AP1122DG-13 Equivalent & Substitute Parts

Part Overview

The AP1122DG-13 is a linear voltage regulator IC from Diodes Incorporated designed for positive fixed 1.2V output at 1A current capacity in a TO-252-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides regulated power management with integrated over-current and over-temperature protection suitable for low-voltage applications requiring stable 1.2V rails.

Substiute Parts

AP1122DG-13

Diodes IncorporatedIn Stock: 30392AP1122DG-13 Datasheet

Current PartRFQ

AZ1117CD-1.2TRG1

Diodes IncorporatedIn Stock: 25447AZ1117CD-1.2TRG1 Datasheet

MFR RecommendedRFQ

AP1122DL-13

Diodes IncorporatedIn Stock: 1517AP1122DL-13 Datasheet

Parametric EquivalentRFQ

LD1117ADT12TR

STMicroelectronicsIn Stock: 6673LD1117ADT12TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AP1122DG-13 is determined by the following critical parameters:

• Fixed output voltage of 1.2V
• Output current capability of 1A minimum
• Surface mount TO-252-3 package compatibility
• Positive output configuration
• Over-current and over-temperature protection features
• RoHS3 compliance

Substitute parts are grouped into two categories based on their relationship to the original specification:

Parametric Equivalent: AP1122DL-13 maintains identical electrical specifications and protection features as the AP1122DG-13, differing only in product status (Active vs. Obsolete) and packaging format.

Manufacturer Recommended Substitutes: AZ1117CD-1.2TRG1 and LD1117ADT12TR provide functional equivalence with relaxed input voltage ratings and modified protection feature sets while maintaining the core 1.2V/1A output specification and TO-252-3 package footprint.

Parameter Comparison

Engineering Selection Recommendations

AP1122DL-13 is the direct parametric equivalent for AP1122DG-13 replacement. Both parts are manufactured by Diodes Incorporated with identical electrical specifications, protection features, and operating temperature range. The primary distinction is product status: AP1122DL-13 is Active with current manufacturing support, while AP1122DG-13 is Obsolete. This part is recommended for designs requiring exact specification matching with assured long-term availability.

AZ1117CD-1.2TRG1 is a manufacturer-recommended substitute offering extended input voltage tolerance (15V maximum vs. 12V) and improved PSRR performance (70dB vs. 60dB). The protection feature set differs, providing thermal shutdown instead of discrete over-current protection. This part supports extended operating temperature range (-20°C to 125°C) and reduced quiescent current (6 mA vs. 10 mA). Selection is appropriate for applications with higher input voltage headroom requirements or lower power consumption priorities.

LD1117ADT12TR from STMicroelectronics is a manufacturer-recommended substitute providing the highest PSRR performance (80dB) and extended input voltage rating (15V maximum). This part maintains identical dropout voltage and quiescent current specifications as the original AP1122DG-13 while offering superior noise rejection characteristics. All three substitute parts maintain RoHS3 compliance and TO-252-3 package compatibility.

Frequently Asked Questions (FAQ)

Q: Can AP1122DL-13 be used as a direct replacement for AP1122DG-13?

A: Yes. AP1122DL-13 is a parametric equivalent with identical electrical specifications, output voltage, current rating, dropout voltage, quiescent current, PSRR, protection features, and operating temperature range. The only difference is product status (Active vs. Obsolete) and packaging format. Footprint and pinout are identical.

Q: What are the key differences between the manufacturer-recommended substitutes?

A: AZ1117CD-1.2TRG1 and LD1117ADT12TR both support higher input voltage (15V vs. 12V) and offer improved PSRR performance. AZ1117CD-1.2TRG1 provides lower quiescent current (6 mA) and extended temperature range (-20°C to 125°C). LD1117ADT12TR offers the highest PSRR (80dB) and maintains identical quiescent current to the original part. Both maintain over-current and over-temperature protection.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the TO-252-3 DPAK package with identical pinout and footprint compatibility. Surface mount placement and PCB layout remain unchanged.

Q: Do all substitute parts meet RoHS3 compliance?

A: Yes. AP1122DL-13, AZ1117CD-1.2TRG1, and LD1117ADT12TR are all ROHS3 compliant with REACH Unaffected status, matching the original AP1122DG-13 regulatory requirements.

Q: Which substitute should be selected for noise-sensitive applications?

A: LD1117ADT12TR provides the highest PSRR specification at 80dB (120Hz), making it the optimal choice for applications requiring superior power supply rejection ratio performance.

Q: What is the impact of different protection features on circuit design?

A: AP1122DG-13 and AP1122DL-13 provide discrete over-current and over-temperature protection. AZ1117CD-1.2TRG1 provides thermal shutdown protection. LD1117ADT12TR maintains over-current and over-temperature protection. Protection feature differences do not affect circuit topology but may influence thermal management considerations in high-current or high-ambient-temperature environments.