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

onsemi NCP508SQ28T1G

Name: NCP508SQ28T1G
Brand: onsemi
SKU: NCP508SQ28T1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP508SQ28T1G

Manufacturer:: onsemi

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

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

Datasheet:: NCP508SQ28T1G.pdf

Description:: IC REG LINEAR 2.8V 50MA SC88A

Quantity:: RFQ Add To RFQ list

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Product details

Overview

NCP508SQ28T1G from onsemi is a 50 mA, 2.8 V fixed-output low dropout (LDO) voltage regulator in SC-88A package, featuring 140 mV typical dropout at 30 mA, 70 dB ripple rejection at 1 kHz, and 39 µVrms output noise without bypass capacitor-designed for powering noise-sensitive RF subsystems such as VCOs and PLLs in handheld devices.

For engineers reviewing the NCP508SQ28T1G datasheet, pinout, applications, or equivalent options, this page delivers verified specifications, thermal and transient performance data, SC-88A footprint details, and validated alternative LDOs for RF power rail design.

Technical Context

The NCP508SQ28T1G integrates a PMOS pass transistor, precision voltage reference, error amplifier, and thermal/overcurrent protection-enabling fast 20 µs enable turn-on and stable operation with ceramic capacitors as low as 1.0 µF. Its architecture eliminates need for minimum load current and supports ESR from a few mΩ up to 3 Ω.

Designed specifically for battery-powered RF signal chains, it operates from 2.8 V nominal output across input range of 3.8 V to 7.0 V (max recommended), with tight ±2% output tolerance at 25°C and ±3% over −40°C to +85°C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8 V ±2% at 25°C; ensures stable bias for 2.8 V logic or RF ICs without external feedback
Max Output Current	50 mA continuous; sufficient for low-power VCOs, sensor interfaces, or MCU I/O rails
Dropout Voltage	140 mV typ at 30 mA; enables regulation down to Vin = 2.94 V, extending battery runtime
Ripple Rejection	70 dB at 1 kHz; suppresses switching noise from upstream DC/DC converters in mixed-signal systems
Output Noise	39 µVrms (100 Hz–100 kHz); avoids phase noise degradation in oscillator circuits
Enable Threshold	Logic-compatible: turns on when Enable ≥ 0.9 V; allows direct connection to 1.8 V/3.3 V GPIO
Quiescent Current	0.1 µA typ in shutdown; minimizes standby power in always-on wireless modules

Pinout & Package

SC-88A (SOT-353) 5-pin surface-mount package: 1.25 mm × 1.65 mm footprint, 0.65 mm pitch, Pb-free, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1	Vin	Positive input supply; accepts 2.94 V to 7.0 V; requires local 1.0 µF ceramic decoupling
2	GND	Power ground reference; must connect to low-impedance PCB ground plane
3	Enable	Active-high logic control; pull high to Vin for operation, low for <0.1 µA shutdown current
4	N/C	No internal connection; electrically isolated; no routing or soldering required
5	Vout	Regulated 2.8 V output; stable with 1.0 µF ceramic capacitor; supports ESR up to 3 Ω

Key Features

Feature	Design Value
Ultra-low noise regulation	39 µVrms output noise without bypass cap-preserves signal integrity in VCO/PLL bias rails
Fast enable response	20 µs turn-on time from Enable assertion to 95% Vout-supports dynamic power gating in portable RF systems
Ceramic capacitor compatibility	Stable with 1.0 µF X7R/X5R MLCCs; eliminates need for tantalum or electrolytic bulk caps
Thermal and current protection	Internal foldback current limit and thermal shutdown at ~125°C-prevents damage during overload or poor heatsinking
Precision output tolerance	±2% at 25°C, ±3% over full temperature range-reduces need for post-regulation trimming in production

Applications

RF Handset Power Management	VCO Bias Supply
Use Scenario: Powering RF transceiver ICs and front-end modules in 4G/5G smartphones where battery voltage sags under transmit load. IC Role / Device Role / Timing Role: Primary LDO delivering clean 2.8 V to PA driver stages and mixer bias networks. Use Value: 70 dB ripple rejection prevents DC/DC switching noise from modulating RF carriers; 140 mV dropout extends usable battery range by >150 mV.	Use Scenario: Providing ultra-low-noise bias to voltage-controlled oscillators in frequency synthesizers. IC Role / Device Role / Timing Role: Low-noise linear regulator supplying VCO core and tuning diode bias rails. Use Value: 39 µVrms noise avoids phase jitter increase; ±2% output tolerance maintains precise center frequency accuracy.
PLL Reference Clock Conditioning	Low-Power Sensor Interface
Use Scenario: Regulating power to PLL charge pump and loop filter components in baseband processors. IC Role / Device Role / Timing Role: Dedicated LDO isolating PLL analog supply from noisy digital domains. Use Value: Fast 20 µs enable allows synchronized power-up with clock tree initialization; thermal protection prevents lock loss during sustained high-current events.	Use Scenario: Supplying 2.8 V to MEMS accelerometers, environmental sensors, or ADC reference buffers in wearables. IC Role / Device Role / Timing Role: Standby-optimized LDO enabling sub-µA sleep mode while maintaining regulated rail. Use Value: 0.1 µA quiescent current in shutdown extends battery life in intermittent-sampling applications; SC-88A footprint saves board space.

RF Handset Power Management

VCO Bias Supply

Use Scenario: Powering RF transceiver ICs and front-end modules in 4G/5G smartphones where battery voltage sags under transmit load.

IC Role / Device Role / Timing Role: Primary LDO delivering clean 2.8 V to PA driver stages and mixer bias networks.

Use Value: 70 dB ripple rejection prevents DC/DC switching noise from modulating RF carriers; 140 mV dropout extends usable battery range by >150 mV.

Use Scenario: Providing ultra-low-noise bias to voltage-controlled oscillators in frequency synthesizers.

IC Role / Device Role / Timing Role: Low-noise linear regulator supplying VCO core and tuning diode bias rails.

Use Value: 39 µVrms noise avoids phase jitter increase; ±2% output tolerance maintains precise center frequency accuracy.

PLL Reference Clock Conditioning

Low-Power Sensor Interface

Use Scenario: Regulating power to PLL charge pump and loop filter components in baseband processors.

IC Role / Device Role / Timing Role: Dedicated LDO isolating PLL analog supply from noisy digital domains.

Use Value: Fast 20 µs enable allows synchronized power-up with clock tree initialization; thermal protection prevents lock loss during sustained high-current events.

Use Scenario: Supplying 2.8 V to MEMS accelerometers, environmental sensors, or ADC reference buffers in wearables.

IC Role / Device Role / Timing Role: Standby-optimized LDO enabling sub-µA sleep mode while maintaining regulated rail.

Use Value: 0.1 µA quiescent current in shutdown extends battery life in intermittent-sampling applications; SC-88A footprint saves board space.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-2802E/TT	250 mA output, 170 mV dropout at 250 mA, 65 dB RR at 1 kHz, 30 µVrms noise	Higher current capability but larger SOT-23-3 footprint; less suitable for ultra-low-noise VCO use	Select when higher load current or lower cost is prioritized over RF-grade noise performance
TNIV28M	50 mA output, 200 mV dropout at 30 mA, 60 dB RR at 1 kHz, 45 µVrms noise, SC-88A package	Same footprint and current rating, but higher noise and lower RR-less effective in sensitive RF paths	Acceptable for non-critical analog rails where 2.8 V regulation is needed but phase noise is not constrained

Compared with NCP508SQ28T1G, MCP1700T-2802E/TT offers greater drive strength but sacrifices RF noise performance and package size; TNIV28M matches form factor but trades 6 dB ripple rejection and 6 µVrms noise margin-making NCP508SQ28T1G the optimal choice for VCO/PLL bias where spectral purity is critical.

Availability

NCP508SQ28T1G is available at Aetrix Electronics and suitable for RF handset power management, VCO bias supply, and PLL reference clock conditioning requiring stable component supply across industrial temperature range and long-term production continuity.

Supply support for NCP508SQ28T1G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and communications markets.

The NCP508 series belongs to onsemi's precision low-noise LDO portfolio, engineered specifically for powering noise-sensitive RF and analog circuitry in battery-operated wireless devices.

FAQ

What is the maximum input voltage rating for the NCP508SQ28T1G?

The NCP508SQ28T1G has an absolute maximum input voltage of 13.0 V, but its recommended operating input voltage is limited to 7.0 V per datasheet specifications. Operating above 7.0 V may compromise thermal performance and long-term reliability, especially at elevated ambient temperatures. The NCP508SQ28T1G is optimized for battery-input applications where Vin typically ranges from 2.94 V (dropout condition) to 7.0 V.

Does the NCP508SQ28T1G require an external bypass capacitor to achieve its specified 39 µVrms noise performance?

No, the NCP508SQ28T1G achieves 39 µVrms output noise (100 Hz–100 kHz) without any external bypass capacitor-this value is measured and guaranteed per the datasheet under standard test conditions (Vout = 1.5 V, Iout = 40 mA). For the NCP508SQ28T1G specifically, the same ultra-low-noise behavior applies due to identical internal architecture and process; adding a bypass cap does not further reduce noise but may improve PSRR at higher frequencies.

Can the NCP508SQ28T1G be used with ceramic output capacitors below 1.0 µF?

No-the NCP508SQ28T1G requires a minimum 1.0 µF ceramic output capacitor for stability, as confirmed in the Applications Information section of the datasheet. Using smaller values risks oscillation or degraded transient response. The device supports ceramic capacitors with ESR from a few mΩ up to 3 Ω, making it compatible with common X5R/X7R MLCCs, but capacitance must meet or exceed 1.0 µF.

What is the thermal resistance (R_JA) of the NCP508SQ28T1G in its SC-88A package?

The NCP508SQ28T1G in SC-88A package has a thermal resistance R_JA of 200 °C/W when mounted on a 30 mm × 30 mm PCB with 1 oz copper, per datasheet Note 4. This value assumes standard JEDEC test conditions; actual R_JA improves with added copper pour or thermal vias. The NCP508SQ28T1G's internal thermal shutdown activates at ~125°C junction temperature, providing robust protection under sustained overload.

Is the NCP508SQ28T1G still in active production or marked as discontinued?

The NCP508SQ28T1G is marked as discontinued per the official onsemi datasheet revision 6 (January 2026), which explicitly lists it in the "DISCONTINUED" table on page 13. However, Aetrix Electronics maintains legacy inventory and provides lifecycle availability coordination-including last-time-buy planning and cross-reference support-for customers transitioning from the NCP508SQ28T1G to active alternatives.

NCP508SQ28T1G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

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):: 7V

Voltage - Output (Min/Fixed):: 2.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.18V @ 50mA (Typ)

Current - Output:: 50mA

Current - Quiescent (Iq):: 1 µA

Current - Supply (Max):: 1.9 mA

PSRR:: 70dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-88A (SC-70-5/SOT-353)

NCP508SQ28T1G FAQ

1.How can I place an order for NCP508SQ28T1G through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP508SQ28T1G 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 NCP508SQ28T1G reliable?

The price and inventory of NCP508SQ28T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP508SQ28T1G is usually 5 days.

3.What payment methods are accepted for NCP508SQ28T1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP508SQ28T1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCP508SQ28T1G?

NCP508SQ28T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP508SQ28T1G 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 NCP508SQ28T1G?

For technical support, including NCP508SQ28T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP508SQ28T1G requirements.

6.How does Aetrix verify that NCP508SQ28T1G is sourced from the original manufacturer or authorized distributors?

All NCP508SQ28T1G 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 NCP508SQ28T1G meets industry standards.

7.What is the process for return or replacement of NCP508SQ28T1G?

All NCP508SQ28T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP508SQ28T1G, 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 NCP508SQ28T1G part is unused and in its original packaging.

Return procedure for NCP508SQ28T1G:

1.Submit a request within 90 days.

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

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