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Diodes Incorporated PT7M8218B33TAEX
- Part No.:
- PT7M8218B33TAEX
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
PT7M8218B33TAEX.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,805
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Product details
Overview
PT7M8218B33TAEX from Pericom Semiconductor is a 3.3V, 300mA low-dropout linear regulator featuring 150mV dropout at 150mA, ±2% initial output accuracy, 75dB PSRR at 1kHz, and stable operation with 0.47µF ceramic output capacitors. It serves as a precision power supply for noise-sensitive analog and RF circuitry in portable wireless devices.
For engineers reviewing the PT7M8218B33TAEX datasheet, PT7M8218B33TAEX pinout, PT7M8218B33TAEX application, or PT7M8218B33TAEX equivalent, key selection criteria include guaranteed 300mA load capability under 1.7–5.5V input, auto output discharge functionality, thermal shutdown at 170°C, and EN pin compatibility with 1.2V logic-high threshold.
Technical Context
The PT7M8218B33TAEX integrates a P-channel MOSFET pass element, internal reference voltage source, error amplifier with phase compensation, and protection circuitry including current limit (400mA typical) and thermal shutdown (170°C with 20°C hysteresis). Its architecture enables stability with ultra-low-ESR 0.47µF X5R/X7R ceramic capacitors on both input and output.
Control is implemented via a high-active EN pin with 0.3V logic-low threshold and sub-0.1µA leakage in both states; standby current is 0.05µA typical. The device maintains ±100ppm/°C output voltage drift over –40°C to +85°C and delivers 60µVRMS output noise (10Hz–100kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% initial accuracy - ensures reliable biasing of 3.3V I/O domains without external trimming. |
| Max Output Current | 300mA guaranteed - supports moderate-power microcontrollers, RF front-ends, and sensor interfaces. |
| Dropout Voltage | 150mV @ 150mA (VOUT=2.8V) - enables regulation from 3.45V input down to 3.3V output, extending battery runtime. |
| PSRR | 75dB @ 1kHz - suppresses switching noise from upstream DC/DC converters in mixed-signal systems. |
| Quiescent Current | 36µA typical - minimizes no-load power loss in always-on subsystems like real-time clocks or wake-up circuits. |
| Operating Temp | –40°C to +85°C - qualified for consumer and industrial portable equipment environments. |
| Capacitor Support | Stable with 0.47µF ceramic (X5R/X7R) - eliminates need for bulk electrolytic capacitors, reducing board area and cost. |
Pinout & Package
PT7M8218B33TAEX is packaged in lead-free, RoHS-compliant SOT23-5L (JEDEC MO-178C/AA) - a 2.9mm × 1.6mm surface-mount package with 0.95mm pitch, optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power Input | Regulator input supply (1.7–5.5V); requires local 0.47µF ceramic bypass to GND for stability. |
| 2 - GND | Ground Reference | Analog and power ground return; must be low-impedance connection to minimize noise coupling. |
| 3 - EN | Enable Control | High-active logic input (1.2V min high, 0.3V max low); drives internal ON/OFF circuitry with <0.1µA leakage. |
| 4 - NC | No Connect | Internally unconnected; recommended to tie to GND for mechanical stability and EMI reduction. |
| 5 - VOUT | Regulated Output | 3.3V regulated output; requires 0.47µF ceramic capacitor to GND within 2mm for transient response and PSRR performance. |
Key Features
| Feature | Design Value |
|---|---|
| Auto Output Discharge | Internal 50Ω discharge path activates when EN = LOW - prevents floating output during power-down sequencing. |
| Low-Noise Regulation | 60µVRMS integrated noise (10Hz–100kHz) - suitable for powering ADC references and RF synthesizers. |
| Thermal Protection | 170°C shutdown with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Precision Output Accuracy | ±2% over line, load, and temperature - eliminates need for post-assembly calibration in cost-sensitive designs. |
| Ultra-Low Quiescent Current | 36µA operating / 0.05µA standby - extends battery life in sleep-mode applications such as Bluetooth LE peripherals. |
Applications
| Mobile Baseband Power | RF Front-End Biasing |
|---|---|
|
Use Scenario: Powering baseband processor I/O banks and memory interfaces in GSM/CDMA handsets. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying digital core logic with fast load transient response. Use Value: 150mV dropout enables operation down to 3.45V battery voltage, preserving usable capacity in Li-ion discharge curve. |
Use Scenario: Providing clean bias to PA drivers and LNA stages in 2G/3G transceivers. IC Role / Device Role / Timing Role: Low-noise, high-PSRR voltage source isolating RF circuitry from noisy system rails. Use Value: 75dB PSRR at 1kHz suppresses switching artifacts from PMIC DC/DC converters, improving EVM and receiver sensitivity. |
| Digital Camera Sensor Core | Portable Audio Codec Supply |
|
Use Scenario: Regulating power to CMOS image sensor analog front-end and ADC reference in DSCs. IC Role / Device Role / Timing Role: Precision 3.3V rail with ±2% tolerance ensuring consistent pixel response and dynamic range. Use Value: 60µVRMS output noise directly limits sensor readout SNR, enabling higher ISO performance. |
Use Scenario: Supplying 3.3V to stereo audio codecs in MP3 players and voice recorders. IC Role / Device Role / Timing Role: Low-quiescent-current LDO maintaining codec functionality during playback and standby. Use Value: 36µA operating current reduces average power draw, extending playback time by >8% versus typical 100µA LDOs. |
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, 250mV dropout @ 100mA; 50µA IQ; no EN pin or auto-discharge. | Lacks enable control and output discharge - unsuitable for sequenced power-down or hot-swap systems. | Select when EN functionality and fast turn-off are not required; lower cost in high-volume consumer designs. |
| Richtek RT9193-33GB | 300mA, 3.3V, 200mV dropout @ 150mA; 65µA IQ; EN pin but no auto-discharge; 65dB PSRR @ 1kHz. | Lower PSRR and no output discharge - may require additional filtering for RF-sensitive loads. | Prefer where higher PSRR is non-critical and board space allows optional external discharge resistor. |
Compared with XC6206P332MR and RT9193-33GB, PT7M8218B33TAEX uniquely combines EN control, auto-discharge, 75dB PSRR, and 150mV dropout - making it optimal for compact, multi-rail portable systems requiring robust power sequencing and noise immunity.
Availability
PT7M8218B33TAEX is available at Aetrix Electronics and suitable for mobile communications, portable imaging, and battery-powered audio applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for PT7M8218B33TAEX 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 computing markets before its 2016 acquisition.
PT7M8218 belongs to Pericom's precision LDO family designed specifically for noise-sensitive, battery-constrained portable electronics - emphasizing low dropout, ultra-low IQ, and ceramic-capacitor compatibility.
FAQ
What is the minimum input voltage required for regulation at 3.3V output?
The PT7M8218B33TAEX requires a minimum input voltage of 3.45V to maintain regulation at full 300mA load, based on its 150mV dropout specification at 150mA and confirmed 180mV worst-case dropout for 3.3V output. At lighter loads (<30mA), regulation is maintained down to 1.7V input.
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 is recommended to improve mechanical reliability during reflow and reduce potential EMI coupling through parasitic antenna effects in high-frequency layouts.
Does PT7M8218B33TAEX 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 and prevents oscillation under dynamic load conditions, as verified in the application circuit and transient response test data.
How does the auto output discharge function operate during shutdown?
When EN is pulled low, an internal 50Ω switch connects VOUT to GND, discharging the output capacitor within ~1.5ms for a 10µF load. This prevents residual voltage from interfering with downstream logic states or causing latch-up during power sequencing, as characterized in Figure 8 and 9 of the datasheet.
PT7M8218B33TAEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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:
- SOT-23-5
PT7M8218B33TAEX FAQ
1.How can I place an order for PT7M8218B33TAEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PT7M8218B33TAEX 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 PT7M8218B33TAEX reliable?
The price and inventory of PT7M8218B33TAEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7M8218B33TAEX is usually 5 days.
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Once your PT7M8218B33TAEX 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 PT7M8218B33TAEX?
For technical support, including PT7M8218B33TAEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7M8218B33TAEX requirements.
6.How does Aetrix verify that PT7M8218B33TAEX is sourced from the original manufacturer or authorized distributors?
All PT7M8218B33TAEX 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 PT7M8218B33TAEX meets industry standards.
7.What is the process for return or replacement of PT7M8218B33TAEX?
All PT7M8218B33TAEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7M8218B33TAEX, 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 PT7M8218B33TAEX part is unused and in its original packaging.
Return procedure for PT7M8218B33TAEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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