AP139-28WG-7 Equivalent & Substitute Parts

Part Overview

The AP139-28WG-7 is a linear voltage regulator IC from Diodes Incorporated, classified as a Power Management (PMIC) component. This device delivers a fixed 2.8V output at 300mA with integrated protection features including over-current, over-temperature, and short-circuit protection. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this specific voltage regulation functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP139-28WG-7
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Output Voltage (Fixed)	2.8V
Output Current	300mA
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.45V @ 300mA
Quiescent Current	60 µA
Package Type	SOT-25 (SC-74A, SOT-753)
Operating Temperature Range	-40°C ~ 85°C
Protection Features	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitute parts for the AP139-28WG-7 are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Fixed output voltage of 2.8V
Output current capability of 300mA
SOT-25 package configuration
Operating temperature range of -40°C to 85°C
Surface mount mounting type
Positive output configuration with single regulator

Parts are grouped into two categories: MFR Recommended substitutes and Parametric Equivalents. MFR Recommended substitutes represent manufacturer-approved alternatives with potentially improved specifications. Parametric Equivalents maintain identical electrical characteristics to the main part.

Parameter Comparison

Parameter	AP139-28WG-7	AP7343-28W5-7	AP139-28WL-7
Manufacturer	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Output Voltage	2.8V	2.8V	2.8V
Output Current	300mA	300mA	300mA
Input Voltage (Max)	5.5V	5.25V	5.5V
Voltage Dropout (Max)	0.45V @ 300mA	0.3V @ 300mA	0.45V @ 300mA
Quiescent Current	60 µA	60 µA	60 µA
Package	SOT-25	SOT-25	SOT-25
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current	Over Current, Over Temperature, Short Circuit
Product Status	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the AP139-28WG-7, the following selection criteria apply:

AP139-28WL-7 is a direct parametric equivalent with identical electrical specifications and protection feature set. This part maintains Active product status, ensuring long-term availability and supply chain stability. Selection of AP139-28WL-7 is appropriate for designs requiring no specification changes and maximum compatibility with existing schematics and layouts.

AP7343-28W5-7 is the manufacturer-recommended substitute with Active product status. This part offers improved voltage dropout performance (0.3V versus 0.45V at 300mA), resulting in lower power dissipation and improved efficiency in applications with tight input voltage margins. The maximum input voltage specification is reduced to 5.25V. This part includes over-current protection but does not specify over-temperature and short-circuit protection features. Selection of AP7343-28W5-7 is appropriate for new designs or redesigns where improved dropout performance is beneficial and the reduced protection feature set is acceptable for the application.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and identical package configuration, ensuring PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can AP139-28WL-7 be used as a direct replacement for AP139-28WG-7?

A: Yes. AP139-28WL-7 is a parametric equivalent with identical output voltage, output current, voltage dropout, quiescent current, operating temperature range, and protection features. Both parts use SOT-25 packaging and are pin-compatible. The primary difference is product status: AP139-28WL-7 is Active while AP139-28WG-7 is Last Time Buy.

Q: What are the advantages of AP7343-28W5-7 over AP139-28WG-7?

A: AP7343-28W5-7 offers reduced voltage dropout (0.3V versus 0.45V at 300mA), resulting in lower power dissipation and improved thermal performance. This part is manufacturer-recommended and maintains Active product status for long-term availability. The trade-off is a reduced maximum input voltage specification (5.25V versus 5.5V) and a reduced protection feature set (over-current protection only, versus over-current, over-temperature, and short-circuit protection).

Q: Are all substitute parts in the same package?

A: Yes. AP139-28WG-7, AP7343-28W5-7, and AP139-28WL-7 all use SOT-25 packaging (SC-74A, SOT-753 case designation). Pin configuration and PCB footprint are identical, allowing direct board-level substitution without layout modifications.

Q: What is the significance of Last Time Buy status for AP139-28WG-7?

A: Last Time Buy status indicates that the manufacturer has ceased production and will not accept new orders after a specified date. Existing inventory may be available, but long-term supply cannot be guaranteed. Designs should transition to Active alternatives such as AP139-28WL-7 or AP7343-28W5-7 to ensure supply chain continuity.

Q: Which substitute part should be selected for a new design?

A: For new designs, AP139-28WL-7 is recommended if the application requires the full protection feature set (over-current, over-temperature, and short-circuit protection) and can tolerate the 0.45V dropout specification. AP7343-28W5-7 is recommended if improved efficiency from reduced dropout voltage is a design priority and the application does not require over-temperature and short-circuit protection features.

Q: Are all parts ROHS3 compliant?

A: Yes. AP139-28WG-7, AP7343-28W5-7, and AP139-28WL-7 are all ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating.

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