RT9167A-18GS Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RT9167A-18GS is an active linear voltage regulator IC manufactured by Richtek USA Inc., designed for positive fixed 1.8V output applications with 500mA current capacity. This Surface Mount device operates across the industrial temperature range of -40°C to 125°C and includes integrated over-current and over-temperature protection. The part is currently in active production status with ROHS3 compliance and is suitable for applications requiring stable 1.8V regulation from input sources up to 7V maximum.

Equivalent and substitute parts are identified when they meet the core functional requirements: fixed 1.8V output voltage, 500mA output current capability, compatible package form factor, and matching operating temperature range. Substitutes must maintain electrical performance within acceptable parameters for direct board-level replacement.

Substiute Parts

RT9167A-18GS

Richtek USA Inc.In Stock: 1115RT9167A-18GS Datasheet

Current PartRFQ

TPS77518D

Texas InstrumentsIn Stock: 3321TPS77518D Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RT9167A-18GS are identified based on the following critical parameters that determine functional equivalence:

• Fixed output voltage of 1.8V
• Output current rating of 500mA minimum
• 8-SOIC package form factor with 0.154" (3.90mm) width
• Operating temperature range of -40°C to 125°C
• Surface mount technology
• Enable control feature
• Over-current and over-temperature protection

The TPS77518D from Texas Instruments meets these core substitution criteria. Both devices share identical output voltage, output current capacity, package dimensions, and operating temperature specifications. Both are active products with ROHS3 compliance and suitable for direct replacement in applications where the RT9167A-18GS is specified.

Parameter Comparison

Engineering Selection Recommendations

Both the RT9167A-18GS and TPS77518D are active products with ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement. Selection between these devices should be based on application-specific requirements:

The RT9167A-18GS operates with a maximum input voltage of 7V and exhibits a maximum dropout voltage of 0.75V at 500mA output current. The TPS77518D accepts input voltages up to 10V, providing greater input voltage margin in applications with variable supply sources. The TPS77518D includes additional reset functionality and reverse polarity protection beyond the core over-current and over-temperature features present in both devices.

The TPS77518D demonstrates lower quiescent current (125 µA versus 150 µA) and superior PSRR performance (60dB versus 58dB at 100Hz). The TPS77518D also features lower moisture sensitivity (MSL 1 versus MSL 3), reducing handling and storage constraints.

Both devices are pin-compatible within the 8-SOIC package and maintain identical output voltage and current specifications, supporting direct board-level substitution without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the TPS77518D directly replace the RT9167A-18GS on an existing PCB?

A: Yes. Both devices use the 8-SOIC package with identical pin spacing (0.154", 3.90mm width) and pinout compatibility. No PCB modifications are required for substitution.

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

A: The primary differences are input voltage rating (RT9167A-18GS: 7V max; TPS77518D: 10V max), quiescent current (RT9167A-18GS: 150 µA; TPS77518D: 125 µA), and additional control features in the TPS77518D (reset function and reverse polarity protection). Output voltage, output current, and operating temperature range are identical.

Q: Are both parts suitable for industrial temperature applications?

A: Yes. Both devices operate across -40°C to 125°C, meeting industrial temperature specifications.

Q: What is the significance of the moisture sensitivity level difference?

A: The RT9167A-18GS has MSL 3 (168-hour floor life), requiring controlled storage and handling conditions. The TPS77518D has MSL 1 (unlimited floor life), eliminating moisture-related handling constraints and reducing storage complexity.

Q: Do both parts meet current compliance standards?

A: Yes. Both the RT9167A-18GS and TPS77518D are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement and use.

Q: Which part should be selected for new designs?

A: Selection depends on application requirements. The TPS77518D is suitable for applications requiring higher input voltage tolerance (up to 10V), lower quiescent current, or additional protection features. The RT9167A-18GS is appropriate for applications with input sources limited to 7V maximum and where the additional features of the TPS77518D are not required.