FLD00042 Equivalent & Substitute Parts

Part Overview

The FLD00042 is an optical sensor manufactured by onsemi, designed for ambient light detection at 640nm wavelength with I2C digital output. This component operates within a 2.4V to 3.6V supply range and is housed in an 8-WDFN surface mount package. The product is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

FLD00042

onsemiIn Stock: 889FLD00042 Datasheet

Current PartRFQ

LTR-301

Lite-On Inc.In Stock: 269158LTR-301 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution analysis for the FLD00042 is constrained by the following critical parameters: optical wavelength (640nm), output interface type (I2C), supply voltage range (2.4V ~ 3.6V), and mounting configuration (surface mount, 8-WDFN package).

The identified substitute, LTR-301, is a phototransistor-based optical sensor from Lite-On Inc. This component operates at 940nm wavelength with through-hole radial mounting. Substitution between these parts requires careful evaluation of wavelength compatibility, output signal type differences, and mechanical mounting constraints. The LTR-301 represents an alternative optical sensing solution but operates under fundamentally different electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The FLD00042 is an obsolete component with active product status limited to existing inventory. The LTR-301 is currently in active production status, providing long-term availability for new designs and ongoing support applications.

Selection between these components must account for the following engineering constraints:

Wavelength difference (640nm versus 940nm) affects optical response characteristics and light source compatibility. The FLD00042 operates with I2C digital output, while the LTR-301 functions as an analog phototransistor requiring signal conditioning and analog-to-digital conversion. Mounting architecture differs fundamentally: the FLD00042 uses surface mount technology in an 8-WDFN package, while the LTR-301 employs through-hole radial construction. Supply voltage specifications are incompatible without additional circuit design modifications.

Both components maintain REACH compliance and EAR99 export classification. The LTR-301 provides superior moisture resistance (MSL 1 versus MSL 3) and extended operating temperature range (-40°C to 85°C versus -30°C to 70°C).

Frequently Asked Questions (FAQ)

Q: Can the LTR-301 directly replace the FLD00042 in existing circuit designs?

A: Direct replacement is not feasible. The components differ in output signal type (digital I2C versus analog phototransistor), mounting technology (surface mount versus through-hole), and wavelength response (640nm versus 940nm). Circuit redesign is required for substitution.

Q: What are the primary compatibility constraints between these optical sensors?

A: The critical constraints are output interface type, wavelength specification, supply voltage requirements, and mechanical mounting configuration. The FLD00042 provides integrated I2C digital output at 640nm, while the LTR-301 requires external signal conditioning for analog phototransistor output at 940nm.

Q: Does the LTR-301 offer improved reliability compared to the FLD00042?

A: The LTR-301 maintains active product status with superior moisture sensitivity rating (MSL 1 versus MSL 3) and extended operating temperature range. These specifications indicate enhanced environmental performance characteristics.

Q: Are both components compliant with current regulatory requirements?

A: Both components maintain REACH compliance and EAR99 export classification. The LTR-301 additionally carries ROHS3 certification.

Q: What packaging considerations apply to these optical sensors?

A: The FLD00042 uses surface mount 8-WDFN packaging suitable for automated assembly and compact PCB layouts. The LTR-301 employs through-hole radial construction, requiring different PCB footprint design and manual or selective soldering processes.