3SGD

Part Overview

The 3SGD is a green diffused LED indicator light manufactured by Bivar Inc., featuring a T-1 (3mm) through-hole package. The device is rated for 30 millicandela with a forward voltage of 2.1V at 20mA test current. The product is currently marked as obsolete, making identification of functional equivalents and substitutes necessary for system redesign or repair applications. Alternative components must maintain compatibility with the through-hole radial mounting configuration and meet equivalent optical and electrical specifications.

Key Parameters

Parameter	Specification
Manufacturer	Bivar Inc.
Color	Green
Lens Transparency	Diffused
Lens Size	3mm, T-1
Voltage - Forward (Vf) Typical	2.1V
Current - Test	20mA
Millicandela Rating	30mcd
Viewing Angle	40°
Mounting Type	Through Hole
Package / Case	Radial
Wavelength - Peak	568nm
Height (Max)	4.50mm
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Packaging	-

Substitute Part Grouping Explanation

Substitution eligibility for the 3SGD green T-1 LED is determined by the following allowable parameter variations:

Critical Parameters (Must Match or Remain Compatible):

Lens size: 3mm, T-1
Mounting type: Through hole
Package case: Radial
Color: Green
Lens transparency: Diffused
Voltage forward (Vf): 2.1V ±0.1V tolerance range
Current - test: 20mA
Moisture sensitivity level: 1 (Unlimited)

Allowable Variation Parameters:

Millicandela rating: 30mcd baseline; substitutes may range from 30mcd to 160mcd (brightness can increase without functional impact)
Viewing angle: 40° baseline; substitutes ranging from 30° to 60° are acceptable
Wavelength - peak: 568nm ±5nm variation (green spectrum tolerance)
Height maximum: 4.50mm baseline; substitutes up to 5.90mm accommodate typical circuit board layouts
Manufacturer: Bivar Inc., Everlight Electronics, Rohm Semiconductor, Lumex Opto/Components, Kingbright

Parametric equivalents maintain identical electrical and optical characteristics with only packaging variations (bulk versus tape & reel). Similar substitutes introduce minor variations in brightness or viewing angle while preserving core green LED indicator functionality.

Parameter Comparison

Part Number	Manufacturer	Color	Lens Size	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Peak Wavelength	Height (Max)	Mounting Type	RoHS Status	Product Status
3SGD	Bivar Inc.	Green	3mm, T-1	2.1V	20mA	30mcd	40°	568nm	4.50mm	Through Hole	-	Obsolete
3SGD-S	Bivar Inc.	Green	3mm, T-1	2.1V	20mA	30mcd	40°	568nm	4.50mm	Through Hole	ROHS3 Compliant	Active
WP710A10SGD	Kingbright	Green	3mm, T-1	2.2V	20mA	40mcd	40°	568nm	5.90mm	Through Hole	ROHS3 Compliant	Active
SLI-343M8G3F	Rohm Semiconductor	Green	3.10mm Dia	2.2V	20mA	150mcd	40°	-	5.60mm	Through Hole	ROHS3 Compliant	Active
SSL-LX3054SUGD	Lumex Opto/Components Inc.	Green	3mm, T-1	2.2V	20mA	60mcd	60°	574nm	5.25mm	Through Hole	ROHS3 Compliant	Active
1254-10SYGD/S530-E2	Everlight Electronics Co Ltd	Yellow-Green	3.00mm Dia	2V	20mA	63mcd	40°	575nm	5.20mm	Through Hole	ROHS3 Compliant	Active
1254SYGD/S530-E2	Everlight Electronics Co Ltd	Yellow-Green	3.00mm Dia	2V	20mA	160mcd	30°	575nm	5.20mm	Through Hole	-	Active

Engineering Selection Recommendations

Primary Replacement: 3SGD-S (Bivar Inc., Active Status) The 3SGD-S is the direct parametric equivalent, providing identical electrical and optical performance to the obsolete 3SGD. This part maintains the original 30mcd brightness, 2.1V forward voltage, and 568nm peak wavelength. Bivar Inc. designed this successor specifically for the 3SGD with ROHS3 compliance certification. Selection of 3SGD-S eliminates any design redesign requirements.

Secondary Replacements with Active Manufacturing:

WP710A10SGD (Kingbright, Active): Delivers identical green spectrum (568nm) and viewing angle (40°) with slightly elevated forward voltage (2.2V) and 40mcd brightness. ROHS3 compliance confirmed. Suitable for designs tolerant of increased brightness.
SSL-LX3054SUGD (Lumex Opto/Components, Active): Maintains green wavelength compatibility (574nm) with increased viewing angle (60°) and 60mcd brightness. ROHS3 compliance confirmed.
SLI-343M8G3F (Rohm Semiconductor, Active): Offers the brightest alternative at 150mcd with green spectrum compliance and 2.2V forward voltage. ROHS3 compliance and REACH compliance confirmed.

Color-Shifted Alternatives:

1254-10SYGD/S530-E2 and 1254SYGD/S530-E2 (Everlight Electronics, Active): Yellow-green wavelength substitutes (573–575nm) with enhanced brightness ratings. Use only where yellow-green indication is functionally acceptable. Both ROHS3 compliant.

All recommended substitutes maintain through-hole radial mounting compatibility, 20mA test current specification, and MSL 1 (unlimited) moisture sensitivity ratings.

Frequently Asked Questions (FAQ)

Q: Can the 3SGD be directly replaced with 3SGD-S? A: Yes. The 3SGD-S is the parametric equivalent with identical electrical and optical specifications. The only differences are product status (active versus obsolete) and RoHS3 compliance certification.

Q: What voltage tolerance exists for forward voltage substitutions? A: The 3SGD operates at 2.1V typical. Substitutes rated at 2.0V or 2.2V remain within acceptable tolerance for standard LED circuit designs using series current-limiting resistors.

Q: Are Everlight yellow-green LEDs compatible replacements? A: The 1254-10SYGD/S530-E2 and 1254SYGD/S530-E2 differ in color specification (yellow-green versus pure green). While electrically compatible at 2V forward voltage and 20mA test current, the wavelength shift (573–575nm versus 568nm) produces visible color differentiation. Substitution is valid only when yellow-green indication is functionally acceptable.

Q: Can a brighter LED substitute reduce circuit design requirements? A: Substitutes with higher millicandela ratings (such as SLI-343M8G3F at 150mcd versus 3SGD at 30mcd) are mechanically and electrically compatible. However, brightness increases may require circuit resistor value adjustments to maintain design-specified LED current.

Q: What viewing angle differences should be considered? A: The 3SGD operates at 40° viewing angle. Substitutes range from 30° (1254SYGD/S530-E2) to 60° (SSL-LX3054SUGD). Narrower angles concentrate brightness in a focused beam; wider angles distribute brightness across a broader field. Selection depends on application visibility requirements.

Q: Are all substitutes RoHS3 compliant? A: The 3SGD-S, WP710A10SGD, SLI-343M8G3F, SSL-LX3054SUGD, 1254-10SYGD/S530-E2, and 1254SYGD/S530-E2 carry ROHS3 compliance certification. The original 3SGD does not specify RoHS status.

Q: What is the maximum height tolerance for circuit board mounting? A: The 3SGD measures 4.50mm maximum height. Substitutes range from 5.20mm to 5.90mm. These height variations remain compatible with standard through-hole circuit layouts, though component density requirements should be verified.

Q: Why is packaging (bulk versus tape & reel) listed as a substitution parameter? A: The 3SGD-S (Bulk) and 3SGD (original packaging) differ only in supply format. Tape & reel packaging (1254SYGD/S530-E2) provides automated assembly compatibility for high-volume production. Bulk packaging suits repair and prototyping applications.

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