TLHY5400 Yellow LED T-1 3/4 Through-Hole Equivalent & Substitute Parts

Part Overview

The TLHY5400 is a yellow diffused LED manufactured by Vishay Semiconductor Opto Division, designed for indication applications in through-hole mounting configurations. This T-1 3/4 (5mm) package LED operates at 2.4V forward voltage with 10mcd luminous intensity and a 60° viewing angle. The part is currently active in production and ROHS3 compliant.

Equivalent and substitute parts are necessary when the TLHY5400 reaches end-of-life status, when inventory constraints occur, or when design requirements necessitate alternative electrical or optical characteristics within the yellow LED indication category.

Key Parameters

Parameter	TLHY5400 Value	Substitution Relevance
Color	Yellow	Critical - must match for visual indication consistency
Lens Transparency	Diffused	Critical - affects light distribution pattern
Lens Size / Package	5mm, T-1 3/4	Critical - determines mechanical fit in PCB and housing
Mounting Type	Through Hole	Critical - establishes board assembly compatibility
Voltage - Forward (Vf) Typical	2.4V	Important - affects circuit design and current limiting resistor selection
Current - Test	10mA	Important - establishes nominal operating point
Millicandela Rating	10mcd	Important - determines brightness for indication visibility
Viewing Angle	60°	Important - affects visibility range in application
Wavelength - Dominant	588nm	Important - defines yellow color perception
Height (Max)	12.80mm	Important - affects mechanical clearance in enclosure
RoHS Status	ROHS3 Compliant	Important - regulatory compliance requirement

Substitute Part Grouping Explanation

Substitution logic for the TLHY5400 is based on the following allowed parameters:

Critical Matching Parameters:

Color: Yellow (588-590nm dominant wavelength range)
Lens Transparency: Diffused
Lens Size: 5mm, T-1 3/4 package
Mounting Type: Through Hole
Package / Case: Radial

Flexible Parameters (within acceptable ranges):

Voltage - Forward (Vf): 2.0V to 2.4V (circuit design accommodates this range)
Current - Test: 10mA to 20mA (standard indication current levels)
Millicandela Rating: 10mcd to 30mcd (brightness variation acceptable for indication function)
Viewing Angle: 24° to 70° (application-dependent visibility requirement)
Height (Max): 8.21mm to 12.80mm (mechanical clearance dependent)

Compliance Parameters:

RoHS Status: ROHS3 Compliant preferred
Product Status: Active or Not For New Designs acceptable; Obsolete parts listed with inventory status

Substitute parts must maintain yellow color in the 585-590nm wavelength range, diffused lens transparency, 5mm T-1 3/4 through-hole configuration, and radial package type to ensure direct mechanical and electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Color	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Wavelength - Dominant	Height (Max)	Product Status	RoHS Status
TLHY5400	Vishay	Yellow	2.4V	10mA	10mcd	60°	588nm	12.80mm	Active	ROHS3
TLHY5401	Vishay	Yellow	2.4V	10mA	12mcd	60°	588nm	12.80mm	Active	ROHS3
5219673F	Dialight	Yellow	2.1V	20mA	12.6mcd	60°	588nm	8.21mm	Active	ROHS3
LTL-307Y	Lite-On Inc.	Yellow	2.1V	20mA	29mcd	50°	590nm	8.60mm	Active	REACH Affected
MV5354A	onsemi	Yellow	2.1V	20mA	25mcd	24°	-	8.89mm	Obsolete	REACH Unaffected
MV6351	onsemi	Yellow	2.2V	20mA	12mcd	70°	-	8.89mm	Obsolete	REACH Unaffected
MV6353	onsemi	Yellow	2.1V	20mA	15mcd	65°	-	8.89mm	Obsolete	REACH Unaffected
SLR-56YY3F	Rohm Semiconductor	Yellow	2.1V	10mA	16mcd	40°	587nm	8.90mm	Not For New Designs	ROHS3
SSL-LX5093LYD	Lumex Opto/Components Inc.	Yellow	2.1V	20mA	30mcd	60°	-	8.60mm	Active	ROHS3
SSL-LX5093SYD	Lumex Opto/Components Inc.	Yellow	2.1V	20mA	300mcd	60°	-	8.60mm	Active	ROHS3

Engineering Selection Recommendations

Primary Equivalent (Parametric Match): TLHY5401 is the direct parametric equivalent, manufactured by the same supplier (Vishay) with identical electrical characteristics (2.4V, 10mA test current) and mechanical package (T-1 3/4, 12.80mm height). Both parts are Active status and ROHS3 compliant. This part provides the closest functional replacement with no circuit redesign required.

Active Status Alternatives (Recommended for New Designs):

5219673F (Dialight): Active status, ROHS3 compliant. Lower forward voltage (2.1V) and higher test current (20mA) require circuit resistor recalculation. Shorter height (8.21mm) may affect mechanical fit.
LTL-307Y (Lite-On Inc.): Active status. Higher brightness (29mcd) and lower forward voltage (2.1V) require circuit redesign. REACH Affected status requires compliance verification.
SSL-LX5093LYD (Lumex): Active status, ROHS3 compliant. Higher brightness (30mcd), lower forward voltage (2.1V), and higher test current (20mA) require circuit redesign. Shorter height (8.60mm) may affect mechanical fit.

Obsolete Status Parts (Inventory Depletion Only): MV5354A, MV6351, and MV6353 (onsemi) are obsolete status. These parts are suitable only for legacy system maintenance or when existing inventory must be consumed. Forward voltage ranges from 2.1V to 2.2V; test currents are 20mA. Viewing angles vary significantly (24° to 70°), affecting application suitability.

Not For New Designs: SLR-56YY3F (Rohm Semiconductor) carries "Not For New Designs" status despite ROHS3 compliance. This part is acceptable for sustaining production of existing designs but should not be selected for new development.

Frequently Asked Questions (FAQ)

Q: Can TLHY5401 be used as a direct drop-in replacement for TLHY5400? A: Yes. TLHY5401 is manufactured by Vishay with identical forward voltage (2.4V), test current (10mA), package (T-1 3/4), and height (12.80mm). No circuit modifications are required.

Q: What circuit changes are needed if I substitute a part with 2.1V forward voltage instead of 2.4V? A: The forward voltage difference of 0.3V affects the voltage drop across the current-limiting resistor. Recalculate the series resistor value using the formula: R = (Vsupply - Vf) / Iled. A lower Vf results in higher voltage across the resistor, requiring a higher resistance value to maintain the same LED current.

Q: Why do some substitute parts have different heights (8.21mm to 12.80mm)? A: Height variation affects mechanical clearance in the PCB assembly and enclosure design. Shorter parts (8.21mm to 8.90mm) may not fit applications designed for the TLHY5400's 12.80mm height. Verify mechanical fit before substitution.

Q: Can I use SSL-LX5093SYD (300mcd) instead of TLHY5400 (10mcd)? A: Mechanically and electrically, yes. However, the 30-fold brightness increase will alter the visual indication intensity. This substitution is suitable only if the application can tolerate significantly brighter LED output or if brightness reduction is implemented through circuit design (lower test current or PWM dimming).

Q: What is the difference between ROHS3 Compliant and REACH Affected status? A: ROHS3 Compliant indicates the part meets Restriction of Hazardous Substances Directive 3 requirements. REACH Affected indicates the part is subject to REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) regulations, requiring additional compliance documentation. Both are regulatory compliance designations; REACH Affected does not indicate non-compliance but requires verification of supply chain documentation.

Q: Are obsolete parts (MV5354A, MV6351, MV6353) acceptable for production use? A: Obsolete parts are acceptable only for sustaining production of existing designs or consuming existing inventory. They should not be selected for new product development. Verify inventory availability and lead times before committing to obsolete part selection.

Q: Why do some parts list "Not For New Designs" status? A: "Not For New Designs" indicates the manufacturer is discontinuing the product line but may continue limited production for existing customers. These parts are suitable for maintaining production of established designs but should not be incorporated into new product development.

Q: Can I mix TLHY5400 and TLHY5401 in the same circuit? A: Yes. Both parts have identical electrical characteristics (2.4V, 10mA) and mechanical package. Mixing these parts in the same circuit or PCB assembly introduces no functional or compatibility issues.

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