SM1206RC Red 645nm LED Indication - 1206 SMD Equivalent & Substitute Parts

Part Overview

The SM1206RC is an active red indication LED manufactured by Bivar Inc., featuring a 645nm dominant wavelength and 0.9 millicandela rating in a 1206 (3216 metric) surface mount package. This component is ROHS3 compliant and rated for 2V forward voltage with a 20mA test current. The part is actively stocked with 799 units in inventory. Equivalent and substitute parts are necessary to address component availability, lead time constraints, or application-specific performance requirements while maintaining form factor and functional compatibility within 1206 surface mount assemblies.

Key Parameters

Parameter	SM1206RC
Package / Case	1206 (3216 Metric)
Mounting Type	Surface Mount
Color	Red
Lens Transparency	Clear
Voltage - Forward (Vf) (Typ)	2V
Current - Test	20mA
Size / Dimension	3.20mm L x 1.60mm W
Height (Max)	1.10mm
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SM1206RC are qualified based on the following mandatory compatibility parameters:

Package Type: 1206 (3216 metric) surface mount only
Color and Lens Transparency: Red with clear lens
Forward Voltage (Vf): Operating range 1.7V to 2V
Physical Dimensions: 3.20mm length ± tolerance, 1.60mm width ± tolerance
Mounting Configuration: Surface mount on standard PCB assembly equipment
Compliance: ROHS3 compliance required

Secondary parameters such as millicandela rating, viewing angle, wavelength specificity, and test current variations are allowable within substitute selection, as these reflect manufacturer design differences while preserving the core indication function within the specified electrical and mechanical envelope.

Parameter Comparison

Part Number	Manufacturer	Package	Vf (Typ)	Current - Test	Size (L x W)	Height (Max)	Millicandela	Viewing Angle	RoHS Status
SM1206RC	Bivar Inc.	1206	2V	20mA	3.20 x 1.60mm	1.10mm	0.9mcd	140°	ROHS3
APT3216EC	Kingbright	1206	2V	20mA	3.20 x 1.60mm	0.75mm	8mcd	120°	ROHS3
APT3216SURCK	Kingbright	1206	1.95V	20mA	3.20 x 1.60mm	0.75mm	80mcd	120°	ROHS3
LTST-C150EKT	Lite-On Inc.	1206	2V	10mA	3.20 x 1.60mm	1.10mm	6mcd	130°	ROHS3
SML-LX1206IC-TR	Lumex Opto/Components Inc.	1206	2V	20mA	3.20 x 1.50mm	1.10mm	9mcd	130°	ROHS3
SML-LX1206SRC-TR	Lumex Opto/Components Inc.	1206	1.7V	20mA	3.20 x 1.60mm	1.10mm	25mcd	140°	ROHS3
SML-LXF1206SRC-TR	Lumex Opto/Components Inc.	1206	1.7V	20mA	3.20 x 1.60mm	1.10mm	70mcd	140°	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and active product status, meeting compliance requirements for standard procurement. APT3216EC and APT3216SURCK from Kingbright provide reduced height (0.75mm) suitable for applications with board-to-board clearance constraints. LTST-C150EKT from Lite-On Inc. operates at a reduced test current of 10mA, suitable for low-power indication circuits. SML-LX1206SRC-TR and SML-LXF1206SRC-TR from Lumex operate at 1.7V forward voltage with 140° viewing angle matching the primary wavelength spectrum of the SM1206RC. Selection between substitutes depends on application-specific requirements for brightness, forward voltage tolerance, viewing angle, and height envelope within the 1206 package constraint.

Frequently Asked Questions (FAQ)

Q: Can all listed parts be used interchangeably in the same PCB footprint? A: All substitute parts use the 1206 (3216 metric) surface mount package with 3.20mm length and 1.60mm width dimensions. Height variations (0.75mm to 1.10mm) do not affect footprint compatibility but may impact board-to-board spacing. Standard 1206 pick-and-place equipment accommodates all listed parts without modification.

Q: What is the primary difference between the SM1206RC and higher millicandela substitutes? A: The SM1206RC provides 0.9 millicandela brightness, while substitutes such as APT3216SURCK (80mcd) and SML-LXF1206SRC-TR (70mcd) deliver significantly higher brightness. Higher brightness options are suitable for applications requiring visible indication in ambient light conditions, while the lower brightness SM1206RC is appropriate for controlled-environment indication.

Q: Are there forward voltage differences that affect circuit design? A: The SM1206RC operates at 2V forward voltage (typical). Substitutes SML-LX1206SRC-TR and SML-LXF1206SRC-TR operate at 1.7V, while APT3216SURCK operates at 1.95V. These variations within the 1.7V to 2V range are tolerable in series-resistor-limited circuits. Circuit redesign is not required for substitution within this voltage envelope.

Q: What is the difference between current-test rated at 10mA versus 20mA? A: Current-test rating indicates the standardized measurement condition for brightness specification. LTST-C150EKT uses 10mA test current, while most substitutes use 20mA. Both operate safely across standard indicator circuits. The test current difference reflects manufacturer specification methodology and does not limit practical substitution.

Q: Do all substitutes support the same viewing angle? A: Viewing angle varies between 120° (Kingbright APT3216 series) and 140° (SM1206RC, Lumex SML-LX1206SRC-TR, and SML-LXF1206SRC-TR). Selection depends on application visibility requirements. Kingbright parts with 120° angle are suitable for direct line-of-sight indication, while 140° angle provides wider peripheral visibility.

Q: Are all substitutes available in Tape & Reel packaging? A: Five of seven substitutes are supplied in Tape & Reel (TR) packaging suitable for automated assembly. LTST-C150EKT is supplied in Cut Tape (CT) & Digi-Reel® format. Both packaging formats are compatible with standard PCB assembly processes.

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