Dialight 5510309 LED Circuit Board Indicator - Equivalent & Substitute Parts

Part Overview

The Dialight 5510309 is a 3mm yellow LED circuit board indicator designed for through-hole, right-angle mounting applications. This component features a diffused, tinted lens with a round domed top and operates at 2.1V with 10mA current consumption, delivering 6.3mcd brightness at a 45° viewing angle. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Active alternatives within the Dialight 551 series and compatible cross-manufacturer options are available to maintain design functionality.

Key Parameters

Parameter	Value
Manufacturer	Dialight
Series	551
Color	Yellow
Wavelength - Peak	585nm
Configuration	Single
Current	10mA
Millicandela Rating	6.3mcd
Viewing Angle	45°
Lens Type	Diffused, Tinted
Lens Style	Round with Domed Top
Lens Size	3mm, T-1
Voltage Rating	2.1V
Mounting Type	Through Hole, Right Angle
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the Dialight 5510309 is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria (Must Match):

Color: Yellow
Configuration: Single
Lens Type: Diffused, Tinted
Mounting Type: Through Hole, Right Angle
Lens Size: 3mm, T-1
Voltage Rating: 2.1V
Current: 10mA
Millicandela Rating: 6.3mcd

Secondary Substitution Criteria (Preferred Match):

Wavelength - Peak: 585nm
Viewing Angle: 45°
Product Status: Active (preferred for new designs)
RoHS Compliance: ROHS3 Compliant

Dialight 551 series parts 5510302803F, 5510303F, 5510307010F, 5510307F, 5510309F, and 5510311F meet all primary criteria and are direct functional equivalents. The Kingbright WP934AD/YD is classified as a similar part due to differences in current (30mA vs. 10mA), voltage (1.95V vs. 2.1V), and millicandela rating (15mcd vs. 6.3mcd), making it suitable only for applications where these parameter variations are acceptable.

Parameter Comparison

Part Number	Manufacturer	Color	Wavelength (nm)	Current (mA)	Voltage (V)	Millicandela (mcd)	Viewing Angle	Lens Style	Mounting	Product Status	RoHS Status
5510309	Dialight	Yellow	585	10	2.1	6.3	45°	Round Domed Top	Through Hole, Right Angle	Obsolete	REACH Unaffected
5510302803F	Dialight	Yellow	585	10	2.1	6.3	—	Round Domed Top	Through Hole, Right Angle	Active	ROHS3 Compliant
5510303F	Dialight	Yellow	585	10	2.1	6.3	—	Round Domed Top	Through Hole, Right Angle	Active	ROHS3 Compliant
5510307010F	Dialight	Yellow	585	10	2.1	6.3	45°	Round Domed Top	Through Hole, Right Angle	Active	ROHS3 Compliant
5510307F	Dialight	Yellow	585	10	2.1	6.3	45°	Round Domed Top	Through Hole, Right Angle	Active	ROHS3 Compliant
5510309F	Dialight	Yellow	585	10	2.1	6.3	45°	—	Through Hole, Right Angle	Active	ROHS3 Compliant
5510311F	Dialight	Yellow	585	10	2.1	6.3	45°	Round Domed Top	Through Hole, Right Angle	Active	ROHS3 Compliant
WP934AD/YD	Kingbright	Yellow	588	30	1.95	15	40°	Round Domed Top	Through Hole, Right Angle	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Dialight 551 Series - Active Status):

Parts 5510307F, 5510307010F, 5510311F, and 5510309F are active production equivalents with full parameter alignment to the obsolete 5510309. These parts carry ROHS3 compliance certification and maintain identical electrical and optical specifications. Selection among these active alternatives depends on packaging requirements and inventory availability.

Parts 5510302803F and 5510303F are functionally equivalent with identical electrical and optical parameters but lack specified viewing angle data in available documentation. These parts are suitable for applications where viewing angle specification is not critical.

Cross-Manufacturer Alternative (Kingbright WP934AD/YD):

The Kingbright WP934AD/YD operates at different electrical parameters: 30mA current (versus 10mA), 1.95V voltage (versus 2.1V), and delivers 15mcd brightness (versus 6.3mcd). This part is suitable only for circuit designs that accommodate these parameter variations and can tolerate the 40° viewing angle (versus 45°). Use of this cross-manufacturer part requires circuit re-evaluation and validation.

Frequently Asked Questions (FAQ)

Q: Can I directly replace Dialight 5510309 with any of the active Dialight 551 series parts?

A: Yes. Parts 5510307F, 5510307010F, 5510311F, and 5510309F are direct functional equivalents with identical electrical specifications (2.1V, 10mA, 6.3mcd) and mechanical mounting. These parts are suitable for direct substitution in existing designs without circuit modification.

Q: What is the difference between 5510307F and 5510311F?

A: Both parts meet all primary substitution criteria with identical electrical and optical parameters. Differences exist only in base product numbering and internal Dialight product line designation. Selection between these parts should be based on packaging availability and supplier inventory.

Q: Can I use the Kingbright WP934AD/YD as a direct replacement?

A: No. The Kingbright part operates at 30mA current and 1.95V voltage, differing from the 5510309 specification of 10mA and 2.1V. Additionally, it delivers 15mcd brightness versus 6.3mcd. This part requires circuit re-design and validation before use.

Q: What does "viewing angle" mean in LED specifications?

A: Viewing angle defines the cone of light emission from the LED. The 5510309 specifies 45°, meaning brightness is maintained within a 45-degree cone from the optical axis. Parts with unspecified viewing angles may have different light distribution characteristics.

Q: Are all substitute parts RoHS compliant?

A: All active Dialight 551 series substitutes (5510307F, 5510307010F, 5510311F, 5510309F, 5510302803F, 5510303F) carry ROHS3 compliance certification. The Kingbright WP934AD/YD also meets ROHS3 requirements. The obsolete 5510309 is classified as REACH Unaffected.

Q: What packaging options are available?

A: Dialight 551 series substitutes are supplied in bulk packaging. The Kingbright WP934AD/YD is supplied in bag packaging. Packaging selection may affect minimum order quantities and logistics considerations.

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