TLHF4400 Equivalent & Substitute Parts

Part Overview

The TLHF4400 is an orange diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for LED indication applications. Specified at 1.9V forward voltage with 40mcd brightness and a 605nm dominant wavelength, this component operates at 20mA test current with a 60° viewing angle. The part is classified as obsolete, necessitating identification of active substitute components that maintain functional compatibility within system designs.

Key Parameters

Parameter	TLHF4400 Value
Color	Orange
Lens Size	3mm, T-1
Lens Transparency	Diffused
Lens Style	Round with Domed Top
Mounting Type	Through Hole
Package / Case	Radial
Voltage - Forward (Vf) (Typ)	1.9V
Current - Test	20mA
Millicandela Rating	40mcd
Wavelength - Dominant	605nm
Viewing Angle	60°
Height (Max)	6.10mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TLHF4400 is determined by the following critical parameters:

Primary Compatibility Criteria:

Lens size: 3mm, T-1 form factor
Mounting type: Through hole radial configuration
Lens transparency: Diffused
Voltage - Forward (Vf): 1.9V to 2.0V range
Current - Test: 20mA nominal operation
RoHS3 compliance and MSL 1 rating

Substitution Logic: The TLHF4400 is an obsolete orange LED. Direct orange substitutes with matching electrical and mechanical parameters are limited. The primary direct substitute is TLHF4601 (Vishay, active status, orange, 2V, 83mcd). Additional substitutes listed represent alternative color options (yellow) that may be functionally acceptable depending on application requirements, as they maintain the same T-1 form factor, through-hole mounting, diffused lens, and comparable voltage/current specifications.

Parameter Comparison

Parameter	TLHF4400	TLHF4601	1254-10UYD/S530-A3	264-7UYD/S530-A3	3YD-F	414-10UYD/S530-A3	HLMP-1620	HLMP-1621	HLMP-1719
Manufacturer	Vishay	Vishay	Everlight	Everlight	Bivar	Everlight	Broadcom	Broadcom	Broadcom
Color	Orange	Orange	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow
Lens Size	3mm, T-1	3mm, T-1	3.00mm Dia	2.90mm Dia	3mm, T-1	3.00mm Dia	3mm, T-1	3mm, T-1	3mm, T-1
Lens Transparency	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused
Lens Style	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Flat Top	Round with Domed Top	Round with Domed Top	Round with Domed Top
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial
Voltage - Forward (Vf) (Typ)	1.9V	2V	2V	2V	2V	2V	5V	12V	1.8V
Current - Test	20mA	20mA	20mA	20mA	20mA	20mA	10mA	13mA	2mA
Millicandela Rating	40mcd	83mcd	200mcd	125mcd	20mcd	40mcd	2.2mcd	2.2mcd	2.1mcd
Viewing Angle	60°	120°	30°	60°	35°	120°	60°	60°	50°
Height (Max)	6.10mm	6.10mm	5.20mm	6.20mm	5.30mm	7.00mm	6.35mm	6.35mm	6.35mm
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute - Direct Orange Replacement: TLHF4601 (Vishay Semiconductor Opto Division) is the recommended direct substitute. It maintains orange color, T-1 form factor, through-hole radial mounting, and diffused lens characteristics. Forward voltage increases from 1.9V to 2V, and brightness increases to 83mcd with expanded 120° viewing angle. Product status is active with full RoHS3 compliance and MSL 1 rating. This part is suitable for direct PCB replacement where orange indication is required.

Alternative Substitutes - Yellow Color Options: When color substitution from orange to yellow is acceptable, the following active parts provide functional equivalence:

1254-10UYD/S530-A3 (Everlight): 2V, 200mcd, 30° viewing angle, 3.00mm diameter, 5.20mm height
264-7UYD/S530-A3 (Everlight): 2V, 125mcd, 60° viewing angle, 2.90mm diameter, 6.20mm height
3YD-F (Bivar): 2V, 20mcd, 35° viewing angle, T-1 form factor, 5.30mm height
414-10UYD/S530-A3 (Everlight): 2V, 40mcd, 120° viewing angle, flat-top lens, 7.00mm height

Low-Voltage Alternative: HLMP-1719 (Broadcom Limited) operates at 1.8V forward voltage with 2mA test current, providing the closest voltage match to the original TLHF4400. This part is yellow, T-1 form factor, and suitable for low-power indication applications.

High-Voltage Alternatives: HLMP-1620 (5V) and HLMP-1621 (12V) are available for applications requiring higher supply voltages. Both maintain T-1 form factor and diffused yellow lens characteristics.

All substitute parts listed are RoHS3 compliant with MSL 1 rating, ensuring regulatory and environmental compatibility with the original TLHF4400 specification.

Frequently Asked Questions (FAQ)

Q: Can TLHF4601 be used as a direct replacement for TLHF4400? A: Yes. TLHF4601 maintains the same orange color, 3mm T-1 form factor, through-hole radial mounting, and diffused lens. The forward voltage increases from 1.9V to 2V, which is compatible with most circuit designs. Brightness increases to 83mcd with a wider 120° viewing angle.

Q: What is the primary reason for substituting TLHF4400? A: TLHF4400 is classified as obsolete. TLHF4601 is the active equivalent from the same manufacturer, ensuring design continuity and supply chain reliability.

Q: Are yellow LED substitutes compatible with orange LED applications? A: Yellow substitutes are mechanically and electrically compatible (same form factor, voltage, current, and mounting type) but produce different colored light output. Substitution is acceptable only if the application does not require specific orange wavelength indication.

Q: What are the key parameters that determine LED substitutability? A: Critical parameters include lens size (3mm T-1), mounting type (through hole radial), lens transparency (diffused), forward voltage (1.9V to 2V range), test current (20mA nominal), and package configuration (radial). Height and viewing angle variations are acceptable within typical application tolerances.

Q: Does HLMP-1719 provide a better voltage match than TLHF4601? A: HLMP-1719 operates at 1.8V, which is closer to the original 1.9V specification. However, it is yellow rather than orange and operates at significantly lower current (2mA vs. 20mA) and brightness (2.1mcd vs. 40mcd). Selection depends on application requirements for color, brightness, and current consumption.

Q: Are all listed substitutes RoHS3 compliant? A: Yes. All substitute parts listed are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory compliance of the original TLHF4400.

Q: What is the difference between domed-top and flat-top lens styles? A: Domed-top lenses provide slightly different light distribution characteristics compared to flat-top designs. Both are diffused and suitable for general indication applications. The 414-10UYD/S530-A3 features a flat-top lens while most other substitutes use domed-top configuration.

Q: Can I use HLMP-1620 or HLMP-1621 in a circuit designed for 1.9V operation? A: No. HLMP-1620 requires 5V and HLMP-1621 requires 12V forward voltage. These parts are suitable only for applications with corresponding supply voltages. Circuit redesign would be required for substitution.

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