3SGT-S LED Green Clear T-1 Through Hole Equivalent & Substitute Parts

Part Overview

The 3SGT-S is a green LED indication component manufactured by Bivar Inc., featuring a clear lens with 50mcd brightness rating in a T-1 (3mm) through-hole package. This part operates at 2.1V forward voltage with a 20mA test current and provides a 30° viewing angle. The 3SGT-S is classified as obsolete, making equivalent substitute parts necessary for ongoing design requirements and production continuity.

Substiute Parts

3SGT-S

Bivar Inc.In Stock: 9353SGT-S Datasheet

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3SGD-S

Bivar Inc.In Stock: 11463SGD-S Datasheet

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1254-10SYGD/S530-E2

Everlight Electronics Co LtdIn Stock: 7001254-10SYGD/S530-E2 Datasheet

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1254SYGD/S530-E2

Everlight Electronics Co LtdIn Stock: 10071254SYGD/S530-E2 Datasheet

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SLI-343M8G3F

Rohm SemiconductorIn Stock: 2287SLI-343M8G3F Datasheet

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SLI-343P8G3F

Rohm SemiconductorIn Stock: 15941SLI-343P8G3F Datasheet

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SSL-LX3054SUGD

Lumex Opto/Components Inc.In Stock: 752SSL-LX3054SUGD Datasheet

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Key Parameters

Substitute Part Grouping Explanation

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

Primary Compatibility Criteria:

• Lens size: 3mm T-1 form factor
• Mounting type: Through hole radial configuration
• Color: Green wavelength range (560nm–575nm)
• Forward voltage: 2.0V–2.2V range
• Test current: 20mA standard
• Package type: Radial through-hole

Substitution Categories:

Category 1: Direct Bivar Equivalent The 3SGD-S (Bivar Inc.) shares identical electrical specifications (2.1V, 20mA, 568nm peak wavelength) and mechanical form factor. The primary difference is lens transparency (diffused vs. clear) and brightness rating (30mcd vs. 50mcd). This part is active status.

Category 2: Rohm Semiconductor EXCELED™ Series The SLI-343M8G3F and SLI-343P8G3F operate within compatible voltage ranges (2.2V) and current specifications (20mA). Both feature diffused lenses, T-1 form factor, and green wavelengths (572nm and 560nm respectively). These parts are active status with RoHS3 compliance.

Category 3: Everlight Electronics Yellow-Green Series The 1254-10SYGD/S530-E2 and 1254SYGD/S530-E2 operate at 2V forward voltage with 20mA test current. These parts feature yellow-green wavelengths (573nm dominant, 575nm peak) and diffused lenses in T-1 form factor. Both are active status with RoHS3 compliance.

Category 4: Lumex Opto/Components The SSL-LX3054SUGD operates at 2.2V with 20mA test current, features a diffused green lens at 574nm peak wavelength, and T-1 form factor. This part is active status with RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): The 3SGD-S (Bivar Inc.) is the primary equivalent. It maintains the same manufacturer, electrical characteristics (2.1V, 20mA), and mechanical form factor as the 3SGT-S. The transition from clear to diffused lens increases viewing angle from 30° to 40° and reduces brightness from 50mcd to 30mcd. This part is active status with RoHS3 compliance, ensuring long-term availability and regulatory compliance.

For Active Status with Enhanced Brightness: The SLI-343M8G3F (Rohm Semiconductor EXCELED™ series) provides 150mcd brightness at 2.2V forward voltage. This part is active status with RoHS3 and REACH compliance. Height increases to 5.60mm. The 40° viewing angle and 572nm wavelength remain within green spectrum parameters.

For Brightness-Constrained Applications: The SLI-343P8G3F (Rohm Semiconductor) delivers 22mcd at 2.2V, closest to the 3SGT-S brightness profile among active alternatives. This part is active status with RoHS3 and REACH compliance. The 560nm wavelength represents the lower green spectrum boundary.

For Yellow-Green Wavelength Applications: The 1254SYGD/S530-E2 (Everlight Electronics, tape & reel packaging) matches the 3SGT-S viewing angle (30°) at 160mcd brightness with 2V forward voltage. This part is active status with RoHS3 compliance. The 575nm peak wavelength shifts toward yellow-green spectrum.

For Wide Viewing Angle Requirements: The SSL-LX3054SUGD (Lumex Opto/Components) provides 60° viewing angle at 60mcd brightness with 2.2V forward voltage. This part is active status with RoHS3 compliance. Height is 5.25mm, slightly exceeding the original 4.50mm specification.

Frequently Asked Questions (FAQ)

Q: Can the 3SGD-S directly replace the 3SGT-S in all applications? A: The 3SGD-S shares identical electrical specifications (2.1V, 20mA) and manufacturer origin. The lens transparency change from clear to diffused affects optical characteristics: viewing angle increases from 30° to 40°, and brightness decreases from 50mcd to 30mcd. Applications requiring specific brightness or narrow viewing angles must evaluate this trade-off.

Q: What is the significance of forward voltage differences (2.1V vs. 2.2V)? A: Forward voltage tolerance of ±0.1V is within standard LED operating margins. The 3SGT-S operates at 2.1V, while Rohm and Lumex alternatives operate at 2.2V. This 0.1V difference requires circuit verification to ensure current-limiting resistor values remain appropriate for the 20mA test current specification.

Q: Are yellow-green LEDs (573nm–575nm) suitable replacements for pure green (568nm)? A: Yellow-green wavelengths shift the color perception toward yellow. The Everlight 1254-10SYGD/S530-E2 and 1254SYGD/S530-E2 operate within compatible electrical parameters (2V, 20mA) but produce visually distinct color output. Application requirements for specific color perception must be evaluated.

Q: What packaging differences exist among substitute parts? A: The 3SGT-S is specified as radial through-hole. The 3SGD-S uses bulk packaging, SLI-343M8G3F and SLI-343P8G3F use bulk packaging, 1254-10SYGD/S530-E2 uses bulk packaging, 1254SYGD/S530-E2 uses tape & reel (TR), and SSL-LX3054SUGD packaging is not specified. Packaging affects procurement and assembly processes but does not alter electrical or mechanical compatibility.

Q: How do brightness ratings (millicandela) affect substitution decisions? A: The 3SGT-S provides 50mcd. Substitute options range from 22mcd (SLI-343P8G3F) to 160mcd (1254SYGD/S530-E2). Higher brightness increases visibility but may require circuit current adjustment. Lower brightness reduces visibility but may be acceptable for indicator applications. Circuit design must accommodate the selected brightness level.

Q: What is the impact of height differences on PCB layout? A: The 3SGT-S maximum height is 4.50mm. Substitute parts range from 4.50mm (3SGD-S) to 5.60mm (SLI-343M8G3F and SLI-343P8G3F). Height increases of 0.7mm–1.1mm may affect PCB clearance, component spacing, and enclosure design. Physical layout verification is required for space-constrained applications.

Q: Are all substitute parts RoHS3 compliant? A: The 3SGT-S compliance status is not specified. All active substitute parts listed (3SGD-S, SLI-343M8G3F, SLI-343P8G3F, 1254-10SYGD/S530-E2, 1254SYGD/S530-E2, SSL-LX3054SUGD) are RoHS3 compliant, ensuring regulatory alignment for new designs and production.

Q: What viewing angle considerations apply to substitution? A: The 3SGT-S provides 30° viewing angle. Substitute parts offer 30°, 40°, or 60° viewing angles. Narrower angles (30°) concentrate light intensity; wider angles (40°–60°) distribute light across broader areas. Application requirements for visibility direction and intensity must determine acceptable viewing angle ranges.