SLR-343PCT32 Equivalent & Substitute Parts

Part Overview

The SLR-343PCT32 is a green 560nm LED indication component manufactured by Rohm Semiconductor, designed for through-hole mounting applications. This part operates at 2.1V forward voltage with a 10mA test current and delivers 6.3mcd luminous intensity through a clear, domed lens. The component is classified as Last Time Buy, indicating production discontinuation. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Key Parameters

Parameter	SLR-343PCT32 Value
Color	Green
Wavelength - Dominant	560nm
Voltage - Forward (Vf) Typical	2.1V
Current - Test	10mA
Millicandela Rating	6.3mcd
Lens Style	Round with Domed Top
Lens Size	3.10mm Dia
Viewing Angle	40°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	5.60mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SLR-343PCT32 is determined by the following critical parameters:

Color: Green wavelength range (560nm–575nm dominant wavelength acceptable)
Voltage - Forward (Vf): 2.0V–2.1V typical operating range
Mounting Type: Through Hole radial configuration
Lens Style: Round with domed top
Lens Size: 3.0mm–3.1mm diameter
Package / Case: Radial through-hole package
RoHS Compliance: ROHS3 compliant preferred
Moisture Sensitivity: MSL 1 or equivalent

Substitute parts are grouped into two categories:

Category 1: Direct Manufacturer Equivalent

RLI-343P8CT32 (Rohm Semiconductor) – Same manufacturer, oval lens variant

Category 2: Cross-Manufacturer Green LED Substitutes (560nm–575nm)

LTL-4236N, HLMP-Y801-JPP00, 3SUGC-F, 3GC-201-S, MV7442 (Lite-On, Broadcom, Bivar, Fairchild)

Category 3: Yellow-Green LED Alternatives (573nm)

1224SYGC/S530-E2, 264-7SYGC/S530-E2 (Everlight Electronics) – Different color, higher brightness

Parameter Comparison

Part Number	Manufacturer	Color	Wavelength (nm)	Vf (Typ)	Test Current	mcd	Lens Size (mm)	Viewing Angle	Height Max (mm)	Product Status
SLR-343PCT32	Rohm Semiconductor	Green	560	2.1V	10mA	6.3	3.10	40°	5.60	Last Time Buy
RLI-343P8CT32	Rohm Semiconductor	–	–	–	–	–	–	–	–	Active
LTL-4236N	Lite-On Inc.	Green	569	2.1V	10mA	40	3.00	45°	5.85	Active
HLMP-Y801-JPP00	Broadcom Limited	Green	568	2.1V	20mA	310	3.00	30°	5.20	Active
3SUGC-F	Bivar Inc.	Green	–	2.1V	20mA	300	3.00	20°	5.30	Active
3GC-201-S	Bivar Inc.	Green	–	2.1V	20mA	40	3.00	20°	6.58	Active
MV7442	Fairchild Semiconductor	Green	570	2.1V	20mA	120	3.00	45°	6.30	Active
LTL1CHKGKNN	Lite-On Inc.	Green	572	2.05V	20mA	320	3.00	45°	5.20	Active
1224SYGC/S530-E2	Everlight Electronics	Yellow-Green	573	2.0V	20mA	100	3.00	25°	5.50	Active
264-7SYGC/S530-E2	Everlight Electronics	Yellow-Green	573	2.0V	20mA	100	2.90	40°	6.30	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended)

LTL-4236N and HLMP-Y801-JPP00 are the preferred substitutes. Both maintain green wavelength (568–569nm), 2.1V forward voltage, and through-hole radial mounting. LTL-4236N operates at the original 10mA test current, while HLMP-Y801-JPP00 requires 20mA but delivers significantly higher brightness (310mcd). Both manufacturers maintain active product status and ROHS3 compliance.

Secondary Substitutes (Conditional)

3SUGC-F and MV7442 are suitable alternatives with active product status and ROHS3 compliance. Both operate at 2.1V and green wavelength. MV7442 offers higher brightness (120mcd) and wider viewing angle (45°) but requires 20mA test current. 3SUGC-F delivers 300mcd brightness at 20mA test current.

Alternative Consideration

LTL1CHKGKNN (Lite-On) provides 320mcd brightness with 45° viewing angle and active status. Forward voltage is 2.05V, within acceptable tolerance. REACH compliance differs from the original part.

Yellow-Green Alternatives (Design Verification Required)

1224SYGC/S530-E2 and 264-7SYGC/S530-E2 (Everlight) operate at 573nm wavelength (yellow-green) with 2.0V forward voltage. These are suitable only if application design permits color shift from green to yellow-green. Both are active products with ROHS3 compliance.

Avoid

RLI-343P8CT32 lacks sufficient parameter documentation for direct substitution assessment.

Frequently Asked Questions (FAQ)

Q: Can LTL-4236N directly replace SLR-343PCT32 without circuit modification?

A: Yes. LTL-4236N matches the critical parameters: green wavelength (569nm), 2.1V forward voltage, 10mA test current, and through-hole radial mounting. Height (5.85mm) and lens diameter (3.00mm) are within acceptable tolerance of the original 5.60mm and 3.10mm specifications.

Q: Why do some substitutes require 20mA instead of 10mA?

A: Test current specification indicates the current at which luminous intensity is measured. Higher test current (20mA) typically correlates with higher brightness output. Circuit design must accommodate the increased current requirement. Verify power supply and current-limiting resistor sizing before substitution.

Q: Are yellow-green LEDs (573nm) acceptable substitutes?

A: Yellow-green substitutes (1224SYGC/S530-E2, 264-7SYGC/S530-E2) are electrically compatible but produce visually different color output. Substitution is acceptable only if application design permits color shift or if color indication is not critical to function. Verify with design requirements before implementation.

Q: What is the difference between lens diameter specifications (3.00mm vs. 3.10mm)?

A: Both dimensions fall within standard T-1 (3mm) LED package classification. The 0.10mm difference is within manufacturing tolerance and does not affect mechanical fit in standard through-hole PCB layouts. Verify PCB pad spacing accommodates radial lead configuration.

Q: Which substitute offers the best brightness match to the original?

A: SLR-343PCT32 delivers 6.3mcd at 10mA. LTL-4236N matches this at 10mA test current (40mcd at 20mA). For higher brightness requirements, HLMP-Y801-JPP00 (310mcd), 3SUGC-F (300mcd), and LTL1CHKGKNN (320mcd) are available, though these require 20mA test current and circuit redesign.

Q: Are all substitutes ROHS3 compliant?

A: All recommended substitutes (LTL-4236N, HLMP-Y801-JPP00, 3SUGC-F, 3GC-201-S, MV7442, LTL1CHKGKNN) are ROHS3 compliant. Yellow-green alternatives (1224SYGC/S530-E2, 264-7SYGC/S530-E2) are also ROHS3 compliant.

Q: What is the impact of viewing angle differences (40° vs. 20°–45°)?

A: Viewing angle determines the cone of light emission. SLR-343PCT32 has 40° viewing angle. Substitutes with narrower angles (20°) concentrate light intensity in a tighter cone, suitable for direct viewing applications. Wider angles (45°) distribute light over a broader area. Select based on application visibility requirements.

Q: Can MV7442 be used as a drop-in replacement?

A: MV7442 is mechanically compatible (3mm T-1 package, through-hole radial) and electrically compatible (2.1V, green 570nm). However, it requires 20mA test current versus the original 10mA, and height is 6.30mm versus 5.60mm. Circuit redesign for current handling is necessary. Verify PCB clearance for increased height.

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