RT9166-12GX Equivalent & Substitute Parts

Part Overview

The RT9166-12GX is a linear voltage regulator IC manufactured by Richtek USA Inc., designed to deliver a fixed 1.2V output at 300mA in a compact SOT-89-3 surface mount package. This device is classified as a Power Management (PMIC) component and is currently in Active product status with 5450 units in stock.

The RT9166-12GX is necessary to identify alternative models due to supply chain considerations, design flexibility requirements, or application-specific performance needs. Equivalent and substitute parts must maintain compatibility across critical electrical parameters including output voltage, input voltage range, package type, and thermal operating conditions.

Substiute Parts

RT9166-12GX

Richtek USA Inc.In Stock: 5551RT9166-12GX Datasheet

Current PartRFQ

AP7217D-12YG-13

Diodes IncorporatedIn Stock: 2210AP7217D-12YG-13 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RT9166-12GX are identified based on the following critical parameters that determine functional compatibility:

Fixed Output Voltage: 1.2V output is the primary functional requirement. All substitute parts must maintain this exact output voltage specification.

Package Type: SOT-89-3 (TO-243AA) is mandatory for mechanical and thermal compatibility with existing PCB designs and thermal management requirements.

Input Voltage Range: Maximum input voltage of 5.5V establishes the upper operating boundary for the regulator circuit.

Protection Features: Over Current and Over Temperature protection are required safety functions that must be present in substitute parts.

Operating Temperature Range: -40°C ~ 85°C defines the thermal operating envelope for industrial and commercial applications.

Surface Mount Configuration: All substitute parts must be surface mount devices to maintain assembly process compatibility.

The AP7217D-12YG-13 manufactured by Diodes Incorporated qualifies as a substitute part based on these criteria. While it offers higher output current capability (600mA versus 300mA) and lower quiescent current (60 µA versus 300 µA), it maintains all critical compatibility parameters including fixed 1.2V output, SOT-89-3 package, 5.5V maximum input voltage, identical protection features, and matching operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

RT9166-12GX is the primary selection for new designs and applications requiring active product status with guaranteed long-term availability. This part is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The device offers superior voltage dropout characteristics (0.23V typical at rated current), making it suitable for applications with tight input voltage margins or requiring minimal thermal dissipation.

AP7217D-12YG-13 is suitable as a substitute where higher output current capability (600mA) is beneficial or where lower quiescent current consumption (60 µA) provides system-level power efficiency advantages. However, this part carries Last Time Buy status, indicating limited future availability. The higher voltage dropout specification (1.3V @ 600mA) must be evaluated against application input voltage headroom requirements. This substitute maintains full ROHS3 compliance and REACH unaffected status.

Both parts are identical in RoHS compliance status, MSL rating, and regulatory classification (ECCN: EAR99, HTSUS: 8542.39.0001), ensuring equivalent environmental and export compliance.

Frequently Asked Questions (FAQ)

Q: Can AP7217D-12YG-13 be used as a direct replacement for RT9166-12GX?

A: Yes, AP7217D-12YG-13 is mechanically and electrically compatible as a substitute. Both devices share identical SOT-89-3 packaging, fixed 1.2V output voltage, 5.5V maximum input voltage, and -40°C to 85°C operating temperature range. Pin-to-pin compatibility is maintained for standard linear regulator applications.

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

A: The primary differences are output current rating (300mA versus 600mA), quiescent current (300 µA versus 60 µA), and voltage dropout characteristics (0.23V versus 1.3V at rated current). AP7217D-12YG-13 offers higher current capability and lower standby current consumption, while RT9166-12GX provides superior dropout performance. Product status differs, with RT9166-12GX in Active status and AP7217D-12YG-13 in Last Time Buy status.

Q: Are there any thermal or PCB layout considerations when substituting these parts?

A: Both parts use identical TO-243AA packaging and surface mount configuration, requiring no PCB layout modifications. Thermal dissipation differences may occur due to different dropout voltages and quiescent currents under specific load conditions. Applications operating at maximum current (600mA) with AP7217D-12YG-13 may generate higher heat due to increased dropout voltage compared to the original RT9166-12GX design.

Q: Do both parts meet the same compliance and regulatory standards?

A: Yes. Both RT9166-12GX and AP7217D-12YG-13 are ROHS3 compliant, REACH unaffected, and classified under identical ECCN (EAR99) and HTSUS (8542.39.0001) codes. Both carry MSL 3 rating with 168-hour moisture sensitivity limits.

Q: Which part should be selected for new product designs?

A: RT9166-12GX is recommended for new designs due to Active product status, ensuring long-term availability and supply chain stability. AP7217D-12YG-13 should be reserved for applications where its specific performance characteristics (higher current capability, lower quiescent current) provide measurable system benefits, with awareness of its Last Time Buy status limiting future procurement options.