RT9166-18GX Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RT9166-18GX is an active linear voltage regulator IC manufactured by Richtek USA Inc., designed for positive fixed 1.8V output applications with 300mA current capacity. This Surface Mount device in SOT-89-3 package is actively produced and widely used in power management circuits requiring low-dropout regulation. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and functional equivalence to support procurement flexibility and supply chain continuity.

Substiute Parts

RT9166-18GX

Richtek USA Inc.In Stock: 863RT9166-18GX Datasheet

Current PartRFQ

AP130-18YG-13

Diodes IncorporatedIn Stock: 12953AP130-18YG-13 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RT9166-18GX are identified based on the following critical parameters that determine functional equivalence:

• Output voltage specification: 1.8V fixed output
• Maximum input voltage: 5.5V
• Output current capacity: 300mA minimum
• Package type: SOT-89-3 (TO-243AA) for direct PCB compatibility
• Output configuration: Positive fixed regulation
• Operating temperature range: -40°C ~ 85°C
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected

The AP130-18YG-13 manufactured by Diodes Incorporated meets all critical substitution criteria. Both devices share identical output voltage, input voltage rating, output current capacity, package configuration, and operating temperature range. Differences in secondary parameters (dropout voltage, quiescent current, PSRR) do not prevent functional substitution in applications designed for the RT9166-18GX.

Parameter Comparison

Engineering Selection Recommendations

Both the RT9166-18GX and AP130-18YG-13 are active products with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement. The RT9166-18GX offers lower typical dropout voltage (0.23V vs 0.5V) and higher quiescent current specification. The AP130-18YG-13 provides lower quiescent current (100 µA vs 300 µA), additional short circuit protection, and superior PSRR performance (58dB vs 55dB). Both devices are pin-compatible in SOT-89-3 package configuration and support identical voltage specifications and current ratings. Selection between these parts depends on application-specific requirements for dropout voltage performance, quiescent current minimization, or enhanced protection features.

Frequently Asked Questions (FAQ)

Q: Can AP130-18YG-13 directly replace RT9166-18GX on existing PCBs?

A: Yes. Both devices use identical SOT-89-3 package (TO-243AA) with matching pin configuration and electrical specifications for output voltage (1.8V), input voltage (5.5V max), and output current (300mA). Direct PCB substitution is supported without layout modification.

Q: What are the key differences between these substitute parts?

A: The primary differences are dropout voltage (RT9166-18GX: 0.23V typical vs AP130-18YG-13: 0.5V), quiescent current (RT9166-18GX: 300 µA vs AP130-18YG-13: 100 µA), and protection features (AP130-18YG-13 includes short circuit protection). Both maintain identical output voltage, input voltage rating, and operating temperature range.

Q: Are both parts RoHS compliant?

A: Yes. Both RT9166-18GX and AP130-18YG-13 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component use.

Q: Which part should be selected for low-power applications?

A: The AP130-18YG-13 is preferable for applications prioritizing minimal quiescent current consumption, offering 100 µA versus 300 µA for the RT9166-18GX.

Q: Which part offers better noise performance?

A: The AP130-18YG-13 provides superior PSRR performance at 58dB (100Hz) compared to the RT9166-18GX at 55dB (1kHz), resulting in better power supply rejection characteristics.

Q: Are both parts currently in production?

A: Yes. Both RT9166-18GX and AP130-18YG-13 maintain active product status with ongoing manufacturing and availability through authorized distributors.