LTW-M670ZVA Equivalent & Substitute Parts

Part Overview

The LTW-M670ZVA is a white LED indication component manufactured by Lite-On Inc., configured as a 3.3V discrete 2-SMD J-Lead surface mount device. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The component delivers 1300mcd at 20mA test current with a 120° viewing angle and is housed in a compact 2.70mm × 2.00mm × 1.30mm package.

Substiute Parts

LTW-M670ZVA

Lite-On Inc.In Stock: 1056LTW-M670ZVA Datasheet

Current PartRFQ

45-21UMC/3033429/TR8

Everlight Electronics Co LtdIn Stock: 110945-21UMC/3033429/TR8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTW-M670ZVA is determined by strict alignment across the following critical parameters:

• Package Configuration: 2-SMD, J-Lead surface mount form factor
• Physical Dimensions: 2.70mm L × 2.00mm W × 1.30mm H maximum
• Color & Lens: White LED with yellow lens
• Electrical Characteristics: Forward voltage (Vf) within acceptable tolerance range (3.2V–3.3V), test current 20mA
• Optical Performance: Viewing angle 120°, millicandela rating suitable for indication applications
• Mounting Type: Surface mount compatibility

The substitute part 45-21UMC/3033429/TR8 (Everlight Electronics Co Ltd) meets all critical substitution criteria within these defined parameters.

Parameter Comparison

Engineering Selection Recommendations

The 45-21UMC/3033429/TR8 qualifies as a direct substitute for the obsolete LTW-M670ZVA based on matching package geometry, electrical operating parameters, and optical specifications. The substitute part is currently in active production status, ensuring procurement availability and supply chain continuity.

The substitute exhibits a forward voltage of 3.2V compared to the main part's 3.3V—a 0.1V differential within acceptable tolerance for indication LED applications. The millicandela rating increases from 1300mcd to 1775mcd, providing enhanced brightness margin without compromising circuit compatibility.

The substitute part carries ROHS3 compliance certification and demonstrates improved moisture sensitivity (MSL 2 versus MSL 3), indicating superior handling and storage characteristics. These factors support long-term reliability in production environments.

Frequently Asked Questions (FAQ)

Q: Can the 45-21UMC/3033429/TR8 be used as a direct replacement in existing PCB designs?

A: Yes. The substitute part maintains identical package dimensions (2.70mm × 2.00mm × 1.30mm), J-Lead configuration, and mounting footprint. No PCB layout modifications are required.

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

A: The forward voltage differential (3.2V substitute versus 3.3V main part) falls within standard tolerance ranges for indication LED circuits. Series resistor values may require minor adjustment to maintain target brightness, but circuit functionality remains compatible.

Q: How does the diffused lens transparency affect optical performance?

A: The diffused lens on the substitute part provides wider light distribution compared to the main part's unspecified lens transparency. This characteristic is compatible with indication applications requiring uniform brightness across the viewing angle.

Q: What does MSL 2 versus MSL 3 mean for component handling?

A: MSL (Moisture Sensitivity Level) 2 allows 1 year of shelf life under controlled conditions, compared to MSL 3's 168-hour limit. The substitute part requires less stringent moisture control during storage and handling.

Q: Is the increased millicandela rating (1775mcd vs. 1300mcd) a concern?

A: No. Higher brightness provides design margin and does not create compatibility issues. If brightness reduction is required, series resistor adjustment can be implemented.