SLR-342DCT32 Equivalent & Substitute Parts

Part Overview

The SLR-342DCT32 is an orange 605nm LED indicator from Rohm Semiconductor, designed for through-hole mounting in discrete indication applications. This part operates at 2V forward voltage with a 25mcd brightness rating and features a clear, domed lens in a T-1 radial package. The product is classified as Not For New Designs, making identification of active equivalent alternatives essential for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	SLR-342DCT32
Manufacturer	Rohm Semiconductor
Color	Orange
Wavelength - Dominant	605nm
Voltage - Forward (Vf) (Typ)	2V
Current - Test	10mA
Millicandela Rating	25mcd
Lens Style	Round with Domed Top
Lens Size	3.10mm Dia
Viewing Angle	40°
Mounting Type	Through Hole
Package / Case	Radial
Supplier Device Package	T-1
Height (Max)	5.40mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution of the SLR-342DCT32 is determined by the following critical parameters:

Primary Matching Criteria:

Color: Orange
Wavelength - Dominant: 605nm (±10nm tolerance acceptable for indication applications)
Voltage - Forward (Vf): 2V to 2.1V range
Mounting Type: Through Hole
Package / Case: Radial (T-1)
Lens Style: Round with Domed Top

Secondary Compatibility Factors:

Millicandela Rating: 15mcd to 80mcd (brightness variation acceptable depending on circuit design)
Viewing Angle: 30° to 80° (application-dependent)
Height (Max): 4.45mm to 6.35mm (PCB clearance dependent)
Current - Test: 10mA to 20mA (circuit design dependent)

Substitute parts are grouped into two categories:

Category 1 - Direct Orange 605nm Substitutes (Preferred): Parts matching orange color and 605nm wavelength with active product status and modern packaging options.

Category 2 - Alternative Color/Wavelength Substitutes: Yellow and alternative orange wavelength parts provided for applications where color or wavelength flexibility exists. These require circuit validation.

Parameter Comparison

Part Number	Manufacturer	Color	Wavelength (nm)	Vf (Typ)	Current - Test (mA)	Millicandela	Viewing Angle	Height (Max)	Product Status	Packaging
SLR-342DCT32	Rohm Semiconductor	Orange	605	2V	10	25	40°	5.40mm	Not For New Designs	Tape & Reel (TR)
SLR-343DCT32	Rohm Semiconductor	Orange	605	2V	10	25	40°	5.60mm	Active	Tape & Box (TB)
HLMP-Y402-G0000	Broadcom Limited	Orange	605	2.1V	20	29	45°	5.20mm	Active	Bulk
WP132XNT	Kingbright	Orange	602	2.05V	20	20	50°	5.20mm	Active	Bulk
3294-15USOC/S530-A3	Everlight Electronics Co Ltd	Orange	615	2V	20	80	80°	4.45mm	Active	-
HLMP-1420	Broadcom Limited	Yellow	585	2V	10	15	45°	6.35mm	Active	Bulk
HLMP-1421	Broadcom Limited	Yellow	585	2V	10	15	45°	6.35mm	Active	Bulk
HLMP-1421-F0002	Broadcom Limited	Yellow	585	2V	10	15	45°	6.35mm	Active	Tape & Reel (TR)
SSL-LX3044YT	Lumex Opto/Components Inc.	Yellow	585	2.1V	20	90	30°	4.60mm	Active	Bulk
SSL-LX3054YT	Lumex Opto/Components Inc.	Yellow	585	2.1V	20	90	30°	5.25mm	Active	-
LTL1CHJSTNN	Lite-On Inc.	Yellow	587	2.05V	20	180	45°	5.20mm	Active	-

Engineering Selection Recommendations

Primary Substitute - SLR-343DCT32 (Rohm Semiconductor): Direct equivalent from the same manufacturer with identical electrical specifications. Active product status ensures long-term availability. Height variance of 0.20mm is negligible for through-hole applications. Tape & Box packaging differs from original Tape & Reel but maintains component integrity. ROHS3 compliant with unlimited MSL rating.

Secondary Substitute - HLMP-Y402-G0000 (Broadcom Limited): Orange 605nm LED with active status and high inventory availability. Forward voltage of 2.1V and test current of 20mA require circuit validation but remain within acceptable tolerance for 2V-rated designs. Brightness of 29mcd exceeds original 25mcd specification. ROHS3 compliant with unlimited MSL rating.

Alternative Substitute - WP132XNT (Kingbright): Orange LED with 602nm wavelength (within acceptable tolerance of 605nm). Active product status with bulk packaging. Forward voltage of 2.05V and test current of 20mA require circuit validation. Brightness of 20mcd is slightly lower than original specification. ROHS3 compliant with unlimited MSL rating.

High-Brightness Alternative - 3294-15USOC/S530-A3 (Everlight Electronics Co Ltd): Orange LED with 615nm wavelength and significantly higher brightness of 80mcd. Suitable for applications requiring enhanced visibility. Wider viewing angle of 80° and lower height of 4.45mm provide design flexibility. Forward voltage of 2V matches original specification. ROHS3 compliant with unlimited MSL rating.

Color-Flexible Alternatives (Yellow LEDs): HLMP-1420, HLMP-1421, HLMP-1421-F0002, SSL-LX3044YT, SSL-LX3054YT, and LTL1CHJSTNN are yellow alternatives suitable only for applications where color substitution is acceptable. All maintain 2V forward voltage range and through-hole radial mounting. ROHS3 compliant with unlimited MSL rating.

Frequently Asked Questions (FAQ)

Q: Can SLR-343DCT32 directly replace SLR-342DCT32? A: Yes. Both parts are from Rohm Semiconductor with identical electrical specifications (2V, 10mA, 25mcd, 605nm). The height difference of 0.20mm and packaging format change (Tape & Box vs. Tape & Reel) do not affect electrical compatibility or through-hole mounting.

Q: What is the acceptable wavelength tolerance for orange LED substitution? A: Orange LEDs in the 602nm to 615nm range are acceptable for indication applications. The SLR-342DCT32 operates at 605nm. WP132XNT (602nm) and 3294-15USOC/S530-A3 (615nm) fall within this tolerance but require visual consistency validation in the final application.

Q: Can I use HLMP-Y402-G0000 as a direct replacement? A: HLMP-Y402-G0000 is electrically compatible with forward voltage of 2.1V and test current of 20mA, both within acceptable ranges for 2V-rated circuits. However, the higher test current and brightness (29mcd vs. 25mcd) require circuit validation to ensure proper current limiting and desired brightness level.

Q: Are yellow LED substitutes electrically compatible? A: Yellow LEDs (HLMP-1420, HLMP-1421, SSL-LX3044YT, SSL-LX3054YT, LTL1CHJSTNN) maintain 2V forward voltage and through-hole radial mounting. Electrical compatibility is confirmed, but color substitution requires application approval since indication color changes from orange to yellow.

Q: What packaging options are available for active substitutes? A: SLR-343DCT32 is available in Tape & Box format. HLMP-1421-F0002 is available in Tape & Reel. Most other active substitutes are supplied in Bulk packaging. Packaging selection depends on production volume and handling requirements.

Q: Do all substitute parts meet RoHS3 compliance? A: Yes. All listed substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the original SLR-342DCT32 specifications.

Q: What is the height constraint for PCB clearance? A: The SLR-342DCT32 has a maximum height of 5.40mm. Substitute parts range from 4.45mm to 6.35mm. Verify PCB clearance requirements before selecting parts with heights exceeding 5.40mm.

Q: Can I use higher brightness alternatives like LTL1CHJSTNN (180mcd)? A: Higher brightness LEDs require circuit validation to ensure proper current limiting and prevent over-driving. The original design may not accommodate 180mcd brightness without circuit modification.

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