LN31GCPH Equivalent & Substitute Parts

Part Overview

The LN31GCPH is a green LED indicator manufactured by Panasonic Electronic Components, designed for through-hole mounting applications. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production support and design continuity. The part features a 5mm round lens with domed top, 2.2V forward voltage, and 20mcd brightness rating, suitable for standard indication applications requiring green light output at 565nm peak wavelength.

Substiute Parts

LN31GCPH

Panasonic Electronic ComponentsIn Stock: 953LN31GCPH Datasheet

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SLA-570MT3F

Rohm SemiconductorIn Stock: 69147SLA-570MT3F Datasheet

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SLR-56MC3F

Rohm SemiconductorIn Stock: 12414SLR-56MC3F Datasheet

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WP7113GT

KingbrightIn Stock: 25129WP7113GT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the LN31GCPH is determined by the following critical parameters:

• Lens Size & Mounting: All substitutes must maintain 5mm T-1 3/4 form factor with through-hole radial mounting to ensure mechanical compatibility with existing PCB layouts
• Color & Wavelength: Green color specification with peak wavelength in the 563–572nm range maintains functional equivalence for indication purposes
• Electrical Characteristics: Forward voltage (Vf) range of 2.1–2.3V and test current of 10–20mA ensure circuit compatibility with standard LED driver designs
• Brightness: Millicandela ratings from 20mcd to 470mcd accommodate various visibility requirements while maintaining the same optical form factor
• Environmental Compliance: MSL 1 (Unlimited) and RoHS3 compliance across all substitutes ensure reliability and regulatory alignment

Three substitute parts meet these criteria: SLA-570MT3F (Rohm Semiconductor), SLR-56MC3F (Rohm Semiconductor), and WP7113GT (Kingbright).

Parameter Comparison

Engineering Selection Recommendations

WP7113GT (Kingbright) is the primary substitute for new applications and ongoing production. This part maintains active product status, ensuring long-term availability and manufacturer support. It matches the original LN31GCPH in forward voltage (2.2V), test current (20mA), and peak wavelength (565nm), providing direct electrical and optical equivalence. RoHS3 compliance and MSL 1 rating confirm environmental and reliability standards alignment.

SLA-570MT3F (Rohm Semiconductor) serves as a secondary substitute where higher brightness (470mcd) is acceptable. The 2.3V forward voltage and 20mA test current remain within standard circuit tolerance ranges. However, this part carries "Not For New Designs" status, limiting its use to legacy system support.

SLR-56MC3F (Rohm Semiconductor) is suitable only when reduced test current (10mA) is required for power-constrained applications. The 2.1V forward voltage and 40mcd brightness differ from the original specification. This part also carries "Not For New Designs" status and should be reserved for specific legacy applications where the lower current requirement provides system-level benefits.

Frequently Asked Questions (FAQ)

Q: Can WP7113GT directly replace LN31GCPH without circuit modification?

A: Yes. WP7113GT matches the critical electrical parameters: 2.2V forward voltage, 20mA test current, and 565nm peak wavelength. The identical 5mm T-1 3/4 through-hole radial package ensures mechanical compatibility. No circuit redesign is required.

Q: Why does SLA-570MT3F have significantly higher brightness (470mcd vs. 20mcd)?

A: SLA-570MT3F uses a different LED die and optical design optimized for higher light output. While mechanically and electrically compatible, the increased brightness may affect visual perception in the application. Verify that the higher brightness does not cause unintended visual effects or power dissipation concerns in the target circuit.

Q: Is SLR-56MC3F suitable for standard 20mA LED driver circuits?

A: SLR-56MC3F operates at 10mA test current, half the original specification. While the 2.1V forward voltage remains compatible with most LED driver designs, the part will produce reduced brightness (40mcd) at standard 20mA operation. Use this substitute only when the application specifically requires lower current consumption or when brightness reduction is acceptable.

Q: What is the significance of "Not For New Designs" status on Rohm parts?

A: "Not For New Designs" indicates that the manufacturer no longer recommends these parts for new product development, though they remain available for legacy system support. For new designs, WP7113GT (Active status) is the preferred choice to ensure long-term supply continuity and manufacturer support.

Q: Are all substitutes RoHS3 compliant?

A: Yes. SLA-570MT3F, SLR-56MC3F, and WP7113GT all carry RoHS3 Compliant certification, meeting current environmental and regulatory requirements. The original LN31GCPH does not specify RoHS status due to its obsolete classification.

Q: Do the height differences (8.60mm to 8.90mm) affect PCB layout compatibility?

A: The height variations fall within standard through-hole component tolerance ranges and do not affect PCB layout compatibility. All parts maintain the 5mm T-1 3/4 form factor and radial mounting configuration, ensuring mechanical fit in existing designs.