UCD3138ARMHT Equivalent & Substitute Parts

Part Overview

The UCD3138ARMHT is a digital power controller IC manufactured by Texas Instruments, designed for power supply applications requiring precise digital control. This component operates as a Power Supply Controller in a 40-WQFN (6x6) package with exposed pad configuration. The part is classified as Not For New Designs, indicating it has reached end-of-life status. Due to this product status, identifying functionally equivalent substitute components is essential for ongoing system support, maintenance, and legacy design continuity.

Substiute Parts

UCD3138ARMHT

Texas InstrumentsIn Stock: 1636UCD3138ARMHT Datasheet

Current PartRFQ

UCD3138ARJAR

Texas InstrumentsIn Stock: 2225UCD3138ARJAR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UCD3138ARMHT is determined by the following critical parameters:

• Voltage Specifications: Input voltage of 2.1V and supply voltage range of 3V ~ 3.6V
• Operating Temperature Range: -40°C ~ 125°C
• Package Configuration: 40-pin QFN format with exposed pad
• Functional Classification: Digital Power Controller application
• Compliance Standards: ROHS3 compliance and MSL rating of 2 (1 Year)
• Base Product Number: UCD3138 series compatibility

The substitute part UCD3138ARJAR shares the same base product number (UCD3138) and maintains identical electrical specifications across voltage input, supply voltage, and operating temperature parameters. The primary distinction lies in the package variant: UCD3138ARJAR uses a 40-VQFN (6x6) configuration instead of the 40-WQFN format of the main part. Both packages are 40-pin QFN variants with exposed pad designs, maintaining mechanical and thermal compatibility for surface mount applications.

Parameter Comparison

Engineering Selection Recommendations

The UCD3138ARJAR is the manufacturer-recommended substitute for the UCD3138ARMHT. Both components are manufactured by Texas Instruments and maintain identical electrical specifications for voltage input, supply voltage, and operating temperature parameters. The UCD3138ARJAR holds Active product status, ensuring continued availability and support compared to the Not For New Designs status of the main part.

Both parts maintain ROHS3 compliance and identical MSL ratings, confirming equivalent environmental and regulatory compliance. The package variant difference (WQFN versus VQFN) represents a standard QFN format variation within the same 40-pin, 6x6mm footprint family, both with exposed pad configurations suitable for surface mount assembly.

For applications currently using the UCD3138ARMHT, the UCD3138ARJAR provides direct functional equivalence with the added benefit of active product status and ongoing manufacturer support.

Frequently Asked Questions (FAQ)

Q: What is the primary reason for substituting the UCD3138ARMHT?

A: The UCD3138ARMHT carries a Not For New Designs product status, indicating end-of-life classification. The UCD3138ARJAR, with Active status, provides continued availability and manufacturer support for equivalent applications.

Q: Are the electrical specifications identical between UCD3138ARMHT and UCD3138ARJAR?

A: Yes. Both parts maintain identical voltage input (2.1V), supply voltage range (3V ~ 3.6V), and operating temperature range (-40°C ~ 125°C) specifications.

Q: What is the difference between the WQFN and VQFN package variants?

A: Both WQFN and VQFN are 40-pin QFN package formats with 6x6mm dimensions and exposed pad configurations. The letter designation indicates minor manufacturing or supplier variations within the same physical and electrical footprint family. Both are suitable for surface mount assembly.

Q: Are PCB layout modifications required when substituting UCD3138ARMHT with UCD3138ARJAR?

A: No PCB layout modifications are required. Both parts share identical 40-pin QFN footprints with exposed pad designs, maintaining mechanical and thermal compatibility.

Q: Do both parts meet the same compliance standards?

A: Yes. Both UCD3138ARMHT and UCD3138ARJAR are ROHS3 compliant with identical MSL ratings of 2 (1 Year), confirming equivalent environmental and regulatory compliance.

Q: Is the UCD3138ARJAR available in higher inventory quantities?

A: Yes. The UCD3138ARJAR has 2200 pieces in stock compared to 1613 pieces for the UCD3138ARMHT, providing improved availability for procurement.