UCC38C45P Equivalent & Substitute Parts

Part Overview

The UCC38C45P is a Power Management IC (PMIC) manufactured by Texas Instruments, functioning as a multi-topology DC-DC controller for boost, flyback, and forward converter applications. This component operates as a transistor driver with positive output configuration, supporting step-up and step-up/step-down topologies. The UCC38C45P is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute components must maintain functional compatibility across topology support, output characteristics, and electrical operating parameters.

Substiute Parts

UCC38C45P

Texas InstrumentsIn Stock: 1512UCC38C45P Datasheet

Current PartRFQ

MIC38C44YN

Microchip TechnologyIn Stock: 1491MIC38C44YN Datasheet

MFR RecommendedRFQ

MIC38C45YN

Microchip TechnologyIn Stock: 1256MIC38C45YN Datasheet

MFR RecommendedRFQ

UC3845BNG

onsemiIn Stock: 2536UC3845BNG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UCC38C45P is determined by the following critical parameters:

Primary Compatibility Criteria:

• Package / Case: 8-DIP (0.300", 7.62mm) form factor
• Mounting Type: Through Hole
• Output Type: Transistor Driver
• Topology Support: Boost and Flyback converter capability (minimum requirement)
• Output Configuration: Positive output
• Control Features: Frequency Control
• RoHS Compliance: ROHS3 Compliant

Electrical Operating Range:

• Voltage - Supply (Vcc/Vdd): Minimum 7.6V support required
• Duty Cycle (Max): 48% or greater
• Frequency - Switching: 500kHz or higher capability

All three substitute parts meet these core criteria while maintaining functional equivalence for boost and flyback topologies. Differences in supply voltage range, switching frequency capability, and operating temperature reflect design variations across manufacturers but do not preclude substitution when application requirements fall within the specified operating windows.

Parameter Comparison

Engineering Selection Recommendations

MIC38C45YN (Microchip Technology) is the primary recommended substitute for the UCC38C45P. This part maintains active product status, supports all required topologies (boost, flyback, forward converter), and provides identical 8-DIP package compatibility. The MIC38C45YN extends the supply voltage range to 7.6V ~ 20V and offers synchronous rectifier capability. Operating temperature range of -40°C ~ 85°C accommodates broader environmental conditions than the original part. ROHS3 compliance and MSL 1 rating ensure regulatory and manufacturing compatibility.

UC3845BNG (onsemi) serves as an alternative substitute with active product status. This component supports boost and flyback topologies with identical package form factor and mounting type. The UC3845BNG provides the widest supply voltage range (7.6V ~ 30V) among all options, offering design flexibility for applications with variable input voltage requirements. Operating temperature range matches the original UCC38C45P specification (0°C ~ 70°C). ROHS3 compliance is confirmed.

MIC38C44YN (Microchip Technology) is suitable for applications requiring buck topology support in addition to boost and flyback functionality. This part features the widest operating temperature range (-40°C ~ 150°C) and supports supply voltages from 9V ~ 20V. The 500kHz switching frequency and 50% duty cycle provide adequate performance for standard converter designs. ROHS3 compliance and MSL 1 rating are maintained.

All three substitutes are currently in active production status, ensuring long-term availability and supply chain stability compared to the obsolete UCC38C45P.

Frequently Asked Questions (FAQ)

Q: Can the MIC38C45YN directly replace the UCC38C45P in existing designs?

A: Yes, the MIC38C45YN provides direct functional replacement for boost, flyback, and forward converter topologies. Both components share identical 8-DIP package geometry, through-hole mounting, and transistor driver output configuration. Pin-level compatibility must be verified against specific application schematics, as controller ICs typically require application-specific external component networks.

Q: What is the primary difference between MIC38C44YN and MIC38C45YN?

A: The MIC38C44YN supports buck topology in addition to boost, flyback, and forward converters, while the MIC38C45YN is optimized for boost, flyback, and forward topologies. The MIC38C44YN operates at 500kHz fixed frequency, whereas the MIC38C45YN supports frequency control. For applications requiring only boost and flyback functionality, the MIC38C45YN is the more direct equivalent.

Q: Why does the UC3845BNG have a wider supply voltage range (7.6V ~ 30V) compared to the UCC38C45P (7.6V ~ 18V)?

A: The UC3845BNG is designed with a broader input voltage tolerance to accommodate diverse application requirements. Applications operating within the UCC38C45P's original 7.6V ~ 18V window will function identically with the UC3845BNG. The extended upper limit provides additional design flexibility for systems with higher input voltage sources.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all three substitute parts (MIC38C44YN, MIC38C45YN, and UC3845BNG) are ROHS3 compliant, matching the regulatory status of the original UCC38C45P. All components are also REACH unaffected and classified under ECCN EAR99.

Q: What is the significance of the 8-DIP package specification?

A: The 8-DIP (0.300", 7.62mm) package is a through-hole dual inline package with 0.3-inch row spacing. All substitute parts maintain this identical package geometry, ensuring direct PCB footprint compatibility without layout modifications. This standardized package format is critical for retrofit applications and legacy design continuity.

Q: Does switching frequency difference affect substitution suitability?

A: The UCC38C45P supports up to 1MHz switching frequency, while substitute parts operate at 500kHz maximum. For applications designed to operate at 500kHz or lower, substitution is fully compatible. Applications requiring 1MHz operation may require circuit redesign or alternative component selection. Verify application frequency requirements before substitution.

Q: What is the operating temperature consideration for each substitute?

A: The UCC38C45P and UC3845BNG both specify 0°C ~ 70°C operating range. The MIC38C45YN extends to -40°C ~ 85°C, and the MIC38C44YN to -40°C ~ 150°C. For applications operating within 0°C ~ 70°C, all substitutes are suitable. For extended temperature applications, the Microchip options provide enhanced thermal performance.