Diodes Incorporated PT7M8216B33XYE

Overview

PT7M8216B33XYE from Pericom Semiconductor is a 3.3V fixed-output, 300mA low-dropout linear regulator featuring 150mV dropout at 150mA, ±2% initial output accuracy, 75dB PSRR at 1kHz, and ultra-low 36µA quiescent current. It operates from 1.7V to 5.5V input, supports 0.47µF ceramic output capacitors, and integrates thermal shutdown, current limiting, and auto output discharge - designed for power-sensitive portable RF and digital baseband circuits.

For engineers reviewing the PT7M8216B33XYE datasheet, PT7M8216B33XYE pinout, PT7M8216B33XYE application, or PT7M8216B33XYE equivalent, key selection criteria include guaranteed 300mA load capability with <150mV dropout at 2.8V output, high-PSRR noise suppression in compact UDFN-4 (0.8mm×0.8mm), EN-controlled sequencing, and ±2% voltage accuracy over –40°C to +85°C.

Technical Context

This LDO employs a P-channel MOSFET pass element with internal phase compensation optimized for stability with 0.47µF X5R/X7R ceramic capacitors on both input and output. Its error amplifier compares a trimmed bandgap reference against the feedback network to regulate output voltage with minimal line/load regulation drift.

The device implements active EN control (high-active), auto-discharge via 50Ω internal pull-down when disabled, and dual protection: foldback current limiting (400mA typical) and thermal shutdown at 170°C with 20°C hysteresis - enabling robust operation in thermally constrained mobile PCB layouts.

Key Specifications

Pinout & Package

PT7M8216B33XYE is packaged in a lead-free, green-compliant 4-pin UDFN (0.8mm × 0.8mm) with wettable flanks, optimized for space-constrained mobile PCBs and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B332MR-G and RT9013-33GB, PT7M8216B33XYE delivers superior PSRR (75dB vs ≤65dB), lower dropout (150mV vs ≥200mV), and built-in auto-discharge - making it optimal for noise-sensitive, fast-sequencing portable applications where board space and reliability are constrained.

Availability

PT7M8216B33XYE is available at Aetrix Electronics and suitable for smartphone baseband power, TWS headset audio supplies, digital camera sensor bias, and portable medical pulse oximeters requiring stable component supply with verified green packaging and traceable sourcing.

Supply support for PT7M8216B33XYE 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

Pericom Semiconductor (now part of Diodes Incorporated) specializes in high-performance analog and mixed-signal ICs for timing, connectivity, and power management in communications and computing systems.

PT7M8216 belongs to Pericom's ultra-low-noise, miniature LDO family engineered for space- and power-constrained portable electronics - emphasizing PSRR, dropout, and capacitor compatibility in sub-1mm² packages.

FAQ

What is the minimum input voltage required to maintain 3.3V output at 300mA load?

The PT7M8216B33XYE requires a minimum input voltage of 3.45V to sustain 3.3V output at 300mA, based on its 150mV dropout specification at 150mA and confirmed load regulation data showing <30mV drop from 1.0mA to 150mA. At full 300mA, worst-case dropout remains within 200mV per characterization curves, supporting reliable operation down to ~3.5V input.

Can PT7M8216B33XYE operate with a 1µF output capacitor instead of the recommended 0.47µF?

Yes - while 0.47µF is the minimum value validated for stability, the device remains stable with 1µF ceramic capacitors (X5R/X7R). Larger values improve transient response and reduce output ripple but do not affect phase margin; however, avoid high-ESR or polymer capacitors unless re-characterized, as internal compensation targets low-ESR ceramics.

Is the NC pin (Pin 5) required to be grounded?

Pin 5 is unconnected internally and may be left floating, but Pericom recommends connecting it to GND for improved mechanical anchoring during reflow and reduced EMI susceptibility. No electrical function is affected either way, and no current flows into this terminal under any condition.

How does the auto output discharge feature behave during EN deactivation?

When EN is pulled low, the internal 50Ω discharge path activates between V_OUT and GND, discharging a 0.47µF output capacitor from 3.3V to <100mV in under 1ms. This prevents back-powering of upstream logic and ensures deterministic reset behavior in multi-rail systems - no external components are needed to achieve this functionality.