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

Diodes Incorporated PT7M8218B33CE

Name: PT7M8218B33CE
Brand: Diodes Incorporated
SKU: PT7M8218B33CE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PT7M8218B33CE

Manufacturer:: Diodes Incorporated

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

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

Datasheet:: PT7M8218B33CE.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:2,833

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Product details

Overview

PT7M8218B33CE 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 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 - deployed in mobile RF front-ends and portable imaging modules.

For engineers reviewing the PT7M8218B33CE datasheet, PT7M8218B33CE pinout, PT7M8218B33CE application, or PT7M8218B33CE equivalent, key selection criteria include dropout voltage under load, PSRR performance at baseband frequencies, EN pin logic polarity (high-active), SC70-5L/SOT23-5L package thermal resistance, and output stability with low-ESR ceramics.

Technical Context

The PT7M8218B33CE uses a P-channel MOSFET pass element controlled by an internal error amplifier with integrated phase compensation, enabling stable regulation with 0.47µF X5R/X7R ceramic capacitors on both input and output. Its reference voltage circuit and feedback loop maintain tight output accuracy across temperature and line/load variations.

EN pin control is high-active with V_ENH ≥ 1.2V and V_ENL ≤ 0.3V; when disabled, the device engages auto-discharge via a 50Ω internal path from VOUT to GND. Protection includes foldback current limiting (400mA typical trip) and thermal shutdown at 170°C with 20°C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3V ±2% initial accuracy ensures stable power for 3.3V I/O domains without external resistors.
Max Output Current	300mA guaranteed delivery supports baseband processors and camera sensor interfaces in compact portable designs.
Dropout Voltage	150mV @ 150mA (V_OUT=2.8V) enables operation down to 3.45V input for 3.3V rail - critical for single-cell Li-ion systems.
PSRR	75dB @ 1kHz suppresses switching noise from adjacent DC/DC converters in RF-sensitive signal chains.
Quiescent Current	36µA typical no-load supply current extends battery life in always-on sensor or standby subsystems.
Operating Temp	–40°C to +85°C ambient range validates use in consumer handhelds and industrial edge devices.
Capacitor Support	Stable with 0.47µF ceramic output capacitor (X5R/X7R) - reduces BOM count and PCB area vs. tantalum alternatives.

Pinout & Package

PT7M8218B33CE is available in SC70-5L (JEDEC MO-203B/AA) and SOT23-5L (JEDEC MO-178C/AA) packages - both 5-pin surface-mount outlines with identical pin mapping and thermal pad-free construction.

Pin/Terminal	Circuit Role	Design Meaning
1 - VIN	Input supply rail	Accepts 1.7V–5.5V; requires 0.47µF ceramic bypass to GND within 2mm trace length for stability.
2 - GND	Analog/digital ground reference	Common return for VIN, VOUT, and EN; must be low-impedance plane to minimize noise coupling.
3 - EN	Enable control input	High-active logic: ≥1.2V enables regulation; ≤0.3V disables output and activates auto-discharge path.
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 with minimal ESL for transient response.

Key Features

Feature	Design Value
Low-noise LDO architecture	60µV_RMS output noise (10Hz–100kHz) preserves SNR in analog audio and image sensor power rails.
Auto output discharge	50Ω internal discharge path pulls VOUT to GND within 100µs after EN deactivation - prevents floating outputs.
Thermal shutdown with hysteresis	170°C trip point + 20°C hysteresis avoids oscillation during sustained overload in confined enclosures.
High-accuracy factory trimming	±2% initial VOUT tolerance over full temperature range eliminates need for post-production calibration.
Low-ESR capacitor compatibility	Stable with 0.47µF X5R/X7R ceramics - enables smaller footprint and lower cost than polymer/tantalum solutions.

Applications

Mobile RF Front-End

Digital Still Camera Sensor Power

Use Scenario: Powering PA bias and RF transceiver LNA stages in GSM/CDMA handsets where switching noise must be suppressed.

IC Role / Device Role / Timing Role: Low-noise, high-PSRR voltage source delivering clean 3.3V to analog RF blocks.

Use Value: 75dB PSRR at 1kHz prevents DC/DC ripple from modulating RF carrier signals and degrading EVM.

Use Scenario: Supplying image sensor core and ADC reference rails in compact DSCs requiring fast turn-on/turn-off sequencing.

IC Role / Device Role / Timing Role: Enable-controlled 3.3V regulator synchronized with sensor frame capture timing.

Use Value: Auto-discharge (50Ω path) clears VOUT within 100µs after EN deassertion - enables precise power gating between frames.

Portable Audio Codec Bias

PDA Application Processor I/O Rail

Use Scenario: Providing low-noise bias for headphone amplifiers and DAC output stages in MP3 players.

IC Role / Device Role / Timing Role: Ultra-low-quiescent-current (36µA) LDO powering analog signal chain components.

Use Value: 60µV_RMS integrated noise avoids audible hiss in high-gain audio paths without additional filtering.

Use Scenario: Delivering stable 3.3V to application processor I/O banks in PDAs with dynamic voltage scaling requirements.

IC Role / Device Role / Timing Role: High-accuracy (±2%) LDO supporting GPIO, UART, and SDIO interface voltage compliance.

Use Value: Tight output tolerance ensures reliable logic-level margin across –40°C to +85°C operating range.

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, 3.3V, 1.8V–6.0V input, 250mV dropout @ 100mA, no EN pin, 50µA IQ	Lacks enable control and auto-discharge - unsuitable for sequenced power-down in multi-rail systems.	Select when EN functionality is unnecessary and board space permits larger dropout margin.
Richtek RT9193-33GB	300mA, 3.3V, 2.0V–6.0V input, 200mV dropout @ 150mA, high-active EN, 60µA IQ	Higher quiescent current and lower PSRR (65dB @ 1kHz) - compromises noise-sensitive analog rails.	Prefer when wider input range (2.0V min) is required and PSRR >70dB is not mandatory.

Compared with XC6206P332MR and RT9193-33GB, PT7M8218B33CE uniquely combines high PSRR (75dB), ultra-low IQ (36µA), and auto-discharge in a sub-1mm SC70-5L package - making it optimal for space-constrained, noise-critical, and battery-sensitive portable designs.

Availability

PT7M8218B33CE is available at Aetrix Electronics and suitable for mobile RF front-ends, digital still camera sensor power, and portable audio codec bias requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for PT7M8218B33CE 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 and consumer electronics before its 2016 acquisition.

The PT7M8218 series was designed specifically for battery-powered portable devices demanding low noise, high PSRR, and minimal quiescent current in ultra-small packages - targeting mobile phone, PDA, and digital imaging markets.

FAQ

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

The PT7M8218B33CE requires VIN ≥ VOUT + V_DROP. At 300mA, dropout rises to ~220mV (extrapolated from 150mV @ 150mA and typical curve data); thus minimum VIN is 3.52V. For guaranteed 300mA delivery, use VIN ≥ 3.6V per datasheet derating guidelines.

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

Yes - Pin 4 is internally unconnected and may be left floating per datasheet guidance. However, tying it to GND improves mechanical anchoring and reduces potential EMI coupling; it is recommended for production layouts but not electrically required.

Does PT7M8218B33CE support ceramic capacitors smaller than 0.47µF?

No - the device is characterized and stabilized only with ≥0.47µF X5R/X7R ceramic output capacitors. Using smaller values risks instability and overshoot during load transients, as confirmed by phase margin measurements in the datasheet's typical performance section.

How does the auto-discharge function behave during thermal shutdown?

Auto-discharge remains active during thermal shutdown: when junction temperature exceeds 170°C, the regulator disables output but maintains the 50Ω discharge path from VOUT to GND until EN is pulled low or VIN drops below UVLO threshold - ensuring safe rail collapse even under fault conditions.

PT7M8218B33CE Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Bulk

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

PT7M8218B33CE FAQ

1.How can I place an order for PT7M8218B33CE through Aetrix?

Please submit a Request for Quotation (RFQ) for PT7M8218B33CE 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 PT7M8218B33CE reliable?

The price and inventory of PT7M8218B33CE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M8218B33CE is usually 5 days.

3.What payment methods are accepted for PT7M8218B33CE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7M8218B33CE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PT7M8218B33CE?

PT7M8218B33CE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PT7M8218B33CE 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 PT7M8218B33CE?

For technical support, including PT7M8218B33CE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M8218B33CE requirements.

6.How does Aetrix verify that PT7M8218B33CE is sourced from the original manufacturer or authorized distributors?

All PT7M8218B33CE 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 PT7M8218B33CE meets industry standards.

7.What is the process for return or replacement of PT7M8218B33CE?

All PT7M8218B33CE units undergo pre-shipment inspection (PSI). If there is an issue with PT7M8218B33CE, 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 PT7M8218B33CE part is unused and in its original packaging.

Return procedure for PT7M8218B33CE:

1.Submit a request within 90 days.

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

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