3GDL-201 Equivalent & Substitute Parts Reference

Part Overview

The 3GDL-201 is a green diffused LED indicator manufactured by Bivar Inc., configured as a T-1 through-hole radial component with a 3mm lens. This part operates at 2.1V forward voltage with a 2mA test current and delivers 2 millicandela brightness. The 3GDL-201 is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. Substitute components must maintain compatibility with the original electrical specifications, mechanical form factor, and mounting requirements while offering active product status and current availability.

Key Parameters

Parameter	3GDL-201 Specification
Manufacturer	Bivar Inc.
Color	Green
Lens Transparency	Diffused
Lens Size	3mm, T-1
Lens Style	Round with Domed Top
Voltage - Forward (Vf) Typical	2.1V
Current - Test	2mA
Millicandela Rating	2mcd
Wavelength - Peak	568nm
Viewing Angle	35°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	5.10mm
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution logic for the 3GDL-201 is based on the following critical parameters that determine functional and mechanical compatibility:

Primary Compatibility Criteria:

Color: Green
Lens Transparency: Diffused
Lens Size: 3mm, T-1
Mounting Type: Through Hole
Package Type: Radial
Wavelength - Peak: 568nm ±10nm range (560nm to 575nm acceptable)

Secondary Electrical Criteria:

Voltage - Forward (Vf): 2.0V to 2.2V range
Current - Test: 2mA to 20mA range
Millicandela Rating: 1.6mcd minimum

Tertiary Mechanical Criteria:

Lens Style: Round with Domed Top
Height (Max): 5.10mm to 6.58mm range
Viewing Angle: 20° to 60° range

Substitute parts are grouped into two categories: Direct Electrical Equivalents (matching 2.1V forward voltage and low current operation) and Compatible Alternatives (matching form factor and optical characteristics with different voltage/current ratings for circuit redesign scenarios).

Parameter Comparison

Part Number	Manufacturer	Color	Lens Transparency	Vf (Typ)	Current - Test	mcd Rating	Peak Wavelength	Viewing Angle	Height (Max)	Product Status
3GDL-201	Bivar Inc.	Green	Diffused	2.1V	2mA	2mcd	568nm	35°	5.10mm	Obsolete
3GC-201-S	Bivar Inc.	Green	Clear	2.1V	20mA	40mcd	568nm	20°	6.58mm	Active
151031VS06000	Würth Elektronik	Green	Diffused	2.2V	20mA	30mcd	560nm	60°	5.55mm	Active
264-7SYGD/S530-E2	Everlight Electronics Co Ltd	Yellow-Green	Diffused	2V	20mA	50mcd	575nm	60°	6.20mm	Active
HLMP-1640	Broadcom Limited	Green	Diffused	5V	10mA	1.6mcd	565nm	60°	6.35mm	Active
HLMP-1641	Broadcom Limited	Green	Diffused	12V	13mA	1.6mcd	565nm	60°	6.35mm	Active
HLMP-1790	Broadcom Limited	Green	Diffused	1.9V	2mA	2.3mcd	565nm	50°	6.35mm	Active
HLMP-1790-A0002	Broadcom Limited	Green	Diffused	1.9V	2mA	2.3mcd	565nm	50°	6.35mm	Active
LTL-4231	Lite-On Inc.	Green	Diffused	2.1V	10mA	12.6mcd	565nm	40°	6.55mm	Active

Engineering Selection Recommendations

Category 1: Direct Electrical Equivalents (Recommended Primary Substitutes)

The following parts maintain the 2.1V forward voltage specification of the 3GDL-201 and operate at comparable current levels, requiring minimal circuit modification:

LTL-4231 (Lite-On Inc.): Operates at 2.1V with 10mA test current. Delivers 12.6mcd brightness with diffused green lens. Active product status with ROHS3 compliance and REACH affected designation. Height of 6.55mm accommodates standard through-hole mounting. Viewing angle of 40° closely matches the original 35° specification.
HLMP-1790 / HLMP-1790-A0002 (Broadcom Limited): Operates at 1.9V with 2mA test current, matching the original low-current design intent. Delivers 2.3mcd brightness with diffused green lens. Active product status with ROHS3 compliance and REACH unaffected designation. Available in both bulk and cut tape packaging. Height of 6.35mm and 50° viewing angle provide compatible optical characteristics.

Category 2: Form Factor Compatible Alternatives (Circuit Redesign Required)

The following parts maintain the 3mm T-1 through-hole radial form factor and diffused green lens but require circuit voltage/current adjustment:

151031VS06000 (Würth Elektronik): Operates at 2.2V with 20mA test current. Delivers 30mcd brightness with diffused green lens. Active product status with ROHS3 compliance and REACH unaffected designation. Peak wavelength of 560nm falls within acceptable green spectrum range. Height of 5.55mm matches original mechanical envelope. Series designation WL-TMRC indicates established product line.

Category 3: Bivar Inc. Product Line Continuation

3GC-201-S (Bivar Inc.): Maintains Bivar manufacturer continuity with 2.1V forward voltage. Clear lens variant (not diffused) delivers 40mcd brightness. Active product status with higher current requirement (20mA). Height of 6.58mm exceeds original specification. Suitable for applications requiring increased brightness with same voltage platform.

Category 4: Voltage-Specific Alternatives (Specialized Applications)

HLMP-1640 (Broadcom Limited): 5V forward voltage with 10mA test current. Delivers 1.6mcd brightness. Active product status with ROHS3 compliance. Suitable for 5V logic-level circuits.
HLMP-1641 (Broadcom Limited): 12V forward voltage with 13mA test current. Delivers 1.6mcd brightness. Active product status with ROHS3 compliance. Suitable for 12V industrial control circuits.

Category 5: Color Variant (Spectral Shift)

264-7SYGD/S530-E2 (Everlight Electronics Co Ltd): Yellow-green color (573nm dominant wavelength) with diffused lens. Operates at 2V with 20mA test current. Delivers 50mcd brightness. Active product status with ROHS3 compliance. Suitable for applications where yellow-green indication is acceptable as visual alternative to pure green.

All substitute parts listed maintain MSL 1 (Unlimited) moisture sensitivity rating and EAR99 export classification consistent with the original component.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace 3GDL-201 with LTL-4231 without circuit modification?

A: LTL-4231 operates at the same 2.1V forward voltage as 3GDL-201, enabling direct substitution in most through-hole applications. The 10mA test current versus 2mA original specification requires verification that the driving circuit can supply adequate current. The increased brightness (12.6mcd versus 2mcd) may require optical diffusion adjustment if the original design relied on low brightness for specific visual indication purposes.

Q2: What is the difference between HLMP-1790 and HLMP-1790-A0002?

A: Both parts are electrically and mechanically identical. HLMP-1790-A0002 is packaged in cut tape (CT) format, while HLMP-1790 is supplied in bulk packaging. Selection depends on assembly process requirements. Electrical specifications, brightness, wavelength, and physical dimensions are identical.

Q3: Why does 3GC-201-S have a clear lens instead of diffused?

A: 3GC-201-S is a variant within the Bivar 3GC series designed for higher brightness applications (40mcd versus 2mcd). The clear lens provides concentrated light output with narrower viewing angle (20° versus 35°), suitable for applications requiring bright, focused indication. The diffused variant 3GDL-201 distributes light over a wider area for general indication purposes.

Q4: Can I use HLMP-1640 or HLMP-1641 as direct replacements?

A: HLMP-1640 and HLMP-1641 require circuit redesign due to different forward voltage ratings (5V and 12V respectively versus 2.1V original). These parts are suitable only for applications where the driving circuit can be modified to accommodate the higher voltage requirement. Direct socket substitution without circuit modification will result in component failure or inadequate brightness.

Q5: Is 264-7SYGD/S530-E2 compatible with applications requiring pure green indication?

A: 264-7SYGD/S530-E2 produces yellow-green indication (573nm dominant wavelength) rather than pure green (568nm). This part is suitable only for applications where yellow-green visual indication is acceptable as an alternative. If the original design requires specific green wavelength for color-coded indication systems, this part is not compatible.

Q6: What is the significance of ROHS3 compliance and REACH status?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements for lead-free manufacturing. REACH affected designation indicates the part contains substances of very high concern requiring additional documentation for European Union supply. REACH unaffected parts require no additional REACH compliance documentation. Selection depends on regulatory requirements of the end application region.

Q7: How do viewing angles affect substitution compatibility?

A: Viewing angle determines the cone of light distribution. The original 3GDL-201 specifies 35° viewing angle. Substitutes with wider angles (50°, 60°) distribute light over larger areas, suitable for general indication. Narrower angles (20°) concentrate light for focused indication. Selection depends on the original application's visual indication requirements and observer positioning.

Q8: Can I use HLMP-1640-B00A1 or HLMP-1640-B00A2 as substitutes?

A: These parts feature right-angle mounting configuration versus the original radial through-hole mounting. Mechanical compatibility requires PCB layout modification to accommodate the different mounting orientation. Electrical specifications (5V, 10mA, 1.6mcd) remain identical to HLMP-1640. Use only if PCB design permits right-angle component orientation.

Q9: What does "T-1" designation mean for lens size?

A: T-1 is a standard industry designation for 3mm diameter LED lens form factor. All substitute parts listed maintain T-1 (3mm) lens size, ensuring mechanical compatibility with standard through-hole PCB footprints and mechanical housings designed for 3mm LEDs.

Q10: Why is 151031VS06000 from Würth Elektronik listed as a substitute despite 2.2V forward voltage?

A: 151031VS06000 operates at 2.2V, which falls within the acceptable 2.0V to 2.2V substitution range for the 2.1V original specification. The 0.1V difference is within typical LED forward voltage tolerance and requires minimal circuit adjustment. The part maintains diffused green lens, 3mm T-1 form factor, and active product status, making it a compatible alternative for applications with flexible voltage tolerance.

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