MV57641 Red LED T-1 Diffused Equivalent & Substitute Parts

Part Overview

The MV57641 is a red diffused LED in T-1 through-hole package manufactured by onsemi. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The MV57641 serves as a red indication LED with a 2V forward voltage and 2.5mcd brightness rating, designed for standard through-hole mounting in indicator circuits.

Key Parameters

Parameter	MV57641 Specification
Manufacturer	onsemi
Color	Red
Lens Transparency	Diffused
Lens Size	3mm, T-1
Voltage - Forward (Vf) Typical	2V
Current - Test	10mA
Millicandela Rating	2.5mcd
Viewing Angle	90°
Wavelength - Peak	635nm
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	6.30mm
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MV57641 are grouped based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Color: Red
Lens Transparency: Diffused
Mounting Type: Through Hole
Package / Case: Radial
Lens Style: Round with Domed Top
Lens Size: 3mm or 3.10mm T-1 diameter

Secondary Electrical Parameters:

Voltage - Forward (Vf): 1.7V to 2.2V range
Current - Test: 10mA to 20mA range
Millicandela Rating: 2.5mcd to 330mcd range
Viewing Angle: 40° to 100° range
Wavelength - Peak: 620nm to 645nm range

Substitutes are valid when they maintain the same physical form factor (T-1 through-hole radial package), color, and lens transparency, with electrical parameters within acceptable operating ranges for the target application circuit.

Parameter Comparison

Part Number	Manufacturer	Color	Lens Transparency	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Wavelength - Peak	Height (Max)	Product Status	RoHS Status
MV57641	onsemi	Red	Diffused	2V	10mA	2.5mcd	90°	635nm	6.30mm	Obsolete	Not specified
3SRD-S	Bivar Inc.	Red	Diffused	1.7V	20mA	40mcd	40°	645nm	4.50mm	Active	ROHS3 Compliant
LTL-1CHE	Lite-On Inc.	Red	Diffused	2V	20mA	12.6mcd	60°	635nm	5.20mm	Active	ROHS3 Compliant
SLI-343U8R3F	Rohm Semiconductor	Red	Diffused	2.2V	20mA	220mcd	40°	Not specified	5.60mm	Active	ROHS3 Compliant
SLI-343U8RC3F	Rohm Semiconductor	Red	Clear	2.2V	20mA	330mcd	40°	Not specified	5.60mm	Active	ROHS3 Compliant
SLI-343V8R3F	Rohm Semiconductor	Red	Diffused	2.2V	20mA	330mcd	40°	Not specified	5.40mm	Active	ROHS3 Compliant
SLI-343V8RC3F	Rohm Semiconductor	Red	Diffused	2.2V	20mA	330mcd	40°	Not specified	5.60mm	Active	ROHS3 Compliant
SLR-332VR3F	Rohm Semiconductor	Red	Diffused	2V	10mA	10mcd	85°	Not specified	4.60mm	Not For New Designs	ROHS3 Compliant
SLR-343VR3F	Rohm Semiconductor	Red	Diffused	2V	10mA	16mcd	40°	Not specified	5.60mm	Active	ROHS3 Compliant
SSL-LX30FT14ID	Lumex Opto/Components Inc.	Red	Diffused	2V	20mA	10mcd	100°	635nm	6.00mm	Active	ROHS3 Compliant
SSL-LX30FT4ID	Lumex Opto/Components Inc.	Red	Diffused	2V	20mA	15mcd	100°	635nm	6.70mm	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

SLR-343VR3F and SLR-332VR3F from Rohm Semiconductor are the closest electrical matches, sharing the same 2V forward voltage and 10mA test current as the MV57641. Both are ROHS3 compliant and available in active product status. SLR-343VR3F provides 16mcd brightness with a 40° viewing angle, while SLR-332VR3F offers 10mcd with an 85° viewing angle. The SLR-332VR3F is marked "Not For New Designs" but remains suitable for replacement applications.

Active Production Alternatives:

SSL-LX30FT4ID and SSL-LX30FT14ID from Lumex maintain the 2V forward voltage and 635nm wavelength of the original part. Both are ROHS3 compliant and in active production status. These parts accept 20mA test current and provide wider viewing angles (100°) compared to the MV57641, making them suitable for applications requiring broader light distribution.

LTL-1CHE from Lite-On Inc. matches the 2V forward voltage and 635nm wavelength with 12.6mcd brightness. This part is ROHS3 compliant and actively produced, offering a mid-range brightness alternative.

Higher Brightness Options:

SLI-343U8R3F, SLI-343V8R3F, and SLI-343V8RC3F from Rohm Semiconductor (EXCELED™ series) provide significantly higher brightness (220mcd to 330mcd) at 2.2V forward voltage. These parts are ROHS3 compliant and in active production. The clear lens variant (SLI-343U8RC3F) delivers maximum brightness at 330mcd. These options are suitable for applications requiring enhanced visibility.

Lower Voltage Alternative:

3SRD-S from Bivar Inc. operates at 1.7V forward voltage with 40mcd brightness, offering the lowest voltage requirement among available substitutes. This part is ROHS3 compliant and actively produced, suitable for low-voltage circuit designs.

All substitute parts maintain through-hole radial mounting, T-1 form factor, and red diffused lens characteristics required for direct mechanical and electrical replacement.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different forward voltage?

A: Yes, within limits. The MV57641 operates at 2V. Substitutes ranging from 1.7V to 2.2V are electrically compatible with most standard indicator circuits. However, circuit design must account for voltage differences. Lower voltage parts (1.7V) reduce power dissipation, while higher voltage parts (2.2V) may require circuit adjustment. Verify your specific circuit design parameters before substitution.

Q: What is the difference between diffused and clear lens options?

A: Diffused lenses scatter light over a wider area with lower peak brightness, suitable for general indication. Clear lenses concentrate light for higher brightness in a narrower beam. The MV57641 uses a diffused lens. Substitutes with clear lenses (such as SLI-343U8RC3F) deliver higher millicandela ratings but narrower viewing angles. Select based on your application's visibility requirements and viewing angle needs.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant. The original MV57641 does not specify RoHS status. If your application requires RoHS compliance, all active production substitutes meet this requirement.

Q: What does "Not For New Designs" mean for SLR-332VR3F?

A: This designation indicates the part is in mature or declining production status but remains available for replacement and maintenance applications. It is not recommended for new product designs. For new designs, select from parts marked "Active" status, such as SLR-343VR3F, SSL-LX30FT4ID, or LTL-1CHE.

Q: How do I choose between substitutes with different brightness ratings?

A: Brightness (millicandela rating) depends on application requirements. The MV57641 provides 2.5mcd. Lower brightness substitutes (10mcd to 16mcd) are suitable for close-range indication. Higher brightness options (40mcd to 330mcd) are necessary for long-distance visibility or bright ambient conditions. Verify your circuit's current-limiting resistor design accommodates the selected part's test current (10mA or 20mA).

Q: Can I substitute a part with a different viewing angle?

A: Yes. The MV57641 has a 90° viewing angle. Substitutes range from 40° (narrow beam) to 100° (wide beam). Narrow angle parts (40°) concentrate light for directional indication, while wide angle parts (100°) provide visibility from multiple directions. Select based on your application's mounting position and required visibility pattern.

Q: What is the significance of wavelength specifications?

A: All parts are red LEDs with wavelengths between 620nm and 645nm, which are imperceptible differences to human vision. The MV57641 specifies 635nm peak wavelength. Substitutes with similar wavelengths (635nm) provide identical color appearance. Parts with slightly different wavelengths (620nm to 645nm) appear as the same red to the human eye and are functionally equivalent for indication purposes.

Q: Are there inventory considerations for substitute selection?

A: Yes. SSL-LX30FT4ID has the highest inventory (5,984 pcs), followed by SLI-343V8RC3F (10,045 pcs) and SLI-343U8R3F (25,153 pcs). If long-term availability is critical, these parts offer better supply security. The original MV57641 has 617 pcs in stock but is obsolete, making substitution necessary for future production.

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