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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated AP2112R5A-1.2TRG1

Name: AP2112R5A-1.2TRG1
Brand: Diodes Incorporated
SKU: AP2112R5A-1.2TRG1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP2112R5A-1.2TRG1

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: SOT-89-5/6

Datasheet:: AP2112R5A-1.2TRG1.pdf

Description:: IC REG LINEAR 1.2V 600MA SOT89-5

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP2112R5A-1.2TRG1 from Diodes Incorporated is a fixed 1.2V, 600mA CMOS low-dropout linear regulator with enable control and auto-discharge functionality, delivering ±1.5% output accuracy, 250mV typical dropout at full load, and 50µV_RMS output noise. It operates across –40°C to +85°C and supports stable regulation with 1.0µF ceramic, tantalum, or aluminum electrolytic output capacitors in portable computing and display power rails.

For engineers reviewing the AP2112R5A-1.2TRG1 datasheet, AP2112R5A-1.2TRG1 pinout, AP2112R5A-1.2TRG1 application, or AP2112R5A-1.2TRG1 equivalent, key selection criteria include guaranteed 600mA output current, 0.02%/V line regulation, thermal shutdown at +160°C, EN logic compatibility (0–0.4V low, 1.5–6.0V high), and 60Ω VOUT discharge resistance during disable.

Technical Context

The AP2112R5A-1.2TRG1 implements a CMOS-based LDO architecture with internal voltage reference, error amplifier, and foldback current-limit protection (50mA short-circuit limit). Its fast loop response enables robust transient suppression for line and load steps in tightly regulated 1.2V domains.

It integrates an active pull-down on the EN pin (3.0MΩ internal resistor) and a dedicated 60Ω discharge path from VOUT to GND when disabled-critical for preventing back-powering in multi-rail systems. The device is specified for input voltages from 2.5V to 6.0V and maintains stability with minimal 1.0µF output capacitance.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.2V ±1.5% - ensures precise core voltage for low-voltage microcontrollers and memory interfaces
Max Output Current	600mA min. - sufficient for powering SoC cores, FPGAs, or DDR termination in portable devices
Dropout Voltage	250mV typ. @ 600mA - enables operation from 1.45V input, supporting battery-backed or cascaded supply designs
Quiescent Current	55µA typ. - minimizes standby power loss in always-on subsystems like real-time clocks or sensors
PSRR	–65dB @ 100Hz/1kHz - suppresses ripple from noisy switching supplies feeding the LDO input
Output Noise	50µV_RMS (10Hz–100kHz) - meets low-noise requirements for analog signal chains and RF bias rails
Enable Threshold	V_IL ≤ 0.4V, V_IH ≥ 1.5V - compatible with 1.8V/3.3V GPIO without level-shifting
Thermal Shutdown	+160°C with +25°C hysteresis - prevents latch-up during sustained overload or poor PCB thermal design

Pinout & Package

SOT89-5 (R5A) package: 5-pin surface-mount outline with exposed thermal pad (pin 3 NC, pin 5 EN), optimized for moderate-power thermal dissipation in space-constrained applications.

Pin/Terminal	Circuit Role	Design Meaning
1	VOUT	Regulated 1.2V output - connects directly to load; requires local 1.0µF ceramic capacitor
2	VIN	Input supply (2.5–6.0V) - must be filtered upstream to meet PSRR performance
3	NC	No connection - electrically isolated; no PCB trace or copper pour required
4	GND	Power ground return - must tie to low-impedance system ground plane for noise control
5	EN	Active-high enable - drives regulator ON/OFF; internal 3.0MΩ pull-down holds OFF at power-up

Key Features

Feature	Design Value
Auto-discharge function	60Ω internal VOUT-to-GND switch when EN = low - eliminates residual voltage on downstream circuitry during shutdown
Foldback current limiting	50mA short-circuit limit - protects IC and source supply during output faults without thermal runaway
Stability with flexible output cap	Works with 1.0µF ceramic/tantalum/aluminum - reduces BOM count and simplifies layout vs. traditional LDOs requiring >10µF
Low standby current	0.01µA typ. - enables multi-year battery life in maintenance-free IoT edge nodes
ESD robustness	HBM 4000V / MM 400V - withstands handling and board-level ESD events without external protection

Applications

Laptop Core Power

Portable Display Bias

Use Scenario: Supplying 1.2V core voltage to ARM Cortex-A series processors in ultrabooks with dynamic DVFS scaling.

IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise power to CPU VDD_CORE under rapid load transients.

Use Value: 20µs startup time and 0.2%/A load regulation ensure stable operation during burst-mode execution without brownouts.

Use Scenario: Providing bias voltage to LCD column drivers and timing controller ICs in 7–10 inch tablets.

IC Role / Device Role / Timing Role: Fixed-output LDO supplying stable 1.2V reference for analog pixel amplifiers and gamma correction circuits.

Use Value: 50µV_RMS noise and –65dB PSRR prevent visible flicker or grayscale distortion in high-resolution panels.

USB-C PD Sink Rail

Industrial Sensor Node

Use Scenario: Generating 1.2V auxiliary rail from negotiated 5V/9V USB-C PD bus for MCU and interface logic.

IC Role / Device Role / Timing Role: Secondary LDO converting switched-input to low-noise core voltage, enabled only when host negotiates power.

Use Value: EN pin compatibility with 3.3V GPIO and 0.01µA shutdown current extend battery runtime during USB suspend states.

Use Scenario: Powering ultra-low-power 32-bit MCU and MEMS accelerometer in battery-operated predictive maintenance sensor.

IC Role / Device Role / Timing Role: Always-on LDO maintaining RTC and wake-up circuitry while main processor sleeps.

Use Value: 55µA quiescent current and –40°C to +85°C rating support 10+ year field deployment in uncontrolled environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703T-1202E/MB	1.2V, 250mA max, 600mV dropout @ 250mA, no auto-discharge	Limited to lower-current peripherals; lacks VOUT discharge path for strict power sequencing	Select when cost sensitivity outweighs current capability and discharge requirement
Torex XC6210B122MR-G	1.2V, 500mA max, 160mV dropout @ 500mA, 1.0µF stable, no EN pin	Requires external enable circuitry; lower current margin for peak loads	Choose for footprint-constrained designs where EN control is not needed and 500mA suffices

Compared with MCP1703T-1202E/MB and XC6210B122MR-G, the AP2112R5A-1.2TRG1 uniquely combines 600mA drive, integrated EN logic, and 60Ω auto-discharge-making it optimal for portable systems requiring robust power sequencing, higher current headroom, and low-noise 1.2V rails without external components.

Availability

AP2112R5A-1.2TRG1 is available at Aetrix Electronics and suitable for laptop computer power management, portable display biasing, USB-C PD sink rails, and industrial sensor node power delivery requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP2112R5A-1.2TRG1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP2112 product line delivers high-accuracy, low-noise LDO regulators targeting portable electronics and embedded systems where compact size, thermal efficiency, and seamless power sequencing are critical.

FAQ

What is the minimum input voltage required for AP2112R5A-1.2TRG1 to regulate 1.2V output?

The recommended minimum input voltage is 2.5V per the datasheet's Recommended Operating Conditions. At 600mA load, the 250mV typical dropout requires VIN ≥ 1.45V, but 2.5V ensures full specification compliance-including line regulation, PSRR, and thermal margin-across temperature and process variation.

Does AP2112R5A-1.2TRG1 require an input capacitor?

Yes-an input capacitor (minimum 1.0µF ceramic) is required for stability and transient suppression. The datasheet specifies CIN = 1.0µF (X7R/X5R dielectric recommended) to maintain PSRR performance and prevent oscillation during fast load steps, especially when sourced from high-impedance or switching supplies.

Can AP2112R5A-1.2TRG1 be used with aluminum electrolytic output capacitors?

Yes-the device is explicitly characterized and guaranteed stable with 1.0µF aluminum electrolytic, tantalum, or ceramic output capacitors. Unlike many LDOs, it does not require specific ESR ranges, eliminating the need for ESR-tuning networks and simplifying capacitor selection for cost-sensitive or high-temperature applications.

How does the auto-discharge function behave during EN deactivation?

When EN is driven low, the internal 60Ω switch connects VOUT directly to GND, discharging the output capacitor rapidly. This prevents back-powering of upstream circuitry or unintended wake-up of downstream ICs. Discharge time depends on COUT value-for example, a 10µF capacitor discharges to <100mV in ~300µs (τ = R×C = 60Ω × 10µF).

AP2112R5A-1.2TRG1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-89-5/6

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 1.2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.3V @ 600mA

Current - Output:: 600mA

Current - Quiescent (Iq):: 80 µA

Current - Supply (Max):: -

PSRR:: 65sB (100Hz ~ 1KHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-5

AP2112R5A-1.2TRG1 FAQ

1.How can I place an order for AP2112R5A-1.2TRG1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP2112R5A-1.2TRG1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AP2112R5A-1.2TRG1 reliable?

The price and inventory of AP2112R5A-1.2TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP2112R5A-1.2TRG1 is usually 5 days.

3.What payment methods are accepted for AP2112R5A-1.2TRG1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP2112R5A-1.2TRG1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP2112R5A-1.2TRG1?

AP2112R5A-1.2TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP2112R5A-1.2TRG1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AP2112R5A-1.2TRG1?

For technical support, including AP2112R5A-1.2TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP2112R5A-1.2TRG1 requirements.

6.How does Aetrix verify that AP2112R5A-1.2TRG1 is sourced from the original manufacturer or authorized distributors?

All AP2112R5A-1.2TRG1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP2112R5A-1.2TRG1 meets industry standards.

7.What is the process for return or replacement of AP2112R5A-1.2TRG1?

All AP2112R5A-1.2TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP2112R5A-1.2TRG1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AP2112R5A-1.2TRG1 part is unused and in its original packaging.

Return procedure for AP2112R5A-1.2TRG1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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