3RDL LED RED DIFFUSED T-1 T/H

Part Overview

The 3RDL is a red diffused through-hole LED manufactured by Bivar Inc., designed for discrete LED indication applications. This component features a 3mm T-1 lens form factor with a 2.1V forward voltage and 0.5mcd brightness rating at 2mA test current. The product is classified as obsolete, necessitating identification of equivalent and substitute parts to maintain circuit design compatibility and ensure component availability for existing applications and new production alternatives.

Key Parameters

Parameter	Specification
Manufacturer Part Number	3RDL
Manufacturer	Bivar Inc.
Color	Red
Lens Transparency	Diffused
Lens Size	3mm, T-1
Lens Style	Round with Domed Top
Voltage - Forward (Vf) (Typ)	2.1V
Current - Test	2mA
Millicandela Rating	0.5mcd
Viewing Angle	40°
Mounting Type	Through Hole
Wavelength - Peak	700nm
Package / Case	Radial
Height (Max)	4.50mm
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 3RDL are selected based on the following critical parameters that determine compatibility:

Primary Compatibility Criteria:

Color: Red
Lens Transparency: Diffused
Lens Size: 3mm, T-1
Lens Style: Round with Domed Top
Mounting Type: Through Hole
Package / Case: Radial

Secondary Selection Parameters:

Forward Voltage (Vf): 1.8V to 5V range acceptable for circuit redesign
Current Rating: 2mA to 20mA test current
Brightness (mcd): 0.5mcd to 400mcd range
Viewing Angle: 30° to 60°
Wavelength - Peak: 630nm to 700nm red spectrum
Height: Up to 6.35mm maximum

The 3RDL operates at 2.1V with 2mA test current and 0.5mcd brightness. Substitute parts maintain the same mechanical form factor (3mm T-1 through-hole radial package) and red diffused lens characteristics. Active and available substitute parts offer improved specifications or enhanced availability compared to the obsolete original.

Parameter Comparison

Part Number	Manufacturer	Color	Lens Transparency	Lens Size	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Peak Wavelength	Height (Max)	Status
3RDL	Bivar Inc.	Red	Diffused	3mm, T-1	2.1V	2mA	0.5mcd	40°	700nm	4.50mm	Obsolete
1254-10SURD/S530-A3	Everlight Electronics Co Ltd	Red	Diffused	3.00mm Dia	2V	20mA	400mcd	30°	632nm	5.30mm	Active
151031SS06000	Würth Elektronik	Red	Diffused	3.00mm Dia	2.2V	20mA	35mcd	60°	650nm	5.55mm	Active
4300F1LC	Visual Communications Company - VCC	Red	Diffused	3mm, T-1	1.8V	2mA	1.8mcd	50°	635nm	6.35mm	Not For New Designs
HLMP-1301-G00FG	Broadcom Limited	Red	Diffused	3mm, T-1	1.9V	10mA	8.6mcd	60°	635nm	6.35mm	Active
HLMP-1600	Broadcom Limited	Red	Diffused	3mm, T-1	5V	10mA	2.1mcd	60°	635nm	6.35mm	Active
HLMP-1600-D00A1	Broadcom Limited	Red	Diffused, Tinted	3mm, T-1	5V	10mA	2.1mcd	60°	635nm	Not Specified	Active
HLMP-1600-D00A2	Broadcom Limited	Red	Diffused, Tinted	3mm, T-1	5V	10mA	2.1mcd	60°	635nm	Not Specified	Active
HLMP-1601	Broadcom Limited	Red	Diffused	3mm, T-1	12V	13mA	2.1mcd	60°	635nm	6.35mm	Active
HLMP-1700	Broadcom Limited	Red	Diffused	3mm, T-1	1.7V	2mA	2.1mcd	50°	635nm	6.35mm	Active
HLMP-1700-B0002	Broadcom Limited	Red	Diffused	3mm, T-1	1.7V	2mA	2.1mcd	50°	635nm	6.35mm	Active

Engineering Selection Recommendations

Recommended Primary Substitutes for Active Production:

HLMP-1700 and HLMP-1700-B0002 (Broadcom Limited) - These parts are the closest electrical and mechanical equivalents to the 3RDL. Both maintain the same 1.7V forward voltage and 2mA test current profile, with identical 3mm T-1 mechanical form factor, round domed lens, and radial through-hole mounting. The HLMP-1700 series offers 2.1mcd brightness with 50° viewing angle and 635nm peak wavelength. ROHS3 compliance and unlimited MSL rating provide long-term design stability. High inventory availability (530,300 pcs for bulk HLMP-1700) ensures supply continuity.

HLMP-1301-G00FG (Broadcom Limited) - This part accommodates applications requiring slightly higher brightness (8.6mcd) while maintaining the T-1 form factor. Forward voltage is 1.9V with 10mA test current. ROHS3 compliant and actively produced with 1,067 pcs inventory. Suitable for designs where marginally increased luminosity is acceptable.

Alternative Substitutes Based on Circuit Requirements:

151031SS06000 (Würth Elektronik) - Recommended when circuit redesign for 20mA operation is feasible. This part delivers significantly higher brightness (35mcd) at 2.2V forward voltage with 3mm mechanical dimensions. Series designation WL-TMRC provides extended supply availability (10,009 pcs). ROHS3 compliant with unlimited MSL. 60° viewing angle provides wider visibility than the original 40°.

HLMP-1600 and HLMP-1601 (Broadcom Limited) - These Broadcom parts operate at higher supply voltages (5V and 12V respectively) and are applicable only when circuit voltage levels permit redesign. Both maintain 3mm T-1 form factor with improved availability and active status.

Parts Not Recommended for New Designs:

4300F1LC (Visual Communications Company - VCC) - Marked "Not For New Designs" by manufacturer. While mechanically compatible, this status precludes use in new development.

1254-10SURD/S530-A3 (Everlight Electronics Co Ltd) - Though active, requires 20mA test current and offers different brightness characteristics (400mcd). Height reaches 5.30mm, potentially exceeding design constraints of the original 4.50mm component.

Frequently Asked Questions (FAQ)

Q: Can the 3RDL be directly replaced by HLMP-1700 without circuit modification? A: Yes. The HLMP-1700 and HLMP-1700-B0002 are electrically and mechanically compatible direct substitutes. Both operate at 1.7V forward voltage with 2mA test current, identical mechanical form factor (3mm T-1 through-hole radial), and equivalent optical characteristics (2.1mcd, 50° viewing angle, red diffused lens).

Q: What is the key difference between HLMP-1700 and HLMP-1700-B0002? A: Both parts are electrically identical. The primary difference is packaging: HLMP-1700 is supplied in bulk, while HLMP-1700-B0002 is provided in cut tape (CT) form. Select based on production assembly requirements.

Q: Why does the 3RDL specify "Obsolete" status? A: The 3RDL has been discontinued by Bivar Inc. Equivalent active alternatives from major manufacturers (Broadcom, Würth Elektronik, Everlight) provide improved specification consistency, higher inventory availability, and long-term supply security.

Q: Can higher brightness LEDs like 1254-10SURD/S530-A3 (400mcd) be used as substitutes? A: Higher brightness LEDs are physically compatible but require circuit redesign. The 1254-10SURD/S530-A3 operates at 20mA test current versus the 3RDL's 2mA, necessitating current-limiting resistor modifications. Use this substitute only when brightness enhancement aligns with application requirements.

Q: What does the ROHS3 compliance designation indicate? A: ROHS3 Compliant status confirms the component meets Restriction of Hazardous Substances regulations, excluding lead and other restricted materials. This certification is provided for HLMP-1700, HLMP-1301-G00FG, HLMP-1600, HLMP-1601, 151031SS06000, and 4300F1LC. All recommended primary substitutes carry this compliance.

Q: Are there height constraints when selecting a substitute? A: The original 3RDL specifies 4.50mm maximum height. Substitute parts reach 5.30mm to 6.35mm maximum height. In space-constrained PCB designs, verify clearance before selecting alternatives. The mechanical form factor (3mm T-1) is maintained across all substitutes.

Q: What viewing angle differences exist among substitutes? A: The 3RDL provides 40° viewing angle. Active substitutes offer 30° to 60° ranges. Narrower angles (HLMP-1600 series at 60°) provide wider light distribution, while 30° variants concentrate light more directionally. Select based on application visibility requirements.

Q: Which substitute offers the longest supply availability? A: HLMP-1700 in bulk packaging provides 530,300 pcs inventory. For tape/reel packaging, HLMP-1700-B0002 offers 21,034 pcs, and 151031SS06000 provides 10,009 pcs. These quantities ensure multi-year supply continuity for production planning.

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