3SRD-S LED RED DIFFUSED T-1 T/H Equivalent & Substitute Parts

Part Overview

The 3SRD-S is a red diffused LED indicator manufactured by Bivar Inc., designed for through-hole mounting applications. This T-1 form factor component operates at 1.7V forward voltage with a 40mcd brightness rating and 645nm peak wavelength. The part is actively produced and RoHS3 compliant with unlimited moisture sensitivity rating.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required, or when design specifications allow for components with comparable electrical and mechanical characteristics within the same product category.

Key Parameters

Parameter	Value
Manufacturer Part Number	3SRD-S
Manufacturer	Bivar Inc.
Color	Red
Lens Transparency	Diffused
Lens Size	3mm, T-1
Voltage - Forward (Vf) (Typ)	1.7V
Current - Test	20mA
Millicandela Rating	40mcd
Wavelength - Peak	645nm
Viewing Angle	40°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	4.50mm
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 3SRD-S is determined by the following critical parameters:

Electrical Compatibility Parameters:

Forward voltage (Vf) within acceptable circuit design tolerance
Test current rating compatible with circuit requirements
Wavelength characteristics within the red spectrum range (620nm–660nm)

Mechanical Compatibility Parameters:

Lens size: 3mm T-1 form factor
Mounting type: Through-hole radial configuration
Package case: Radial lead structure
Height constraints for PCB clearance

Optical Performance Parameters:

Lens transparency: Diffused
Millicandela rating for brightness requirements
Viewing angle for application visibility needs

Compliance Parameters:

RoHS3 compliance status
Moisture sensitivity level (MSL 1 – Unlimited)
Product status (Active preferred for new designs)

Substitute parts are grouped based on matching these parameters within acceptable engineering tolerances for the application.

Parameter Comparison

Parameter	3SRD-S (Bivar)	151031SS06000 (Würth)	4300F1LC (VCC)	HLMP-1600 (Broadcom)	HLMP-1601 (Broadcom)	HLMP-1700 (Broadcom)	HLMP-1700-B0002 (Broadcom)	HLMP-K101 (Broadcom)	HLMP-K150 (Broadcom)	HLMP-K150-C0002 (Broadcom)	LTL-1CHE (Lite-On)
Color	Red	Red	Red	Red	Red	Red	Red	Red	Red	Red	Red
Lens Transparency	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused
Lens Size	3mm, T-1	3.00mm Dia	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1	3.10mm Dia
Voltage - Forward (Vf) (Typ)	1.7V	2.2V	1.8V	5V	12V	1.7V	1.7V	1.8V	1.7V	1.7V	2V
Current - Test	20mA	20mA	2mA	10mA	13mA	2mA	2mA	20mA	1mA	1mA	20mA
Millicandela Rating	40mcd	35mcd	1.8mcd	2.1mcd	2.1mcd	2.1mcd	2.1mcd	45mcd	2mcd	2mcd	12.6mcd
Wavelength - Peak	645nm	650nm	635nm	635nm	635nm	635nm	635nm	645nm	660nm	660nm	635nm
Viewing Angle	40°	60°	50°	60°	60°	50°	50°	60°	60°	60°	60°
Mounting Type	Through Hole	Through Hole	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	Radial	Radial
Height (Max)	4.50mm	5.55mm	6.35mm	6.35mm	6.35mm	6.35mm	6.35mm	6.35mm	6.35mm	6.35mm	5.20mm
Product Status	Active	Active	Not For New Designs	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Bulk	Bulk	Bulk	Bulk	Bulk	Bulk	Cut Tape (CT)	Bulk	Bulk	Cut Tape (CT)	Bulk

Engineering Selection Recommendations

Primary Substitutes (Closest Electrical Match):

HLMP-1700 and HLMP-1700-B0002 (Broadcom Limited) are the closest electrical equivalents to the 3SRD-S. Both share identical forward voltage (1.7V), matching wavelength characteristics (635nm peak), and identical mounting configuration. The primary difference is packaging format: HLMP-1700 is supplied in bulk, while HLMP-1700-B0002 is supplied in cut tape format. Both are Active status products with full RoHS3 compliance. The HLMP-1700-B0002 variant provides 530,300 units in bulk inventory availability.

HLMP-K150 and HLMP-K150-C0002 (Broadcom Limited) are electrically compatible with matching 1.7V forward voltage and identical mounting type. These parts operate at lower test current (1mA versus 20mA) and provide reduced brightness (2mcd versus 40mcd). Wavelength peak is 660nm, within the red spectrum range. These parts are suitable for applications where lower brightness is acceptable.

Secondary Substitutes (Acceptable Electrical Variation):

HLMP-K101 (Broadcom Limited) provides 45mcd brightness, exceeding the 3SRD-S specification. Forward voltage is 1.8V with 20mA test current, matching the original part's current rating. Wavelength peak is 645nm, identical to the 3SRD-S. This part is suitable for applications requiring higher brightness output.

151031SS06000 (Würth Elektronik) operates at 2.2V forward voltage with 20mA test current and 35mcd brightness. Wavelength peak is 650nm. Height is 5.55mm, exceeding the 3SRD-S maximum of 4.50mm. This part is suitable for applications with adequate PCB clearance and higher voltage tolerance.

LTL-1CHE (Lite-On Inc.) operates at 2V forward voltage with 20mA test current and 12.6mcd brightness. Wavelength peak is 635nm. Height is 5.20mm. This part is suitable for applications with voltage tolerance and adequate PCB clearance.

Not Recommended for New Designs:

4300F1LC (Visual Communications Company - VCC) carries "Not For New Designs" product status. Although electrically compatible with 1.8V forward voltage and T-1 form factor, this part should not be selected for new circuit designs.

HLMP-1600 and HLMP-1601 (Broadcom Limited) operate at 5V and 12V forward voltage respectively, requiring different circuit design than the 1.7V 3SRD-S. These parts are not suitable substitutes for the original application.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1700 directly replace 3SRD-S in existing designs?

A: HLMP-1700 shares identical electrical specifications (1.7V forward voltage, 20mA test current) and mounting configuration with the 3SRD-S. The primary difference is physical height: HLMP-1700 measures 6.35mm maximum height versus 3SRD-S at 4.50mm. Direct replacement is possible if PCB clearance accommodates the additional 1.85mm height.

Q: What is the difference between HLMP-1700 and HLMP-1700-B0002?

A: Both parts are electrically and mechanically identical. The difference is packaging format: HLMP-1700 is supplied in bulk packaging, while HLMP-1700-B0002 is supplied in cut tape format. Selection depends on assembly process requirements and inventory management preferences.

Q: Why do some substitute parts have different forward voltages?

A: Forward voltage is determined by the LED semiconductor material and design. Parts with different forward voltages (such as HLMP-1600 at 5V or HLMP-1601 at 12V) require different circuit designs and cannot be substituted without circuit modification. The 3SRD-S operates at 1.7V, limiting direct substitution to parts with matching or closely compatible voltage ratings.

Q: Is brightness (millicandela rating) a critical substitution parameter?

A: Brightness is application-dependent. The 3SRD-S provides 40mcd. HLMP-K101 provides 45mcd (higher brightness), while HLMP-K150 provides 2mcd (lower brightness). Selection depends on visibility requirements. Higher brightness parts consume more power; lower brightness parts reduce power consumption but may be insufficient for visibility-critical applications.

Q: Can I substitute a part with a different viewing angle?

A: Viewing angle affects light distribution. The 3SRD-S has a 40° viewing angle. Substitutes with 50°, 60°, or other angles distribute light differently. Selection depends on application requirements. Wider viewing angles (60°) provide visibility from more directions; narrower angles (40°) concentrate light in a specific direction.

Q: Are all listed substitutes RoHS3 compliant?

A: All listed substitute parts carry RoHS3 compliance status, matching the 3SRD-S compliance level. All parts have MSL 1 (Unlimited) moisture sensitivity rating.

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

A: Parts marked "Not For New Designs" (such as 4300F1LC) are in production but not recommended for incorporation into new circuit designs. These parts may have limited future availability or are being phased out. For new designs, select parts with "Active" product status.

Q: How does wavelength affect substitution?

A: Wavelength determines the perceived color and spectral characteristics of the LED. The 3SRD-S has a 645nm peak wavelength. Substitute parts range from 635nm to 660nm, all within the red spectrum. Wavelength differences are typically imperceptible to human vision in indicator applications but may affect optical sensor response in specialized applications.

Q: Can I use HLMP-K150 as a direct replacement for high-brightness applications?

A: HLMP-K150 operates at 1.7V forward voltage (matching 3SRD-S) but provides only 2mcd brightness versus 40mcd for the 3SRD-S. This part is not suitable for applications requiring the original brightness level. Use HLMP-K101 (45mcd) for higher brightness requirements.

Q: What packaging options are available?

A: Most substitute parts are available in bulk packaging. Cut tape format is available for HLMP-1700-B0002 and HLMP-K150-C0002. Packaging selection depends on assembly process: bulk packaging for manual assembly or small-volume production; cut tape for automated pick-and-place assembly.

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