SM1206SRC-IL Equivalent & Substitute Parts Reference

Part Overview

The SM1206SRC-IL is a red LED indication component manufactured by Bivar Inc. in 1206 (3216 Metric) surface mount package format. This discrete LED operates at 1.85V forward voltage with a 640nm dominant wavelength and 36mcd brightness rating. The component is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility within the same package class and electrical operating parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	SM1206SRC-IL
Manufacturer	Bivar Inc.
Product Status	Obsolete
Color	Red
Package / Case	1206 (3216 Metric)
Mounting Type	Surface Mount
Voltage - Forward (Vf) (Typ)	1.85V
Current - Test	20mA
Wavelength - Dominant	640nm
Millicandela Rating	36mcd
Viewing Angle	30°
Lens Transparency	Clear
Size / Dimension	3.20mm L x 1.60mm W
Height (Max)	1.40mm
Moisture Sensitivity Level (MSL)	4 (72 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the SM1206SRC-IL is determined by the following mandatory parameters:

Primary Compatibility Criteria:

Package / Case: 1206 (3216 Metric)
Mounting Type: Surface Mount
Color: Red
Lens Transparency: Clear
Configuration: Standard

Electrical Operating Range:

Voltage - Forward (Vf): 1.8V to 2.0V (±0.15V tolerance band)
Current - Test: 20mA nominal
Wavelength - Dominant: 625nm to 645nm (red spectrum range)

Physical Constraints:

Size / Dimension: 3.20mm L x 1.60mm W (fixed)
Height (Max): 0.75mm to 1.40mm (vertical clearance dependent)

All identified substitute parts maintain the 1206 package footprint and surface mount configuration. Variations in millicandela rating, viewing angle, and lens style are permissible when the primary electrical and mechanical parameters remain within specified ranges.

Parameter Comparison

Parameter	SM1206SRC-IL (Main)	SM1206RC-IL	APT3216LSECK/J3-PRV	XZMDK55W-1
Manufacturer	Bivar Inc.	Bivar Inc.	Kingbright	SunLED
Product Status	Obsolete	Active	Active	Active
Color	Red	Red	Red	Red
Package / Case	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Voltage - Forward (Vf) (Typ)	1.85V	2.0V	1.8V	1.95V
Current - Test	20mA	20mA	2mA	20mA
Wavelength - Dominant	640nm	645nm	625nm	630nm
Millicandela Rating	36mcd	2.1mcd	40mcd	79mcd
Viewing Angle	30°	30°	120°	120°
Lens Transparency	Clear	Clear	Clear	Clear
Size / Dimension	3.20mm L x 1.60mm W	3.20mm L x 1.60mm W	3.20mm L x 1.60mm W	3.20mm L x 1.60mm W
Height (Max)	1.40mm	1.40mm	0.75mm	0.75mm
Moisture Sensitivity Level (MSL)	4 (72 Hours)	4 (72 Hours)	3 (168 Hours)	3 (168 Hours)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

SM1206RC-IL (Bivar Inc.)

This substitute maintains manufacturer continuity with the obsolete SM1206SRC-IL. Both components are manufactured by Bivar Inc. and share identical package dimensions (3.20mm L x 1.60mm W, 1.40mm height) and MSL rating (4, 72 Hours). The SM1206RC-IL operates at 2.0V forward voltage versus 1.85V on the original part, representing a 0.15V increase within acceptable tolerance. Wavelength shift from 640nm to 645nm remains within the red spectrum. Product status is active with 1068 units in stock. This option is recommended for direct replacement in applications where Bivar component sourcing is preferred and the 0.15V voltage differential is accommodated by circuit design.

APT3216LSECK/J3-PRV (Kingbright)

This Kingbright substitute operates at 1.8V forward voltage, closest to the original 1.85V specification. The component achieves 40mcd brightness, exceeding the original 36mcd rating. Wavelength at 625nm represents a 15nm shift toward shorter wavelengths within acceptable red spectrum range. Key differentiators include reduced height (0.75mm versus 1.40mm), improved MSL rating (3, 168 Hours versus 4, 72 Hours), and expanded viewing angle (120° versus 30°). The lower test current (2mA versus 20mA) indicates different characterization methodology. ROHS3 compliance and REACH unaffected status are confirmed. This option is recommended for space-constrained applications and designs requiring enhanced moisture resistance.

XZMDK55W-1 (SunLED)

This SunLED substitute provides the highest brightness rating at 79mcd, more than double the original 36mcd specification. Forward voltage at 1.95V closely matches the original 1.85V requirement. Wavelength at 630nm falls within acceptable red spectrum parameters. Physical profile matches APT3216LSECK/J3-PRV with 0.75mm maximum height and 120° viewing angle. MSL rating of 3 (168 Hours) provides superior moisture protection compared to the original MSL 4 specification. ROHS3 compliance and REACH unaffected status are confirmed. This option is recommended for applications requiring maximum light output and improved environmental protection, with 5708 units available in stock.

Frequently Asked Questions (FAQ)

Q: Can SM1206RC-IL directly replace SM1206SRC-IL in existing PCB layouts?

A: Yes. Both components share identical package dimensions (3.20mm L x 1.60mm W) and 1206 (3216 Metric) footprint. PCB layout modifications are not required. Circuit design must accommodate the 0.15V forward voltage increase (1.85V to 2.0V) through resistor value adjustment if current limiting is critical.

Q: What is the primary difference between APT3216LSECK/J3-PRV and XZMDK55W-1?

A: Both components share identical physical dimensions and MSL ratings. The primary difference is brightness output: APT3216LSECK/J3-PRV provides 40mcd while XZMDK55W-1 delivers 79mcd. Selection depends on required light intensity for the application. XZMDK55W-1 is preferred for high-visibility indication requirements.

Q: Are all substitute parts ROHS3 compliant?

A: SM1206RC-IL does not specify RoHS status in provided documentation. APT3216LSECK/J3-PRV and XZMDK55W-1 are both confirmed ROHS3 compliant. For applications requiring RoHS certification, APT3216LSECK/J3-PRV or XZMDK55W-1 are required.

Q: What does MSL rating difference mean for component handling?

A: MSL 4 (72 Hours) on SM1206SRC-IL and SM1206RC-IL requires reflow soldering within 72 hours of moisture exposure. MSL 3 (168 Hours) on APT3216LSECK/J3-PRV and XZMDK55W-1 extends this window to 168 hours, reducing moisture-related soldering defects in high-humidity manufacturing environments.

Q: Can components with different viewing angles (30° versus 120°) be interchanged?

A: Viewing angle substitution is application-dependent. The original SM1206SRC-IL at 30° provides narrow-angle indication suitable for direct-view applications. APT3216LSECK/J3-PRV and XZMDK55W-1 at 120° provide wide-angle visibility. Substitution is valid only if the application tolerates or benefits from increased viewing angle.

Q: What is the impact of test current differences (20mA versus 2mA)?

A: Test current indicates the characterization condition for brightness and wavelength specifications. APT3216LSECK/J3-PRV is characterized at 2mA while other components use 20mA. This reflects different design optimization. Actual operating current in the circuit is determined by circuit design, not test current. Both components operate at identical forward voltages within the specified range.

Q: Are all substitute parts available in the same packaging format?

A: SM1206RC-IL is supplied in Tape & Reel (TR) format. APT3216LSECK/J3-PRV is supplied in Cut Tape (CT) & Digi-Reel® format. XZMDK55W-1 is supplied in Tape & Reel (TR) format. Packaging format does not affect component functionality but may impact procurement and assembly processes.

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