UCC28C40D Equivalent & Substitute Parts

Part Overview

The UCC28C40D is a Boost, Flyback, Forward Converter Regulator controller IC manufactured by Texas Instruments, designed for positive output step-up and step-up/step-down DC-DC conversion applications. This 8-SOIC surface mount device operates with a supply voltage range of 6.6V to 18V and supports switching frequencies up to 1MHz with a maximum duty cycle of 96%. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	UCC28C40D
Manufacturer	Texas Instruments
Package / Case	8-SOIC (0.154", 3.90mm Width)
Topology	Boost, Flyback, Forward Converter
Output Configuration	Positive
Voltage - Supply (Vcc/Vdd)	6.6V ~ 18V
Frequency - Switching	Up to 1MHz
Duty Cycle (Max)	96%
Operating Temperature	-40°C ~ 105°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the UCC28C40D is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — mandatory for mechanical and electrical compatibility
Topology: Boost, Flyback, Forward Converter or subset thereof
Output Configuration: Positive output capability
Duty Cycle (Max): 96% or greater
Output Type: Transistor Driver
Function: Step-Up, Step-Up/Step-Down capability
Number of Outputs: 1
Output Phases: 1
Synchronous Rectifier: No
Clock Sync: No
Control Features: Frequency Control

Secondary Compatibility Factors:

Voltage - Supply (Vcc/Vdd): Must accommodate the application's supply range
Frequency - Switching: Must support the required switching frequency
Operating Temperature: Must cover the application's thermal requirements
RoHS and REACH compliance status

Substitutes are grouped based on whether they meet all primary criteria while maintaining functional equivalence within the specified electrical operating window.

Parameter Comparison

Parameter	UCC28C40D	UCC28C40DR	UC2842BD1	UC2842BD1013TR	UC2843BD1	UC2843BD1013TR	UC3842BD1013TR	UC3843BD1	UC3843BD1013TR
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Topology	Boost, Flyback, Forward Converter	Boost, Flyback, Forward Converter	Boost, Flyback	Boost, Flyback	Boost, Flyback	Boost, Flyback	Boost, Flyback	Boost, Flyback	Boost, Flyback
Output Configuration	Positive	Positive	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable	Positive, Isolation Capable
Voltage - Supply (Vcc/Vdd)	6.6V ~ 18V	6.6V ~ 18V	10V ~ 30V	10V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	10V ~ 30V	7.6V ~ 30V	7.6V ~ 30V
Frequency - Switching	Up to 1MHz	Up to 1MHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz
Duty Cycle (Max)	96%	96%	96%	96%	96%	96%	96%	96%	96%
Operating Temperature	-40°C ~ 105°C (TJ)	-40°C ~ 105°C (TJ)	-25°C ~ 85°C (TA)	-25°C ~ 85°C (TA)	-25°C ~ 85°C (TA)	-25°C ~ 85°C (TA)	0°C ~ 70°C (TJ)	0°C ~ 70°C (TJ)	0°C ~ 70°C (TJ)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: UCC28C40DR

The UCC28C40DR is the manufacturer-recommended direct substitute for the obsolete UCC28C40D. Both parts are manufactured by Texas Instruments and share identical electrical specifications, including the 6.6V to 18V supply range, 1MHz switching frequency capability, and -40°C to 105°C operating temperature range. The UCC28C40DR is currently in active production status with significantly higher inventory availability (5456 pcs vs. 2236 pcs for the original part). Both parts maintain ROHS3 compliance and MSL 1 rating. The only difference is packaging format: UCC28C40D is supplied in Tube, while UCC28C40DR is supplied in Cut Tape (CT) & Digi-Reel format.

Secondary Substitutes: UC2843BD1013TR and UC3843BD1013TR

These STMicroelectronics parts provide functional equivalence for Boost and Flyback topologies with positive output configuration. Both support 96% maximum duty cycle and maintain ROHS3 compliance. However, they operate at reduced switching frequencies (up to 500kHz vs. 1MHz) and narrower operating temperature ranges (0°C to 70°C vs. -40°C to 105°C). These substitutes are suitable only for applications that do not require the full 1MHz switching capability or extended temperature operation of the original part. UC3843BD1013TR offers the highest inventory availability (5,000,200 pcs).

Alternative Substitutes: UC2842BD1013TR and UC3842BD1013TR

These parts support Boost and Flyback topologies with isolation capability. UC2842BD1013TR requires a minimum supply voltage of 10V (vs. 6.6V for the original), which may limit applicability in low-voltage designs. UC3842BD1013TR operates at 0°C to 70°C, further restricting thermal range. Both are limited to 500kHz switching frequency.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original UCC28C40D.

Frequently Asked Questions (FAQ)

Q: Can I directly replace UCC28C40D with UCC28C40DR?

A: Yes. The UCC28C40DR is the manufacturer-recommended direct substitute. Both parts are electrically and functionally identical, with the same supply voltage range (6.6V to 18V), switching frequency capability (up to 1MHz), duty cycle (96%), and operating temperature range (-40°C to 105°C). The only difference is packaging format: Tube versus Cut Tape & Digi-Reel. Pin configuration and electrical performance are identical.

Q: What are the key limitations when substituting with UC2843BD1013TR or UC3843BD1013TR?

A: These STMicroelectronics parts reduce switching frequency capability from 1MHz to 500kHz and narrow the operating temperature range from -40°C to 105°C to 0°C to 70°C. They are suitable only for applications that do not require full 1MHz operation or extended temperature performance. Supply voltage range is also expanded to 7.6V to 30V, which may affect designs optimized for the original 6.6V to 18V window.

Q: Why do some substitutes have higher supply voltage minimums?

A: UC2842 variants require a minimum of 10V supply, while UC2843 and UC3843 variants require 7.6V minimum. The original UCC28C40D operates from 6.6V. If your application requires operation below 7.6V, only the UCC28C40DR or UCC28C40D can be used. Higher minimum supply voltages reflect different internal circuit design and protection thresholds in the substitute parts.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory compliance of the original UCC28C40D.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: The original UCC28C40D and most substitutes carry MSL 1 (Unlimited), meaning they have no moisture sensitivity restrictions. UC2843BD1 and UC2843BD1013TR carry MSL 3 (168 Hours), requiring storage in dry conditions and limiting shelf life after moisture exposure. For applications with extended storage or high-humidity environments, MSL 1 parts are preferred.

Q: Can I use UC2842BD1 or UC2842BD1013TR in place of UCC28C40D?

A: These parts support Boost and Flyback topologies but lack Forward Converter capability. They also require a minimum 10V supply voltage compared to the original's 6.6V minimum. Use only if your application operates above 10V and does not require Forward Converter topology support.

Q: What packaging options are available for substitutes?

A: UCC28C40DR is available in Cut Tape (CT) & Digi-Reel format. UC2842BD1 is supplied in Tube. UC2842BD1013TR, UC2843BD1013TR, UC3842BD1013TR, and UC3843BD1013TR are supplied in Cut Tape (CT) & Digi-Reel format. All maintain the same 8-SOIC package footprint (0.154", 3.90mm Width).

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