TL3845BDR Equivalent & Substitute Parts

Part Overview

The TL3845BDR is a boost, flyback, and forward converter regulator controller IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This device functions as a positive output step-up/step-down DC-DC controller with transistor driver output capability. The part is currently in Last Time Buy status, making identification of equivalent and substitute components essential for design continuity and procurement planning. Alternative parts are necessary to ensure supply chain flexibility and long-term product availability.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TL3845BDR
Category	Power Management (PMIC)
Package / Case	14-SOIC (0.154", 3.90mm Width)
Topology	Boost, Flyback, Forward Converter
Function	Step-Up, Step-Up/Step-Down
Output Configuration	Positive
Voltage - Supply (Vcc/Vdd)	7.6V ~ 30V
Frequency - Switching	100kHz
Duty Cycle (Max)	48%
Operating Temperature	0°C ~ 70°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TL3845BDR is determined by the following critical parameters: package type (14-SOIC), supply voltage range (7.6V ~ 30V), maximum duty cycle (48%), output configuration (positive), and topology support (boost, flyback, forward converter). Parts are grouped into three categories based on their relationship to the main part:

MFR Recommended Substitutes maintain full parametric compatibility with identical or superior specifications while offering active product status and extended availability.

Parametric Equivalents share identical electrical characteristics and operating conditions with the main part, differing only in product status or qualification level.

Direct Manufacturer Alternatives provide functional equivalence from alternative manufacturers with compatible package and electrical specifications, though operating temperature ranges may differ.

Parameter Comparison

Parameter	TL3845BDR	TL2845DR	TL3845DR	UC3845BVDR2G	UC3845BDR2G
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	onsemi	onsemi
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Voltage - Supply (Vcc/Vdd)	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V
Frequency - Switching	100kHz	Up to 500kHz	100kHz	Up to 500kHz	Up to 500kHz
Duty Cycle (Max)	48%	48%	48%	48%	48%
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 105°C	0°C ~ 70°C
Output Configuration	Positive	Positive	Positive	Positive, Isolation Capable	Positive, Isolation Capable
Topology	Boost, Flyback, Forward Converter	Boost, Flyback, Forward	Boost, Flyback, Forward Converter	Boost, Flyback	Boost, Flyback
Product Status	Last Time Buy	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement with identical specifications: TL3845DR is the parametric equivalent from Texas Instruments with active product status. This part maintains the same operating temperature range (0°C ~ 70°C), switching frequency (100kHz), and all electrical characteristics as the TL3845BDR.

For extended temperature operation: TL2845DR supports operation from -40°C to 85°C and offers higher switching frequency capability (up to 500kHz) while maintaining all other critical parameters. This part is recommended for applications requiring broader temperature range coverage.

For alternative manufacturer sourcing: UC3845BDR2G from onsemi provides functional equivalence with identical supply voltage range and duty cycle specifications. This part maintains the 0°C ~ 70°C operating temperature range matching the main part. UC3845BVDR2G extends the operating temperature to -40°C ~ 105°C for applications requiring enhanced thermal performance.

All substitute parts listed are ROHS3 compliant with MSL 1 rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can TL2845DR be used as a direct replacement for TL3845BDR?

A: TL2845DR is functionally compatible and maintains the same supply voltage range (7.6V ~ 30V) and duty cycle (48%). The primary differences are extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C) and higher maximum switching frequency (up to 500kHz versus 100kHz). Substitution is valid for applications within the TL3845BDR's original temperature specification.

Q: What is the difference between TL3845DR and TL3845BDR?

A: Both parts share identical electrical specifications, package type (14-SOIC), and operating temperature range (0°C ~ 70°C). The primary distinction is product status: TL3845BDR is Last Time Buy while TL3845DR is Active. TL3845DR is the recommended long-term alternative.

Q: Are onsemi UC3845 parts compatible with Texas Instruments TL3845BDR?

A: UC3845BDR2G and UC3845BVDR2G are functionally compatible alternatives with identical supply voltage range, duty cycle, and package specifications. Both support boost and flyback topologies. The UC3845 series offers isolation-capable output configuration. Operating temperature ranges differ: UC3845BDR2G matches the TL3845BDR range (0°C ~ 70°C), while UC3845BVDR2G extends to -40°C ~ 105°C.

Q: Does package type affect substitution eligibility?

A: All listed substitute parts use the 14-SOIC package with identical dimensions (0.154", 3.90mm width). Package compatibility is confirmed across all alternatives. Packaging format (Cut Tape, Tape & Reel) does not affect electrical or mechanical compatibility.

Q: What compliance certifications apply to these parts?

A: All parts listed are ROHS3 compliant with Moisture Sensitivity Level 1 (unlimited shelf life). REACH status is unaffected for all alternatives. These certifications ensure compatibility with standard manufacturing processes and regulatory requirements.

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