TLV75518PDQNT Equivalent & Substitute Parts

Part Overview

The TLV75518PDQNT is an active linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This device delivers a fixed positive 1.8V output at 500mA with a maximum dropout voltage of 0.4V, designed for surface mount applications in the 4-X2SON (1x1) package. The part maintains active product status with 894 units currently in stock. Alternative equivalent parts are necessary to address supply chain flexibility, inventory availability, and application-specific performance requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TLV75518PDQNT
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.8V
Output Current	500mA
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.4V @ 500mA
Quiescent Current	31 µA
Package Type	4-XDFN Exposed Pad (4-X2SON 1x1)
Operating Temperature	-40°C ~ 125°C (TJ)
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the TLV75518PDQNT are identified based on the following critical parameters that determine functional equivalence:

Parametric Equivalence Criteria:

Output voltage configuration (Positive, Fixed)
Output current rating (500mA)
Maximum input voltage (5.5V)
Package type compatibility (surface mount, similar footprint)
Control features (Enable function)
Protection features (Over Current, Over Temperature minimum)
Product status (Active)
Compliance certifications (ROHS3, REACH Unaffected)

Substitute Categories:

Parametric Equivalent – TLV75518PDQNR: Identical electrical specifications and package configuration. Differs only in packaging format (Cut Tape & Digi-Reel vs. standard reel configuration).
Manufacturer Recommended Equivalent – RT9081A-09GQZA(2): Cross-manufacturer substitute with compatible output current (500mA) and input voltage rating (5.5V). Differs in output voltage (0.9V vs. 1.8V), package size (6-ZADFN vs. 4-X2SON), and thermal operating range.

Parameter Comparison

Parameter	TLV75518PDQNT	TLV75518PDQNR	RT9081A-09GQZA(2)
Manufacturer	Texas Instruments	Texas Instruments	Richtek USA Inc.
Output Voltage (Fixed)	1.8V	1.8V	0.9V
Output Current	500mA	500mA	500mA
Input Voltage (Max)	5.5V	5.5V	5.5V
Dropout Voltage (Max)	0.4V @ 500mA	0.4V @ 500mA	0.25V @ 500mA
Quiescent Current	31 µA	31 µA	110 µA
PSRR	52dB (1kHz ~ 1MHz)	52dB (1kHz ~ 1MHz)	80dB (1kHz)
Package Type	4-XDFN Exposed Pad (4-X2SON 1x1)	4-XDFN Exposed Pad (4-X2SON 1x1)	6-XFDFN Exposed Pad (6-ZADFN 1.2x1.2)
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

TLV75518PDQNR is the direct parametric equivalent for applications requiring identical electrical performance and package footprint. Both parts maintain identical output voltage (1.8V), current rating (500mA), dropout voltage (0.4V @ 500mA), and quiescent current (31 µA). Selection between TLV75518PDQNT and TLV75518PDQNR depends solely on packaging format availability and supply chain requirements. Both parts carry Active product status, ROHS3 compliance, and MSL 1 rating, ensuring equivalent reliability and environmental qualification.

RT9081A-09GQZA(2) is a manufacturer-recommended cross-substitute applicable only to applications where the output voltage requirement is 0.9V rather than 1.8V. This part introduces design-level changes: the 6-ZADFN package (1.2x1.2mm) differs from the 4-X2SON footprint, requiring PCB layout modification. The operating temperature range is reduced to -40°C ~ 85°C (TA), and moisture sensitivity increases to MSL 3. Quiescent current rises to 110 µA. Selection of this part requires verification that the application's output voltage specification permits 0.9V operation and that thermal and packaging constraints are acceptable.

Frequently Asked Questions (FAQ)

Q: Can TLV75518PDQNR be used as a direct replacement for TLV75518PDQNT?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, output voltage (1.8V), current rating (500mA), dropout voltage, and package configuration (4-X2SON). The difference is packaging format (Cut Tape & Digi-Reel vs. standard reel). No circuit or PCB modifications are required.

Q: Is RT9081A-09GQZA(2) compatible with designs specified for TLV75518PDQNT?

A: Compatibility depends on application requirements. The RT9081A outputs 0.9V instead of 1.8V, requiring circuit redesign if the 1.8V output is mandatory. The package footprint differs (6-ZADFN vs. 4-X2SON), necessitating PCB layout changes. Operating temperature range is narrower (-40°C ~ 85°C vs. -40°C ~ 125°C). Use this part only when output voltage, package, and thermal specifications permit modification.

Q: What are the key differences between TLV75518PDQNT and RT9081A-09GQZA(2)?

A: Output voltage differs (1.8V vs. 0.9V). Package size differs (4-X2SON 1x1 vs. 6-ZADFN 1.2x1.2). Operating temperature range differs (-40°C ~ 125°C vs. -40°C ~ 85°C). Quiescent current is higher in RT9081A (110 µA vs. 31 µA). Dropout voltage is lower in RT9081A (0.25V vs. 0.4V). Moisture sensitivity differs (MSL 1 vs. MSL 3).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. TLV75518PDQNT, TLV75518PDQNR, and RT9081A-09GQZA(2) are all ROHS3 compliant and REACH unaffected, meeting equivalent environmental and regulatory standards.

Q: Which substitute part has the best availability?

A: TLV75518PDQNR has the highest inventory (17,100 units) compared to TLV75518PDQNT (894 units) and RT9081A-09GQZA(2) (2,509 units). For supply chain continuity, TLV75518PDQNR is the preferred parametric equivalent.

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