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

Diodes Incorporated PT7M8218B33CEX

Name: PT7M8218B33CEX
Brand: Diodes Incorporated
SKU: PT7M8218B33CEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PT7M8218B33CEX

Manufacturer:: Diodes Incorporated

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

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: PT7M8218B33CEX.pdf

Description:: IC REG LINEAR 3.3V 300MA SC70-5

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PT7M8218B33CEX from Pericom Semiconductor is a 3.3V, 300mA low-dropout linear regulator with ±2% output accuracy, 75dB PSRR at 1kHz, 150mV dropout at 150mA, 36µA quiescent current, and stable operation with 0.47µF ceramic output capacitors. It serves as a precision power supply for noise-sensitive RF and digital baseband circuits in portable wireless devices.

For engineers reviewing the PT7M8218B33CEX datasheet, PT7M8218B33CEX pinout, PT7M8218B33CEX application, or PT7M8218B33CEX equivalent, key selection criteria include guaranteed 300mA load capability under 1.7–5.5V input, auto output discharge, thermal shutdown at 170°C, and SC70-5L package compatibility with space-constrained mobile designs.

Technical Context

The PT7M8218B33CEX uses a P-channel MOSFET pass element controlled by an internal error amplifier and reference voltage source, enabling low dropout and high PSRR without external compensation. Its integrated phase compensator ensures stability with 0.47µF X5R/X7R ceramic capacitors on both input and output.

Enable control is active-high (VENH ≥1.2V), with standby current ≤1µA when EN = GND. Protection includes foldback current limiting (400mA typical), short-circuit current limit (40mA), and thermal shutdown with 20°C hysteresis to prevent cycling under overload.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.3V ±2% initial accuracy - ensures reliable logic-level compliance for 3.3V I/O domains.
Max Output Current	300mA - supports sustained operation of RF transceivers, camera ISPs, and baseband processors.
Dropout Voltage	150mV @ 150mA - enables regulation from 3.45V input, critical for single-cell Li-ion (3.0–4.2V) systems.
PSRR	75dB @ 1kHz - suppresses switching noise from DC/DC converters feeding adjacent analog/RF blocks.
Quiescent Current	36µA - minimizes battery drain during standby in always-on sensor or connectivity modules.
Operating Temp	−40°C to +85°C - qualified for consumer handheld and industrial portable equipment environments.
Output Capacitor	0.47µF ceramic (X5R/X7R) - eliminates need for bulky tantalum or aluminum electrolytics, reducing board area and cost.

Pinout & Package

PT7M8218B33CEX is packaged in SC70-5L (JEDEC MO-203B/AA), a 2.2mm × 1.35mm × 0.9mm surface-mount package with 0.65mm pitch, optimized for ultra-compact portable PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 - VIN	Input supply rail	Accepts 1.7–5.5V; requires local 0.47µF ceramic bypass to GND for EMI suppression and transient response.
2 - GND	Power ground reference	Low-impedance return path for regulator core and output current; must be connected directly to PCB ground plane.
3 - EN	Active-high enable control	Drives internal P-MOS gate; logic-high (≥1.2V) enables regulation; floating state increases leakage current.
4 - NC	No-connect terminal	Internally unconnected; recommended to tie to GND for mechanical stability and EMI reduction.
5 - VOUT	Regulated output	Delivers 3.3V ±2%; requires 0.47µF ceramic capacitor to GND within 2mm for stability and load transient performance.

Key Features

Feature	Design Value
Auto output discharge	Internal 50Ω discharge path activates when EN = low, ensuring rapid VOUT decay to prevent latch-up in multi-rail sequencing.
Thermal shutdown protection	Turns off output at 170°C junction temperature with 20°C hysteresis, preventing permanent damage during sustained overload or poor heatsinking.
Low-noise operation	60µV_RMS output noise (10Hz–100kHz) - preserves SNR in audio codecs, ADC references, and RF synthesizer VCO supplies.
High accuracy over temperature	±100ppm/°C output drift - maintains <±3% total variation across −40°C to +85°C, eliminating need for system-level calibration.
Stable with low-ESR caps	Guaranteed stability with 0.47µF X5R/X7R ceramics - avoids costly external compensation networks and simplifies layout.

Applications

Cellular Baseband Power

RF Front-End Biasing

Use Scenario: Powers ARM9/ARM11 application processors and memory interfaces in GSM/CDMA/IMT2000 handsets operating from single Li-ion cells.

IC Role / Device Role / Timing Role: Primary 3.3V LDO for digital baseband subsystem, delivering clean, sequenced power with fast EN-controlled turn-on/turn-off.

Use Value: 36µA quiescent current extends standby time; 150mV dropout enables full 300mA delivery down to 3.45V input, maximizing battery utilization.

Use Scenario: Supplies bias voltage to PA drivers, LNAs, and mixer ICs in quad-band cellular front-ends.

IC Role / Device Role / Timing Role: Low-noise, high-PSRR post-regulator for RF signal chain components requiring minimal supply-induced phase noise.

Use Value: 75dB PSRR at 1kHz rejects noise from nearby DC/DC converters; 60µV_RMS noise prevents degradation of receiver sensitivity and EVM.

Digital Camera ISP Core

Portable Audio Codec Supply

Use Scenario: Provides regulated 3.3V to image signal processors (ISPs) and CMOS image sensors in DSCs and camcorders.

IC Role / Device Role / Timing Role: Main power rail for ISP logic and interface circuitry, synchronized via EN pin to camera power-up sequence.

Use Value: Auto output discharge prevents back-powering of sensor I/O during shutdown; ±2% accuracy ensures consistent ADC reference scaling.

Use Scenario: Powers stereo audio codecs and headphone amplifiers in MP3 players and Bluetooth headsets.

IC Role / Device Role / Timing Role: Clean analog supply rail decoupled from noisy digital domains, supporting low-THD audio playback.

Use Value: 0.47µF ceramic stability allows compact 2-layer PCB design; thermal shutdown protects against overheating during extended headphone drive.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6206P332MR	300mA max, 250mV dropout @ 150mA, 65dB PSRR @ 1kHz, no EN pin	Lacks enable control and auto-discharge; requires external shutdown circuitry	Select when EN functionality is unnecessary and lower PSRR is acceptable for non-RF loads
Richtek RT9193-33GB	300mA max, 200mV dropout @ 150mA, 70dB PSRR @ 1kHz, 50µA IQ	Higher quiescent current and lower PSRR; SC70-5L compatible but no auto-discharge	Choose for cost-sensitive designs where 14µA higher IQ and 5dB PSRR loss are tolerable

Compared with XC6206P332MR and RT9193-33GB, PT7M8218B33CEX uniquely combines EN control, auto-discharge, 75dB PSRR, and 36µA IQ in SC70-5L - making it optimal for RF-critical, battery-constrained mobile applications requiring precise power sequencing and noise immunity.

Availability

PT7M8218B33CEX is available at Aetrix Electronics and suitable for cellular baseband power, RF front-end biasing, digital camera ISP core, and portable audio codec supply requiring stable component supply, long-term lifecycle support, and traceable green packaging.

Supply support for PT7M8218B33CEX 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 timing, interface, and power management ICs for communications and computing markets before its 2016 acquisition.

The PT7M8218 belongs to Pericom's precision LDO family designed specifically for battery-powered portable electronics demanding ultra-low IQ, high PSRR, and small-footprint packaging.

FAQ

What is the minimum input voltage required for stable 3.3V output at 300mA?

The PT7M8218B33CEX requires a minimum input voltage of 3.45V to maintain 3.3V output at 300mA load, based on its 150mV dropout specification at 150mA and confirmed derating to ~180mV at full 300mA per datasheet curves. Below this, output voltage collapses due to insufficient headroom.

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

Yes, Pin 4 (NC) may be left floating per datasheet guidance, but Pericom recommends connecting it to GND to improve mechanical anchoring and reduce potential EMI coupling into the SC70-5L package. No electrical function is affected either way.

Does PT7M8218B33CEX require an input capacitor?

Yes - a 0.47µF X5R/X7R ceramic capacitor is required between VIN and GND, placed within 2mm of the pins. This stabilizes the internal control loop during line transients and prevents oscillation, as confirmed by functional testing in the datasheet's application circuits.

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

When EN is pulled low, an internal 50Ω switch connects VOUT to GND, discharging the output capacitor in ~1.5ms for a typical 4.7µF load. This prevents back-powering of upstream circuitry and ensures safe, predictable power-down sequencing in multi-rail systems.

PT7M8218B33CEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 5-TSSOP, SC-70-5, SOT-353

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.15V @ 150mA (Typ)

Current - Output:: 300mA

Current - Quiescent (Iq):: 50 µA

Current - Supply (Max):: -

PSRR:: 75dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-70-5

PT7M8218B33CEX FAQ

1.How can I place an order for PT7M8218B33CEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PT7M8218B33CEX 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 PT7M8218B33CEX reliable?

The price and inventory of PT7M8218B33CEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M8218B33CEX is usually 5 days.

3.What payment methods are accepted for PT7M8218B33CEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M8218B33CEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PT7M8218B33CEX?

PT7M8218B33CEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PT7M8218B33CEX 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 PT7M8218B33CEX?

For technical support, including PT7M8218B33CEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M8218B33CEX requirements.

6.How does Aetrix verify that PT7M8218B33CEX is sourced from the original manufacturer or authorized distributors?

All PT7M8218B33CEX 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 PT7M8218B33CEX meets industry standards.

7.What is the process for return or replacement of PT7M8218B33CEX?

All PT7M8218B33CEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M8218B33CEX, 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 PT7M8218B33CEX part is unused and in its original packaging.

Return procedure for PT7M8218B33CEX:

1.Submit a request within 90 days.

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

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