TLLR5401 Equivalent & Substitute Parts

Part Overview

The TLLR5401 is a red diffused T-1 3/4 through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for indication applications. This part is currently active in production with 4070 units in stock. The TLLR5401 operates at 1.9V forward voltage with a 2mA test current, delivering 2 millicandela output with a 50° viewing angle and 619nm dominant wavelength. Substitute parts are necessary when the original TLLR5401 becomes unavailable, when alternative electrical characteristics better match circuit requirements, or when supply chain constraints require qualified alternatives.

Key Parameters

Parameter	TLLR5401 Value
Manufacturer	Vishay Semiconductor Opto Division
Color	Red
Lens Transparency	Diffused
Mounting Type	Through Hole
Package / Case	Radial
Supplier Device Package	T-1 3/4
Voltage - Forward (Vf) (Typ)	1.9V
Current - Test	2mA
Millicandela Rating	2mcd
Wavelength - Dominant	619nm
Viewing Angle	50°
Height (Max)	12.80mm
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution of the TLLR5401 is determined by the following critical parameters:

Primary Compatibility Criteria:

Mounting Type: Through Hole (required for PCB assembly compatibility)
Package / Case: Radial (required for lead configuration and spacing)
Color: Red (required for visual indication function)
Lens Transparency: Diffused (required for light distribution characteristics)

Secondary Electrical Criteria:

Voltage - Forward (Vf): Range 1.6V to 2.1V (acceptable tolerance for series resistor adjustment)
Current - Test: Range 2mA to 20mA (acceptable for circuit design flexibility)
Millicandela Rating: 0.4mcd to 70mcd (acceptable based on application brightness requirements)
Wavelength - Dominant: 619nm to 657nm (acceptable within red spectrum for indication)
Viewing Angle: 36° to 65° (acceptable for typical indication applications)

Compliance Requirements:

RoHS Status: ROHS3 Compliant (mandatory for regulatory compliance)
Product Status: Active or Obsolete (both acceptable; obsolete parts require inventory verification)

Substitute parts must satisfy all primary compatibility criteria and operate within the secondary electrical parameter ranges. Parts that deviate from these specifications require circuit redesign and are not direct substitutes.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Current - Test	mcd	Wavelength - Dominant	Viewing Angle	Height (Max)	Product Status	RoHS Status
TLLR5401	Vishay	1.9V	2mA	2	619nm	50°	12.80mm	Active	ROHS3
5219240F	Dialight	—	10mA	6.3	—	—	8.94mm	Active	ROHS3
5219672F	Dialight	2V	20mA	60	623nm	60°	8.21mm	Active	ROHS3
HLMP-3600-D00B2	Broadcom Limited	—	10mA	2.1	635nm	60°	—	Active	ROHS3
HLMP-D101	Broadcom Limited	1.8V	20mA	70	637nm	65°	9.19mm	Active	ROHS3
HLMP-D150	onsemi	—	—	—	—	—	—	Obsolete	ROHS3
LTL-10223W	Lite-On Inc.	2V	10mA	60	623nm	60°	7.20mm	Active	ROHS3
LTL-307P	Lite-On Inc.	2.1V	20mA	5.6	657nm	50°	8.60mm	Active	ROHS3
LTL-4223	Lite-On Inc.	2V	10mA	19	623nm	36°	8.60mm	Active	ROHS3
MV50154	Fairchild Semiconductor	1.6V	10mA	1.5	—	50°	6.35mm	Active	ROHS3
MV5025A	onsemi	1.65V	20mA	0.4	—	180°	11.98mm	Obsolete	ROHS3

Engineering Selection Recommendations

All listed substitute parts meet ROHS3 compliance and are suitable for applications requiring red diffused through-hole LEDs in radial packages. Selection among active parts should prioritize current availability and supply chain stability.

Active Status Parts (Recommended Primary Selection):

5219240F, 5219672F, HLMP-3600-D00B2, HLMP-D101, LTL-10223W, LTL-307P, LTL-4223, MV50154 are currently in production with confirmed inventory levels.

Obsolete Status Parts (Secondary Selection):

HLMP-D150 and MV5025A are obsolete but may be available from legacy inventory. Use only when active alternatives are exhausted and inventory verification confirms availability.

All substitute parts operate within acceptable electrical parameter ranges for standard indication applications and maintain compatibility with through-hole PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can TLLR5401 substitutes be used interchangeably without circuit modification?

A: Substitutes within the specified voltage range (1.6V to 2.1V) and current range (2mA to 20mA) can be used with series resistor adjustment. Parts with significantly different forward voltage or current ratings may require resistor recalculation to maintain proper LED operation and brightness.

Q: What is the difference between T-1 3/4 and 5mm package designations?

A: T-1 3/4 and 5mm refer to the same through-hole LED package format with approximately 5mm lens diameter. Both designations are acceptable for mechanical and electrical compatibility with TLLR5401 applications.

Q: Are obsolete parts acceptable for new designs?

A: Obsolete parts such as HLMP-D150 and MV5025A should not be used in new designs. These parts are suitable only for legacy system repairs or maintenance when active alternatives are unavailable and inventory can be confirmed.

Q: How do millicandela ratings affect substitution?

A: Millicandela rating determines LED brightness. The TLLR5401 operates at 2mcd. Substitutes with higher ratings (up to 70mcd) provide increased brightness and may require series resistor adjustment to prevent over-current. Substitutes with lower ratings provide reduced brightness and may require circuit redesign for adequate visibility.

Q: What viewing angle considerations apply to substitution?

A: The TLLR5401 has a 50° viewing angle. Substitutes with narrower angles (36°) concentrate light in a smaller cone; substitutes with wider angles (65°) distribute light over a broader area. Selection depends on application requirements for light distribution and visibility from different viewing positions.

Q: Are all substitute parts REACH compliant?

A: All listed parts have REACH status of either REACH Unaffected or REACH Affected. Verify specific REACH compliance requirements with your regulatory or procurement department before final part selection.

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