TLLG5401 Equivalent & Substitute Parts

Part Overview

The TLLG5401 is a green diffused T-1 3/4 through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for LED indication applications. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The TLLG5401 operates at 1.9V forward voltage with a 2mA test current and delivers 2 millicandela brightness at 569nm dominant wavelength.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLLG5401
Manufacturer	Vishay Semiconductor Opto Division
Color	Green
Lens Transparency	Diffused
Lens Style	Round with Domed Top
Lens Size	5.80mm Dia
Voltage - Forward (Vf) Typical	1.9V
Current - Test	2mA
Millicandela Rating	2mcd
Viewing Angle	50°
Wavelength - Dominant	569nm
Wavelength - Peak	565nm
Mounting Type	Through Hole
Package / Case	Radial
Supplier Device Package	T-1 3/4
Height (Max)	12.80mm
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the TLLG5401 are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Color: Green or Yellow-Green
Lens Transparency: Diffused
Mounting Type: Through Hole
Package Type: Radial configuration
Wavelength Range: 565nm to 575nm (peak and dominant)
Lens Style: Round with Domed Top

Secondary Compatibility Factors:

Forward Voltage (Vf): 1.8V to 2.1V range
Test Current: 2mA to 20mA
Millicandela Rating: 1.6mcd to 200mcd
Viewing Angle: 25° to 90°
Height: 6.30mm to 12.80mm

Substitutes are classified into two groups: direct mechanical and electrical equivalents (T-1 3/4 package format with similar electrical characteristics), and functional alternatives (5mm round package with compatible optical and electrical properties).

Parameter Comparison

Part Number	Manufacturer	Color	Vf (Typ)	Test Current	mcd	Wavelength - Dominant	Viewing Angle	Lens Size	Height (Max)	Product Status
TLLG5401	Vishay	Green	1.9V	2mA	2	569nm	50°	5.80mm	12.80mm	Obsolete
1383SYGD/S530-E2	Everlight	Yellow-Green	2V	20mA	200	573nm	25°	5.00mm	8.90mm	Active
151051VS04000	Würth Elektronik	Green	2.1V	20mA	140	572nm	40°	4.90mm	8.95mm	Active
323-2SYGD/S530-E2	Everlight	Yellow-Green	2V	20mA	80	573nm	60°	4.70mm	6.30mm	Active
336SYGSYGD/S530-E2	Everlight	Yellow-Green	2V	20mA	16	573nm	90°	5.00mm	8.90mm	Active
4300H5LC	Visual Communications Company - VCC	Green	1.8V	2mA	2.3	-	50°	5mm	8.89mm	Not For New Designs
5219674F	Dialight	Green	2.1V	20mA	40	569nm	60°	4.75mm	8.21mm	Active
HLMP-3680-B00B2	Broadcom Limited	Green	5V	10mA	1.6	565nm	60°	-	-	Active
HLMP-4740-A0002	Broadcom Limited	Green	1.9V	2mA	2.3	569nm	50°	5mm	9.19mm	Active
LTL-307G	Lite-On Inc.	Green	2.1V	20mA	19	569nm	50°	5.00mm	8.60mm
LTL-4233	Lite-On Inc.	Green	2.1V	10mA	19	569nm	36°	5mm	8.60mm	Active

Engineering Selection Recommendations

Closest Electrical and Mechanical Match: HLMP-4740-A0002 (Broadcom Limited) provides the most direct substitution for TLLG5401. Both parts share identical forward voltage (1.9V), test current (2mA), millicandela rating (2.3mcd), viewing angle (50°), and wavelength characteristics (569nm dominant, 565nm peak). The HLMP-4740-A0002 is actively produced and ROHS3 compliant with unlimited moisture sensitivity rating.

Alternative for Low-Current Applications: 4300H5LC (Visual Communications Company - VCC) offers comparable electrical performance with 1.8V forward voltage and 2mA test current. However, this part is classified as "Not For New Designs" and should be avoided for new product development.

Active Production Alternatives with Higher Brightness: For applications tolerating increased forward voltage and test current, the following active parts provide enhanced brightness:

LTL-307G and LTL-4233 (Lite-On Inc.): 2.1V forward voltage, 19mcd brightness, 569nm wavelength
5219674F (Dialight): 2.1V forward voltage, 40mcd brightness, 569nm wavelength
151051VS04000 (Würth Elektronik): 2.1V forward voltage, 140mcd brightness, 572nm wavelength

Yellow-Green Alternatives: Everlight Electronics parts (1383SYGD/S530-E2, 323-2SYGD/S530-E2, 336SYGSYGD/S530-E2) provide yellow-green color at 573nm wavelength. These are suitable only when color shift from pure green to yellow-green is acceptable in the application.

Not Recommended: HLMP-3680-B00B2 (Broadcom Limited) operates at 5V with right-angle mounting, making it incompatible with standard through-hole radial applications designed for the TLLG5401.

Frequently Asked Questions (FAQ)

Q: Can I use HLMP-4740-A0002 as a direct replacement for TLLG5401? A: Yes. Both parts share identical electrical specifications (1.9V forward voltage, 2mA test current), optical characteristics (569nm dominant wavelength, 50° viewing angle), and mechanical form factor (T-1 3/4 through-hole radial package). HLMP-4740-A0002 is actively produced and ROHS3 compliant.

Q: What is the difference between the Everlight yellow-green parts and the original green TLLG5401? A: Everlight parts (1383SYGD/S530-E2, 323-2SYGD/S530-E2, 336SYGSYGD/S530-E2) emit at 573nm wavelength (yellow-green) compared to TLLG5401's 569nm (green). These parts also operate at higher test currents (20mA) and deliver significantly higher brightness levels. Use only if your application accepts yellow-green color output.

Q: Why do some substitutes have higher forward voltage and test current than TLLG5401? A: Modern LED designs often operate at higher currents to achieve greater brightness while maintaining efficiency. Parts like LTL-307G (2.1V, 20mA) and 5219674F (2.1V, 20mA) deliver 19mcd and 40mcd respectively, compared to TLLG5401's 2mcd. Circuit design must accommodate these electrical differences through appropriate current-limiting resistors.

Q: Is HLMP-3680-B00B2 compatible with TLLG5401? A: No. HLMP-3680-B00B2 is a right-angle mounted LED operating at 5V, fundamentally different from TLLG5401's radial through-hole configuration and 1.9V operation. This part is suitable only for circuit board indicator applications with different mechanical and electrical requirements.

Q: Can I use 4300H5LC as a substitute? A: 4300H5LC offers compatible electrical specifications (1.8V forward voltage, 2mA test current) and mechanical form factor. However, this part is classified as "Not For New Designs" and should not be selected for new product development. Use HLMP-4740-A0002 instead.

Q: What viewing angle differences should I consider when selecting a substitute? A: TLLG5401 has a 50° viewing angle. Substitutes range from 25° (narrow, 1383SYGD/S530-E2) to 90° (wide, 336SYGSYGD/S530-E2). Narrower angles concentrate light intensity in a specific direction; wider angles distribute light across a broader area. Select based on your application's optical requirements.

Q: Are all recommended substitutes ROHS3 compliant? A: All active production substitutes listed are ROHS3 compliant. LTL-307G and LTL-4233 are REACH Affected, while TLLG5401 and most other substitutes are REACH Unaffected. Verify compliance requirements for your specific application and region.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message