SLR-343VRT32 Equivalent & Substitute Parts

Part Overview

The SLR-343VRT32 is a red diffused LED indicator manufactured by Rohm Semiconductor, designed for through-hole mounting applications. This T-1 package LED operates at 2V forward voltage with a 16mcd brightness rating and 40° viewing angle. The part is classified as "Not For New Designs," making identification of functionally equivalent alternatives essential for ongoing production support and design flexibility.

Key Parameters

Parameter	SLR-343VRT32
Manufacturer	Rohm Semiconductor
Color	Red
Lens Transparency	Diffused
Lens Style	Round with Domed Top
Lens Size	3.10mm Dia
Voltage - Forward (Vf) Typ	2V
Current - Test	10mA
Millicandela Rating	16mcd
Viewing Angle	40°
Wavelength - Peak	650nm
Mounting Type	Through Hole
Package / Case	Radial
Supplier Device Package	T-1
Height (Max)	5.60mm
RoHS Status	ROHS3 Compliant
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution compatibility for the SLR-343VRT32 is determined by the following critical parameters:

Color & Wavelength: Red LEDs with peak wavelength in the 625–650nm range
Lens Configuration: Diffused lens with round domed top geometry
Mounting: Through-hole radial package, T-1 form factor
Electrical Characteristics: Forward voltage (Vf) tolerance of 1.7V–2.2V and test current of 10–20mA
Brightness & Viewing Angle: Millicandela rating and viewing angle within acceptable operational ranges
Compliance: ROHS3 compliance and MSL rating of 1 (Unlimited)

The substitute parts listed below meet these criteria and are suitable for direct replacement in applications where the SLR-343VRT32 is no longer available.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Current - Test	mcd	Viewing Angle	Wavelength - Peak	Lens Size	Height (Max)	Product Status	RoHS Status
SLR-343VRT32	Rohm Semiconductor	2V	10mA	16mcd	40°	650nm	3.10mm	5.60mm	Not For New Designs	ROHS3
1254-10SURD/S530-A3	Everlight Electronics Co Ltd	2V	20mA	400mcd	30°	632nm	3.00mm	5.30mm	Active	Not specified
151031SS06000	Würth Elektronik	2.2V	20mA	35mcd	60°	650nm	3.00mm	5.55mm	Active	ROHS3
3HD-F	Bivar Inc.	2V	20mA	30mcd	35°	625nm	3mm, T-1	5.30mm	Active	ROHS3
3RD-F	Bivar Inc.	2.1V	20mA	2mcd	35°	700nm	3mm, T-1	5.30mm	Active	ROHS3
3SRD-F	Bivar Inc.	1.7V	20mA	40mcd	35°	645nm	3mm, T-1	5.30mm	Active	ROHS3
HLMP-1301-G00FG	Broadcom Limited	1.9V	10mA	8.6mcd	60°	635nm	3mm, T-1	6.35mm	Active	ROHS3
HLMP-1600	Broadcom Limited	5V	10mA	2.1mcd	60°	635nm	3mm, T-1	6.35mm	Active	ROHS3
HLMP-1600-D00A1	Broadcom Limited	5V	10mA	2.1mcd	60°	635nm	3mm, T-1	Not specified	Active	ROHS3
HLMP-1600-D00A2	Broadcom Limited	5V	10mA	2.1mcd	60°	635nm	3mm, T-1	Not specified	Active	ROHS3
HLMP-1601	Broadcom Limited	12V	13mA	2.1mcd	60°	635nm	3mm, T-1	6.35mm	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Closest Electrical Match)

The 3HD-F and 3SRD-F from Bivar Inc. provide the closest electrical compatibility with the SLR-343VRT32. Both are active products with ROHS3 compliance, T-1 package configuration, and forward voltages within 0.1V of the original part. The 3HD-F operates at 2V with 30mcd brightness, while the 3SRD-F operates at 1.7V with 40mcd brightness, offering flexibility for different circuit designs.

Secondary Substitutes (Voltage Variation)

The 151031SS06000 from Würth Elektronik is an active ROHS3-compliant alternative with a 2.2V forward voltage and 35mcd brightness. This part accommodates circuits with slightly higher voltage tolerance and provides a 60° viewing angle compared to the original 40°.

Alternative Substitutes (Voltage Dependent)

The HLMP-1301-G00FG from Broadcom Limited operates at 1.9V with 8.6mcd brightness and is suitable for applications where lower brightness is acceptable. The HLMP-1600 and HLMP-1601 series operate at 5V and 12V respectively and are intended for circuits with higher supply voltages; these are not direct substitutes for 2V applications without circuit modification.

All recommended substitutes maintain ROHS3 compliance and MSL rating of 1 (Unlimited), ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can I use HLMP-1600 as a direct replacement for SLR-343VRT32?

A: No. The HLMP-1600 operates at 5V forward voltage, while the SLR-343VRT32 operates at 2V. Direct substitution would require circuit redesign. Use 3HD-F or 3SRD-F for 2V applications.

Q: What is the difference between 3HD-F and 3SRD-F?

A: Both are Bivar Inc. T-1 red diffused LEDs with active product status. The 3HD-F operates at 2V with 30mcd brightness, while the 3SRD-F operates at 1.7V with 40mcd brightness. Select based on your circuit voltage and brightness requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Most substitutes listed are ROHS3 compliant. The 1254-10SURD/S530-A3 from Everlight does not specify RoHS status in the provided data. Verify compliance requirements with your procurement team before selection.

Q: Does lens size variation affect mechanical fit?

A: The SLR-343VRT32 has a 3.10mm lens diameter. Most substitutes use 3.00mm or 3mm T-1 packages, which are mechanically compatible with standard through-hole PCB layouts. Height variations (5.30mm to 6.35mm) are within typical tolerance for indicator applications.

Q: Which substitute offers the closest brightness match?

A: The 3SRD-F from Bivar Inc. provides 40mcd brightness, closest to the original 16mcd rating. The 151031SS06000 from Würth Elektronik offers 35mcd. Both are suitable for applications requiring comparable light output.

Q: Can I interchange parts with different viewing angles?

A: Viewing angle selection depends on application requirements. The SLR-343VRT32 has a 40° viewing angle. Substitutes range from 30° to 60°. Wider angles (60°) provide visibility from more directions; narrower angles (30°) concentrate light output. Select based on your specific application geometry.

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