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

onsemi MC33761SNT1-050

Name: MC33761SNT1-050
Brand: onsemi
SKU: MC33761SNT1-050
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC33761SNT1-050

Manufacturer:: onsemi

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

Package:: SOT-23-5 Thin, TSOT-23-5

Datasheet:: MC33761SNT1-050.pdf

Description:: IC REG LINEAR 5V 80MA 5TSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MC33761SNT1-050 from onsemi is a 5.0 V ultra-low-noise, low-dropout linear regulator in Thin SOT-23-5 package, delivering up to 80 mA output current with 90 mV dropout at 30 mA, 40 µV_RMS integrated noise (100 Hz–100 kHz), and 70 dB ripple rejection at 1 kHz - designed for RF front-ends and portable burst-mode systems.

For engineers reviewing the MC33761SNT1-050 datasheet, pinout, applications, or equivalent options, key selection criteria include ON/OFF control threshold (900 mV logic high), thermal shutdown at 125°C, ±1.5% output accuracy at 25°C, and stability with 1.0 µF ceramic output capacitor without ESR constraints.

Technical Context

The MC33761SNT1-050 employs a PNP pass transistor architecture with internal bandgap reference and proprietary load transient improvement circuitry that actively detects output overshoot decay and forces rapid return to regulation - eliminating deep undershoot during fast burst load transitions typical in TDMA systems.

Its noise performance stems from an optimized internal error amplifier and bypass-capacitor-free design, achieving 150 nV/√Hz spectral density at 1 kHz and 40 µV_RMS wideband noise without external filtering; line regulation remains better than −75 dB DC, enabling robust operation under noisy supply conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V ±1.5% at 25°C (±3.0% over −40°C to +85°C), enabling precision biasing of RF ICs and ADC references
Dropout Voltage	90 mV @ 30 mA, 160 mV @ 80 mA - supports operation with minimal input–output margin in battery-powered systems
Output Noise	40 µV_RMS (100 Hz–100 kHz), 150 nV/√Hz @ 1 kHz - meets stringent requirements for VCO power rails and low-phase-noise synthesizers
Ripple Rejection	70 dB @ 1 kHz - suppresses switching regulator coupling and supply ripple in mixed-signal PCBs
ON/OFF Threshold	900 mV logic high (ON), 150 mV logic low (OFF) - compatible with 1.0 V I/O platforms and low-voltage microcontrollers
Startup Time	40 µs typical (200 Hz repetitive mode) - enables rapid wake-up in duty-cycled sensor nodes and burst-mode transceivers
Thermal Shutdown	Activates at 125°C junction temperature - provides fail-safe protection during overload or poor heatsinking

Pinout & Package

MC33761SNT1-050 is housed in a Pb-free Thin SOT-23-5 (Case 483) package with 0.95 mm max height, optimized for space-constrained portable designs.

Pin/Terminal	Circuit Role	Design Meaning
1 - Vin	Input power supply	Accepts 1.0 V to 12 V input; must be decoupled with ≥1.0 µF capacitor near pin for stability and transient response
2 - GND	Ground reference	Common return path for input, output, and internal circuitry; requires low-inductance PCB connection
3 - ON/OFF	Enable/disable control	Logic-compatible input: ≥900 mV activates regulator; ≤150 mV disables it with <2.0 µA OFF-state current
4 - NC	No-connect terminal	Internally unconnected; must remain floating - not tied to GND or any potential in pin-to-pin replacement scenarios
5 - Vout	Regulated output	Delivers 5.0 V ±1.5%; requires ≥1.0 µF ceramic or tantalum output capacitor with ESR 0–3 Ω for guaranteed stability

Key Features

Feature	Design Value
Ultra-low noise architecture	Eliminates need for external bypass capacitor while maintaining 40 µV_RMS noise - reduces BOM count and PCB area vs. conventional LDOs
Load transient improvement	Actively recovers from output overshoot decay to prevent deep undershoot during burst loads - critical for TDMA phone PA stages
1.0 V logic-compatible enable	ON threshold at 900 mV allows direct interfacing with 1.0 V FPGA I/O banks or low-power microcontroller GPIOs without level shifters
Stable with wide ESR range	Operates reliably with 1.0 µF ceramic capacitors (ESR ~1 mΩ) or tantalum (ESR ~1–3 Ω) - simplifies capacitor selection and sourcing
Fast startup without delay	40 µs typical rise time from OFF to 90% Vout - enables microsecond-scale power gating in energy-harvesting and IoT edge devices

Applications

RF Transceiver Power Rail	VCO Bias Supply
Use Scenario: Powering the analog front-end of a GSM/GPRS TDMA transceiver operating in 200 Hz burst mode with 10–20 ms active periods. IC Role / Device Role / Timing Role: Low-noise 5.0 V LDO providing clean bias to PA driver and mixer stages during transmit bursts. Use Value: 40 µV_RMS noise and load transient improvement prevent AM-to-PM conversion and phase jitter degradation in RF signal paths.	Use Scenario: Supplying the tuning voltage node of a 2.4 GHz voltage-controlled oscillator in a Bluetooth LE radio. IC Role / Device Role / Timing Role: Ultra-stable 5.0 V reference source with minimal spectral noise contribution to VCO control line. Use Value: 150 nV/√Hz noise density at 1 kHz and −75 dB line regulation suppress spurious sidebands and improve EVM.
Battery-Powered Sensor Node	Portable Medical Instrument
Use Scenario: Power management for a wearable pulse oximeter using intermittent LED drive and low-power ADC sampling. IC Role / Device Role / Timing Role: Enable-controlled 5.0 V rail that powers optical subsystem only during measurement windows. Use Value: 40 µs startup and <2.0 µA OFF-state current extend coin-cell battery life by minimizing quiescent loss between readings.	Use Scenario: Providing regulated 5.0 V to analog signal conditioning circuitry in a handheld ECG monitor with strict EMC limits. IC Role / Device Role / Timing Role: Low-EMI, low-noise power source meeting IEC 60601-1 leakage and conducted emission requirements. Use Value: Ripple rejection >70 dB at 1 kHz and absence of external bypass capacitor reduce radiated emissions from power plane coupling.

RF Transceiver Power Rail

VCO Bias Supply

Use Scenario: Powering the analog front-end of a GSM/GPRS TDMA transceiver operating in 200 Hz burst mode with 10–20 ms active periods.

IC Role / Device Role / Timing Role: Low-noise 5.0 V LDO providing clean bias to PA driver and mixer stages during transmit bursts.

Use Value: 40 µV_RMS noise and load transient improvement prevent AM-to-PM conversion and phase jitter degradation in RF signal paths.

Use Scenario: Supplying the tuning voltage node of a 2.4 GHz voltage-controlled oscillator in a Bluetooth LE radio.

IC Role / Device Role / Timing Role: Ultra-stable 5.0 V reference source with minimal spectral noise contribution to VCO control line.

Use Value: 150 nV/√Hz noise density at 1 kHz and −75 dB line regulation suppress spurious sidebands and improve EVM.

Battery-Powered Sensor Node

Portable Medical Instrument

Use Scenario: Power management for a wearable pulse oximeter using intermittent LED drive and low-power ADC sampling.

IC Role / Device Role / Timing Role: Enable-controlled 5.0 V rail that powers optical subsystem only during measurement windows.

Use Value: 40 µs startup and <2.0 µA OFF-state current extend coin-cell battery life by minimizing quiescent loss between readings.

Use Scenario: Providing regulated 5.0 V to analog signal conditioning circuitry in a handheld ECG monitor with strict EMC limits.

IC Role / Device Role / Timing Role: Low-EMI, low-noise power source meeting IEC 60601-1 leakage and conducted emission requirements.

Use Value: Ripple rejection >70 dB at 1 kHz and absence of external bypass capacitor reduce radiated emissions from power plane coupling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS7A4700RGWR	20 V input, 1 A output, 4.2 µV_RMS noise (10 Hz–100 kHz), SO-8 package, requires external 10 µF ceramic capacitor	Higher current and lower noise, but larger footprint and higher quiescent current (1 mA vs. 180 µA)	Preferred for high-current, ultra-low-noise lab equipment; not suitable for space-constrained portable designs
NCP163AMX500TBG	500 mA output, 12 µV_RMS noise (10 Hz–100 kHz), SOT-23-5, 1.5% accuracy, 150 mV dropout @ 300 mA	Higher output current and lower noise, but slower startup (100 µs) and no load transient improvement feature	Appropriate for general-purpose 5 V rail where burst-mode recovery is not required; lacks MC33761SNT1-050's undershoot suppression

Compared with TPS7A4700RGWR and NCP163AMX500TBG, the MC33761SNT1-050 uniquely combines ultra-fast 40 µs startup, active load transient recovery, and 40 µV_RMS noise in a 5-pin SOT-23 - making it optimal for TDMA burst systems where both timing and spectral purity are critical.

Availability

MC33761SNT1-050 is available at Aetrix Electronics and suitable for RF transceivers, portable medical instruments, battery-powered sensor nodes, and burst-mode communication systems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for MC33761SNT1-050 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 focused on energy-efficient electronics, with leadership in automotive, industrial, cloud, and sensing solutions.

The MC33761SNT1-050 belongs to onsemi's ultra-low-noise LDO family, engineered specifically for noise-sensitive RF and portable burst-mode applications where conventional regulators introduce unacceptable phase noise or transient artifacts.

FAQ

What is the maximum input voltage rating for MC33761SNT1-050?

The MC33761SNT1-050 supports a maximum input voltage of 12 V on the Vin pin, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable 5.0 V output, input should remain within Vout + 1.0 V to 12 V - i.e., 6.0 V to 12 V - with dropout increasing linearly with load current.

Does MC33761SNT1-050 require an external bypass capacitor for noise reduction?

No, the MC33761SNT1-050 does not require an external bypass capacitor. Its proprietary low-noise architecture achieves 40 µV_RMS (100 Hz–100 kHz) and 150 nV/√Hz spectral density without one - unlike most LDOs. Adding a bypass capacitor would degrade startup time and is unnecessary for noise performance.

What output capacitor value and type are recommended for MC33761SNT1-050?

The MC33761SNT1-050 requires a minimum 1.0 µF output capacitor, and is stable with ceramic (ESR ~1 mΩ) or tantalum (ESR up to 3 Ω) types. Unlike many LDOs, it imposes no minimum ESR constraint, simplifying capacitor selection and improving reliability across temperature and aging.

How does the load transient improvement feature of MC33761SNT1-050 work?

The MC33761SNT1-050 monitors output voltage decay after load removal and actively forces rapid return to regulation - preventing deep undershoot when a new burst load occurs during the decay phase. This eliminates the "asleep" state seen in standard LDOs and ensures consistent response in TDMA and pulsed RF systems.

Is MC33761SNT1-050 pin-compatible with other variants in the MC33761 family?

Yes, all MC33761 variants including MC33761SNT1-050 share identical Thin SOT-23-5 pinout and footprint. The only differences are output voltage (2.8 V, 2.9 V, 3.0 V, 5.0 V) and laser-trimmed bandgap calibration - allowing drop-in replacement across voltages with no PCB changes.

MC33761SNT1-050 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SOT-23-5 Thin, TSOT-23-5

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 12V

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.25V @ 80mA

Current - Output:: 80mA

Current - Quiescent (Iq):: 180 µA

Current - Supply (Max):: -

PSRR:: 70dB (1kHz)

Control Features:: Enable

Protection Features:: Antisaturation, Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 5-TSOP

MC33761SNT1-050 FAQ

1.How can I place an order for MC33761SNT1-050 through Aetrix?

Please submit a Request for Quotation (RFQ) for MC33761SNT1-050 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 MC33761SNT1-050 reliable?

The price and inventory of MC33761SNT1-050 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33761SNT1-050 is usually 5 days.

3.What payment methods are accepted for MC33761SNT1-050?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33761SNT1-050 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC33761SNT1-050?

MC33761SNT1-050 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC33761SNT1-050 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 MC33761SNT1-050?

For technical support, including MC33761SNT1-050 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33761SNT1-050 requirements.

6.How does Aetrix verify that MC33761SNT1-050 is sourced from the original manufacturer or authorized distributors?

All MC33761SNT1-050 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 MC33761SNT1-050 meets industry standards.

7.What is the process for return or replacement of MC33761SNT1-050?

All MC33761SNT1-050 units undergo pre-shipment inspection (PSI). If there is an issue with MC33761SNT1-050, 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 MC33761SNT1-050 part is unused and in its original packaging.

Return procedure for MC33761SNT1-050:

1.Submit a request within 90 days.

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

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