LED RED DIFFUSED T-1 T/H 3RD-F Equivalent & Substitute Parts

Part Overview

The Bivar Inc. 3RD-F is a red diffused LED indicator in T-1 through-hole package configuration. This discrete 2.1V radial LED provides red light indication with a 2mcd brightness rating and 35° viewing angle. The component is classified as Active product status and maintains full RoHS3 compliance with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are necessary when the original 3RD-F becomes unavailable, when alternative electrical characteristics better match circuit requirements, or when different brightness levels or viewing angles are required for specific application needs.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	3RD-F	—
Manufacturer	Bivar Inc.	—
Color	Red	—
Lens Transparency	Diffused	—
Lens Size	3mm, T-1	—
Voltage - Forward (Vf) Typical	2.1	V
Current - Test	20	mA
Millicandela Rating	2	mcd
Viewing Angle	35	°
Wavelength - Peak	700	nm
Mounting Type	Through Hole	—
Package / Case	Radial	—
Height Maximum	5.30	mm
RoHS Status	ROHS3 Compliant	—
Product Status	Active	—

Substitute Part Grouping Explanation

Substitution eligibility for the 3RD-F is determined by the following critical parameters:

Primary Compatibility Criteria:

Color: Red (all substitutes must be red)
Lens Transparency: Diffused (all substitutes must be diffused)
Mounting Type: Through Hole (all substitutes must be through-hole radial)
Package / Case: Radial (all substitutes must be radial configuration)
Lens Size: 3mm, T-1 form factor (all substitutes must maintain 3mm T-1 dimensions)

Secondary Selection Parameters:

Voltage - Forward (Vf) Typical: Range 1.7V to 5V acceptable
Current - Test: Range 1mA to 20mA acceptable
Millicandela Rating: Range 1.8mcd to 45mcd acceptable
Viewing Angle: Range 35° to 60° acceptable
Wavelength - Peak: Range 635nm to 700nm acceptable
Height Maximum: Range 5.20mm to 6.35mm acceptable

All substitute parts listed maintain RoHS3 compliance and MSL 1 rating. Substitutes are grouped by electrical characteristics and brightness levels to facilitate circuit-specific selection.

Parameter Comparison

Part Number	Manufacturer	Vf (V)	Test Current (mA)	Brightness (mcd)	Viewing Angle (°)	Peak Wavelength (nm)	Height Max (mm)	Product Status	Packaging
3RD-F	Bivar Inc.	2.1	20	2	35	700	5.30	Active	Bulk
151031SS06000	Würth Elektronik	2.2	20	35	60	650	5.55	Active	Bulk
4300F1LC	Visual Communications Company - VCC	1.8	2	1.8	50	635	6.35	Not For New Designs	Bulk
HLMP-1600	Broadcom Limited	5	10	2.1	60	635	6.35	Active	Bulk
HLMP-1601	Broadcom Limited	12	13	2.1	60	635	6.35	Active	Bulk
HLMP-1700	Broadcom Limited	1.7	2	2.1	50	635	6.35	Active	Bulk
HLMP-1700-B0002	Broadcom Limited	1.7	2	2.1	50	635	6.35	Active	Cut Tape (CT)
HLMP-K101	Broadcom Limited	1.8	20	45	60	645	6.35	Active	Bulk
HLMP-K150	Broadcom Limited	1.7	1	2	60	660	6.35	Active	Bulk
HLMP-K150-C0002	Broadcom Limited	1.7	1	2	60	660	6.35	Active	Cut Tape (CT)
LTL-1CHE	Lite-On Inc.	2	20	12.6	60	635	5.20	Active	Bulk

Engineering Selection Recommendations

Direct Electrical Match (2.1V Forward Voltage Class):

The 151031SS06000 from Würth Elektronik provides the closest electrical match with 2.2V forward voltage at 20mA test current. This part maintains Active product status and offers higher brightness (35mcd) with wider viewing angle (60°). Height is marginally increased to 5.55mm. This substitute is suitable for applications requiring equivalent or enhanced brightness performance.

Low-Voltage Alternatives (1.7V to 1.8V Forward Voltage Class):

The HLMP-1700 and HLMP-1700-B0002 from Broadcom Limited operate at 1.7V with 2mA test current, providing power efficiency benefits. Both maintain 2.1mcd brightness and 50° viewing angle. The HLMP-1700-B0002 is available in Cut Tape packaging for automated assembly. These parts are suitable for battery-powered or low-power circuit applications.

The HLMP-K150 and HLMP-K150-C0002 operate at 1.7V with minimal 1mA test current, offering maximum power efficiency. These parts maintain 2mcd brightness with 60° viewing angle. The Cut Tape variant (HLMP-K150-C0002) supports automated placement. Selection is appropriate for ultra-low-power indicator applications.

High-Brightness Alternative:

The HLMP-K101 from Broadcom Limited delivers 45mcd brightness at 1.8V forward voltage with 20mA test current. This part provides significantly enhanced visibility with 60° viewing angle. Selection is appropriate for applications requiring high-visibility indication.

High-Voltage Alternatives:

The HLMP-1600 (5V) and HLMP-1601 (12V) from Broadcom Limited are designed for direct connection to standard logic and industrial voltage supplies without series resistor optimization. Both maintain 2.1mcd brightness and 60° viewing angle. These parts are suitable for applications with fixed high-voltage supplies.

Not Recommended for New Designs:

The 4300F1LC from Visual Communications Company - VCC carries "Not For New Designs" product status. This part should not be selected for new circuit development.

Frequently Asked Questions (FAQ)

Q: Can the 3RD-F be replaced with any red diffused LED?

A: No. Substitutes must maintain specific compatibility criteria: red color, diffused lens, through-hole radial mounting, and 3mm T-1 form factor. Forward voltage, brightness, and viewing angle may vary within acceptable ranges depending on circuit requirements.

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

A: Both parts are electrically identical with 1.7V forward voltage, 2mA test current, and 2.1mcd brightness. The primary difference is packaging: HLMP-1700 is supplied in Bulk, while HLMP-1700-B0002 is supplied in Cut Tape (CT) format for automated assembly equipment.

Q: Why does the 151031SS06000 have higher brightness (35mcd) than the 3RD-F (2mcd)?

A: The 151031SS06000 is designed for higher-visibility applications. The increased brightness results from different LED die characteristics and optical design. Selection depends on whether the application requires standard or enhanced visibility.

Q: Can I use HLMP-1600 or HLMP-1601 as direct replacements?

A: These parts are mechanically compatible but require circuit redesign. The HLMP-1600 operates at 5V and HLMP-1601 at 12V, compared to the 3RD-F at 2.1V. Series resistor values must be recalculated for the new forward voltage. These parts are suitable only when the circuit supply voltage matches their specifications.

Q: What does "Not For New Designs" mean for the 4300F1LC?

A: This designation indicates the part is in mature/legacy status and should not be selected for new product development. Existing designs using this part may continue, but new applications should select from Active status alternatives.

Q: How do I choose between low-voltage options (1.7V) and the original 2.1V specification?

A: Low-voltage options (HLMP-1700, HLMP-K150) reduce power consumption and heat generation, beneficial for battery-powered or thermally constrained applications. The original 2.1V specification and 151031SS06000 (2.2V) are appropriate for standard indicator applications where power efficiency is not critical.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance profile of the 3RD-F.

Q: What viewing angle should I select?

A: The 3RD-F has 35° viewing angle. Substitutes with 50° to 60° viewing angles provide wider visibility. Select based on application requirements: narrow angle (35°) for focused indication, wider angle (60°) for omnidirectional visibility.

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