SML310BATT86 Equivalent & Substitute Parts

Part Overview

The SML310BATT86 is a blue LED indication component manufactured by Rohm Semiconductor in 0603 (1608 Metric) surface mount package. This discrete 3.8V LED features a clear lens with a rectangular flat-top design and operates at a forward voltage of 3.8V with a test current of 20mA. The component is currently classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	SML310BATT86
Manufacturer	Rohm Semiconductor
Product Status	Obsolete
Color	Blue
Package / Case	0603 (1608 Metric)
Voltage - Forward (Vf) (Typ)	3.8V
Current - Test	20mA
Wavelength - Peak	428nm
Millicandela Rating	3.6mcd
Lens Style	Rectangle with Flat Top
Lens Transparency	Clear
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the SML310BATT86 is determined by the following critical parameters:

Package compatibility: 0603 (1608 Metric) surface mount form factor
Color specification: Blue LED indication
Lens configuration: Clear, rectangular flat-top design
Electrical operating range: Forward voltage and test current compatibility
Mounting type: Surface mount technology
Regulatory compliance: RoHS3 and REACH status

The LTST-C190TBKT from Lite-On Inc. qualifies as a substitute based on matching package dimensions, color, lens transparency, lens style, mounting type, and regulatory compliance requirements. Both components share identical physical footprints and are designed for the same application category.

Parameter Comparison

Parameter	SML310BATT86 (Rohm)	LTST-C190TBKT (Lite-On)	Compatibility Notes
Package / Case	0603 (1608 Metric)	0603 (1608 Metric)	Identical package
Color	Blue	Blue	Matched color specification
Lens Transparency	Clear	Clear	Matched lens type
Lens Style	Rectangle with Flat Top	Rectangle with Flat Top	Identical lens geometry
Lens Size	1.20mm x 0.80mm	1.10mm x 0.80mm	Minor dimensional variation
Size / Dimension	1.60mm L x 0.80mm W	1.60mm L x 0.80mm W	Identical footprint
Height (Max)	0.90mm	0.90mm	Matched height
Voltage - Forward (Vf) (Typ)	3.8V	3.3V	0.5V difference; circuit design dependent
Current - Test	20mA	20mA	Matched test current
Wavelength - Peak	428nm	468nm	40nm wavelength shift
Millicandela Rating	3.6mcd	104mcd	Significantly higher brightness
Viewing Angle	Not specified	130°	LTST-C190TBKT provides wider viewing angle
Mounting Type	Surface Mount	Surface Mount	Identical mounting technology
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched compliance
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	Identical MSL rating
REACH Status	REACH Unaffected	REACH Unaffected	Matched regulatory status
Product Status	Obsolete	Active	Substitute is in active production

Engineering Selection Recommendations

The LTST-C190TBKT is suitable as a substitute for the SML310BATT86 based on the following engineering criteria:

Both components meet ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment
Identical 0603 (1608 Metric) package footprint enables direct PCB layout compatibility
Matching surface mount mounting type and MSL rating (3, 168 Hours) maintain assembly process compatibility
Blue color specification and clear lens transparency are preserved
Active product status of the LTST-C190TBKT ensures long-term availability and supply chain continuity

Circuit design review is required to evaluate the 0.5V forward voltage difference (3.8V vs. 3.3V) and the 40nm wavelength shift (428nm vs. 468nm), as well as the significantly higher brightness output (104mcd vs. 3.6mcd). These electrical and optical differences may impact circuit performance and visual indication characteristics depending on application requirements.

Frequently Asked Questions (FAQ)

Q: Can the LTST-C190TBKT be used as a direct drop-in replacement for the SML310BATT86?

A: Physical and package compatibility is confirmed. However, the forward voltage difference (3.8V vs. 3.3V) and brightness difference (3.6mcd vs. 104mcd) require circuit design evaluation. The substitute operates at lower forward voltage and produces significantly higher light output.

Q: What is the impact of the wavelength difference between these two LEDs?

A: The SML310BATT86 operates at 428nm peak wavelength, while the LTST-C190TBKT operates at 468nm. This 40nm shift represents a change in the blue spectrum. Visual perception and color matching applications may be affected by this difference.

Q: Are both components suitable for the same PCB assembly process?

A: Yes. Both components share identical 0603 (1608 Metric) package dimensions, matching MSL ratings (3, 168 Hours), and surface mount mounting type. Standard SMD assembly processes are compatible with both parts.

Q: What regulatory compliance considerations apply to this substitution?

A: Both the SML310BATT86 and LTST-C190TBKT are ROHS3 compliant and REACH unaffected. No regulatory barriers exist for substitution from a compliance perspective.

Q: Why is the LTST-C190TBKT significantly brighter than the SML310BATT86?

A: The LTST-C190TBKT is rated at 104mcd compared to the SML310BATT86 at 3.6mcd. This brightness difference is an inherent design characteristic of the two components and reflects different LED die specifications and optical designs.

Q: Is the viewing angle difference significant for substitution?

A: The LTST-C190TBKT specifies a 130° viewing angle, while the SML310BATT86 does not provide this specification. The wider viewing angle of the substitute may be advantageous for applications requiring broader light distribution.

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