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onsemi MC33761SNT1-028G
- Part No.:
- MC33761SNT1-028G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MC33761SNT1-028G.pdf
- Description:
- IC REG LINEAR 2.8V 80MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,528
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Product details
Overview
MC33761SNT1-028G from onsemi is a 2.8 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 1.0 V ON/OFF control logic compatible with 1.0 V platforms. It delivers stable power to noise-sensitive RF stages and burst-mode portable systems.
For engineers reviewing the MC33761SNT1-028G datasheet, pinout, applications, or equivalent options, key selection criteria include low-noise performance without bypass capacitor, fast 40 µs wake-up response, thermal shutdown protection, and compatibility with 1.0 V logic control in space-constrained battery-powered designs.
Technical Context
The MC33761SNT1-028G employs a proprietary PNP pass transistor architecture with integrated load transient improvement circuitry that actively detects output overshoot decay and forces rapid return to regulation-eliminating deep undershoot during rapid current bursts. Its bandgap reference operates without external capacitor, enabling both ultra-low noise and sub-40 µs startup.
Static line regulation exceeds −75 dB, and ripple rejection is 70 dB at 1 kHz. The device achieves 1.5% output voltage accuracy at 25°C and maintains ±3.0% over −40°C to +85°C, with thermal shutdown triggered at 125°C and internal current limiting up to 180 mA typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.8 V ±2.8% (−40°C to +85°C), enabling precise biasing of RF VCOs and analog front-ends |
| Noise Performance | 40 µVRMS (100 Hz–100 kHz), sufficient for VCO supply without external bypass capacitor |
| Dropout Voltage | 90 mV @ 30 mA, allowing operation with minimal input–output differential in low-voltage systems |
| ON/OFF Control | 900 mV logic-high threshold, compatible with 1.0 V I/O domains and enabling direct interface to low-voltage microcontrollers |
| Startup Time | 40 µs typical (200 Hz repetitive), eliminating delay from external bypass capacitor charging |
| Load Regulation | 40 mV max (1–80 mA), ensuring stable output under dynamic load changes in TDMA burst systems |
| Ripple Rejection | 70 dB @ 1 kHz, suppressing switching noise from upstream DC/DC converters |
Pinout & Package
MC33761SNT1-028G 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 2.8 V + 1.0 V to 12 V input; supports wide-input battery and post-regulation applications |
| 2 - GND | Ground reference | Common return path for internal bias and output current; requires low-inductance PCB connection |
| 3 - ON/OFF | Enable/disable control | Active-high logic input; 900 mV threshold enables direct drive from 1.0 V GPIO without level-shifting |
| 4 - NC | No-connect terminal | Internally unconnected; must remain floating or tied to GND-no functional impact in pin-to-pin replacements |
| 5 - Vout | Regulated output | Delivers 2.8 V ±2.8%; requires ≥1.0 µF ceramic/tantalum output capacitor for stability across ESR range |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-noise architecture | 40 µVRMS noise without external bypass capacitor-reduces BOM count and PCB area while maintaining VCO phase noise integrity |
| Load transient improvement | Eliminates deep undershoot during rapid load reappearance after zero-current decay-critical for TDMA phone burst timing |
| 1.0 V-compatible enable | 900 mV ON threshold allows direct interface to 1.0 V core logic, avoiding level-shifters in modern SoC power sequencing |
| Fast wake-up response | 40 µs typical startup time enables efficient duty-cycled operation in battery-powered sensors and wireless transceivers |
| Thermal and current protection | 125°C thermal shutdown and 180 mA current limit ensure robustness during overload or poor heatsinking conditions |
Applications
| RF VCO Power Supply | TDMA Burst Transmitter |
|---|---|
|
Use Scenario: Powering voltage-controlled oscillators in GSM/GPRS handsets where phase noise directly impacts adjacent-channel leakage. IC Role / Device Role / Timing Role: Low-noise, fast-response LDO supplying clean 2.8 V bias to VCO core and tuning varactors. Use Value: 40 µVRMS noise prevents degradation of VCO phase noise floor; no bypass capacitor avoids startup delay and layout sensitivity. |
Use Scenario: Regulating power to RF power amplifier stages in time-division multiple access (TDMA) systems with 200 Hz burst repetition. IC Role / Device Role / Timing Role: Enabling/disabling regulated 2.8 V rail synchronized to TDMA slot timing via 1.0 V GPIO. Use Value: 40 µs wake-up ensures full regulation before PA turn-on; load transient improvement prevents undershoot-induced spectral splatter. |
| Portable Audio Codec Bias | Low-Power Sensor Node Core |
|
Use Scenario: Providing ultra-clean analog supply to stereo audio codecs in Bluetooth headsets and wearables. IC Role / Device Role / Timing Role: Delivering stable 2.8 V to ADC/DAC reference and analog signal paths with minimal PSRR coupling. Use Value: −75 dB static line regulation suppresses ripple from shared battery rails; 1.5% initial accuracy ensures consistent SNR across units. |
Use Scenario: Powering ultra-low-power microcontroller cores and analog sensor interfaces in coin-cell–operated IoT nodes. IC Role / Device Role / Timing Role: Acting as primary regulated rail, enabled only during active sensing/transmission cycles. Use Value: 0.1 µA OFF-state current extends battery life; 90 mV dropout maximizes usable battery voltage range down to 2.9 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP114AMX28TBG | 2.8 V, 150 mA, 25 µVRMS noise, but requires 1.0 V logic-level enable and has 120 mV dropout @ 30 mA | Higher noise density (25 nV/√Hz @ 10 kHz) and slower 100 µs startup limit suitability for VCOs requiring <40 µVRMS | Preferred when higher output current and tighter load regulation are prioritized over absolute lowest noise |
| MCP1700T-2802E/TT | 2.8 V, 250 mA, 30 µVRMS, but uses NMOS pass device and lacks load transient improvement circuitry | No active undershoot suppression-exhibits >150 mV undershoot in burst-load tests per datasheet Figure 4-12 | Suitable for non-burst applications like always-on sensor bias, where fast transient recovery is not required |
Compared with NCP114AMX28TBG and MCP1700T-2802E/TT, the MC33761SNT1-028G uniquely combines ultra-low noise, burst-mode transient immunity, and 1.0 V logic compatibility-making it the only option among the three validated for RF VCO supply in TDMA systems.
Availability
MC33761SNT1-028G is available at Aetrix Electronics and suitable for noise-sensitive RF power supplies, TDMA burst transmitters, and low-power portable audio systems requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for MC33761SNT1-028G 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, and sensor solutions for automotive, industrial, and portable electronics.
The MC33761SNT1-028G belongs to onsemi's ultra-low-noise LDO family designed specifically for RF and burst-mode portable applications where traditional LDOs fail due to noise, slow startup, or transient undershoot.
FAQ
What is the maximum input voltage rating for MC33761SNT1-028G?
The MC33761SNT1-028G supports a maximum input voltage of 12 V on its Vin pin, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable 2.8 V output, the recommended minimum input is Vout + 1.0 V (i.e., 3.8 V), with dropout increasing linearly beyond that point per the characterization curves.
Does MC33761SNT1-028G require an external bypass capacitor for noise reduction?
No, the MC33761SNT1-028G does not require an external bypass capacitor. Its proprietary architecture achieves 40 µVRMS noise (100 Hz–100 kHz) inherently-eliminating the need for a bypass cap that would otherwise slow startup and add cost and board area. This is explicitly confirmed in the datasheet's "Noise Decoupling" section and Figure 17.
What is the function of Pin 4 (NC) on MC33761SNT1-028G?
Pin 4 on the MC33761SNT1-028G is a no-connect (NC) terminal with no internal connection. The datasheet states it "makes no arm to connect the pin to a known potential," meaning it may be left floating or tied to GND without affecting operation. It exists for mechanical compatibility and is not used in the MC33761SNT1-028G's internal circuitry.
How does MC33761SNT1-028G handle fast load transients in burst-mode systems?
The MC33761SNT1-028G implements patented load transient improvement circuitry that detects output voltage overshoot decay and forces rapid return to regulation-preventing deep undershoot when load reappears after zero-current periods. This behavior is documented in Figures 8–11 and distinguishes it from standard LDOs in TDMA and pulsed RF applications.
What output capacitor value and type are recommended for MC33761SNT1-028G?
The MC33761SNT1-028G requires a minimum 1.0 µF output capacitor, and the datasheet explicitly permits ceramic or tantalum types across a wide ESR range (a few mΩ to 3.0 Ω). Unlike conventional LDOs, it does not require a specific ESR for stability-enabling flexible, low-ESR ceramic capacitor use without risk of oscillation.
MC33761SNT1-028G 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):
- 2.8V
- 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
MC33761SNT1-028G FAQ
1.How can I place an order for MC33761SNT1-028G through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33761SNT1-028G 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 MC33761SNT1-028G reliable?
The price and inventory of MC33761SNT1-028G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33761SNT1-028G is usually 5 days.
3.What payment methods are accepted for MC33761SNT1-028G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33761SNT1-028G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33761SNT1-028G?
MC33761SNT1-028G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33761SNT1-028G 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 MC33761SNT1-028G?
For technical support, including MC33761SNT1-028G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33761SNT1-028G requirements.
6.How does Aetrix verify that MC33761SNT1-028G is sourced from the original manufacturer or authorized distributors?
All MC33761SNT1-028G 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 MC33761SNT1-028G meets industry standards.
7.What is the process for return or replacement of MC33761SNT1-028G?
All MC33761SNT1-028G units undergo pre-shipment inspection (PSI). If there is an issue with MC33761SNT1-028G, 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 MC33761SNT1-028G part is unused and in its original packaging.
Return procedure for MC33761SNT1-028G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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