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onsemi NCP508MT33TBG
- Part No.:
- NCP508MT33TBG
- Manufacturer:
- onsemi
- Package:
- 6-WFDFN
- Datasheet:
-
NCP508MT33TBG.pdf
- Description:
- IC REG LINEAR 3.3V 50MA 6WDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,414
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Product details
Overview
NCP508MT33TBG from onsemi is a 50 mA, 3.3 V fixed-output low dropout (LDO) voltage regulator in WDFN6 1.5×1.5 mm package, featuring 140 mV typical dropout at 30 mA, 70 dB ripple rejection at 1 kHz, and 39 µVRMS output noise (100 Hz–100 kHz), designed for RF subsystems and noise-sensitive analog circuits.
For engineers reviewing the NCP508MT33TBG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal behavior, enable-controlled power sequencing, ceramic-capacitor compatibility, and validated alternatives for low-noise power delivery in compact portable designs.
Technical Context
The NCP508MT33TBG integrates a PMOS pass transistor with internal voltage reference, error amplifier, and protection circuitry (current limit, thermal shutdown). Its architecture enables fast 20 µs enable turn-on and stable operation with ceramic output capacitors down to 1.0 µF.
It operates across −40°C to +85°C ambient, supports input voltages up to 7.0 V (recommended), and maintains regulation with input-to-output differentials as low as 140 mV at 30 mA - critical for battery-powered systems where headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% (25°C), ±3% (−40°C to +85°C) - ensures stable biasing for 3.3 V logic and RF ICs without external feedback. |
| Dropout Voltage | 140 mV (typ) at 30 mA - allows operation from 3.44 V input, extending usable battery life in single-cell Li-ion or 3.6 V supply rails. |
| Ripple Rejection | 70 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding sensitive VCOs or PLLs. |
| Output Noise | 39 µVRMS (100 Hz–100 kHz) - meets stringent spectral purity requirements for RF front-ends without bypass capacitor. |
| Enable Threshold | VTH(HI) = 0.9 V, VTH(LO) = 0.15 V - compatible with 1.8 V/3.3 V GPIOs for precise system-level power control. |
| Quiescent Current | 0.1 µA (typ) in shutdown - minimizes leakage current during standby in always-on sensor or IoT edge nodes. |
| Thermal Resistance | RJA = 313 °C/W (WDFN6, 30×30 mm PCB, 1 oz Cu) - requires minimal copper area for thermal management in space-constrained layouts. |
Pinout & Package
Package: WDFN6 (1.5 mm × 1.5 mm, 0.5 mm pitch, exposed thermal pad), Pb-free, moisture sensitivity level 1 (MSL1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Enable | Active-high digital control input; pulled high to Vin for always-on operation; <0.15 V disables regulator with µA-level shutdown current. |
| 2 | GND | Power ground reference for internal circuitry and pass transistor; must be connected to low-impedance PCB ground plane. |
| 3 | Enable (NC) | No-connect terminal - electrically isolated; no external connection required or permitted. |
| 4 | Vin | Unregulated input supply (max 7.0 V recommended); requires ≥1.0 µF ceramic decoupling placed adjacent to pin. |
| 5 | Vout | Regulated 3.3 V output; stable with 1.0 µF–10 µF ceramic capacitors (ESR 1 mΩ–3 Ω); supports fast load transients per Figure 25. |
| 6 | Exposed Pad | Thermal and electrical ground connection; must be soldered to solid PCB copper pour for RJA = 313 °C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise without bypass cap | 39 µVRMS output noise enables direct powering of VCOs and ADC references without added filtering components. |
| Ceramic capacitor stability | Stable with 1.0 µF X7R/X5R MLCCs (ESR 1–3 Ω), eliminating need for tantalum or electrolytic capacitors and reducing BOM cost/size. |
| Fast enable response | 20 µs turn-on time (10%→95%) supports dynamic power gating in multi-rail SoC subsystems and low-power wake-up sequences. |
| Robust protection suite | Integrated current limiting (100–250 mA), thermal shutdown (125°C), and ESD rating >2 kV HBM ensure reliability in handheld and industrial environments. |
| Pb-free WDFN6 package | 1.5×1.5 mm footprint with exposed thermal pad reduces PCB area by >50% vs. SC-88A while improving thermal performance by 56% (RJA 313 vs. 200 °C/W). |
Applications
| RF Power Amplifier Biasing | VCO/PLL Core Supply |
|---|---|
|
Use Scenario: Providing clean, low-noise bias to GaAs or SiGe RF power amplifiers in cellular handset front-ends. IC Role / Device Role / Timing Role: LDO regulator delivering stable 3.3 V with minimal PSRR-induced phase noise degradation. Use Value: 70 dB ripple rejection prevents switching artifacts from DC/DC converters from modulating PA output spectrum. |
Use Scenario: Supplying core voltage to voltage-controlled oscillators and phase-locked loops in wireless transceivers. IC Role / Device Role / Timing Role: Ultra-low-noise 3.3 V source minimizing close-in phase noise and jitter accumulation. Use Value: 39 µVRMS noise directly translates to <−155 dBc/Hz phase noise floor at 10 kHz offset for 2.4 GHz VCOs. |
| Portable Medical Sensor Front-End | IoT Edge Node Microcontroller Core |
|
Use Scenario: Powering precision analog signal chains (ECG, pulse oximetry) in battery-operated wearable monitors. IC Role / Device Role / Timing Role: Low-dropout regulator enabling operation down to 3.44 V input while maintaining 3.3 V accuracy. Use Value: Tight ±2% output tolerance and 6 mV load regulation preserve ADC reference integrity across 1–50 mA dynamic loads. |
Use Scenario: Supplying 3.3 V core rail to ARM Cortex-M microcontrollers in ultra-low-power IoT endpoints. IC Role / Device Role / Timing Role: Enable-controlled LDO enabling firmware-driven sleep/wake cycles with sub-µA quiescent current. Use Value: 0.1 µA shutdown current extends shelf life and battery runtime in devices requiring years of operation on coin cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/MB | 30 mA output, 170 mV dropout (typ), 65 dB RR at 1 kHz, 40 µVRMS noise - lower current drive and slightly higher dropout than NCP508MT33TBG. | Suitable for ultra-low-IQ (only 1.6 µA active) applications where 50 mA peak load is not required. | Select when minimum active quiescent current is prioritized over output current capability and transient response speed. |
| Torex XC6206P332MR-G | 150 mA output, 200 mV dropout (typ), 55 dB RR at 1 kHz, 50 µVRMS noise - higher current but lower PSRR and higher noise than NCP508MT33TBG. | Better suited for general-purpose digital I/O rails where noise sensitivity is moderate and load steps exceed 50 mA. | Select when higher output current headroom is needed and RF-grade noise performance is not mandatory. |
Compared with MCP1700T-3302E/MB and XC6206P332MR-G, the NCP508MT33TBG uniquely balances 50 mA drive, 70 dB ripple rejection, and 39 µVRMS noise in a thermally efficient WDFN6 package - making it optimal for RF and precision analog subsystems where all three parameters are simultaneously critical.
Availability
NCP508MT33TBG is available at Aetrix Electronics and suitable for RF front-end modules, portable medical sensors, IoT edge nodes, and low-noise analog signal chains requiring stable component supply despite its discontinued status through legacy channel support.
Supply support for NCP508MT33TBG 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, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCP508 series was developed specifically for noise-sensitive portable electronics, emphasizing ultra-low output noise, fast enable response, and ceramic-capacitor compatibility to replace older bipolar-based LDOs in space-constrained RF designs.
FAQ
What is the maximum input voltage rating for the NCP508MT33TBG?
The absolute maximum input voltage for the NCP508MT33TBG is 13.0 V, but the recommended operating maximum is 7.0 V per the datasheet's Recommended Operating Conditions table. Exceeding 7.0 V may increase dropout voltage, reduce PSRR, and accelerate thermal stress - especially under full 50 mA load. For reliable long-term operation in battery-powered systems, keep Vin ≤ 7.0 V.
Does the NCP508MT33TBG require an external bypass capacitor to achieve its specified 39 µVRMS noise performance?
No, the NCP508MT33TBG achieves 39 µVRMS output noise (100 Hz–100 kHz) without any external bypass capacitor - a key specification explicitly stated in the Features section and confirmed in Electrical Characteristics. This eliminates BOM cost and board space associated with traditional noise-reduction caps, though a 1.0 µF ceramic output capacitor remains required for stability and transient response.
Is the NCP508MT33TBG pin-compatible with other variants in the NCP508 family, such as NCP508MT30TBG?
Yes, the NCP508MT33TBG shares identical WDFN6 pinout, package dimensions, and terminal assignments with all other WDFN6-packaged NCP508 variants (e.g., NCP508MT30TBG, NCP508MT25TBG). Pin 1 = Enable, Pin 2 = GND, Pin 3 = NC, Pin 4 = Vin, Pin 5 = Vout, Pin 6 = Exposed Pad - enabling direct voltage-option substitution without PCB layout changes.
How does the thermal performance of the NCP508MT33TBG compare between WDFN6 and SC-88A packages?
The WDFN6 package used by the NCP508MT33TBG has RJA = 313 °C/W (vs. 200 °C/W for SC-88A), but this reflects test conditions on a 30×30 mm PCB with 1 oz Cu. In practice, the WDFN6's exposed thermal pad enables superior heat spreading - achieving up to 56% lower junction temperature rise under identical power dissipation when properly soldered to a large copper pour, making it more suitable for thermally dense layouts.
Can the NCP508MT33TBG be used with tantalum output capacitors, or is it limited to ceramic types?
The NCP508MT33TBG supports both ceramic and tantalum output capacitors, as confirmed in the Applications Information section: "The regulator accepts ceramic chip capacitors as well as tantalum devices." However, ceramic capacitors (X7R/X5R, 1.0–10 µF) are preferred for lowest ESR, smallest footprint, and guaranteed stability across temperature - while tantalum types require careful ESR selection (1–3 Ω) to avoid instability.
NCP508MT33TBG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.18V @ 50mA (Typ)
- Current - Output:
- 50mA
- Current - Quiescent (Iq):
- 1 µA
- Current - Supply (Max):
- 1.9 mA
- PSRR:
- 70dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WDFN (1.5x1.5)
NCP508MT33TBG FAQ
1.How can I place an order for NCP508MT33TBG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP508MT33TBG 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 NCP508MT33TBG reliable?
The price and inventory of NCP508MT33TBG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP508MT33TBG is usually 5 days.
3.What payment methods are accepted for NCP508MT33TBG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP508MT33TBG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP508MT33TBG?
NCP508MT33TBG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP508MT33TBG 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 NCP508MT33TBG?
For technical support, including NCP508MT33TBG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP508MT33TBG requirements.
6.How does Aetrix verify that NCP508MT33TBG is sourced from the original manufacturer or authorized distributors?
All NCP508MT33TBG 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 NCP508MT33TBG meets industry standards.
7.What is the process for return or replacement of NCP508MT33TBG?
All NCP508MT33TBG units undergo pre-shipment inspection (PSI). If there is an issue with NCP508MT33TBG, 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 NCP508MT33TBG part is unused and in its original packaging.
Return procedure for NCP508MT33TBG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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