3UOC-F Orange LED T-1 Through Hole - Equivalent & Substitute Parts

Part Overview

The Bivar Inc. 3UOC-F is an orange LED indication component featuring a 3mm T-1 through-hole form factor with a clear, domed lens. This discrete radial LED operates at 1.8V forward voltage with a 300mcd brightness rating and 20° viewing angle. The product status is obsolete, necessitating the identification of functionally compatible substitute components for ongoing circuit support and new design implementations. Substitute parts must maintain through-hole mounting compatibility, similar form factor characteristics, and comparable electrical operating parameters within acceptable tolerance ranges.

Key Parameters

Parameter	Value
Manufacturer Part Number	3UOC-F
Manufacturer	Bivar Inc.
Description	LED ORANGE CLEAR T-1 T/H
Product Status	Obsolete
Color	Orange
Lens Color	Colorless
Lens Transparency	Clear
Lens Size	3mm, T-1
Lens Style	Round with Domed Top
Voltage - Forward (Vf) (Typ)	1.8V
Current - Test	20mA
Millicandela Rating	300mcd
Wavelength - Peak	625nm
Viewing Angle	20°
Mounting Type	Through Hole
Package / Case	Radial
Supplier Device Package	T-1
Height (Max)	5.30mm
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute compatibility is determined by the following critical parameters:

Form Factor & Mounting Compatibility:

Lens size: 3mm T-1 through-hole radial package
Mounting type: Through-hole configuration
Physical height: Approximately 5.20mm to 5.85mm maximum

Electrical Operating Parameters:

Forward voltage (Vf): Range 1.8V to 2.1V
Test current: 10mA to 20mA
Color classification: Orange or functionally similar wavelength (600nm–630nm range)

Optical Characteristics:

Lens transparency: Clear or diffused options
Millicandela rating: Comparable brightness levels (25mcd to 680mcd acceptable depending on application)
Viewing angle: 20° to 60° range

Substitutes are identified from the provided list based on matching these mechanical and electrical constraints. Parts with differing colors (yellow variants) are included where electrical and mechanical parameters align, enabling application-specific selection based on optical requirements.

Parameter Comparison

Parameter	3UOC-F (Bivar)	LTL1CHKFKNN (Lite-On)	HLMP-Y901-J0000 (Broadcom)	SLR-342DC3F (Rohm)
Product Status	Obsolete	Active	Active	Not For New Designs
Color	Orange	Orange	Orange	Orange
Lens Transparency	Clear	Clear	Clear	Clear
Lens Size	3mm, T-1	3mm, T-1	3mm, T-1	3.10mm Dia
Voltage - Forward (Vf) (Typ)	1.8V	2.05V	2V	2V
Current - Test	20mA	20mA	20mA	10mA
Millicandela Rating	300mcd	320mcd	680mcd	25mcd
Wavelength - Peak	625nm	611nm	611nm	—
Viewing Angle	20°	45°	45°	40°
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Height (Max)	5.30mm	5.20mm	5.20mm	5.40mm
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute (Active Status): LTL1CHKFKNN (Lite-On Inc.) is recommended as the primary substitute. This component maintains active product status with ROHS3 compliance and unlimited moisture sensitivity rating. Electrical parameters are closely matched: forward voltage of 2.05V versus the original 1.8V represents a 0.25V increase within acceptable design tolerance for most LED indicator circuits. Millicandela rating of 320mcd closely approximates the original 300mcd specification. The component shares identical T-1 form factor and through-hole mounting configuration with maximum height of 5.20mm.

Secondary Substitute (Active Status, Higher Brightness): HLMP-Y901-J0000 (Broadcom Limited) provides an alternative with active product status and ROHS3 compliance. This substitute delivers higher luminous intensity at 680mcd with 2V forward voltage. The increased brightness may require resistor value adjustment in existing circuits. This option is suitable for applications where visibility enhancement is beneficial.

Alternative (Functionally Equivalent): SLR-342DC3F (Rohm Semiconductor) is available with ROHS3 compliance but carries "Not For New Designs" status. This component operates at 2V with 10mA test current versus the original 20mA specification. The reduced brightness rating of 25mcd indicates this option is limited to applications not requiring the original component's optical output level.

Frequently Asked Questions (FAQ)

Q: Can LTL1CHKFKNN be used as a direct replacement in existing 3UOC-F designs? A: Direct board-level substitution is feasible due to identical T-1 through-hole form factor and radial package configuration. However, circuit designers must verify that the forward voltage increase from 1.8V to 2.05V is accommodated by the series resistor network. If the original circuit was designed with minimal voltage headroom, resistor recalculation may be necessary to maintain target LED current levels.

Q: What is the primary difference between LTL1CHKFKNN and HLMP-Y901-J0000? A: Both components share the T-1 form factor, clear orange lens, and active product status. The key distinction is luminous intensity: LTL1CHKFKNN operates at 320mcd while HLMP-Y901-J0000 delivers 680mcd. Selection depends on application visibility requirements and acceptable power dissipation levels in the limiting resistor.

Q: Why are yellow LED options listed in the substitute list? A: Yellow LED variants (151031YS06000, LTL1CHKSKNN, SLR-343YC3F) are provided as alternatives where the optical color requirement permits substitution. These components maintain compatible through-hole mounting, radial package configuration, and electrical operating ranges. Selection of yellow variants requires confirmation that the circuit application does not mandate orange wavelength output.

Q: Is SLR-342DC3F suitable for new circuit designs? A: SLR-342DC3F carries "Not For New Designs" status, indicating Rohm Semiconductor intends to discontinue this component. This option is limited to supporting existing products or legacy systems. New circuit designs should prioritize LTL1CHKFKNN or HLMP-Y901-J0000, both with active product status.

Q: How do viewing angle differences affect substitution? A: The original 3UOC-F operates at 20° viewing angle, while primary substitutes (LTL1CHKFKNN, HLMP-Y901-J0000) operate at 45°. The wider viewing angle in substitutes produces a broader light distribution pattern. Applications requiring focused narrow-angle illumination may require circuit geometry or optical housing modifications to achieve equivalent visual effect.

Q: What packaging format is standard for these T-1 through-hole LEDs? A: All listed substitutes are supplied in bulk packaging format. The T-1 designation refers to the 3mm diameter lens with domed top form factor, standardized across through-hole LED manufacturing. The radial package configuration provides dual leads suitable for standard PCB mounting with no orientation constraints beyond polarity marking.

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