Equivalent & Substitute Parts for 3SRT-S Red LED T-1 Through Hole

Part Overview

The 3SRT-S is a red LED indication component manufactured by Bivar Inc., featuring a 3mm T-1 through-hole package with a clear domed lens. This discrete 1.7V radial LED operates at 20mA test current with a 60mcd brightness rating and 30° viewing angle. The component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute parts must maintain compatibility with through-hole mounting, similar electrical characteristics, and equivalent mechanical form factors.

Key Parameters

Parameter	3SRT-S Value	Specification Type
Manufacturer	Bivar Inc.	Source
Color	Red	Optical
Lens Transparency	Clear	Optical
Millicandela Rating	60mcd	Brightness
Lens Size	3mm, T-1	Mechanical
Voltage - Forward (Vf) Typical	1.7V	Electrical
Current - Test	20mA	Electrical
Viewing Angle	30°	Optical
Mounting Type	Through Hole	Mechanical
Wavelength - Peak	645nm	Optical
Package / Case	Radial	Mechanical
Height (Max)	4.50mm	Mechanical
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Environmental
Product Status	Obsolete	Availability

Substitute Part Grouping Explanation

Substitution logic for the 3SRT-S is based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Lens Size: 3mm, T-1 form factor
Mounting Type: Through Hole radial configuration
Color: Red wavelength range (635nm–650nm peak)
Voltage - Forward (Vf): 1.7V–2.2V range
Current - Test: 2mA–20mA range
Viewing Angle: 30°–60° acceptable range
Millicandela Rating: Brightness compatibility within application tolerance
Package / Case: Radial through-hole
Moisture Sensitivity Level: MSL 1 (Unlimited)

Direct Equivalent Category: Parts that maintain identical or near-identical electrical and mechanical specifications with active product status.

Similar Substitute Category: Parts that share the same form factor and mounting type but may have variations in brightness, forward voltage, viewing angle, or lens transparency. These parts are suitable for applications where the specific parameter variation is acceptable.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Current - Test	Millicandela	Viewing Angle	Wavelength - Peak	Lens Transparency	Height (Max)	Product Status	RoHS Status
3SRT-S	Bivar Inc.	1.7V	20mA	60mcd	30°	645nm	Clear	4.50mm	Obsolete	Not Specified
3SRC-S	Bivar Inc.	1.7V	20mA	60mcd	30°	645nm	Clear	4.50mm	Active	ROHS3 Compliant
151031SS06000	Würth Elektronik	2.2V	20mA	35mcd	60°	650nm	Diffused	5.55mm	Active	ROHS3 Compliant
4300F1LC	Visual Communications Company - VCC	1.8V	2mA	1.8mcd	50°	635nm	Diffused	6.35mm	Not For New Designs	ROHS3 Compliant
HLMP-1301-G00FG	Broadcom Limited	1.9V	10mA	8.6mcd	60°	635nm	Diffused	6.35mm	Active	ROHS3 Compliant
HLMP-1600	Broadcom Limited	5V	10mA	2.1mcd	60°	635nm	Diffused	6.35mm	Active	ROHS3 Compliant
HLMP-1600-D00A1	Broadcom Limited	5V	10mA	2.1mcd	60°	635nm	Diffused, Tinted	Not Specified	Active	ROHS3 Compliant
HLMP-1600-D00A2	Broadcom Limited	5V	10mA	2.1mcd	60°	635nm	Diffused, Tinted	Not Specified	Active	ROHS3 Compliant
HLMP-1601	Broadcom Limited	12V	13mA	2.1mcd	60°	635nm	Diffused	6.35mm	Active	ROHS3 Compliant
HLMP-1700	Broadcom Limited	1.7V	2mA	2.1mcd	50°	635nm	Diffused	6.35mm	Active	ROHS3 Compliant
HLMP-1700-B0002	Broadcom Limited	1.7V	2mA	2.1mcd	50°	635nm	Diffused	6.35mm	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent Substitution:

The 3SRC-S manufactured by Bivar Inc. is the direct equivalent to the obsolete 3SRT-S. Both parts share identical electrical specifications (1.7V forward voltage, 20mA test current, 60mcd brightness), mechanical form factor (3mm T-1 through-hole radial), and optical characteristics (645nm peak wavelength, clear lens, 30° viewing angle). The 3SRC-S is currently active with ROHS3 compliance and represents the primary substitution path for existing 3SRT-S applications.

Alternative Substitutes for Voltage-Compatible Applications:

The HLMP-1700 and HLMP-1700-B0002 (Broadcom Limited) are suitable alternatives for applications where lower brightness and reduced test current are acceptable. Both maintain the 1.7V forward voltage specification and 3mm T-1 form factor. The HLMP-1700-B0002 is available in Cut Tape packaging with higher inventory levels (21,034 pcs). These parts feature diffused lenses and operate at 2mA test current with 2.1mcd brightness.

Substitutes for Higher Voltage Applications:

The HLMP-1600 and HLMP-1601 (Broadcom Limited) are suitable for circuit designs requiring higher forward voltage operation (5V and 12V respectively). Both maintain the 3mm T-1 through-hole form factor and red wavelength specification. These parts are active with ROHS3 compliance.

Substitutes for Increased Viewing Angle Applications:

The 151031SS06000 (Würth Elektronik) and HLMP-1301-G00FG (Broadcom Limited) provide 60° viewing angles compared to the 3SRT-S 30° specification. The 151031SS06000 operates at 2.2V forward voltage with 35mcd brightness. The HLMP-1301-G00FG operates at 1.9V forward voltage with 8.6mcd brightness. Both are active with ROHS3 compliance.

Parts Not Recommended for New Designs:

The 4300F1LC (Visual Communications Company - VCC) is classified as "Not For New Designs" and should not be selected for new applications despite ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can the 3SRC-S directly replace the 3SRT-S in existing designs?

A: Yes. The 3SRC-S is the direct equivalent with identical electrical and mechanical specifications. Both parts feature 1.7V forward voltage, 20mA test current, 60mcd brightness, 3mm T-1 through-hole radial package, and 645nm peak wavelength. The 3SRC-S is currently active with ROHS3 compliance.

Q: What is the primary difference between the 3SRT-S and HLMP-1700 series?

A: The HLMP-1700 and HLMP-1700-B0002 operate at lower test current (2mA versus 20mA) and lower brightness (2.1mcd versus 60mcd). Both maintain the 1.7V forward voltage and 3mm T-1 form factor. The HLMP-1700 series features diffused lenses rather than clear lenses. These parts are suitable only if the application can tolerate significantly reduced brightness.

Q: Are the HLMP-1600 and HLMP-1601 suitable substitutes?

A: The HLMP-1600 (5V) and HLMP-1601 (12V) are suitable only for applications where the circuit design supports higher forward voltage operation. These parts maintain the 3mm T-1 through-hole form factor but operate at substantially different voltage levels (5V and 12V versus 1.7V). They are not pin-compatible with 1.7V circuits without circuit modification.

Q: What is the difference between clear and diffused lens options?

A: The 3SRT-S features a clear lens providing focused light output with a narrow 30° viewing angle. Substitute parts with diffused lenses (such as HLMP-1700, HLMP-1301-G00FG, and 151031SS06000) scatter light over wider viewing angles (50°–60°) but reduce peak brightness in the direct viewing direction. Lens transparency selection depends on application requirements for light distribution and visibility.

Q: Can I use HLMP-1600-D00A1 or HLMP-1600-D00A2 as substitutes?

A: These parts are right-angle through-hole variants of the HLMP-1600 series. They operate at 5V forward voltage and are suitable only for applications where the circuit design supports 5V operation and right-angle mounting orientation is acceptable. They are not suitable for radial through-hole mounting applications.

Q: What packaging options are available for substitute parts?

A: The 3SRC-S is available in Bulk packaging. The HLMP-1700-B0002 is available in Cut Tape (CT) packaging with 21,034 pcs inventory. Other substitute parts are available in Bulk packaging. Packaging selection depends on production volume and assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended active substitute parts (3SRC-S, 151031SS06000, HLMP-1301-G00FG, HLMP-1600, HLMP-1600-D00A1, HLMP-1600-D00A2, HLMP-1601, HLMP-1700, HLMP-1700-B0002) are ROHS3 compliant. The 4300F1LC is ROHS3 compliant but classified as "Not For New Designs."

Q: What is the Moisture Sensitivity Level (MSL) for substitute parts?

A: All substitute parts listed maintain MSL 1 (Unlimited) classification, matching the 3SRT-S specification. This indicates no moisture sensitivity restrictions for storage and handling.

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