TLHO4400 Equivalent & Substitute Parts

Part Overview

The TLHO4400 is an orange diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division. This discrete indicator LED operates at 2.4V forward voltage with a 13mcd brightness rating and 605nm dominant wavelength. The part is Active status and ROHS3 compliant. Substitute parts are identified when equivalent optical, electrical, and mechanical characteristics are required for circuit redesign, component obsolescence management, or supply chain optimization.

Key Parameters

Parameter	TLHO4400 Value
Color	Orange
Wavelength - Dominant	605nm
Lens Transparency	Diffused
Lens Size	3mm, T-1
Voltage - Forward (Vf) (Typ)	2.4V
Current - Test	10mA
Millicandela Rating	13mcd
Viewing Angle	60°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	6.10mm
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the TLHO4400 are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Color: Orange (605nm wavelength range)
Lens Transparency: Diffused
Lens Size: 3mm T-1 form factor
Mounting Type: Through Hole Radial
Voltage - Forward (Vf): 2.1V to 2.4V range
Current - Test: 10mA nominal operation
Viewing Angle: 40° to 60°

Secondary Considerations:

Millicandela Rating: 5.6mcd to 680mcd (brightness variations acceptable based on application requirements)
Height: 5.60mm to 6.55mm (PCB clearance compatibility)
RoHS and REACH compliance status

The substitute parts identified include orange diffused T-1 LEDs from Lite-On Inc. and Rohm Semiconductor that meet the primary matching criteria within acceptable electrical and mechanical tolerances.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Color	Wavelength (nm)	Lens Transparency	Lens Size	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Height (Max)	RoHS Status
TLHO4400	Vishay Semiconductor Opto Division	Orange	605	Diffused	3mm, T-1	2.4V	10mA	13	60°	6.10mm	ROHS3 Compliant
LTL-4251	Lite-On Inc.	Yellow	588	Diffused	3mm, T-1	2.1V	10mA	8.7	40°	6.55mm	ROHS3 Compliant
LTL-4251N	Lite-On Inc.	Yellow	588	Diffused	3mm, T-1	2.1V	10mA	5.6	60°	5.85mm	ROHS3 Compliant
SLI-343D8U3F	Rohm Semiconductor	Orange	605	Diffused	3.10mm Dia	2.2V	20mA	470	40°	5.60mm	ROHS3 Compliant
SLI-343Y8C3F	Rohm Semiconductor	Yellow	590	Clear	3.10mm Dia	2.2V	20mA	680	40°	5.60mm	ROHS3 Compliant

Engineering Selection Recommendations

Orange Diffused T-1 Direct Substitutes:

The SLI-343D8U3F from Rohm Semiconductor (EXCELED™ series) provides the closest functional match to the TLHO4400. Both parts feature orange color at 605nm wavelength with diffused lens transparency and T-1 form factor. The SLI-343D8U3F operates at 2.2V forward voltage with 20mA test current and delivers 470mcd brightness. This part is ROHS3 compliant and Active status. The higher brightness rating and increased test current require circuit design verification for current-limiting resistor adjustment.

Alternative Orange Options:

The SLI-343D8C3F (clear lens variant) operates at identical electrical specifications (2.2V, 20mA) with 680mcd brightness. Selection between diffused and clear lens variants depends on application requirements for light diffusion versus directional intensity.

Yellow Diffused Alternatives:

The LTL-4251N from Lite-On Inc. provides a yellow diffused T-1 substitute with 2.1V forward voltage and 10mA test current, matching the TLHO4400 electrical profile. This part delivers 5.6mcd brightness with 60° viewing angle and is ROHS3 compliant with Active status. The LTL-4251 variant offers higher brightness (8.7mcd) at the same electrical specifications but with narrower 40° viewing angle.

Compliance Status:

All identified substitute parts maintain ROHS3 compliance and Active product status. The LTL-4251 carries REACH Affected designation, while all other parts are REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can the SLI-343D8U3F directly replace the TLHO4400 without circuit modification?

A: The SLI-343D8U3F shares identical color (orange), wavelength (605nm), and form factor (T-1 diffused) with the TLHO4400. However, the forward voltage differs (2.2V vs. 2.4V) and test current is doubled (20mA vs. 10mA). Circuit redesign of the current-limiting resistor is required to maintain proper LED operation and prevent overcurrent conditions.

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

A: Diffused lens variants scatter light over a wider area with reduced intensity concentration, suitable for general indication applications. Clear lens variants concentrate light in a narrower beam with higher intensity. The TLHO4400 uses diffused lens technology; substitutes should maintain this characteristic unless application requirements change.

Q: Are yellow LED substitutes compatible with orange LED circuits?

A: Yellow LEDs (588-590nm wavelength) differ optically from orange LEDs (605nm wavelength) and produce visually distinct colors. Electrical parameters (forward voltage, test current) may also differ. Yellow substitutes are acceptable only if the application permits color change and circuit parameters are adjusted accordingly.

Q: What is the significance of the T-1 form factor?

A: T-1 designates a 3mm diameter through-hole LED package with standard radial lead configuration. This form factor ensures mechanical compatibility with standard PCB mounting holes and component spacing. Substitutes must maintain T-1 form factor for direct PCB compatibility without redesign.

Q: How do millicandela ratings affect substitute selection?

A: Millicandela (mcd) rating indicates LED brightness at the specified test current. The TLHO4400 delivers 13mcd. Substitute parts range from 5.6mcd to 680mcd. Higher brightness may cause excessive visual intensity; lower brightness may reduce visibility. Selection depends on application requirements for indicator visibility and power budget constraints.

Q: What does ROHS3 compliance mean for component substitution?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the part meets European environmental standards restricting lead, mercury, cadmium, and other hazardous materials. All identified substitutes maintain ROHS3 compliance, ensuring regulatory equivalence for applications requiring environmental compliance.

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