UCD3138RMHT Equivalent & Substitute Parts

Part Overview

The UCD3138RMHT is a digital power controller IC manufactured by Texas Instruments, designed for power supply management applications. It is packaged in a 40-WQFN (6x6) configuration with exposed pad and operates within a supply voltage range of 3V to 3.6V. The device is classified as not for new designs, indicating its legacy status in the product lifecycle. Identifying equivalent substitute parts is necessary for applications requiring continued supply, design flexibility, or inventory optimization while maintaining functional and electrical compatibility.

Substiute Parts

UCD3138RMHT

Texas InstrumentsIn Stock: 1216UCD3138RMHT Datasheet

Current PartRFQ

UCD3138RJAT

Texas InstrumentsIn Stock: 17842UCD3138RJAT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UCD3138RMHT is determined by strict alignment of the following electrical and mechanical parameters:

• Base product number (UCD3138 series)
• Supply voltage range (3V ~ 3.6V)
• Supply current specification (100 mA)
• Operating temperature range (-40°C ~ 125°C)
• Surface mount configuration
• RoHS3 compliance and MSL rating
• Package family compatibility (40-pin QFN with exposed pad)

The UCD3138RJAT qualifies as a direct substitute based on identical electrical specifications and compliance certifications. The primary distinction lies in the package designation (VQFN versus WQFN), which represents a variation within the same 40-pin QFN family and does not affect functional compatibility for applications meeting the specified electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

The UCD3138RJAT is the qualified substitute for the UCD3138RMHT based on the following engineering criteria:

• All electrical specifications are identical, including supply voltage, current, and operating temperature range
• Both devices maintain ROHS3 compliance and identical MSL ratings, ensuring equivalent environmental and regulatory compatibility
• The UCD3138RJAT carries an Active product status, providing continued manufacturer support and availability, whereas the UCD3138RMHT is designated not for new designs
• Package compatibility is maintained within the 40-pin QFN family, with both configurations featuring exposed pads suitable for thermal management
• Inventory availability of the UCD3138RJAT (17,804 pcs) significantly exceeds that of the UCD3138RMHT (1,184 pcs), supporting supply chain continuity

Selection of the UCD3138RJAT is appropriate for applications requiring sustained component availability and manufacturer support while maintaining full functional equivalence.

Frequently Asked Questions (FAQ)

Q: What is the primary difference between UCD3138RMHT and UCD3138RJAT?

A: The devices are electrically identical. The suffix designation indicates a package variation within the 40-pin QFN family (WQFN versus VQFN). Both configurations feature exposed pads and meet identical electrical and thermal specifications.

Q: Can UCD3138RJAT be used as a direct replacement in existing designs?

A: Yes. The UCD3138RJAT meets all electrical, thermal, and compliance requirements of the UCD3138RMHT. PCB layout compatibility should be verified due to potential minor package footprint variations between WQFN and VQFN designations.

Q: Why is the UCD3138RMHT marked as not for new designs?

A: This designation indicates the device is in the legacy phase of its product lifecycle. Texas Instruments recommends the UCD3138RJAT for new applications requiring this functionality.

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

A: No. Both devices are ROHS3 compliant, carry identical MSL ratings, and share the same REACH and ECCN classifications.

Q: What supply voltage range do these devices support?

A: Both the UCD3138RMHT and UCD3138RJAT operate with a supply voltage range of 3V to 3.6V and draw a maximum supply current of 100 mA.

Q: Are there inventory considerations when selecting between these parts?

A: The UCD3138RJAT has significantly higher inventory availability (17,804 pcs versus 1,184 pcs), making it the preferred choice for supply chain reliability and lead time assurance.