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onsemi MC33761SNT1-028
- Part No.:
- MC33761SNT1-028
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MC33761SNT1-028.pdf
- Description:
- IC REG LINEAR 2.8V 80MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,562
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Product details
Overview
MC33761SNT1-028 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 logic-compatible ON/OFF control. It delivers stable power to noise-sensitive RF stages and burst-mode portable systems.
For engineers reviewing the MC33761SNT1-028 datasheet, pinout, applications, or equivalent options, key selection criteria include its 150 nV/√Hz noise density at 100 Hz, 40 µs typical wake-up time, thermal shutdown at 125°C, ±1.5% output accuracy at 25°C, and compatibility with 1.0 µF ceramic output capacitors without ESR constraints.
Technical Context
The MC33761SNT1-028 uses a proprietary PNP pass transistor architecture with integrated load transient improvement circuitry that actively detects and suppresses undershoot during rapid current bursts-critical for TDMA phone RF sections. Its bandgap reference operates without external bypass capacitor, enabling both low noise and fast 40 µs startup.
Static line regulation exceeds −75 dB, and ripple rejection is 70 dB at 1.0 kHz. The ON/OFF pin accepts 900 mV logic-high threshold and draws only 250 kΩ input resistance, making it compatible with 1.0 V platform GPIOs while maintaining <0.1 µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.8 V ±1.5% at 25°C; ±3.0% over −40°C to +85°C - ensures stable biasing for VCOs and RF ICs across industrial temperature range |
| Noise Performance | 150 nV/√Hz @ 100 Hz; 40 µVRMS (100 Hz–100 kHz) - eliminates need for external noise-filtering capacitors in sensitive analog/RF 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 load |
| Startup Time | 40 µs typical (200 Hz repetitive) - supports high-duty-cycle burst modes without supply lag or voltage droop |
| Line Regulation | ≤20 mV over Vin = Vout+1.0 V to 12 V - maintains output stability despite battery sag or noisy DC-DC pre-regulation |
| Ripple Rejection | 70 dB @ 1.0 kHz - attenuates switching noise from upstream converters feeding RF subsystems |
| Quiescent Current | 180 µA in ON state; ≤2.0 µA in OFF state - extends battery life in always-on but intermittently active devices |
Pinout & Package
MC33761SNT1-028 is housed in a Pb-free Thin SOT-23-5 (Case 483) package with 0.95 mm max height, optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Input power supply | Accepts 2.8 V + 1.0 V to 12 V; internal protection limits max dissipation to 470 mW at 25°C ambient |
| 2 - GND | Ground reference | Must be low-impedance connection; shared return path for all internal blocks including error amplifier and thermal sensor |
| 3 - ON/OFF | Logic enable control | 900 mV threshold enables IC; 150 mV disables - compatible with 1.0 V I/O domains without level-shifting |
| 4 - NC | No-connect terminal | Not internally bonded; must remain floating or tied to GND - no electrical function, included for mechanical symmetry |
| 5 - Vout | Regulated output | Requires ≥1.0 µF ceramic capacitor; stable with ESR from near-zero to 3.0 Ω - simplifies decoupling design |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise architecture | 40 µVRMS noise without external bypass capacitor - preserves RF signal integrity while reducing BOM count |
| Load transient improvement | Active overshoot detection and correction - prevents deep undershoot during rapid load reappearance in burst systems |
| 1.0 V logic-compatible enable | 900 mV ON threshold with 250 kΩ input resistance - interfaces directly with low-voltage microcontrollers and baseband processors |
| Thermal shutdown protection | 125°C junction limit with automatic recovery - safeguards against PCB-level thermal runaway in sealed enclosures |
| Stable with wide ESR capacitors | Supports 0–3.0 Ω ESR output caps - allows use of low-cost ceramic, tantalum, or polymer capacitors without stability risk |
Applications
| TDMA Mobile RF Front-End | VCO Bias Supply |
|---|---|
Use Scenario: Powers local oscillator circuits in time-division multiple access (TDMA) handsets where RF sections activate in short, high-current bursts. IC Role / Device Role / Timing Role: Low-noise, fast-wake LDO supplying clean 2.8 V bias to VCO core during active time slots. Use Value: Prevents phase noise degradation and carrier leakage by suppressing 40 µVRMS broadband noise and eliminating undershoot-induced frequency pulling. |
Use Scenario: Provides ultra-stable voltage reference to voltage-controlled oscillators in cellular transceivers and wireless test equipment. IC Role / Device Role / Timing Role: Precision 2.8 V LDO with ±1.5% accuracy and <150 nV/√Hz spectral density serving as VCO tuning rail. Use Value: Reduces close-in phase noise by minimizing supply-induced FM modulation, critical for meeting 3GPP ACLR and EVM specs. |
| Battery-Powered IoT Sensor Node | Portable Medical Diagnostic Module |
Use Scenario: Supplies power to low-power MCU and analog front-end during periodic sensing intervals in coin-cell–powered wearables. IC Role / Device Role / Timing Role: Enable-controlled LDO delivering 2.8 V at up to 80 mA with <2.0 µA shutdown current. Use Value: Extends operational lifetime by >30% versus standard LDOs via sub-µA quiescent draw and 40 µs wake-up enabling microsecond-scale duty cycling. |
Use Scenario: Powers precision ADC reference buffers and op-amp signal chains in handheld ultrasound or ECG analyzers. IC Role / Device Role / Timing Role: Ultra-low-noise 2.8 V regulator ensuring <0.01% gain stability and minimal baseline drift in analog measurement paths. Use Value: Enables 16-bit effective resolution by limiting supply-induced noise contribution to <0.5 LSB RMS across full bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A2028PDQNR | 2.8 V, 300 mA, 12 µVRMS noise (10 Hz–100 kHz), 0.5 µA IQ, but requires 1.8 V min input and lacks 1.0 V logic enable | Better noise and IQ, but incompatible with 1.0 V control logic and lower Vin range - suited for higher-Vin, lower-noise apps only | Select when ultra-low IQ and sub-20 µV noise are mandatory and system supports 1.8 V+ input and 1.8 V GPIOs |
| NCP1117ST28T3G | 2.85 V fixed, 1 A, 45 µVRMS noise (10 Hz–100 kHz), 6 mV dropout at 100 mA, but 1.25 V logic threshold and SOT-223 package | Higher current, larger footprint, higher enable voltage - not suitable for 1.0 V platforms or space-constrained layouts | Choose for cost-sensitive, high-current linear regulation where board area and logic compatibility are secondary |
Compared with TPS7A2028PDQNR and NCP1117ST28T3G, the MC33761SNT1-028 uniquely balances 1.0 V logic enable, 40 µs wake-up, and 40 µVRMS noise in a 5-pin SOT-23 - making it the only option for compact, battery-powered burst-mode RF systems requiring direct 1.0 V GPIO interfacing.
Availability
MC33761SNT1-028 is available at Aetrix Electronics and suitable for TDMA RF front-ends, portable medical diagnostics, and battery-powered IoT sensor nodes requiring stable component supply with guaranteed long-term availability.
Supply support for MC33761SNT1-028 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 IoT applications.
The MC33761SNT1-028 belongs to onsemi's ultra-low-noise LDO family designed specifically for RF and burst-mode portable electronics where supply noise, startup latency, and 1.0 V logic compatibility are system-critical constraints.
FAQ
What is the minimum input voltage required for MC33761SNT1-028 to regulate 2.8 V output?
The MC33761SNT1-028 requires Vin ≥ Vout + 1.0 V for guaranteed regulation, so minimum input is 3.8 V under full-load conditions. At light loads, it can operate down to ~3.0 V due to its 90 mV dropout at 30 mA, but datasheet specifications assume Vin ≥ Vout + 1.0 V for all performance parameters including noise and line regulation.
Does MC33761SNT1-028 require an external bypass capacitor to achieve its specified 40 µVRMS noise performance?
No - the MC33761SNT1-028 achieves its 40 µVRMS (100 Hz–100 kHz) noise specification without any external bypass capacitor. Its proprietary internal architecture eliminates the need for a traditional 10 nF–100 nF bypass cap, enabling faster 40 µs startup and reducing component count in noise-sensitive designs.
Can MC33761SNT1-028 be used with ceramic output capacitors having zero ESR?
Yes - the MC33761SNT1-028 is explicitly characterized and stable with ceramic capacitors exhibiting ESR from near-zero up to 3.0 Ω. This eliminates ESR-matching requirements common in older LDOs and allows direct use of low-ESR X7R/X5R MLCCs without added series resistance.
What is the maximum output current capability of MC33761SNT1-028 before current limiting engages?
The MC33761SNT1-028 provides a nominal 80 mA output with peak capability up to 100 mA (min), 180 mA (typ), and 500 mA (max) before current limiting activates. At 100 mA, output voltage drops to Voutnom − 0.3 V per datasheet test condition, confirming robust short-circuit and overload resilience.
How does the load transient improvement feature in MC33761SNT1-028 differ from standard LDO response behavior?
Unlike standard LDOs that exhibit deep undershoot when load reappears during output voltage decay, the MC33761SNT1-028 actively detects overshoot decay and forces rapid return to steady-state - cutting undershoot amplitude by >50% and accelerating recovery time. This is verified in Figures 10–11 of the datasheet and is essential for TDMA and pulsed RF systems.
MC33761SNT1-028 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
MC33761SNT1-028 FAQ
1.How can I place an order for MC33761SNT1-028 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33761SNT1-028 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 MC33761SNT1-028 reliable?
The price and inventory of MC33761SNT1-028 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33761SNT1-028 is usually 5 days.
3.What payment methods are accepted for MC33761SNT1-028?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33761SNT1-028 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33761SNT1-028?
MC33761SNT1-028 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33761SNT1-028 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 MC33761SNT1-028?
For technical support, including MC33761SNT1-028 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33761SNT1-028 requirements.
6.How does Aetrix verify that MC33761SNT1-028 is sourced from the original manufacturer or authorized distributors?
All MC33761SNT1-028 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 MC33761SNT1-028 meets industry standards.
7.What is the process for return or replacement of MC33761SNT1-028?
All MC33761SNT1-028 units undergo pre-shipment inspection (PSI). If there is an issue with MC33761SNT1-028, 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 MC33761SNT1-028 part is unused and in its original packaging.
Return procedure for MC33761SNT1-028:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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