TPS2045DG4 Equivalent & Substitute Parts

Part Overview

The TPS2045DG4 is a Power Switch/Driver IC from Texas Instruments, configured as a 1:1 N-Channel high-side switch rated for 250mA output current in an 8-SOIC package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain functional compatibility within the specified electrical and mechanical parameters.

Substiute Parts

TPS2045DG4

Texas InstrumentsIn Stock: 1240TPS2045DG4 Datasheet

Current PartRFQ

TPS2045D

Texas InstrumentsIn Stock: 718TPS2045D Datasheet

MFR RecommendedRFQ

AP2141SG-13

Diodes IncorporatedIn Stock: 7394AP2141SG-13 Datasheet

MFR RecommendedRFQ

AP2161SG-13

Diodes IncorporatedIn Stock: 31559AP2161SG-13 Datasheet

MFR RecommendedRFQ

AP2181SG-13

Diodes IncorporatedIn Stock: 17021AP2181SG-13 Datasheet

MFR RecommendedRFQ

TPS2055D

Texas InstrumentsIn Stock: 986TPS2055D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPS2045DG4 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Output Type: N-Channel or P-Channel configuration
• Voltage - Load: 2.7V ~ 5.5V operating range
• Current - Output (Max): Minimum 250mA capability
• Rds On (Typ): On-resistance characteristics
• Input Type: Inverting or Non-Inverting logic
• Package / Case: 8-SOIC or equivalent footprint
• Fault Protection: Current Limiting, Over Temperature, UVLO
• Operating Temperature: -40°C ~ 85°C range

Substitute Categories:

1. Direct Equivalent (Same Channel Type): TPS2045D and TPS2055D maintain N-Channel configuration with identical electrical specifications and package compatibility.

2. Functional Equivalent (Alternative Channel Type): AP2141SG-13, AP2161SG-13, and AP2181SG-13 provide P-Channel alternatives with higher current ratings (500mA to 1.5A) and enhanced protection features, suitable for applications where channel polarity can be accommodated.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Direct Replacement: TPS2045D is the primary substitute for TPS2045DG4. Both parts maintain identical electrical specifications (N-Channel, 250mA, 80mOhm Rds On, Inverting input) and package configuration. TPS2045D is currently in active product status with 686 units in stock, providing immediate availability and functional continuity.

Tier 2 - Parametric Equivalent: TPS2055D provides equivalent electrical performance with the same N-Channel configuration, 250mA output current, and 80mOhm Rds On. The primary difference is Non-Inverting input logic, requiring circuit design accommodation. This part is active with 962 units in stock.

Tier 3 - Functional Alternatives (Channel Polarity Change): AP2141SG-13, AP2161SG-13, and AP2181SG-13 are P-Channel alternatives suitable for applications where circuit topology permits channel substitution. These parts offer higher current ratings (500mA to 1.5A) and enhanced protection including Reverse Current fault detection. All three are active with substantial inventory availability (7,369 to 31,500 units). Selection among these three depends on required output current capacity and input logic requirements (Non-Inverting for AP2141SG-13; Inverting for AP2161SG-13 and AP2181SG-13).

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and -40°C ~ 85°C operating temperature range, ensuring regulatory and environmental compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can TPS2055D directly replace TPS2045DG4 without circuit modification? A: TPS2055D maintains identical electrical specifications and package footprint. However, the input logic differs (Non-Inverting vs. Inverting). Circuit design must accommodate this logic inversion, requiring signal conditioning or control logic adjustment.

Q: What is the primary advantage of AP2161SG-13 or AP2181SG-13 over TPS2045D? A: The Diodes Incorporated parts provide higher output current ratings (1A and 1.5A respectively) and additional fault protection including Reverse Current detection. These features are beneficial for applications requiring higher load current or enhanced protection against reverse polarity conditions. Both maintain Inverting input logic compatible with TPS2045DG4 control signals.

Q: Are all substitute parts pin-compatible with TPS2045DG4? A: All substitute parts use the 8-SOIC package with identical footprint dimensions (0.154", 3.90mm Width). Physical PCB placement is compatible. However, internal pinout and signal logic may differ; datasheet verification is required for each substitute to confirm signal assignment compatibility.

Q: What is the difference between AP2141SG-13 and AP2161SG-13? A: Both are P-Channel switches with identical voltage and temperature specifications. AP2141SG-13 provides 500mA output current with Non-Inverting input logic. AP2161SG-13 provides 1A output current with Inverting input logic. Selection depends on required current capacity and control signal polarity compatibility with the application circuit.

Q: Can I use AP2181SG-13 as a direct upgrade for higher current applications? A: AP2181SG-13 provides 1.5A output current, the highest among all substitutes, with Inverting input logic matching TPS2045DG4. This part is suitable for applications requiring higher load current within the 2.7V ~ 5.5V load voltage range. Circuit design must accommodate P-Channel topology if the original design uses N-Channel switching.

Q: Are all substitute parts currently in active production? A: TPS2045D, TPS2055D, AP2141SG-13, AP2161SG-13, and AP2181SG-13 are all in active product status. The original TPS2045DG4 is discontinued at DiGi Electronics. All active substitutes maintain ROHS3 compliance and standard MSL 1 moisture sensitivity rating.