UCD3138ARMHR Equivalent & Substitute Parts

Part Overview

The UCD3138ARMHR is a digital power controller IC manufactured by Texas Instruments, designed for power supply applications requiring precise digital control. This device is classified as a Power Management IC (PMIC) and operates within a 3V to 3.6V supply voltage range with an input voltage tolerance of 2.1V minimum. The component is currently marked as "Not For New Designs," which necessitates identification of functionally equivalent alternatives for ongoing production and new development initiatives.

Substiute Parts

UCD3138ARMHR

Texas InstrumentsIn Stock: 1605UCD3138ARMHR Datasheet

Current PartRFQ

UCD3138ARJAR

Texas InstrumentsIn Stock: 2225UCD3138ARJAR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UCD3138ARMHR is determined by the following critical parameters:

• Manufacturer and Base Product Number: Both the main part and substitute must originate from Texas Instruments and share the UCD3138 base product designation to ensure functional equivalence.
• Supply Voltage Range: Substitute parts must operate within the identical 3V to 3.6V supply voltage specification.
• Input Voltage Tolerance: Minimum input voltage of 2.1V must be maintained.
• Operating Temperature Range: The -40°C to 125°C operating window must be preserved.
• Package Configuration: The 40-pin QFN package with exposed pad is the primary mechanical constraint; variations in QFN subtype (WQFN vs. VQFN) are acceptable provided pin count and pitch remain constant.
• Compliance Standards: RoHS3 compliance and REACH unaffected status must be maintained.

The UCD3138ARJAR qualifies as a direct substitute based on these parameters, sharing identical electrical specifications and compliance certifications while utilizing a compatible 40-VQFN package variant.

Parameter Comparison

Engineering Selection Recommendations

The UCD3138ARJAR is the qualified substitute for the UCD3138ARMHR based on the following engineering criteria:

• Functional Equivalence: Both parts share the UCD3138 base product number and maintain identical electrical specifications across supply voltage, input voltage, and operating temperature ranges.
• Product Status Advantage: The UCD3138ARJAR carries an "Active" product status designation, making it suitable for new design implementations, whereas the UCD3138ARMHR is restricted from new designs.
• Compliance Alignment: Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility in target applications.
• Package Compatibility: The transition from 40-WFQFN to 40-VFQFN represents a compatible package variant within the same 6x6 mm footprint, requiring no PCB layout modifications.
• Moisture Sensitivity Consistency: Identical MSL ratings ensure equivalent handling and storage requirements.

Selection of the UCD3138ARJAR eliminates obsolescence risk while preserving all critical electrical and mechanical parameters required for digital power controller applications.

Frequently Asked Questions (FAQ)

Q: Can the UCD3138ARJAR be used as a direct replacement for the UCD3138ARMHR in existing designs?

A: Yes. Both parts share identical supply voltage (3V ~ 3.6V), input voltage (2.1V minimum), operating temperature range (-40°C ~ 125°C), and functional specifications. The package variant change from WFQFN to VFQFN does not affect electrical performance or PCB compatibility within the 6x6 mm footprint.

Q: What is the primary reason for substituting the UCD3138ARMHR?

A: The UCD3138ARMHR is designated "Not For New Designs," indicating end-of-life status. The UCD3138ARJAR maintains active product status while delivering identical electrical performance, making it the appropriate choice for both legacy support and new development.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the UCD3138ARMHR and UCD3138ARJAR maintain ROHS3 compliance, REACH unaffected status, and identical moisture sensitivity levels (MSL 2, 1 Year), ensuring equivalent regulatory and environmental qualification.

Q: What is the difference between the WFQFN and VFQFN package variants?

A: Both are 40-pin QFN packages with 6x6 mm dimensions and exposed pads. The letter designation (W vs. V) indicates minor manufacturing process variations that do not affect electrical characteristics, pin configuration, or PCB footprint compatibility.

Q: Is inventory availability a factor in the substitution decision?

A: Inventory levels are provided for reference only. The UCD3138ARJAR currently has 2200 units in stock compared to 1499 units of the UCD3138ARMHR. However, substitution decisions should be based on product status and electrical equivalence rather than inventory fluctuations.