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

Part Overview

The Bivar Inc. 3HD is a red diffused LED indicator designed for discrete signal indication applications. This through-hole mounted component features a 3mm T-1 lens form factor with a 2V forward voltage rating and 30mcd brightness output. The part is currently classified as obsolete, necessitating identification of suitable substitute components that maintain functional compatibility while offering improved availability and, in many cases, enhanced performance characteristics. Substitute selection must be based on matching electrical specifications, physical dimensions, lens properties, and mounting configuration to ensure seamless integration into existing circuit designs.

Key Parameters

Parameter	Value
Manufacturer	Bivar Inc.
Part Number	3HD
Color	Red
Lens Size	3mm, T-1
Lens Transparency	Diffused
Lens Style	Round with Domed Top
Voltage - Forward (Vf) (Typ)	2V
Current - Test	20mA
Millicandela Rating	30mcd
Viewing Angle	40°
Wavelength - Peak	625nm
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	4.50mm
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the Bivar Inc. 3HD are grouped based on the following critical electrical and mechanical compatibility parameters:

Electrical Parameters: Forward voltage (Vf), test current, millicandela rating, and wavelength characteristics determine functional compatibility. Substitutes with differing forward voltages require circuit re-evaluation but remain viable alternatives if the test current and voltage operating range align with system design constraints.

Physical Parameters: Lens size (3mm T-1), lens transparency (diffused), mounting type (through-hole radial), and maximum height establish mechanical compatibility. All qualifying substitutes maintain the 3mm T-1 form factor and radial configuration.

Optical Parameters: Red color, diffused lens transparency, and round domed top lens style establish visual compatibility. Peak wavelengths in the 625–650nm range confirm red spectrum alignment.

Key Parameters for Substitution Assessment:

Forward Voltage (Vf): 1.7V to 2.2V acceptable
Test Current: 2mA to 20mA range
Lens Size: 3mm T-1 (mandatory)
Mounting Type: Through Hole Radial (mandatory)
Lens Transparency: Diffused (mandatory)
Height (Max): 4.50mm to 6.35mm acceptable

Parameter Comparison

Parameter	Bivar 3HD	Everlight 1254-10SURD/S530-A3	Würth 151031SS06000	VCC 4300F1LC	Broadcom HLMP-1301-G00FG	Broadcom HLMP-1700	Broadcom HLMP-1700-B0002
Manufacturer	Bivar Inc.	Everlight Electronics	Würth Elektronik	Visual Communications Company	Broadcom Limited	Broadcom Limited	Broadcom Limited
Part Number	3HD	1254-10SURD/S530-A3	151031SS06000	4300F1LC	HLMP-1301-G00FG	HLMP-1700	HLMP-1700-B0002
Color	Red	Red	Red	Red	Red	Red	Red
Lens Size	3mm, T-1	3.00mm	3.00mm	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1
Lens Transparency	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused
Lens Style	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top
Voltage - Forward (Vf) (Typ)	2V	2V	2.2V	1.8V	1.9V	1.7V	1.7V
Current - Test	20mA	20mA	20mA	2mA	10mA	2mA	2mA
Millicandela Rating	30mcd	400mcd	35mcd	1.8mcd	8.6mcd	2.1mcd	2.1mcd
Viewing Angle	40°	30°	60°	50°	60°	50°	50°
Wavelength - Peak	625nm	632nm	650nm	635nm	635nm	635nm	635nm
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial	Radial
Height (Max)	4.50mm	5.30mm	5.55mm	6.35mm	6.35mm	6.35mm	6.35mm
Product Status	Obsolete	Active	Active	Not For New Designs	Active	Active	Active
RoHS Status	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

First Priority - Active Status & Compliance: Broadcom Limited HLMP-1700 and HLMP-1700-B0002 represent the preferred substitutes. Both parts maintain active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. The HLMP-1700-B0002 variant is supplied on cut tape (CT) packaging, offering flexibility for both production and manual assembly applications.

Electrical Compatibility: The Broadcom HLMP-1700 series operates at 1.7V forward voltage with 2mA test current, representing a slight reduction from the original 3HD specification (2V, 20mA). This lower operating current reduces circuit design constraints and power dissipation. The 2.1mcd brightness rating provides reduced optical intensity compared to the 3HD, suitable for indicator applications requiring lower brightness output.

Secondary Substitutes - Active Status: The Everlight Electronics 1254-10SURD/S530-A3 maintains electrical parameters identical to the original 3HD (2V, 20mA) and offers significantly enhanced brightness (400mcd), delivering optical performance exceeding the original specification. The Würth Elektronik 151031SS06000 provides compatibility with forward voltage at 2.2V and 35mcd brightness, comparable to the original component, with active product status and ROHS3 compliance.

Broadcom HLMP-1301-G00FG Consideration: This active part operates at 1.9V with 10mA test current and provides 8.6mcd brightness. It represents a balanced middle ground between reduced operating current and improved brightness characteristics relative to HLMP-1700.

Not Recommended - Obsolete/Legacy Status: Visual Communications Company 4300F1LC carries "Not For New Designs" status and should be avoided for new development projects, despite active inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the Broadcom HLMP-1700 directly replace the obsolete Bivar 3HD without circuit modification?

A: The HLMP-1700 exhibits lower forward voltage (1.7V vs. 2V) and reduced test current (2mA vs. 20mA). Direct replacement in existing circuits designed for the 3HD specifications requires circuit evaluation. The reduced current demand is generally advantageous, but brightness reduction (2.1mcd vs. 30mcd) may impact visibility in certain applications. Evaluation of series resistor values and power supply sourcing is necessary.

Q: What is the primary difference between Broadcom HLMP-1700 and HLMP-1700-B0002?

A: Both parts are electrically and optically identical. The HLMP-1700-B0002 is supplied on cut tape (CT) packaging, while the standard HLMP-1700 is supplied in bulk packaging. Selection depends on manufacturing assembly process requirements: cut tape suits automated placement equipment and small-volume manual assembly; bulk packaging is suitable for large-volume reel-fed production.

Q: Does the height difference between substitutes affect PCB design?

A: The original Bivar 3HD specifies 4.50mm maximum height. Substitute parts range from 5.30mm (Everlight) to 6.35mm (Broadcom, VCC). If PCB layout includes tight vertical clearance constraints or shielding enclosures, the increased height must be accommodated. Würth and Everlight options provide reduced height relative to Broadcom parts.

Q: Are all substitute parts RoHS3 compliant?

A: Broadcom HLMP-1700, HLMP-1700-B0002, HLMP-1301-G00FG, and Würth 151031SS06000 carry explicit ROHS3 compliance statements. Everlight 1254-10SURD/S530-A3 compliance status is not specified in provided documentation. VCC 4300F1LC carries "Not For New Designs" designation despite ROHS3 compliance.

Q: Which substitute offers optical performance closest to the original 3HD?

A: The Würth Elektronik 151031SS06000 provides the closest brightness match (35mcd vs. 30mcd original specification). The Everlight 1254-10SURD/S530-A3 delivers significantly higher brightness (400mcd), suitable for applications requiring enhanced visibility.

Q: How do wavelength variations affect color consistency?

A: All substitutes maintain red spectrum output (625–650nm peak wavelength range). The original 3HD specifies 625nm peak wavelength, while substitutes range to 650nm. Within diffused red LED applications, this variation is visually imperceptible and does not affect functional color discrimination in indicator circuits.

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