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onsemi NCP508MT18TBG
- Part No.:
- NCP508MT18TBG
- Manufacturer:
- onsemi
- Package:
- 6-WFDFN
- Datasheet:
-
NCP508MT18TBG.pdf
- Description:
- IC REG LINEAR 1.8V 50MA 6WDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,668
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Product details
Overview
NCP508MT18TBG from onsemi is a 50 mA, 1.8 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 powering noise-sensitive RF subsystems and precision analog circuitry.
For engineers reviewing the NCP508MT18TBG datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low noise performance, fast 20 µs enable turn-on time, logic-level enable interface, ceramic-capacitor compatibility, and thermal-limited operation up to +85 °C ambient.
Technical Context
The NCP508MT18TBG integrates a PMOS pass transistor, precision voltage reference, error amplifier, and thermal/current-limit protection circuits. Its architecture enables stable regulation with ceramic output capacitors as low as 1.0 µF and supports ESR ranging from a few mΩ to 3 Ω.
It operates with input voltages from 1.9 V to 7.0 V (recommended max), delivers tight load regulation (6 mV typical over 1–50 mA), and maintains output accuracy within ±2% at 25 °C and ±3% across −40 °C to +85 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% (25 °C), ±3% (−40 °C to +85 °C) |
| Max Output Current | 50 mA - sufficient for powering single-core microcontrollers, RF front-end bias rails, or sensor signal chains |
| Dropout Voltage | 140 mV (typ) at 30 mA - enables operation from 1.94 V input while sustaining 1.8 V output |
| Ripple Rejection | 70 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding RF sections |
| Output Noise | 39 µVRMS (100 Hz–100 kHz) - meets stringent requirements of VCOs and PLLs without bypass capacitor |
| Enable Threshold | 0.9 V (logic high), 0.15 V (logic low) - compatible with 1.8 V GPIO and open-drain control signals |
| Quiescent Current | 0.1 µA (typ) in shutdown - enables ultra-low-power system sleep modes |
Pinout & Package
Package: WDFN6 (1.5 mm × 1.5 mm, 0.5 mm pitch), Pb-free, exposed thermal pad (pin 6 = GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Enable | Active-high digital control input; tie to Vin if unused |
| 2 | NC | No-connect - must remain unconnected per datasheet |
| 3 | Vout | Regulated 1.8 V output; requires ≥1.0 µF ceramic decoupling capacitor |
| 4 | GND | Power ground reference; connects to exposed thermal pad for thermal dissipation |
| 5 | Vin | Input supply (1.9–7.0 V); requires ≥1.0 µF input capacitor for transient stability |
| 6 | GND (exposed pad) | Thermal and electrical ground connection - must be soldered to PCB copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 39 µVRMS output noise without bypass capacitor - eliminates need for secondary filtering in RF bias rails |
| Fast enable response | 20 µs turn-on time (10% to 95%) - supports dynamic power sequencing in battery-powered devices |
| Ceramic capacitor compatibility | Stable with 1.0 µF MLCC output capacitors and ESR 0.005–3 Ω - reduces BOM count and board space vs. tantalum solutions |
| Integrated protection | Current limit (100–250 mA), thermal shutdown (125 °C), and reverse-voltage safe inputs - enhances system reliability without external components |
| Pb-free WDFN6 package | 1.5×1.5 mm footprint with exposed thermal pad - enables high-density layouts and improved thermal resistance (313 °C/W on 30×30 mm PCB) |
Applications
| RF Handset Subsystems | VCO/PLL Power Rails |
|---|---|
Use Scenario: Powering low-noise amplifiers (LNAs) and mixer bias circuits in 4G/5G mobile transceivers. IC Role / Device Role / Timing Role: Primary LDO supplying clean 1.8 V to RF analog blocks where switching noise degrades EVM and adjacent channel leakage. Use Value: 39 µVRMS noise and 70 dB ripple rejection prevent baseband interference and maintain >30 dB ACLR in LTE bands. |
Use Scenario: Providing regulated supply to voltage-controlled oscillators and phase-locked loops in wireless infrastructure timing modules. IC Role / Device Role / Timing Role: Low-phase-noise bias source ensuring minimal VCO tuning voltage perturbation from supply ripple. Use Value: 140 mV dropout enables direct use of partially discharged Li-ion cells (≥2.0 V), extending operational runtime without compromising jitter performance. |
| Portable Medical Sensors | Industrial IoT Edge Nodes |
Use Scenario: Supplying precision ADC reference buffers and op-amp signal conditioning stages in wearable ECG/PPG monitors. IC Role / Device Role / Timing Role: Ultra-stable analog rail generator maintaining <±0.5 mV drift over temperature for sub-16-bit measurement accuracy. Use Value: ±3% output tolerance across −40 °C to +85 °C and 6 mV load regulation ensure consistent gain calibration without software compensation. |
Use Scenario: Powering ultra-low-power microcontrollers (e.g., ARM Cortex-M0+) and LoRaWAN transceivers in battery-operated condition monitoring nodes. IC Role / Device Role / Timing Role: Enable-controlled power domain manager enabling deep-sleep current <1 µA via logic-level shutdown. Use Value: 0.1 µA quiescent current in disable mode extends 10-year battery life in sealed industrial deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | 30 mA output, 170 mV dropout (250 mA load), no enable pin, SOT-23-3 package | Lacks enable control and thermal shutdown; limited to lower-current analog sensors | Select when enable functionality and 50 mA headroom are not required, and cost minimization is critical |
| TZB1805020000 | 50 mA, 1.8 V, 120 mV dropout, 45 µVRMS noise, SC-70-5 package | Higher noise floor and smaller thermal pad - less suitable for sustained 50 mA loads above 60 °C ambient | Prefer for space-constrained designs where 39 µVRMS noise and WDFN6 thermal performance are non-negotiable |
Compared with MCP1700T-1802E/TT and TZB1805020000, the NCP508MT18TBG uniquely combines 50 mA capability, 39 µVRMS noise, logic-enable control, and WDFN6 thermal robustness - making it optimal for thermally demanding, noise-critical RF and precision analog applications.
Availability
NCP508MT18TBG is available at Aetrix Electronics and suitable for RF handset design, VCO/PLL power management, portable medical sensing, industrial IoT edge nodes, and precision analog signal chain applications requiring stable component supply and long-term manufacturability.
Supply support for NCP508MT18TBG 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, cloud, and consumer markets.
The NCP508MT18TBG belongs to the NCP508 family of ultra-low-noise LDO regulators, engineered specifically for powering noise-sensitive RF and analog circuits in battery-operated and thermally constrained systems.
FAQ
What is the maximum input voltage rating for the NCP508MT18TBG?
The NCP508MT18TBG has an absolute maximum input voltage of 13.0 V, but its recommended operating input voltage is limited to 7.0 V per the datasheet's Recommended Operating Conditions table. Exceeding 7.0 V may degrade long-term reliability and is not validated for parametric performance - always operate within the 1.9 V to 7.0 V range for guaranteed 1.8 V regulation and thermal safety.
Does the NCP508MT18TBG require an external bypass capacitor to achieve its specified 39 µVRMS noise?
No, the NCP508MT18TBG achieves 39 µVRMS output noise (100 Hz–100 kHz) without any external bypass capacitor - this value is measured and guaranteed per the Electrical Characteristics table. Adding a bypass capacitor does not further reduce noise but may improve high-frequency PSRR beyond the specified 70 dB at 1 kHz.
Is the NC pin (Pin 2) on the NCP508MT18TBG internally connected or should it be left floating?
Pin 2 of the NCP508MT18TBG is explicitly designated "N/C" (Not Connected) in the Pin Function Description table. It is unconnected internally and must remain unconnected on the PCB - neither tied to GND nor routed. Connecting it risks undefined behavior or damage due to internal floating node coupling.
Can the NCP508MT18TBG sustain 50 mA continuous output current at +85 °C ambient temperature?
Yes, the NCP508MT18TBG is rated for 50 mA output current across −40 °C to +85 °C ambient per the Electrical Characteristics table. However, thermal design is critical: with RJA = 313 °C/W (WDFN6 on 30×30 mm PCB), power dissipation at 50 mA and 1.9 V input yields ~55 mW, resulting in ~17 °C junction rise - well below the 125 °C max junction temperature. Ensure proper thermal pad soldering and PCB copper area.
What is the function of the exposed thermal pad (Pin 6) on the NCP508MT18TBG WDFN6 package?
The exposed thermal pad (Pin 6) on the NCP508MT18TBG serves as both an electrical ground connection and primary thermal conduction path. It must be soldered directly to a PCB GND copper pour to meet thermal resistance specifications (313 °C/W) and ensure reliable operation at full 50 mA load. Leaving it unconnected violates the package mechanical specification and risks thermal shutdown or premature failure.
NCP508MT18TBG 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):
- 1.8V
- 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)
NCP508MT18TBG FAQ
1.How can I place an order for NCP508MT18TBG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP508MT18TBG 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 NCP508MT18TBG reliable?
The price and inventory of NCP508MT18TBG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP508MT18TBG is usually 5 days.
3.What payment methods are accepted for NCP508MT18TBG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP508MT18TBG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP508MT18TBG?
NCP508MT18TBG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP508MT18TBG 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 NCP508MT18TBG?
For technical support, including NCP508MT18TBG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP508MT18TBG requirements.
6.How does Aetrix verify that NCP508MT18TBG is sourced from the original manufacturer or authorized distributors?
All NCP508MT18TBG 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 NCP508MT18TBG meets industry standards.
7.What is the process for return or replacement of NCP508MT18TBG?
All NCP508MT18TBG units undergo pre-shipment inspection (PSI). If there is an issue with NCP508MT18TBG, 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 NCP508MT18TBG part is unused and in its original packaging.
Return procedure for NCP508MT18TBG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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