LTST-T680VEKT Equivalent & Substitute Parts

Part Overview

The LTST-T680VEKT is a red surface-mount LED indicator manufactured by Lite-On Inc., featuring a 624nm dominant wavelength and 1055mcd brightness rating in a 2-PLCC package. This part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. The part delivers red indication across industrial and consumer electronics applications requiring discrete LED solutions with clear lens optics.

Substiute Parts

LTST-T680VEKT

Lite-On Inc.In Stock: 1250LTST-T680VEKT Datasheet

Current PartRFQ

LTST-T680VEWT

Lite-On Inc.In Stock: 1187LTST-T680VEWT Datasheet

DirectRFQ

AA3528SESK/J3

KingbrightIn Stock: 24671AA3528SESK/J3 Datasheet

MFR RecommendedRFQ

SML-LX2832SIC-TR

Lumex Opto/Components Inc.In Stock: 2349SML-LX2832SIC-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTST-T680VEKT is determined by the following critical parameters:

• Color: Red (all substitutes must be red)
• Package / Case: 2-PLCC or compatible 2-lead surface-mount package
• Mounting Type: Surface Mount
• Voltage - Forward (Vf): 2.0V to 2.2V range
• Current - Test: 20mA
• Viewing Angle: 120°
• Size / Dimension: 3.20mm L x 2.80mm W (footprint compatibility)
• RoHS Status: ROHS3 Compliant
• Wavelength Range: 624nm to 625nm dominant wavelength

The substitute parts listed maintain compatibility across these parameters while accommodating minor variations in millicandela rating, lens transparency, and package designation (2-LCC vs. 2-PLCC).

Parameter Comparison

Engineering Selection Recommendations

LTST-T680VEWT (Lite-On Inc.) is the primary direct substitute. It maintains identical brightness (1055mcd), forward voltage (2.1V), and wavelength (624nm) specifications. The package transitions from 2-PLCC to 2-LCC (J-Lead), with lens transparency changing from clear to diffused. This part is active and ROHS3 compliant. Height reduction from 2.00mm to 1.90mm accommodates tighter PCB clearance requirements.

AA3528SESK/J3 (Kingbright) provides a 2-PLCC package alternative with clear lens matching the original optical characteristics. Forward voltage increases to 2.2V and brightness reduces to 450mcd. Wavelength remains within specification at 625nm dominant. This part is active with full ROHS3 compliance and higher inventory availability (24,600 units).

SML-LX2832SIC-TR (Lumex Opto/Components Inc.) offers a 2-PLCC package with clear lens and the lowest forward voltage (2V) among substitutes. Brightness is reduced to 250mcd. This part is active and ROHS3 compliant, suitable for applications where lower brightness is acceptable and forward voltage margin is critical.

All substitutes maintain 120° viewing angle, 20mA test current, and identical PCB footprint dimensions (3.20mm L x 2.80mm W).

Frequently Asked Questions (FAQ)

Q: Can LTST-T680VEWT replace LTST-T680VEKT directly on the PCB?

A: Yes, with package consideration. Both parts share identical footprint dimensions (3.20mm L x 2.80mm W) and mounting type. The LTST-T680VEWT is 0.10mm shorter (1.90mm vs. 2.00mm), which does not affect PCB assembly. The primary difference is lens transparency: LTST-T680VEWT is diffused versus clear on the original. This affects light distribution but maintains the same brightness rating (1055mcd).

Q: What is the brightness difference between substitutes?

A: LTST-T680VEWT maintains 1055mcd (identical to original). AA3528SESK/J3 provides 450mcd (57% reduction). SML-LX2832SIC-TR provides 250mcd (76% reduction). Selection depends on application brightness requirements.

Q: Are all substitutes ROHS3 compliant?

A: Yes. LTST-T680VEKT, LTST-T680VEWT, AA3528SESK/J3, and SML-LX2832SIC-TR are all ROHS3 compliant with MSL 3 (168 Hours) moisture sensitivity rating.

Q: What is the forward voltage tolerance across substitutes?

A: LTST-T680VEKT and LTST-T680VEWT operate at 2.1V. AA3528SESK/J3 operates at 2.2V (0.1V higher). SML-LX2832SIC-TR operates at 2V (0.1V lower). All operate within standard LED forward voltage tolerance and are compatible with 20mA test current.

Q: Does lens transparency affect electrical compatibility?

A: No. Lens transparency (clear vs. diffused) is an optical characteristic only. It does not affect electrical parameters, forward voltage, current rating, or circuit compatibility. Selection is based on visual appearance and light distribution requirements.

Q: Are all substitutes available in Tape & Reel packaging?

A: LTST-T680VEWT, AA3528SESK/J3, and SML-LX2832SIC-TR are all available in Tape & Reel (TR) packaging suitable for automated assembly.