UC2845NG4 Equivalent & Substitute Parts

Part Overview

The UC2845NG4 is a PWM controller IC manufactured by Texas Instruments, designed for power supply applications requiring multiple topology support. This 8-PDIP through-hole component operates with a supply voltage range of 12V to 28V and is rated for -40°C to 85°C operating temperature. The part is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Substiute Parts

UC2845NG4

Texas InstrumentsIn Stock: 2344UC2845NG4 Datasheet

Current PartRFQ

UC2845N

onsemiIn Stock: 2369UC2845N Datasheet

MFR RecommendedRFQ

UC2844N

onsemiIn Stock: 16992UC2844N Datasheet

Parametric EquivalentRFQ

UC2845BN

STMicroelectronicsIn Stock: 2001UC2845BN Datasheet

MFR RecommendedRFQ

UC2845BNG

onsemiIn Stock: 50129UC2845BNG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the UC2845NG4 is determined by the following critical parameters:

• Package Compatibility: 8-DIP (0.300", 7.62mm) through-hole mounting
• Supply Voltage Range: Must accommodate the 12V ~ 28V operating window
• Operating Temperature: Must support -40°C ~ 85°C minimum
• Base Product Series: UC2845 family topology controllers
• Functional Classification: PWM controller for boost, flyback, and step-up/step-down topologies

The substitute parts listed below share the UC2845 base product number and maintain electrical and mechanical compatibility within these defined parameters.

Parameter Comparison

Engineering Selection Recommendations

UC2845BNG (onsemi) and UC2845BN (STMicroelectronics) are the primary active alternatives. Both maintain ROHS3 compliance and support the required supply voltage range. UC2845BNG offers the highest inventory availability (50,100 pcs) and is actively produced. UC2845BN provides extended junction temperature rating (-40°C ~ 150°C TJ), beneficial for high-ambient applications.

UC2845N (onsemi) is functionally compatible but carries obsolete product status and lacks RoHS3 compliance, making it unsuitable for new designs requiring regulatory compliance.

UC2844N (onsemi) is a parametric equivalent with identical operating temperature range and switching characteristics. However, its minimum supply voltage (10V) is higher than the UC2845NG4 specification (12V minimum), and product status is obsolete.

For applications requiring active production support and regulatory compliance, UC2845BNG is the recommended primary substitute. UC2845BN serves as a secondary option for thermal performance requirements.

Frequently Asked Questions (FAQ)

Q: Can UC2845N replace UC2845NG4 in new designs? UC2845N maintains electrical compatibility but is classified as obsolete and does not meet ROHS3 compliance. It is suitable only for legacy system maintenance where regulatory compliance is not required.

Q: What is the difference between UC2845BNG and UC2845BN? Both are active alternatives with identical electrical specifications and package format. UC2845BNG (onsemi) has significantly higher inventory availability. UC2845BN (STMicroelectronics) offers extended junction temperature rating to 150°C, beneficial for high-temperature environments.

Q: Is UC2844N a direct substitute? UC2844N is a parametric equivalent sharing the same package, switching frequency, and duty cycle specifications. However, its minimum supply voltage requirement (10V) differs from UC2845NG4 (12V minimum). Verify supply voltage compatibility in your application before selection.

Q: Are all substitute parts pin-compatible? All listed substitutes use the 8-DIP (0.300", 7.62mm) through-hole package. Pin compatibility is maintained across the UC2845 family variants listed.

Q: Which substitute has the best long-term availability? UC2845BNG (onsemi) is actively produced with the highest inventory level (50,100 pcs) and is the recommended choice for new production designs requiring sustained component availability.