TL2845D Equivalent & Substitute Parts

Part Overview

The TL2845D is a boost, flyback, and forward regulator controller IC manufactured by Texas Instruments, designed for positive output step-up and step-up/step-down DC-DC conversion applications. The device operates with a supply voltage range of 7.6V to 30V and supports switching frequencies up to 500kHz with a maximum duty cycle of 48%. Currently in Last Time Buy status with 4100 units in stock, alternative equivalent parts are necessary for long-term design continuity and supply chain flexibility.

Substiute Parts

TL2845D

Texas InstrumentsIn Stock: 4210TL2845D Datasheet

Current PartRFQ

TL2845DR

Texas InstrumentsIn Stock: 5233TL2845DR Datasheet

MFR RecommendedRFQ

UC2845BDG

onsemiIn Stock: 1762UC2845BDG Datasheet

MFR RecommendedRFQ

UC2845BDR2G

onsemiIn Stock: 3989UC2845BDR2G Datasheet

MFR RecommendedRFQ

TL2845BD

Texas InstrumentsIn Stock: 2031TL2845BD Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL2845D is determined by strict alignment with the following electrical and mechanical parameters:

• Package compatibility: 14-SOIC form factor (0.154", 3.90mm Width)
• Supply voltage range: 7.6V ~ 30V
• Switching frequency capability: Up to 500kHz
• Maximum duty cycle: 48%
• Output type: Transistor Driver
• Topology support: Boost, Flyback, Forward configurations
• Surface mount capability
• RoHS3 compliance

Parts are classified into two categories: MFR Recommended substitutes (manufacturer-endorsed alternatives with active or equivalent product status) and Parametric Equivalents (parts meeting all electrical and mechanical specifications but with different product lifecycle status).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TL2845DR

TL2845DR is the recommended primary substitute for TL2845D. Both parts are manufactured by Texas Instruments with identical electrical specifications, operating temperature range (-40°C ~ 85°C), and topology support (Boost, Flyback, Forward). TL2845DR maintains Active product status with higher inventory availability (5161 units), ensuring long-term supply continuity. The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect electrical performance or PCB integration.

Secondary Substitute: UC2845BDR2G

UC2845BDR2G, manufactured by onsemi, provides full electrical parameter compatibility with Active product status and substantial inventory (3966 units). This part supports Boost and Flyback topologies with identical supply voltage, switching frequency, and duty cycle specifications. The operating temperature range is -25°C ~ 85°C, which is narrower than TL2845D but suitable for most industrial applications. UC2845BDR2G includes isolation capability in its output configuration, providing additional design flexibility. Packaging is Tape & Reel format.

Tertiary Substitute: TL2845BD

TL2845BD is a parametric equivalent manufactured by Texas Instruments with identical electrical specifications and operating temperature range to TL2845D. However, it carries Last Time Buy status similar to the main part, limiting its utility for long-term supply assurance. This part is suitable only when TL2845DR is unavailable and immediate substitution is required.

Not Recommended: UC2845BDG

UC2845BDG carries Obsolete product status despite meeting all electrical parameters. While parametrically compatible, its obsolescence status makes it unsuitable for new designs or long-term production commitments.

Frequently Asked Questions (FAQ)

Q: Can TL2845DR be used as a direct replacement for TL2845D?

A: Yes. TL2845DR is electrically and functionally identical to TL2845D. Both parts share the same 14-SOIC package, supply voltage range (7.6V ~ 30V), switching frequency capability (up to 500kHz), duty cycle (48%), and operating temperature range (-40°C ~ 85°C). The only difference is packaging format (Cut Tape & Digi-Reel versus Tube), which does not affect circuit performance or PCB layout.

Q: What is the difference between TL2845D and UC2845BDR2G?

A: Both parts meet the core electrical specifications for boost, flyback, and step-up/step-down DC-DC control. Key differences are: (1) Manufacturer—Texas Instruments versus onsemi; (2) Topology support—TL2845D supports Boost, Flyback, and Forward, while UC2845BDR2G supports Boost and Flyback only; (3) Operating temperature range—TL2845D operates from -40°C to 85°C, UC2845BDR2G from -25°C to 85°C; (4) Output configuration—UC2845BDR2G includes isolation capability. For applications requiring Forward topology or extended low-temperature operation below -25°C, TL2845D or TL2845DR is required.

Q: Why is UC2845BDG not recommended despite meeting electrical specifications?

A: UC2845BDG carries Obsolete product status. While it meets all electrical and mechanical parameters, obsolete parts present supply chain risk and are not suitable for new designs or production commitments. Active or Last Time Buy status parts are preferred to ensure component availability.

Q: Are there package compatibility concerns when substituting these parts?

A: All listed substitutes use the 14-SOIC package (0.154", 3.90mm Width), ensuring PCB footprint compatibility. Differences exist only in packaging format (Tube, Cut Tape & Digi-Reel, or Tape & Reel), which affects handling and ordering but not circuit integration or electrical performance.

Q: Can TL2845BD replace TL2845D in production?

A: TL2845BD is parametrically equivalent to TL2845D with identical electrical specifications and operating temperature range. However, both parts carry Last Time Buy status, indicating limited future availability. TL2845BD should be used only when TL2845DR is unavailable. For new designs, TL2845DR is the preferred choice due to its Active status.

Q: What is the operating temperature difference between TL2845D and UC2845BDR2G?

A: TL2845D operates from -40°C to 85°C, while UC2845BDR2G operates from -25°C to 85°C. If your application requires operation below -25°C, TL2845D, TL2845DR, or TL2845BD must be used. For applications within the -25°C to 85°C range, UC2845BDR2G is suitable.