UCC28C40P Equivalent & Substitute Parts

Part Overview

The UCC28C40P is a DC-DC controller IC manufactured by Texas Instruments, designed for boost, flyback, and forward converter topologies with positive output configuration. This 8-PDIP through-hole component operates as a transistor driver for step-up and step-up/step-down applications. The UCC28C40P is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. Substitute parts must maintain functional compatibility across topology support, output configuration, and electrical operating parameters while accommodating different packaging formats.

Substiute Parts

UCC28C40P

Texas InstrumentsIn Stock: 6308UCC28C40P Datasheet

Current PartRFQ

UCC28C40D

Texas InstrumentsIn Stock: 2279UCC28C40D Datasheet

MFR RecommendedRFQ

UC2842BN

STMicroelectronicsIn Stock: 2676UC2842BN Datasheet

MFR RecommendedRFQ

UC2843BN

STMicroelectronicsIn Stock: 20539UC2843BN Datasheet

MFR RecommendedRFQ

UC3842BN

STMicroelectronicsIn Stock: 55131UC3842BN Datasheet

MFR RecommendedRFQ

UC3843BN

STMicroelectronicsIn Stock: 60377UC3843BN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UCC28C40P are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Output Type: Transistor Driver
• Function: Step-Up, Step-Up/Step-Down capability
• Topology Support: Boost and Flyback (minimum requirement)
• Output Configuration: Positive
• Number of Outputs: 1
• Duty Cycle (Max): 96%
• RoHS3 Compliance

Packaging Considerations:

• UCC28C40D: Surface mount alternative (8-SOIC) from the same manufacturer, maintaining identical electrical specifications
• UC2842BN, UC2843BN, UC3842BN, UC3843BN: Through-hole alternatives (8-DIP) from STMicroelectronics with compatible topologies and output configurations

Electrical Parameter Ranges: Substitutes must support the required voltage supply range and switching frequency specifications. Variations in supply voltage range and maximum switching frequency are acceptable provided they encompass or match the application requirements.

Parameter Comparison

Engineering Selection Recommendations

UCC28C40D (Texas Instruments): Direct electrical equivalent to UCC28C40P with identical specifications. Differs only in package format (8-SOIC surface mount versus 8-PDIP through hole). Maintains obsolete product status. Select this substitute when PCB layout accommodates surface-mount technology and design requires exact electrical performance match.

UC2842BN (STMicroelectronics): Active product with through-hole 8-DIP packaging matching the UCC28C40P form factor. Supports boost and flyback topologies with positive output configuration. Supply voltage range extends to 30V maximum. Switching frequency limited to 500kHz. Operating temperature range -25°C to 85°C. ROHS3 compliant. Select for through-hole designs requiring an active product with extended supply voltage capability.

UC2843BN (STMicroelectronics): Active product with through-hole 8-DIP packaging. Supports boost and flyback topologies with positive output configuration. Supply voltage range 7.6V to 30V. Switching frequency up to 500kHz. Operating temperature range -25°C to 85°C. ROHS3 compliant. Select when lower minimum supply voltage (7.6V) is advantageous compared to UC2842BN (10V minimum).

UC3842BN (STMicroelectronics): Active product with through-hole 8-DIP packaging. Supports boost and flyback topologies with positive output configuration. Supply voltage range 10V to 30V. Switching frequency up to 500kHz. Operating temperature range 0°C to 70°C. ROHS3 compliant. Select for applications with narrower operating temperature requirements and higher supply voltage tolerance.

UC3843BN (STMicroelectronics): Active product with through-hole 8-DIP packaging. Supports boost and flyback topologies with positive output configuration. Supply voltage range 7.6V to 30V. Switching frequency up to 500kHz. Operating temperature range 0°C to 70°C. ROHS3 compliant. Select when combining lower minimum supply voltage (7.6V) with narrower operating temperature range (0°C to 70°C).

Frequently Asked Questions (FAQ)

Q: Can UCC28C40D replace UCC28C40P in existing designs? A: UCC28C40D provides electrical equivalence with identical specifications. Substitution requires PCB redesign to accommodate 8-SOIC surface-mount package instead of 8-PDIP through-hole format. Pin configuration and electrical function remain compatible.

Q: What are the key differences between UCC28C40P and STMicroelectronics alternatives? A: STMicroelectronics parts (UC2842BN, UC2843BN, UC3842BN, UC3843BN) are active products with identical topology support and output configuration. Primary differences include reduced maximum switching frequency (500kHz versus 1MHz), extended supply voltage range (up to 30V), and different operating temperature ranges. All maintain 96% maximum duty cycle and ROHS3 compliance.

Q: Which substitute is best for through-hole PCB assembly? A: UC2842BN, UC2843BN, UC3842BN, and UC3843BN all use 8-DIP through-hole packaging matching UCC28C40P form factor. Selection depends on specific supply voltage and operating temperature requirements. UC2843BN and UC3843BN offer lower minimum supply voltage (7.6V) compared to UC2842BN and UC3842BN (10V minimum).

Q: Are all substitutes ROHS3 compliant? A: All listed substitutes maintain ROHS3 compliance, matching the UCC28C40P environmental standard.

Q: What is the impact of reduced switching frequency in STMicroelectronics alternatives? A: STMicroelectronics parts support up to 500kHz switching frequency compared to UCC28C40P at 1MHz. Applications designed for 500kHz or lower switching frequencies experience no functional impact. Designs requiring 1MHz operation must use UCC28C40D or remain with original UCC28C40P inventory.

Q: Can UC2843BN or UC3843BN operate at the UCC28C40P minimum supply voltage of 6.6V? A: No. UC2843BN and UC3843BN specify minimum supply voltage of 7.6V. Applications requiring 6.6V operation must use UCC28C40P or UCC28C40D. UC2842BN and UC3842BN require minimum 10V supply voltage.

Q: What is the difference between UC2842BN and UC2843BN? A: Both are STMicroelectronics active products with identical topology support, output configuration, and duty cycle. UC2843BN operates at lower minimum supply voltage (7.6V versus 10V). Operating temperature range is identical (-25°C to 85°C). Select UC2843BN for applications with lower supply voltage requirements.

Q: What is the difference between UC3842BN and UC3843BN? A: Both are STMicroelectronics active products with identical topology support and output configuration. UC3843BN operates at lower minimum supply voltage (7.6V versus 10V). UC3842BN and UC3843BN both specify narrower operating temperature range (0°C to 70°C) compared to UC2842BN and UC2843BN (-25°C to 85°C). Select UC3843BN for applications combining lower supply voltage with narrower temperature range.