Equivalent & Substitute Parts for 3GT-S Green LED T-1 Through Hole

Part Overview

The Bivar Inc. 3GT-S is a green LED indicator with clear lens transparency, designed for through-hole mounting applications. This component features a 3mm T-1 form factor with 40mcd brightness at 2.1V forward voltage and 20mA test current. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Alternative components must maintain compatibility with through-hole mounting, radial package configuration, and green wavelength specifications while accommodating variations in lens transparency, brightness levels, and electrical characteristics.

Key Parameters

Parameter	3GT-S Value	Specification Type
Manufacturer	Bivar Inc.	Source
Color	Green	Optical
Lens Transparency	Clear	Optical
Lens Size	3mm, T-1	Mechanical
Lens Style	Round with Domed Top	Mechanical
Millicandela Rating	40mcd	Optical
Voltage - Forward (Vf) Typical	2.1V	Electrical
Current - Test	20mA	Electrical
Viewing Angle	30°	Optical
Wavelength - Peak	568nm	Optical
Mounting Type	Through Hole	Mechanical
Package / Case	Radial	Mechanical
Height (Max)	4.50mm	Mechanical
Product Status	Obsolete	Availability

Substitute Part Grouping Explanation

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

Primary Compatibility Criteria:

Mounting Type: Through Hole (all substitutes must support radial through-hole mounting)
Lens Size: 3mm T-1 form factor (mechanical fit requirement)
Color: Green wavelength family (568nm to 575nm peak wavelength range)
Voltage Range: 1.9V to 5V forward voltage (accommodates circuit design flexibility)
Current Rating: 2mA to 20mA test current (allows for different circuit implementations)

Substitution Categories:

Category 1 - Direct Bivar Equivalent (Diffused Lens Variant): The 3GD-S maintains identical electrical specifications (2.1V, 20mA) and mechanical form factor but features diffused lens transparency instead of clear. This represents the closest direct substitute with active product status.

Category 2 - Broadcom HLMP Series (Voltage-Variant Substitutes): Parts HLMP-1640, HLMP-1641, and HLMP-1790 provide green LED indication in T-1 form factor with diffused lens transparency. These components vary in forward voltage (1.9V to 12V) and brightness (1.6mcd to 2.3mcd), requiring circuit redesign for voltage compatibility but maintaining mechanical interchangeability.

Category 3 - Würth Elektronik 151031VS06000 (Enhanced Specifications): This component offers 3mm round through-hole mounting with diffused lens and higher brightness (30mcd) at slightly elevated forward voltage (2.2V). Mechanical height differs (5.55mm vs 4.50mm), requiring PCB layout verification.

Category 4 - Everlight Electronics (Wavelength Variants): Parts 264-7SYGD/S530-E2 and 414SYGD/S530-E2 provide yellow-green wavelength (573nm to 575nm) with diffused lens transparency. These represent functional alternatives for applications where yellow-green indication is acceptable, with varying brightness and viewing angle characteristics.

Parameter Comparison

Part Number	Manufacturer	Color	Lens Transparency	Vf (Typ)	Current - Test	Millicandela	Viewing Angle	Wavelength Peak	Lens Size	Height (Max)	Product Status
3GT-S	Bivar Inc.	Green	Clear	2.1V	20mA	40mcd	30°	568nm	3mm, T-1	4.50mm	Obsolete
3GD-S	Bivar Inc.	Green	Diffused	2.1V	20mA	25mcd	40°	568nm	3mm, T-1	4.50mm	Active
151031VS06000	Würth Elektronik	Green	Diffused	2.2V	20mA	30mcd	60°	560nm	3.00mm Dia	5.55mm	Active
264-7SYGD/S530-E2	Everlight Electronics	Yellow-Green	Diffused	2V	20mA	50mcd	60°	575nm	2.90mm Dia	6.20mm	Active
414SYGD/S530-E2	Everlight Electronics	Yellow-Green	Diffused	2V	20mA	12.5mcd	140°	575nm	3.00mm Dia	7.00mm	Active
HLMP-1640	Broadcom Limited	Green	Diffused	5V	10mA	1.6mcd	60°	565nm	3mm, T-1	6.35mm	Active
HLMP-1641	Broadcom Limited	Green	Diffused	12V	13mA	1.6mcd	60°	565nm	3mm, T-1	6.35mm	Active
HLMP-1790	Broadcom Limited	Green	Diffused	1.9V	2mA	2.3mcd	50°	565nm	3mm, T-1	6.35mm	Active
HLMP-1790-A0002	Broadcom Limited	Green	Diffused	1.9V	2mA	2.3mcd	50°	565nm	3mm, T-1	6.35mm	Active
HLMP-1640-B00A1	Broadcom Limited	Green	Diffused, Tinted	5V	10mA	1.6mcd	120°	565nm	3mm, T-1	N/A	Active
HLMP-1640-B00A2	Broadcom Limited	Green	Diffused, Tinted	5V	10mA	1.6mcd	60°	565nm	3mm, T-1	N/A	Active

Engineering Selection Recommendations

Primary Recommendation - 3GD-S (Bivar Inc.): The 3GD-S is the preferred substitute for the obsolete 3GT-S. Both components share identical electrical specifications (2.1V forward voltage, 20mA test current), mechanical form factor (3mm T-1 radial through-hole), and wavelength (568nm peak). The only difference is lens transparency (diffused vs. clear), which affects viewing angle (40° vs. 30°) and brightness perception (25mcd vs. 40mcd). The 3GD-S maintains active product status with RoHS3 compliance and unlimited moisture sensitivity rating. This component requires no circuit redesign and provides direct mechanical and electrical compatibility.

Secondary Recommendation - 151031VS06000 (Würth Elektronik): This component provides active product status with RoHS3 compliance and REACH unaffected designation. Forward voltage (2.2V) and test current (20mA) remain within acceptable tolerance of the original specification. Brightness (30mcd) falls between the 3GT-S and 3GD-S. The primary consideration is mechanical height (5.55mm vs. 4.50mm), requiring PCB layout verification for clearance. Viewing angle (60°) provides wider light distribution than the original 30°. This part is suitable for applications where slight height variation and enhanced viewing angle are acceptable.

Tertiary Recommendation - HLMP-1790 or HLMP-1790-A0002 (Broadcom Limited): These components offer active product status with RoHS3 compliance and REACH unaffected designation. Forward voltage (1.9V) is compatible with low-voltage circuit designs. The primary limitation is significantly reduced brightness (2.3mcd vs. 40mcd) and test current (2mA vs. 20mA), making these suitable only for applications where lower brightness is acceptable. Mechanical form factor (3mm T-1) and wavelength (565nm) remain compatible. Height (6.35mm) exceeds the original specification.

Alternative for Yellow-Green Applications - 264-7SYGD/S530-E2 (Everlight Electronics): This component is suitable only when yellow-green wavelength (575nm) is functionally acceptable as a replacement for green (568nm). Forward voltage (2V) and test current (20mA) provide electrical compatibility. Brightness (50mcd) exceeds the original specification. Mechanical considerations include reduced lens diameter (2.90mm vs. 3mm) and increased height (6.20mm). Product status is active with RoHS3 compliance.

Not Recommended - HLMP-1640 and HLMP-1641 (Broadcom Limited): These components require significant circuit redesign due to elevated forward voltage (5V and 12V respectively) and reduced brightness (1.6mcd). While mechanically compatible, the electrical characteristics diverge substantially from the original specification, necessitating power supply and current-limiting resistor modifications.

Frequently Asked Questions (FAQ)

Q: Can the 3GD-S directly replace the 3GT-S without circuit modification?

A: Yes. The 3GD-S maintains identical forward voltage (2.1V) and test current (20mA) specifications. The only functional difference is lens transparency (diffused vs. clear), which affects viewing angle and brightness perception but does not require circuit redesign. Both components are rated for 20mA operation and 2.1V forward voltage.

Q: What is the primary difference between the 3GT-S and 3GD-S?

A: The 3GT-S features a clear lens with 40mcd brightness and 30° viewing angle. The 3GD-S features a diffused lens with 25mcd brightness and 40° viewing angle. Both share identical electrical specifications, wavelength (568nm), and mechanical form factor (3mm T-1 radial through-hole). The diffused lens provides wider light distribution at reduced peak brightness.

Q: Why is the 3GT-S obsolete, and what are the implications?

A: The 3GT-S is listed as obsolete by Bivar Inc., indicating discontinued production. Existing inventory (942 pieces) is available but will not be replenished. For ongoing production and design support, equivalent or substitute parts must be identified. The 3GD-S provides the most direct replacement with active product status.

Q: Can Broadcom HLMP-1640 or HLMP-1641 replace the 3GT-S?

A: These components are mechanically compatible (3mm T-1 form factor) but require circuit redesign. The HLMP-1640 operates at 5V forward voltage (vs. 2.1V) with 10mA test current (vs. 20mA). The HLMP-1641 operates at 12V forward voltage with 13mA test current. Both provide significantly reduced brightness (1.6mcd vs. 40mcd). Substitution requires power supply modification and current-limiting resistor recalculation.

Q: What is the significance of lens transparency (clear vs. diffused)?

A: Clear lens provides narrow, focused light output with higher peak brightness (40mcd) and narrow viewing angle (30°). Diffused lens scatters light over a wider area with lower peak brightness (25mcd) and wider viewing angle (40° to 60°). Clear lenses are preferred for applications requiring focused indication; diffused lenses are preferred for applications requiring wide-angle visibility. Both are functionally valid for LED indication applications.

Q: Is the Würth Elektronik 151031VS06000 suitable as a substitute?

A: Yes, with mechanical verification. Forward voltage (2.2V) and test current (20mA) are compatible. Brightness (30mcd) falls between the 3GT-S and 3GD-S. The primary consideration is mechanical height (5.55mm vs. 4.50mm), which requires PCB layout verification for clearance. Viewing angle (60°) provides wider light distribution. RoHS3 compliance and active product status support long-term availability.

Q: Can yellow-green LEDs (Everlight 264-7SYGD/S530-E2) replace green LEDs (3GT-S)?

A: Yellow-green LEDs are functional alternatives only when the application accepts yellow-green wavelength (575nm) instead of pure green (568nm). Electrical specifications (2V forward voltage, 20mA test current) are compatible. Brightness (50mcd) exceeds the original. Mechanical considerations include reduced lens diameter (2.90mm) and increased height (6.20mm). Substitution is application-dependent and requires verification that yellow-green indication is acceptable.

Q: What compliance certifications should be verified when selecting a substitute?

A: All listed substitute parts carry RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original 3GT-S specifications. Broadcom components include REACH Unaffected designation. Würth Elektronik 151031VS06000 includes REACH Unaffected designation. All components are classified as ECCN EAR99 and HTSUS 8541.41.0000. These certifications ensure regulatory compatibility with the original design.

Q: How does viewing angle affect LED substitution?

A: Viewing angle determines the cone of light distribution. The 3GT-S provides 30° viewing angle (narrow, focused). Substitutes range from 30° to 140°. Wider viewing angles (60° to 140°) provide visibility from more positions but reduce peak brightness perception. Narrower viewing angles (30° to 50°) provide focused indication. Selection depends on application requirements for light distribution and visibility range.

Q: What is the impact of millicandela rating differences on substitution?

A: Millicandela (mcd) rating indicates peak brightness. The 3GT-S provides 40mcd. Substitutes range from 1.6mcd to 50mcd. Lower brightness (1.6mcd to 2.3mcd) is suitable for low-light environments or applications requiring reduced power consumption. Higher brightness (30mcd to 50mcd) is suitable for high-ambient-light environments or applications requiring high visibility. Selection depends on application lighting conditions and visibility requirements.

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