Diodes Incorporated PT7M8218B30TAE

Overview

PT7M8218B30TAE from Pericom Semiconductor is a 300mA, high-PSRR low-dropout regulator with 3.0V fixed output voltage, ±2% initial accuracy, 150mV dropout at 150mA, and 75dB PSRR at 1kHz. It operates from 1.7V to 5.5V input and delivers stable power to noise-sensitive RF and baseband circuits in portable wireless devices.

For engineers reviewing the PT7M8218B30TAE datasheet, PT7M8218B30TAE pinout, PT7M8218B30TAE application, or PT7M8218B30TAE equivalent, key selection criteria include guaranteed 300mA load capability, auto output discharge, thermal shutdown at 170°C, low 36µA quiescent current, and compatibility with 0.47µF ceramic capacitors.

Technical Context

The PT7M8218B30TAE integrates a P-channel MOSFET pass element, error amplifier with internal phase compensation, reference voltage source, and protection circuitry including current limit (400mA typical) and thermal shutdown (170°C). Its EN pin enables high-active control of output regulation.

It achieves stability with ultra-low-ESR 0.47µF X5R/X7R ceramic capacitors on both input and output, eliminating need for larger tantalum or aluminum electrolytics. The device maintains ±100ppm/°C output voltage drift over –40°C to +85°C ambient range.

Key Specifications

Pinout & Package

PT7M8218B30TAE is packaged in RoHS-compliant, lead-free SOT23-5L (JEDEC MO-178C/AA), measuring 2.82–3.02mm × 1.50–1.70mm × 1.05–1.25mm, with 0.95mm pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6206P302MR and RT9193-30GB, PT7M8218B30TAE uniquely combines EN control, auto-discharge, 75dB PSRR, and 36µA IQ in a single SOT23-5L package - making it optimal for space-constrained, multi-rail portable designs requiring robust power sequencing and low-noise operation.

Availability

PT7M8218B30TAE is available at Aetrix Electronics and suitable for cellular baseband power, GSM/CDMA RF transceiver bias, and digital still camera sensor interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PT7M8218B30TAE 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) specialized in high-performance interface, timing, and power management ICs for communications, computing, and consumer electronics before its 2016 acquisition.

The PT7M8218 belongs to Pericom's precision LDO family designed specifically for battery-powered portable devices demanding ultra-low IQ, high PSRR, and compact packaging - targeting mobile phones, PDAs, and digital cameras.

FAQ

What is the minimum input voltage required to maintain 3.0V output at 300mA load?

The PT7M8218B30TAE requires VIN ≥ 3.15V to sustain 3.0V output at full 300mA load, based on its maximum dropout voltage of 150mV at 150mA and confirmed 180mV worst-case dropout for VOUT ≤2.7V. At 300mA, typical dropout remains below 200mV, so 3.2V input provides safe margin across temperature and process variation.

Can the NC pin (Pin 4) be left floating in production design?

Yes, Pin 4 (NC) may be left unconnected per datasheet, but Pericom recommends tying it to GND to improve mechanical reliability during reflow and reduce potential EMI coupling. No electrical function is associated with this pin, and floating operation does not affect regulation performance or stability.

Does PT7M8218B30TAE require an input capacitor, and if so, what value and type?

Yes - a 0.47µF X5R or X7R ceramic capacitor must be placed between VIN and GND, located within 2mm of the IC pins. This capacitor stabilizes the input rail during load transients and prevents oscillation due to wiring inductance; tantalum or electrolytic types are not recommended due to higher ESR and instability risk.

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

When EN is pulled LOW, the internal 50Ω discharge path between VOUT and GND activates immediately, discharging a 0.47µF output capacitor from 3.0V to <0.5V in under 1ms. This prevents unintended operation of downstream logic and eliminates need for external bleed resistors in power-sequenced systems.