RT9166-18PVL Equivalent & Substitute Parts

Part Overview

The RT9166-18PVL is a linear voltage regulator IC from Richtek USA Inc. designed for positive fixed 1.8V output applications. This Surface Mount device delivers 300mA output current in a compact SOT-23-3 package and is classified as Active product status. The regulator integrates over-current and over-temperature protection features, making it suitable for low-power supply applications requiring stable 1.8V regulation from input sources up to 5.5V.

Identifying equivalent and substitute parts is necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when supply chain optimization demands component standardization across production batches.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	300mA
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.23V @ 300mA (Typ)
Quiescent Current	300 µA
PSRR	55dB (1kHz)
Operating Temperature Range	-40°C ~ 85°C
Package Type	SOT-23-3
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the RT9166-18PVL is determined by strict equivalence across the following critical parameters:

Fixed output voltage of 1.8V
Output current capability of 300mA
Maximum input voltage of 5.5V
Voltage dropout specification of 0.23V @ 300mA (Typ)
Quiescent current of 300 µA
PSRR of 55dB (1kHz)
Operating temperature range of -40°C ~ 85°C
SOT-23-3 package footprint compatibility
Over-current and over-temperature protection
ROHS3 compliance and identical base product number (RT9166)

The RT9166-18GVL qualifies as a parametric equivalent substitute based on identical electrical specifications and functional characteristics. The distinction between these parts lies in packaging format and supplier device package designation, not in electrical performance or regulatory compliance.

Parameter Comparison

Parameter	RT9166-18PVL	RT9166-18GVL
Manufacturer	Richtek USA Inc.	Richtek USA Inc.
Output Voltage (Fixed)	1.8V	1.8V
Output Current	300mA	300mA
Input Voltage (Max)	5.5V	5.5V
Voltage Dropout (Max)	0.23V @ 300mA (Typ)	0.23V @ 300mA (Typ)
Quiescent Current	300 µA	300 µA
PSRR	55dB (1kHz)	55dB (1kHz)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SOT-23-3	SOT-23-3L
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active

Engineering Selection Recommendations

Both the RT9166-18PVL and RT9166-18GVL maintain Active product status from Richtek USA Inc., ensuring continued manufacturer support and availability. Both parts carry ROHS3 compliance and REACH Unaffected status, meeting current environmental and regulatory requirements for electronic component procurement.

Selection between these parts should be based on packaging and supply chain requirements. The RT9166-18PVL is supplied in standard packaging, while the RT9166-18GVL is available in Cut Tape (CT) and Digi-Reel® formats with higher inventory availability (45,900 pcs vs. 21,279 pcs). The supplier device package designation difference (SOT-23-3 vs. SOT-23-3L) reflects packaging format variation, not functional or electrical differences.

Frequently Asked Questions (FAQ)

Q: Are RT9166-18PVL and RT9166-18GVL electrically identical?

A: Yes. Both parts deliver identical electrical performance with 1.8V fixed output, 300mA current capability, 0.23V typical dropout voltage, and 55dB PSRR at 1kHz. They share the same base product number (RT9166) and protection features.

Q: What is the difference between SOT-23-3 and SOT-23-3L package designations?

A: The SOT-23-3L designation indicates a tape-and-reel packaging format (Digi-Reel®) optimized for automated assembly processes. The physical footprint and electrical performance remain identical to standard SOT-23-3 packaging.

Q: Can I substitute RT9166-18GVL for RT9166-18PVL in existing designs?

A: Yes. The parts are parametrically equivalent with identical electrical specifications, operating temperature range, and protection features. PCB layout and schematic connections require no modification.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both RT9166-18PVL and RT9166-18GVL are ROHS3 compliant and REACH Unaffected, meeting current environmental and regulatory standards for electronic component use.

Q: Which part should I select for new designs?

A: Selection depends on manufacturing requirements. RT9166-18GVL offers higher inventory availability and tape-and-reel packaging suitable for high-volume automated assembly. RT9166-18PVL is available for applications with standard packaging requirements.

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