Equivalent & Substitute Parts for 3SRC-201 Red LED T-1 Through Hole

Part Overview

The 3SRC-201 is a red LED indication component manufactured by Bivar Inc., featuring a 3mm T-1 through-hole package with a clear domed lens. This discrete 1.7V radial LED delivers 60 millicandela at 20mA test current with a 645nm peak wavelength and 20° viewing angle. The component is classified as obsolete, necessitating identification of active substitute parts that maintain functional equivalence for red LED indication applications. Substitute parts must preserve the core electrical characteristics, mechanical form factor, and mounting compatibility while offering active product status and current availability.

Key Parameters

Parameter	3SRC-201 Value	Substitution Relevance
Color	Red	Critical - Must match
Lens Transparency	Clear	Critical - Affects light transmission
Lens Size / Package	3mm T-1	Critical - Mechanical compatibility
Mounting Type	Through Hole Radial	Critical - PCB footprint compatibility
Voltage - Forward (Vf) Typical	1.7V	Important - Circuit design parameter
Current - Test	20mA	Important - Operating point reference
Millicandela Rating	60mcd	Important - Brightness specification
Wavelength - Peak	645nm	Important - Color specification
Viewing Angle	20°	Important - Directional characteristics
Height (Max)	5.10mm	Important - PCB clearance
Product Status	Obsolete	Critical - Drives substitution need

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on parametric alignment with the 3SRC-201:

Parametric Equivalent (Direct Replacement): The 3SRC-F from Bivar Inc. maintains identical electrical specifications (1.7V Vf, 60mcd, 645nm peak wavelength, 20° viewing angle) and mechanical form factor (3mm T-1 clear lens, through-hole radial). The primary difference is active product status and marginally increased height (5.30mm vs. 5.10mm). This part provides the closest functional match for direct substitution.

Similar Substitutes (Compatible Alternatives): Remaining parts share the core substitution criteria: red color, 3mm T-1 through-hole package, clear lens, and radial configuration. However, they exhibit variations in one or more secondary parameters including forward voltage (1.8V to 2.05V), millicandela rating (3mcd to 680mcd), viewing angle (40° to 56°), and peak wavelength (627nm to 640nm). These parts are suitable for applications where the specific parameter variation does not conflict with circuit design constraints.

Key Substitution Parameters:

Color: Red (all substitutes)
Lens Type: Clear (all substitutes)
Package: 3mm T-1 through-hole radial (all substitutes)
Mounting: Through hole (all substitutes)
Forward Voltage Range: 1.7V to 2.05V (acceptable tolerance for most LED indication circuits)
Millicandela Range: 3mcd to 680mcd (application-dependent selection)
Viewing Angle Range: 20° to 56° (application-dependent selection)

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	mcd	Peak λ (nm)	Viewing Angle	Height Max (mm)	Product Status	Packaging
3SRC-201	Bivar Inc.	1.7V	60	645	20°	5.10	Obsolete	-
3SRC-F	Bivar Inc.	1.7V	60	645	20°	5.30	Active	Bulk
HLMP-K155	Broadcom Limited	1.7V	3	660	45°	6.35	Active	Bulk
HLMP-K105	Broadcom Limited	1.8V	65	645	45°	6.35	Active	Bulk
HLMP-K105-J0002	Broadcom Limited	1.8V	65	645	45°	6.35	Active	Cut Tape (CT)
HLMP-Y601-J0000	Broadcom Limited	2.0V	680	633	45°	5.20	Active	Bulk
HLMP-Y651-G0000	Broadcom Limited	2.0V	300	652	45°	5.20	Active	Bulk
151031SS04000	Würth Elektronik	2.0V	160	640	40°	5.55	Active	Bulk
LTL1CHKEKNN	Lite-On Inc.	2.05V	680	632	45°	5.20	Active	Bulk
LTL1CHKRKNN	Lite-On Inc.	2.0V	400	639	45°	5.20	Active	Bulk
LTL42NKRKNN	Lite-On Inc.	2.0V	180	639	56°	5.85	Active	Bulk

Engineering Selection Recommendations

Primary Recommendation: 3SRC-F The 3SRC-F from Bivar Inc. is the optimal substitute, providing parametric equivalence to the 3SRC-201 with identical electrical specifications and mechanical form factor. This part maintains 1.7V forward voltage, 60mcd brightness, and 645nm peak wavelength. The component is active, RoHS3 compliant, and available in bulk packaging with 906 units in stock. Height variance (5.30mm vs. 5.10mm) is within acceptable tolerance for standard through-hole PCB applications.

Secondary Recommendations by Application:

For applications requiring higher brightness with acceptable forward voltage increase: HLMP-Y601-J0000 (680mcd, 2.0V) or LTL1CHKEKNN (680mcd, 2.05V) provide significantly enhanced luminous intensity while maintaining 3mm T-1 form factor and clear lens characteristics. Both are active, RoHS3 compliant, and widely available.

For applications with tight PCB height constraints: HLMP-Y601-J0000 and HLMP-Y651-G0000 offer reduced maximum height (5.20mm) compared to the original 5.10mm specification, with HLMP-Y651-G0000 providing moderate brightness (300mcd) at 2.0V forward voltage.

For applications requiring wide viewing angle: LTL42NKRKNN provides 56° viewing angle with 180mcd brightness and 2.0V forward voltage, suitable for omnidirectional indication requirements.

For cost-optimized solutions with lower brightness requirements: HLMP-K155 operates at 1.7V forward voltage (matching original) but delivers only 3mcd, appropriate for low-intensity indicator applications with reduced power consumption.

All recommended substitutes are active products with RoHS3 compliance and MSL 1 (unlimited moisture sensitivity) rating, ensuring long-term availability and environmental compliance.

Frequently Asked Questions (FAQ)

Q: Can the 3SRC-F directly replace the 3SRC-201 without circuit modification?

A: Yes. The 3SRC-F maintains identical forward voltage (1.7V), test current (20mA), and brightness (60mcd) specifications. The 0.20mm height increase (5.30mm vs. 5.10mm) does not affect standard through-hole PCB applications. No circuit redesign is required.

Q: What is the primary difference between the 3SRC-201 and its substitutes?

A: The 3SRC-201 is obsolete; all listed substitutes are active products. Electrical and mechanical parameters vary among substitutes. The 3SRC-F provides the closest match; other parts offer trade-offs in brightness, forward voltage, or viewing angle.

Q: Can I use HLMP-Y601-J0000 instead of 3SRC-201 if my circuit can tolerate 2.0V forward voltage?

A: Yes, if circuit design permits 0.3V forward voltage increase and 680mcd brightness (vs. 60mcd original). The part maintains 3mm T-1 clear lens through-hole configuration. Verify that the increased brightness does not cause optical interference in the application.

Q: What is the difference between HLMP-K105 and HLMP-K105-J0002?

A: Both parts are electrically and mechanically identical (1.8V Vf, 65mcd, 645nm wavelength, 45° viewing angle, 6.35mm height). The difference is packaging: HLMP-K105 is supplied in bulk; HLMP-K105-J0002 is supplied in cut tape (CT). Select based on assembly process requirements. HLMP-K105-J0002 offers higher inventory (20,739 units).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitutes carry RoHS3 compliance certification. The 3SRC-201 status is not specified; verify compliance requirements for your application before final selection.

Q: How do I choose between high-brightness substitutes like HLMP-Y601-J0000 (680mcd) and the original 60mcd specification?

A: Brightness selection depends on application requirements. Higher brightness (680mcd) is suitable for high-ambient-light environments or applications requiring long viewing distance. Lower brightness reduces power consumption and heat generation. Verify that increased brightness does not cause optical glare or interference with adjacent components.

Q: What is the viewing angle significance, and how does it affect substitution?

A: Viewing angle determines the cone of light emission. The 3SRC-201 specifies 20° (narrow, directional); most substitutes offer 45° to 56° (wider, omnidirectional). Narrow viewing angle is suitable for focused indication; wide viewing angle is suitable for general visibility. Select based on PCB layout and visibility requirements.

Q: Can I use the Würth Elektronik 151031SS04000 as a substitute?

A: Yes, with parameter awareness. This part features diffused red lens (vs. clear), 160mcd brightness, 2.0V forward voltage, and 40° viewing angle. The diffused lens provides softer light distribution suitable for applications where harsh brightness is undesirable. Verify that diffused lens appearance meets aesthetic requirements.

Q: What does "Bulk" vs. "Cut Tape (CT)" packaging mean for substitution?

A: Bulk packaging is loose components suitable for manual assembly or tube feeding. Cut tape is pre-cut from reel tape, suitable for pick-and-place automated assembly. Both provide identical electrical and mechanical specifications. Select based on assembly process capability.

Q: Are there any compliance or certification differences among the substitutes?

A: All substitutes carry RoHS3 compliance. REACH status varies: Broadcom and Würth Elektronik parts show "REACH Unaffected"; Lite-On LTL1CHKRKNN shows "REACH Affected." For applications in REACH-regulated regions, verify compliance requirements. All parts carry MSL 1 (unlimited moisture sensitivity) and EAR99 export classification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message