SC39-11SRWA 7-Segment LED Display Equivalent & Substitute Parts

Part Overview

The SC39-11SRWA is a 0.39-inch single-character red 7-segment LED display manufactured by Kingbright in a 10-DIP package configuration. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The display operates as a common cathode device with a typical forward voltage of 1.85V and test current of 20mA, suitable for numeric display applications requiring compact form factors.

Substiute Parts

SC39-11SRWA

KingbrightIn Stock: 809SC39-11SRWA Datasheet

Current PartRFQ

SC39-11SURKWA

KingbrightIn Stock: 1720SC39-11SURKWA Datasheet

MFR RecommendedRFQ

HDSP-313A

Broadcom LimitedIn Stock: 1246HDSP-313A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SC39-11SRWA is determined by the following critical parameters:

Primary Compatibility Criteria:

• Display type: 7-Segment LED
• Character configuration: Single character
• Common pin type: Common Cathode
• Package: 10-DIP (0.300", 7.62mm)
• Color: Red
• Test current: 20mA

Secondary Compatibility Criteria:

• Forward voltage tolerance: ±0.10V variation acceptable
• Digit size: 0.39" to 0.40" (10.00mm to 10.16mm)
• Physical dimensions: Height and width within ±0.008" tolerance
• Compliance certifications: ROHS3, MSL 1

The SC39-11SURKWA (Kingbright, Active status) qualifies as a manufacturer-recommended substitute with identical package, pinout, and electrical operating parameters. The HDSP-313A (Broadcom Limited, Active status) qualifies as a similar substitute with compatible package and electrical characteristics, though with minor dimensional and performance variations.

Parameter Comparison

Engineering Selection Recommendations

SC39-11SURKWA (Kingbright) - Primary Substitute

The SC39-11SURKWA is the manufacturer-recommended substitute for the obsolete SC39-11SRWA. Both parts share identical package geometry, pinout configuration, and mechanical dimensions. The SC39-11SURKWA maintains active product status with higher brightness output (46mcd versus 17mcd) and forward voltage of 1.95V, representing a 0.10V increase within acceptable operating tolerance. Maximum power dissipation remains at 75mW. This substitute provides direct compatibility with existing PCB layouts and requires no circuit modifications. ROHS3 compliance and MSL 1 rating are maintained.

HDSP-313A (Broadcom Limited) - Alternative Substitute

The HDSP-313A qualifies as a compatible alternative when SC39-11SURKWA availability is constrained. This Broadcom device maintains identical 10-DIP package pinout and common cathode configuration. Physical dimensions show minor variation: height 0.504" (versus 0.512"), width 0.382" (versus 0.394"), with depth unchanged at 0.276". Forward voltage matches the original part at 1.85V. Brightness output is lower at 7.5mcd, and maximum power dissipation is reduced to 30mW. The HDSP-313A is suitable for applications where lower brightness and reduced power consumption are acceptable. ROHS3 compliance and MSL 1 rating are maintained.

Both substitutes are active products with established supply chains and full compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can SC39-11SURKWA be used as a direct replacement for SC39-11SRWA without PCB modifications?

A: Yes. The SC39-11SURKWA maintains identical 10-DIP package pinout, common cathode configuration, and physical dimensions as the SC39-11SRWA. No PCB layout changes are required. The forward voltage increase from 1.85V to 1.95V is within standard operating tolerance and does not require circuit redesign.

Q: What are the brightness differences between the three parts?

A: The SC39-11SRWA provides 17mcd brightness, the SC39-11SURKWA provides 46mcd brightness, and the HDSP-313A provides 7.5mcd brightness. Selection depends on application visibility requirements. The SC39-11SURKWA offers the highest brightness output.

Q: Are there mechanical compatibility concerns with the HDSP-313A?

A: The HDSP-313A has minor dimensional variations: height 0.504" (versus 0.512") and width 0.382" (versus 0.394"). These differences are within typical PCB mounting tolerances for 10-DIP packages. Verify clearance in your specific application layout, particularly if space constraints exist around the display component.

Q: Do all three parts require the same forward voltage in circuit design?

A: No. The SC39-11SRWA and HDSP-313A both operate at 1.85V typical forward voltage, while the SC39-11SURKWA operates at 1.95V typical. Current-limiting resistor values should be recalculated if switching between the SC39-11SURKWA and the other two parts to maintain consistent segment brightness and current draw.

Q: What is the wavelength difference between the parts?

A: The SC39-11SRWA and HDSP-313A both emit at 660nm peak wavelength (standard red). The SC39-11SURKWA emits at 645nm peak wavelength (amber-red). This difference may be visible in applications where color consistency is critical across multiple displays.

Q: Are all three parts RoHS and MSL compliant?

A: Yes. All three parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special moisture control measures are required during storage or handling.

Q: Which substitute should be selected for new designs?

A: The SC39-11SURKWA is recommended for new designs due to its active product status, higher brightness output, and manufacturer recommendation. The HDSP-313A serves as a secondary option when SC39-11SURKWA supply is unavailable.