TLHY4201 Yellow LED T-1 Through Hole - Equivalent & Substitute Parts

Part Overview

The TLHY4201 is a yellow 588nm LED indication component manufactured by Vishay Semiconductor Opto Division in a T-1 through-hole radial package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The TLHY4201 delivers 15 millicandela at 10mA test current with a 2.4V forward voltage and 44° viewing angle, designed for standard indication applications requiring yellow wavelength output.

Key Parameters

Parameter	TLHY4201 Value
Color	Yellow
Wavelength - Dominant	588nm
Wavelength - Peak	585nm
Millicandela Rating	15mcd
Voltage - Forward (Vf) Typical	2.4V
Current - Test	10mA
Viewing Angle	44°
Lens Style	Round with Domed Top
Lens Size	3mm, T-1
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	6.10mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the TLHY4201 is determined by the following critical parameters:

Color: Yellow wavelength output (587-588nm dominant wavelength range)
Package Type: T-1 through-hole radial configuration
Lens Style: Round with domed top
Mounting: Through-hole radial leads
Electrical Compatibility: Forward voltage range 1.9V to 2.4V; test current 10-20mA
Brightness Range: 15-350mcd acceptable for indication applications
Compliance: ROHS3 compliant, MSL 1 rating

Substitute parts are grouped into two categories:

Category A - Direct Replacements (Active Status, Matched Specifications) Parts with yellow color, T-1 package, similar brightness (15-30mcd), and forward voltage within 0.3V tolerance of the original.

Category B - Functional Equivalents (Active Status, Enhanced or Alternate Specifications) Parts with yellow color, T-1 package, higher brightness (180-350mcd), or slightly different electrical parameters that maintain circuit compatibility through standard current-limiting resistor adjustment.

Parameter Comparison

Part Number	Manufacturer	Color	Wavelength (nm)	Millicandela	Vf (Typ)	Test Current	Viewing Angle	Height (Max)	Product Status
TLHY4201	Vishay	Yellow	588	15mcd	2.4V	10mA	44°	6.10mm	Obsolete
TLHY4205	Vishay	Yellow	588	20mcd	2.4V	10mA	44°	6.10mm	Active
5219431F	Dialight	Yellow	—	30mcd	—	20mA	—	5.89mm	Active
HLMP-1420	Broadcom	Yellow	585	15mcd	2V	10mA	45°	6.35mm	Active
HLMP-1421	Broadcom	Yellow	585	15mcd	2V	10mA	45°	6.35mm	Active
HLMP-1421-F0002	Broadcom	Yellow	585	15mcd	2V	10mA	45°	6.35mm	Active
LTL-4252N	Lite-On	Yellow	588	19mcd	2.1V	10mA	45°	5.85mm	Active
LTL1CHJSTNN	Lite-On	Yellow	587	180mcd	2.05V	20mA	45°	5.20mm	Active
SLI-343YC3F	Rohm	Yellow	587	350mcd	1.9V	20mA	40°	5.60mm	Not For New Designs

Engineering Selection Recommendations

Primary Recommendation: TLHY4205 The TLHY4205 from Vishay is the direct successor to the TLHY4201. Both parts share identical electrical specifications (2.4V forward voltage, 10mA test current, 588nm wavelength), package configuration (T-1 radial), and compliance status (ROHS3 compliant, MSL 1). The TLHY4205 offers 20mcd brightness versus the original 15mcd, providing improved visibility margin. Active product status ensures long-term availability and supply chain stability.

Secondary Recommendation: HLMP-1420 or HLMP-1421 Broadcom HLMP-1420 and HLMP-1421 provide equivalent functionality with matched 15mcd brightness and 10mA test current. Forward voltage is 2V versus 2.4V on the original, requiring minimal circuit adjustment through standard current-limiting resistor recalculation. Both parts maintain T-1 package form factor, 45° viewing angle, and ROHS3 compliance. HLMP-1421-F0002 is the tape and reel variant of HLMP-1421 for automated assembly applications.

Alternative for High-Brightness Applications: LTL1CHJSTNN The Lite-On LTL1CHJSTNN delivers 180mcd at 20mA test current, suitable for applications requiring enhanced visibility. Forward voltage of 2.05V is compatible with standard circuit designs. This part maintains T-1 package geometry and ROHS3 compliance but operates at higher current, requiring circuit verification before substitution.

Not Recommended for New Designs: SLI-343YC3F The Rohm SLI-343YC3F carries "Not For New Designs" status and should not be selected for new production applications despite its high brightness rating of 350mcd.

Frequently Asked Questions (FAQ)

Q: Can TLHY4205 be used as a direct drop-in replacement for TLHY4201? A: Yes. Both parts share identical forward voltage (2.4V), test current (10mA), wavelength (588nm), and T-1 radial package configuration. The TLHY4205 provides 20mcd versus 15mcd on the original, representing a brightness increase that does not affect circuit compatibility.

Q: What is the difference between HLMP-1420 and HLMP-1421? A: HLMP-1420 and HLMP-1421 are electrically and mechanically identical. Both deliver 15mcd at 10mA with 2V forward voltage and T-1 package. The distinction is packaging format: HLMP-1420 is supplied in bulk, while HLMP-1421 is available in both bulk and tape & reel (HLMP-1421-F0002) configurations for automated assembly.

Q: Can I substitute HLMP-1420 for TLHY4201 without circuit modification? A: Substitution is feasible with minor circuit adjustment. The HLMP-1420 operates at 2V forward voltage compared to 2.4V on the TLHY4201. Recalculate the current-limiting resistor value to maintain desired LED current. Brightness is matched at 15mcd, and T-1 package geometry is identical, ensuring mechanical compatibility.

Q: Why is LTL1CHJSTNN rated at 180mcd while TLHY4201 is 15mcd? A: The LTL1CHJSTNN operates at 20mA test current versus 10mA on the TLHY4201. Higher test current produces proportionally higher light output. Substitution requires circuit redesign to accommodate the increased current requirement and verify that the application can tolerate the enhanced brightness.

Q: What does "Not For New Designs" mean for SLI-343YC3F? A: This status indicates the manufacturer (Rohm) has discontinued active support and recommends against using this part in new product development. While existing inventory may be available, long-term supply cannot be guaranteed. Select active-status alternatives for new designs.

Q: Are all substitute parts ROHS3 compliant? A: All recommended substitute parts listed carry ROHS3 compliance status, matching the original TLHY4201. Moisture Sensitivity Level (MSL) is 1 (Unlimited) across all parts, indicating no special moisture handling requirements during storage or assembly.

Q: What is the viewing angle difference between TLHY4201 (44°) and substitute parts (45°)? A: The 1° difference is negligible for indication applications. Both 44° and 45° viewing angles are functionally equivalent for standard LED indication circuits. This minor specification variance does not affect circuit performance or mechanical fit.

Q: Can I use 5219431F (Dialight) as a substitute? A: The 5219431F is compatible from a package and color perspective (yellow, T-1 radial, 30mcd). However, forward voltage and wavelength data are not provided in the specification. Verification against your circuit design parameters is required before substitution. The part operates at 20mA test current, requiring circuit adjustment from the original 10mA specification.

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