ASMF-LWG4-NRUCD Equivalent & Substitute Parts

Part Overview

The ASMF-LWG4-NRUCD is a warm white LED (3500K) manufactured by Broadcom Limited in a 1212 (3030 Metric) surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and design requirements. The part delivers 28lm at 65mA test current with a forward voltage of 2.9V and 120° viewing angle, suitable for general illumination applications requiring warm color temperature lighting.

Key Parameters

Parameter	Value
Manufacturer Part Number	ASMF-LWG4-NRUCD
Manufacturer	Broadcom Limited
Product Status	Obsolete
Color	White, Warm
CCT (K)	3500K
Flux @ 25°C, 65mA	28lm (24lm ~ 32lm)
Forward Voltage (Vf)	2.9V
Test Current	65mA
Maximum Current	240mA
Viewing Angle	120°
Package / Case	1212 (3030 Metric)
Mounting Type	Surface Mount
CRI (Color Rendering Index)	80
RoHS Status	ROHS3 Compliant
MSL (Moisture Sensitivity Level)	3 (168 Hours)

Substitute Part Grouping Explanation

The ASMF-LWG8-NSVCD qualifies as a direct substitute for the ASMF-LWG4-NRUCD based on the following critical parameters:

Color temperature match: Both parts are warm white 3500K LEDs
Package compatibility: Both use 1212 (3030 Metric) surface mount package
Electrical compatibility: Test current remains 65mA; maximum current is 240mA for both
Viewing angle: Both maintain 120° viewing angle
Compliance alignment: Both are ROHS3 compliant with MSL 3 (168 Hours)
Thermal characteristics: Both have thermal resistance specifications within acceptable operating ranges

The primary distinction is product status: ASMF-LWG8-NSVCD is active production, whereas ASMF-LWG4-NRUCD is obsolete. Forward voltage differs slightly (2.8V vs 2.9V), and luminous flux output is marginally higher in the substitute part (30lm vs 28lm at test current).

Parameter Comparison

Parameter	ASMF-LWG4-NRUCD (Main)	ASMF-LWG8-NSVCD (Substitute)
Manufacturer	Broadcom Limited	Broadcom Limited
Product Status	Obsolete	Active
Color	White, Warm	White, Warm
CCT (K)	3500K	3500K
Flux @ 25°C, Test Current	28lm (24lm ~ 32lm)	30lm (Typ)
Forward Voltage (Vf) Typ	2.9V	2.8V
Test Current	65mA	65mA
Maximum Current	240mA	240mA
Lumens/Watt @ Test Current	149 lm/W	162 lm/W
CRI (Color Rendering Index)	80	80
Viewing Angle	120°	120°
Package / Case	1212 (3030 Metric)	1212 (3030 Metric)
Mounting Type	Surface Mount	Surface Mount
Size / Dimension	0.118" L x 0.118" W (3.00mm x 3.00mm)	0.118" L x 0.118" W (3.00mm x 3.00mm)
Height - Seated (Max)	0.031" (0.80mm)	0.031" (0.80mm)
Thermal Resistance of Package	15°C/W	10°C/W
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
MSL (Moisture Sensitivity Level)	3 (168 Hours)	3 (168 Hours)
ECCN	EAR99	EAR99
HTSUS	8541.41.0000	8541.41.0000

Engineering Selection Recommendations

The ASMF-LWG8-NSVCD is the appropriate substitute for the obsolete ASMF-LWG4-NRUCD. Both parts maintain identical compliance certifications (ROHS3, EAR99, HTSUS 8541.41.0000) and moisture sensitivity specifications. The substitute part is in active production status, ensuring supply chain continuity and long-term availability.

The ASMF-LWG8-NSVCD demonstrates improved thermal performance (10°C/W vs 15°C/W) and higher luminous efficacy (162 lm/W vs 149 lm/W). Forward voltage is 0.1V lower (2.8V vs 2.9V), which may require minor circuit adjustments in current-limiting designs but remains within typical LED operating tolerances. The luminous flux increase (30lm vs 28lm) is within the tolerance band of the original part and represents improved performance.

Frequently Asked Questions (FAQ)

Q: Can ASMF-LWG8-NSVCD be used as a direct drop-in replacement for ASMF-LWG4-NRUCD?

A: Yes. Both parts share identical package dimensions (1212/3030 Metric), mounting type (surface mount), test current (65mA), maximum current (240mA), viewing angle (120°), and color temperature (3500K). PCB footprints are compatible without modification.

Q: What is the impact of the 0.1V forward voltage difference?

A: The ASMF-LWG8-NSVCD operates at 2.8V versus 2.9V for the original part. In constant-current driver circuits, this difference is absorbed by the current-limiting resistor or active driver and does not affect circuit function. In voltage-limited designs, verify that the lower forward voltage does not cause excessive current draw.

Q: Does the improved thermal resistance (10°C/W vs 15°C/W) require design changes?

A: No. The lower thermal resistance of the substitute part is advantageous, reducing junction temperature at equivalent power dissipation. Existing thermal designs remain valid and may operate at lower temperatures.

Q: Are there packaging differences between these parts?

A: The main part (ASMF-LWG4-NRUCD) is supplied in standard packaging, while the substitute (ASMF-LWG8-NSVCD) is supplied in Tape & Reel (TR) format. Both are suitable for automated assembly. Tape & Reel packaging is standard for high-volume production.

Q: What is the significance of the higher luminous efficacy in the substitute part?

A: The ASMF-LWG8-NSVCD delivers 162 lm/W compared to 149 lm/W for the original part. This represents improved energy efficiency and higher light output at equivalent current levels, providing design flexibility for brightness optimization.

Q: Are compliance certifications identical?

A: Yes. Both parts are ROHS3 compliant, carry EAR99 export classification, and share the same HTSUS code (8541.41.0000). Moisture sensitivity level is identical at MSL 3 (168 Hours). No compliance re-qualification is required.

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