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

Part Overview

The 3SUOC-F is an orange LED indication component manufactured by Bivar Inc., configured as a discrete 1.8V radial through-hole device in T-1 form factor. This part is classified as obsolete, which necessitates identification of functionally equivalent substitute components for ongoing applications requiring orange LED indication in 3mm T-1 through-hole mounting configurations.

The primary reason for identifying substitutes is the obsolete product status, which impacts long-term availability and supply chain continuity. Alternative parts must maintain compatibility with the original electrical and mechanical specifications while offering active product status and improved availability.

Key Parameters

Parameter	3SUOC-F Value	Specification Basis
Manufacturer	Bivar Inc.	Original equipment manufacturer
Color	Orange	Visual indication requirement
Lens Transparency	Clear	Optical transmission characteristic
Lens Size	3mm, T-1	Physical form factor
Voltage - Forward (Vf) Typical	1.8V	Electrical operating parameter
Current - Test	20mA	Standard test condition
Millicandela Rating	400mcd	Luminous intensity
Wavelength - Peak	625nm	Spectral characteristic
Viewing Angle	20°	Directional emission pattern
Mounting Type	Through Hole	PCB assembly method
Package / Case	Radial	Lead configuration
Height (Max)	5.30mm	Physical dimension constraint
Product Status	Obsolete	Lifecycle indicator

Substitute Part Grouping Explanation

Substitute parts for the 3SUOC-F are identified based on strict alignment with the following critical parameters:

Primary Substitution Criteria:

Lens Size: 3mm T-1 form factor (mechanical compatibility)
Mounting Type: Through Hole radial configuration
Color: Orange (functional requirement for indication)
Lens Transparency: Clear (optical requirement)
Package / Case: Radial (lead configuration)

Secondary Compatibility Parameters:

Voltage - Forward (Vf): Range 1.8V to 2.1V (circuit design tolerance)
Current - Test: 10mA to 20mA (operating condition compatibility)
Wavelength - Peak: 605nm to 625nm (orange spectrum range)
Millicandela Rating: 25mcd to 680mcd (brightness variation acceptable within application context)
Viewing Angle: 20° to 45° (directional emission compatibility)
Height (Max): 5.20mm to 5.85mm (PCB clearance tolerance)

Substitute Parts Meeting All Criteria:

LTL1CHKFKNN (Lite-On Inc.) - Orange clear T-1, 2.05V, 320mcd, 45° viewing angle
HLMP-Y901-J0000 (Broadcom Limited) - Orange clear T-1, 2V, 680mcd, 45° viewing angle
SLR-342DC3F (Rohm Semiconductor) - Orange clear T-1, 2V, 25mcd, 40° viewing angle

These parts satisfy all primary and secondary substitution criteria while offering active product status or improved availability compared to the obsolete 3SUOC-F.

Parameter Comparison

Parameter	3SUOC-F	LTL1CHKFKNN	HLMP-Y901-J0000	SLR-342DC3F
Manufacturer	Bivar Inc.	Lite-On Inc.	Broadcom Limited	Rohm Semiconductor
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) Typical	1.8V	2.05V	2V	2V
Current - Test	20mA	20mA	20mA	10mA
Millicandela Rating	400mcd	320mcd	680mcd	25mcd
Wavelength - Peak	625nm	611nm	611nm	—
Viewing Angle	20°	45°	45°	40°
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial
Height (Max)	5.30mm	5.20mm	5.20mm	5.40mm
Product Status	Obsolete	Active	Active	Not For New Designs
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	958 Pcs	44458 Pcs	817 Pcs	2913 Pcs

Engineering Selection Recommendations

LTL1CHKFKNN (Lite-On Inc.) - Primary Recommendation

This part is the optimal substitute based on the following factors:

Active product status ensures long-term availability and supply chain continuity
ROHS3 compliance aligns with modern manufacturing standards
Highest inventory availability (44,458 pieces) provides supply security
Forward voltage of 2.05V is within acceptable circuit design tolerance
Millicandela rating of 320mcd closely matches the original 400mcd specification
Viewing angle of 45° provides broader emission pattern than the original 20°
Physical dimensions (5.20mm height) are compatible with PCB clearance requirements
Wavelength peak of 611nm maintains orange spectrum consistency

HLMP-Y901-J0000 (Broadcom Limited) - Secondary Recommendation

This part serves as an alternative substitute with the following characteristics:

Active product status supports ongoing production requirements
ROHS3 compliance meets regulatory requirements
Highest millicandela rating (680mcd) among substitutes, providing enhanced brightness
Forward voltage of 2V is within acceptable tolerance
Viewing angle of 45° matches LTL1CHKFKNN
Physical dimensions (5.20mm height) are compatible with PCB constraints
Wavelength peak of 611nm maintains orange spectrum consistency
Lower inventory availability (817 pieces) compared to LTL1CHKFKNN

SLR-342DC3F (Rohm Semiconductor) - Tertiary Option

This part is available as a substitute with the following considerations:

Product status is "Not For New Designs," indicating end-of-life trajectory
ROHS3 compliance is maintained
Adequate inventory availability (2,913 pieces)
Forward voltage of 2V is within acceptable tolerance
Millicandela rating of 25mcd is significantly lower than the original specification
Viewing angle of 40° provides moderate emission pattern
Physical dimensions (5.40mm height) remain within PCB clearance tolerance
This option is suitable only for applications where reduced brightness is acceptable

Frequently Asked Questions (FAQ)

Q1: Can LTL1CHKFKNN directly replace 3SUOC-F without circuit modification?

A: LTL1CHKFKNN can replace 3SUOC-F in most applications. The forward voltage difference (2.05V versus 1.8V) requires verification of circuit design margins. If the original circuit was designed with tight voltage tolerance, current-limiting resistor values may require adjustment to maintain consistent LED brightness at the specified 20mA test current.

Q2: What is the significance of the viewing angle difference between 3SUOC-F (20°) and substitute parts (40-45°)?

A: The original 3SUOC-F has a narrow 20° viewing angle, providing focused directional indication. Substitute parts with 40-45° viewing angles provide broader emission patterns. This difference is acceptable in applications where wider visibility is beneficial or neutral. For applications requiring narrow directional indication, the broader viewing angle may affect the intended optical performance.

Q3: Why does SLR-342DC3F have significantly lower millicandela rating (25mcd) compared to 3SUOC-F (400mcd)?

A: The millicandela rating represents luminous intensity at the specified test current. SLR-342DC3F operates at 10mA test current versus 20mA for the original part, resulting in lower brightness output. This part is suitable only for applications where reduced brightness is acceptable or where the circuit operates at lower current levels.

Q4: Are all substitute parts ROHS3 compliant?

A: Yes, all three recommended substitute parts (LTL1CHKFKNN, HLMP-Y901-J0000, and SLR-342DC3F) are ROHS3 compliant. The original 3SUOC-F does not specify RoHS compliance status. Substitution with ROHS3-compliant parts ensures alignment with modern manufacturing and environmental regulations.

Q5: What is the impact of forward voltage variation on circuit design?

A: The original 3SUOC-F operates at 1.8V forward voltage. Substitute parts operate at 2V to 2.05V. This 0.2-0.25V increase requires verification that the circuit power supply and current-limiting resistor design accommodate this variation. In series resistor circuits, the voltage drop across the resistor will decrease proportionally, potentially affecting LED brightness consistency.

Q6: Can substitute parts be used interchangeably in existing PCB designs?

A: All substitute parts maintain the same T-1 through-hole radial package configuration and physical dimensions within acceptable tolerance (5.20-5.40mm height). PCB footprints designed for 3SUOC-F are mechanically compatible with all substitute parts. Electrical circuit verification is required to confirm forward voltage and current compatibility.

Q7: Which substitute part offers the best long-term availability?

A: LTL1CHKFKNN offers the best long-term availability based on active product status and highest inventory level (44,458 pieces). HLMP-Y901-J0000 maintains active status with adequate inventory (817 pieces). SLR-342DC3F is marked "Not For New Designs," indicating potential future discontinuation despite current inventory availability (2,913 pieces).

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message