TL2845BP Equivalent & Substitute Parts

Part Overview

The TL2845BP is a DC-DC controller IC from Texas Instruments designed for boost, flyback, and forward regulator topologies with positive output configuration. This device operates as a transistor driver for step-up and step-up/step-down applications. The TL2845BP is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. Substitute parts maintain the same electrical functionality and core parameters while offering improved availability and active product status.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL2845BP
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Voltage - Supply (Vcc/Vdd)	7.6V ~ 30V
Frequency - Switching	Up to 500kHz
Duty Cycle (Max)	48%
Operating Temperature	-40°C ~ 85°C (TA)
Output Type	Transistor Driver
Topology	Boost, Flyback, Forward
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the TL2845BP are classified based on electrical parameter compatibility and packaging considerations. The primary substitution criteria are:

Electrical Parameters (Must Match):

Voltage - Supply (Vcc/Vdd): 7.6V ~ 30V
Frequency - Switching: Up to 500kHz
Duty Cycle (Max): 48%
Output Type: Transistor Driver
Function: Step-Up, Step-Up/Step-Down
Output Configuration: Positive
Control Features: Frequency Control

Packaging Considerations:

Through-hole packages (8-DIP, 8-Mini DIP) are direct mechanical substitutes for the original 8-DIP mounting
Surface-mount packages (8-SOIC) require PCB redesign and are classified as manufacturer-recommended alternatives for new designs

Substitute Classification:

MFR Recommended (Active Status): TL2845BDR-8, UC2845BNG, UC2845BN
Parametric Equivalent (Active Status): TL2845P

Parameter Comparison

Parameter	TL2845BP	TL2845BDR-8	UC2845BNG	UC2845BN	TL2845P
Manufacturer	Texas Instruments	Texas Instruments	onsemi	STMicroelectronics	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
Package / Case	8-DIP (0.300", 7.62mm)	8-SOIC (0.154", 3.90mm Width)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole
Voltage - Supply (Vcc/Vdd)	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V	7.6V ~ 30V
Frequency - Switching	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz	Up to 500kHz
Duty Cycle (Max)	48%	48%	48%	48%	48%
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-25°C ~ 85°C (TA)	-40°C ~ 150°C (TJ)	-40°C ~ 85°C (TA)
Output Type	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver
Topology	Boost, Flyback, Forward	Boost, Flyback, Forward	Boost, Flyback	Boost, Flyback	Boost, Flyback, Forward
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Through-Hole Replacement (No PCB Redesign): Select TL2845P, UC2845BNG, or UC2845BN. All three maintain the 8-DIP through-hole package format compatible with existing PCB layouts. TL2845P and UC2845BNG support forward topology in addition to boost and flyback, providing maximum application flexibility. UC2845BN offers extended operating temperature range (-40°C ~ 150°C TJ), suitable for high-temperature environments.

For New Designs (PCB Redesign Acceptable): TL2845BDR-8 is the manufacturer-recommended alternative, offering surface-mount 8-SOIC packaging with active product status and full inventory availability. This option is preferred for modern manufacturing processes and reduced board space requirements.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original TL2845BP regulatory requirements. All parts carry EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can TL2845BDR-8 be used as a direct replacement for TL2845BP? A: TL2845BDR-8 is electrically equivalent but requires PCB redesign due to package change from 8-DIP (through-hole) to 8-SOIC (surface-mount). For applications requiring no PCB modification, select TL2845P, UC2845BNG, or UC2845BN instead.

Q: What is the difference between UC2845BNG and UC2845BN? A: Both are functionally equivalent with identical electrical parameters. UC2845BNG is manufactured by onsemi with packaging in tube format, while UC2845BN is manufactured by STMicroelectronics. UC2845BN offers extended operating temperature range (-40°C ~ 150°C TJ) compared to UC2845BNG (-25°C ~ 85°C TA).

Q: Are forward topology applications supported by all substitutes? A: TL2845P and TL2845BDR-8 support boost, flyback, and forward topologies. UC2845BNG and UC2845BN support boost and flyback topologies only. For forward regulator applications, use TL2845P or TL2845BDR-8.

Q: What is the inventory status of substitute parts? A: TL2845BDR-8 has 1,000,400 pieces in stock. UC2845BNG has 50,100 pieces. UC2845BN has 1,925 pieces. TL2845P has 2,400 pieces. All substitutes are actively manufactured and available.

Q: Are there thermal performance differences between substitutes? A: UC2845BN supports operating temperatures up to 150°C (TJ), exceeding other substitutes. TL2845P, TL2845BDR-8, and UC2845BNG operate to 85°C (TA). Select UC2845BN for thermal-constrained applications.

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