HLMP-N305 Yellow LED T-1 Equivalent & Substitute Parts

Part Overview

The HLMP-N305 is a yellow 585nm LED indicator in T-1 through-hole package manufactured by Broadcom Limited. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The HLMP-N305 delivers 14.7mcd at 2V forward voltage with a 45° viewing angle in a 3mm clear lens configuration.

Key Parameters

Parameter	Value
Color	Yellow
Wavelength - Dominant	585nm
Voltage - Forward (Vf) (Typ)	2V
Current - Test	10mA
Millicandela Rating	14.7mcd
Lens Size	3mm, T-1
Lens Transparency	Clear
Viewing Angle	45°
Mounting Type	Through Hole
Package / Case	Radial

Substitute Part Grouping Explanation

Substitution eligibility for the HLMP-N305 is determined by the following critical parameters: color (yellow), lens size (3mm T-1), mounting type (through hole radial), and wavelength range (585-588nm). Forward voltage tolerance extends to 2.1V maximum, and millicandela ratings between 10mcd and 19mcd are acceptable within standard circuit design margins. Lens transparency (clear or diffused) and viewing angle variations (45-50°) are secondary parameters that may be accommodated depending on application requirements.

The substitute parts listed below meet these core substitution criteria and are available in active production status or from current inventory.

Parameter Comparison

Parameter	HLMP-N305	HLMP-1420	HLMP-1421	LTL-4252N	SLR-322YY3F
Manufacturer	Broadcom Limited	Broadcom Limited	Broadcom Limited	Lite-On Inc.	Rohm Semiconductor
Color	Yellow	Yellow	Yellow	Yellow	Yellow
Wavelength - Dominant	585nm	585nm	585nm	588nm	587nm
Voltage - Forward (Vf) (Typ)	2V	2V	2V	2.1V	2.1V
Current - Test	10mA	10mA	10mA	10mA	10mA
Millicandela Rating	14.7mcd	15mcd	15mcd	19mcd	10mcd
Lens Size	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1	3.10mm Dia
Lens Transparency	Clear	Clear	Clear	Clear	Diffused
Viewing Angle	45°	45°	45°	45°	50°
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial	Radial
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

HLMP-1420 and HLMP-1421 are parametric equivalents manufactured by Broadcom Limited with identical electrical characteristics to the HLMP-N305. Both parts are in active production status and ROHS3 compliant, making them the primary substitutes for direct replacement in new designs and production continuity.

LTL-4252N from Lite-On Inc. is an active production alternative with slightly elevated forward voltage (2.1V) and higher millicandela rating (19mcd). This part is suitable for applications where increased brightness is acceptable and forward voltage tolerance permits the 0.1V differential.

SLR-322YY3F from Rohm Semiconductor is an active production option with diffused lens transparency and 50° viewing angle. The lower millicandela rating (10mcd) and diffused lens characteristics make this part suitable for applications requiring wider light distribution and reduced intensity.

All substitute parts maintain through-hole radial mounting compatibility, T-1 package form factor, and yellow color specification. RoHS3 compliance across all active alternatives supports modern manufacturing and environmental regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1420 or HLMP-1421 be used as direct replacements for HLMP-N305?

A: Yes. HLMP-1420 and HLMP-1421 are parametric equivalents with identical forward voltage (2V), wavelength (585nm), and test current (10mA). Both are in active production and ROHS3 compliant, making them suitable for direct substitution in circuit designs.

Q: What is the difference between HLMP-1420 and HLMP-1421?

A: Both parts share identical electrical and optical specifications. The distinction lies in manufacturing lot tracking and inventory management. Either part is functionally equivalent for circuit applications.

Q: Can LTL-4252N replace HLMP-N305 in all applications?

A: LTL-4252N operates at 2.1V forward voltage compared to HLMP-N305 at 2V. This 0.1V differential is within typical circuit design tolerance. The higher brightness (19mcd vs 14.7mcd) may affect visual perception in some applications. Circuit design must accommodate the forward voltage difference through resistor adjustment.

Q: What are the implications of using SLR-322YY3F as a substitute?

A: SLR-322YY3F features diffused lens transparency and 50° viewing angle compared to HLMP-N305 clear lens at 45°. The diffused lens produces wider light distribution with lower peak intensity (10mcd vs 14.7mcd). This part is suitable for applications requiring broader light spread and reduced brightness concentration. Forward voltage is 2.1V, requiring circuit adjustment.

Q: Are all substitute parts RoHS compliant?

A: HLMP-1420, HLMP-1421, LTL-4252N, and SLR-322YY3F are all ROHS3 compliant. The original HLMP-N305 is RoHS non-compliant. Substitution with any active production alternative satisfies modern RoHS regulatory requirements.

Q: Do all substitute parts use the same through-hole radial package?

A: Yes. All substitute parts maintain T-1 through-hole radial package configuration, ensuring mechanical and electrical compatibility with existing PCB designs and component placement equipment.

Q: What inventory status should influence part selection?

A: HLMP-1420 has the highest current inventory (25,715 pcs), followed by HLMP-1421 (11,600 pcs), LTL-4252N (6,849 pcs), and SLR-322YY3F (1,113 pcs). Inventory availability may influence procurement decisions for high-volume production requirements.

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