TL3845BD Equivalent & Substitute Parts

Part Overview

The TL3845BD is a Power Management IC (PMIC) from Texas Instruments designed as a boost, flyback, and forward converter regulator controller. It functions as a transistor driver for step-up and step-up/step-down DC-DC conversion topologies with positive output configuration. The device operates across a 7.6V to 30V supply voltage range with a 100kHz switching frequency and 48% maximum duty cycle. Currently in Last Time Buy status with 1221 pieces in stock, identifying qualified substitute parts is necessary for design continuity and long-term component availability.

Substiute Parts

TL3845BD

Texas InstrumentsIn Stock: 1323TL3845BD Datasheet

Current PartRFQ

TL2845DR

Texas InstrumentsIn Stock: 5233TL2845DR Datasheet

MFR RecommendedRFQ

TL3845D

Texas InstrumentsIn Stock: 2104TL3845D Datasheet

Parametric EquivalentRFQ

UC3845BDR2G

onsemiIn Stock: 3550UC3845BDR2G Datasheet

MFR RecommendedRFQ

UC3845BVDR2G

onsemiIn Stock: 3196UC3845BVDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL3845BD is determined by strict parameter matching across core electrical and mechanical specifications. All substitute parts must maintain identical package configuration (14-SOIC), supply voltage range (7.6V ~ 30V), output type (transistor driver), maximum duty cycle (48%), and control features (frequency control). The following substitute parts meet these criteria:

TL2845DR (Texas Instruments): Manufacturer-recommended substitute with identical supply voltage, duty cycle, and package. Supports extended switching frequency capability (up to 500kHz) and wider operating temperature range (-40°C ~ 85°C). Packaging differs as Cut Tape & Digi-Reel format.

TL3845D (Texas Instruments): Parametric equivalent with identical electrical specifications and operating temperature range. Maintains same switching frequency (100kHz) and duty cycle. Includes automotive-grade qualification (AEC-Q100) with identical package and supply parameters.

UC3845BDR2G (onsemi): Manufacturer-recommended substitute with matching supply voltage, duty cycle, and package. Supports extended switching frequency (up to 500kHz). Output configuration includes isolation capability. Packaged in Tape & Reel format.

UC3845BVDR2G (onsemi): Manufacturer-recommended substitute with identical electrical core parameters. Extended operating temperature range (-40°C ~ 105°C) and switching frequency capability (up to 500kHz). Output configuration includes isolation capability. Packaged in Tape & Reel format.

Parameter Comparison

Engineering Selection Recommendations

TL2845DR is suitable for applications requiring extended operating temperature range and higher switching frequency capability while maintaining Texas Instruments sourcing. Product status is Active, ensuring long-term availability.

TL3845D provides direct parametric equivalence with identical electrical performance and operating temperature specifications. Automotive-grade qualification (AEC-Q100) qualifies this part for automotive and high-reliability applications. Product status is Active.

UC3845BDR2G offers cross-manufacturer substitution with onsemi sourcing, supporting extended switching frequency operation. Isolation-capable output configuration provides additional design flexibility. Product status is Active.

UC3845BVDR2G extends operating temperature range to -40°C ~ 105°C, accommodating wider thermal environments. Isolation-capable output configuration and extended switching frequency support advanced converter topologies. Product status is Active.

All substitute parts maintain ROHS3 compliance and identical package footprint (14-SOIC), enabling direct PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can TL2845DR replace TL3845BD in existing designs? A: TL2845DR maintains identical supply voltage range, duty cycle, and package configuration. The extended switching frequency capability (up to 500kHz versus 100kHz) and wider operating temperature range (-40°C ~ 85°C) make it suitable for replacement. Verify application switching frequency requirements do not conflict with the higher maximum frequency specification.

Q: What is the difference between TL3845D and TL3845BD? A: Both parts share identical electrical specifications, supply voltage, switching frequency, and duty cycle. TL3845D includes automotive-grade qualification (AEC-Q100) and is in Active product status, whereas TL3845BD is Last Time Buy. Packaging format differs (Tube versus original specification).

Q: Are onsemi UC3845 parts pin-compatible with Texas Instruments TL3845BD? A: UC3845BDR2G and UC3845BVDR2G maintain identical 14-SOIC package configuration and pin assignment, enabling direct PCB substitution. Both support the same supply voltage range and duty cycle specifications.

Q: What does "Isolation Capable" output configuration mean for UC3845 parts? A: Isolation-capable output configuration indicates the device supports isolated converter topologies in addition to non-isolated boost and flyback configurations. This provides design flexibility without requiring circuit modifications.

Q: Which substitute part offers the widest operating temperature range? A: UC3845BVDR2G operates across -40°C ~ 105°C, the widest range among all listed parts. This specification suits applications in extreme thermal environments.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts (TL2845DR, TL3845D, UC3845BDR2G, UC3845BVDR2G) maintain ROHS3 compliance, matching the original TL3845BD specification.