LTST-S271TGKT Equivalent & Substitute Parts

Part Overview

The LTST-S271TGKT is an active green LED indication component manufactured by Lite-On Inc., designed for surface mount right-angle applications. This 2-SMD, 0604 package LED operates at 3.2V forward voltage with a dominant wavelength of 525nm and delivers 260.5mcd brightness. The component is ROHS3 compliant and maintains active product status, making it suitable for current production designs. Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameter ranges for this LED category.

Substiute Parts

LTST-S271TGKT

Lite-On Inc.In Stock: 831LTST-S271TGKT Datasheet

Current PartRFQ

SML-A12P8TT86

Rohm SemiconductorIn Stock: 21061SML-A12P8TT86 Datasheet

MFR RecommendedRFQ

SML-P11MTT86R

Rohm SemiconductorIn Stock: 62110SML-P11MTT86R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LTST-S271TGKT are identified based on the following allowed parameters for LED indication components:

• Color family (green or green-yellow spectrum acceptable)
• Wavelength range (dominant wavelength 525nm–569nm)
• Mounting type (surface mount configurations)
• Lens transparency (clear)
• Regulatory compliance (ROHS3, REACH Unaffected)
• Product status (active)

The two identified substitutes operate within these parameter boundaries. Variations in forward voltage, millicandela rating, package size, and current test specifications are permissible within the LED indication category, provided the component maintains functional equivalence for indication purposes.

Parameter Comparison

Engineering Selection Recommendations

All three components maintain active product status and ROHS3 compliance, qualifying them for current production use. Selection between the main part and substitutes depends on circuit design constraints:

SML-A12P8TT86 (Rohm Semiconductor EXCELED™ series) maintains right-angle mounting and similar package footprint to the main part, with reduced forward voltage (2.2V) and significantly lower brightness output (6.3mcd). This substitute is suitable for applications where brightness reduction is acceptable and lower operating voltage is beneficial.

SML-P11MTT86R (Rohm Semiconductor PicoLED™ series) offers the smallest form factor (0402 package, 1.00mm x 0.60mm) with the lowest forward voltage (1.9V) and minimal current draw (1mA test current). This substitute is appropriate for space-constrained designs and ultra-low-power applications, with the trade-off of significantly reduced brightness (2.1mcd) and non-right-angle mounting configuration.

Frequently Asked Questions (FAQ)

Q: Can SML-A12P8TT86 directly replace LTST-S271TGKT in existing designs?

A: SML-A12P8TT86 maintains compatible right-angle mounting and similar package dimensions (1.60mm x 1.15mm vs. 1.65mm x 1.15mm). However, the forward voltage differs (2.2V vs. 3.2V) and brightness is substantially lower (6.3mcd vs. 260.5mcd). Circuit redesign for voltage compatibility and brightness verification is required.

Q: What are the key differences between the two substitute parts?

A: SML-A12P8TT86 is optimized for standard indication applications with moderate brightness and right-angle mounting. SML-P11MTT86R is a miniature solution for space-constrained designs with ultra-low power consumption (1mA) but requires non-right-angle mounting and delivers minimal brightness output.

Q: Are all three parts suitable for the same circuit application?

A: No. The main part (LTST-S271TGKT) and SML-A12P8TT86 are functionally similar for indication purposes. SML-P11MTT86R is a specialized miniature component for different application categories requiring extreme size reduction and low power operation.

Q: What compliance certifications apply to all substitute parts?

A: All three components are ROHS3 compliant, REACH unaffected, and maintain active product status. Moisture sensitivity level is 3 (168 hours) for all parts.

Q: How do package differences affect PCB layout?

A: LTST-S271TGKT uses 0604 package (1.65mm x 1.15mm). SML-A12P8TT86 uses 1611 package (1.60mm x 1.15mm), requiring minimal layout adjustment. SML-P11MTT86R uses 0402 package (1.00mm x 0.60mm), requiring significant PCB redesign for placement and routing.