3SUOC-S Orange LED T-1 Equivalent & Substitute Parts

Part Overview

The 3SUOC-S is an orange LED indication component manufactured by Bivar Inc., configured as a discrete 1.8V radial through-hole device with a 3mm T-1 clear lens. This part is classified as obsolete, necessitating identification of functionally equivalent substitute components for ongoing circuit support and new design implementations. The orange wavelength specification (625nm peak) and 400mcd brightness rating define the primary performance envelope for substitute selection.

Key Parameters

Parameter	3SUOC-S Value
Manufacturer	Bivar Inc.
Color	Orange
Lens Type	Round with Domed Top, Clear
Lens Size	3mm T-1
Forward Voltage (Vf)	1.8V (Typical)
Test Current	20mA
Millicandela Rating	400mcd
Peak Wavelength	625nm
Viewing Angle	30°
Mounting Type	Through Hole (Radial)
Height (Max)	4.50mm
Product Status	Obsolete
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitute components are identified based on three critical compatibility criteria:

Wavelength & Color Requirements: The 3SUOC-S operates in the orange spectrum (625nm). Substitute parts must maintain orange wavelength characteristics to preserve visual indication consistency. Yellow-wavelength alternatives (588–592nm) are functionally distinct and listed for reference but do not provide color equivalence.
Electrical Parameters: Forward voltage tolerance range (1.8V–2.1V) and test current (10mA–20mA) define circuit compatibility. Parts operating within this envelope permit direct substitution in current-limiting circuits.
Mechanical & Optical Compatibility: Through-hole radial mounting, 3mm lens diameter, round domed lens style, and clear or colorless lens transparency ensure physical and optical interchangeability.

Direct Orange Substitutes (Color-Compatible):

SLR-342DC3F: Orange 605nm, 2V forward voltage, 25mcd, clear lens, T-1 radial

Alternative Color Options (Yellow Wavelength, for reference only):

151031YS06000: Yellow 590nm, 2V forward voltage, 110mcd, diffused lens
LTL-4256N: Yellow 588nm, 2.1V forward voltage, 40mcd, clear lens
LTL1CHKSKNN: Yellow 590nm, 2.05V forward voltage, 320mcd, clear lens
SLR-343YC3F: Yellow 585nm, 2.1V forward voltage, 16mcd, yellow lens

Parameter Comparison

Parameter	3SUOC-S	SLR-342DC3F	151031YS06000	LTL-4256N	LTL1CHKSKNN	SLR-343YC3F
Manufacturer	Bivar Inc.	Rohm Semiconductor	Würth Elektronik	Lite-On Inc.	Lite-On Inc.	Rohm Semiconductor
Color	Orange	Orange	Yellow	Yellow	Yellow	Yellow
Peak Wavelength	625nm	605nm	592nm	585nm	591nm	585nm
Forward Voltage (Vf)	1.8V	2.0V	2.0V	2.1V	2.05V	2.1V
Test Current	20mA	10mA	20mA	10mA	20mA	10mA
Millicandela Rating	400mcd	25mcd	110mcd	40mcd	320mcd	16mcd
Lens Type	Round Domed, Clear	Round Domed, Clear	Round Domed, Yellow Diffused	Round Domed, Clear	Round Domed, Clear	Round Domed, Yellow Clear
Lens Size	3mm T-1	3.10mm Dia	3.00mm Dia	3mm T-1	3.10mm Dia	3.10mm Dia
Viewing Angle	30°	40°	60°	45°	45°	40°
Height (Max)	4.50mm	5.40mm	5.55mm	5.85mm	5.20mm	5.60mm
Product Status	Obsolete	Not For New Designs	Active	Active	Active	Not For New Designs
Mounting Type	Through Hole Radial	Through Hole Radial	Through Hole Radial	Through Hole Radial	Through Hole Radial	Through Hole Radial

Engineering Selection Recommendations

For Orange Wavelength Preservation: SLR-342DC3F from Rohm Semiconductor is the only listed substitute maintaining orange color equivalence. However, this part is classified as "Not For New Designs," limiting its applicability to legacy system repair. Forward voltage (2.0V) requires minor circuit adjustment from the 3SUOC-S baseline (1.8V). The 25mcd brightness is significantly reduced compared to the original 400mcd specification, necessitating circuit redesign if brightness is a functional requirement.

For Active Product Status: Yellow-wavelength alternatives (151031YS06000, LTL-4256N, LTL1CHKSKNN) offer active manufacturing status. These parts introduce color substitution and therefore suit applications where yellow indication replaces orange function. LTL1CHKSKNN delivers the closest brightness match (320mcd) to the original specification while maintaining RoHS3 compliance and unlimited moisture sensitivity rating.

For RoHS3 Compliance: All substitute parts except SLR-343YC3F carry explicit RoHS3 Compliant designation, supporting regulatory compatibility with modern assembly standards.

Frequently Asked Questions (FAQ)

Q: Can SLR-342DC3F directly replace 3SUOC-S in existing circuits? A: SLR-342DC3F provides the closest orange wavelength match (605nm vs. 625nm), but forward voltage differs (2.0V vs. 1.8V). Circuits with fixed current sources or wide voltage tolerance accommodate this shift. Brightness reduction (25mcd vs. 400mcd) may require circuit analysis to confirm visual indication adequacy.

Q: What is the difference between orange and yellow LED substitutes? A: Orange wavelength (605–625nm) and yellow wavelength (585–592nm) produce distinct colors. The 3SUOC-S specifies orange; yellow substitutes are functionally different and appropriate only when application logic permits color change without impact to circuit function or human-machine interface.

Q: Do all substitutes fit the same PCB footprint? A: All listed substitutes use through-hole radial mounting (T-1 package family) with compatible 3mm lens sizes. Height variation ranges from 4.50mm to 5.85mm; circuit board clearance and potting depth must accommodate maximum height tolerance.

Q: Which substitute offers the best brightness match? A: LTL1CHKSKNN delivers 320mcd against the 3SUOC-S baseline of 400mcd, representing the closest luminous intensity match within the active product catalog. If yellow wavelength is acceptable, this part aligns brightness-critical applications most closely to original specification.

Q: Are all substitutes RoHS compliant? A: Five of six listed substitutes carry RoHS3 Compliant designation. SLR-343YC3F compliance status is not specified in provided documentation. For regulatory-constrained applications, select from the explicit RoHS3-compliant subset.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message