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onsemi MC33761SNT1-050G
- Part No.:
- MC33761SNT1-050G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MC33761SNT1-050G.pdf
- Description:
- IC REG LINEAR 5V 80MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,407
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Product details
Overview
MC33761SNT1-050G 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 µVRMS noise (100 Hz–100 kHz), and 1.5% output voltage accuracy at 25°C. It serves as a precision power source for RF front-ends and portable burst-mode systems.
For engineers reviewing the MC33761SNT1-050G datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.0 V logic-compatible ON/OFF control, absence of external bypass capacitor requirement, fast 40 µs wake-up time, and thermal shutdown protection - all critical for battery-powered, noise-sensitive designs.
Technical Context
The MC33761SNT1-050G employs a PNP pass transistor architecture with integrated bandgap reference and proprietary load transient improvement circuitry that actively detects output overshoot decay and forces rapid return to regulation - eliminating deep undershoot during burst-mode load reactivation. Its control loop is optimized for stability with 1.0 µF ceramic or tantalum output capacitors across wide ESR ranges (few mΩ to 3.0 Ω).
Unlike conventional LDOs, it achieves 40 µVRMS integrated noise without an external bypass capacitor due to internal noise-suppression design, enabling simultaneous low-noise operation and sub-40 µs startup response. Static line regulation exceeds −75 dB, and ripple rejection is 70 dB at 1.0 kHz, making it suitable for powering VCOs and RF stages directly from noisy intermediate rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±1.5% (25°C), ±3.0% (−40°C to +85°C) - ensures stable bias for analog/RF ICs across temperature. |
| Dropout Voltage | 90 mV @ 30 mA - enables operation with only 5.09 V input for full 5.0 V output, extending battery runtime. |
| Noise Performance | 40 µVRMS (100 Hz–100 kHz), 150 nV/√Hz @ 1.0 kHz - meets stringent spectral purity requirements for VCO supply rails. |
| ON/OFF Control | 900 mV logic-high threshold, 150 mV logic-low - compatible with 1.0 V I/O platforms and low-voltage microcontrollers. |
| Startup Time | 40 µs typical (200 Hz repetitive) - eliminates need for external bypass cap while maintaining ultra-fast wake-up. |
| Ripple Rejection | 70 dB @ 1.0 kHz - suppresses switching noise from upstream DC-DC converters feeding RF subsystems. |
| Thermal Shutdown | Activates at 125°C junction temperature - provides fail-safe protection during overload or poor PCB thermal design. |
Pinout & Package
MC33761SNT1-050G 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 5.0 V to 12 V input; must be decoupled with ≥1.0 µF capacitor near pin for stability and transient response. |
| 2 - GND | Ground reference | IC substrate and feedback reference node; requires low-impedance connection to system ground plane. |
| 3 - ON/OFF | Logic enable control | Active-high digital input; 900 mV min to enable, 150 mV max to disable; internal 250 kΩ pull-down. |
| 4 - NC | No-connect terminal | Not internally bonded; must remain unconnected or tied to GND - no electrical function or routing required. |
| 5 - Vout | Regulated output | Delivers 5.0 V ±1.5%; requires ≥1.0 µF output capacitor (ceramic/tantalum) for stability and noise filtering. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-noise architecture | 40 µVRMS noise without external bypass capacitor - eliminates board area, cost, and reliability risk of added component. |
| Load transient improvement | Proprietary circuit prevents deep undershoot during rapid load reactivation in TDMA/burst systems - maintains RF signal integrity. |
| 1.0 V logic-compatible enable | 900 mV ON threshold - interfaces directly with modern ultra-low-voltage microcontrollers and baseband processors. |
| Fast wake-up response | 40 µs typical startup time - supports aggressive power-gating strategies in portable devices to minimize quiescent current. |
| Wide input voltage range | Up to 12 V input - allows single-LDO use across multiple battery chemistries (Li-ion, Li-Po, 3×AA) and intermediate rails. |
Applications
| RF Transceiver Power Supply | VCO Biasing |
|---|---|
Use Scenario: Powers the RF transceiver IC in a TDMA cellular handset operating in burst transmission mode with 200 Hz wake/sleep cycles. IC Role / Device Role / Timing Role: Low-noise, fast-switching LDO supplying clean 5.0 V to the transceiver's PA driver and mixer stages. Use Value: 40 µs wake-up and load transient improvement prevent output collapse during transmit bursts, preserving EVM and ACLR performance. | Use Scenario: Supplies bias voltage to a voltage-controlled oscillator in a GPS receiver frontend where phase noise directly impacts positioning accuracy. IC Role / Device Role / Timing Role: Ultra-low-noise 5.0 V regulator providing stable reference for VCO tuning port and core bias rails. Use Value: 150 nV/√Hz noise density and −75 dB line regulation suppress supply-induced phase jitter, improving carrier-to-noise ratio by >3 dB. |
| Battery-Powered IoT Sensor Node | Portable Medical Pulse Oximeter |
Use Scenario: Powers a BLE SoC and analog sensor interface in a coin-cell–operated environmental monitor requiring multi-year battery life. IC Role / Device Role / Timing Role: Enable-controlled LDO delivering regulated 5.0 V only during active sensing and radio transmission windows. Use Value: 0.1 µA OFF-state current and 40 µs startup minimize energy loss during sleep/wake transitions, extending operational lifetime by >25%. | Use Scenario: Supplies analog front-end (AFE) and LED drivers in a handheld pulse oximeter where optical signal fidelity depends on supply cleanliness. IC Role / Device Role / Timing Role: Precision 5.0 V LDO powering photodiode amplifiers and red/IR LED current sources. Use Value: 1.5% output accuracy and 40 µVRMS noise ensure consistent LED intensity and minimal ADC baseline drift, improving SpO₂ measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST50T3G | Fixed 5.0 V output, higher 1.2 V dropout, 42 µVRMS noise, requires 10 µF minimum output cap, no 1.0 V enable. | Designed for general-purpose industrial power rails; lacks burst-mode transient optimization and ultra-low-noise capability. | Select when cost and footprint are primary concerns and noise/transient performance are secondary. |
| MCP1703T-5002E/MB | 5.0 V output, 600 mV dropout, 30 µVRMS noise, 1.8 V min enable threshold, SOT-23-5 package. | Optimized for low-quiescent-current always-on applications; slower 100 µs startup and no load transient improvement. | Select for ultra-low-IQ applications where 1.0 V enable and burst-mode recovery are not required. |
Compared with NCP1117ST50T3G and MCP1703T-5002E/MB, the MC33761SNT1-050G uniquely combines 1.0 V logic enable, 40 µs startup, and proprietary load transient recovery - making it the only option among the three qualified for TDMA RF burst systems demanding simultaneous low noise and fast dynamic response.
Availability
MC33761SNT1-050G is available at Aetrix Electronics and suitable for RF transceiver power supplies, VCO biasing, battery-powered IoT sensor nodes, and portable medical pulse oximeters requiring stable component supply with guaranteed long-term availability.
Supply support for MC33761SNT1-050G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC33761SNT1-050G belongs to onsemi's precision analog LDO portfolio, engineered specifically for noise-critical RF and portable burst-mode systems where traditional regulators fail to meet both spectral purity and dynamic response requirements.
FAQ
What is the maximum input voltage rating for MC33761SNT1-050G?
The MC33761SNT1-050G has an absolute maximum input voltage rating of 12 V on the Vin pin (Pin 1), as specified in the Maximum Ratings table of the official datasheet. Operation above this voltage may cause permanent damage. For reliable 5.0 V output, the recommended input range is Vout + 1.0 V (6.0 V) to 12 V, with dropout increasing linearly with load current.
Does MC33761SNT1-050G require an external bypass capacitor for noise reduction?
No, the MC33761SNT1-050G does not require an external bypass capacitor. Its proprietary ultra-low-noise architecture achieves 40 µVRMS (100 Hz–100 kHz) without one - a key differentiator versus conventional LDOs. This eliminates associated board area, cost, and reliability risks while enabling 40 µs startup time.
What is the ON/OFF control voltage threshold for MC33761SNT1-050G?
The MC33761SNT1-050G features a 1.0 V logic-compatible enable input: it turns ON when the ON/OFF pin (Pin 3) voltage reaches ≥900 mV and turns OFF when voltage drops ≤150 mV. The internal ON/OFF input resistance is 250 kΩ, allowing direct drive from low-power microcontrollers without external level-shifting.
Can MC33761SNT1-050G be used with ceramic output capacitors?
Yes, the MC33761SNT1-050G is fully stable with ceramic output capacitors. The datasheet explicitly states it accepts "ceramic chip capacitors as well as tantalum devices" and requires only a minimum 1.0 µF output capacitance - with no ESR constraints - thanks to its internally compensated architecture.
What protection features are integrated into MC33761SNT1-050G?
The MC33761SNT1-050G integrates thermal shutdown (activates at 125°C junction temperature), current limiting (100–500 mA typical trip range), and antisaturation protection. These features prevent catastrophic failure under overload, short-circuit, or high ambient temperature conditions - ensuring robust operation in unattended portable and medical devices.
MC33761SNT1-050G 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
MC33761SNT1-050G FAQ
1.How can I place an order for MC33761SNT1-050G through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33761SNT1-050G 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 MC33761SNT1-050G reliable?
The price and inventory of MC33761SNT1-050G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33761SNT1-050G is usually 5 days.
3.What payment methods are accepted for MC33761SNT1-050G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33761SNT1-050G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33761SNT1-050G?
MC33761SNT1-050G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33761SNT1-050G 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 MC33761SNT1-050G?
For technical support, including MC33761SNT1-050G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33761SNT1-050G requirements.
6.How does Aetrix verify that MC33761SNT1-050G is sourced from the original manufacturer or authorized distributors?
All MC33761SNT1-050G 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 MC33761SNT1-050G meets industry standards.
7.What is the process for return or replacement of MC33761SNT1-050G?
All MC33761SNT1-050G units undergo pre-shipment inspection (PSI). If there is an issue with MC33761SNT1-050G, 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 MC33761SNT1-050G part is unused and in its original packaging.
Return procedure for MC33761SNT1-050G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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