AP1122EG-U Equivalent & Substitute Parts

Part Overview

The AP1122EG-U is a linear voltage regulator IC manufactured by Diodes Incorporated, designed for positive fixed 1.2V output at 1A current capacity in SOT-223-3 surface mount packaging. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production continuity. Substitute parts must maintain electrical compatibility across output voltage, current capacity, dropout voltage, and thermal protection characteristics while accommodating packaging variations.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP1122EG-U
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Description	IC REG LINEAR 1.2V 1A SOT223-3
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	1.2V
Voltage - Input (Max)	12V
Current - Output	1A
Voltage Dropout (Max)	1.3V @ 1A
Current - Quiescent (Iq)	10 mA
PSRR	60dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature	0°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-261-4, TO-261AA
Supplier Device Package	SOT-223-3
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the AP1122EG-U are qualified based on the following electrical and mechanical compatibility criteria:

Critical Matching Parameters:

Output voltage: 1.2V fixed
Output current capacity: 1A minimum
Output configuration: Positive
Protection features: Over Current and Over Temperature
Mounting type: Surface Mount
Package compatibility: SOT-223 family (SOT-223-3 or SOT-223-4)
RoHS3 compliance
MSL rating: 1 (Unlimited)

Allowable Variations:

Input voltage maximum: May be lower than 12V (5.5V acceptable for reduced input range applications)
Quiescent current: May be higher than 10 mA
PSRR: May be higher than 60dB
Operating temperature range: May be extended beyond 0°C ~ 125°C
Packaging format: Cut Tape, Tape & Reel, or Digi-Reel acceptable

The TLV1117LV12DCYR and TLV1117LV12DCYT from Texas Instruments meet all critical electrical parameters and compliance requirements, with packaging differences reflecting distribution format variations rather than functional differences.

Parameter Comparison

Parameter	AP1122EG-U	TLV1117LV12DCYR	TLV1117LV12DCYT
Manufacturer	Diodes Incorporated	Texas Instruments	Texas Instruments
Output Voltage (Fixed)	1.2V	1.2V	1.2V
Current - Output	1A	1A	1A
Voltage - Input (Max)	12V	5.5V	5.5V
Voltage Dropout (Max)	1.3V @ 1A	1.3V @ 800mA	1.3V @ 800mA
Current - Quiescent (Iq)	10 mA	100 µA	100 µA
PSRR	60dB (120Hz)	75dB (120Hz)	75dB (120Hz)
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature
Operating Temperature	0°C ~ 125°C (TJ)	-40°C ~ 125°C	-40°C ~ 125°C
Supplier Device Package	SOT-223-3	SOT-223-4	SOT-223-4
Product Status	Obsolete	Last Time Buy	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both TLV1117LV12DCYR and TLV1117LV12DCYT are qualified substitutes for the obsolete AP1122EG-U based on electrical parameter compatibility and regulatory compliance. Selection between these two alternatives depends on procurement and assembly requirements:

TLV1117LV12DCYR is supplied in Cut Tape (CT) & Digi-Reel format with 340,149 units in stock, suitable for high-volume production environments requiring reel-based automated assembly.

TLV1117LV12DCYT is supplied in Tape & Reel (TR) format with 4,076 units in stock, appropriate for standard tape-and-reel assembly processes.

Both parts carry Last Time Buy status from Texas Instruments, indicating limited future availability. The reduced input voltage maximum (5.5V versus 12V) requires verification that application input voltage does not exceed this specification. The improved quiescent current (100 µA versus 10 mA) and PSRR (75dB versus 60dB) represent performance enhancements. Extended operating temperature range (-40°C to 125°C versus 0°C to 125°C) provides broader environmental coverage. SOT-223-4 packaging is mechanically compatible with SOT-223-3 footprints in standard surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can TLV1117LV12DCYR and TLV1117LV12DCYT be used interchangeably?

A: Yes. Both parts are electrically identical and differ only in packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Selection depends on assembly equipment and procurement preferences.

Q: What is the primary difference between AP1122EG-U and the substitute parts?

A: The AP1122EG-U accepts input voltages up to 12V, while TLV1117LV12DCYR and TLV1117LV12DCYT are rated for maximum 5.5V input. Applications requiring higher input voltages cannot use these substitutes. All other electrical parameters are compatible.

Q: Are the SOT-223-3 and SOT-223-4 packages footprint compatible?

A: SOT-223-4 is mechanically compatible with SOT-223-3 footprints in standard surface mount applications. The fourth pin in SOT-223-4 provides an additional ground connection for improved thermal performance.

Q: What does "Last Time Buy" status mean?

A: Last Time Buy indicates that Texas Instruments will discontinue these parts after a specified date. Existing inventory should be evaluated for long-term supply planning.

Q: Do all three parts meet RoHS3 compliance?

A: Yes. AP1122EG-U, TLV1117LV12DCYR, and TLV1117LV12DCYT are all ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: What is the impact of the lower quiescent current in substitute parts?

A: The TLV1117LV12DCYR and TLV1117LV12DCYT have quiescent current of 100 µA compared to 10 mA in the AP1122EG-U. This represents improved power efficiency in standby or low-load conditions.

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