UCC2891DG4 Equivalent & Substitute Parts

Part Overview

The UCC2891DG4 is a flyback and forward converter regulator controller IC manufactured by Texas Instruments, designed for positive, isolation-capable output step-up/step-down DC-DC applications. This 16-SOIC surface mount device provides transistor driver output with integrated current limit, enable, on-time control, ramp, and soft start control features.

The UCC2891DG4 has been discontinued at DiGi Electronics. Equivalent and substitute parts remain available in active product status, making them suitable alternatives for new designs and production requirements where the original part is no longer procurable.

Substiute Parts

UCC2891DG4

Texas InstrumentsIn Stock: 984UCC2891DG4 Datasheet

Current PartRFQ

UCC2891D

Texas InstrumentsIn Stock: 895UCC2891D Datasheet

MFR RecommendedRFQ

UCC2893D

Texas InstrumentsIn Stock: 10446UCC2893D Datasheet

Parametric EquivalentRFQ

UCC2892D

UnitrodeIn Stock: 1049UCC2892D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UCC2891DG4 is determined by strict equivalence across the following critical parameters:

• Voltage Supply Range: 8.5V ~ 16V
• Switching Frequency: 250kHz
• Maximum Duty Cycle: 70%
• Output Type: Transistor Driver
• Function: Step-Up/Step-Down
• Output Configuration: Positive, Isolation Capable
• Topology: Flyback, Forward Converter
• Number of Outputs: 1
• Output Phases: 1
• Operating Temperature Range: -40°C ~ 85°C
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Control Features: Current Limit, Enable, On Time Control, Ramp, Soft Start

All substitute parts listed maintain identical electrical specifications and mechanical compatibility with the original UCC2891DG4, ensuring direct functional replacement in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

UCC2891D is the manufacturer-recommended direct substitute. This part maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. Selection of UCC2891D is appropriate for applications requiring direct compatibility with existing UCC2891DG4 designs.

UCC2893D is a parametric equivalent offering identical functional specifications and active product status. This part provides higher inventory availability (10,400 pcs) compared to UCC2891D (803 pcs) and maintains full ROHS3 compliance and MSL Level 1 rating.

UCC2892D is a parametric equivalent manufactured by Unitrode with identical electrical and mechanical specifications. This part maintains active product status and supports the same topology, frequency, and control feature set. RoHS and MSL compliance information is not specified for this variant.

All three substitute parts are suitable for applications where the UCC2891DG4 has been discontinued, provided that design validation confirms compatibility with the specific manufacturer and packaging variant selected.

Frequently Asked Questions (FAQ)

Q: Can UCC2891D be used as a direct replacement for UCC2891DG4?

A: Yes. UCC2891D is the manufacturer-recommended substitute with identical electrical specifications, operating temperature range, switching frequency, duty cycle, and 16-SOIC package configuration. The primary difference is product status (active vs. discontinued) and packaging format (tube vs. original).

Q: What is the difference between UCC2891D, UCC2893D, and UCC2892D?

A: All three parts are parametric equivalents with identical electrical and mechanical specifications for the UCC2891DG4. Differences include manufacturer (Texas Instruments vs. Unitrode for UCC2892D), inventory availability, and compliance documentation. UCC2893D offers the highest inventory level at 10,400 pcs.

Q: Are these parts pin-compatible?

A: Yes. All substitute parts use the 16-SOIC (0.154", 3.90mm Width) package with identical pinout, enabling direct PCB replacement without layout modifications.

Q: Do all substitute parts meet RoHS compliance?

A: UCC2891D and UCC2893D are ROHS3 compliant. UCC2892D compliance status is not specified in available documentation.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: UCC2891D and UCC2893D both carry MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions. UCC2892D MSL rating is not specified.

Q: Can I use these parts interchangeably in production?

A: Yes, provided that the selected substitute meets your specific compliance, inventory, and manufacturer requirements. All parts maintain identical electrical functionality and package compatibility with the UCC2891DG4.