UCC2813N-2 Equivalent & Substitute Parts

Part Overview

The UCC2813N-2 is an offline switch controller IC manufactured by Texas Instruments, designed for boost, flyback, and forward converter topologies operating at 1MHz. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The UCC2813N-2 operates with a supply voltage range of 8.3V to 12V and supports a 99% duty cycle, making it suitable for offline power conversion applications requiring high efficiency and flexible topology support.

Substiute Parts

UCC2813N-2

Texas InstrumentsIn Stock: 646UCC2813N-2 Datasheet

Current PartRFQ

UCC2813D-2

UnitrodeIn Stock: 5193UCC2813D-2 Datasheet

MFR RecommendedRFQ

UC2842BN

STMicroelectronicsIn Stock: 2676UC2842BN Datasheet

MFR RecommendedRFQ

UC2843BN

STMicroelectronicsIn Stock: 20539UC2843BN Datasheet

MFR RecommendedRFQ

UC2845BN

STMicroelectronicsIn Stock: 2001UC2845BN Datasheet

MFR RecommendedRFQ

UC3842BN

STMicroelectronicsIn Stock: 55131UC3842BN Datasheet

MFR RecommendedRFQ

UC3843BN

STMicroelectronicsIn Stock: 60377UC3843BN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the UCC2813N-2 is determined by the following critical parameters:

Primary Substitution Criteria:

• Topology support (Boost, Flyback, Forward)
• Switching frequency capability (1MHz or compatible)
• Supply voltage range compatibility (8.3V ~ 12V minimum overlap)
• Duty cycle support (99% or higher)
• Package type (8-DIP through-hole preferred for direct replacement)
• Control features (Frequency Control)

Substitution Groups:

Group 1: Direct Package Equivalent

• UCC2813D-2: Same base part number, surface-mount alternative (8-SOIC package). Identical electrical specifications but different mounting technology.

Group 2: Compatible Topology Controllers

• UC2842BN, UC2843BN, UC2845BN, UC3842BN, UC3843BN: All support boost and flyback topologies with frequency control. These parts operate at switching frequencies up to 500kHz and maintain compatible supply voltage ranges and duty cycle capabilities within acceptable engineering margins.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Package): UCC2813D-2 is the primary equivalent, maintaining identical electrical specifications and base part number. This part is active and ROHS3 compliant, providing continuity for through-hole designs requiring surface-mount conversion.

For Active Production Designs: UC2843BN and UC3843BN are recommended substitutes. Both support the required boost and flyback topologies with frequency control, operate within compatible supply voltage ranges (7.6V ~ 30V encompasses the original 8.3V ~ 12V requirement), and are actively manufactured by STMicroelectronics with ROHS3 compliance. UC2843BN offers extended operating temperature range (-25°C ~ 85°C) suitable for industrial applications, while UC3843BN provides 0°C ~ 70°C operation.

For Extended Temperature Applications: UC2845BN supports the full temperature range (-40°C ~ 150°C) matching the original part's thermal specifications. Note that UC2845BN has a maximum duty cycle of 48%, which differs from the original 99%, requiring circuit design verification for forward converter topologies.

Compliance Considerations: All recommended substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original part. Moisture sensitivity level remains at MSL 1 (Unlimited) across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can UC2842BN directly replace UCC2813N-2? A: UC2842BN supports boost and flyback topologies with frequency control and 8-DIP through-hole packaging. However, its supply voltage range (10V ~ 30V) has a higher minimum than the original (8.3V), and maximum duty cycle is 96% versus 99%. Circuit validation is required for applications operating below 10V or requiring 99% duty cycle.

Q: What is the difference between UCC2813N-2 and UCC2813D-2? A: UCC2813D-2 is the surface-mount equivalent (8-SOIC package) with identical electrical specifications. Both share the same base part number and support the same topologies, switching frequency, and supply voltage range. Selection depends on PCB assembly technology requirements.

Q: Why do UC2843BN and UC3843BN have different operating temperature ranges? A: UC2843BN operates at -25°C ~ 85°C (TA), while UC3843BN operates at 0°C ~ 70°C (TJ). These represent different temperature measurement points and thermal specifications. UC2843BN is suitable for wider industrial temperature ranges, while UC3843BN is optimized for standard commercial applications.

Q: Is UC2845BN suitable for forward converter applications? A: UC2845BN supports forward topology but has a maximum duty cycle of 48%, compared to the original 99%. Forward converter designs operating above 48% duty cycle require circuit redesign or alternative part selection.

Q: Are all substitute parts ROHS3 compliant? A: Yes. UCC2813D-2, UC2842BN, UC2843BN, UC2845BN, UC3842BN, and UC3843BN are all ROHS3 compliant, maintaining environmental compliance with the original part.

Q: What is the switching frequency limitation of substitute parts? A: UC2842BN, UC2843BN, UC2845BN, UC3842BN, and UC3843BN operate at switching frequencies up to 500kHz, compared to the original 1MHz. Applications requiring 1MHz switching frequency must use UCC2813D-2 or verify that 500kHz operation is acceptable for the target design.