WP57YYD Yellow LED T-1 3/4 Through Hole Equivalent & Substitute Parts

Part Overview

The WP57YYD is a yellow diffused LED manufactured by Kingbright, designed for indication applications in through-hole mounting configurations. This component features a 5mm T-1 3/4 lens form factor with a dominant wavelength of 588nm and a typical forward voltage of 2.1V at 20mA test current. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts become necessary when the WP57YYD reaches end-of-life status, inventory depletion, or when design requirements permit operation within the electrical and mechanical tolerances of alternative yellow LED indicators sharing the same form factor and functional specifications.

Substiute Parts

WP57YYD

KingbrightIn Stock: 1153WP57YYD Datasheet

Current PartRFQ

MV6351

onsemiIn Stock: 824MV6351 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the WP57YYD is based on strict alignment of the following parameters:

Critical Substitution Parameters:

• Lens size and form factor (5mm T-1 3/4)
• Mounting type (Through Hole Radial)
• Lens color and transparency (Yellow Diffused)
• Wavelength range (Yellow spectrum, 585-590nm acceptable)
• Regulatory compliance (RoHS3, REACH Unaffected, EAR99)

Acceptable Variation Parameters:

• Forward voltage (Vf): ±0.1V tolerance acceptable within circuit design margins
• Millicandela rating: ±2mcd acceptable for indication applications
• Viewing angle: ±10° acceptable depending on application requirements
• Height: ±0.3mm acceptable within standard PCB clearance

Non-Substitutable Parameters:

• Lens size and form factor
• Mounting type
• Color and wavelength
• Regulatory compliance status

The MV6351 from onsemi qualifies as a substitute based on matching all critical parameters while remaining within acceptable variation ranges for electrical and optical characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: WP57YYD (Kingbright)

The WP57YYD maintains Active product status with confirmed RoHS3 compliance and unlimited moisture sensitivity rating. This part is suitable for new designs and applications requiring long-term supply assurance. Current inventory of 1,059 pieces supports production requirements.

Substitute Selection: MV6351 (onsemi)

The MV6351 qualifies as a functional substitute for existing designs where component replacement is necessary. The part meets all critical mechanical and optical parameters with acceptable electrical variation. However, the Obsolete product status indicates limited future availability. The MV6351 is suitable only for repair, rework, or legacy system maintenance where design modification is not feasible.

Compliance Considerations:

Both parts carry EAR99 ECCN classification and REACH Unaffected status. The WP57YYD provides verified ROHS3 compliance documentation. When substituting the MV6351, verify RoHS compliance status with the supplier before implementation in regulated applications.

Electrical Design Margin:

The forward voltage difference of 0.1V (2.1V vs 2.2V) requires verification of circuit current-limiting resistor values. Recalculate series resistor values if the MV6351 is substituted to maintain 20mA nominal operating current.

Frequently Asked Questions (FAQ)

Q: Can the MV6351 be used as a direct replacement for the WP57YYD in existing PCB designs?

A: The MV6351 is mechanically and optically compatible with the WP57YYD. Both parts share identical 5mm T-1 3/4 form factor, through-hole radial mounting, and 12mcd brightness rating. Electrical circuit verification is required due to the 0.1V forward voltage difference. Recalculate series resistor values to maintain 20mA operating current.

Q: What is the difference in viewing angle between these parts?

A: The WP57YYD specifies 60° viewing angle while the MV6351 specifies 70°. The 10° difference means the MV6351 provides wider light distribution. For applications requiring specific viewing angle constraints, verify that the wider angle does not cause unintended light spillage or cross-talk in multi-LED indicator arrays.

Q: Are there compliance differences between WP57YYD and MV6351?

A: The WP57YYD carries verified ROHS3 compliance documentation. The MV6351 RoHS status is not specified in available data. Both parts are REACH Unaffected and carry EAR99 ECCN classification. For regulated applications, obtain RoHS compliance documentation from onsemi before substituting the MV6351.

Q: What is the wavelength difference and does it affect color perception?

A: The WP57YYD specifies 590nm peak wavelength while the MV6351 specifies 585nm peak wavelength. Both wavelengths fall within the yellow spectrum (570-590nm range). The 5nm difference is not perceptible to human vision in indication applications. Color matching in multi-LED indicator arrays may show minor variation under controlled spectral analysis.

Q: Why is the MV6351 listed as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued production and removed the part from active distribution. The MV6351 remains available through existing inventory channels but future availability is not guaranteed. For new designs, the WP57YYD is the recommended selection due to Active status and confirmed long-term availability.

Q: Can I use the MV6351 in new product designs?

A: The MV6351 is not recommended for new designs due to Obsolete product status. Use the WP57YYD for new development to ensure supply continuity and long-term component availability. The MV6351 is suitable only for repair, rework, or legacy system maintenance.

Q: What is the height difference and does it affect PCB clearance?

A: The WP57YYD maximum height is 8.60mm while the MV6351 maximum height is 8.89mm. The 0.29mm difference is within standard PCB clearance tolerances. Verify clearance in applications with tight vertical space constraints, such as low-profile enclosures or stacked PCB assemblies.