UCC28C45MDREP Equivalent & Substitute Parts

Part Overview

The UCC28C45MDREP is a Power Supply Controller PWM Controller manufactured by Texas Instruments in an 8-SOIC package. This device functions as a multi-topology PWM controller for power management applications. The part is currently Active in product status with 3300 units in stock. Substitute parts are identified based on matching electrical specifications, package compatibility, and functional equivalence in PWM control topologies.

Key Parameters

Parameter	UCC28C45MDREP
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply	7.6V ~ 18V
Current - Supply	2.3 mA
Operating Temperature	-55°C ~ 125°C (TA)
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the UCC28C45MDREP are qualified based on the following criteria:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct PCB footprint compatibility.

Electrical Specifications: Substitute parts must operate within overlapping supply voltage ranges and support PWM control functionality. The UCC28C45MDREP operates at 7.6V ~ 18V supply voltage; substitute parts with supply ranges of 7.6V ~ 30V, 8.2V ~ 25V, or 10V ~ 25V are compatible for applications within the 7.6V ~ 18V window.

Frequency and Duty Cycle: All qualified substitutes support switching frequencies up to 500kHz and duty cycle specifications compatible with multi-topology PWM control.

Compliance and Status: All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and active or recently active product status to ensure availability and regulatory alignment.

Topology Support: Substitute parts include PWM controllers supporting buck, boost, and flyback topologies with frequency control features.

Parameter Comparison

Part Number	Manufacturer	Package	Voltage - Supply (V)	Frequency - Switching (kHz)	Duty Cycle (Max)	Operating Temperature (°C)	Product Status	Inventory (Pcs)
UCC28C45MDREP	Texas Instruments	8-SOIC	7.6 ~ 18	—	—	-55 ~ 125	Active	3300
UC2845BD1R2G	onsemi	8-SOIC	7.6 ~ 30	Up to 500	48	-25 ~ 85	Active	45200
LT1241CS8#PBF	Analog Devices Inc.	8-SOIC	8.2 ~ 25	500	48	0 ~ 100	Active	1305
LT1241IS8#PBF	Analog Devices Inc.	8-SOIC	8.2 ~ 25	500	48	-40 ~ 100	Active	1737
LT1243CS8#PBF	Analog Devices Inc.	8-SOIC	8.2 ~ 25	500	96	0 ~ 100	Active	1227
LT1244IS8#PBF	Analog Devices Inc.	8-SOIC	10 ~ 25	Up to 500	48	-40 ~ 100	Active	2000
LT1245CS8#PBF	Analog Devices Inc.	8-SOIC	8.2 ~ 25	500	48	0 ~ 100	Active	1310
LT1245IS8#PBF	Analog Devices Inc.	8-SOIC	8.2 ~ 25	500	48	-40 ~ 100	Active	903
UC2845BD1G	onsemi	8-SOIC	7.6 ~ 30	Up to 500	48	-25 ~ 85	Obsolete	1178

Engineering Selection Recommendations

Primary Substitutes (Active Status): UC2845BD1R2G from onsemi and LT1241IS8#PBF from Analog Devices Inc. are recommended as primary substitutes. Both parts maintain Active product status, ROHS3 compliance, and MSL Level 1 rating. UC2845BD1R2G offers the highest inventory availability (45200 units) and extended supply voltage range (7.6V ~ 30V). LT1241IS8#PBF provides extended operating temperature range (-40°C ~ 100°C) suitable for industrial applications.

Extended Temperature Range: For applications requiring operation below -25°C, LT1241IS8#PBF and LT1244IS8#PBF support -40°C minimum operating temperature, compared to the UCC28C45MDREP's -55°C specification. These parts are suitable for most commercial and industrial environments.

Higher Duty Cycle Applications: LT1243CS8#PBF supports 96% maximum duty cycle, compared to 48% in most alternatives, enabling different converter topologies and control characteristics.

Obsolete Parts: UC2845BD1G is marked Obsolete and should be avoided for new designs despite functional equivalence. Prioritize Active status parts for long-term supply chain reliability.

Compliance Verification: All recommended substitutes maintain ROHS3 compliance and MSL Level 1 rating, ensuring regulatory alignment and moisture handling compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can UC2845BD1R2G directly replace UCC28C45MDREP in existing designs?

A: Yes, UC2845BD1R2G is a direct package and functional equivalent. Both use 8-SOIC packaging and support PWM control with up to 500kHz switching frequency. The supply voltage range of UC2845BD1R2G (7.6V ~ 30V) encompasses the UCC28C45MDREP range (7.6V ~ 18V), ensuring compatibility for applications within the original specification window.

Q: What is the difference between LT1241CS8#PBF and LT1241IS8#PBF?

A: Both parts are functionally identical buck regulators in 8-SOIC packaging with 500kHz switching frequency and 48% maximum duty cycle. The primary difference is operating temperature range: LT1241CS8#PBF operates 0°C ~ 100°C, while LT1241IS8#PBF operates -40°C ~ 100°C. Select LT1241IS8#PBF for extended low-temperature applications.

Q: Why is UC2845BD1G listed as Obsolete?

A: UC2845BD1G is marked Obsolete by the manufacturer, indicating discontinued production. Although functionally equivalent to UCC28C45MDREP, new designs should use Active status alternatives such as UC2845BD1R2G to ensure long-term availability and supply chain continuity.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the regulatory and handling requirements of the UCC28C45MDREP.

Q: What is the inventory advantage of UC2845BD1R2G?

A: UC2845BD1R2G has 45200 units in stock, significantly higher than UCC28C45MDREP (3300 units) and other alternatives. This availability advantage supports high-volume production and reduces lead time risk.

Q: Can LT1243CS8#PBF be used in applications designed for UCC28C45MDREP?

A: LT1243CS8#PBF is compatible for package and basic PWM control function. However, it supports 96% maximum duty cycle compared to standard 48% specifications. Verify that the higher duty cycle does not conflict with your converter topology and control requirements before substitution.

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