TL2845BD Equivalent & Substitute Parts

Part Overview

The TL2845BD 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. This 14-SOIC surface mount device operates across a 7.6V to 30V supply voltage range with switching frequencies up to 500kHz and a maximum duty cycle of 48%. The TL2845BD is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs or long-term support requirements.

Substiute Parts

TL2845BD

Texas InstrumentsIn Stock: 2031TL2845BD Datasheet

Current PartRFQ

TL2845DR

Texas InstrumentsIn Stock: 5233TL2845DR Datasheet

MFR RecommendedRFQ

UC2845AD

UnitrodeIn Stock: 1498UC2845AD Datasheet

MFR RecommendedRFQ

UC2845BDG

onsemiIn Stock: 1762UC2845BDG Datasheet

MFR RecommendedRFQ

UC2845BDR2G

onsemiIn Stock: 3989UC2845BDR2G Datasheet

MFR RecommendedRFQ

UC3845BVDR2G

onsemiIn Stock: 3196UC3845BVDR2G Datasheet

MFR RecommendedRFQ

TL2845D

Texas InstrumentsIn Stock: 4210TL2845D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL2845BD is determined by strict alignment with the following critical parameters:

• Package / Case: 14-SOIC (0.154", 3.90mm Width) — mechanical and electrical compatibility requirement
• Voltage - Supply (Vcc/Vdd): 7.6V ~ 30V — operational voltage range
• Frequency - Switching: Up to 500kHz — switching capability
• Duty Cycle (Max): 48% — maximum duty cycle specification
• Output Type: Transistor Driver — functional output configuration
• Function: Step-Up, Step-Up/Step-Down — topology support
• Topology: Boost, Flyback, Forward — converter type compatibility
• Output Configuration: Positive — output polarity
• Number of Outputs: 1 — single output requirement
• Control Features: Frequency Control — control methodology
• Operating Temperature: -40°C ~ 85°C (TA) — thermal operating range
• RoHS Status: ROHS3 Compliant — environmental compliance

All substitute parts listed below meet these core electrical and mechanical parameters, ensuring direct functional equivalence within the specified design constraints.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: TL2845DR

The TL2845DR is the direct manufacturer-recommended substitute for the TL2845BD. Both parts are manufactured by Texas Instruments and share identical electrical specifications, including supply voltage range (7.6V ~ 30V), switching frequency capability (up to 500kHz), duty cycle (48%), and operating temperature range (-40°C ~ 85°C). The primary difference is packaging format: TL2845DR is supplied in Cut Tape (CT) and Digi-Reel format, whereas TL2845BD is supplied in Tube format. Both maintain ROHS3 compliance and MSL 1 rating. The TL2845DR is currently in Active product status with higher inventory availability (5161 pcs), making it the preferred choice for new designs and production continuity.

Secondary Recommendation: UC2845BDR2G

The UC2845BDR2G, manufactured by onsemi, meets all critical electrical parameters and is in Active product status. It supports the same supply voltage range, switching frequency, and duty cycle specifications. The operating temperature range is -25°C ~ 85°C, which is narrower than the TL2845BD specification but remains suitable for most industrial applications. This part is available in Tape & Reel packaging with substantial inventory (3966 pcs). ROHS3 compliance and MSL 1 rating are maintained.

Tertiary Recommendation: UC3845BVDR2G

The UC3845BVDR2G, also from onsemi, provides an extended operating temperature range of -40°C ~ 105°C, exceeding the TL2845BD specification. This part is suitable for applications requiring enhanced thermal performance. All core electrical parameters align with the TL2845BD. Product status is Active with good inventory availability (3154 pcs). ROHS3 compliance and MSL 1 rating are maintained.

Alternative: TL2845D

The TL2845D is a parametric equivalent manufactured by Texas Instruments with identical electrical specifications to the TL2845BD. However, it is in Last Time Buy status, similar to the original part. This option is suitable only if existing inventory must be consumed before transitioning to active alternatives.

Not Recommended: UC2845BDG

The UC2845BDG, manufactured by onsemi, is in Obsolete product status. While it meets electrical parameter requirements, its obsolete classification makes it unsuitable for new production or long-term supply chain planning.

Not Recommended: UC2845AD

The UC2845AD, manufactured by Unitrode, lacks complete parameter specification documentation in the provided data. Incomplete technical specifications prevent full equivalence verification and are not suitable for critical design applications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace TL2845BD with TL2845DR in my existing design?

A: Yes. The TL2845DR is the manufacturer-recommended direct substitute. Both parts share identical electrical specifications, package type (14-SOIC), and operating parameters. The only difference is the packaging format (Cut Tape/Digi-Reel versus Tube). No circuit modifications are required.

Q: What is the difference between TL2845BD and UC2845BDR2G?

A: Both parts meet the core electrical requirements: 7.6V ~ 30V supply voltage, up to 500kHz switching frequency, 48% maximum duty cycle, and 14-SOIC package. The primary differences are manufacturer (Texas Instruments versus onsemi) and operating temperature range (TL2845BD: -40°C ~ 85°C; UC2845BDR2G: -25°C ~ 85°C). For applications operating below -25°C, the TL2845BD or UC3845BVDR2G are required.

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

A: The UC2845BDG is classified as Obsolete. While it meets the electrical specifications, obsolete parts present supply chain risk and are not suitable for new production designs or long-term support requirements.

Q: Does operating temperature range affect my design choice?

A: Operating temperature range affects part selection only if your application requires operation outside the specified range. The TL2845BD and TL2845DR support -40°C ~ 85°C. The UC2845BDR2G supports -25°C ~ 85°C. The UC3845BVDR2G supports -40°C ~ 105°C. Select based on your application's thermal requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts (TL2845DR, UC2845BDR2G, UC3845BVDR2G, and TL2845D) are ROHS3 compliant with MSL 1 rating, matching the TL2845BD compliance status.

Q: What packaging formats are available for substitutes?

A: TL2845DR is available in Cut Tape (CT) and Digi-Reel format. UC2845BDR2G and UC3845BVDR2G are available in Tape & Reel (TR) format. TL2845D is available in Tube format. Select based on your procurement and assembly requirements.

Q: Can I use UC3845BVDR2G in place of TL2845BD?

A: Yes. The UC3845BVDR2G meets all electrical parameter requirements and offers an extended operating temperature range (-40°C ~ 105°C). It is suitable as a direct substitute and is currently in Active product status with good inventory availability.