MT7303A-UR-A Equivalent & Substitute Parts

Part Overview

The MT7303A-UR-A is a red LED indication component manufactured by Marktech Optoelectronics, featuring a 3mm round through-hole package with clear lens. This Active status product delivers 200mcd at 1.9V forward voltage with a 643nm dominant wavelength and 35° viewing angle. Substitute parts are necessary to address inventory availability, lead time constraints, or specific application requirements while maintaining functional compatibility within the electrical and mechanical parameters of this product category.

Key Parameters

Parameter	MT7303A-UR-A
Manufacturer	Marktech Optoelectronics
Color	Red
Lens Transparency	Clear
Lens Size	3.00mm Dia
Voltage - Forward (Vf) (Typ)	1.9V
Current - Test	20mA
Millicandela Rating	200mcd
Wavelength - Dominant	643nm
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	6.10mm
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria applied strictly to the provided parameters:

Primary Compatibility Criteria:

Color: Red (all substitutes must be red)
Mounting Type: Through Hole (all substitutes must be through-hole radial)
Lens Transparency: Clear (preferred for optical consistency)
Lens Size: 3.00mm or 3.10mm diameter (mechanical fit tolerance)
Voltage - Forward (Vf): 1.7V to 2.05V (circuit compatibility range)
Current - Test: 20mA nominal (standard test current)
Wavelength - Dominant: 624nm to 643nm (red spectrum range)

Secondary Considerations:

Millicandela Rating: 65mcd to 880mcd (brightness variation acceptable based on application)
Viewing Angle: 22° to 45° (application-dependent)
Height (Max): 5.20mm to 6.55mm (PCB layout tolerance)
Product Status: Active (all listed substitutes are active)
RoHS/REACH Compliance: All substitutes meet or exceed compliance requirements

The following parts meet substitution criteria and are grouped by electrical and mechanical compatibility:

Group A - High Brightness, Clear Lens (200mcd+): HLMP-Y601-J0000, HLMP-Y651-G0000, LTL42EKEKNN, LTL1CHKEKNN, LTL1CHKRKNN

Group B - Medium Brightness, Clear Lens (65mcd-160mcd): HLMP-K105, HLMP-K105-J0002

Group C - Low Brightness, Clear Lens (<65mcd): HLMP-K155

Group D - Diffused Lens: 151031SS04000

Parameter Comparison

Part Number	Manufacturer	Color	Lens Transparency	Lens Size	Vf (Typ)	Current - Test	mcd	Wavelength - Dominant	Viewing Angle	Height (Max)	RoHS Status
MT7303A-UR-A	Marktech Optoelectronics	Red	Clear	3.00mm	1.9V	20mA	200mcd	643nm	35°	6.10mm	RoHS Compliant
151031SS04000	Würth Elektronik	Red	Diffused	3.00mm	2V	20mA	160mcd	635nm	40°	5.55mm	ROHS3 Compliant
HLMP-K105	Broadcom Limited	Red	Clear	3mm, T-1	1.8V	20mA	65mcd	637nm	45°	6.35mm	ROHS3 Compliant
HLMP-K105-J0002	Broadcom Limited	Red	Clear	3mm, T-1	1.8V	20mA	65mcd	637nm	45°	6.35mm	ROHS3 Compliant
HLMP-K155	Broadcom Limited	Red	Clear	3mm, T-1	1.7V	1mA	3mcd	640nm	45°	6.35mm	ROHS3 Compliant
HLMP-Y601-J0000	Broadcom Limited	Red	Clear	3mm, T-1	2V	20mA	680mcd	627nm	45°	5.20mm	ROHS3 Compliant
HLMP-Y651-G0000	Broadcom Limited	Red	Clear	3mm, T-1	2V	20mA	300mcd	638nm	45°	5.20mm	ROHS3 Compliant
LTL1CHKEKNN	Lite-On Inc.	Red	Clear	3.10mm	2.05V	20mA	680mcd	624nm	45°	5.20mm	ROHS3 Compliant
LTL1CHKRKNN	Lite-On Inc.	Red	Clear	3.10mm	2V	20mA	400mcd	631nm	45°	5.20mm	ROHS3 Compliant
LTL42EKEKNN	Lite-On Inc.	Red	Clear	3mm, T-1	2.05V	20mA	880mcd	624nm	22°	6.55mm	ROHS3 Compliant
SLR-343VC3F	Rohm Semiconductor	Red	Clear	3.10mm	2V	10mA	25mcd	630nm	40°	5.60mm	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Electrical Compatibility (1.8V to 2V Forward Voltage, 20mA Test Current):

HLMP-K105 and HLMP-K105-J0002 provide the closest electrical match with 1.8V forward voltage. The primary difference is packaging: HLMP-K105 is supplied in Bulk, while HLMP-K105-J0002 is supplied in Cut Tape (CT). Both are ROHS3 Compliant with unlimited MSL rating. Brightness is reduced to 65mcd compared to the original 200mcd.

HLMP-Y601-J0000 and HLMP-Y651-G0000 operate at 2V forward voltage with higher brightness ratings (680mcd and 300mcd respectively). Both are ROHS3 Compliant with unlimited MSL. These are suitable where increased brightness is acceptable.

For High Brightness Applications (>200mcd):

LTL42EKEKNN delivers 880mcd at 2.05V with a narrower 22° viewing angle. Height is 6.55mm. REACH Status is Affected.

LTL1CHKEKNN and LTL1CHKRKNN provide 680mcd and 400mcd respectively at 2.05V and 2V. Both feature 3.10mm lens diameter and 5.20mm height. LTL1CHKRKNN has REACH Status Affected.

For Diffused Lens Applications:

151031SS04000 from Würth Elektronik is the only diffused lens option, operating at 2V with 160mcd brightness and 40° viewing angle. ROHS3 Compliant with unlimited MSL.

For Low Brightness Indicator Applications:

HLMP-K155 operates at 1.7V with only 3mcd brightness and 1mA test current. Suitable for low-power indicator circuits.

SLR-343VC3F from Rohm Semiconductor operates at 2V with 25mcd and 10mA test current. ROHS3 Compliant with unlimited MSL.

Compliance Considerations:

All substitute parts are ROHS3 Compliant or RoHS Compliant. The original MT7303A-UR-A is RoHS Compliant (RoHS 2). Most substitutes have unlimited MSL (1 Year) compared to the original's 2-year MSL. LTL42EKEKNN and LTL1CHKRKNN have REACH Status Affected, while the original is REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can HLMP-K155 replace MT7303A-UR-A in all applications?

A: HLMP-K155 operates at 1.7V with only 3mcd brightness and 1mA test current, compared to the original's 1.9V, 200mcd, and 20mA. This part is suitable only for low-power indicator applications where reduced brightness is acceptable. Circuit redesign may be required.

Q: What is the difference between HLMP-K105 and HLMP-K105-J0002?

A: Both parts are electrically identical (1.8V, 65mcd, 20mA, 637nm). The difference is packaging: HLMP-K105 is supplied in Bulk, while HLMP-K105-J0002 is supplied in Cut Tape (CT). Inventory availability differs significantly (2,300 pcs vs. 20,739 pcs).

Q: Why does LTL42EKEKNN have a narrower viewing angle (22°) compared to the original (35°)?

A: LTL42EKEKNN is designed for focused beam applications with higher brightness (880mcd). The narrower 22° viewing angle is a direct result of the optical design that concentrates light output. This part is suitable only where concentrated illumination is required.

Q: Can I use 151031SS04000 as a direct replacement?

A: 151031SS04000 has a diffused lens, whereas MT7303A-UR-A has a clear lens. The diffused lens scatters light over a wider area, affecting optical performance. This part is suitable only if diffused illumination is acceptable in the application.

Q: What is the impact of forward voltage differences on circuit design?

A: The original operates at 1.9V. Substitutes range from 1.7V to 2.05V. Series resistor values in current-limiting circuits must be recalculated based on the substitute's forward voltage to maintain 20mA test current. A 0.15V difference requires resistor adjustment of approximately 7.5 ohms per milliamp of desired current.

Q: Are all substitutes RoHS compliant?

A: Yes. The original is RoHS Compliant (RoHS 2). All substitutes are ROHS3 Compliant, which exceeds RoHS 2 requirements. REACH compliance varies: most substitutes are REACH Unaffected, but LTL42EKEKNN and LTL1CHKRKNN have REACH Status Affected.

Q: Which substitute offers the closest brightness match?

A: HLMP-Y651-G0000 at 300mcd is the closest brightness match above the original 200mcd. For brightness below the original, HLMP-K105 at 65mcd is the next option. For higher brightness, LTL42EKEKNN at 880mcd and LTL1CHKEKNN at 680mcd are available.

Q: What is the mechanical fit consideration for 3.10mm lens diameter parts?

A: The original has a 3.00mm lens diameter. Substitutes with 3.10mm diameter (151031SS04000, LTL1CHKEKNN, LTL1CHKRKNN, SLR-343VC3F) have a 0.10mm larger diameter. This is within standard mechanical tolerance for 3mm through-hole mounting but should be verified in the specific PCB design.

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