TPS79133DBVR Equivalent & Substitute Parts

Part Overview

The TPS79133DBVR is a linear voltage regulator IC from Texas Instruments designed to deliver a fixed 3.3V output at 100mA in a compact SOT-23-5 surface mount package. This device features integrated protection against overcurrent, overtemperature, reverse polarity, and undervoltage lockout conditions, making it suitable for low-power applications requiring stable 3.3V regulation from input sources up to 5.5V.

The TPS79133DBVR carries a Last Time Buy product status, indicating that Texas Instruments has discontinued this part. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs or design revisions.

Key Parameters

Parameter	TPS79133DBVR
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 Range	-40°C to 85°C
Protection Features	OCP, OTP, Reverse Polarity, UVLO

Substitute Part Grouping Explanation

Substitute parts for the TPS79133DBVR are selected based on the following critical parameters:

Output Voltage & Configuration: All substitutes must provide a fixed 3.3V positive output to maintain circuit compatibility.

Output Current Capability: The original part delivers 100mA. Substitutes with equal or higher current ratings (100mA, 150mA, or 300mA) are acceptable, as they provide backward compatibility without circuit modification.

Package Compatibility: The original uses SOT-23-5 packaging. Substitutes in SOT-23-5, SOT-753 (SC-74A), or TSOT-23-5 packages are pin-compatible and can be used as direct replacements on existing PCBs.

Input Voltage Range: Maximum input voltage of 5.5V or higher ensures compatibility with the original design specifications.

Protection Features: Presence of overcurrent and overtemperature protection is mandatory. Additional protections (reverse polarity, UVLO) enhance reliability but are not required for substitution.

Operating Temperature: Parts rated for -40°C to 85°C or wider ranges maintain thermal compatibility.

Product Status & Compliance: Active status parts ensure ongoing availability. RoHS3 compliance and MSL-1 rating match the original specifications.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Operating Temp	Product Status
TPS79133DBVR	Texas Instruments	100mA	5.5V	0.9V @ 100mA	250 µA	SOT-23-5	-40°C to 85°C	Last Time Buy
TPS79133DBVT	Texas Instruments	100mA	5.5V	0.9V @ 100mA	250 µA	SOT-23-5	-40°C to 85°C	Last Time Buy
TPS7A2033PDBVR	Texas Instruments	300mA	6V	0.14V @ 300mA	15 µA	SOT-23-5	-40°C to 125°C	Active
LD59015C33R	STMicroelectronics	150mA	5.5V	0.21V @ 150mA	60 µA	SOT-323-5	-40°C to 125°C	Active
LDK130M33R	STMicroelectronics	300mA	5.5V	0.4V @ 300mA	60 µA	SOT-23-5	-40°C to 125°C	Active
MIC5255-3.3YD5-TR	Microchip Technology	150mA	6V	0.25V @ 150mA	150 µA	TSOT-23-5	-40°C to 125°C	Active
MIC5255-3.3YM5-TR	Microchip Technology	150mA	6V	0.25V @ 150mA	150 µA	SOT-23-5	-40°C to 125°C	Active
MIC5301-3.3YD5-TR	Microchip Technology	150mA	5.5V	0.1V @ 150mA	120 µA	TSOT-23-5	-40°C to 125°C	Active
MIC5305-3.3YD5-TR	Microchip Technology	150mA	5.5V	0.85V @ 150mA	150 µA	TSOT-23-5	-40°C to 125°C	Active
MIC5323-3.3YD5-TR	Microchip Technology	300mA	5.5V	0.17V @ 300mA	150 µA	TSOT-23-5	-40°C to 125°C	Active
RT9193-33GB	Richtek USA Inc.	300mA	5.5V	0.3V @ 300mA	130 µA	SOT-23-5	-40°C to 125°C	Active

Engineering Selection Recommendations

Direct Parametric Equivalent: TPS79133DBVT is a parametric equivalent with identical electrical specifications and package. However, it shares the Last Time Buy status with the original part, making it unsuitable for long-term production use.

Recommended Primary Substitutes (Active Status):

TPS7A2033PDBVR from Texas Instruments offers superior performance with 300mA output current, lower dropout voltage (0.14V), significantly reduced quiescent current (15 µA), and extended operating temperature range (-40°C to 125°C). The SOT-23-5 package ensures direct PCB compatibility. This part is actively manufactured and recommended for new designs.

LDK130M33R from STMicroelectronics provides 300mA output capability with improved dropout voltage (0.4V) and lower quiescent current (60 µA). It maintains SOT-23-5 packaging and is AEC-Q100 qualified for automotive applications. Active production status ensures supply continuity.

RT9193-33GB from Richtek USA Inc. delivers 300mA output with moderate dropout voltage (0.3V) and maintains SOT-23-5 compatibility. High inventory availability (95,200 pcs) supports immediate procurement needs.

Alternative Substitutes (Different Package):

LD59015C33R from STMicroelectronics offers 150mA output in SOT-323-5 package with excellent dropout voltage (0.21V). This part requires PCB layout modification due to different pinout but provides superior performance characteristics.

Microchip Technology Options:

MIC5323-3.3YD5-TR provides 300mA output with the lowest dropout voltage (0.17V) among all substitutes, available in TSOT-23-5 package. MIC5301-3.3YD5-TR offers 150mA output with exceptional dropout voltage (0.1V) in TSOT-23-5 package. Both are actively produced with extended temperature ratings.

All recommended substitutes maintain RoHS3 compliance and MSL-1 moisture sensitivity ratings consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher output current rating than the original 100mA?

A: Yes. Substitutes rated for 150mA or 300mA are fully compatible. Higher current ratings provide design margin and do not affect circuit operation when the load current remains at or below 100mA. The regulator will operate within its specified parameters.

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

A: Dropout voltage determines the minimum input-to-output voltage differential required for proper regulation. The original TPS79133DBVR requires 0.9V dropout at 100mA. Substitutes with lower dropout voltages (such as TPS7A2033PDBVR at 0.14V or MIC5301-3.3YD5-TR at 0.1V) allow operation with lower input voltages or provide better regulation stability. Higher dropout voltage substitutes require proportionally higher input voltage headroom.

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

A: TSOT-23-5 (thin SOT-23-5) and standard SOT-23-5 packages share identical pinouts and footprints. They are mechanically and electrically interchangeable on existing PCBs. The primary difference is package height, which does not affect electrical performance or board assembly compatibility.

Q: Why do some substitutes have significantly lower quiescent current?

A: Quiescent current represents the regulator's internal power consumption when no load is connected. Lower quiescent current (such as TPS7A2033PDBVR at 15 µA versus the original 250 µA) reduces standby power consumption in battery-powered applications. This is a performance improvement that does not affect compatibility.

Q: Is the Last Time Buy status of TPS79133DBVT a concern for substitution?

A: Yes. Although TPS79133DBVT is a parametric equivalent, its Last Time Buy status indicates discontinued production. For new designs or long-term production, select from parts with Active status such as TPS7A2033PDBVR, LDK130M33R, or RT9193-33GB to ensure sustained supply availability.

Q: What does AEC-Q100 qualification mean for LDK130M33R?

A: AEC-Q100 qualification indicates the part meets automotive industry reliability and quality standards. This certification is relevant only if your application requires automotive-grade components. For non-automotive applications, this qualification provides no additional benefit but confirms manufacturing quality standards.

Q: Can I substitute a part with a different package type without PCB modification?

A: No. LD59015C33R uses SOT-323-5 package with a different pinout than the original SOT-23-5. Direct substitution requires PCB layout changes and component repositioning. Parts maintaining SOT-23-5 or TSOT-23-5 packages (such as TPS7A2033PDBVR, LDK130M33R, or RT9193-33GB) are drop-in replacements requiring no PCB modification.

Q: How do I verify that a substitute part will work in my existing design?

A: Confirm that the substitute meets these minimum criteria: fixed 3.3V output voltage, output current rating equal to or greater than your circuit requirement, maximum input voltage of 5.5V or higher, SOT-23-5 or TSOT-23-5 package (for direct PCB compatibility), and operating temperature range covering your application environment. All recommended substitutes in this document satisfy these criteria.

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