TPS79133DBVT Equivalent & Substitute Parts

Part Overview

The TPS79133DBVT is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V 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 3.3V regulation in space-constrained designs.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	100mA
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.9V @ 100mA
Quiescent Current	250 µA
Package	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 85°C
Protection Features	Over Current, Over Temperature, Reverse Polarity, UVLO
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the TPS79133DBVT is determined by the following critical parameters:

Electrical Compatibility Requirements:

Fixed output voltage of 3.3V
Input voltage rating of 5.5V or higher
Output current capability of 100mA or greater
Operating temperature range of -40°C to 85°C minimum
Enable control feature
Protection against over current and over temperature conditions

Mechanical Compatibility Requirements:

SOT-23-5 package footprint (SC-74A or equivalent TSOT-23-5)
Surface mount technology
RoHS3 compliance

Substitute parts are grouped into two categories: direct parametric equivalents (matching the original 100mA specification) and functional upgrades (higher current capability with compatible electrical characteristics). All listed substitutes maintain the 3.3V fixed output, SOT-23-5 package form factor, and required protection features.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Operating Temp	Package	Product Status
TPS79133DBVT	Texas Instruments	100mA	5.5V	0.9V @ 100mA	250 µA	-40°C to 85°C	SOT-23-5	Last Time Buy
TPS79133DBVR	Texas Instruments	100mA	5.5V	0.9V @ 100mA	250 µA	-40°C to 85°C	SOT-23-5	Last Time Buy
TPS7A2033PDBVR	Texas Instruments	300mA	6V	0.14V @ 300mA	15 µA	-40°C to 125°C	SOT-23-5	Active
LDK130M33R	STMicroelectronics	300mA	5.5V	0.4V @ 300mA	60 µA	-40°C to 125°C	SOT-23-5	Active
MIC5255-3.3YD5-TR	Microchip Technology	150mA	6V	0.25V @ 150mA	150 µA	-40°C to 125°C	TSOT-23-5	Active
MIC5255-3.3YM5-TR	Microchip Technology	150mA	6V	0.25V @ 150mA	150 µA	-40°C to 125°C	SOT-23-5	Active
MIC5301-3.3YD5-TR	Microchip Technology	150mA	5.5V	0.1V @ 150mA	120 µA	-40°C to 125°C	TSOT-23-5	Active
MIC5305-3.3YD5-TR	Microchip Technology	150mA	5.5V	0.85V @ 150mA	150 µA	-40°C to 125°C	TSOT-23-5	Active
MIC5323-3.3YD5-TR	Microchip Technology	300mA	5.5V	0.17V @ 300mA	150 µA	-40°C to 125°C	TSOT-23-5	Active
RT9193-33GB	Richtek USA Inc.	300mA	5.5V	0.3V @ 300mA	130 µA	-40°C to 125°C	SOT-23-5	Active
RT9193-33GJ5	Richtek USA Inc.	300mA	5.5V	0.3V @ 300mA	130 µA	-40°C to 125°C	TSOT-23-5	Active

Engineering Selection Recommendations

Direct Parametric Equivalent: TPS79133DBVR is the parametric equivalent to TPS79133DBVT, offering identical electrical specifications and Last Time Buy status. This part maintains 100mA output current and 0.9V dropout voltage characteristics.

Active Alternatives with Enhanced Performance: All remaining substitute parts are in Active product status, ensuring long-term availability and supply chain stability. These alternatives provide improved performance characteristics:

TPS7A2033PDBVR (Texas Instruments): Offers 300mA capability with significantly reduced quiescent current (15 µA vs. 250 µA) and improved dropout voltage (0.14V). Extended operating temperature to 125°C. Recommended for designs requiring lower power consumption.
LDK130M33R (STMicroelectronics): Provides 300mA output with AEC-Q100 automotive qualification. Lower quiescent current (60 µA) and improved dropout voltage (0.4V @ 300mA). Suitable for automotive and industrial applications.
MIC5323-3.3YD5-TR (Microchip Technology): Delivers 300mA in TSOT-23-5 package with excellent dropout voltage (0.17V @ 300mA) and PSRR performance (80dB ~ 65dB). Recommended for space-constrained designs requiring higher current capability.
RT9193-33GB (Richtek USA Inc.): Provides 300mA output in standard SOT-23-5 package with 0.3V dropout voltage and strong inventory availability (95,200 pcs). Suitable for direct footprint replacement with increased current headroom.

All substitute parts maintain RoHS3 compliance and required protection features (over current, over temperature). Selection should be based on specific application requirements for output current, dropout voltage performance, and thermal operating range.

Frequently Asked Questions (FAQ)

Q: Can I use a 300mA rated substitute in place of the 100mA TPS79133DBVT? A: Yes. Higher current-rated regulators are functionally compatible when all other electrical parameters (output voltage, input voltage rating, package, protection features) match. The 100mA load requirement of your application will operate within the 300mA capability of substitute parts. Verify that the dropout voltage and quiescent current specifications meet your design requirements.

Q: What is the difference between SOT-23-5 and TSOT-23-5 packages? A: Both are surface mount packages with identical pin configurations and footprints. TSOT-23-5 is a thinner variant. Parts marked TSOT-23-5 (such as MIC5323-3.3YD5-TR) are mechanically compatible with standard SOT-23-5 PCB layouts. Verify component height clearance in your specific application.

Q: Why do some substitutes have lower quiescent current than the original TPS79133DBVT? A: Newer regulator designs employ improved circuit topologies and manufacturing processes that reduce standby power consumption. TPS7A2033PDBVR (15 µA) and LDK130M33R (60 µA) represent modern alternatives to the original 250 µA specification. Lower quiescent current reduces overall system power consumption, particularly in battery-powered or always-on applications.

Q: Is the TPS79133DBVT still available for new designs? A: The TPS79133DBVT is classified as Last Time Buy, indicating end-of-life status. While current inventory exists (3,404 pcs), new designs should transition to Active alternatives such as TPS7A2033PDBVR, LDK130M33R, or RT9193-33GB to ensure long-term supply chain support.

Q: Do all substitute parts support the Enable control feature? A: Yes. All listed substitute parts include Enable control functionality, maintaining design compatibility with applications requiring output enable/disable capability.

Q: What is the significance of the 0.9V dropout voltage in the original part? A: Dropout voltage determines the minimum input-to-output voltage differential required for proper regulation. The TPS79133DBVT requires 0.9V headroom at 100mA. Substitute parts with lower dropout voltages (such as MIC5323-3.3YD5-TR at 0.17V @ 300mA) provide improved efficiency and allow operation with lower input voltages or higher load currents.

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