UCD3138ARJAR Equivalent & Substitute Parts

Part Overview

The UCD3138ARJAR is a digital power controller manufactured by Texas Instruments, designed for power management applications requiring precise voltage regulation and control. This IC operates as a power supply controller in a 40-VQFN (6x6) surface mount package with an exposed pad. The device is currently in active production status with 2200 units available in inventory.

Finding equivalent and substitute parts becomes necessary when the primary component experiences supply constraints, extended lead times, or when design requirements permit functional alternatives that meet the same electrical and mechanical specifications.

Substiute Parts

UCD3138ARJAR

Texas InstrumentsIn Stock: 2225UCD3138ARJAR Datasheet

Current PartRFQ

S-8424AAAFT-TB-U

ABLIC Inc.In Stock: 5007S-8424AAAFT-TB-U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UCD3138ARJAR is determined by the following critical parameters:

Primary Substitution Criteria:

• Functional category: Power Management (PMIC) / Power Supply Controller
• Surface mount technology compatibility
• RoHS3 compliance status
• Operating temperature range capability
• Supply voltage specifications

The substitute part S-8424AAAFT-TB-U is identified as a manufacturer-recommended alternative. However, this substitute operates under different electrical specifications (input voltage range 1.7V ~ 16V versus 2.1V for the primary part) and uses a different package format (8-TSSOP versus 40-VQFN). These differences indicate that substitution is application-dependent and requires verification of circuit-level compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the UCD3138ARJAR and S-8424AAAFT-TB-U maintain active production status and comply with ROHS3 environmental standards. Both components are classified as unaffected by REACH regulations and carry EAR99 export classification.

The primary distinction between these parts lies in package format and pin count. The UCD3138ARJAR provides 40 pins in a VQFN package, while the S-8424AAAFT-TB-U offers 8 pins in a TSSOP package. This fundamental difference in pin configuration and package geometry means these components serve different circuit topologies and cannot be considered direct pin-for-pin replacements.

Selection between these parts must be based on specific circuit requirements, PCB layout constraints, and functional specifications of the target application. The operating temperature range of the UCD3138ARJAR extends to 125°C, while the S-8424AAAFT-TB-U is rated to 85°C maximum, which may be a limiting factor in high-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can the S-8424AAAFT-TB-U directly replace the UCD3138ARJAR on an existing PCB?

A: No. The S-8424AAAFT-TB-U uses an 8-TSSOP package with different pin assignments compared to the 40-VQFN package of the UCD3138ARJAR. PCB redesign and schematic modification would be required.

Q: What are the key electrical differences between these parts?

A: The UCD3138ARJAR specifies a 2.1V input voltage and 3V ~ 3.6V supply voltage range. The S-8424AAAFT-TB-U accepts input voltages from 1.7V ~ 16V, providing broader input voltage tolerance. The UCD3138ARJAR operates to 125°C, while the S-8424AAAFT-TB-U is limited to 85°C.

Q: Are both parts RoHS compliant?

A: Yes. Both the UCD3138ARJAR and S-8424AAAFT-TB-U are ROHS3 compliant and REACH unaffected.

Q: What is the difference in moisture sensitivity between these components?

A: The UCD3138ARJAR carries MSL 2 (1 Year), requiring storage in controlled humidity conditions for one year. The S-8424AAAFT-TB-U carries MSL 1 (Unlimited), indicating superior moisture resistance with no time-based storage restrictions.

Q: Which part should be selected for high-temperature applications?

A: The UCD3138ARJAR is suitable for applications requiring operation up to 125°C. The S-8424AAAFT-TB-U is limited to 85°C maximum operating temperature and would not be appropriate for high-temperature environments.