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

Part Overview

The 3SRC-F is a red LED indication component manufactured by Bivar Inc., designed for through-hole mounting applications. This T-1 form factor LED operates at 1.7V forward voltage with a 60mcd brightness rating and features a clear, domed lens. The component is ROHS3 compliant and maintains active product status.

Substitute parts are identified to provide alternative sourcing options when the primary component becomes unavailable, while maintaining compatibility with the specified electrical and mechanical parameters of the application circuit.

Key Parameters

Parameter	3SRC-F Value	Significance for Substitution
Mounting Type	Through Hole	Determines PCB compatibility and mechanical fit
Lens Size	3mm, T-1	Physical form factor and optical housing
Voltage - Forward (Vf) (Typ)	1.7V	Circuit bias and current limiting resistor calculation
Current - Test	20mA	Operating current specification
Color	Red	Optical output specification
Lens Transparency	Clear	Optical transmission characteristic
Package / Case	Radial	Lead configuration and PCB hole spacing
RoHS Status	ROHS3 Compliant	Regulatory compliance requirement

Substitute Part Grouping Explanation

Substitute parts are grouped based on strict compatibility with the following critical parameters:

Primary Compatibility Criteria:

Mounting Type: Through Hole (all substitutes must match)
Lens Size: 3mm T-1 form factor (all substitutes must match)
Color: Red (all substitutes must match)
Package / Case: Radial (all substitutes must match)
RoHS Status: ROHS3 Compliant (all substitutes must match)

Secondary Electrical Parameters (allowable variance):

Voltage - Forward (Vf): Range 1.7V to 2.05V (circuit design dependent)
Current - Test: 10mA to 20mA (application dependent)
Millicandela Rating: 3mcd to 680mcd (brightness selection dependent)
Viewing Angle: 20° to 45° (application dependent)

Substitutes are valid when all primary criteria are met. Secondary parameters may vary based on specific circuit requirements and application brightness/viewing angle specifications.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Current - Test	Millicandela	Viewing Angle	Lens Transparency	Height (Max)	Inventory
3SRC-F	Bivar Inc.	1.7V	20mA	60mcd	20°	Clear	5.30mm	906 Pcs
HLMP-K155	Broadcom Limited	1.7V	1mA	3mcd	45°	Clear	6.35mm	100300 Pcs
HLMP-K105	Broadcom Limited	1.8V	20mA	65mcd	45°	Clear	6.35mm	2300 Pcs
HLMP-K105-J0002	Broadcom Limited	1.8V	20mA	65mcd	45°	Clear	6.35mm	20739 Pcs
HLMP-Y601-J0000	Broadcom Limited	2V	20mA	680mcd	45°	Clear	5.20mm	6519 Pcs
HLMP-Y651-G0000	Broadcom Limited	2V	20mA	300mcd	45°	Clear	5.20mm	2200 Pcs
LTL1CHKEKNN	Lite-On Inc.	2.05V	20mA	680mcd	45°	Clear	5.20mm	34758 Pcs
LTL1CHKRKNN	Lite-On Inc.	2V	20mA	400mcd	45°	Clear	5.20mm	65304 Pcs
151031SS04000	Würth Elektronik	2V	20mA	160mcd	40°	Diffused	5.55mm	1188 Pcs
SLR-343VC3F	Rohm Semiconductor	2V	10mA	25mcd	40°	Clear	5.60mm	8006 Pcs

Engineering Selection Recommendations

Direct Electrical Substitutes (Vf 1.7V - 1.8V range):

HLMP-K105 and HLMP-K105-J0002 provide the closest electrical match to the 3SRC-F, with forward voltage of 1.8V and identical 20mA test current. These components require minimal circuit redesign. HLMP-K105-J0002 offers significantly higher inventory availability in Cut Tape packaging format.

Higher Brightness Alternatives (Vf 2V, 20mA test current):

HLMP-Y601-J0000, HLMP-Y651-G0000, LTL1CHKEKNN, and LTL1CHKRKNN operate at 2V forward voltage with 20mA test current. These components provide increased brightness ratings (300mcd to 680mcd) compared to the 3SRC-F (60mcd). Circuit resistor values must be recalculated to accommodate the 0.3V voltage increase.

Low Current Alternative:

HLMP-K155 operates at 1.7V forward voltage matching the 3SRC-F but specifies 1mA test current with 3mcd brightness. This component is suitable only for applications where reduced brightness and current consumption are acceptable.

Diffused Lens Alternative:

151031SS04000 (Würth Elektronik) provides a diffused lens variant at 2V forward voltage. This component differs from the 3SRC-F in lens transparency (diffused vs. clear) and is suitable only when diffused optical output is specified.

Low Current, Low Brightness Alternative:

SLR-343VC3F (Rohm Semiconductor) operates at 2V with 10mA test current and 25mcd brightness. This component is suitable for applications requiring reduced power consumption.

All substitute parts maintain ROHS3 compliance and active product status. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all components, indicating no special moisture handling requirements.

Frequently Asked Questions (FAQ)

Q: Can HLMP-K105 directly replace 3SRC-F without circuit modification?

A: HLMP-K105 operates at 1.8V forward voltage compared to 3SRC-F at 1.7V. The 0.1V difference is within typical circuit tolerance for LED applications using standard current-limiting resistors. However, the actual voltage drop across the resistor will decrease by approximately 0.1V, resulting in approximately 5% higher LED current. Circuit verification is application-dependent.

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

A: Both parts are electrically identical (1.8V, 20mA, 65mcd). The primary difference is packaging: HLMP-K105 is supplied in Bulk packaging, while HLMP-K105-J0002 is supplied in Cut Tape (CT) format. HLMP-K105-J0002 offers significantly higher inventory (20739 Pcs vs. 2300 Pcs).

Q: Can I use HLMP-Y601-J0000 as a substitute if brightness is not critical?

A: HLMP-Y601-J0000 operates at 2V forward voltage (0.3V higher than 3SRC-F) with 680mcd brightness (11.3x brighter). The higher forward voltage requires resistor recalculation. The significantly increased brightness may not be suitable for applications where the original 60mcd specification was selected for visual balance or power consumption constraints.

Q: Why does 151031SS04000 have a diffused lens while 3SRC-F has a clear lens?

A: 151031SS04000 is specified with a diffused lens, which scatters light over a wider area compared to the clear lens of 3SRC-F. This optical difference affects light distribution and intensity perception. Substitution is valid only when diffused optical output is acceptable for the application.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. This compliance status matches the 3SRC-F requirement and ensures regulatory compatibility for applications subject to ROHS3 restrictions.

Q: What is the impact of different viewing angles on substitution?

A: The 3SRC-F specifies a 20° viewing angle, while most substitutes specify 45°. A wider viewing angle (45°) means light is distributed over a larger cone, resulting in lower peak intensity in the forward direction. Applications requiring narrow-angle light concentration may experience reduced brightness perception with 45° viewing angle substitutes.

Q: Can SLR-343VC3F be used in high-current applications?

A: SLR-343VC3F specifies 10mA test current, compared to 3SRC-F at 20mA. This component is rated for lower current operation and is suitable only for applications where 10mA or less current is acceptable. Operating at 20mA may exceed component ratings.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in Bulk and Cut Tape (CT) packaging formats. HLMP-K105-J0002 and LTL1CHKRKNN offer the highest inventory in their respective packaging formats. Packaging selection depends on assembly process requirements and volume needs.

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