TLHG6400 Equivalent & Substitute Parts

Part Overview

The TLHG6400 is a green diffused LED in T-1 3/4 (5mm) through-hole radial package manufactured by Vishay Semiconductor Opto Division. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production support. The TLHG6400 operates at 2.4V forward voltage with 10mcd brightness at 10mA test current and features a 569nm dominant wavelength with 60° viewing angle. Equivalent and substitute parts must maintain compatibility across electrical characteristics, mechanical form factor, and mounting requirements.

Key Parameters

Parameter	TLHG6400 Value
Color	Green
Wavelength - Dominant	569nm
Wavelength - Peak	565nm
Voltage - Forward (Vf) Typical	2.4V
Current - Test	10mA
Millicandela Rating	10mcd
Lens Transparency	Diffused
Lens Style	Round with Domed Top
Lens Size	5mm, T-1 3/4
Viewing Angle	60°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	9.10mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution logic for the TLHG6400 is based on the following critical parameters: color (green), wavelength range (565-569nm dominant), forward voltage tolerance (2.0-2.4V), lens transparency (diffused), mounting type (through hole radial), and physical form factor (5mm T-1 3/4 package). Parts are grouped into two categories:

Category 1: Direct Parametric Equivalents — Parts maintaining identical or near-identical electrical and mechanical specifications with active product status.

Category 2: Functional Substitutes — Parts with compatible green wavelength and through-hole mounting but with variations in brightness (millicandela), forward voltage, or viewing angle that remain within acceptable application ranges.

Yellow-green variants (573nm wavelength) are included as functional substitutes where brightness and viewing angle characteristics support equivalent circuit performance despite wavelength shift.

Parameter Comparison

Part Number	Manufacturer	Color	Wavelength - Dominant (nm)	Vf Typical (V)	Current - Test (mA)	Millicandela (mcd)	Viewing Angle (°)	Lens Size	Height Max (mm)	Product Status
TLHG6400	Vishay	Green	569	2.4	10	10	60	5mm T-1 3/4	9.10	Obsolete
TLHG6401	Vishay	Green	569	2.4	10	12	60	5mm T-1 3/4	9.10	Active
HLMP-3554	Broadcom	Green	569	2.1	10	6.7	50	5mm T-1 3/4	6.35	Active
HLMP-3507-D0001	Broadcom	Green	569	2.1	10	4.2	60	5mm T-1 3/4	9.19	Active
HLMP-3507-D00B2	Broadcom	Green	569	2.1	10	4.2	—	Right Angle	—	Active
5219674F	Dialight	Green	569	2.1	20	40	60	4.75mm	8.21	Active
151051VS04000	Würth Elektronik	Green	572	2.1	20	140	40	4.90mm	8.95	Active
1383SYGD/S530-E2	Everlight	Yellow-Green	573	2.0	20	200	25	5.00mm	8.90	Active
323-2SYGD/S530-E2	Everlight	Yellow-Green	573	2.0	20	80	60	4.70mm	6.30	Active
336SYGSYGD/S530-E2	Everlight	Yellow-Green	573	2.0	20	16	90	5.00mm	8.90	Active
4300H5LC	VCC	Green	565	1.8	2	2.3	50	5mm T-1 3/4	8.89	Not For New Designs

Engineering Selection Recommendations

Primary Recommendation: TLHG6401 — Direct parametric equivalent with identical electrical specifications (2.4V, 10mA, 569nm wavelength) and mechanical form factor. Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Brightness increase from 10mcd to 12mcd represents minimal performance variance suitable for direct replacement in existing designs.

Secondary Recommendation: HLMP-3554 — Active Broadcom equivalent maintaining 569nm wavelength, 10mA test current, and T-1 3/4 package. Forward voltage reduced to 2.1V with brightness of 6.7mcd. Shorter height (6.35mm vs 9.10mm) requires mechanical clearance verification. Full RoHS3 compliance and unlimited MSL rating.

Alternative for Brightness-Critical Applications: 5219674F — Dialight green LED (569nm) with 40mcd brightness at 20mA test current and 2.1V forward voltage. Maintains 60° viewing angle and through-hole radial mounting. Requires circuit current adjustment from 10mA to 20mA. Active product status with full compliance certifications.

Not Recommended for New Designs: 4300H5LC — VCC part marked "Not For New Designs" despite active inventory. Significantly lower brightness (2.3mcd) and reduced forward voltage (1.8V) create incompatibility with standard circuit designs for the TLHG6400.

All recommended substitutes maintain RoHS3 compliance, REACH unaffected status, and EAR99 ECCN classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can TLHG6401 replace TLHG6400 in existing PCB designs without modification?

A: Yes. TLHG6401 maintains identical forward voltage (2.4V), test current (10mA), wavelength (569nm), and T-1 3/4 through-hole radial package. The 2mcd brightness increase (10mcd to 12mcd) is within normal LED tolerance ranges and does not require circuit redesign.

Q: What is the impact of using HLMP-3554 instead of TLHG6400?

A: HLMP-3554 operates at 2.1V forward voltage (0.3V lower) and provides 6.7mcd brightness (33% lower). The package height is reduced from 9.10mm to 6.35mm. Circuit current remains at 10mA. Verify mechanical clearance and brightness adequacy for the application before substitution.

Q: Are yellow-green LEDs (573nm) acceptable substitutes for the green TLHG6400?

A: Yellow-green variants (1383SYGD/S530-E2, 323-2SYGD/S530-E2, 336SYGSYGD/S530-E2) provide functional substitution where color perception and brightness are compatible with application requirements. Wavelength shift from 569nm to 573nm produces visible color difference. These parts operate at 2.0V forward voltage and require 20mA test current. Evaluate color matching and brightness requirements before selection.

Q: Why is HLMP-3507-D00B2 listed as a substitute if it has a different package?

A: HLMP-3507-D00B2 is a right-angle through-hole variant of the HLMP-3507 series with identical electrical specifications (2.1V, 10mA, 569nm, 4.2mcd). It is included as a functional substitute for applications where right-angle mounting is acceptable or preferred. Standard radial variants (HLMP-3507-D0001) are preferred for direct replacement.

Q: What compliance certifications apply to all recommended substitutes?

A: All recommended active-status substitutes maintain RoHS3 compliance, REACH unaffected status, and EAR99 ECCN classification. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special storage or handling requirements.

Q: Can 5219674F be used if the circuit is designed for 10mA operation?

A: 5219674F requires 20mA test current compared to TLHG6400's 10mA. Direct substitution without circuit modification will result in reduced brightness. Circuit redesign to support 20mA operation is necessary for proper performance. Brightness at 20mA is 40mcd, providing significant brightness increase over the original 10mcd at 10mA.

Q: Is the TLHG6400 still available for purchase?

A: TLHG6400 is classified as obsolete. Current inventory of 1,056 pieces is available as new original stock, but long-term availability is not guaranteed. TLHG6401 (active status, 12,156 pieces in stock) is the recommended transition path for ongoing production requirements.

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