MV8B12 Blue LED T-1 3/4 Through Hole - Equivalent & Substitute Parts

Part Overview

The MV8B12 is an obsolete blue LED indication component manufactured by onsemi, featuring a 5mm T-1 3/4 through-hole package with a clear domed lens. This discrete radial LED operates at 3.8V forward voltage with a 20mA test current and delivers 940mcd luminous intensity at a 10° viewing angle. The component is designed for standard LED indication applications requiring blue wavelength output at 430nm peak wavelength.

Due to the obsolete product status of the MV8B12, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Key Parameters

Parameter	MV8B12 Specification
Color	Blue
Lens Transparency	Clear
Lens Size	5mm, T-1 3/4
Voltage - Forward (Vf) Typical	3.8V
Current - Test	20mA
Millicandela Rating	940mcd
Viewing Angle	10°
Mounting Type	Through Hole
Package / Case	Radial
Wavelength - Peak	430nm
Height (Max)	8.90mm
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MV8B12 is determined by the following critical parameters:

Primary Compatibility Criteria:

Color: Blue
Lens Transparency: Clear
Mounting Type: Through Hole
Package / Case: Radial
Current - Test: 20mA
Lens Size: 5mm or 5mm T-1 3/4

Secondary Compatibility Criteria:

Voltage - Forward (Vf): Range 2.7V to 3.8V (acceptable variance for indication applications)
Millicandela Rating: 940mcd minimum (brightness equivalence or improvement)
Viewing Angle: 10° to 45° (acceptable for standard indication use)
Height (Max): 8.70mm to 8.90mm (mechanical fit within standard PCB clearances)

Substitute parts are grouped into two categories based on these parameters:

Category A - Direct Mechanical & Electrical Equivalents (T-1 3/4 Package): Parts maintaining identical T-1 3/4 package geometry, 5mm lens size, and compatible forward voltage within the 3.1V to 3.8V range. These parts are suitable for direct socket replacement with minimal circuit redesign.

Category B - Functional Equivalents (5mm Round Package): Parts with 5mm round lens geometry and compatible electrical characteristics. These require PCB layout verification due to potential height variations but maintain full functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Color	Lens Size	Vf (Typ)	mcd Rating	Viewing Angle	Height (Max)	Product Status	RoHS Status
MV8B12	onsemi	Blue	5mm, T-1 3/4	3.8V	940mcd	10°	8.90mm	Obsolete	Not Specified
151053BS04500	Würth Elektronik	Blue	5.00mm Dia	2.7V	2000mcd	45°	8.85mm	Active	ROHS3 Compliant
5219946F	Dialight	Blue	5.00mm Dia	3.8V	1010mcd	30°	8.70mm	Active	ROHS3 Compliant
HLMP-CB1A-XY0DD	Broadcom Limited	Blue	5mm, T-1 3/4	3.2V	9600mcd	15°	8.90mm	Active	ROHS3 Compliant
HLMP-CB1B-XY0DD	Broadcom Limited	Blue	5mm, T-1 3/4	3.2V	9600mcd	15°	13.21mm	Active	ROHS3 Compliant
HLMP-CB2A-VW0DD	Broadcom Limited	Blue	5mm, T-1 3/4	3.2V	5700mcd	23°	8.90mm	Active	ROHS3 Compliant
HLMP-CB2B-VW0DD	Broadcom Limited	Blue	5mm, T-1 3/4	3.2V	5700mcd	23°	12.57mm	Active	ROHS3 Compliant
HLMP-CB2G-UW0DD	Broadcom Limited	Blue	5mm, T-1 3/4	3.1V	5200mcd	23°	8.90mm	Active	ROHS3 Compliant
HLMP-CB3A-UV0DD	Broadcom Limited	Blue	5mm, T-1 3/4	3.2V	4350mcd	30°	8.90mm	Active	ROHS3 Compliant
HLMP-CB3B-UV0DD	Broadcom Limited	Blue	5mm, T-1 3/4	3.2V	4350mcd	30°	12.25mm	Active	ROHS3 Compliant
HLMP-CB3G-TV0DD	Broadcom Limited	Blue	5mm, T-1 3/4	3.1V	4000mcd	30°	8.90mm	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement:

HLMP-CB2A-VW0DD (Broadcom Limited) is the optimal direct replacement for the MV8B12. This part maintains identical T-1 3/4 package geometry, matching 8.90mm maximum height, and operates within compatible forward voltage range (3.2V vs. 3.8V original). The 5700mcd rating exceeds the original 940mcd specification, providing improved brightness margin. ROHS3 compliance and active product status ensure long-term availability and regulatory alignment.

Secondary Recommendation - Brightness-Optimized Replacement:

HLMP-CB1A-XY0DD (Broadcom Limited) provides the highest luminous intensity at 9600mcd while maintaining T-1 3/4 package compatibility and 8.90mm height. Forward voltage of 3.2V is within acceptable operating range. This selection is appropriate for applications requiring enhanced visibility or where the original 940mcd specification was marginal.

Alternative Recommendation - Wider Viewing Angle:

HLMP-CB3A-UV0DD (Broadcom Limited) offers 30° viewing angle compared to the original 10°, suitable for applications requiring broader light distribution. T-1 3/4 package, 8.90mm height, and 4350mcd rating maintain mechanical and electrical compatibility.

Functional Equivalent - 5mm Round Package:

5219946F (Dialight) provides exact forward voltage match (3.8V) and comparable brightness (1010mcd). This part uses standard 5mm round package geometry with 8.70mm height. Selection requires PCB layout verification to confirm mechanical clearance compatibility.

All recommended substitutes carry ROHS3 compliance and active product status, ensuring regulatory compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can HLMP-CB1A-XY0DD be used as a direct drop-in replacement for MV8B12?

A: Yes. Both parts use T-1 3/4 package geometry with identical 8.90mm maximum height. Forward voltage differs by 0.6V (3.2V vs. 3.8V), which is acceptable for LED indication circuits. Series resistor values may require adjustment to maintain original brightness levels due to the 9600mcd rating versus 940mcd original specification.

Q: What is the key difference between HLMP-CB2A-VW0DD and HLMP-CB2B-VW0DD?

A: Both parts are electrically identical with 5700mcd brightness and 3.2V forward voltage. The primary difference is physical height: HLMP-CB2A-VW0DD measures 8.90mm maximum height (matching MV8B12), while HLMP-CB2B-VW0DD measures 12.57mm. For direct replacement applications, HLMP-CB2A-VW0DD is preferred to maintain original PCB clearance specifications.

Q: Can I use 151053BS04500 (Würth Elektronik) as a replacement?

A: 151053BS04500 is functionally compatible but requires circuit redesign consideration. Forward voltage is significantly lower at 2.7V compared to 3.8V original, requiring resistor recalculation. The 5mm round package differs from T-1 3/4 geometry, necessitating PCB layout verification. Brightness of 2000mcd exceeds original specification. This part is suitable only when PCB layout modifications are acceptable.

Q: What does the viewing angle difference mean for substitution?

A: Viewing angle defines the cone of light emission. MV8B12 has 10° viewing angle (narrow, focused beam), while HLMP-CB3A-UV0DD has 30° (wider distribution). Narrower angles concentrate light intensity in a specific direction; wider angles distribute light across a broader area. Selection depends on application requirements for light distribution pattern.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification. The original MV8B12 (obsolete) does not specify RoHS status. All active substitutes meet current environmental and regulatory requirements for new production applications.

Q: What is the significance of "Active" product status for substitutes?

A: Active product status indicates the part is currently manufactured and available through distribution channels. This ensures long-term supply availability, ongoing manufacturer support, and compliance with current industry standards. The obsolete status of MV8B12 makes active substitutes essential for production continuity.

Q: Can HLMP-CB2G-UW0DD replace HLMP-CB2A-VW0DD?

A: Yes, with minor considerations. Both parts share identical T-1 3/4 package, 8.90mm height, and 23° viewing angle. Forward voltage differs slightly (3.1V vs. 3.2V), and brightness is marginally lower (5200mcd vs. 5700mcd). This substitution is acceptable where the minor brightness reduction is tolerable.

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