SLR-342YC3F Yellow LED T-1 Through Hole Equivalent & Substitute Parts

Part Overview

The SLR-342YC3F is a yellow 587nm LED indication component manufactured by Rohm Semiconductor in T-1 through-hole radial package configuration. This part operates at 2.1V forward voltage with 16mcd luminous intensity and 40° viewing angle. The component is marked as Not For New Designs, making identification of equivalent and substitute parts essential for ongoing production support, maintenance applications, and design transitions.

Key Parameters

Parameter	Value
Manufacturer Part Number	SLR-342YC3F
Manufacturer	Rohm Semiconductor
Color	Yellow
Wavelength - Dominant	587nm
Voltage - Forward (Vf) Typical	2.1V
Current - Test	10mA
Millicandela Rating	16mcd
Viewing Angle	40°
Lens Style	Round with Domed Top
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
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution of the SLR-342YC3F is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

Color: Yellow (587nm wavelength range acceptable between 585nm–588nm)
Voltage - Forward (Vf): 2.0V–2.1V typical
Current - Test: 10mA–20mA operational range
Mounting Type: Through Hole radial configuration
Package / Case: Radial T-1 form factor
Lens Style: Round with Domed Top
Lens Size: 3.0mm–3.10mm diameter
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Acceptable Variation Ranges:

Millicandela Rating: 15mcd–180mcd (brightness variation acceptable for indication applications)
Viewing Angle: 30°–50° (application-dependent)
Height: 4.60mm–6.35mm (mechanical fit dependent on PCB clearance)

Substitute parts are classified as Direct (identical electrical characteristics, different packaging or series), Similar (matching color, wavelength, and form factor with minor parameter variations), or Compatible (same functional category with acceptable electrical tolerance).

Parameter Comparison

Part Number	Manufacturer	Color	Wavelength (nm)	Vf (V)	Current (mA)	mcd	Viewing Angle	Height (mm)	Product Status	Packaging
SLR-342YC3F	Rohm Semiconductor	Yellow	587	2.1	10	16	40°	5.40	Not For New Designs	Bulk
SLR-343YC3F	Rohm Semiconductor	Yellow	585	2.1	10	16	40°	5.60	Not For New Designs	Bulk
HLMP-1420	Broadcom Limited	Yellow	585	2.0	10	15	45°	6.35	Active	Bulk
HLMP-1421	Broadcom Limited	Yellow	585	2.0	10	15	45°	6.35	Active	Bulk
HLMP-1421-F0002	Broadcom Limited	Yellow	585	2.0	10	15	45°	6.35	Active	Tape & Reel
LTL1CHJSTNN	Lite-On Inc.	Yellow	587	2.05	20	180	45°	5.20	Active	Bulk
SSL-LX3044YT	Lumex Opto/Components Inc.	Yellow	585	2.1	20	90	30°	4.60	Active	Bulk
SSL-LX3054YT	Lumex Opto/Components Inc.	Yellow	585	2.1	20	90	30°	5.25	Active	Bulk

Engineering Selection Recommendations

Direct Substitution (Rohm Semiconductor Series): SLR-343YC3F is the primary direct substitute within the Rohm Semiconductor product line. Both parts share identical electrical specifications (2.1V, 10mA test current, 16mcd, 40° viewing angle) and yellow 585nm–587nm wavelength range. Height difference of 0.20mm (5.60mm vs 5.40mm) is negligible for through-hole applications. Both parts carry Not For New Designs status, indicating end-of-life trajectory. SLR-343YC3F maintains ROHS3 compliance and MSL-1 rating.

Active Product Alternatives (Recommended for New Designs): HLMP-1420 and HLMP-1421 (Broadcom Limited) are Active status products offering superior long-term availability. Both operate at 2.0V forward voltage (0.1V lower than SLR-342YC3F) with matching 10mA test current and 15mcd brightness. Wavelength specification of 585nm aligns with SLR-342YC3F dominant wavelength. Viewing angle increases to 45° and height to 6.35mm. HLMP-1421-F0002 provides identical electrical performance in Tape & Reel packaging for automated assembly.

High-Brightness Alternative: LTL1CHJSTNN (Lite-On Inc.) matches dominant wavelength (587nm) and forward voltage (2.05V) with significantly elevated brightness (180mcd vs 16mcd). Test current increases to 20mA. Active product status ensures availability. Suitable for applications requiring enhanced luminous intensity within the same form factor.

Lumex Opto/Components Alternatives: SSL-LX3044YT and SSL-LX3054YT provide 2.1V forward voltage matching and 585nm wavelength specification. Both deliver 90mcd brightness at 20mA test current. SSL-LX3044YT height of 4.60mm offers compact profile; SSL-LX3054YT at 5.25mm provides closer mechanical match to SLR-342YC3F. Both maintain Active product status and ROHS3 compliance.

Compliance Verification: All substitute parts listed maintain ROHS3 compliance and MSL-1 (Unlimited) moisture sensitivity rating, matching SLR-342YC3F environmental specifications. REACH Unaffected status is consistent across all alternatives. EAR99 export classification applies uniformly.

Frequently Asked Questions (FAQ)

Q: Can SLR-343YC3F directly replace SLR-342YC3F without circuit modification? A: Yes. SLR-343YC3F is electrically identical (2.1V, 10mA, 16mcd, 40° viewing angle) with wavelength within acceptable yellow LED range (585nm vs 587nm). Height difference of 0.20mm does not affect through-hole mounting. No circuit changes required.

Q: Why are Broadcom HLMP-1420 and HLMP-1421 recommended over Rohm alternatives? A: Both Broadcom parts carry Active product status, ensuring long-term availability and supply continuity. Rohm SLR-342YC3F and SLR-343YC3F are marked Not For New Designs, indicating end-of-life status. Broadcom parts operate at 2.0V (within acceptable tolerance) with matching 10mA test current and 15mcd brightness specification.

Q: What is the impact of forward voltage difference between 2.0V and 2.1V? A: Forward voltage tolerance of ±0.1V is standard in LED indication applications. Series resistor values in typical circuits accommodate this variation. Verify circuit design operates within 2.0V–2.1V range; most indicator circuits are designed for this tolerance band.

Q: Can LTL1CHJSTNN be used as a drop-in replacement? A: LTL1CHJSTNN is mechanically compatible (T-1 through-hole radial) and electrically similar (2.05V, 587nm wavelength). However, brightness increases from 16mcd to 180mcd and test current from 10mA to 20mA. Verify circuit design accommodates higher brightness and current draw. Suitable for applications requiring enhanced visibility.

Q: What packaging options are available for automated assembly? A: HLMP-1421-F0002 is supplied in Tape & Reel (TR) packaging for automated pick-and-place assembly. All other alternatives listed are available in Bulk or standard packaging. Confirm packaging availability with supplier for production volume requirements.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL-1 (Unlimited) moisture sensitivity rating, matching SLR-342YC3F environmental specifications. REACH Unaffected status applies uniformly across all alternatives.

Q: What is the viewing angle impact when substituting with HLMP-1420 or HLMP-1421? A: Viewing angle increases from 40° to 45°, providing slightly wider light distribution. This is beneficial for general indication applications and does not negatively impact performance. Verify application does not require narrower beam angle specification.

Q: Can SSL-LX3044YT and SSL-LX3054YT be used interchangeably? A: Both parts are electrically identical (2.1V, 20mA, 90mcd, 585nm wavelength, 30° viewing angle). Primary difference is height: SSL-LX3044YT at 4.60mm (compact) and SSL-LX3054YT at 5.25mm (closer to SLR-342YC3F 5.40mm). Selection depends on PCB clearance requirements. Both are Active status products.

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