TLHG4601 Equivalent & Substitute Parts

Part Overview

The TLHG4601 is a green diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for LED indication applications. This part operates at 2.4V forward voltage with a 4.6mcd brightness rating and 569nm dominant wavelength. The TLHG4601 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	TLHG4601 Value
Color	Green
Lens Transparency	Diffused
Lens Size	3mm, T-1
Lens Style	Round with Domed Top
Voltage - Forward (Vf) (Typ)	2.4V
Current - Test	10mA
Millicandela Rating	4.6mcd
Wavelength - Dominant	569nm
Wavelength - Peak	565nm
Viewing Angle	120°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	6.10mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the TLHG4601 is determined by the following critical parameters:

Primary Compatibility Criteria:

Color: Green
Mounting Type: Through Hole
Package / Case: Radial
Lens Transparency: Diffused
Lens Size: 3mm or equivalent
Voltage - Forward (Vf): 2.0V to 2.4V range
Wavelength - Dominant: 565nm to 573nm range

Secondary Considerations:

Millicandela Rating: 1.6mcd to 50mcd (application-dependent brightness tolerance)
Viewing Angle: 35° to 140° (application-dependent field of view requirements)
Current - Test: 2mA to 20mA (design-dependent current budget)

Substitute parts are grouped into two categories:

Category 1: Direct Parametric Equivalents (Vishay TLHG Series) TLHG4605 and TLHG4600 maintain identical mechanical form factor, wavelength, forward voltage, and mounting characteristics. These parts differ only in millicandela rating and product status (active vs. obsolete).

Category 2: Cross-Manufacturer Equivalents Parts from Würth Elektronik, Everlight Electronics, Bivar Inc., and Dialight meet the core substitution criteria (green color, diffused lens, 3mm through-hole radial package) but may vary in forward voltage, brightness, viewing angle, or test current. Selection depends on specific circuit design constraints.

Parameter Comparison

Part Number	Manufacturer	Color	Vf (Typ)	mcd Rating	Wavelength - Dominant	Viewing Angle	Current - Test	Height (Max)	Product Status
TLHG4601	Vishay	Green	2.4V	4.6mcd	569nm	120°	10mA	6.10mm	Obsolete
TLHG4605	Vishay	Green	2.4V	6mcd	569nm	120°	10mA	6.10mm	Active
TLHG4600	Vishay	Green	2.4V	4mcd	569nm	120°	10mA	6.10mm	Active
151031VS06000	Würth Elektronik	Green	2.2V	30mcd	568nm	60°	20mA	5.55mm	Active
264-7SYGD/S530-E2	Everlight Electronics	Yellow-Green	2V	50mcd	573nm	60°	20mA	6.20mm	Active
3GD-F	Bivar Inc.	Green	2.1V	25mcd	568nm	35°	20mA	5.30mm	Active
3GDL-F	Bivar Inc.	Green	2.1V	4mcd	568nm	35°	2mA	5.30mm	Active
414SYGD/S530-E2	Everlight Electronics	Yellow-Green	2V	12.5mcd	573nm	140°	20mA	7.00mm	Active
5219323F	Dialight	Green	7.5V	19mcd	565nm	60°	10mA	5.86mm	Active
5219326F	Dialight	Green	1.9V	1.6mcd	565nm	60°	2mA	5.86mm	Active
5219430F	Dialight	Green	2.1V	50mcd	565nm	45°	10mA	5.89mm	Active

Engineering Selection Recommendations

Recommended Primary Substitutes:

TLHG4605 and TLHG4600 are the preferred substitutes for the TLHG4601. Both parts are manufactured by Vishay Semiconductor Opto Division and maintain identical electrical and mechanical specifications except for brightness rating. TLHG4605 (6mcd) provides higher brightness, while TLHG4600 (4mcd) offers closer brightness matching to the original 4.6mcd specification. Both parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating.

Cross-Manufacturer Alternatives:

When Vishay parts are unavailable, the following active products provide functional equivalence:

3GDL-F (Bivar Inc.): Matches the TLHG4601 in forward voltage (2.1V vs. 2.4V) and brightness (4mcd), with identical T-1 form factor. Suitable for low-current applications (2mA test current).
5219326F (Dialight): Provides the lowest brightness option (1.6mcd) with 1.9V forward voltage and 2mA test current, appropriate for ultra-low-power indication circuits.
151031VS06000 (Würth Elektronik): Offers higher brightness (30mcd) with slightly lower forward voltage (2.2V) and narrower viewing angle (60°), suitable for applications requiring increased visibility.

All recommended substitutes maintain ROHS3 compliance and unlimited moisture sensitivity rating, ensuring regulatory and environmental compatibility with the original TLHG4601 specification.

Frequently Asked Questions (FAQ)

Q: Can TLHG4605 directly replace TLHG4601 in existing designs?

A: Yes. TLHG4605 is a direct mechanical and electrical substitute with identical forward voltage (2.4V), wavelength (569nm), viewing angle (120°), and package form factor. The only difference is higher brightness (6mcd vs. 4.6mcd), which is acceptable in most indication applications.

Q: What is the difference between TLHG4600 and TLHG4605?

A: Both are active Vishay products with identical electrical and mechanical specifications. TLHG4600 provides 4mcd brightness, closer to the original TLHG4601 (4.6mcd), while TLHG4605 provides 6mcd. Selection depends on brightness requirements for the specific application.

Q: Can I use Everlight 264-7SYGD/S530-E2 as a substitute?

A: This part is functionally compatible but with design considerations. It operates at 2V forward voltage (vs. 2.4V), has yellow-green color (573nm vs. 569nm green), and requires 20mA test current (vs. 10mA). Circuit redesign may be necessary to accommodate these parameter differences.

Q: What is the key difference between Bivar 3GD-F and 3GDL-F?

A: Both are T-1 green diffused LEDs from Bivar with identical forward voltage (2.1V) and wavelength (568nm). The 3GD-F operates at 20mA test current with 25mcd brightness, while 3GDL-F operates at 2mA test current with 4mcd brightness. Selection depends on circuit current budget and brightness requirements.

Q: Why does Dialight 5219323F have 7.5V forward voltage?

A: The 5219323F is a high-voltage LED designed for direct connection to higher voltage supplies. This part is not recommended as a direct substitute for the TLHG4601 (2.4V) without significant circuit modification.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts listed in this document are ROHS3 compliant and carry unlimited moisture sensitivity rating (MSL 1), matching the environmental and regulatory compliance of the original TLHG4601.

Q: What viewing angle should I consider when selecting a substitute?

A: The TLHG4601 has a 120° viewing angle. Substitutes with narrower angles (35° to 60°) concentrate light intensity but reduce peripheral visibility. Substitutes with wider angles (140°) provide broader visibility but lower peak intensity. Select based on application requirements for light distribution.

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