QTLP670C4TR Green 2-PLCC LED Equivalent & Substitute Parts

Part Overview

The QTLP670C4TR is a green surface-mount LED manufactured by Everlight Electronics Co Ltd, designed for indication applications with a dominant wavelength of 570nm and a forward voltage of 2.1V at 20mA test current. This component features a 2.40mm diameter round lens with flat top in a 2-PLCC package configuration.

The QTLP670C4TR is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this LED specification.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	QTLP670C4TR	—
Manufacturer	Everlight Electronics Co Ltd	—
Color	Green	—
Wavelength - Dominant	570	nm
Wavelength - Peak	565	nm
Voltage - Forward (Vf) Typical	2.1	V
Current - Test	20	mA
Millicandela Rating	25	mcd
Lens Size	2.40	mm Dia
Lens Style	Round with Flat Top	—
Lens Transparency	Clear	—
Viewing Angle	120	°
Package / Case	2-PLCC	—
Mounting Type	Surface Mount	—
Size / Dimension	3.20 x 2.80	mm L x W
Height (Max)	2.10	mm
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	3 (168 Hours)	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitute parts for the QTLP670C4TR are identified based on strict alignment with the following critical parameters:

Primary Substitution Criteria:

Color: Green
Package / Case: 2-PLCC
Mounting Type: Surface Mount
Lens Size: 2.40mm Dia (or compatible)
Lens Style: Round with Flat Top
Lens Transparency: Clear
Viewing Angle: 120°
Size / Dimension: 3.20mm L x 2.80mm W
Height (Max): 2.10mm
RoHS Status: ROHS3 Compliant

Secondary Compatibility Parameters:

Voltage - Forward (Vf) Typical: 2.0V to 2.2V range
Current - Test: 20mA
Wavelength - Dominant: 560nm to 570nm range
Wavelength - Peak: 560nm to 570nm range
Millicandela Rating: 20mcd to 30mcd range

Substitute parts meeting all primary criteria and falling within secondary parameter ranges are classified as direct parametric equivalents. Parts with variations in secondary parameters are noted for specific application compatibility assessment.

Parameter Comparison

Parameter	QTLP670C4TR (Main)	AA3528SGS	QBLP670-YG1	SML-LX2832GC-TR	SML-LX2832SGC-TR	VFHG1104LS-TR	HSMG-A100-H01J1	AA3528ZGSK
Manufacturer	Everlight	Kingbright	QT Brightek	Lumex	Lumex	Stanley Electric	Broadcom	Kingbright
Color	Green	Green	Green	Green	Green	Green	Green	Green
Wavelength - Dominant (nm)	570	568	570	—	—	561	569	525
Wavelength - Peak (nm)	565	565	—	565	565	561	565	515
Voltage - Forward (Vf) Typical (V)	2.1	2.2	2.1	2.1	2.1	2.0	2.2	3.3
Current - Test (mA)	20	20	20	20	20	20	20	20
Millicandela Rating (mcd)	25	25	28	25	28	25	8	500
Lens Size (mm Dia)	2.40	2.40	2.40	2.40	2.40	2.40	2.20	2.40
Lens Style	Round with Flat Top	Round with Flat Top	Round with Flat Top	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	Clear	Clear	Clear
Viewing Angle (°)	120	120	120	120	120	120	120	120
Package / Case	2-PLCC	2-PLCC	2-PLCC	2-PLCC	2-PLCC	2-PLCC	2-PLCC	2-PLCC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Size / Dimension (mm L x W)	3.20 x 2.80	3.20 x 2.80	3.20 x 2.80	3.20 x 2.80	3.20 x 2.80	3.20 x 2.80	3.20 x 2.80	3.20 x 2.80
Height (Max) (mm)	2.10	2.10	2.10	2.10	2.10	2.10	2.10	2.10
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	2 (1 Year)	2A (4 Weeks)	2A (4 Weeks)	3 (168 Hours)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Parametric Equivalents (Highest Compatibility):

The following parts meet all primary substitution criteria and operate within the secondary parameter ranges established for the QTLP670C4TR:

AA3528SGS (Kingbright) — Active product status. Forward voltage 2.2V, millicandela rating 25mcd, wavelength dominant 568nm. MSL 3 (168 Hours). Identical mechanical and optical specifications.
QBLP670-YG1 (QT Brightek) — Active product status. Forward voltage 2.1V, millicandela rating 28mcd, wavelength dominant 570nm. MSL 3 (168 Hours). Identical to main part specifications with minor brightness variation.
SML-LX2832GC-TR (Lumex Opto/Components Inc.) — Active product status. Forward voltage 2.1V, millicandela rating 25mcd, wavelength peak 565nm. MSL 3 (168 Hours). Identical electrical and mechanical specifications.
SML-LX2832SGC-TR (Lumex Opto/Components Inc.) — Active product status. Forward voltage 2.1V, millicandela rating 28mcd, wavelength peak 565nm. MSL 2 (1 Year). Enhanced moisture sensitivity rating.

Compatible Substitutes (Secondary Parameter Variations):

VFHG1104LS-TR (Stanley Electric Co) — Active product status. Forward voltage 2.0V, millicandela rating 25mcd, wavelength dominant 561nm. MSL 2A (4 Weeks). Operates within acceptable voltage range with slightly shorter wavelength.
HSMG-A100-H01J1 (Broadcom Limited) — Active product status. Forward voltage 2.2V, millicandela rating 8mcd, lens size 2.20mm Dia. MSL 2A (4 Weeks). Reduced brightness output; lens diameter variation requires mechanical clearance verification.

Not Recommended for Direct Substitution:

AA3528ZGSK (Kingbright) — Active product status. Forward voltage 3.3V, millicandela rating 500mcd, wavelength dominant 525nm. Significant deviations in voltage, brightness, and wavelength place this part outside acceptable substitution parameters for the QTLP670C4TR application.

Frequently Asked Questions (FAQ)

Q1: Can I use AA3528SGS as a direct replacement for QTLP670C4TR?

A: Yes. AA3528SGS meets all primary substitution criteria: identical 2-PLCC package, 2.40mm lens diameter, 3.20 x 2.80mm footprint, 2.10mm maximum height, 120° viewing angle, and clear lens. Forward voltage is 2.2V (within 0.1V tolerance of the main part), and millicandela rating is identical at 25mcd. Both are ROHS3 compliant. The part is currently in active production status.

Q2: What is the difference between SML-LX2832GC-TR and SML-LX2832SGC-TR?

A: Both parts are manufactured by Lumex and share identical electrical specifications (2.1V forward voltage, 20mA test current, 2-PLCC package). The primary difference is the Moisture Sensitivity Level: SML-LX2832GC-TR is rated MSL 3 (168 Hours), while SML-LX2832SGC-TR is rated MSL 2 (1 Year). The SGC variant provides superior moisture protection during storage and handling. Millicandela ratings differ slightly: GC-TR is 25mcd, SGC-TR is 28mcd.

Q3: Why is AA3528ZGSK not suitable as a substitute?

A: AA3528ZGSK operates at 3.3V forward voltage, which is 1.2V higher than the QTLP670C4TR specification of 2.1V. Additionally, the millicandela rating is 500mcd compared to 25mcd for the main part, and the dominant wavelength is 525nm versus 570nm. These parameters fall outside acceptable substitution ranges and would require circuit redesign for proper operation.

Q4: Can HSMG-A100-H01J1 be used in applications with space constraints?

A: HSMG-A100-H01J1 has a lens diameter of 2.20mm compared to 2.40mm for the QTLP670C4TR. While the overall package footprint (3.20 x 2.80mm) and height (2.10mm) remain identical, the reduced lens size may affect optical performance and viewing characteristics. Additionally, the millicandela rating is 8mcd, significantly lower than the 25mcd of the main part. Mechanical clearance and optical performance must be verified for specific applications.

Q5: What does MSL rating mean for LED component selection?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before soldering without risk of moisture-induced failure. MSL 3 allows 168 hours of exposure, while MSL 2 allows 4 weeks. Lower MSL numbers indicate better moisture resistance. For the QTLP670C4TR, MSL 3 is specified. Substitutes with MSL 2 or 2A provide enhanced protection during storage and handling.

Q6: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant, matching the compliance status of the QTLP670C4TR. This ensures compatibility with environmental regulations and procurement requirements.

Q7: What is the significance of wavelength dominant versus wavelength peak?

A: Wavelength dominant is the primary emission wavelength perceived by the human eye and is the specification used for color classification. Wavelength peak is the absolute maximum of the LED's spectral output curve. For green LEDs, the QTLP670C4TR specifies dominant wavelength 570nm and peak wavelength 565nm. Substitute parts with dominant wavelengths between 560nm and 570nm are considered equivalent for indication applications.

Q8: Can I substitute QBLP670-YG1 if my design requires exactly 25mcd brightness?

A: QBLP670-YG1 is rated at 28mcd, which is 3mcd higher than the 25mcd specification of the QTLP670C4TR. For applications with strict brightness requirements, this 12% increase may be significant. However, for standard indication applications, this variation is typically acceptable. If exact brightness matching is required, AA3528SGS or SML-LX2832GC-TR are preferred alternatives, both rated at 25mcd.

Q9: What packaging options are available for substitute parts?

A: All substitute parts are supplied in 2-PLCC package configuration. Packaging formats vary by supplier: AA3528SGS and AA3528ZGSK are supplied in Tape & Reel (TR) format; QBLP670-YG1, SML-LX2832GC-TR, and SML-LX2832SGC-TR are supplied in Tape & Reel (TR) format; VFHG1104LS-TR is supplied in Tape & Reel (TR) format; HSMG-A100-H01J1 is supplied in Cut Tape (CT) & Digi-Reel® format. Verify packaging compatibility with assembly equipment before procurement.

Q10: Which substitute part has the best long-term availability?

A: Current inventory levels indicate HSMG-A100-H01J1 (Broadcom) has the highest stock at 25,400 pieces, followed by AA3528ZGSK (Kingbright) at 18,825 pieces, and AA3528SGS (Kingbright) at 15,219 pieces. However, product status is the primary indicator of long-term availability. All substitute parts except the main QTLP670C4TR are classified as Active, indicating ongoing production and supply continuity.

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