TPS79133DBVREP Equivalent & Substitute Parts

Part Overview

The TPS79133DBVREP is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output at 100mA in SOT-23-5 surface mount packaging. This device is currently in active production status with 721 units in stock. Finding equivalent and substitute parts becomes necessary when the primary part reaches end-of-life, when alternative sourcing is required for supply chain resilience, or when design requirements call for enhanced performance characteristics such as higher output current capacity or improved dropout voltage specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	TPS79133DBVREP
Manufacturer	Texas Instruments
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
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the TPS79133DBVREP are classified based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

Critical Parameters for Substitution:

Output voltage fixed at 3.3V
Surface mount packaging in SOT-23-5 form factor
Positive output configuration with single regulator
Operating temperature range -40°C to 125°C
Enable control feature
RoHS3 compliance

Secondary Parameters Affecting Substitution Scope:

Output current capacity (100mA minimum for direct substitution; higher ratings allow design flexibility)
Dropout voltage performance
Quiescent current consumption
Input voltage maximum rating (5.5V or 6V acceptable)
Protection features (Over Current, Over Temperature minimum required)

Substitute parts are grouped into two categories: parametric equivalents from the same manufacturer (Texas Instruments) and manufacturer-recommended alternatives from Microchip Technology and Richtek USA Inc. that meet or exceed the electrical specifications of the primary part.

Parameter Comparison

Part Number	Manufacturer	Output Current	Dropout Voltage (Max)	Quiescent Current	Input Voltage (Max)	Package	Product Status
TPS79133DBVREP	Texas Instruments	100mA	0.9V @ 100mA	250 µA	5.5V	SOT-23-5	Active
TPS79133DBVRG4Q1	Texas Instruments	100mA	0.9V @ 100mA	250 µA	5.5V	SOT-23-5	Last Time Buy
MIC5255-3.3YD5-TR	Microchip Technology	150mA	0.25V @ 150mA	150 µA	6V	TSOT-23-5	Active
MIC5301-3.3YD5-TR	Microchip Technology	150mA	0.1V @ 150mA	120 µA	5.5V	TSOT-23-5	Active
MIC5305-3.3YD5-TR	Microchip Technology	150mA	0.85V @ 150mA	150 µA	5.5V	TSOT-23-5	Active
RT9193-33GB	Richtek USA Inc.	300mA	0.3V @ 300mA	130 µA	5.5V	SOT-23-5	Active
TC2015-3.3VCTTR	Microchip Technology	100mA	0.14V @ 100mA	80 µA	6V	SOT-23-5	Active

Engineering Selection Recommendations

TPS79133DBVRG4Q1 (Texas Instruments): This part is a parametric equivalent with identical electrical specifications to the primary part. However, it carries Last Time Buy status, indicating limited future availability. Selection of this substitute should be reserved for applications requiring automotive-grade qualification (AEC-Q100) or when Texas Instruments sourcing is mandated by design requirements.

MIC5301-3.3YD5-TR (Microchip Technology): This part offers superior performance with 50% higher output current (150mA vs. 100mA), significantly lower dropout voltage (0.1V vs. 0.9V), and reduced quiescent current (120 µA vs. 250 µA). Active product status with 6601 units in stock provides supply security. The TSOT-23-5 package is mechanically compatible with SOT-23-5 footprints. This substitute is recommended for designs where improved power efficiency and thermal performance are beneficial.

MIC5305-3.3YD5-TR (Microchip Technology): This part provides 50% higher output current capacity (150mA) with active product status and high inventory (10507 units). Dropout voltage performance is comparable to the primary part (0.85V vs. 0.9V). Selection is appropriate when increased current headroom is required without redesign constraints.

MIC5255-3.3YD5-TR (Microchip Technology): This part delivers 50% higher output current (150mA) with superior dropout voltage (0.25V) and reduced quiescent current (150 µA). Input voltage rating extends to 6V. Active status with 10633 units in stock ensures availability. Suitable for applications prioritizing efficiency and thermal management.

RT9193-33GB (Richtek USA Inc.): This part offers the highest output current capacity (300mA) with excellent dropout voltage performance (0.3V @ 300mA) and low quiescent current (130 µA). Maintains SOT-23-5 package compatibility. Active product status with 95200 units in stock provides exceptional supply availability. Selection is appropriate for designs requiring significant current margin or future scalability.

TC2015-3.3VCTTR (Microchip Technology): This part matches the primary part's 100mA output current specification with superior dropout voltage (0.14V vs. 0.9V) and significantly lower quiescent current (80 µA vs. 250 µA). Input voltage rating extends to 6V. Active status with 4325 units in stock. Recommended for applications where power consumption minimization is critical.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher output current rating than the TPS79133DBVREP?

A: Yes. Parts with higher current ratings (150mA or 300mA) are backward compatible with designs requiring 100mA or less. The regulator will supply only the current demanded by the load. Higher current ratings provide design margin and do not negatively impact circuit operation at lower current levels.

Q: Are TSOT-23-5 and SOT-23-5 packages interchangeable on the PCB?

A: TSOT-23-5 (thin SOT-23-5) and standard SOT-23-5 packages share identical pin configurations and footprints. TSOT-23-5 is a thinner variant suitable for the same PCB layouts. No redesign is required when substituting between these package types.

Q: What is the significance of dropout voltage differences between substitute parts?

A: Dropout voltage determines the minimum input-to-output voltage differential required for proper regulation. Lower dropout voltage (0.1V to 0.3V) allows operation with lower input voltages or provides better efficiency at fixed input voltages. The TPS79133DBVREP has 0.9V dropout, while substitutes range from 0.1V to 0.85V. Lower dropout voltage is advantageous but not required for compatibility.

Q: Does quiescent current affect circuit performance?

A: Quiescent current is the regulator's internal consumption when supplying no load current. Lower quiescent current reduces overall power consumption in battery-powered or low-power applications. The TPS79133DBVREP draws 250 µA; substitutes range from 80 µA to 150 µA. This parameter is significant only in power-sensitive designs.

Q: Why is TPS79133DBVRG4Q1 marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has announced end-of-production for this part. Existing inventory may be available, but no new manufacturing is planned. This part should be selected only when automotive qualification or specific Texas Instruments requirements are mandatory. For new designs, active-status alternatives are recommended.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance certification, matching the primary part's environmental compliance status.

Q: Can I substitute the TPS79133DBVREP in an existing design without PCB modifications?

A: Yes, for all listed substitutes. All parts maintain SOT-23-5 or TSOT-23-5 packaging with identical pin configurations. No PCB layout changes are required. Electrical parameter differences (dropout voltage, quiescent current, output current) do not require circuit modifications for proper operation.

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