Bivar Inc. 3RD LED RED DIFFUSED T-1 T/H

Part Overview

The Bivar Inc. 3RD is a red LED indicator with diffused lens in T-1 (3mm) through-hole package, rated at 2.1V forward voltage and 20mA test current. This part is classified as Obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary to maintain system compatibility and ensure long-term component availability for new designs and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Bivar Inc.
Part Number	3RD
Product Status	Obsolete
Color	Red
Lens Transparency	Diffused
Lens Size	3mm, T-1
Voltage - Forward (Vf) Typical	2.1V
Current - Test	20mA
Millicandela Rating	2mcd
Viewing Angle	40°
Mounting Type	Through Hole
Wavelength - Peak	700nm
Lens Style	Round with Domed Top
Height (Max)	4.50mm
Package / Case	Radial
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the Bivar Inc. 3RD is determined by the following critical parameters:

Color and Lens Transparency: Red color with diffused lens (primary functional requirement)
Lens Size and Mounting Type: 3mm T-1 through-hole package (physical compatibility requirement)
Voltage Forward (Vf) Range: 1.7V to 2.2V (circuit compatibility window)
Current - Test: 20mA (or compatible operating range)
Viewing Angle: 40° to 60° (functional visibility requirement)
Lens Style: Round with domed top (mechanical fit requirement)
Mounting Type: Through-hole radial configuration (assembly compatibility)

Parts meeting all these criteria are classified as parametric equivalents or suitable alternatives. Parts with variations in voltage rating, millicandela output, or viewing angle are listed as similar alternatives where functional parameters deviate from the original specification.

Parameter Comparison

Part Number	Manufacturer	Product Status	Color	Lens Transparency	Lens Size	Vf (Typ)	Current - Test	mcd	Viewing Angle	Height (Max)	Packaging
3RD	Bivar Inc.	Obsolete	Red	Diffused	3mm, T-1	2.1V	20mA	2mcd	40°	4.50mm	Radial
3RD-S	Bivar Inc.	Active	Red	Diffused	3mm, T-1	2.1V	20mA	2mcd	40°	4.50mm	Bulk
1254-10SURD/S530-A3	Everlight Electronics Co Ltd	Active	Red	Diffused	3.00mm Dia	2V	20mA	400mcd	30°	5.30mm	Tape & Reel (TR)
151031SS06000	Würth Elektronik	Active	Red	Diffused	3.00mm Dia	2.2V	20mA	35mcd	60°	5.55mm	Bulk
4300F1LC	Visual Communications Company - VCC	Not For New Designs	Red	Diffused	3mm, T-1	1.8V	2mA	1.8mcd	50°	6.35mm	Bulk
HLMP-1301-G00FG	Broadcom Limited	Active	Red	Diffused	3mm, T-1	1.9V	10mA	8.6mcd	60°	6.35mm	Bulk
HLMP-1600	Broadcom Limited	Active	Red	Diffused	3mm, T-1	5V	10mA	2.1mcd	60°	6.35mm	Bulk
HLMP-1601	Broadcom Limited	Active	Red	Diffused	3mm, T-1	12V	13mA	2.1mcd	60°	6.35mm	Bulk
HLMP-1700	Broadcom Limited	Active	Red	Diffused	3mm, T-1	1.7V	2mA	2.1mcd	50°	6.35mm	Bulk

Engineering Selection Recommendations

Parametric Equivalent (Preferred)

3RD-S (Bivar Inc.): Active product status with identical electrical and optical parameters to the original 3RD. Voltage, current, luminous intensity, and viewing angle specifications match exactly. Bulk packaging accommodates production requirements. This part is the direct replacement for designs currently using the obsolete 3RD.

Active Alternative (2.1V Forward Voltage Class)

HLMP-1700 (Broadcom Limited): Active product with matching 2.1mcd intensity and comparable viewing angle (50°). Forward voltage of 1.7V and test current of 2mA represent lower power operation at identical millicandela output. ROHS3 compliant with unlimited moisture sensitivity rating. Compatible with 3mm T-1 through-hole mounting.

Alternatives with Voltage Deviations (1.7V–2.2V Class)

HLMP-1301-G00FG (Broadcom Limited): Active status with 1.9V forward voltage and 10mA test current. Viewing angle expanded to 60°. Higher millicandela output (8.6mcd) at reduced test current. ROHS3 and REACH compliant. Suitable where brightness increase and wider viewing angle are acceptable.
151031SS06000 (Würth Elektronik): Active status with 2.2V forward voltage and 60° viewing angle. Millicandela rating of 35mcd provides increased brightness. ROHS3 compliant with REACH unaffected status. Height maximum of 5.55mm requires mechanical validation.

Alternatives with Different Voltage Ratings

HLMP-1600 (Broadcom Limited): Active status with 5V forward voltage. Suitable for 5V circuit applications. Millicandela output (2.1mcd) matches original specification. ROHS3 compliant.
HLMP-1601 (Broadcom Limited): Active status with 12V forward voltage. Suitable for 12V circuit applications. Millicandela output (2.1mcd) matches original specification. ROHS3 compliant.

Not Recommended for New Designs

4300F1LC (Visual Communications Company - VCC): Product status "Not For New Designs" restricts use in ongoing development. Forward voltage of 1.8V and test current of 2mA fall within acceptable range, but obsolescence trajectory and reduced test current warrant avoidance.

Frequently Asked Questions (FAQ)

Q: What is the primary reason for substituting the Bivar Inc. 3RD? A: The 3RD is classified as obsolete. The recommended substitute is the 3RD-S from Bivar Inc., which maintains active product status while retaining all electrical and optical specifications of the original part.

Q: Can the 3RD-S be used as a direct replacement? A: Yes. The 3RD-S is a parametric equivalent with identical voltage forward (2.1V), test current (20mA), millicandela rating (2mcd), viewing angle (40°), lens style, and lens size specifications. Only packaging differs (bulk vs. radial tape).

Q: What are the critical parameters for LED substitution? A: Forward voltage (Vf), test current, millicandela (brightness) output, viewing angle, lens color, lens transparency (diffused), lens size (3mm T-1), and mounting type (through-hole radial). All alternatives must maintain compatibility in these categories.

Q: Which alternatives work with the same forward voltage as the original 3RD? A: The 3RD-S (2.1V exact match) and HLMP-1700 (1.7V, lower power variant). HLMP-1700 operates at reduced current (2mA vs. 20mA) but maintains 2.1mcd brightness. Vf variance within 1.7V–2.2V range is electrically compatible for most low-voltage circuits.

Q: Can I substitute the 3RD with HLMP-1600 or HLMP-1601? A: HLMP-1600 (5V) and HLMP-1601 (12V) are suitable only for circuits designed for their respective voltage ratings. These parts are not direct substitutes for 2.1V circuits. Verify circuit design and voltage requirements before selection.

Q: What is the difference in mechanical fit between alternatives? A: The original 3RD has maximum height of 4.50mm. Most alternatives (HLMP series, 151031SS06000) have heights of 5.55mm or 6.35mm. Verify PCB clearance and mechanical constraints before installation, particularly in space-constrained applications.

Q: Are all active alternatives RoHS3 compliant? A: Yes. HLMP-1700, HLMP-1300-G00FG, HLMP-1600, HLMP-1601, 151031SS06000, and 3RD-S all carry ROHS3 compliance status, meeting current regulatory requirements for electronic components.

Q: Which alternative offers the highest brightness? A: The 1254-10SURD/S530-A3 (Everlight Electronics) provides 400mcd brightness, substantially higher than the original 2mcd specification. This part is suitable only for applications requiring significantly increased luminous intensity.

Q: What packaging formats are available? A: Bulk packaging is available from Bivar Inc., Broadcom Limited, Würth Elektronik, and VCC. Tape & Reel (TR) packaging is available from Everlight Electronics for automated assembly applications.

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