RT8024GB Equivalent & Substitute Parts

Part Overview

The RT8024GB is a buck switching regulator IC manufactured by Richtek USA Inc., designed for positive adjustable output applications. This Power Management (PMIC) component delivers 400mA output current with adjustable voltage from 0.6V to 5.5V, operating across an input range of 2.5V to 5.5V. The device features synchronous rectification and operates at 1.5MHz switching frequency in a compact SC-74A (SOT-753) surface mount package.

The RT8024GB maintains Active product status with full RoHS3 compliance and REACH unaffected designation. Equivalent and substitute parts are identified based on matching electrical performance parameters, package compatibility, and regulatory compliance to support design flexibility and supply chain continuity.

Key Parameters

Parameter	RT8024GB Specification
Manufacturer	Richtek USA Inc.
Function	Step-Down (Buck)
Output Configuration	Positive Adjustable
Output Voltage Range	0.6V to 5.5V
Input Voltage Range	2.5V to 5.5V
Output Current	400mA
Switching Frequency	1.5MHz
Synchronous Rectifier	Yes
Operating Temperature	-40°C to 85°C
Package Type	SC-74A, SOT-753 (SOT-23-5)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the RT8024GB are qualified based on the following critical parameters:

Topology & Function: All substitutes must be buck (step-down) switching regulators with positive adjustable output configuration
Voltage Specifications: Input range minimum 2.5V, input range maximum 5.5V; output adjustable from 0.6V to 5.5V
Package Compatibility: SOT-23-5 or TSOT-23-5 (thin variant) surface mount packages
Synchronous Rectification: All substitutes include integrated synchronous rectifier
Operating Temperature: -40°C to 85°C ambient temperature range
Regulatory Compliance: RoHS3 compliant, REACH unaffected status
Output Current Capability: Minimum 400mA (substitutes may exceed this specification)

Substitutes are grouped into two categories: direct current-rated equivalents (600mA and 2A variants) and higher-current alternatives that maintain full electrical and mechanical compatibility.

Parameter Comparison

Parameter	RT8024GB	LTC3406ABES5-2#TRMPBF	LTC3406AES5#TRMPBF	LTC3406AES5#TRPBF	LTC3406B-2ES5#TRMPBF	LTC3406BES5#TRMPBF	AP3429AKTTR-G1	AP3429KTTR-G1
Manufacturer	Richtek USA Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Diodes Incorporated	Diodes Incorporated
Function	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down
Output Configuration	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable
Input Voltage (Min)	2.5V	2.5V	2.5V	2.5V	2.5V	2.5V	2.7V	2.7V
Input Voltage (Max)	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V
Output Voltage (Min/Fixed)	0.6V	0.6V	0.6V	0.6V	0.6V	0.6V	0.6V	0.6V
Output Voltage (Max)	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V	5.5V
Output Current	400mA	600mA	600mA	600mA	600mA	600mA	2A	2A
Switching Frequency	1.5MHz	1.5MHz	1.5MHz	1.5MHz	2.25MHz	1.5MHz	1MHz	1MHz
Synchronous Rectifier	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Package / Case	SC-74A, SOT-753	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5	SOT-23-5 Thin, TSOT-23-5
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)
Product Status	Active	Active	Active	Active	Active	Active	Active	Not For New Designs

Engineering Selection Recommendations

Analog Devices LTC3406 Series (600mA Output Current)

The LTC3406ABES5-2#TRMPBF, LTC3406AES5#TRMPBF, LTC3406AES5#TRPBF, LTC3406B-2ES5#TRMPBF, and LTC3406BES5#TRMPBF represent the closest electrical equivalents to the RT8024GB. All variants maintain identical input/output voltage specifications, synchronous rectification, and operating temperature range. The LTC3406 series offers superior moisture sensitivity rating (MSL 1 vs. MSL 3), providing enhanced reliability in high-humidity manufacturing and storage environments. Switching frequency variations (1.5MHz and 2.25MHz) allow frequency-dependent design optimization. All LTC3406 variants carry Active product status, supporting long-term design continuity.

Diodes Incorporated AP3429 Series (2A Output Current)

The AP3429AKTTR-G1 and AP3429KTTR-G1 provide higher output current capability (2A) while maintaining full electrical compatibility across voltage specifications and operating temperature range. These devices support applications requiring increased current headroom. The AP3429AKTTR-G1 maintains Active product status for new designs. The AP3429KTTR-G1 carries "Not For New Designs" status, limiting its use to legacy system support or replacement applications only.

Selection Criteria

For new designs requiring direct RT8024GB replacement, select from the LTC3406 series (Analog Devices) or AP3429AKTTR-G1 (Diodes Incorporated). The LTC3406 series is preferred for applications sensitive to moisture exposure due to superior MSL rating. The AP3429AKTTR-G1 is suitable when higher current capacity (2A) provides design margin benefits. Avoid AP3429KTTR-G1 for new designs due to obsolescence status.

Frequently Asked Questions (FAQ)

Q: Can the LTC3406 series directly replace the RT8024GB without PCB modifications?

A: Yes. The LTC3406 series maintains identical SOT-23-5 package pinout, input/output voltage ranges (2.5V to 5.5V input, 0.6V to 5.5V adjustable output), and operating temperature specifications (-40°C to 85°C). No PCB layout changes are required. External component values (feedback resistors, input/output capacitors) remain unchanged.

Q: What is the significance of the MSL rating difference between RT8024GB (MSL 3) and LTC3406 series (MSL 1)?

A: MSL (Moisture Sensitivity Level) indicates the maximum time a component can be stored in ambient conditions before requiring baking. MSL 3 allows 168 hours of storage; MSL 1 allows unlimited storage. LTC3406 components tolerate extended warehouse and manufacturing environments without moisture-induced reliability degradation, reducing baking requirements and production delays.

Q: Are the AP3429 variants suitable for applications currently using RT8024GB?

A: The AP3429AKTTR-G1 is suitable for applications where 2A output current provides design margin above the RT8024GB's 400mA specification. Full electrical compatibility exists across voltage and temperature parameters. The AP3429KTTR-G1 should be used only for legacy system maintenance due to "Not For New Designs" status.

Q: How do switching frequency differences affect circuit design?

A: The RT8024GB operates at 1.5MHz; LTC3406B-2ES5#TRMPBF operates at 2.25MHz; other LTC3406 variants and AP3429 devices operate at 1.5MHz and 1MHz respectively. Higher switching frequency reduces output filter component size but increases switching losses. Lower frequency reduces losses but requires larger inductors and capacitors. Frequency selection depends on application power budget and PCB space constraints. Feedback network design remains independent of frequency selection.

Q: What packaging considerations apply when substituting with LTC3406 or AP3429 devices?

A: All substitute parts use SOT-23-5 or TSOT-23-5 (thin variant) packages, maintaining identical footprint compatibility with RT8024GB SC-74A (SOT-753) designs. TSOT-23-5 represents a thinner variant of standard SOT-23-5 with identical lead pitch and placement. No PCB redesign is required for package accommodation.

Q: Can RT8024GB be used as a substitute for LTC3406 or AP3429 in higher-current applications?

A: No. The RT8024GB is rated for 400mA maximum output current. Applications requiring 600mA (LTC3406 series) or 2A (AP3429 series) output current cannot use RT8024GB as a substitute due to insufficient current capacity and potential thermal stress.

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