SLR-342MCT32 Equivalent & Substitute Parts

Part Overview

The SLR-342MCT32 is a green LED indication component manufactured by Rohm Semiconductor, featuring a 572nm dominant wavelength and 2.1V forward voltage in a T-1 through-hole radial package. This part is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Finding equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support legacy system maintenance where this component is currently deployed.

Key Parameters

Parameter	Value
Manufacturer Part Number	SLR-342MCT32
Manufacturer	Rohm Semiconductor
Color	Green
Wavelength - Dominant	572nm
Voltage - Forward (Vf) (Typ)	2.1V
Current - Test	10mA
Millicandela Rating	25mcd
Viewing Angle	40°
Lens Size	3.10mm Dia
Mounting Type	Through Hole
Package / Case	Radial
Supplier Device Package	T-1
Height (Max)	5.40mm
RoHS Status	ROHS3 Compliant
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution of the SLR-342MCT32 is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Color: Green
Mounting Type: Through Hole
Package / Case: Radial
Supplier Device Package: T-1 or compatible 3mm form factor
Voltage - Forward (Vf): 2.0V to 2.2V range
Wavelength - Dominant: 565nm to 575nm range (green spectrum)
Lens Transparency: Clear

Secondary Compatibility Factors:

Millicandela Rating: 20mcd to 240mcd (brightness variations acceptable for indication applications)
Viewing Angle: 40° to 80° (wider angles maintain visibility)
Current - Test: 10mA to 20mA (standard test conditions)
Height (Max): 5.0mm to 6.35mm (PCB clearance dependent)

Substitute parts are grouped into two categories: Parametric Equivalents (direct replacements with minimal parameter variance) and Similar Parts (functionally compatible with acceptable parameter differences for indication applications).

Parameter Comparison

Parameter	SLR-342MCT32	SLR-343MCT32	HLMP-1520	HLMP-1521	HLMP-1521-E0002	HLMP-Y502-F0000	HLMP-Y802-F0000	LTL-1CHGE	LTL-1KHGE	LTL1CHJGTNN	484-10SYGT/S530-E2
Manufacturer	Rohm Semiconductor	Rohm Semiconductor	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Lite-On Inc.	Lite-On Inc.	Lite-On Inc.	Everlight Electronics Co Ltd
Color	Green	Green	Green	Green	Green	Green	Green	Green	Green	Green	Yellow-Green
Wavelength - Dominant (nm)	572	—	569	569	569	573	572	573	569	572	573
Wavelength - Peak (nm)	—	563	565	565	565	565	575	565	565	575	575
Voltage - Forward (Vf) (Typ)	2.1V	2.1V	2.1V	2.1V	2.1V	2.2V	2.1V	2.1V	2.1V	2.05V	2.0V
Current - Test (mA)	10	10	10	10	10	20	20	20	20	20	20
Millicandela Rating (mcd)	25	25	22	22	22	40	240	40	29	180	12.5
Viewing Angle (°)	40	40	45	45	45	55	45	45	75	45	80
Lens Size	3.10mm Dia	3.10mm Dia	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1	3.10mm Dia	3.10mm Dia	3mm, T-1	3.00mm Dia
Lens Style	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Flat Top
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial
Supplier Device Package	T-1	T-1	T-1	T-1	T-1	T-1	T-1	—	—	—	3.0mm Wide Angle
Height (Max) (mm)	5.40	5.60	6.35	6.35	6.35	5.20	5.20	5.20	5.00	5.20	4.10
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

SLR-343MCT32 is the primary equivalent for SLR-342MCT32. Both parts share identical electrical characteristics (2.1V forward voltage, 10mA test current, 25mcd brightness, 40° viewing angle) and mechanical form factor (T-1 radial package, 3.10mm lens diameter). SLR-343MCT32 is Active status, making it the preferred choice for design continuity. The only variance is peak wavelength specification (563nm vs. unspecified), which does not affect functional compatibility for indication applications.

Active Broadcom Alternatives (HLMP Series):

HLMP-1520, HLMP-1521, and HLMP-1521-E0002 are functionally compatible substitutes. All three maintain 2.1V forward voltage, 10mA test current, and T-1 radial package configuration. Brightness is slightly lower (22mcd vs. 25mcd), and viewing angle is marginally wider (45° vs. 40°). Height variance (6.35mm vs. 5.40mm) requires PCB clearance verification. HLMP-1521-E0002 differs only in packaging format (Tape & Reel vs. Cut Tape). All three are Active status with ROHS3 compliance.

Higher Brightness Alternatives (HLMP-Y502-F0000, HLMP-Y802-F0000):

These parts provide increased brightness (40mcd and 240mcd respectively) while maintaining 2.1V to 2.2V forward voltage and T-1 package compatibility. HLMP-Y502-F0000 operates at 2.2V and 20mA test current; HLMP-Y802-F0000 operates at 2.1V and 20mA test current. Both are suitable where higher luminous intensity is acceptable or required. Height is reduced (5.20mm), improving PCB clearance.

Lite-On Alternatives (LTL Series):

LTL-1CHGE, LTL-1KHGE, and LTL1CHJGTNN provide compatible green LED indication with 2.1V to 2.05V forward voltage and through-hole radial mounting. Brightness ranges from 29mcd to 180mcd. LTL-1CHGE and LTL1CHJGTNN offer higher brightness (40mcd and 180mcd) suitable for applications requiring enhanced visibility. All maintain ROHS3 compliance and Active product status.

Everlight Alternative (484-10SYGT/S530-E2):

This part is a yellow-green LED (573nm dominant wavelength) with lower brightness (12.5mcd) and wider viewing angle (80°). Forward voltage is 2.0V at 20mA test current. This option is suitable only where yellow-green color is acceptable and lower brightness is tolerable. Height is significantly reduced (4.10mm), providing maximum PCB clearance.

Selection Criteria by Application:

For direct replacement with minimal design impact: SLR-343MCT32
For active product with standard brightness: HLMP-1520 or HLMP-1521
For enhanced brightness and visibility: HLMP-Y802-F0000 or LTL1CHJGTNN
For compact PCB designs: HLMP-Y502-F0000, HLMP-Y802-F0000, or 484-10SYGT/S530-E2
For wide viewing angle applications: LTL-1KHGE or 484-10SYGT/S530-E2

All recommended substitutes are ROHS3 compliant and maintain through-hole radial package compatibility with the original SLR-342MCT32.

Frequently Asked Questions (FAQ)

Q: Can SLR-343MCT32 be used as a direct replacement for SLR-342MCT32?

A: Yes. SLR-343MCT32 is the parametric equivalent with identical electrical specifications (2.1V, 10mA, 25mcd, 40° viewing angle) and mechanical form factor (T-1 radial, 3.10mm lens). The only difference is peak wavelength specification (563nm vs. unspecified), which does not affect functional compatibility. SLR-343MCT32 is Active status, making it the recommended primary substitute.

Q: What is the difference between Broadcom HLMP-1520 and HLMP-1521?

A: HLMP-1520 and HLMP-1521 are electrically and mechanically identical. Both feature 2.1V forward voltage, 10mA test current, 22mcd brightness, 45° viewing angle, and T-1 radial package. The difference is packaging format: HLMP-1520 is supplied in Bulk, while HLMP-1521 is supplied in Bulk. HLMP-1521-E0002 is the Tape & Reel variant of HLMP-1521. Selection depends on procurement and assembly requirements.

Q: Can I use HLMP-Y802-F0000 instead of SLR-342MCT32?

A: Yes, with design consideration. HLMP-Y802-F0000 maintains 2.1V forward voltage and T-1 radial package compatibility. However, it operates at 20mA test current (vs. 10mA) and provides significantly higher brightness (240mcd vs. 25mcd). This increased brightness may be visible in the application. Height is reduced (5.20mm vs. 5.40mm), improving PCB clearance. Circuit current limiting must accommodate 20mA operation.

Q: Is the yellow-green 484-10SYGT/S530-E2 compatible with SLR-342MCT32?

A: 484-10SYGT/S530-E2 is mechanically compatible (through-hole radial, 3.0mm lens) but differs in color (yellow-green vs. green) and brightness (12.5mcd vs. 25mcd). Use this part only if yellow-green color is acceptable and lower brightness is tolerable. Forward voltage is 2.0V at 20mA test current. Height is significantly reduced (4.10mm), providing maximum PCB clearance.

Q: What PCB clearance considerations apply to substitute parts?

A: Original SLR-342MCT32 has maximum height of 5.40mm. Broadcom HLMP series parts are taller (6.35mm), requiring verification of PCB clearance above the component. Lite-On LTL series and Broadcom HLMP-Y series are shorter (5.0mm to 5.20mm), providing improved clearance. Everlight 484-10SYGT/S530-E2 is the most compact (4.10mm). Verify PCB layout and enclosure dimensions before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 Compliant, matching the original SLR-342MCT32 compliance status. All parts are also REACH Unaffected or REACH Compliant, maintaining regulatory compatibility for applications requiring environmental compliance.

Q: What is the difference between 10mA and 20mA test current specifications?

A: Test current indicates the standard operating condition at which brightness (millicandela rating) is measured. Parts specified at 10mA (SLR-342MCT32, SLR-343MCT32, HLMP series) will operate at lower brightness if driven at 20mA, and vice versa. Circuit design must account for actual operating current to ensure proper brightness. Higher test current typically indicates higher brightness capability at standard operating conditions.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all parts meet the electrical and mechanical requirements of the application. However, brightness variations (12.5mcd to 240mcd) may result in inconsistent visual indication across multiple LEDs. For applications requiring uniform brightness, select parts with similar millicandela ratings. Verify forward voltage compatibility with circuit current limiting design.

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