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onsemi MC33761SNT1-029
- Part No.:
- MC33761SNT1-029
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MC33761SNT1-029.pdf
- Description:
- IC REG LINEAR 2.9V 80MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,605
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Product details
Overview
MC33761SNT1-029 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) noise, 90 mV dropout at 30 mA, and 1.0 V ON/OFF control logic-designed for RF front-ends, TDMA burst systems, and battery-powered instrumentation where supply rail purity and fast wake-up are critical.
For engineers reviewing the MC33761SNT1-029 datasheet, pinout, applications, or equivalent options, key selection criteria include output noise density (150 nV/√Hz @ 100 Hz), thermal shutdown threshold (125°C), load transient improvement architecture, and compatibility with 1.0 µF ceramic output capacitors without ESR constraints.
Technical Context
The MC33761SNT1-029 employs a PNP pass transistor with proprietary load transient improvement circuitry that actively detects output overshoot decay and forces rapid return to regulation-eliminating deep undershoots during rapid current bursts typical in TDMA or pulsed RF systems. Its bandgap reference operates without external bypass capacitor, enabling 40 µs typical startup time.
Static line regulation exceeds −75 dB, and ripple rejection is 70 dB @ 1.0 kHz. The 1.0 V-compatible ON/OFF input accepts 900 mV logic high and 150 mV logic low, with 250 kΩ input resistance-enabling direct interface to 1.0 V I/O domains without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.9 V ±1.5% @ 25°C; ±3.0% over −40°C to +85°C-ensures stable bias for VCOs and low-voltage analog stages. |
| Noise Performance | 150 nV/√Hz @ 100 Hz; 40 µVRMS (100 Hz–100 kHz)-meets stringent spectral purity requirements for RF signal chains. |
| Dropout Voltage | 90 mV @ 30 mA; 160 mV @ 80 mA-supports operation with minimal headroom, e.g., 3.0 V input for 2.9 V output. |
| ON/OFF Control | 900 mV logic high enables; 150 mV logic low disables-directly compatible with 1.0 V platform GPIOs. |
| Startup Time | 40 µs typical (200 Hz repetitive mode)-enables rapid power cycling in burst-mode communication systems. |
| Ripple Rejection | 70 dB @ 1.0 kHz-suppresses switching noise from upstream DC/DC converters feeding the LDO. |
| Thermal Shutdown | Activates at 125°C junction temperature-protects against sustained overload or poor PCB thermal design. |
Pinout & Package
MC33761SNT1-029 is housed in a Pb-free Thin SOT-23-5 (Case 483) package with 0.95 mm maximum height, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Input power supply | Accepts up to 12 V input; requires 1.0 µF input decoupling capacitor placed close to pin. |
| 2 - GND | Ground reference | IC substrate and feedback reference node; must be connected to low-impedance system ground plane. |
| 3 - ON/OFF | Enable/disable control | CMOS-compatible input; 900 mV min high to enable, 150 mV max low to disable; 250 kΩ internal pull-down not present. |
| 4 - NC | No-connect terminal | Internally unconnected; must remain floating-no PCB trace or solder mask required. |
| 5 - Vout | Regulated output | Delivers 2.9 V; requires 1.0 µF minimum ceramic or tantalum output capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise architecture | Eliminates need for external bypass capacitor while maintaining 40 µVRMS noise-reducing BOM count and board area. |
| Load transient improvement | Actively suppresses undershoot during rapid load reappearance after zero-current decay-critical for TDMA and pulsed RF applications. |
| 1.0 V logic-compatible enable | Operates directly from 1.0 V domain outputs without level shifters-simplifies integration with modern low-voltage microcontrollers. |
| ESR-insensitive output stability | Stable with 1.0 µF ceramic capacitors having ESR from <1 mΩ to 3 Ω-enables use of low-cost, small-footprint MLCCs. |
| Fast wake-up response | 40 µs typical turn-on delay enables efficient duty-cycled power management in battery-operated devices. |
Applications
| RF Transceiver Power Rail | TDMA Burst Mode System |
|---|---|
Use Scenario: Supplying local oscillator (VCO) and mixer bias in 2.4 GHz ISM-band transceivers. IC Role / Device Role / Timing Role: Ultra-low-noise voltage source ensuring phase noise floor remains below −120 dBc/Hz at 100 kHz offset. Use Value: 40 µVRMS noise prevents degradation of receiver sensitivity and transmitter spectral mask compliance. | Use Scenario: Powering baseband processor core during 5 ms transmit bursts in GSM/GPRS handsets. IC Role / Device Role / Timing Role: Fast-wake LDO delivering regulated 2.9 V during active slots; disabled between slots to minimize quiescent current. Use Value: 40 µs startup ensures full regulation before first symbol transmission; 0.1–2.0 µA OFF-state current extends battery life. |
| Portable Medical Sensor Node | Low-Power Industrial Data Logger |
Use Scenario: Biasing precision analog front-end (AFE) for ECG or pulse oximetry measurement. IC Role / Device Role / Timing Role: Clean 2.9 V supply isolating sensitive ADC reference and op-amp stages from noisy digital domains. Use Value: 150 nV/√Hz noise density avoids introducing measurable error into sub-µV biomedical signal paths. | Use Scenario: Powering microcontroller and low-power sensor interface in remote environmental monitoring nodes. IC Role / Device Role / Timing Role: Primary LDO supplying MCU core and SPI peripherals during periodic wake-up intervals. Use Value: Dropout of 90 mV at 30 mA allows operation down to 3.0 V battery voltage-extending usable cell life by >15%. |
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, 30 µVRMS noise, 160 mV dropout @ 150 mA; requires 2.2 µF output cap; 1.2 V enable threshold. | Better noise but higher dropout and stricter enable voltage-requires level-shifter for 1.0 V systems. | Select when lower noise is prioritized and 1.2 V enable is available; avoid if 1.0 V logic interface is mandatory. |
| MCP1826-2902E/DB | 2.9 V, 1 A, 45 µVRMS noise, 340 mV dropout @ 1 A; 1.2 V enable; SOT-223 package. | Higher current capability but larger footprint and slower transient response-suited for non-burst, higher-load applications. | Select when >80 mA output is needed and board space permits SOT-223; avoid for space- or noise-critical RF layouts. |
Compared with NCP114AMX29TBG and MCP1826-2902E/DB, the MC33761SNT1-029 uniquely combines 1.0 V enable compatibility, 40 µs startup, and 40 µVRMS noise in a 5-pin SOT-23-making it optimal for compact, burst-mode, RF-sensitive systems where all three attributes are simultaneously required.
Availability
MC33761SNT1-029 is available at Aetrix Electronics and suitable for RF transceiver power rails, TDMA burst-mode systems, and portable medical sensor nodes requiring stable component supply with guaranteed long-term availability and Pb-free compliance.
Supply support for MC33761SNT1-029 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 MC33761SNT1-029 belongs to onsemi's ultra-low-noise LDO family designed specifically for noise-sensitive RF, wireless, and portable instrumentation-where spectral purity, fast dynamic response, and 1.0 V system compatibility are essential.
FAQ
What is the maximum input voltage rating for the MC33761SNT1-029?
The MC33761SNT1-029 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 long-term performance at elevated ambient temperatures, derating is recommended-e.g., limiting Vin to ≤8.3 V when delivering 80 mA at 25°C, based on thermal dissipation limits.
Does the MC33761SNT1-029 require an external bypass capacitor for noise reduction?
No, the MC33761SNT1-029 does not require an external bypass capacitor. Its proprietary ultra-low-noise architecture achieves 40 µVRMS (100 Hz–100 kHz) without one-unlike conventional LDOs. This eliminates associated board space, cost, and startup delay, while enabling the 40 µs typical wake-up time. Adding a bypass capacitor is unnecessary and may degrade transient response.
What output capacitor value and type are recommended for stable operation of the MC33761SNT1-029?
The MC33761SNT1-029 requires a minimum 1.0 µF output capacitor, and is stable with ceramic (MLCC) or tantalum types across a wide ESR range (1 mΩ to 3 Ω). Unlike many LDOs, it imposes no minimum ESR requirement-allowing use of low-ESR ceramic capacitors without risk of oscillation. Placement within 2 mm of the Vout and GND pins is recommended for optimal high-frequency PSRR.
How does the load transient improvement feature of the MC33761SNT1-029 benefit TDMA applications?
The MC33761SNT1-029's load transient improvement circuitry detects output voltage overshoot decay and forces rapid return to regulation-preventing deep undershoot when load current reappears after zero-current periods. In TDMA systems, this eliminates voltage droop during slot transitions, ensuring uninterrupted RF stage bias and preventing bit errors or PLL unlock events caused by supply sag.
What is the quiescent current of the MC33761SNT1-029 in ON and OFF states?
In the ON state, the MC33761SNT1-029 draws 180 µA typical quiescent current (IQON) with no load; in OFF state, it consumes only 0.1–2.0 µA (IQOFF). This ultra-low OFF-state current significantly extends battery life in intermittently powered systems, while the low ON-state IQ minimizes wasted power in always-on subsystems such as real-time clocks or sensor bias rails.
MC33761SNT1-029 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
MC33761SNT1-029 FAQ
1.How can I place an order for MC33761SNT1-029 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33761SNT1-029 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 MC33761SNT1-029 reliable?
The price and inventory of MC33761SNT1-029 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33761SNT1-029 is usually 5 days.
3.What payment methods are accepted for MC33761SNT1-029?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33761SNT1-029 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33761SNT1-029?
MC33761SNT1-029 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33761SNT1-029 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 MC33761SNT1-029?
For technical support, including MC33761SNT1-029 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33761SNT1-029 requirements.
6.How does Aetrix verify that MC33761SNT1-029 is sourced from the original manufacturer or authorized distributors?
All MC33761SNT1-029 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 MC33761SNT1-029 meets industry standards.
7.What is the process for return or replacement of MC33761SNT1-029?
All MC33761SNT1-029 units undergo pre-shipment inspection (PSI). If there is an issue with MC33761SNT1-029, 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 MC33761SNT1-029 part is unused and in its original packaging.
Return procedure for MC33761SNT1-029:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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