TPS72118MDBVREP Equivalent & Substitute Parts

Part Overview

The TPS72118MDBVREP is a linear voltage regulator IC from Texas Instruments designed for positive fixed 1.8V output at 150mA. This Surface Mount device in SOT-23-5 packaging is classified as Active product status and serves applications requiring low-dropout regulation with integrated protection features including over-current, over-temperature, and reverse polarity protection.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the allowed parameter set: output voltage (1.8V fixed), output current capability (150mA or higher), input voltage tolerance (5.5V maximum or higher), package form factor (SOT-23-5 or compatible thin variants), and protection feature alignment.

Key Parameters

Parameter	TPS72118MDBVREP	Unit
Manufacturer	Texas Instruments	—
Output Voltage (Fixed)	1.8V	V
Output Current	150	mA
Input Voltage (Max)	5.5	V
Voltage Dropout (Max)	0.24 @ 150mA	V
Quiescent Current	120	µA
Package / Case	SOT-23-5 (SC-74A)	—
Operating Temperature	-55°C to 125°C	°C
Product Status	Active	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical criteria:

Primary Substitution Criteria:

Output voltage: Fixed 1.8V
Output current: Minimum 150mA (higher ratings acceptable)
Input voltage maximum: 5.5V or greater
Package compatibility: SOT-23-5, TSOT-23-5, or 5-SSOP form factors
Control features: Enable function required
Protection features: Over-current and over-temperature protection minimum

Secondary Considerations:

Product status: Active preferred; Not For New Designs acceptable for legacy applications
Operating temperature range: Must encompass application requirements
RoHS3 compliance: Required for regulatory alignment

The following parts meet these criteria and are grouped by manufacturer and electrical performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Package	Operating Temp	Product Status
TPS72118MDBVREP	Texas Instruments	1.8V	150mA	5.5V	0.24V @ 150mA	120µA	SOT-23-5	-55°C to 125°C	Active
ADP121-AUJZ18R7	Analog Devices Inc.	1.8V	150mA	5.5V	—	21µA	TSOT-23-5	-40°C to 125°C	Active
ADP162AUJZ-1.8-R7	Analog Devices Inc.	1.8V	150mA	5.5V	—	1.25µA	TSOT-23-5	-40°C to 125°C	Active
ADP165AUJZ-1.8-R7	Analog Devices Inc.	1.8V	150mA	5.5V	—	2.4µA	TSOT-23-5	-40°C to 125°C	Active
ADP166AUJZ-1.8-R7	Analog Devices Inc.	1.8V	150mA	5.5V	—	2.4µA	TSOT-23-5	-40°C to 125°C	Active
BU18SD2MG-MTR	Rohm Semiconductor	1.8V	200mA	6V	0.29V @ 100mA	80µA	5-SSOP	-40°C to 105°C	Active
BU18UC3WG-TR	Rohm Semiconductor	1.8V	300mA	5.5V	0.32V @ 300mA	90µA	5-SSOP	-40°C to 85°C	Not For New Designs
MCP1711T-18I/OT	Microchip Technology	1.8V	150mA	6V	1.4V @ 150mA	1.27µA	SOT-23-5	-40°C to 85°C	Active
MIC5247-1.8YD5-TR	Microchip Technology	1.8V	150mA	6V	0.15V @ 150mA	150µA	TSOT-23-5	-40°C to 125°C	Active
NCP699SN18T1G	onsemi	1.8V	150mA	6V	0.62V @ 150mA	90µA	5-TSOP	-40°C to 85°C	Active

Engineering Selection Recommendations

Analog Devices ADP Series (ADP121, ADP162, ADP165, ADP166): These parts maintain full electrical equivalence with 1.8V fixed output and 150mA current rating. All are Active status with ROHS3 compliance. The ADP series offers superior quiescent current performance (1.25µA to 21µA) compared to the TPS72118MDBVREP baseline (120µA), beneficial for battery-powered applications. Package compatibility uses TSOT-23-5 thin variant. Operating temperature range extends to 125°C maximum, matching the TPS72118MDBVREP upper limit.

Rohm Semiconductor BU18 Series (BU18SD2MG-MTR, BU18UC3WG-TR): BU18SD2MG-MTR provides 200mA output current with 6V input tolerance and Active status, suitable for applications requiring higher current headroom. BU18UC3WG-TR offers 300mA output current but carries Not For New Designs status; use only in legacy system maintenance. Both employ 5-SSOP package form factor compatible with SOT-23-5 footprints. Quiescent current (80µA to 90µA) falls between TPS72118MDBVREP and Analog Devices offerings.

Microchip Technology (MCP1711T-18I/OT, MIC5247-1.8YD5-TR): MCP1711T-18I/OT maintains 150mA output with 6V input maximum and Active status. Quiescent current (1.27µA) is exceptionally low. However, dropout voltage (1.4V @ 150mA) is significantly higher than the TPS72118MDBVREP (0.24V), requiring evaluation for low-input-voltage applications. MIC5247-1.8YD5-TR offers superior dropout performance (0.15V @ 150mA) with 150mA output and Active status, suitable for applications with tight input voltage margins.

onsemi NCP699SN18T1G: Provides 150mA output with 6V input tolerance and Active status. Dropout voltage (0.62V @ 150mA) is moderate. Quiescent current (90µA) aligns with Rohm offerings. 5-TSOP package is compatible with SOT-23-5 footprints.

Compliance and Regulatory Alignment: All recommended parts maintain ROHS3 compliance and REACH unaffected status, matching the TPS72118MDBVREP regulatory profile. Select Active status parts for new designs; Not For New Designs parts (BU18UC3WG-TR) are acceptable only for sustaining legacy systems.

Frequently Asked Questions (FAQ)

Q: Can I substitute the TPS72118MDBVREP with any of these parts directly?

A: Direct substitution is possible if the application PCB footprint accommodates SOT-23-5 or compatible thin package variants (TSOT-23-5, 5-SSOP, 5-TSOP). All listed parts deliver 1.8V fixed output at 150mA minimum. Verify input voltage range, dropout voltage requirements, and operating temperature limits against your application specifications before selection.

Q: What is the key difference between the TPS72118MDBVREP and Analog Devices ADP series?

A: The primary difference is quiescent current consumption. The TPS72118MDBVREP draws 120µA at idle, while ADP162AUJZ-1.8-R7 draws only 1.25µA and ADP165AUJZ-1.8-R7 draws 2.4µA. For battery-powered or ultra-low-power applications, Analog Devices parts provide significant power savings. Electrical output performance (1.8V, 150mA) is equivalent.

Q: Why do some substitute parts show "Not For New Designs" status?

A: Parts marked "Not For New Designs" (such as BU18UC3WG-TR) are legacy components retained for sustaining existing products. Texas Instruments and other manufacturers designate these when newer alternatives with superior performance or reliability are available. Use these only for repair or maintenance of existing systems; select Active status parts for new product development.

Q: How do dropout voltage differences affect my application?

A: Dropout voltage determines the minimum input voltage required to maintain regulated output. The TPS72118MDBVREP requires 0.24V headroom at 150mA. MIC5247-1.8YD5-TR requires only 0.15V, allowing operation with lower input voltages. Conversely, MCP1711T-18I/OT requires 1.4V dropout, limiting use in applications with constrained input voltage margins. Select based on your minimum input voltage specification.

Q: Are package differences between SOT-23-5 and TSOT-23-5 significant?

A: SOT-23-5 and TSOT-23-5 (thin variant) share identical pin pitch and footprint compatibility. TSOT-23-5 offers reduced height (approximately 1.1mm vs. 1.3mm), beneficial for space-constrained designs. Electrical performance is unaffected. PCB layout and assembly processes remain compatible between variants.

Q: Which substitute part offers the best overall performance?

A: Selection depends on application priorities. For ultra-low quiescent current: ADP162AUJZ-1.8-R7 (1.25µA). For lowest dropout voltage: MIC5247-1.8YD5-TR (0.15V @ 150mA). For higher current capacity: BU18SD2MG-MTR (200mA) or BU18UC3WG-TR (300mA). For extended temperature range: ADP165AUJZ-1.8-R7 or TPS72118MDBVREP (-40°C to 125°C). Evaluate your specific constraints before selection.

Q: Do all substitute parts include the same protection features?

A: Protection features vary. The TPS72118MDBVREP includes over-current, over-temperature, and reverse polarity protection. Most Analog Devices parts (ADP121, ADP162, ADP165, ADP166) include over-current, over-temperature, and under-voltage lockout (UVLO). Rohm BU18 series include over-current and over-temperature. onsemi NCP699SN18T1G includes over-current and over-temperature. Verify protection feature alignment with your application safety requirements.

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