WP424HDT LED RED DIFFUSED T-1 T/H Equivalent & Substitute Parts

Part Overview

The WP424HDT is a red diffused T-1 through-hole LED manufactured by Kingbright, specified for discrete LED indication applications. This component features a 635nm dominant wavelength, 2.25V forward voltage, and 0.6mcd brightness rating with a 100° viewing angle. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain compatibility with through-hole mounting, T-1 form factor, and red diffused lens specifications while accommodating variations in electrical performance parameters.

Key Parameters

Parameter	WP424HDT Value	Unit
Lens Size	3mm, T-1	-
Lens Transparency	Diffused	-
Color	Red	-
Mounting Type	Through Hole	-
Package / Case	Radial	-
Voltage - Forward (Vf) (Typ)	2.25	V
Current - Test	20	mA
Wavelength - Dominant	635	nm
Millicandela Rating	0.6	mcd
Viewing Angle	100	°
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the WP424HDT is determined by strict adherence to the following parameters:

Primary Compatibility Criteria:

Lens Size: 3mm, T-1 form factor
Lens Transparency: Diffused
Color: Red
Mounting Type: Through Hole
Package / Case: Radial

Secondary Electrical Parameters:

Voltage - Forward (Vf) (Typ): Range 1.7V to 5V
Current - Test: Range 2mA to 20mA
Wavelength - Peak: Range 625nm to 700nm
Millicandela Rating: 0.6mcd to 40mcd
Viewing Angle: 35° to 100°

All substitute parts listed maintain the primary compatibility criteria. Variations in secondary electrical parameters are acceptable provided the substitute part operates within standard circuit design tolerances and the application circuit accommodates the different forward voltage and current specifications.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ) [V]	Current - Test [mA]	Wavelength - Peak [nm]	Millicandela [mcd]	Viewing Angle [°]	Height (Max) [mm]	Product Status	RoHS Status
WP424HDT	Kingbright	2.25	20	700	0.6	100	6.00	Obsolete	ROHS3 Compliant
3HD-F	Bivar Inc.	2.0	20	625	30	35	5.30	Active	ROHS3 Compliant
3SRD-S	Bivar Inc.	1.7	20	645	40	40	4.50	Active	ROHS3 Compliant
4300F1LC	Visual Communications Company - VCC	1.8	2	635	1.8	50	6.35	Not For New Designs	ROHS3 Compliant
HLMP-1301-G00FG	Broadcom Limited	1.9	10	635	8.6	60	6.35	Active	ROHS3 Compliant
HLMP-1600	Broadcom Limited	5.0	10	635	2.1	60	6.35	Active	ROHS3 Compliant
HLMP-1600-D00A1	Broadcom Limited	5.0	10	635	2.1	60	-	Active	ROHS3 Compliant
HLMP-1600-D00A2	Broadcom Limited	5.0	10	635	2.1	60	-	Active	ROHS3 Compliant
HLMP-1601	Broadcom Limited	12.0	13	635	2.1	60	6.35	Active	ROHS3 Compliant
HLMP-1700	Broadcom Limited	1.7	2	635	2.1	50	6.35	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Active Product Status Priority:

The following substitute parts maintain active product status and ROHS3 compliance:

HLMP-1700 (Broadcom Limited): Active status with 1.7V forward voltage, 2.1mcd brightness, and 50° viewing angle. Suitable for low-voltage applications with reduced brightness requirements.
HLMP-1301-G00FG (Broadcom Limited): Active status with 1.9V forward voltage, 8.6mcd brightness, and 60° viewing angle. Intermediate brightness option for standard indication applications.
HLMP-1600 (Broadcom Limited): Active status with 5V forward voltage and 2.1mcd brightness. Suitable for higher voltage circuit designs with 60° viewing angle.
HLMP-1601 (Broadcom Limited): Active status with 12V forward voltage and 2.1mcd brightness. Designed for high-voltage applications with 60° viewing angle.
3SRD-S (Bivar Inc.): Active status with 1.7V forward voltage and 40mcd brightness. Highest brightness option among low-voltage substitutes with 40° viewing angle.
3HD-F (Bivar Inc.): Active status with 2.0V forward voltage and 30mcd brightness. Moderate brightness option with 35° viewing angle.

For Compatibility with Existing Designs:

The 4300F1LC (Visual Communications Company - VCC) maintains mechanical compatibility but carries "Not For New Designs" status. This part is suitable only for replacement in existing production runs where design changes are not feasible.

Compliance Considerations:

All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original WP424HDT specifications.

Frequently Asked Questions (FAQ)

Q: Can the WP424HDT be directly replaced with any of the listed substitute parts?

A: Direct replacement depends on circuit design parameters. All substitute parts maintain the 3mm T-1 through-hole radial form factor and diffused red lens specifications. However, forward voltage and current requirements differ. Circuit designs must accommodate the specific forward voltage of the selected substitute part. For example, the HLMP-1600 operates at 5V, while the HLMP-1700 operates at 1.7V. The application circuit must be verified for compatibility with the substitute part's electrical specifications.

Q: What is the primary difference between the Bivar Inc. substitutes (3HD-F and 3SRD-S) and the Broadcom Limited substitutes?

A: The Bivar Inc. parts (3HD-F and 3SRD-S) offer significantly higher brightness ratings (30mcd and 40mcd respectively) compared to Broadcom Limited parts (2.1mcd to 8.6mcd). The Bivar parts feature domed lens tops, while the WP424HDT has a flat top. Bivar parts also have narrower viewing angles (35° to 40°) compared to the WP424HDT (100°). Selection depends on brightness and viewing angle requirements of the application.

Q: Why are HLMP-1600-D00A1 and HLMP-1600-D00A2 listed separately from HLMP-1600?

A: HLMP-1600-D00A1 and HLMP-1600-D00A2 are right-angle through-hole variants of the HLMP-1600 base part. These variants are designed for circuit board mounting at 90 degrees to the board surface, whereas the standard HLMP-1600 is mounted radially (leads perpendicular to the board). Selection between radial and right-angle mounting depends on PCB layout requirements.

Q: Is the 4300F1LC suitable for new designs?

A: The 4300F1LC carries a "Not For New Designs" product status. This part is suitable only for replacement in existing production runs or legacy systems where design modifications are not feasible. For new designs, select from parts with "Active" product status.

Q: How do I select between the different Broadcom Limited voltage options (HLMP-1600, HLMP-1601, HLMP-1700)?

A: Selection is determined by the available supply voltage in the application circuit. HLMP-1700 operates at 1.7V for low-voltage applications. HLMP-1600 operates at 5V for standard logic-level circuits. HLMP-1601 operates at 12V for higher voltage systems. All three parts maintain identical 2.1mcd brightness and 60° viewing angle specifications. Choose the part matching your circuit's supply voltage.

Q: What viewing angle should I consider when selecting a substitute?

A: The WP424HDT provides a 100° viewing angle, the widest among all listed substitutes. If the application requires wide-angle visibility, the WP424HDT's 100° specification cannot be matched by any substitute. The Bivar Inc. parts offer 35° to 40° viewing angles, while Broadcom Limited parts offer 50° to 60° viewing angles. Narrower viewing angles concentrate brightness in a specific direction, which may be advantageous for focused indication applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original WP424HDT specifications.

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