AP1122EG-13 Equivalent & Substitute Parts

Part Overview

The AP1122EG-13 is a linear voltage regulator IC from Diodes Incorporated, designed to deliver a fixed 1.2V output at 1A in a surface-mount SOT-223-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part provides positive fixed output regulation with integrated over-current and over-temperature protection, suitable for low-voltage power management applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP1122EG-13
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Output Voltage (Fixed)	1.2V
Output Current	1A
Input Voltage (Max)	12V
Dropout Voltage (Max)	1.3V @ 1A
Quiescent Current	10 mA
PSRR	60dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature Range	0°C ~ 125°C
Package Type	SOT-223-3
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AP1122EG-13 are qualified based on the following critical parameters:

Fixed output voltage of 1.2V
Output current capability of 1A minimum
Dropout voltage of 1.3V @ 1A or lower
Surface-mount SOT-223 package family
Over-current and over-temperature protection
ROHS3 compliance
Operating temperature range of 0°C to 125°C minimum

The substitute parts identified are grouped into two categories: direct functional equivalents and manufacturer-recommended alternatives. All substitutes maintain the core electrical specifications required for 1.2V, 1A linear regulation while accommodating minor variations in input voltage ratings and quiescent current characteristics.

Parameter Comparison

Parameter	AP1122EG-13 (Diodes)	LD1117AS12TR (STMicroelectronics)	TLV1117LV12DCYR (Texas Instruments)	TLV1117LV12DCYT (Texas Instruments)
Output Voltage (Fixed)	1.2V	1.2V	1.2V	1.2V
Output Current	1A	1A	1A	1A
Input Voltage (Max)	12V	15V	5.5V	5.5V
Dropout Voltage (Max)	1.3V @ 1A	1.3V @ 1A	1.3V @ 800mA	1.3V @ 800mA
Quiescent Current	10 mA	10 mA	100 µA	100 µA
PSRR (120Hz)	60dB	80dB	75dB	75dB
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature
Operating Temperature Range	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package Type	SOT-223-3	SOT-223	SOT-223-4	SOT-223-4
Product Status	Obsolete	Active	Last Time Buy	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LD1117AS12TR (STMicroelectronics) is the primary direct substitute. This part maintains identical electrical specifications to the AP1122EG-13, including 1A output current, 1.3V dropout voltage, and 10 mA quiescent current. The LD1117AS12TR accepts a higher maximum input voltage (15V vs. 12V), providing greater design margin. Product status is Active, ensuring long-term availability. ROHS3 compliance and identical operating temperature range (0°C ~ 125°C) confirm full compatibility.

TLV1117LV12DCYR and TLV1117LV12DCYT (Texas Instruments) are manufacturer-recommended alternatives with enhanced performance characteristics. Both parts feature lower quiescent current (100 µA vs. 10 mA), superior PSRR (75dB vs. 60dB), and extended operating temperature range (-40°C ~ 125°C). However, these parts have a reduced maximum input voltage (5.5V vs. 12V), requiring circuit design verification for applications exceeding this input limit. Both are ROHS3 compliant. TLV1117LV12DCYR is supplied in Cut Tape & Digi-Reel packaging, while TLV1117LV12DCYT is supplied in Tape & Reel format. Both carry Last Time Buy status.

For applications requiring maximum input voltage tolerance and immediate availability, LD1117AS12TR is recommended. For applications prioritizing low quiescent current and extended temperature range, TLV1117LV12DCYR or TLV1117LV12DCYT are suitable, provided input voltage does not exceed 5.5V.

Frequently Asked Questions (FAQ)

Q: Can LD1117AS12TR directly replace AP1122EG-13 without circuit modification?

A: Yes. The LD1117AS12TR maintains identical output voltage (1.2V), output current (1A), dropout voltage (1.3V @ 1A), and quiescent current (10 mA). Both use SOT-223 package family with compatible pinouts. No circuit modification is required.

Q: What is the key difference between LD1117AS12TR and the Texas Instruments alternatives?

A: The LD1117AS12TR accepts input voltages up to 15V, matching the original AP1122EG-13 specification of 12V maximum input. The TLV1117LV12DCYR and TLV1117LV12DCYT are limited to 5.5V maximum input voltage. If your circuit supplies input voltage above 5.5V, only LD1117AS12TR is suitable.

Q: Why do TLV1117LV12DCYR and TLV1117LV12DCYT have lower quiescent current?

A: These Texas Instruments parts feature advanced process technology resulting in 100 µA quiescent current versus 10 mA for the original and LD1117AS12TR. This reduces standby power consumption in battery-powered applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. AP1122EG-13, LD1117AS12TR, TLV1117LV12DCYR, and TLV1117LV12DCYT are all ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: What is the difference between TLV1117LV12DCYR and TLV1117LV12DCYT packaging?

A: TLV1117LV12DCYR is supplied in Cut Tape & Digi-Reel format. TLV1117LV12DCYT is supplied in Tape & Reel format. Electrical specifications are identical; packaging selection depends on procurement and assembly requirements.

Q: Can I use these substitutes in applications requiring 0°C to 125°C operation?

A: Yes. All substitute parts support the 0°C to 125°C operating range. TLV1117LV12DCYR and TLV1117LV12DCYT additionally support extended range to -40°C.

Q: What is the product status significance for long-term design?

A: LD1117AS12TR carries Active status, ensuring indefinite availability. TLV1117LV12DCYR and TLV1117LV12DCYT carry Last Time Buy status, indicating limited future availability. For new designs requiring long-term production support, LD1117AS12TR is preferred.

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