3HC-F Red LED Clear T-1 Through Hole Equivalent & Substitute Parts

Part Overview

The Bivar Inc. 3HC-F is a red LED indicator component featuring a clear lens with 50mcd brightness, designed for through-hole mounting applications. The part operates at 2V forward voltage with a 20mA test current and provides a 20° viewing angle. This component is classified as obsolete, making equivalent and substitute parts necessary for circuit design continuity and procurement planning. Substitute parts maintain compatibility through matching electrical specifications, mechanical form factors, and lens characteristics while offering active product status alternatives.

Key Parameters

Parameter	3HC-F Value
Manufacturer	Bivar Inc.
Color	Red
Lens Transparency	Clear
Lens Size	3mm, T-1
Voltage - Forward (Vf) (Typ)	2V
Current - Test	20mA
Millicandela Rating	50mcd
Viewing Angle	20°
Mounting Type	Through Hole
Wavelength - Peak	625nm
Package / Case	Radial
Height (Max)	5.30mm
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 3HC-F is determined by the following critical parameters: lens transparency (clear), forward voltage (2V), test current (20mA), lens size (3mm T-1), mounting type (through hole), and wavelength-peak compatibility (625nm region). Parts are grouped into two substitution categories based on electrical and optical characteristics:

Category 1 - Direct Voltage & Optical Match (2V, Clear Lens): Parts with identical 2V forward voltage and clear lens transparency matching the original 625nm peak wavelength region. These parts maintain the electrical operating point and optical clarity of the 3HC-F.

Category 2 - Parametric Equivalents (Voltage-Tolerant Alternatives): Parts with forward voltages of 1.7V-2.05V and clear lens transparency that operate within acceptable circuit tolerance windows while maintaining 3mm T-1 through-hole form factor. These parts provide electrical and mechanical substitution for designs with flexible voltage specifications.

Parts with diffused lens transparency (3HD-F, 151031SS04000) are not suitable substitutes due to lens transparency mismatch, despite other compatible parameters.

Parameter Comparison

Part Number	Manufacturer	Lens Transparency	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Wavelength - Peak	Height (Max)	Product Status	RoHS Status
3HC-F	Bivar Inc.	Clear	2V	20mA	50mcd	20°	625nm	5.30mm	Obsolete	N/A
3SRC-F	Bivar Inc.	Clear	1.7V	20mA	60mcd	20°	645nm	5.30mm	Active	ROHS3 Compliant
1224-10SURC/S530-A3	Everlight Electronics Co Ltd	Clear	2V	20mA	400mcd	20°	632nm	5.50mm	Active	N/A
HLMP-K105	Broadcom Limited	Clear	1.8V	20mA	65mcd	45°	645nm	6.35mm	Active	ROHS3 Compliant
HLMP-K105-J0002	Broadcom Limited	Clear	1.8V	20mA	65mcd	45°	645nm	6.35mm	Active	ROHS3 Compliant
HLMP-K155	Broadcom Limited	Clear	1.7V	1mA	3mcd	45°	660nm	6.35mm	Active	ROHS3 Compliant
HLMP-Y601-J0000	Broadcom Limited	Clear	2V	20mA	680mcd	45°	633nm	5.20mm	Active	ROHS3 Compliant
HLMP-Y651-G0000	Broadcom Limited	Clear	2V	20mA	300mcd	45°	652nm	5.20mm	Active	ROHS3 Compliant
LTL1CHKEKNN	Lite-On Inc.	Clear	2.05V	20mA	680mcd	45°	632nm	5.20mm	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Selection - Direct Voltage Match: The HLMP-Y601-J0000 (Broadcom Limited) and HLMP-Y651-G0000 (Broadcom Limited) provide the closest electrical match with identical 2V forward voltage and 20mA test current. Both parts are ROHS3 compliant and classified as active products, eliminating obsolescence risk. The HLMP-Y601-J0000 offers 680mcd brightness compared to the 3HC-F's 50mcd, providing increased luminous intensity while maintaining the clear lens specification.

Alternative Selection - Voltage-Tolerant Designs: The 3SRC-F (Bivar Inc.) operates at 1.7V forward voltage within the same product family and maintains clear lens transparency. This part is ROHS3 compliant and active. For designs with flexible voltage specifications accepting 1.7V-1.8V operation, the HLMP-K105 and HLMP-K105-J0002 (Broadcom Limited, both ROHS3 compliant) provide 65mcd brightness in active product status with extended viewing angle (45°).

High-Brightness Alternative: The 1224-10SURC/S530-A3 (Everlight Electronics Co Ltd) matches the 2V voltage and clear lens specification while delivering 400mcd brightness. This part accommodates applications requiring increased luminous intensity without voltage adjustment.

Not Recommended: The HLMP-K155 exhibits significantly reduced test current (1mA versus 20mA) and millicandela rating (3mcd versus 50mcd), making it unsuitable for standard indicator applications matching the 3HC-F specification.

Frequently Asked Questions (FAQ)

Q: Can the 3HC-F be replaced with the 3HD-F from Bivar Inc.? A: No. While both Bivar Inc. parts are 3mm T-1 red LEDs at 2V, the 3HD-F has a diffused lens (red-colored), whereas the 3HC-F requires a clear lens. Lens transparency is a critical optical parameter determining indicator visibility characteristics and cannot be substituted.

Q: What is the difference between 1mA and 20mA test current in the HLMP-K155? A: Test current specification defines the operating point at which brightness is measured. The HLMP-K155 with 1mA test current produces 3mcd brightness, while the 3HC-F at 20mA produces 50mcd. These parts operate in different brightness classes and are not interchangeable for standard indicator applications.

Q: Are the HLMP-K105 and HLMP-K105-J0002 electrically identical? A: Yes. Both parts are identical in electrical parameters, brightness, and form factor. The difference is packaging: HLMP-K105 is bulk packaging, while HLMP-K105-J0002 is cut tape. Selection depends on procurement and assembly requirements. Both are ROHS3 compliant and active products.

Q: Can parts with 1.7V-1.8V forward voltage be used in circuits designed for 2V operation? A: Parts with reduced forward voltage (3SRC-F at 1.7V, HLMP-K105 at 1.8V) operate at lower voltage drops, reducing voltage stress across series resistors. Substitution is circuit-dependent. If the circuit uses a resistor-limited design, reduced forward voltage increases current through the LED, potentially reducing lifespan. Circuit redesign verification is necessary.

Q: Which substitute offers the best compliance status? A: All active substitute parts listed (3SRC-F, 1224-10SURC/S530-A3, HLMP-K105, HLMP-K105-J0002, HLMP-K155, HLMP-Y601-J0000, HLMP-Y651-G0000, LTL1CHKEKNN) are currently manufactured with active product status. ROHS3 compliance is confirmed for Bivar Inc., Broadcom Limited, and Lite-On Inc. parts. Everlight Electronics Co Ltd part compliance status is not provided in the specification data.

Q: What is the viewing angle impact when selecting HLMP-K105 or HLMP-Y601-J0000? A: The 3HC-F specifies 20° viewing angle, while HLMP-K105, HLMP-Y601-J0000, and HLMP-Y651-G0000 specify 45° viewing angle. A wider viewing angle distributes light over a larger area, reducing perceived brightness from direct angles but improving visibility from oblique angles. Application context determines suitability.

Q: Are there mechanical form factor differences between 3HC-F and substitute parts? A: All substitute parts maintain 3mm T-1 through-hole mounting with similar body heights (5.20mm-6.35mm), compatible with standard through-hole PCB designs. Mechanical compatibility is maintained across all listed substitutes.

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