SLR-342MC3F Equivalent & Substitute Parts

Part Overview

The SLR-342MC3F is a green LED indicator from Rohm Semiconductor designed for through-hole applications. This part operates at 2.1V forward voltage with a 25mcd brightness rating and 572nm dominant wavelength. The product is classified as "Not For New Designs," making identification of equivalent alternatives essential for ongoing production support and design updates. Substitute parts must maintain electrical compatibility while meeting current availability and compliance requirements.

Key Parameters

Parameter	Value
Color	Green
Lens Transparency	Clear
Voltage - Forward (Vf) (Typ)	2.1V
Current - Test	10mA
Millicandela Rating	25mcd
Wavelength - Dominant	572nm
Viewing Angle	40°
Mounting Type	Through Hole
Package / Case	Radial
Supplier Device Package	T-1
Height (Max)	5.40mm
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SLR-342MC3F is determined by the following criteria:

Direct Substitutes maintain identical or near-identical electrical and mechanical specifications:

Forward voltage (Vf) within 0.1V tolerance
Wavelength - Dominant within 5nm tolerance
Millicandela rating within 10% tolerance
Identical mounting type (Through Hole) and package style (T-1 Radial)
Matching lens color and transparency

Parametric Equivalents share the same base series or manufacturer with compatible electrical characteristics but may have minor packaging variations.

Similar Parts provide functional equivalence with acceptable deviations in brightness, viewing angle, or wavelength within the green spectrum, suitable for applications where exact specifications are not critical.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Wavelength - Dominant	mcd Rating	Viewing Angle	Height (Max)	Product Status	Packaging
SLR-342MC3F	Rohm Semiconductor	2.1V	572nm	25mcd	40°	5.40mm	Not For New Designs	Bulk
SLR-343MCT32	Rohm Semiconductor	2.1V	563nm	25mcd	40°	5.60mm	Active	Cut Tape (CT)
SLR-343MC3F	Rohm Semiconductor	2.1V	572nm	25mcd	40°	5.60mm	Not For New Designs	Bulk
HLMP-1520	Broadcom Limited	2.1V	569nm	22mcd	45°	6.35mm	Active	Bulk
HLMP-1521	Broadcom Limited	2.1V	569nm	22mcd	45°	6.35mm	Active	Bulk
HLMP-1521-E0002	Broadcom Limited	2.1V	569nm	22mcd	45°	6.35mm	Active	Tape & Reel (TR)
HLMP-Y502-F0000	Broadcom Limited	2.2V	573nm	40mcd	55°	5.20mm	Active	Bulk
HLMP-Y802-F0000	Broadcom Limited	2.1V	572nm	240mcd	45°	5.20mm	Active	Bulk
LTL-1KHGE	Lite-On Inc.	2.1V	569nm	29mcd	75°	5.00mm	Active	Not Specified
LTL1CHJGTNN	Lite-On Inc.	2.05V	572nm	180mcd	45°	5.20mm	Active	Bulk
484-10SYGT/S530-E2	Everlight Electronics Co Ltd	2V	573nm	12.5mcd	80°	4.10mm	Active	Bulk

Engineering Selection Recommendations

For Direct Replacement (Preferred): SLR-343MC3F is the primary equivalent, maintaining identical electrical specifications (2.1V, 572nm, 25mcd) within the same Rohm Semiconductor series. This part is classified as "Not For New Designs" but remains available in inventory (658 pcs). Height variation of 0.2mm is within acceptable mechanical tolerance for standard through-hole applications.

For Active Production (Recommended for New Designs): SLR-343MCT32 provides the most direct active alternative from Rohm Semiconductor with matching electrical parameters. Available in Cut Tape packaging (7696 pcs inventory), this part supports higher-volume production requirements. Wavelength deviation of 9nm (563nm vs. 572nm) remains within the green spectrum and is suitable for general indication applications.

For Broadcom HLMP Series: HLMP-1520 and HLMP-1521 are active alternatives with identical forward voltage (2.1V) and compatible brightness (22mcd). These parts feature slightly wider viewing angles (45° vs. 40°) and greater height (6.35mm). HLMP-1521-E0002 offers the same electrical performance in Tape & Reel packaging for automated assembly.

For High-Brightness Applications: HLMP-Y802-F0000 maintains the exact dominant wavelength (572nm) and forward voltage (2.1V) while providing significantly higher brightness (240mcd). This part is suitable for applications requiring enhanced visibility without circuit redesign.

For Wide-Angle Applications: LTL-1KHGE from Lite-On Inc. provides a 75° viewing angle with compatible electrical specifications (2.1V, 569nm, 29mcd), suitable for applications requiring broader light distribution.

All recommended substitutes are ROHS3 compliant and carry REACH Unaffected status, matching the compliance profile of the original SLR-342MC3F.

Frequently Asked Questions (FAQ)

Q: Can I use HLMP-Y802-F0000 as a direct replacement for SLR-342MC3F? A: HLMP-Y802-F0000 is electrically compatible (2.1V, 572nm wavelength) but provides 240mcd brightness versus the original 25mcd. This part is suitable only if the application can tolerate significantly higher light output. Circuit current-limiting resistors must be verified for the higher brightness rating.

Q: What is the difference between SLR-343MCT32 and SLR-343MC3F? A: Both parts share identical electrical specifications (2.1V, 25mcd, 40° viewing angle). The primary difference is packaging: SLR-343MCT32 is supplied in Cut Tape format for automated assembly, while SLR-343MC3F is supplied in Bulk. SLR-343MCT32 is the active product; SLR-343MC3F is not recommended for new designs.

Q: Are Broadcom HLMP-1520 and HLMP-1521 interchangeable? A: Yes. Both parts have identical electrical and mechanical specifications (2.1V, 569nm, 22mcd, 45° viewing angle, 6.35mm height). HLMP-1521-E0002 is the same part in Tape & Reel packaging. Selection depends on packaging requirements for assembly processes.

Q: Why does 484-10SYGT/S530-E2 have lower brightness (12.5mcd)? A: This Everlight part is classified as Yellow-Green (573nm) rather than pure green, with a lower millicandela rating. It is suitable only for applications where reduced brightness and wider viewing angle (80°) are acceptable trade-offs.

Q: What is the impact of forward voltage differences (2.0V to 2.2V)? A: Forward voltage variations within this range are typical for LED indicators and do not require circuit redesign in standard applications using current-limiting resistors. Verify that the series resistor value accommodates the voltage range for your specific supply voltage.

Q: Can I substitute based on wavelength alone? A: No. Wavelength, brightness (mcd), forward voltage, and viewing angle must all be evaluated together. A part with matching wavelength but significantly different brightness or voltage may not perform as intended in the original application.

Q: Which substitute offers the best availability? A: HLMP-Y802-F0000 (28,111 pcs) and HLMP-Y502-F0000 (24,988 pcs) from Broadcom offer the highest inventory levels. For Rohm Semiconductor alternatives, SLR-343MCT32 provides 7,696 pcs in active status.

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