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onsemi MC33761SNT1-029G
- Part No.:
- MC33761SNT1-029G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MC33761SNT1-029G.pdf
- Description:
- IC REG LINEAR 2.9V 80MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,425
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Product details
Overview
MC33761SNT1-029G from onsemi is a 2.9 V, 80 mA ultra-low-noise LDO regulator in Thin SOT-23-5 package, featuring 40 µVRMS (100 Hz–100 kHz) output noise, 90 mV dropout at 30 mA, and 1.5% output voltage accuracy at 25°C - designed for RF front-ends and portable burst-mode systems.
For engineers reviewing the MC33761SNT1-029G datasheet, pinout, applications, or equivalent options, key selection criteria include low-noise performance without external bypass capacitor, 1.0 V logic-compatible ON/OFF control, fast 40 µs wake-up response, and thermal shutdown protection in space-constrained battery-powered designs.
Technical Context
The MC33761SNT1-029G employs a proprietary PNP pass transistor architecture with integrated load transient improvement circuitry to suppress undershoot during rapid current bursts - critical for TDMA-based RF stages. Its bandgap reference operates without external capacitor, enabling stable 40 µs startup and eliminating ESR dependency on output capacitance.
Static line regulation exceeds −75 dB, and ripple rejection is −70 dB at 1 kHz, ensuring robust immunity against noisy input rails. The device achieves 150 nV/√Hz noise density at 100 Hz while maintaining 1.5% output precision across −40°C to +85°C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.9 V ±1.5% at 25°C; ±3.0% over full temperature/load range - ensures stable biasing for VCOs and low-voltage analog circuits. |
| Ultra-Low Noise | 40 µVRMS (100 Hz–100 kHz), 150 nV/√Hz @ 100 Hz - eliminates need for external bypass capacitor in noise-sensitive RF supply rails. |
| Dropout Voltage | 90 mV @ 30 mA, 160 mV @ 80 mA - enables operation from single-cell Li-ion (3.0 V min) while sustaining full rated output current. |
| ON/OFF Control | 900 mV logic-high threshold, 150 mV logic-low threshold - directly compatible with 1.0 V I/O platforms without level-shifting. |
| Startup Time | 40 µs typical (200 Hz repetitive mode) - supports high-duty-cycle burst applications like GSM/TDMA transceivers. |
| Ripple Rejection | −70 dB @ 1 kHz - attenuates switching regulator coupling and power rail noise before sensitive analog stages. |
| Thermal Shutdown | Activates at 125°C junction temperature - protects against sustained overload or poor PCB thermal design in sealed enclosures. |
Pinout & Package
MC33761SNT1-029G is housed in a Pb-free Thin SOT-23-5 (Case 483) package with 0.95 mm profile, optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Input power supply | Accepts 2.9 V + 1.0 V ≤ Vin ≤ 12 V; supports wide-input battery and post-regulation use cases. |
| 2 - GND | Ground reference | Common return path for internal bias, error amplifier, and pass transistor - must be low-impedance connection to system ground plane. |
| 3 - ON/OFF | Logic enable control | CMOS-compatible input; 900 mV high enables regulation, 150 mV low disables output and reduces quiescent current to 0.1 µA. |
| 4 - NC | No-connect terminal | Internally unconnected; must remain floating - no PCB trace or pull-up/down required for pin-to-pin compatibility. |
| 5 - Vout | Regulated output | Delivers 2.9 V ±1.5%; requires ≥1.0 µF ceramic or tantalum output capacitor for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Load Transient Improvement Architecture | Actively detects output overshoot decay and forces rapid return to steady-state - prevents deep undershoot during consecutive burst loads in TDMA systems. |
| No External Bypass Capacitor Required | Integrated noise suppression enables 40 µVRMS performance without added component count or board area - simplifies layout and reduces BOM cost. |
| Fast Wake-Up Response | 40 µs typical startup time (200 Hz repetitive) - meets tight timing windows in time-division duplexed RF transceivers. |
| 1.0 V Logic-Compatible Enable | 900 mV ON threshold aligns with modern ultra-low-voltage microcontrollers and baseband processors - eliminates level-shifter ICs. |
| Thermal & Current Protection | Internal 125°C thermal shutdown and 100–180 mA current limit - provides fault resilience without external sensing components. |
Applications
| RF VCO Power Supply | TDMA Mobile Transceiver Core |
|---|---|
|
Use Scenario: Providing clean bias voltage to voltage-controlled oscillators in cellular front-end modules. IC Role / Device Role / Timing Role: Ultra-low-noise LDO delivering stable 2.9 V supply independent of noisy switching regulators. Use Value: 40 µVRMS noise floor minimizes phase jitter and preserves EVM in 4G/LTE transmit paths. |
Use Scenario: Powering baseband processor cores in GSM/GPRS handsets operating in time-division burst mode. IC Role / Device Role / Timing Role: Fast-switching LDO enabling synchronous ON/OFF cycling aligned with TDMA frame timing. Use Value: 40 µs wake-up and load transient improvement prevent voltage droop during 577 µs transmit slots. |
| Portable Medical Sensor Node | Low-Power IoT Edge Processor |
|
Use Scenario: Supplying analog signal chain (ADC, op-amps) in battery-powered wearable ECG monitors. IC Role / Device Role / Timing Role: Precision LDO with 1.5% output accuracy and thermal shutdown for safety-critical health monitoring. Use Value: 0.1 µA OFF-state current extends coin-cell battery life; 2.9 V output matches low-voltage sensor IC requirements. |
Use Scenario: Regulating power to ARM Cortex-M0+ microcontrollers in NB-IoT endpoint devices. IC Role / Device Role / Timing Role: Enable-controlled LDO supporting deep-sleep wake-on-interrupt operation with minimal leakage. Use Value: 1.0 V logic-compatible ON/OFF interface integrates directly with MCU GPIO; 90 mV dropout maximizes usable battery voltage range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP114AMX29TBG | 2.9 V, 150 mA, 120 µVRMS noise, 160 mV dropout @ 150 mA, SOT-23-5 | Higher output current but higher noise and slower 100 µs startup - suitable where load current exceeds 80 mA but RF sensitivity is lower. | Select when peak load > 80 mA and 40 µs startup is not required; verify noise impact on downstream analog stages. |
| TPS7A2029PDQNR | 2.9 V, 300 mA, 12 µVRMS noise, 170 mV dropout @ 300 mA, X2SON-4 | Lower noise and higher current, but requires 1.8 V minimum ON/OFF voltage and uses 4-pin package - no NC pin or direct pinout match. | Choose for ultra-low-noise priority and higher current; redesign PCB layout due to different pin count, footprint, and enable voltage. |
Compared with NCP114AMX29TBG and TPS7A2029PDQNR, the MC33761SNT1-029G uniquely balances sub-50 µVRMS noise, 1.0 V logic compatibility, and 40 µs startup in a standard 5-pin SOT-23 - making it optimal for space-constrained, burst-mode RF systems where all three attributes are simultaneously required.
Availability
MC33761SNT1-029G is available at Aetrix Electronics and suitable for RF transceiver power supplies, portable medical sensors, and low-power IoT edge nodes requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MC33761SNT1-029G 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 innovation for automotive, industrial, cloud, and intelligent edge applications.
The MC33761SNT1-029G belongs to onsemi's ultra-low-noise LDO family, engineered specifically for RF and burst-mode portable electronics where noise, startup speed, and 1.0 V logic compatibility are non-negotiable design constraints.
FAQ
What is the maximum input voltage rating for MC33761SNT1-029G?
The MC33761SNT1-029G supports a maximum input voltage of 12 V, as specified in its Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable 2.9 V output regulation, the recommended minimum input is Vout + 1.0 V (i.e., ≥3.9 V), with dropout voltage rising linearly with load current - e.g., 160 mV at 80 mA.
Does MC33761SNT1-029G require an external bypass capacitor for noise reduction?
No, the MC33761SNT1-029G does not require an external bypass capacitor. Its proprietary architecture achieves 40 µVRMS (100 Hz–100 kHz) output noise without one - a key differentiator versus conventional LDOs. This eliminates associated board area, cost, and startup delay, while maintaining stability with only a 1.0 µF output capacitor.
What is the ON/OFF control voltage threshold for MC33761SNT1-029G?
The MC33761SNT1-029G features a 900 mV typical logic-high threshold (ON state) and 150 mV typical logic-low threshold (OFF state) on its ON/OFF pin. This 1.0 V platform compatibility allows direct interfacing with modern low-voltage microcontrollers and baseband ICs without level-shifting circuitry.
How does MC33761SNT1-029G handle fast load transients in burst-mode systems?
The MC33761SNT1-029G incorporates a patented load transient improvement architecture that actively detects output voltage overshoot decay and forces rapid return to regulation - preventing deep undershoot during consecutive current bursts. This is validated in Figures 10–11 of the datasheet and essential for TDMA/GSM transmit slot integrity.
Is MC33761SNT1-029G thermally protected?
Yes, the MC33761SNT1-029G includes internal thermal shutdown that activates at approximately 125°C junction temperature. Once triggered, the device disables output until junction temperature falls below the hysteresis threshold (~15°C below trip point), protecting against sustained overload or inadequate heatsinking in compact enclosures.
MC33761SNT1-029G 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):
- 2.9V
- 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
MC33761SNT1-029G FAQ
1.How can I place an order for MC33761SNT1-029G through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33761SNT1-029G 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 MC33761SNT1-029G reliable?
The price and inventory of MC33761SNT1-029G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33761SNT1-029G is usually 5 days.
3.What payment methods are accepted for MC33761SNT1-029G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33761SNT1-029G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33761SNT1-029G?
MC33761SNT1-029G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33761SNT1-029G 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 MC33761SNT1-029G?
For technical support, including MC33761SNT1-029G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33761SNT1-029G requirements.
6.How does Aetrix verify that MC33761SNT1-029G is sourced from the original manufacturer or authorized distributors?
All MC33761SNT1-029G 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 MC33761SNT1-029G meets industry standards.
7.What is the process for return or replacement of MC33761SNT1-029G?
All MC33761SNT1-029G units undergo pre-shipment inspection (PSI). If there is an issue with MC33761SNT1-029G, 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 MC33761SNT1-029G part is unused and in its original packaging.
Return procedure for MC33761SNT1-029G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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