3SRD-F Red LED Diffused T-1 Through-Hole Equivalent & Substitute Parts

Part Overview

The Bivar Inc. 3SRD-F is an Active status red LED indication component with diffused lens optics, designed for through-hole mounting in discrete electronic applications. This T-1 form factor LED operates at 1.7V forward voltage with a 20mA test current and delivers 40mcd brightness output. Alternative equivalent parts are necessary to address component availability, supply chain constraints, packaging preferences, or specific voltage and current requirements for circuit integration.

Key Parameters

Parameter	3SRD-F Value
Manufacturer	Bivar Inc.
Color	Red
Lens Transparency	Diffused
Lens Size	3mm, T-1
Lens Style	Round with Domed Top
Voltage - Forward (Vf)	1.7V
Current - Test	20mA
Millicandela Rating	40mcd
Viewing Angle	35°
Wavelength - Peak	645nm
Mounting Type	Through Hole
Package / Case	Radial
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 3SRD-F are determined by the following critical parameters that establish electrical and mechanical compatibility:

Mandatory compatibility criteria:

Color: Red
Lens Transparency: Diffused
Lens Style: Round with Domed Top
Mounting Type: Through Hole
Package Type: Radial (3mm T-1 form factor)
RoHS Status: ROHS3 Compliant

Performance parameters affecting substitution feasibility:

Forward Voltage (Vf): Primary design constraint for circuit integration
Current - Test: Determines brightness output and power dissipation
Millicandela Rating (mcd): Defines light intensity capability
Viewing Angle: Affects application suitability
Peak Wavelength: Determines color perception (red spectrum)

Substitute parts are grouped based on forward voltage compatibility: 1.7V-1.8V category (direct substitutes for the 3SRD-F design), 2V-2.2V category (applications tolerating higher forward voltage), and 5V-12V category (designs with higher supply voltages). Parts designated "Not For New Designs" are included for reference only in legacy application scenarios.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Current - Test	mcd	Viewing Angle	Peak Wavelength	Height (Max)	Product Status	Packaging
3SRD-F	Bivar Inc.	1.7V	20mA	40mcd	35°	645nm	5.30mm	Active	Bulk
151031SS06000	Würth Elektronik	2.2V	20mA	35mcd	60°	650nm	5.55mm	Active	Bulk
4300F1LC	Visual Communications Company - VCC	1.8V	2mA	1.8mcd	50°	635nm	6.35mm	Not For New Designs	Bulk
HLMP-1600	Broadcom Limited	5V	10mA	2.1mcd	60°	635nm	6.35mm	Active	Bulk
HLMP-1601	Broadcom Limited	12V	13mA	2.1mcd	60°	635nm	6.35mm	Active	Bulk
HLMP-1700	Broadcom Limited	1.7V	2mA	2.1mcd	50°	635nm	6.35mm	Active	Bulk
HLMP-1700-B0002	Broadcom Limited	1.7V	2mA	2.1mcd	50°	635nm	6.35mm	Active	Cut Tape (CT)
HLMP-K101	Broadcom Limited	1.8V	20mA	45mcd	60°	645nm	6.35mm	Active	Bulk
HLMP-K150	Broadcom Limited	1.7V	1mA	2mcd	60°	660nm	6.35mm	Active	Bulk
HLMP-K150-C0002	Broadcom Limited	1.7V	1mA	2mcd	60°	660nm	6.35mm	Active	Cut Tape (CT)
LTL-1CHE	Lite-On Inc.	2V	20mA	12.6mcd	60°	635nm	5.20mm	Active	Bulk

Engineering Selection Recommendations

Direct electrical equivalents (1.7V forward voltage category): HLMP-1700, HLMP-1700-B0002, and HLMP-K150, HLMP-K150-C0002 are Active status parts from Broadcom Limited with identical 1.7V forward voltage to the 3SRD-F, enabling direct circuit substitution without voltage bias modification. HLMP-1700-B0002 and HLMP-K150-C0002 are supplied in Cut Tape packaging for automated assembly applications; equivalent Bulk packaged versions are available as HLMP-1700 and HLMP-K150 respectively.

Compatible high-brightness substitute (1.8V forward voltage category): HLMP-K101 operates at 1.8V forward voltage with matching 20mA test current and delivers 45mcd output, marginally exceeding the 40mcd specification of the 3SRD-F. This part is Active status and suitable for applications where voltage tolerance and enhanced brightness output are acceptable.

Alternative voltage category substitutes: 151031SS06000 from Würth Elektronik and LTL-1CHE from Lite-On Inc. operate at 2V-2.2V forward voltage with 20mA test current and are Active status. These require circuit redesign to accommodate higher forward voltage drop. The 4300F1LC part carries "Not For New Designs" status and operates at significantly lower current and brightness levels; inclusion is restricted to legacy system maintenance only.

High-voltage substitutes (5V and 12V categories): HLMP-1600 and HLMP-1601 are Active status parts suitable exclusively for 5V and 12V supply applications respectively, requiring dedicated circuit topology and current-limiting resistor recalculation.

All listed substitutes maintain ROHS3 compliance and MSL-1 (Unlimited) moisture sensitivity rating, matching the environmental qualifications of the 3SRD-F.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1700 be used as a direct replacement for 3SRD-F in existing circuit designs? A: Yes. HLMP-1700 operates at identical 1.7V forward voltage and is electrically compatible without circuit modification. Note the significantly reduced brightness output (2.1mcd versus 40mcd); verify application luminosity requirements before substitution.

Q: What is the difference between HLMP-K150 and HLMP-K150-C0002? A: Both parts are electrically identical with 1.7V Vf and 1mA test current. HLMP-K150 is supplied in Bulk packaging; HLMP-K150-C0002 is supplied in Cut Tape (CT) form for automated pick-and-place assembly. Packaging selection depends on manufacturing process requirements.

Q: Why is 4300F1LC marked "Not For New Designs"? A: Visual Communications Company has discontinued this part for new applications. It is retained in the substitute list for legacy system support only. New designs should specify HLMP-1700, HLMP-K150, or HLMP-K101 from the Active status category.

Q: Are 151031SS06000 and 3SRD-F interchangeable without circuit modification? A: No. 151031SS06000 operates at 2.2V forward voltage compared to 3SRD-F at 1.7V. This 0.5V difference alters circuit behavior and requires recalculation of series current-limiting resistances. Mechanical compatibility is maintained (3mm diffused round lens, through-hole radial package).

Q: Can HLMP-1600 replace 3SRD-F? A: Only in applications redesigned for 5V supply voltage. HLMP-1600 operates at 5V forward voltage and 10mA test current. Direct substitution in 1.7V circuits will result in failure. A complete circuit topology revision is required.

Q: Which substitute offers the highest brightness comparable to 3SRD-F? A: HLMP-K101 delivers 45mcd at 1.8V forward voltage and 20mA test current, slightly exceeding the 40mcd output of 3SRD-F. This represents the closest performance match among Active status alternatives and requires minimal circuit adjustment (0.1V voltage tolerance).

Q: What packaging options are available for equivalent parts? A: Broadcom Limited HLMP series parts are available in both Bulk and Cut Tape (CT) packaging. Würth Elektronik and Lite-On parts are supplied in Bulk. Cut Tape versions are recommended for surface-mount compatible production lines using tape-and-reel feeding systems.

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