TPS73125DBVRG4 Equivalent & Substitute Parts

Part Overview

The TPS73125DBVRG4 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 2.5V output at 150mA in a SOT-23-5 surface mount package. This device is classified as discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The regulator includes integrated protection features for over-current, over-temperature, short-circuit, and reverse-polarity conditions, with an enable control feature for power management applications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	150mA
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.1V @ 150mA
Quiescent Current	550 µA
Package Type	SOT-23-5
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit, Reverse Polarity
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the TPS73125DBVRG4 are categorized based on strict parameter alignment:

Parametric Equivalents maintain identical electrical specifications: 2.5V fixed output, 150mA output current, 5.5V maximum input voltage, 0.1V dropout voltage at 150mA, 550 µA quiescent current, SOT-23-5 package, and -40°C to 125°C operating range. These parts are direct functional replacements with no design modifications required.

Manufacturer Recommended Alternatives provide functional substitution with allowable parameter variations. These parts maintain the 2.5V output voltage, 150mA output current capability, and SOT-23-5 package form factor, but may differ in dropout voltage (up to 0.25V), quiescent current (as low as 150 µA), input voltage rating (up to 6V), or protection feature sets. These substitutes are suitable when the application can tolerate the specified parameter differences.

Higher Current Alternatives deliver 300mA output current in the same SOT-23-5 package with 2.5V fixed output. These parts are applicable when the design requires increased current capacity while maintaining package compatibility and voltage specifications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Product Status
TPS73125DBVRG4	Texas Instruments	2.5V	150mA	5.5V	0.1V @ 150mA	550 µA	SOT-23-5	Discontinued
TPS73125DBVR	Texas Instruments	2.5V	150mA	5.5V	0.1V @ 150mA	550 µA	SOT-23-5	Active
TPS73125DBVT	Texas Instruments	2.5V	150mA	5.5V	0.1V @ 150mA	550 µA	SOT-23-5	Active
MIC5255-2.5YD5-TR	Microchip Technology	2.5V	150mA	6V	0.25V @ 150mA	150 µA	TSOT-23-5	Active
MIC5255-2.5YM5-TR	Microchip Technology	2.5V	150mA	6V	0.25V @ 150mA	150 µA	SOT-23-5	Active
RT9193-25GB	Richtek USA Inc.	2.5V	300mA	5.5V	Not specified	130 µA	SOT-23-5	Active
S-1137A25-M5T1U	ABLIC Inc.	2.5V	300mA	5.5V	0.35V @ 300mA	1 µA	SOT-23-5	Obsolete

Engineering Selection Recommendations

For Direct Replacement (No Design Changes): Select TPS73125DBVR or TPS73125DBVT. Both are active Texas Instruments products with identical electrical and mechanical specifications to the discontinued TPS73125DBVRG4. These parts require no circuit modifications and provide the same performance envelope. TPS73125DBVT offers significantly higher inventory availability (999,400 units) compared to TPS73125DBVR (7,834 units).

For Active Product Substitution with Parameter Tolerance: MIC5255-2.5YM5-TR (Microchip Technology) is suitable when the application can accommodate a higher dropout voltage (0.25V versus 0.1V) and lower quiescent current (150 µA versus 550 µA). This part is ROHS3 compliant and currently active. The TSOT-23-5 variant (MIC5255-2.5YD5-TR) offers identical electrical performance in tape and reel packaging.

For Increased Current Capacity: RT9193-25GB (Richtek USA Inc.) delivers 300mA output current in the same SOT-23-5 package with 2.5V output and 5.5V input rating. This part is suitable for designs requiring higher current delivery while maintaining package compatibility. Quiescent current is reduced to 130 µA.

Avoid: S-1137A25-M5T1U is classified as obsolete and should not be selected for new designs despite its ultra-low quiescent current (1 µA) specification.

All recommended active substitutes are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can TPS73125DBVR or TPS73125DBVT be used as direct replacements for TPS73125DBVRG4?

A: Yes. Both parts are parametric equivalents with identical output voltage (2.5V), output current (150mA), input voltage rating (5.5V), dropout voltage (0.1V @ 150mA), quiescent current (550 µA), package type (SOT-23-5), and operating temperature range (-40°C to 125°C). No circuit modifications are required. The primary difference is product status: TPS73125DBVRG4 is discontinued, while TPS73125DBVR and TPS73125DBVT are active.

Q: What are the key differences between MIC5255-2.5YM5-TR and the TPS73125 series?

A: The MIC5255-2.5YM5-TR maintains the same 2.5V output voltage, 150mA output current, and SOT-23-5 package. However, it has a higher maximum input voltage (6V versus 5.5V), higher dropout voltage (0.25V versus 0.1V at 150mA), and significantly lower quiescent current (150 µA versus 550 µA). These differences are acceptable in applications where the higher dropout voltage does not compromise system performance and lower quiescent current is beneficial for battery-powered designs.

Q: When should RT9193-25GB be selected instead of the TPS73125DBVRG4?

A: RT9193-25GB is appropriate when the application requires 300mA output current instead of 150mA, while maintaining 2.5V output voltage and SOT-23-5 package compatibility. The lower quiescent current (130 µA) also provides power efficiency benefits. This part is suitable for designs with higher current demands that can fit within the same package footprint.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended active substitute parts (TPS73125DBVR, TPS73125DBVT, MIC5255-2.5YD5-TR, MIC5255-2.5YM5-TR, and RT9193-25GB) are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

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 denotes a thin variant of the SOT-23-5 package. For PCB layout and assembly purposes, these packages are mechanically compatible. Verify with your assembly partner if thin package variants require any process adjustments.

Q: Why is S-1137A25-M5T1U listed if it is obsolete?

A: S-1137A25-M5T1U is included for reference as a known substitute that may exist in legacy designs or inventory. However, it is classified as obsolete and should not be selected for new designs. Active alternatives with superior product status are available.

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