AP1121BSG-13 Equivalent & Substitute Parts

Part Overview

The AP1121BSG-13 is a linear voltage regulator IC from Diodes Incorporated designed for dual-output power management applications. This device provides positive fixed outputs at 1.8V and 3.3V with 1A output current per channel in an 8-SOP surface mount package. The part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	AP1121BSG-13
Category	Power Management (PMIC)
Product Status	Obsolete
Package Type	8-SOIC (0.154", 3.90mm Width)
Number of Regulators	2
Output Configuration	Positive Fixed
Voltage Output (Fixed)	1.8V, 3.3V
Current Output	1A, 1A
Voltage Input (Max)	18V
Voltage Dropout (Max)	1.4V @ 1A, 1.4V @ 1A
Operating Temperature	0°C ~ 125°C (TJ)
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the AP1121BSG-13 are qualified based on the following electrical and mechanical parameters:

Dual-output linear voltage regulator configuration (2 independent regulators)
Positive fixed output voltage topology
8-pin SOIC surface mount package with 0.154" (3.90mm) width
Output voltage options including 1.8V and/or 3.3V
Adequate current output capability for the application
Maximum input voltage rating of 16V or higher
Over current and over temperature protection features
RoHS3 compliance and MSL Level 1 rating
Active product status for long-term availability

The MIC5212 series from Microchip Technology meets these substitution criteria, though with reduced output current per channel (500mA vs. 1A) and different fixed voltage options (2.5V, 3.3V vs. 1.8V, 3.3V).

Parameter Comparison

Parameter	AP1121BSG-13	MIC5212-SJYM	MIC5212-SJYM-TR
Manufacturer	Diodes Incorporated	Microchip Technology	Microchip Technology
Product Status	Obsolete	Active	Active
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Number of Regulators	2	2	2
Output Configuration	Positive Fixed	Positive Fixed	Positive Fixed
Voltage Output (Fixed)	1.8V, 3.3V	2.5V, 3.3V	2.5V, 3.3V
Current Output	1A, 1A	500mA, 500mA	500mA, 500mA
Voltage Input (Max)	18V	16V	16V
Voltage Dropout (Max)	1.4V @ 1A, 1.4V @ 1A	0.6V @ 500mA, 0.6V @ 500mA	0.6V @ 500mA, 0.6V @ 500mA
Current - Quiescent (Iq)	10 mA	3 mA	3 mA
PSRR	60dB (120Hz)	75dB (120Hz)	75dB (120Hz)
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature, Reverse Polarity	Over Current, Over Temperature, Reverse Polarity
Operating Temperature	0°C ~ 125°C (TJ)	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Packaging Format	-	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

The MIC5212-SJYM and MIC5212-SJYM-TR are active, production-qualified alternatives to the obsolete AP1121BSG-13. Both variants share identical electrical specifications and differ only in packaging format (Tube vs. Tape & Reel).

Selection between these substitutes should be based on:

Packaging requirements: MIC5212-SJYM (Tube) for lower-volume applications; MIC5212-SJYM-TR (Tape & Reel) for high-volume manufacturing
Output current requirements: The MIC5212 series provides 500mA per channel versus 1A per channel on the AP1121BSG-13. Applications requiring full 1A output per channel must evaluate alternative solutions
Voltage output compatibility: The MIC5212 series offers 2.5V and 3.3V outputs. Applications requiring 1.8V output must confirm alternative voltage options or select a different device family
Operating temperature range: The MIC5212 series extends to -40°C, providing broader temperature coverage than the AP1121BSG-13 (0°C minimum)
Compliance: Both substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage requirements

Frequently Asked Questions (FAQ)

Q: Can the MIC5212 series directly replace the AP1121BSG-13 in all applications?

A: Direct replacement is possible only if the application requirements are compatible with reduced output current (500mA vs. 1A per channel) and the available voltage outputs (2.5V, 3.3V vs. 1.8V, 3.3V). Pin-to-pin compatibility exists due to identical 8-SOIC packaging, but electrical performance differs.

Q: What is the difference between MIC5212-SJYM and MIC5212-SJYM-TR?

A: Both parts are electrically identical. The difference is packaging format: MIC5212-SJYM is supplied in Tube packaging, while MIC5212-SJYM-TR is supplied in Tape & Reel format. Selection depends on manufacturing volume and assembly line requirements.

Q: Why does the AP1121BSG-13 have higher output current than the MIC5212?

A: The AP1121BSG-13 is rated for 1A per channel while the MIC5212 is rated for 500mA per channel. This is a fundamental design difference between the two device families and reflects different target applications.

Q: Are there voltage output compatibility issues?

A: Yes. The AP1121BSG-13 provides 1.8V and 3.3V outputs, while the MIC5212 provides 2.5V and 3.3V outputs. Applications requiring 1.8V output cannot use the MIC5212 series without circuit redesign or alternative component selection.

Q: What are the compliance and certification differences?

A: Both the AP1121BSG-13 and MIC5212 series are ROHS3 compliant with MSL Level 1 rating. The MIC5212 series includes reverse polarity protection as an additional feature not present in the AP1121BSG-13.

Q: Is the 8-SOIC package identical between these parts?

A: Yes. Both devices use the 8-SOIC package with 0.154" (3.90mm) width, ensuring mechanical and pin-to-pin compatibility. PCB layout modifications are not required for package accommodation.

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