TPS731125DBVR Equivalent & Substitute Parts

Part Overview

The TPS731125DBVR is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. It delivers a positive fixed 1.25V output at 150mA in a SOT-23-5 surface mount package. The device is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this voltage regulation function.

Key Parameters

Parameter	Value
Manufacturer Part Number	TPS731125DBVR
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	1.25V
Current - Output	150mA
Voltage - Input (Max)	5.5V
Voltage Dropout (Max)	0.1V @ 150mA
Package / Case	SOT-23-5 (SC-74A, SOT-753)
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution of the TPS731125DBVR is determined by the following critical parameters:

Electrical Compatibility Requirements:

Output voltage: 1.25V fixed (exact match required)
Output current capability: minimum 150mA
Input voltage range: maximum 5.5V
Dropout voltage: 0.1V @ 150mA or lower
Operating temperature range: -40°C ~ 125°C
Control features: Enable function required
Protection features: Over Current, Over Temperature minimum

Mechanical Compatibility Requirements:

Package type: SOT-23-5 (SC-74A, SOT-753) or TSOT-23-5 (thin variant)
Mounting type: Surface Mount
Compliance: ROHS3 Compliant

Substitute Categories:

Parametric Equivalent (Packaging Variant): TPS731125DBVT differs only in packaging format (Tape & Reel vs. Cut Tape), maintaining identical electrical specifications.
Manufacturer Recommended Substitutes: Parts with different output voltages or current ratings that serve similar applications but require design verification for specific voltage requirements.
Cross-Manufacturer Alternatives: Functionally equivalent regulators from alternative manufacturers meeting the same electrical and mechanical criteria.

Parameter Comparison

Parameter	TPS731125DBVR (Main)	TPS731125DBVT	TPS73601DBVR	MIC5301-2.5YD5-TR	RT9193-25GB	RT9193-25GJ5	S-1137A25-M5T1U
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Microchip Technology	Richtek USA Inc.	Richtek USA Inc.	ABLIC Inc.
Output Voltage (Fixed)	1.25V	1.25V	1.2V - 5.5V (Adjustable)	2.5V	2.5V	2.5V	2.5V
Output Current	150mA	150mA	400mA	150mA	300mA	300mA	300mA
Voltage - Input (Max)	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V
Voltage Dropout (Max)	0.1V @ 150mA	0.1V @ 150mA	0.2V @ 400mA	0.1V @ 150mA	Not Specified	Not Specified	0.35V @ 300mA
Current - Quiescent (Iq)	550 µA	550 µA	550 µA	120 µA	130 µA	130 µA	1 µA
PSRR	58dB ~ 37dB (100Hz ~ 10kHz)	58dB ~ 37dB (100Hz ~ 10kHz)	58dB ~ 37dB (100Hz ~ 10kHz)	75dB ~ 50dB (1kHz ~ 20kHz)	70dB ~ 50dB (100Hz ~ 10kHz)	70dB ~ 50dB (100Hz ~ 10kHz)	70dB (1kHz)
Package / Case	SOT-23-5	SOT-23-5	SOT-23-5	TSOT-23-5	SOT-23-5	TSOT-23-5	SOT-23-5
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Control Features	Enable	Enable	Enable	Enable	Enable	Enable	Enable, Soft Start
Protection Features	Over Current, Over Temperature, Short Circuit, Reverse Polarity	Over Current, Over Temperature, Short Circuit, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Last Time Buy	Active	Active	Active	Active	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Specifications):

TPS731125DBVT is the direct parametric equivalent, differing only in packaging format (Tape & Reel vs. Cut Tape). Both maintain identical electrical performance and are ROHS3 compliant. Selection between these two depends solely on procurement and assembly requirements.

Voltage-Specific Substitutes (Output Voltage Mismatch):

TPS73601DBVR, MIC5301-2.5YD5-TR, RT9193-25GB, RT9193-25GJ5, and S-1137A25-M5T1U all produce fixed output voltages of 2.5V or higher, or in the case of TPS73601DBVR, adjustable output. These parts are not direct substitutes for 1.25V applications without circuit redesign. They are listed as cross-references only.

Active vs. End-of-Life Status:

The main part (TPS731125DBVR) and its parametric equivalent (TPS731125DBVT) are both in Last Time Buy status. For long-term supply assurance, designs should transition to active parts. However, no active Texas Instruments part maintains identical 1.25V fixed output at 150mA in SOT-23-5 packaging.

Compliance and Certifications:

All listed parts are ROHS3 compliant and REACH unaffected. Moisture sensitivity levels vary: TPS731125DBVR, TPS731125DBVT, TPS73601DBVR, MIC5301-2.5YD5-TR, and S-1137A25-M5T1U carry MSL 1 (Unlimited), while RT9193-25GB and RT9193-25GJ5 carry MSL 3 (168 Hours), requiring controlled storage and handling.

Operating Temperature Consideration:

S-1137A25-M5T1U operates only to 85°C maximum, below the -40°C ~ 125°C range of the main part. This limits its use in high-temperature applications.

Frequently Asked Questions (FAQ)

Q: Can TPS73601DBVR replace TPS731125DBVR directly?

A: No. TPS73601DBVR is an adjustable output regulator (1.2V - 5.5V) with 400mA output capability, whereas TPS731125DBVR is a fixed 1.25V, 150mA device. Direct substitution requires external resistor network redesign to set the output voltage to 1.25V and would alter circuit performance.

Q: What is the difference between TPS731125DBVR and TPS731125DBVT?

A: Both parts are electrically identical with matching specifications. The difference is packaging format: DBVR is supplied in Cut Tape (CT) & Digi-Reel format, while DBVT is supplied in Tape & Reel (TR) format. Selection depends on assembly line requirements and procurement preferences.

Q: Why are parts with 2.5V output listed as substitutes?

A: Parts such as MIC5301-2.5YD5-TR, RT9193-25GB, RT9193-25GJ5, and S-1137A25-M5T1U are listed as cross-references from the original part's substitute list. They are not functional replacements for 1.25V applications and are included for reference only.

Q: Are the Richtek RT9193 variants (RT9193-25GB and RT9193-25GJ5) interchangeable?

A: Both RT9193 variants produce 2.5V fixed output at 300mA. The difference is package type: RT9193-25GB uses standard SOT-23-5, while RT9193-25GJ5 uses thin TSOT-23-5. They are electrically equivalent but differ in physical dimensions and moisture sensitivity (both MSL 3).

Q: What does Last Time Buy status mean for TPS731125DBVR?

A: Last Time Buy indicates the manufacturer has discontinued production and will not accept new orders after a specified date. Existing inventory may still be available, but long-term supply is not guaranteed. Designs should plan transitions to active alternatives.

Q: Can S-1137A25-M5T1U be used in applications requiring -40°C ~ 125°C operation?

A: No. S-1137A25-M5T1U operates only to 85°C maximum ambient temperature, making it unsuitable for applications requiring the full -40°C ~ 125°C range of the TPS731125DBVR.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences?

A: MSL 1 (Unlimited) parts like TPS731125DBVR require no special moisture control during storage and handling. MSL 3 (168 Hours) parts like RT9193-25GB must be stored in controlled humidity and used within 168 hours of opening the moisture barrier bag. This affects supply chain logistics and assembly procedures.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All parts in this reference are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for electronics manufacturing.

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