SLR-342VR3F Equivalent & Substitute Parts

Part Overview

The SLR-342VR3F is a red diffused T-1 through-hole LED manufactured by Rohm Semiconductor, designed for discrete indication applications. This part operates at 2V forward voltage with a 16mcd brightness rating and 630nm dominant wavelength. The product is classified as "Not For New Designs," making identification of equivalent alternatives essential for ongoing production support and design flexibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	SLR-342VR3F
Manufacturer	Rohm Semiconductor
Color	Red
Lens Transparency	Diffused
Lens Size	3.10mm Dia
Voltage - Forward (Vf) (Typ)	2V
Current - Test	10mA
Millicandela Rating	16mcd
Wavelength - Dominant	630nm
Viewing Angle	40°
Mounting Type	Through Hole
Package / Case	Radial
Supplier Device Package	T-1
Height (Max)	5.40mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SLR-342VR3F is determined by the following critical parameters:

Color: Red (all substitutes must be red)
Lens Transparency: Diffused (optical characteristic must match)
Mounting Type: Through Hole (mechanical compatibility)
Package / Case: Radial (physical form factor)
Voltage - Forward (Vf): 2V nominal (circuit compatibility)
Lens Size: 3.0mm to 3.10mm Dia (mechanical fit)
Wavelength - Dominant: 624nm to 640nm (red spectrum range)

Substitutes are classified into two categories:

Parametric Equivalent: SLR-343VR3F matches all critical electrical and mechanical parameters with identical forward voltage, current rating, and wavelength specification. Product status is Active, providing long-term availability.

Similar Substitutes: Parts from Everlight Electronics, Würth Elektronik, Bivar Inc., and Broadcom Limited meet the core functional requirements (red diffused T-1 through-hole LED) but vary in brightness rating, viewing angle, or test current. These parts are suitable where circuit design accommodates parameter variations within acceptable tolerances.

Parameter Comparison

Parameter	SLR-342VR3F	SLR-343VR3F	1254-10SURD/S530-A3	151031SS06000	3HD-F	3RD-F	3SRD-F	HLMP-1301-G00FG	HLMP-1600
Manufacturer	Rohm Semiconductor	Rohm Semiconductor	Everlight Electronics	Würth Elektronik	Bivar Inc.	Bivar Inc.	Bivar Inc.	Broadcom Limited	Broadcom Limited
Color	Red	Red	Red	Red	Red	Red	Red	Red	Red
Lens Transparency	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused
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	3mm, T-1
Voltage - Forward (Vf) (Typ)	2V	2V	2V	2.2V	2V	2.1V	1.7V	1.9V	5V
Current - Test	10mA	10mA	20mA	20mA	20mA	20mA	20mA	10mA	10mA
Millicandela Rating	16mcd	16mcd	400mcd	35mcd	30mcd	2mcd	40mcd	8.6mcd	2.1mcd
Wavelength - Dominant	630nm	630nm	624nm	640nm	—	—	—	626nm	626nm
Viewing Angle	40°	40°	30°	60°	35°	35°	35°	60°	60°
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	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	T-1
Height (Max)	5.40mm	5.60mm	5.30mm	5.55mm	5.30mm	5.30mm	5.30mm	6.35mm	6.35mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: SLR-343VR3F

The SLR-343VR3F is the direct parametric equivalent, manufactured by Rohm Semiconductor with Active product status. This part maintains identical electrical specifications (2V forward voltage, 10mA test current, 16mcd brightness) and mechanical form factor (T-1 radial package, 3.10mm lens diameter). Both parts are ROHS3 compliant with MSL 1 rating. The SLR-343VR3F provides the highest confidence for direct substitution in existing designs.

Secondary Recommendations for Design Flexibility

Parts from Everlight Electronics (1254-10SURD/S530-A3), Würth Elektronik (151031SS06000), Bivar Inc. (3HD-F, 3RD-F, 3SRD-F), and Broadcom Limited (HLMP-1301-G00FG, HLMP-1600) are suitable alternatives where circuit design accommodates parameter variations. All substitute parts are ROHS3 compliant and rated MSL 1.

Circuit Design Considerations

1254-10SURD/S530-A3: Higher brightness (400mcd) and increased test current (20mA) require circuit current-limiting adjustment. Narrower viewing angle (30°) affects visibility profile.
151031SS06000: Slightly elevated forward voltage (2.2V) and increased test current (20mA) require circuit verification. Wider viewing angle (60°) and higher brightness (35mcd) suitable for applications requiring enhanced visibility.
3HD-F, 3RD-F, 3SRD-F: Increased test current (20mA) requires circuit redesign. Forward voltage ranges from 1.7V to 2.1V. Brightness varies from 2mcd to 40mcd. Suitable for applications with flexible brightness requirements.
HLMP-1301-G00FG: Lower brightness (8.6mcd) and increased height (6.35mm) may affect mechanical fit. Wider viewing angle (60°) and lower test current (10mA) reduce power consumption.
HLMP-1600: High forward voltage (5V) requires dedicated circuit design. Significantly reduced brightness (2.1mcd) limits visibility. Suitable only for applications with 5V supply and low-brightness requirements.

Frequently Asked Questions (FAQ)

Q: Can SLR-343VR3F directly replace SLR-342VR3F without circuit modification?

A: Yes. The SLR-343VR3F is a parametric equivalent with identical forward voltage (2V), test current (10mA), brightness (16mcd), and mechanical form factor (T-1 radial, 3.10mm lens). No circuit modification is required.

Q: What is the primary difference between the main part and substitute parts?

A: The SLR-342VR3F is classified as "Not For New Designs" with limited long-term availability. The SLR-343VR3F and alternative parts from other manufacturers provide Active product status and sustained supply. Substitute parts vary in brightness, viewing angle, and test current specifications.

Q: Which substitute parts require circuit redesign?

A: Parts with test current of 20mA (1254-10SURD/S530-A3, 151031SS06000, 3HD-F, 3RD-F, 3SRD-F) require current-limiting circuit adjustment. HLMP-1600 requires dedicated 5V supply design. All other substitutes operate at 10mA test current compatible with the original design.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant. The main part SLR-342VR3F is also ROHS3 compliant. Moisture Sensitivity Level (MSL) is rated 1 (Unlimited) for all parts.

Q: What is the mechanical compatibility of substitute parts?

A: All substitute parts are through-hole radial package T-1 LEDs with 3.0mm to 3.10mm lens diameter and heights ranging from 5.30mm to 6.35mm. Verify PCB hole spacing and clearance for parts with maximum height of 6.35mm (HLMP-1301-G00FG, HLMP-1600).

Q: Can brightness differences affect circuit performance?

A: Yes. Brightness varies from 2.1mcd to 400mcd across substitute parts. Applications requiring consistent visual indication should verify brightness specifications against design requirements. Higher brightness parts (1254-10SURD/S530-A3 at 400mcd) may require optical diffusion or reduced drive current.

Q: Which substitute offers the best long-term availability?

A: SLR-343VR3F from Rohm Semiconductor offers the highest availability assurance with Active product status and parametric equivalence. Broadcom Limited (HLMP series) and Würth Elektronik (151031SS06000) also provide Active status with established supply chains.

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