AP1115BY28G-13 Equivalent & Substitute Parts

Part Overview

The AP1115BY28G-13 is a linear voltage regulator IC from Diodes Incorporated, delivering a fixed 2.8V output at 600mA in a SOT-89-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device is designed for applications requiring stable low-voltage regulation with integrated over-current and over-temperature protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.8V
Output Current	600mA
Input Voltage (Max)	18V
Voltage Dropout (Max)	1.3V @ 600mA
Quiescent Current	10mA
Package	SOT-89-3 (TO-243AA)
Operating Temperature	0°C to 125°C
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitution for the AP1115BY28G-13 is determined by the following critical parameters: fixed 2.8V output voltage, SOT-89-3 package compatibility, positive output configuration, and surface mount mounting type. All substitute parts must maintain these core specifications to ensure direct replacement capability.

The substitute parts are grouped into two categories:

Parametric Equivalent: AP1115BY28L-13 matches all electrical and mechanical specifications of the main part, with identical output voltage, current rating, package, and protection features. The primary difference is product status (discontinued at DiGi Electronics versus obsolete).

Manufacturer Recommended Alternatives: MCP1703AT-2802E/MB and RT9166-28GX provide functional equivalence with the same 2.8V output and SOT-89-3 package, but with variations in output current capacity, input voltage range, and quiescent current specifications.

Parameter Comparison

Parameter	AP1115BY28G-13	AP1115BY28L-13	MCP1703AT-2802E/MB	RT9166-28GX
Manufacturer	Diodes Incorporated	Diodes Incorporated	Microchip Technology	Richtek USA Inc.
Output Voltage	2.8V	2.8V	2.8V	2.8V
Output Current	600mA	600mA	250mA	300mA
Input Voltage (Max)	18V	18V	16V	5.5V
Voltage Dropout (Max)	1.3V @ 600mA	1.3V @ 600mA	0.975V @ 250mA	0.23V @ 300mA (Typ)
Quiescent Current	10mA	10mA	5µA	300µA
PSRR	60dB (120Hz)	60dB (120Hz)	35dB (100Hz)	55dB (1kHz)
Package	SOT-89-3	SOT-89-3	SOT-89-3	SOT-89-3
Operating Temperature	0°C to 125°C	0°C to 125°C	-40°C to 125°C	-40°C to 85°C
Product Status	Obsolete	Discontinued at DiGi Electronics	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AP1115BY28L-13 is the direct parametric equivalent and should be the first choice for replacement. It maintains identical electrical specifications and package configuration, with the same output current capacity of 600mA and input voltage range of 18V maximum. Both parts share ROHS3 compliance and identical protection features.

MCP1703AT-2802E/MB is suitable for applications where output current requirements do not exceed 250mA. This part offers active product status and extended operating temperature range (-40°C to 125°C). The significantly lower quiescent current (5µA versus 10mA) provides advantages in battery-powered applications. However, the reduced output current capacity and lower maximum input voltage (16V) must be verified against circuit requirements.

RT9166-28GX is applicable for designs with maximum output current requirements of 300mA and input voltages limited to 5.5V. This part features the lowest voltage dropout (0.23V typical at 300mA) and active product status. The operating temperature range is limited to -40°C to 85°C, which may restrict use in high-temperature environments. The higher quiescent current (300µA) should be considered in low-power applications.

All substitute parts maintain SOT-89-3 package compatibility, enabling direct PCB footprint replacement without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can AP1115BY28L-13 be used as a direct replacement for AP1115BY28G-13?

A: Yes. AP1115BY28L-13 is a parametric equivalent with identical output voltage (2.8V), output current (600mA), input voltage range (18V max), package (SOT-89-3), and protection features. The parts are electrically and mechanically interchangeable.

Q: What are the limitations when substituting with MCP1703AT-2802E/MB?

A: The MCP1703AT-2802E/MB has a reduced output current rating of 250mA compared to the original 600mA specification. Applications requiring current above 250mA cannot use this substitute. Additionally, the maximum input voltage is 16V versus 18V for the original part. Verify circuit requirements before selection.

Q: Is RT9166-28GX suitable for all applications using AP1115BY28G-13?

A: RT9166-28GX is limited to applications with maximum input voltages of 5.5V and output currents not exceeding 300mA. The original part supports 18V input and 600mA output. Confirm input voltage and current requirements before substitution. The operating temperature range is also limited to -40°C to 85°C.

Q: Are all substitute parts RoHS compliant?

A: Yes. AP1115BY28L-13, MCP1703AT-2802E/MB, and RT9166-28GX are all ROHS3 compliant, matching the compliance status of the original AP1115BY28G-13.

Q: Do the substitute parts require PCB layout changes?

A: No. All substitute parts use the SOT-89-3 package (TO-243AA), maintaining identical pin configuration and footprint compatibility with the original part. No PCB modifications are necessary.

Q: Which substitute part has the best availability?

A: MCP1703AT-2802E/MB and RT9166-28GX are both active products with current manufacturing status, providing superior long-term availability compared to the obsolete AP1115BY28G-13 and discontinued AP1115BY28L-13.

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