TLHP4401 Equivalent & Substitute Parts

Part Overview

The TLHP4401 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 3mcd brightness rating and 560nm dominant wavelength. The TLHP4401 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLHP4401
Manufacturer	Vishay Semiconductor Opto Division
Product Status	Obsolete
Color	Green
Lens Transparency	Diffused
Lens Size	3mm, T-1
Voltage - Forward (Vf) (Typ)	2.4V
Current - Test	10mA
Millicandela Rating	3mcd
Viewing Angle	60°
Mounting Type	Through Hole
Wavelength - Dominant	560nm
Height (Max)	6.10mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TLHP4401 is determined by the following critical parameters:

Color: Green LED indication
Lens Transparency: Diffused optical characteristic
Lens Size: 3mm, T-1 form factor
Mounting Type: Through-hole radial configuration
Voltage - Forward (Vf): 2.4V nominal operation
Current - Test: 10mA test current
Viewing Angle: 60° standard viewing angle
Wavelength Range: Green spectrum (560-575nm dominant wavelength)
Height Constraint: Maximum 6.10mm

Substitute parts are grouped into two categories:

Category 1: Direct Vishay Equivalents (Active Status) TLHG4400, TLHG4401, and TLHG4405 are active production alternatives from the same manufacturer within the TLH.44 series. These parts maintain identical mechanical form factor, forward voltage, test current, and viewing angle specifications. Brightness ratings vary (13mcd to 15mcd) but operate within compatible parameters for indication applications.

Category 2: Cross-Manufacturer Alternatives Parts from Everlight Electronics, Bivar Inc., and Dialight provide functional equivalence through matching green color, diffused lens, 3mm T-1 form factor, and through-hole mounting. These alternatives accommodate variations in forward voltage (1.9V to 7.5V), test current (2mA to 20mA), and brightness ratings while maintaining mechanical and optical compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Color	Lens Transparency	Lens Size	Vf (Typ)	Current - Test	Millicandela Rating	Viewing Angle	Wavelength - Dominant	Height (Max)	RoHS Status
TLHP4401	Vishay	Obsolete	Green	Diffused	3mm, T-1	2.4V	10mA	3mcd	60°	560nm	6.10mm	ROHS3 Compliant
TLHG4400	Vishay	Active	Green	Diffused	3mm, T-1	2.4V	10mA	13mcd	60°	569nm	6.10mm	ROHS3 Compliant
TLHG4401	Vishay	Active	Green	Diffused	3mm, T-1	2.4V	10mA	14mcd	60°	569nm	6.10mm	ROHS3 Compliant
TLHG4405	Vishay	Active	Green	Diffused	3mm, T-1	2.4V	10mA	15mcd	60°	569nm	6.10mm	ROHS3 Compliant
264-7SYGD/S530-E2	Everlight	Active	Yellow-Green	Diffused	2.90mm Dia	2V	20mA	50mcd	60°	573nm	6.20mm	ROHS3 Compliant
3GD-F	Bivar	Active	Green	Diffused	3mm, T-1	2.1V	20mA	25mcd	35°	568nm	5.30mm	ROHS3 Compliant
3GDL-F	Bivar	Active	Green	Diffused	3mm, T-1	2.1V	2mA	4mcd	35°	568nm	5.30mm	ROHS3 Compliant
414SYGD/S530-E2	Everlight	Active	Yellow-Green	Diffused	3.00mm Dia	2V	20mA	12.5mcd	140°	573nm	7.00mm	ROHS3 Compliant
5219323F	Dialight	Active	Green	Diffused	3.00mm Dia	7.5V	10mA	19mcd	60°	565nm	5.86mm	ROHS3 Compliant
5219326F	Dialight	Active	Green	Diffused	3.00mm Dia	1.9V	2mA	1.6mcd	60°	565nm	5.86mm	ROHS3 Compliant
5219430F	Dialight	Active	Green	Clear	2.90mm Dia	2.1V	10mA	50mcd	45°	565nm	5.89mm	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: TLHG4400, TLHG4401, or TLHG4405

These Vishay parts are the preferred substitutes for TLHP4401. All three maintain active product status, identical forward voltage (2.4V), test current (10mA), viewing angle (60°), and mechanical form factor (3mm T-1, 6.10mm height). The brightness increase (13-15mcd versus 3mcd) provides enhanced visibility while remaining compatible with standard current-limiting resistor designs. All parts are ROHS3 compliant with unlimited moisture sensitivity rating.

Secondary Recommendations: Cross-Manufacturer Alternatives

When Vishay parts are unavailable, cross-manufacturer alternatives provide functional substitution with design considerations:

Bivar 3GD-F or 3GDL-F: Maintain green color and diffused lens with 3mm T-1 form factor. Forward voltage is lower (2.1V), requiring circuit recalculation. Viewing angle is narrower (35° versus 60°). Height is reduced (5.30mm). Select 3GD-F for higher brightness (25mcd) or 3GDL-F for low-current operation (2mA).
Everlight 264-7SYGD/S530-E2: Yellow-green color (573nm) with higher brightness (50mcd). Forward voltage is lower (2V). Slightly larger height (6.20mm). Suitable for applications where color shift is acceptable.
Dialight 5219323F: Green color with 60° viewing angle matching TLHP4401. Forward voltage is significantly higher (7.5V), requiring circuit redesign. Brightness is 19mcd. Height is 5.86mm.

All substitute parts carry ROHS3 compliance and unlimited moisture sensitivity rating, matching the original part's environmental specifications.

Frequently Asked Questions (FAQ)

Q: Can TLHG4400, TLHG4401, and TLHG4405 be used interchangeably with TLHP4401?

A: Yes. These three Vishay parts are direct functional equivalents. They share identical forward voltage (2.4V), test current (10mA), viewing angle (60°), and mechanical dimensions (3mm T-1, 6.10mm height). The brightness difference (13-15mcd versus 3mcd) is an improvement for indication applications and does not require circuit modification if the original design used standard current-limiting resistors.

Q: What is the primary difference between TLHG4400, TLHG4401, and TLHG4405?

A: The three parts differ only in brightness rating: TLHG4400 provides 13mcd, TLHG4401 provides 14mcd, and TLHG4405 provides 15mcd. All other electrical and mechanical parameters are identical. Selection depends on desired brightness for the specific application.

Q: Can I use Bivar 3GD-F as a substitute for TLHP4401?

A: Bivar 3GD-F is mechanically compatible (3mm T-1 form factor, green diffused lens) but requires circuit evaluation. Forward voltage is lower (2.1V versus 2.4V), and viewing angle is narrower (35° versus 60°). Brightness is higher (25mcd). Recalculate current-limiting resistor values to account for the lower forward voltage.

Q: Why do some substitute parts have different forward voltages?

A: Forward voltage varies by LED semiconductor material and design. Parts with lower forward voltage (1.9V to 2.1V) use different chip technology than the original 2.4V design. Parts with higher forward voltage (7.5V) are designed for different application circuits. Circuit redesign is necessary when forward voltage differs significantly from the original specification.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the environmental compliance of TLHP4401. All parts also carry unlimited moisture sensitivity rating (MSL 1).

Q: What is the difference between diffused and clear lens transparency?

A: Diffused lenses scatter light over a wider area, providing softer illumination suitable for indication applications. Clear lenses concentrate light in a narrower beam with higher intensity. TLHP4401 uses diffused transparency. Dialight 5219430F offers clear lens as an alternative for applications requiring concentrated light output.

Q: Can I use yellow-green LEDs (Everlight 264-7SYGD/S530-E2) as a substitute for green LEDs?

A: Yellow-green LEDs (573nm dominant wavelength) are visually distinct from green LEDs (560nm). Use only if the application permits color variation. The Everlight part offers higher brightness (50mcd) and lower forward voltage (2V) but requires circuit recalculation and may not meet color-specific design requirements.

Q: What mounting considerations apply to these substitute parts?

A: All listed parts use through-hole radial mounting compatible with standard PCB hole spacing. Mechanical dimensions vary slightly (height ranges from 5.30mm to 7.00mm). Verify PCB clearance and component spacing before substitution, particularly when height differs from the original 6.10mm specification.

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