AP2112K-3.3TRG1 3.3V 600mA Linear Voltage Regulator IC SOT-23-5

AP2112K-3.3TRG1 3.3V 600mA Linear Voltage Regulator IC (SOT-23-5) delivers a stable 3.3 V output for space-constrained power rails. Designers deploy it in sensors, MCUs, and wireless modules that need low dropout, low noise, and simple enable control.

Key Features:

• Fixed 3.3 V Output: Regulates logic rails and RF modules with tight tolerance.
• 600 mA Output Current: Drives moderate loads with reliable thermal protection.
• Low Dropout: Minimizes headroom at high load for battery-powered designs.
• Low Quiescent Current: Extends battery life in always-on systems.
• Enable Pin: Supports logic-controlled on/off for power sequencing.
• Thermal Shutdown & Current Limit: Protects against overload and overheating.
• Stable with Ceramic Capacitors: Works with small, low-ESR MLCCs at input and output.

Technical Specifications:

• Output Voltage: 3.3 V fixed
• Output Current: Up to 600 mA
• Input Voltage Range: ~2.3 V to 6.0 V (check datasheet for absolute limits)
• Dropout Voltage: Typically a few hundred mV at full load (refer to curves)
• Quiescent Current: Low IQ for battery use (typical value per datasheet)
• PSRR: High at low-to-mid frequencies for clean rails
• Protection: Current limit, short-circuit, and thermal shutdown
• Operating Temperature: −40 °C to +85 °C ambient (verify grade)

Mechanical Specifications:

• Package: SOT-23-5 (5-pin, small-outline transistor)
• Mounting: Surface-mount, reflow compatible
• Lead Finish: Matte-tin plated leads
• Body Material: Molded epoxy, RoHS compliant

Dimensions:

• Package Body: ~2.9 mm × ~1.6 mm
• Height: ~1.1 mm max
• Lead Pitch: 0.95 mm
• Recommended Pads: Follow manufacturer land pattern for SOT-23-5

Pinout and Wiring:

• Pin 1: GND – connect to system ground with solid return.
• Pin 2: EN – drive high to enable; pull low to disable. Tie to IN for always-on.
• Pin 3: IN – connect to supply; place a 1 µF (or higher) ceramic capacitor close to the pin.
• Pin 4: OUT – regulated 3.3 V output; place a 1 µF (or higher) ceramic capacitor close to the pin.
• Pin 5: BP/NC – on fixed versions, use as BYP for noise reduction with ~10 nF to GND if available; otherwise leave NC (check datasheet).
• Route short, wide traces for IN and OUT. Keep bypass and output capacitors close to the device.

Datasheet Reference:

• Search for “AP2112K-3.3TRG1 datasheet” from Diodes Incorporated to view full electrical characteristics, dropout curves, PSRR plots, and recommended layout.

Applications:

• MCU and Sensor Rails: Power 3.3 V logic and analog front-ends.
• Wireless and IoT Modules: Regulate BLE, Wi-Fi, and LoRa nodes.
• Battery-Powered Systems: Support wearables, handhelds, and portable instruments.
• Post-Regulation: Clean up switching-converter rails for sensitive loads.

Equivalent Models:

• MCP1703A-3302: 3.3 V LDO with low quiescent current (verify current rating and dropout).
• TLV70033: Compact 3.3 V LDO for light-to-moderate loads.
• XC6206P332MR: 3.3 V SOT-23 LDO alternative; confirm load capability.

Package Includes:

• 1 x AP2112K-3.3TRG1 Linear Voltage Regulator IC (SOT-23-5)