Diodes Incorporated PAM3112GUA120

Overview

PAM3112GUA120 from Diodes Incorporated is a 1.2V fixed-output, 300mA CMOS low-dropout linear regulator in SC70-3 package, featuring 65µA typical quiescent current, ±2% output accuracy, and thermal shutdown with 150°C trip point-designed for battery-powered portable electronics such as Bluetooth earphones and digital cameras.

For engineers reviewing the PAM3112GUA120 datasheet, PAM3112GUA120 pinout, PAM3112GUA120 application, or PAM3112GUA120 equivalent, key selection criteria include dropout voltage (300mV typ), output stability with ≥2.2µF ceramic capacitors, EN pin control logic, BYP noise-filtering capability, and SC70-3 thermal resistance (θJA = 300°C/W).

Technical Context

The PAM3112GUA120 integrates a 0.75Ω P-channel MOSFET pass transistor enabling low ground current across load conditions and delivering stable 1.2V output with <60mV load regulation error over 1–300mA. Its internal 200kΩ–10nF RC filter on the BYP pin reduces output noise to 50µVRMS (10Hz–100kHz).

It operates within 2.5–5.5V input range, supports shutdown via active-high EN pin, and implements foldback current limiting (130mA short-circuit current) plus thermal shutdown with 30°C hysteresis-ensuring robust operation under transient overload and ambient temperatures from –40°C to +85°C.

Key Specifications

Pinout & Package

SC70-3 package: 1.2mm × 0.8mm footprint, 0.65mm pitch, 0.9mm max height; thermally optimized for space-constrained portable PCBs with θJA = 300°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2127 and MCP1700, the PAM3112GUA120 delivers the best balance of output current (300mA), quiescent current (65µA), and SC70-3 footprint-making it ideal for space-constrained, battery-powered applications where enable control is unnecessary.

Availability

PAM3112GUA120 is available at Aetrix Electronics and suitable for Bluetooth earphones, digital cameras, WLAN modules, and MP3 players requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for PAM3112GUA120 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 consumer, industrial, and computing markets.

The PAM3112 belongs to Diodes' precision LDO regulator product line, engineered specifically for portable electronics requiring low IQ, tight output tolerance, and robust thermal protection in miniature packages.

FAQ

What is the minimum input voltage required for PAM3112GUA120 to maintain 1.2V output at 300mA?

The PAM3112GUA120 requires a minimum input voltage of 1.5V to sustain 1.2V output at full 300mA load, based on its typical 300mV dropout voltage. At 25°C ambient and with proper PCB thermal design, it remains functional down to 1.5V input-enabling full utilization of single-cell Li-ion batteries from 4.2V to 1.5V discharge range.

Does PAM3112GUA120 include an enable (EN) pin?

No, the PAM3112GUA120 does not include an enable pin. The 'GUA' suffix denotes the SC70-3 package with pin configuration VIN–VOUT–GND (Type G), omitting EN and BYP terminals. This variant operates continuously when powered-ideal for always-on subsystems where external enable logic is unnecessary or handled upstream.

Can PAM3112GUA120 be used with aluminum polymer capacitors instead of ceramic?

No-PAM3112GUA120 is designed and characterized for stability with ceramic output capacitors ≥2.2µF and ESR >5mΩ. Aluminum polymer capacitors typically exhibit higher ESR and different frequency response, risking instability, overshoot, or oscillation. Ceramic capacitors are mandatory per the datasheet to ensure guaranteed phase margin and transient performance.

What is the maximum allowable power dissipation for PAM3112GUA120 in SC70-3 at 25°C ambient?

With θJA = 300°C/W and TJ(MAX) = 125°C, the maximum continuous power dissipation for PAM3112GUA120 at TA = 25°C is 333mW, calculated as (125°C − 25°C)/300°C/W. At 300mA load and 1.2V output, this limits usable input voltage to ≤2.3V to stay within safe thermal limits-requiring careful thermal design or derating above that point.