RT9170-18GV Equivalent & Substitute Parts

Part Overview

The RT9170-18GV is a linear voltage regulator IC manufactured by Richtek USA Inc., designed to deliver a fixed 1.8V output at 300mA in a compact SOT-23-3 surface mount package. This device is classified as a Power Management (PMIC) component and maintains Active product status. Linear regulators of this specification are essential in applications requiring stable low-voltage power delivery with minimal component count. Substitute parts are identified to provide design flexibility, inventory alternatives, and sourcing options while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	RT9170-18GV
Manufacturer	Richtek USA Inc.
Category	Power Management (PMIC)
Package / Case	TO-236-3, SC-59, SOT-23-3
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.8V
Current - Output	300mA
Voltage - Input (Max)	5.5V
Voltage Dropout (Max)	0.24V @ 300mA
Operating Temperature	-40°C ~ 125°C
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RT9170-18GV are identified based on strict electrical and mechanical parameter alignment. The substitution criteria are:

Fixed output voltage of 1.8V
Output current capability of 300mA
Maximum input voltage of 5.5V
Surface mount package compatibility (SOT-23-3 / SC-59 / TO-236-3)
Positive output configuration
Active product status
RoHS3 compliance

The AP130-18RG-7 from Diodes Incorporated meets these core substitution parameters. Both devices share identical output voltage, current rating, input voltage maximum, and package form factor. Differences in secondary parameters such as quiescent current, PSRR, dropout voltage, and operating temperature range do not disqualify substitution but require design verification for specific application requirements.

Parameter Comparison

Parameter	RT9170-18GV (Main)	AP130-18RG-7 (Substitute)
Manufacturer	Richtek USA Inc.	Diodes Incorporated
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Voltage - Output (Min/Fixed)	1.8V	1.8V
Current - Output	300mA	300mA
Voltage - Input (Max)	5.5V	5.5V
Voltage Dropout (Max)	0.24V @ 300mA	0.4V @ 300mA
Current - Quiescent (Iq)	15 µA	100 µA
PSRR	40dB (1kHz)	58dB (100Hz)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C (TA)
Product Status	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Control Features	Enable	-
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit

Engineering Selection Recommendations

Both the RT9170-18GV and AP130-18RG-7 are Active product status devices with ROHS3 compliance, suitable for new designs and production environments. Selection between these parts depends on application-specific requirements:

The RT9170-18GV offers lower quiescent current (15 µA vs. 100 µA) and lower dropout voltage (0.24V vs. 0.4V), making it preferable for battery-powered or low-power applications where efficiency is critical. The RT9170-18GV also supports higher operating temperatures up to 125°C.

The AP130-18RG-7 provides higher PSRR (58dB at 100Hz vs. 40dB at 1kHz) and includes short circuit protection in addition to over current and over temperature protection. The AP130-18RG-7 is available in higher inventory quantities (9300 Pcs vs. 682 Pcs).

Both devices are mechanically and electrically compatible for the specified 1.8V, 300mA output configuration in SOT-23-3 packaging.

Frequently Asked Questions (FAQ)

Q: Can the AP130-18RG-7 directly replace the RT9170-18GV in existing designs?

A: Yes, both devices share identical output voltage (1.8V), output current (300mA), input voltage maximum (5.5V), and package form factor (SOT-23-3). Pin-to-pin compatibility is maintained. However, differences in dropout voltage, quiescent current, and operating temperature range may affect performance in specific applications and should be evaluated against design requirements.

Q: What is the impact of the higher dropout voltage in the AP130-18RG-7?

A: The AP130-18RG-7 has a maximum dropout voltage of 0.4V at 300mA compared to 0.24V for the RT9170-18GV. This means the AP130-18RG-7 requires a higher input voltage to maintain regulation at full load. For applications with tight input voltage margins, the RT9170-18GV is the preferred choice.

Q: Why does the AP130-18RG-7 have higher quiescent current?

A: The AP130-18RG-7 specifies 100 µA quiescent current versus 15 µA for the RT9170-18GV. In battery-powered or ultra-low-power applications where standby current is critical, the RT9170-18GV is more suitable. For standard applications, this difference is typically negligible.

Q: Are there temperature range limitations with the AP130-18RG-7?

A: The AP130-18RG-7 operates from -40°C to 85°C, while the RT9170-18GV extends to 125°C. For applications requiring operation above 85°C ambient temperature, the RT9170-18GV must be used.

Q: What additional protection does the AP130-18RG-7 provide?

A: The AP130-18RG-7 includes short circuit protection in addition to over current and over temperature protection. The RT9170-18GV provides over current and over temperature protection. Both devices meet the protection requirements for standard linear regulator applications.

Q: Are both parts RoHS compliant?

A: Yes, both the RT9170-18GV and AP130-18RG-7 are ROHS3 compliant and suitable for applications requiring RoHS certification.

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