enhanced brightness performance while maintaining similar electrical operating point to the original.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement with Reduced Power Consumption:

HDSP-U103 (Bulk packaging) and HDSP-U113 (Tube packaging) are functionally equivalent to the NKR131SB with identical forward voltage (1.7V) and reduced test current (5mA vs. 10mA). Both parts are manufactured by Broadcom Limited and carry Active product status with ROHS3 compliance. These parts are suitable for applications where power consumption reduction is beneficial and brightness increase from 2.8mcd to 3.6mcd is acceptable. The 645nm wavelength represents a minor shift from the original 660nm but remains within the red spectrum. Packaging selection between Bulk (HDSP-U103) and Tube (HDSP-U113) depends on procurement and handling requirements.

For Enhanced Brightness Applications:

HDSP-U203 (Bulk packaging) and HDSP-U213 (Bulk packaging) operate at 2.0V with 20mA test current, delivering 5.39mcd brightness. These parts are suitable for applications requiring increased display visibility. Higher power dissipation (105mW vs. 40mW) and increased current draw must be accommodated in circuit design. Both parts are Active status with ROHS3 compliance. The 635nm wavelength provides a slightly more orange-red appearance compared to the original 660nm.

For Maximum Brightness Performance:

LAP-301VL manufactured by Rohm Semiconductor delivers 36mcd brightness at 1.9V with 10mA test current, representing a 12.8× brightness increase over the NKR131SB. This part is suitable for applications requiring high visibility in bright ambient conditions or where display legibility is critical. Power dissipation reaches 448mW, requiring careful thermal management. The 10-DIP package has a larger pitch (0.300", 7.62mm vs. 0.209", 5.30mm), necessitating PCB layout verification. Moisture Sensitivity Level is MSL 3 (168 Hours), requiring controlled storage and handling. Active product status with ROHS3 compliance is confirmed.

Compliance and Regulatory Considerations:

All substitute parts maintain REACH Unaffected status and EAR99 ECCN classification, matching the original part's regulatory profile. All active substitutes are ROHS3 compliant. The LAP-301VL requires MSL 3 handling procedures, while Broadcom parts require only MSL 1 handling.

Frequently Asked Questions (FAQ)

Q: Can HDSP-U103 or HDSP-U113 be used as direct pin-for-pin replacements for NKR131SB?

A: Yes. Both parts share identical 10-DIP (0.209", 5.30mm) package configuration, common cathode pinout, and 0.31" digit height. Physical dimensions are compatible (11.00mm × 7.10mm × 5.00mm vs. 11.00mm × 7.00mm × 5.00mm). Forward voltage is identical at 1.7V. The primary difference is reduced test current (5mA vs. 10mA), which lowers power dissipation from 40mW to 37mW. No circuit modifications are required for substitution.

Q: What is the difference between HDSP-U103 and HDSP-U113?

A: Both parts are electrically and functionally identical. The difference is packaging: HDSP-U103 is supplied in Bulk packaging, while HDSP-U113 is supplied in Tube packaging. Selection depends on procurement quantity, handling procedures, and storage requirements.

Q: Can HDSP-U203 or HDSP-U213 be used as direct replacements?

A: These parts share the same 10-DIP package and pinout but operate at 2.0V (vs. 1.7V) with 20mA test current (vs. 10mA). Circuit design must accommodate the higher voltage and current requirements. Power dissipation increases to 105mW. Brightness increases to 5.39mcd. These parts are suitable for applications where increased brightness is required and circuit design can support higher electrical demands.

Q: What is the difference between HDSP-U203 and HDSP-U213?

A: Both parts are electrically and functionally identical. The difference is packaging: HDSP-U203 is supplied in Bulk packaging, while HDSP-U213 is supplied in Bulk packaging. Both are available in equivalent quantities.

Q: Is LAP-301VL a direct replacement for NKR131SB?

A: LAP-301VL is functionally compatible but not a direct pin-for-pin replacement. The 10-DIP package has a larger pitch (0.300", 7.62mm vs. 0.209", 5.30mm), requiring PCB layout modification. Forward voltage is 1.9V (vs. 1.7V) and test current is 10mA (matching the original). Brightness is significantly higher at 36mcd. This part is suitable for redesigns where increased brightness and modified PCB layout are acceptable.

Q: What are the wavelength differences between substitute parts?

A: NKR131SB operates at 660nm (deep red). HDSP-U103 and HDSP-U113 operate at 645nm (red). HDSP-U203 and HDSP-U213 operate at 635nm (orange-red). LAP-301VL operates at 650nm (red). All wavelengths remain within the red spectrum. Visual color differences may be perceptible in side-by-side comparison but are generally acceptable for most applications.

Q: What are the brightness differences?

A: NKR131SB delivers 2.8mcd. HDSP-U103 and HDSP-U113 deliver 3.6mcd (1.3× brighter). HDSP-U203 and HDSP-U213 deliver 5.39mcd (1.9× brighter). LAP-301VL delivers 36mcd (12.8× brighter). Selection depends on ambient lighting conditions and required display legibility.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts (HDSP-U103, HDSP-U113, HDSP-U203, HDSP-U213, LAP-301VL) are ROHS3 compliant. The original NKR131SB RoHS status is not specified due to its obsolete status.

Q: What is the Moisture Sensitivity Level (MSL) for each part?

A: HDSP-U103, HDSP-U113, HDSP-U203, and HDSP-U213 have MSL 1 (Unlimited), requiring standard handling. LAP-301VL has MSL 3 (168 Hours), requiring controlled storage at specified temperature and humidity, with a 168-hour floor life limit after bag opening. MSL 3 handling procedures must be implemented for LAP-301VL.

Q: Which substitute part should be selected for new designs?

A: Selection depends on application requirements. For power-sensitive applications with standard brightness requirements, select HDSP-U103 or HDSP-U113. For applications requiring increased brightness with higher power budget, select HDSP-U203 or HDSP-U213. For applications requiring maximum brightness and where PCB layout modification is acceptable, select LAP-301VL. All parts are Active status with confirmed availability.