3RD-201 Equivalent & Substitute Parts

Part Overview

The Bivar Inc. 3RD-201 is a red diffused LED indicator with T-1 (3mm) form factor designed for through-hole mounting. This component features a 2.1V forward voltage with 2mcd brightness rating and operates at 20mA test current. The product status is obsolete, necessitating identification of equivalent and substitute components for ongoing designs and replacements. Active alternatives from multiple manufacturers maintain core functional characteristics while offering enhanced availability and compliance status.

Key Parameters

Parameter	Value
Manufacturer Part Number	3RD-201
Manufacturer	Bivar Inc.
Description	LED RED DIFFUSED T-1 T/H
Color	Red
Lens Size	3mm, T-1
Voltage - Forward (Vf) (Typ)	2.1V
Current - Test	20mA
Millicandela Rating	2mcd
Viewing Angle	35°
Mounting Type	Through Hole
Wavelength - Peak	700nm
Height (Max)	5.10mm
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution classification for the 3RD-201 is determined by the following critical electrical and mechanical parameters:

Primary Equivalence Criteria:

Color: Red
Lens Size: 3mm, T-1 form factor
Mounting Type: Through Hole, Radial configuration
Lens Style: Round with Domed Top
Lens Transparency: Diffused

Electrical Compatibility Range:

Voltage - Forward (Vf): 1.7V to 2.2V (allows operation in similar circuit topologies)
Current - Test: 2mA to 20mA (accommodates various drive configurations)
Millicandela Rating: 1.8mcd to 35mcd (brightness variations within indicator application scope)
Viewing Angle: 35° to 60° (acceptable angular distribution for indicator purposes)
Wavelength - Peak: 626nm to 700nm (maintains red spectrum designation)
Height (Max): 5.10mm to 6.35mm (compatible with standard T-1 mounting positions)

Parts are grouped as parametric equivalents when all primary criteria match the 3RD-201 specifications. Similar parts meet the primary criteria with variations in electrical parameters within the acceptable ranges noted above.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vf (Typ)	Current - Test	Millicandela Rating	Viewing Angle	Wavelength - Peak	Height (Max)	Product Status	RoHS Status
3RD-201	Bivar Inc.	2.1V	20mA	2mcd	35°	700nm	5.10mm	Obsolete	Not Specified
3RD-F	Bivar Inc.	2.1V	20mA	2mcd	35°	700nm	5.30mm	Active	ROHS3 Compliant
151031SS06000	Würth Elektronik	2.2V	20mA	35mcd	60°	650nm	5.55mm	Active	ROHS3 Compliant
4300F1LC	Visual Communications Company - VCC	1.8V	2mA	1.8mcd	50°	635nm	6.35mm	Not For New Designs	ROHS3 Compliant
HLMP-1301-G00FG	Broadcom Limited	1.9V	10mA	8.6mcd	60°	635nm	6.35mm	Active	ROHS3 Compliant
HLMP-1600	Broadcom Limited	5V	10mA	2.1mcd	60°	635nm	6.35mm	Active	ROHS3 Compliant
HLMP-1600-D00A1	Broadcom Limited	5V	10mA	2.1mcd	60°	635nm	Not Specified	Active	ROHS3 Compliant
HLMP-1600-D00A2	Broadcom Limited	5V	10mA	2.1mcd	60°	635nm	Not Specified	Active	ROHS3 Compliant
HLMP-1601	Broadcom Limited	12V	13mA	2.1mcd	60°	635nm	6.35mm	Active	ROHS3 Compliant
HLMP-1700	Broadcom Limited	1.7V	2mA	2.1mcd	50°	635nm	6.35mm	Active	ROHS3 Compliant
HLMP-1700-B0002	Broadcom Limited	1.7V	2mA	2.1mcd	50°	635nm	6.35mm	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent): The 3RD-F (Bivar Inc.) provides the most direct replacement for the obsolete 3RD-201. This component maintains identical electrical specifications (2.1V Vf, 20mA test current, 2mcd brightness) and mechanical form factor (3mm T-1 lens, round domed diffused). The 3RD-F carries Active product status and ROHS3 compliance, removing obsolescence concerns while preserving circuit compatibility.

Active Alternatives for Electrical Compatibility: When 2.1V forward voltage operation is required:

151031SS06000 (Würth Elektronik): Maintains 2.2V Vf and 20mA test current with enhanced brightness (35mcd) and wider viewing angle (60°). Offers ROHS3 compliance and established inventory levels.

When lower voltage operation is acceptable:

HLMP-1700 and HLMP-1700-B0002 (Broadcom Limited): Both support 1.7V Vf operation with 2mA test current and 2.1mcd brightness. Available with ROHS3 compliance and established supply chain presence.
HLMP-1301-G00FG (Broadcom Limited): Operates at 1.9V Vf with 10mA test current. Offers 8.6mcd brightness and 60° viewing angle with ROHS3 compliance and Active status.

When higher voltage operation is required:

HLMP-1600 (Broadcom Limited): Designed for 5V operation with 10mA test current and 2.1mcd brightness. Suitable for 5V indicator circuits requiring radial configuration.
HLMP-1600-D00A1 and HLMP-1600-D00A2 (Broadcom Limited): 5V variants with right-angle mounting configuration for circuit board indicator applications.
HLMP-1601 (Broadcom Limited): Supports 12V operation with 13mA test current for high-voltage indicator circuits.

Avoid for New Designs: The 4300F1LC (VCC) carries Not For New Designs status and should not be selected for development projects despite ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I use any red diffused 3mm T-1 LED as a substitute for the 3RD-201? A: No. Substitution requires matching specific electrical parameters within defined ranges. The 3RD-201 operates at 2.1V forward voltage with 20mA test current. Components with significantly different voltage ratings (such as 5V or 12V variants) require different circuit designs and are not direct substitutes despite identical form factors.

Q: What is the difference between the 3RD-201 and its direct replacement 3RD-F? A: Both components share identical electrical specifications (2.1V Vf, 20mA, 2mcd, 700nm peak wavelength). The primary differences are product status (3RD-201 is obsolete; 3RD-F is active) and packaging (3RD-F available in bulk with ROHS3 compliance). The 3RD-F represents the active continuation of this product line.

Q: Why do some substitute parts have different forward voltages? A: The 3RD-201 family includes variants designed for different circuit topologies and supply voltages. Components like HLMP-1700 (1.7V), HLMP-1600 (5V), and HLMP-1601 (12V) serve distinct applications. Voltage-rated parts must be selected based on the circuit's supply voltage to ensure proper operation and component longevity.

Q: Are all listed substitutes ROHS3 compliant? A: All active alternative parts listed carry ROHS3 compliance status except the main 3RD-201 (product status not specified). The 4300F1LC, though ROHS3 compliant, is marked Not For New Designs.

Q: Does the height difference between 5.10mm and 6.35mm affect compatibility? A: Both dimensions fall within standard T-1 package specifications for through-hole mounting. The height difference results from manufacturing variations and does not prevent interchangeability in standard circuit board layouts. Height should be verified during PCB design if space constraints exist.

Q: What viewing angle should I select? A: The 3RD-201 specifies 35° viewing angle. Substitutes with 50° or 60° viewing angles provide wider light distribution, beneficial for indicator visibility from multiple angles. For designs requiring narrower light concentration, the 35° specification should be maintained.

Q: Why would I choose a lower brightness rated part like HLMP-1700 (2.1mcd) over the higher brightness 151031SS06000 (35mcd)? A: Lower brightness ratings reduce power consumption and component heat generation. Selection depends on the required indication brightness for the specific application. The 3RD-201 specifies 2mcd; brightness selection should match design requirements rather than maximizing available output.

Q: Which substitute is best for inventory planning? A: The 3RD-F maintains the original 3RD-201 specifications with active product status and established inventory. For alternative voltage requirements, HLMP-1700 and HLMP-1700-B0002 show the highest inventory levels (530,300 and 21,034 units respectively) with ROHS3 compliance and active status.

Q: Are right-angle mounting variants compatible with through-hole designs? A: HLMP-1600-D00A1 and HLMP-1600-D00A2 are specified as right-angle mounting configurations designed for board-level indicators. These differ from the radial through-hole configuration of the 3RD-201 and require modified PCB footprints. They are not direct mechanical substitutes for radial mounting applications.

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