SMP2-URC Equivalent & Substitute Parts

Part Overview

The SMP2-URC is a red 625nm LED indication component manufactured by Bivar Inc. in a 2-PLCC surface mount package. This discrete LED operates at 1.9V forward voltage with a 700mcd brightness rating and 120° viewing angle. The component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs.

Key Parameters

Parameter	SMP2-URC Value
Manufacturer	Bivar Inc.
Color	Red
Wavelength - Dominant	625nm
Voltage - Forward (Vf) (Typ)	1.9V
Current - Test	20mA
Millicandela Rating	700mcd
Viewing Angle	120°
Package / Case	2-PLCC
Mounting Type	Surface Mount
Lens Style	Round with Flat Top
Lens Transparency	Clear
Size / Dimension	3.20mm L x 2.80mm W
Height (Max)	2.00mm
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts are grouped into two categories based on electrical and mechanical compatibility with the SMP2-URC:

Parametric Equivalent (Direct Replacement): Parts that maintain identical or functionally equivalent electrical characteristics and package form factor. These parts share the same forward voltage (1.9V), test current (20mA), wavelength range (625nm), brightness rating (700mcd), viewing angle (120°), and 2-PLCC package configuration. The primary distinction is product status (active versus obsolete) and packaging format (tape & reel availability).

Similar Substitutes (Functional Alternatives): Parts that operate within acceptable electrical parameter ranges but may differ in specific characteristics such as forward voltage (2.05V to 2.2V), brightness rating (63mcd to 650mcd), wavelength (626nm to 635nm), package type (1411/3528 metric or 2-PLCC variants), or test current (10mA to 20mA). These parts maintain red color emission, surface mount capability, 120° viewing angle, and clear lens transparency, enabling functional substitution in applications where exact parameter matching is not required.

Parameter Comparison

Parameter	SMP2-URC (Bivar)	SMTL2-URC (Bivar)	67-21/R6C-AP2R1B/2T (Everlight)	AA3528SESK/J3 (Kingbright)	AA3528SES/J3-AMT (Kingbright)
Manufacturer	Bivar Inc.	Bivar Inc.	Everlight Electronics Co Ltd	Kingbright	Kingbright
Color	Red	Red	Red	Red	Red
Wavelength - Dominant	625nm	625nm	626nm	625nm	635nm
Voltage - Forward (Vf) (Typ)	1.9V	1.9V	2.05V	2.2V	2.2V
Current - Test	20mA	20mA	20mA	20mA	20mA
Millicandela Rating	700mcd	700mcd	99mcd	450mcd	650mcd
Viewing Angle	120°	120°	120°	120°	120°
Package / Case	2-PLCC	2-PLCC	2-SMD, J-Lead	2-PLCC	2-PLCC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Lens Style	Round with Flat Top	Round with Flat Top	Round with Flat Top	Round with Flat Top	Round with Flat Top
Lens Transparency	Clear	Clear	Clear	Clear	Clear
Size / Dimension	3.20mm L x 2.80mm W	3.20mm L x 2.80mm W	3.10mm L x 2.70mm W	3.20mm L x 2.80mm W	3.20mm L x 2.80mm W
Height (Max)	2.00mm	2.10mm	2.10mm	2.10mm	2.10mm
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	4 (72 Hours)	4 (72 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Primary Recommendation: SMTL2-URC (Bivar Inc.)

The SMTL2-URC is the direct parametric equivalent to the obsolete SMP2-URC. Both components share identical electrical specifications: 625nm wavelength, 1.9V forward voltage, 20mA test current, and 700mcd brightness rating. Both feature 2-PLCC packaging, 120° viewing angle, and clear round flat-top lens design. The SMTL2-URC is classified as active product status with ROHS3 compliance and REACH unaffected certification. The primary distinction is packaging availability in tape & reel format with 15,010 units in stock, compared to the SMP2-URC's limited 810 units. Height specification increases marginally from 2.00mm to 2.10mm, which remains within typical PCB assembly tolerances.

Secondary Recommendations: Kingbright AA3528SESK/J3 and AA3528SES/J3-AMT

Both Kingbright components operate in 2-PLCC packages with identical 3.20mm x 2.80mm footprints and 120° viewing angles. The AA3528SESK/J3 provides 450mcd brightness at 2.2V forward voltage with 625nm wavelength, while the AA3528SES/J3-AMT delivers 650mcd at 2.2V with 635nm wavelength. Both are active products with ROHS3 compliance and improved moisture sensitivity (MSL 3 versus MSL 4). Forward voltage elevation from 1.9V to 2.2V requires circuit verification for current-limiting resistor adjustment. The AA3528SESK/J3 offers 24,600 units in tape & reel stock, providing superior availability.

Alternative Consideration: Everlight 67-21/R6C-AP2R1B/2T

This Everlight component operates at 2.05V forward voltage with 626nm wavelength and 99mcd brightness in a 2-SMD J-Lead package. While maintaining 2-PLCC supplier device package designation and 120° viewing angle, the reduced brightness rating and package variant classification limit direct substitution suitability. This option applies only to applications where lower brightness is acceptable and mechanical footprint compatibility is verified.

Frequently Asked Questions (FAQ)

Q: Can SMTL2-URC directly replace SMP2-URC without circuit modification?

A: Yes. The SMTL2-URC maintains identical forward voltage (1.9V), test current (20mA), wavelength (625nm), and brightness (700mcd) specifications. The 0.10mm height increase (2.00mm to 2.10mm) falls within standard PCB assembly tolerances. No resistor or circuit recalculation is required.

Q: What forward voltage adjustment is needed when substituting with Kingbright AA3528SESK/J3?

A: The AA3528SESK/J3 operates at 2.2V compared to SMP2-URC's 1.9V, a 0.3V increase. Current-limiting resistor values must be recalculated using Ohm's law: R = (Vsupply - Vf) / Iled. For example, in a 5V circuit with 20mA target current, the resistor changes from 155Ω (1.9V) to 140Ω (2.2V). Verify circuit compliance with the new resistor value.

Q: Are all substitute parts RoHS3 compliant?

A: SMTL2-URC, Everlight 67-21/R6C-AP2R1B/2T, and both Kingbright variants (AA3528SESK/J3 and AA3528SES/J3-AMT) are explicitly ROHS3 compliant. The original SMP2-URC RoHS status is not specified in available documentation.

Q: What is the difference between 2-PLCC and 2-SMD J-Lead packages?

A: Both are surface mount packages with identical 3.20mm x 2.80mm footprints and compatible PCB landing patterns. The 2-SMD J-Lead designation (Everlight 67-21/R6C-AP2R1B/2T) indicates a variant lead configuration but maintains mechanical and electrical compatibility with standard 2-PLCC designs. Verify PCB artwork compatibility with component supplier documentation.

Q: Which substitute offers the highest brightness rating?

A: The Kingbright AA3528SES/J3-AMT provides 650mcd brightness, closely matching the SMP2-URC's 700mcd rating. The AA3528SESK/J3 delivers 450mcd. Both operate at 2.2V forward voltage and require resistor recalculation.

Q: What is the moisture sensitivity implication of MSL 3 versus MSL 4?

A: MSL 4 (SMP2-URC and SMTL2-URC) allows 72-hour floor life before reflow soldering. MSL 3 (Kingbright and Everlight alternatives) allows 168-hour floor life. Lower MSL ratings provide extended handling windows in manufacturing environments. All components require proper storage in dry conditions per IPC-A-610 standards.

Q: Can 1411 (3528 Metric) package LEDs substitute for 2-PLCC designs?

A: No. The 1411 package (Everlight 67-21/R6C-FN2Q1BZ/2T and 67-21/RSC-FT2V1B/2T) has different mechanical dimensions (3.50mm L x 2.80mm W, 0.85mm height) and incompatible PCB footprints. These components are listed as similar alternatives only for applications where package redesign is acceptable.

Q: What inventory considerations apply to substitute selection?

A: SMTL2-URC offers 15,010 units in tape & reel stock. AA3528SESK/J3 provides 24,600 units. AA3528SES/J3-AMT has 1,102 units. Everlight 67-21/R6C-AP2R1B/2T contains 1,121 units. Inventory levels support volume production requirements for all recommended substitutes.

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