SML-310PTT86B Equivalent & Substitute Parts

Part Overview

The SML-310PTT86B is a green 560nm LED indicator manufactured by Rohm Semiconductor in 0603 (1608 Metric) surface mount package. This component is classified as Last Time Buy, indicating limited future availability. The part delivers 4mcd brightness with a 2.2V forward voltage and 20mA test current, designed for discrete LED indication applications in compact form factors.

Identifying equivalent and substitute parts is necessary due to the Last Time Buy status, which restricts long-term procurement. Alternative parts with matching or superior electrical and mechanical characteristics ensure design continuity and supply chain reliability.

Key Parameters

Parameter	Value
Manufacturer Part Number	SML-310PTT86B
Manufacturer	Rohm Semiconductor
Color	Green
Wavelength - Dominant	560nm
Voltage - Forward (Vf) (Typ)	2.2V
Current - Test	20mA
Millicandela Rating	4mcd
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Lens Style	Rectangle with Flat Top
Lens Size	1.20mm x 0.80mm
Size / Dimension	1.60mm L x 0.80mm W
Height (Max)	0.90mm
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the SML-310PTT86B is determined by the following mandatory parameters:

Color: Green
Wavelength - Dominant: 560nm
Voltage - Forward (Vf) (Typ): 2.2V
Current - Test: 20mA
Package / Case: 0603 (1608 Metric)
Mounting Type: Surface Mount
Lens Style: Rectangle with Flat Top
Lens Size: 1.20mm x 0.80mm
Size / Dimension: 1.60mm L x 0.80mm W

Substitute parts must match all electrical parameters (color, wavelength, forward voltage, test current) and mechanical parameters (package, mounting type, lens configuration, physical dimensions). Variations in millicandela rating, lens transparency, height, and product status are permitted when all core parameters align.

Parameter Comparison

Parameter	SML-310PTT86B (Main)	SML-D12P8WT86 (Substitute)	SML-310PTT86 (Substitute)
Manufacturer	Rohm Semiconductor	Rohm Semiconductor	Rohm Semiconductor
Color	Green	Green	Green
Wavelength - Dominant	560nm	560nm	—
Voltage - Forward (Vf) (Typ)	2.2V	2.2V	2.2V
Current - Test	20mA	20mA	20mA
Millicandela Rating	4mcd	6.3mcd	4mcd
Package / Case	0603 (1608 Metric)	0603 (1608 Metric)	0603 (1608 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Lens Style	Rectangle with Flat Top	Rectangle with Flat Top	Rectangle with Flat Top
Lens Size	1.20mm x 0.80mm	1.20mm x 0.80mm	1.20mm x 0.80mm
Lens Color	Colorless	White	Colorless
Lens Transparency	Clear	Diffused	Clear
Size / Dimension	1.60mm L x 0.80mm W	1.60mm L x 0.80mm W	1.60mm L x 0.80mm W
Height (Max)	0.90mm	0.65mm	0.90mm
Product Status	Last Time Buy	Active	Last Time Buy
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	—	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

SML-D12P8WT86 is the primary substitute for SML-310PTT86B. This part is Active status with ROHS3 compliance and MSL 3 rating, ensuring long-term availability and regulatory compliance. The SML-D12P8WT86 delivers higher brightness (6.3mcd versus 4mcd) and features a diffused white lens, which may alter light distribution characteristics compared to the clear colorless lens of the main part. The reduced maximum height (0.65mm versus 0.90mm) provides additional design flexibility for space-constrained applications. All electrical parameters match exactly.

SML-310PTT86 is a parametric equivalent with identical electrical specifications and matching lens configuration (clear colorless). This part maintains the same 4mcd brightness and 0.90mm height as the main part. However, SML-310PTT86 retains Last Time Buy status, offering no supply chain advantage over the main part.

For applications where lens transparency and light distribution are critical, SML-310PTT86 is preferred. For applications prioritizing long-term availability and regulatory compliance, SML-D12P8WT86 is the recommended selection.

Frequently Asked Questions (FAQ)

Q: Can SML-D12P8WT86 replace SML-310PTT86B in all applications?

A: SML-D12P8WT86 matches all mandatory electrical parameters (color, wavelength, forward voltage, test current) and mechanical parameters (package, mounting type, lens size, physical dimensions). The diffused white lens and higher brightness (6.3mcd) may affect light distribution and perceived intensity. Applications sensitive to lens transparency or brightness must evaluate optical performance independently.

Q: What is the significance of the diffused lens on SML-D12P8WT86?

A: The diffused white lens on SML-D12P8WT86 scatters light more broadly than the clear colorless lens on SML-310PTT86B, resulting in a wider viewing angle and softer light distribution. This affects visual appearance and may impact applications requiring directional or concentrated light output.

Q: Why is SML-310PTT86B classified as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued or will discontinue production. This restricts future procurement and makes identifying active substitute parts essential for supply chain continuity.

Q: Are there compliance differences between the main part and substitutes?

A: SML-D12P8WT86 and SML-310PTT86 both carry ROHS3 compliance and MSL 3 ratings. Compliance information for SML-310PTT86B was not provided in the specification data.

Q: Does the reduced height of SML-D12P8WT86 affect compatibility?

A: SML-D12P8WT86 has a maximum height of 0.65mm compared to 0.90mm for SML-310PTT86B. This 0.25mm reduction may improve clearance in space-constrained designs but does not affect electrical compatibility or standard PCB assembly processes.

Q: What packaging options are available for these parts?

A: SML-310PTT86B is supplied in standard packaging. SML-D12P8WT86 is available in Cut Tape (CT) and Digi-Reel® packaging. SML-310PTT86 is supplied in Tape & Reel (TR) format. Packaging selection depends on procurement volume and assembly requirements.

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