TPS72518DCQ Equivalent & Substitute Parts

Part Overview

The TPS72518DCQ is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output applications with 1A current capacity in SOT-223-6 surface mount packaging. This device is classified as Last Time Buy, indicating limited future availability. Finding equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements.

Substiute Parts

TPS72518DCQ

Texas InstrumentsIn Stock: 705TPS72518DCQ Datasheet

Current PartRFQ

TPS74601PDRVR

Texas InstrumentsIn Stock: 44730TPS74601PDRVR Datasheet

MFR RecommendedRFQ

TPS72518DCQG4

Texas InstrumentsIn Stock: 2252TPS72518DCQG4 Datasheet

Parametric EquivalentRFQ

TPS72618DCQ

Texas InstrumentsIn Stock: 4430TPS72618DCQ Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TPS72518DCQ are classified based on the following allowed electrical and mechanical parameters:

Parametric Equivalents maintain identical or functionally equivalent specifications:

• Fixed 1.8V output voltage
• 1A output current capacity
• SOT-223-6 package compatibility
• Maximum 6V input voltage
• Identical control features (Enable, Reset)
• Identical protection features (Over Current, Over Temperature, Reverse Polarity, UVLO)
• Operating temperature range -40°C ~ 125°C

Functional Alternatives provide equivalent performance through different output configurations:

• Adjustable output voltage capability (0.55V to 5.5V range)
• 1A output current capacity
• Maximum 6V input voltage
• Surface mount packaging (different form factor)
• Reduced quiescent current consumption
• Simplified control features (Enable only)

Parameter Comparison

Engineering Selection Recommendations

TPS72518DCQG4 is a parametric equivalent with identical electrical specifications and SOT-223-6 packaging. However, this part is discontinued at DiGi Electronics, limiting its viability for new designs or long-term supply assurance.

TPS72618DCQ is a parametric equivalent offering identical output voltage, current capacity, and package compatibility. This part features reduced quiescent current (120 µA versus 225 µA), providing improved power efficiency. Product status is Last Time Buy, consistent with the main part.

TPS74601PDRVR is a functional alternative with active product status, ensuring long-term availability. This part provides adjustable output voltage capability (0.55V to 5.5V), allowing configuration to 1.8V through external resistor networks. The 6-WDFN package requires PCB layout modification. Quiescent current is significantly lower (35 µA), and dropout voltage is higher (0.896V @ 1A). Control features are simplified to Enable only, with Reverse Polarity and UVLO protection removed.

For designs requiring direct pin-compatible replacement with assured supply continuity, TPS72618DCQ is the preferred selection. For designs permitting package and control feature modifications, TPS74601PDRVR offers superior long-term availability and lower power consumption.

Frequently Asked Questions (FAQ)

Q: Can TPS72618DCQ be used as a direct replacement for TPS72518DCQ?

A: Yes. Both parts share identical output voltage (1.8V fixed), output current (1A), input voltage rating (6V max), operating temperature range (-40°C ~ 125°C), and SOT-223-6 packaging. TPS72618DCQ features lower quiescent current (120 µA versus 225 µA), which is a performance improvement. Both parts include Enable and Reset control features with identical protection (Over Current, Over Temperature, Reverse Polarity, UVLO).

Q: What are the limitations of using TPS74601PDRVR as a substitute?

A: TPS74601PDRVR requires package change from SOT-223-6 to 6-WDFN, necessitating PCB redesign. The adjustable output requires external resistor configuration to achieve 1.8V output. Dropout voltage is higher (0.896V versus 0.32V), which may impact performance in low-input-voltage applications. Reset functionality is not available. Reverse Polarity and UVLO protection are not included.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. TPS72518DCQ, TPS72518DCQG4, TPS72618DCQ, and TPS74601PDRVR are all ROHS3 compliant.

Q: What is the impact of quiescent current differences between substitute parts?

A: Quiescent current affects standby power consumption. TPS72618DCQ (120 µA) consumes 46% less quiescent current than TPS72518DCQ (225 µA). TPS74601PDRVR (35 µA) consumes 84% less quiescent current. Lower quiescent current reduces overall system power consumption, particularly in battery-powered or always-on applications.

Q: Can TPS74601PDRVR be configured for 1.8V output?

A: Yes. TPS74601PDRVR is an adjustable regulator with output range 0.55V to 5.5V. External resistor divider networks can configure the output to 1.8V. Design calculations and component selection are required based on the device datasheet feedback network specifications.

Q: What is the product status significance for long-term design planning?

A: Last Time Buy status indicates limited future availability. Active status (TPS74601PDRVR) ensures continued manufacturing and supply. For designs requiring 10+ year production support, TPS74601PDRVR is the recommended selection despite requiring design modifications.