SLR-342VRT32 Equivalent & Substitute Parts

Part Overview

The SLR-342VRT32 is a red diffused T-1 through-hole LED manufactured by Rohm Semiconductor, designed for discrete indication applications. Specified at 2V forward voltage with 16mcd brightness and a 630nm dominant wavelength, this component operates at 10mA test current with a 40° viewing angle. The part carries a "Not For New Designs" status, making identification of equivalent and substitute components essential for ongoing production support, design updates, and inventory management.

Key Parameters

Parameter	Value
Manufacturer Part Number	SLR-342VRT32
Manufacturer	Rohm Semiconductor
Color	Red
Lens Transparency	Diffused
Voltage - Forward (Vf) (Typ)	2V
Current - Test	10mA
Millicandela Rating	16mcd
Wavelength - Dominant	630nm
Viewing Angle	40°
Mounting Type	Through Hole
Lens Size	3.10mm Dia
Height (Max)	5.40mm
Package / Case	Radial
Supplier Device Package	T-1
RoHS Status	ROHS3 Compliant
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution eligibility for the SLR-342VRT32 is determined by the following critical parameters:

Primary Compatibility Criteria:

Color: Red
Lens Transparency: Diffused
Mounting Type: Through Hole
Package / Case: Radial
Voltage - Forward (Vf): 2V ± 0.3V tolerance range
Current - Test: 10mA to 20mA operational range

Secondary Compatibility Criteria:

Millicandela Rating: 16mcd minimum (brightness equivalence)
Wavelength - Dominant: 620nm to 640nm range (red spectrum)
Viewing Angle: 30° to 60° (acceptable for indication applications)
Lens Size: 3.00mm to 3.10mm diameter
Height (Max): 5.30mm to 5.60mm (PCB clearance compatibility)

Substitute parts are grouped into two categories: Parametric Equivalents (matching all primary criteria with minimal deviation) and Similar Parts (meeting primary criteria with acceptable secondary parameter variations for functional substitution).

Parameter Comparison

Parameter	SLR-342VRT32	SLR-343VRT32	1254-10SURD/S530-A3	151031SS06000	3HD-F	3RD-F	3SRD-F	HLMP-1301-G00FG
Manufacturer	Rohm Semiconductor	Rohm Semiconductor	Everlight Electronics	Würth Elektronik	Bivar Inc.	Bivar Inc.	Bivar Inc.	Broadcom Limited
Color	Red	Red	Red	Red	Red	Red	Red	Red
Lens Transparency	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused
Voltage - Forward (Vf) (Typ)	2V	2V	2V	2.2V	2V	2.1V	1.7V	1.9V
Current - Test	10mA	10mA	20mA	20mA	20mA	20mA	20mA	10mA
Millicandela Rating	16mcd	16mcd	400mcd	35mcd	30mcd	2mcd	40mcd	8.6mcd
Wavelength - Dominant	630nm	—	624nm	640nm	—	—	—	626nm
Wavelength - Peak	—	650nm	632nm	650nm	625nm	700nm	645nm	635nm
Viewing Angle	40°	40°	30°	60°	35°	35°	35°	60°
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Lens Size	3.10mm Dia	3.10mm Dia	3.00mm Dia	3.00mm Dia	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1
Height (Max)	5.40mm	5.60mm	5.30mm	5.55mm	5.30mm	5.30mm	5.30mm	6.35mm
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial
Supplier Device Package	T-1	T-1	3mm	3mm Round	T-1	T-1	T-1	T-1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Not For New Designs	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Parametric Equivalent (Recommended Primary Substitute):

SLR-343VRT32 (Rohm Semiconductor) is the direct parametric equivalent, matching the SLR-342VRT32 across all primary electrical and mechanical parameters. Both components share identical forward voltage (2V), test current (10mA), millicandela rating (16mcd), viewing angle (40°), and T-1 radial package configuration. The SLR-343VRT32 differs only in wavelength specification (650nm peak vs. 630nm dominant) and packaging format (Cut Tape vs. standard), representing negligible functional deviation. Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings. The SLR-343VRT32 carries higher inventory availability (4377 pcs vs. 886 pcs), supporting production continuity.

Active Product Alternatives (For New Designs):

For applications requiring active product status, the following substitutes meet primary compatibility criteria:

1254-10SURD/S530-A3 (Everlight Electronics) maintains 2V forward voltage and diffused red lens configuration. This part operates at 20mA test current (vs. 10mA) and delivers significantly higher brightness (400mcd vs. 16mcd), suitable for applications requiring enhanced visibility. Wavelength specification (624nm dominant, 632nm peak) aligns with red spectrum requirements. Lens size (3.00mm) and height (5.30mm) remain within acceptable mechanical tolerances.

151031SS06000 (Würth Elektronik) provides 2.2V forward voltage operation with 35mcd brightness and 60° viewing angle, offering wider light distribution than the original specification. The 640nm dominant wavelength maintains red spectrum compliance. This part accommodates 20mA test current and features ROHS3 compliance with higher inventory availability (10009 pcs).

3SRD-F (Bivar Inc.) operates at reduced forward voltage (1.7V) with 40mcd brightness and 35° viewing angle. This configuration supports lower-power circuit designs while maintaining diffused red lens characteristics and T-1 package compatibility. ROHS3 compliance and active product status support long-term availability.

HLMP-1301-G00FG (Broadcom Limited) delivers 1.9V forward voltage operation at 10mA test current, matching the original current specification. The 8.6mcd brightness and 60° viewing angle provide alternative optical characteristics within acceptable parameters. ROHS3 compliance and active status ensure design continuity.

All recommended substitutes maintain through-hole radial mounting, diffused red lens transparency, and compliance certifications equivalent to the original SLR-342VRT32.

Frequently Asked Questions (FAQ)

Q: Can SLR-343VRT32 directly replace SLR-342VRT32 in existing designs?

A: Yes. SLR-343VRT32 is a parametric equivalent with identical electrical performance (2V forward voltage, 10mA test current, 16mcd brightness) and mechanical compatibility (T-1 radial package, 3.10mm lens diameter, 5.60mm maximum height). The wavelength specification difference (650nm peak vs. 630nm dominant) does not affect functional substitution in indication applications. Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings.

Q: Why do substitute parts show different test current ratings (10mA vs. 20mA)?

A: Test current specification indicates the operational current at which brightness and wavelength characteristics are measured. Parts rated at 20mA test current deliver higher brightness output at that current level. For direct substitution in circuits designed for 10mA operation, select parts with matching 10mA test current (SLR-343VRT32, HLMP-1301-G00FG) to maintain equivalent brightness. Parts rated at 20mA can operate at 10mA with proportionally reduced brightness output.

Q: What is the significance of "Not For New Designs" status?

A: This designation indicates the SLR-342VRT32 is in mature/obsolescence phase and not recommended for new product development. Rohm Semiconductor continues supporting existing production but does not recommend this part for new designs. For new applications, select active-status alternatives such as 1254-10SURD/S530-A3, 151031SS06000, 3SRD-F, or HLMP-1301-G00FG to ensure long-term availability and manufacturer support.

Q: How do brightness differences (millicandela ratings) affect substitution?

A: Millicandela rating determines light intensity output. The SLR-342VRT32 specifies 16mcd at 10mA. Substitutes with higher ratings (1254-10SURD/S530-A3 at 400mcd, 3SRD-F at 40mcd, 151031SS06000 at 35mcd) deliver brighter indication. Lower-rated substitutes (HLMP-1301-G00FG at 8.6mcd, 3RD-F at 2mcd) produce dimmer output. Select brightness-matched alternatives for applications with specific visibility requirements, or account for brightness differences in circuit design (resistor value adjustment).

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes carry ROHS3 compliance certification, matching the original SLR-342VRT32. This ensures equivalent environmental and regulatory compliance for production and end-use applications. Compliance status is maintained across all active-status alternatives listed.

Q: What packaging format differences exist among substitutes?

A: The SLR-342VRT32 is supplied in standard packaging. SLR-343VRT32 is available in Cut Tape (CT) format. 1254-10SURD/S530-A3 is supplied in Tape & Reel (TR). Würth Elektronik 151031SS06000 and Bivar parts (3HD-F, 3RD-F, 3SRD-F) are supplied in Bulk. Broadcom HLMP-1301-G00FG is supplied in Bulk. Packaging format does not affect component functionality but influences procurement quantity requirements and handling procedures. Select packaging format based on production volume and inventory management requirements.

Q: Can parts with different viewing angles be substituted?

A: Viewing angle determines the light distribution cone. The SLR-342VRT32 specifies 40°. Substitutes range from 30° (1254-10SURD/S530-A3, narrower distribution) to 60° (151031SS06000, HLMP-1301-G00FG, wider distribution). Narrower angles concentrate light intensity; wider angles distribute light across a broader area. Select viewing angle based on application requirements. For direct optical equivalence, prioritize 35° to 40° alternatives (3HD-F, 3RD-F, 3SRD-F).

Q: What forward voltage tolerance should be considered for substitution?

A: The SLR-342VRT32 specifies 2V typical forward voltage. Acceptable substitutes range from 1.7V to 2.2V, representing ±0.3V tolerance. This variation affects circuit current-limiting resistor calculations. Parts at 1.7V (3SRD-F) require lower series resistance; parts at 2.2V (151031SS06000) require higher resistance. Verify circuit design accommodates forward voltage variation, or recalculate resistor values for substitutes outside the ±0.1V range.

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