TPS79118DBVT Linear Voltage Regulator 1.8V 100mA Equivalent & Substitute Parts

Part Overview

The TPS79118DBVT is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 100mA in a SOT-23-5 surface mount package. This device is classified as Last Time Buy, indicating end-of-life status. Finding equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring 1.8V regulation in compact form factors.

Substiute Parts

TPS79118DBVT

Texas InstrumentsIn Stock: 3846TPS79118DBVT Datasheet

Current PartRFQ

TPS7A2018PDBVR

Texas InstrumentsIn Stock: 17373TPS7A2018PDBVR Datasheet

MFR RecommendedRFQ

TPS79118DBVR

Texas InstrumentsIn Stock: 7108TPS79118DBVR Datasheet

Parametric EquivalentRFQ

LDK130M18R

STMicroelectronicsIn Stock: 24516LDK130M18R Datasheet

MFR RecommendedRFQ

RT9193-18GB

Richtek USA Inc.In Stock: 105364RT9193-18GB Datasheet

MFR RecommendedRFQ

S-1137C18-M5T1U

ABLIC Inc.In Stock: 991S-1137C18-M5T1U Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TPS79118DBVT is determined by the following critical parameters: fixed 1.8V output voltage, SOT-23-5 package compatibility, positive output configuration, and surface mount technology. Substitute parts must maintain these core electrical and mechanical specifications to ensure direct replacement capability.

Substitute parts are grouped into two categories:

Parametric Equivalents maintain identical electrical specifications (100mA output current, 5.5V maximum input, -40°C to 85°C operating range) with matching package and pinout.

Functional Alternatives provide enhanced performance characteristics (higher output current capability at 300mA, improved quiescent current, extended temperature range to 125°C) while maintaining the same 1.8V output, SOT-23-5 package, and positive fixed output configuration. These alternatives are suitable for designs where increased current capacity or improved efficiency provides system benefits.

Parameter Comparison

Engineering Selection Recommendations

TPS79118DBVR is the direct parametric equivalent, offering identical electrical performance and operating specifications. This part maintains Last Time Buy status and is available in Cut Tape & Digi-Reel® packaging, providing a straightforward replacement option with higher inventory availability (7080 pcs) compared to the original DBVT variant.

TPS7A2018PDBVR is recommended for new designs or redesigns where increased output current capacity (300mA vs. 100mA) and extended operating temperature range (-40°C to 125°C) provide system advantages. This part is in Active product status with substantial inventory (17298 pcs), ensuring long-term availability. The improved quiescent current (15 µA) reduces power consumption in battery-powered applications.

LDK130M18R from STMicroelectronics is suitable for automotive and high-reliability applications, carrying AEC-Q100 qualification. It provides 300mA output current and extended temperature range while maintaining 5.5V maximum input specification. This part is in Active status with high inventory (24433 pcs).

RT9193-18GB from Richtek USA Inc. offers 300mA output current and extended temperature range with Active product status and the highest inventory availability (105300 pcs). Note that this part carries MSL-3 moisture sensitivity level, requiring controlled storage conditions compared to MSL-1 for other alternatives.

S-1137C18-M5T1U from ABLIC Inc. is classified as Obsolete and carries the lowest inventory (928 pcs). This part should not be selected for new designs or long-term production due to end-of-life status, despite offering the lowest quiescent current (1 µA).

Frequently Asked Questions (FAQ)

Q: Can TPS79118DBVR be used as a direct replacement for TPS79118DBVT?

A: Yes. TPS79118DBVR is a parametric equivalent with identical electrical specifications, output voltage, current rating, input voltage range, and operating temperature. The primary difference is packaging format (Cut Tape & Digi-Reel® vs. Tape & Reel). Both parts use the same SOT-23-5 package and pinout, enabling direct PCB-level substitution.

Q: What is the key difference between the 100mA and 300mA output current variants?

A: The main part (TPS79118DBVT) is rated for 100mA maximum output current. Substitute parts offering 300mA (TPS7A2018PDBVR, LDK130M18R, RT9193-18GB, S-1137C18-M5T1U) provide three times the current capacity. Selection depends on the application's actual current requirements. If the design draws less than 100mA, either variant is suitable. If current demand exceeds 100mA, a 300mA-rated part is necessary.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All substitute parts use the SC-74A, SOT-753 (SOT-23-5) package with identical pinout and footprint. No PCB layout modifications are required for substitution. Verify that your PCB design accommodates the specific package dimensions, though standard SOT-23-5 footprints are universal across all listed parts.

Q: Which substitute part should be selected for new product designs?

A: TPS7A2018PDBVR is recommended for new designs. It is in Active product status, has substantial inventory, offers improved quiescent current (15 µA), supports extended operating temperature range (-40°C to 125°C), and provides increased output current capacity (300mA). This ensures long-term availability and design flexibility.

Q: What does "Last Time Buy" status mean for the TPS79118DBVT?

A: Last Time Buy indicates that Texas Instruments has announced end-of-life for this part. Existing inventory may be available for a limited period, but no new production is planned. Designs currently using this part should transition to an Active-status alternative to ensure continued supply chain support.

Q: Is the RT9193-18GB suitable for moisture-sensitive applications?

A: RT9193-18GB carries MSL-3 (Moisture Sensitivity Level 3) rating, requiring storage in controlled humidity conditions (168-hour floor life after moisture exposure). Other substitute parts carry MSL-1 (Unlimited), which do not require special moisture control. For applications with stringent moisture handling requirements, select MSL-1 rated alternatives (TPS79118DBVR, TPS7A2018PDBVR, LDK130M18R, or S-1137C18-M5T1U).

Q: Can S-1137C18-M5T1U be used in production designs?

A: S-1137C18-M5T1U is classified as Obsolete with limited inventory (928 pcs). This part should not be selected for new production designs or long-term applications. It is listed for reference only to document historical equivalence. Use Active-status alternatives for all new and ongoing production.

Q: What is the significance of the 6V maximum input voltage on TPS7A2018PDBVR?

A: TPS7A2018PDBVR supports 6V maximum input voltage compared to 5.5V for other parts. This provides additional input voltage margin in applications where supply voltage may approach the upper limit. If your design operates below 5.5V input, this difference is not significant. If input voltage approaches or exceeds 5.5V, TPS7A2018PDBVR offers improved headroom.