SLR-37VC3F Equivalent & Substitute Parts

Part Overview

The SLR-37VC3F is a red LED indication component manufactured by Rohm Semiconductor, designed for through-hole mounting applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design requirements and production continuity. The component features a 3mm clear lens with 16mcd brightness rating and operates at 2V forward voltage with 10mA test current.

Key Parameters

Parameter	SLR-37VC3F
Manufacturer	Rohm Semiconductor
Color	Red
Lens Size	3.10mm Dia
Lens Transparency	Clear
Voltage - Forward (Vf) (Typ)	2V
Current - Test	10mA
Millicandela Rating	16mcd
Mounting Type	Through Hole
Wavelength - Peak	650nm
Viewing Angle	50°
Package / Case	Radial
Height (Max)	5.00mm
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the SLR-37VC3F are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Color: Red
Lens Size: 3.10mm Dia
Lens Transparency: Clear
Voltage - Forward (Vf) (Typ): 2V
Mounting Type: Through Hole
Package / Case: Radial
Lens Style: Round with Domed Top

Allowable Variation Parameters:

Millicandela Rating: Substitute parts may exceed the original 16mcd specification
Current - Test: Substitute parts may operate at different test currents (10mA or 20mA)
Viewing Angle: Substitute parts may vary within the range of 40° to 50°
Wavelength - Peak: Substitute parts may vary within the red spectrum (625nm to 650nm)
Height (Max): Substitute parts may vary within 5.00mm to 5.60mm
Product Status: Active substitutes are preferred over obsolete originals

The following parts meet these substitution criteria:

SLR-343VC3F (Rohm Semiconductor) - Same manufacturer, active product status, higher brightness rating LTL-1CHEE (Lite-On Inc.) - Cross-manufacturer substitute, active product status, compatible electrical and mechanical specifications

Parameter Comparison

Parameter	SLR-37VC3F	SLR-343VC3F	LTL-1CHEE
Manufacturer	Rohm Semiconductor	Rohm Semiconductor	Lite-On Inc.
Product Status	Obsolete	Active	Active
Color	Red	Red	Red
Lens Size	3.10mm Dia	3.10mm Dia	3.10mm Dia
Lens Transparency	Clear	Clear	Clear
Voltage - Forward (Vf) (Typ)	2V	2V	2V
Current - Test	10mA	10mA	20mA
Millicandela Rating	16mcd	25mcd	19mcd
Viewing Angle	50°	40°	45°
Mounting Type	Through Hole	Through Hole	Through Hole
Wavelength - Peak	650nm	630nm	635nm
Package / Case	Radial	Radial	Radial
Height (Max)	5.00mm	5.60mm	5.20mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Affected

Engineering Selection Recommendations

SLR-343VC3F is the primary substitute option. It is manufactured by Rohm Semiconductor, the same original manufacturer, and maintains active product status. This part exceeds the original brightness specification at 25mcd compared to 16mcd, operates at identical forward voltage and test current, and maintains ROHS3 compliance and REACH unaffected status. The viewing angle is narrower at 40° versus the original 50°, and maximum height increases to 5.60mm from 5.00mm.

LTL-1CHEE is a secondary cross-manufacturer substitute from Lite-On Inc. with active product status. This part meets all critical electrical and mechanical parameters, including identical 2V forward voltage and 3.10mm lens size. The brightness rating of 19mcd exceeds the original specification. The test current is specified at 20mA compared to the original 10mA. This part carries REACH affected status, which may require additional compliance evaluation depending on application requirements. Maximum height is 5.20mm.

Both substitutes maintain ROHS3 compliance and radial through-hole mounting compatibility with the original SLR-37VC3F.

Frequently Asked Questions (FAQ)

Q: Can SLR-343VC3F be used as a direct replacement for SLR-37VC3F? A: Yes. Both parts share identical forward voltage (2V), test current (10mA), lens size (3.10mm), and mounting type (through-hole radial). The SLR-343VC3F provides higher brightness (25mcd vs 16mcd) and narrower viewing angle (40° vs 50°). Maximum height increases from 5.00mm to 5.60mm.

Q: What is the difference between SLR-343VC3F and LTL-1CHEE? A: Both are active substitutes with identical forward voltage and lens specifications. SLR-343VC3F is from the original manufacturer (Rohm) with REACH unaffected status. LTL-1CHEE is from Lite-On Inc. with REACH affected status and operates at 20mA test current versus 10mA for the SLR-343VC3F.

Q: Are there any height restrictions when substituting these parts? A: The original SLR-37VC3F has a maximum height of 5.00mm. SLR-343VC3F reaches 5.60mm and LTL-1CHEE reaches 5.20mm. Verify that your PCB layout and mechanical assembly accommodate these height variations.

Q: Do all substitute parts meet RoHS compliance? A: Yes. SLR-37VC3F, SLR-343VC3F, and LTL-1CHEE are all ROHS3 compliant. However, LTL-1CHEE carries REACH affected status, while the original and SLR-343VC3F are REACH unaffected.

Q: What is the impact of different test currents on brightness? A: The original SLR-37VC3F and SLR-343VC3F are specified at 10mA test current. LTL-1CHEE is specified at 20mA test current. Brightness ratings are measured at their respective test currents. Actual brightness at operating current must be evaluated based on the LED's current-brightness characteristic curve.

Q: Can these parts be used interchangeably in existing designs? A: Electrical interchangeability is confirmed for all three parts at 2V forward voltage. Mechanical interchangeability requires verification of PCB hole spacing, lead diameter compatibility, and available height clearance. The viewing angle differences (40° to 50°) may affect optical performance in specific applications.

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