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onsemi NCP508SQ25T1G
- Part No.:
- NCP508SQ25T1G
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP508SQ25T1G.pdf
- Description:
- IC REG LINEAR 2.5V 50MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:2,953
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Product details
Overview
NCP508SQ25T1G from onsemi is a 50 mA, 2.5 V fixed-output low dropout (LDO) voltage regulator in SC-88A package, featuring 140 mV typical dropout at 30 mA, 70 dB ripple rejection at 1 kHz, and 39 µVRMS output noise without bypass capacitor - designed for powering noise-sensitive RF subsystems and PLL/VCO circuits.
For engineers reviewing the NCP508SQ25T1G datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, package mapping, real-world use scenarios, and validated alternative options - all grounded in onsemi's official NCP508/D datasheet Rev. 6 (Jan 2026).
Technical Context
The NCP508SQ25T1G integrates a PMOS pass transistor, precision voltage reference, error amplifier, and thermal/overcurrent protection. Its architecture enables fast 20 µs enable turn-on and stable operation with ceramic capacitors as low as 1.0 µF.
It operates across −40 °C to +85 °C ambient, supports input voltages up to 7.0 V (recommended), and maintains regulation down to 140 mV input–output differential at 30 mA load - with tight ±2% output tolerance at 25 °C and ±3% over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2% at 25 °C; ±3% over −40 °C to +85 °C - ensures stable biasing for analog/RF ICs requiring precise supply rails. |
| Max Output Current | 50 mA - sufficient for low-power RF front-ends, sensor signal chains, and microcontroller I/O peripherals. |
| Dropout Voltage | 140 mV (typ) at 30 mA - enables operation from single-cell Li-ion or 3.3 V rails with minimal headroom loss. |
| Ripple Rejection | 70 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog circuitry. |
| Output Noise | 39 µVRMS (100 Hz–100 kHz) - meets stringent requirements of VCOs and PLLs where phase noise directly correlates to supply noise. |
| Enable Threshold | Logic-compatible: turns on when Enable ≥ 0.9 V, off when ≤ 0.15 V - allows direct interfacing with 1.8 V/2.5 V/3.3 V GPIOs. |
| Quiescent Current | 0.1 µA (typ) in shutdown - preserves battery life in always-on monitoring or wake-on-event systems. |
Pinout & Package
SC-88A (SOT-353) 5-pin surface-mount package: 1.25 mm × 1.25 mm footprint, 0.65 mm pitch, Pb-free, moisture sensitivity level 1 (MSL1). Exposed pad not present; thermal resistance RJA = 200 °C/W on 30 × 30 mm PCB (1 oz Cu).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Input power supply connection; max 13 V absolute rating, 7 V recommended operating limit. |
| 2 | GND | Power ground reference; must be low-impedance path to minimize noise coupling and ensure stability. |
| 3 | Enable | Active-high logic control; pull to Vin for always-on operation; tie low to disable and reduce quiescent current to 0.1 µA. |
| 4 | N/C | No internal connection; electrically isolated - must remain unconnected per datasheet. |
| 5 | Vout | Regulated 2.5 V output; requires ≥1.0 µF ceramic capacitor (X7R/Y5V) placed adjacent to pin for transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 39 µVRMS output noise without external bypass capacitor - eliminates need for secondary filtering in compact RF modules. |
| Fast enable response | 20 µs turn-on time from Enable high to 95% Vout - supports dynamic power sequencing in multi-rail systems. |
| Ceramic capacitor compatibility | Stable with ESR from few mΩ to 3 Ω - enables use of small, low-cost, high-reliability MLCCs instead of bulkier tantalum. |
| Integrated protection | Thermal shutdown at ~125 °C and current limiting (~100–250 mA short-circuit) - prevents damage during fault conditions without external components. |
| Pb-free & RoHS compliant | Meets JEDEC J-STD-020 MSL1 handling requirements - suitable for lead-free reflow assembly without moisture sensitivity concerns. |
Applications
| RF Handset Power Management | VCO/PLL Bias Supply |
|---|---|
Use Scenario: Powering RF transceiver LNA and mixer stages in 4G/5G mobile handsets where supply noise directly impacts EVM and ACLR. IC Role / Device Role / Timing Role: Low-noise post-regulator stepping down switched-mode converter output to clean 2.5 V rail for analog RF blocks. Use Value: 39 µVRMS noise and 70 dB ripple rejection prevent degradation of receiver sensitivity and transmit spectral purity. |
Use Scenario: Providing ultra-stable bias to voltage-controlled oscillators and phase-locked loops in wireless infrastructure and test equipment. IC Role / Device Role / Timing Role: Precision low-dropout regulator delivering fixed 2.5 V with minimal PSRR-induced jitter. Use Value: Tight ±2% output tolerance and low thermal drift (<±0.02%/°C typical) maintain oscillator center frequency accuracy across temperature. |
| Portable Sensor Signal Chain | Low-Power MCU I/O Rail |
Use Scenario: Supplying ADC reference buffers and op-amp front-ends in battery-powered environmental sensors (e.g., gas, humidity, IMU). IC Role / Device Role / Timing Role: Efficient, low-quiescent LDO generating clean 2.5 V from shared system rail to isolate analog signal path from digital switching noise. Use Value: 140 mV dropout enables >90% efficiency at light loads; 0.1 µA shutdown current extends shelf life in storage mode. |
Use Scenario: Powering I/O banks of ultra-low-power microcontrollers (e.g., ARM Cortex-M0+, RISC-V) requiring regulated 2.5 V for interface compatibility. IC Role / Device Role / Timing Role: Standby-capable LDO enabling selective peripheral power gating via Enable pin. Use Value: Logic-level Enable allows direct GPIO control; fast 20 µs turn-on supports sub-millisecond wake-up latency in duty-cycled applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2502E/TT | 250 mA output, 1.6 µA quiescent current, SOT-23-3 package (no Enable pin) | Lacks enable control and has higher noise (80 µVRMS) - unsuitable for RF/VCO use but better for higher-current digital loads. | Select when >50 mA load or simplified 3-pin layout is required; avoid where enable sequencing or ultra-low noise is critical. |
| TNIV5025002RA | 50 mA, 2.5 V, 45 µVRMS noise, 65 dB ripple rejection, SOT-23-5 with Enable | Slightly higher noise and lower PSRR than NCP508SQ25T1G; same SC-88A pinout but different marking and thermal performance (RJA = 220 °C/W). | Valid drop-in alternative only if 5 dB PSRR margin and 6 µVRMS noise increase are acceptable in target application. |
Compared with MCP1700T-2502E/TT and TNIV5025002RA, the NCP508SQ25T1G delivers superior noise and PSRR performance in the same SC-88A footprint - making it the preferred choice for RF and precision analog applications despite its discontinued status and tighter supply chain constraints.
Availability
NCP508SQ25T1G is available at Aetrix Electronics and suitable for RF handset design, VCO/PLL biasing, portable sensor signal chains, and low-power MCU I/O rail generation requiring stable component supply despite its discontinued status.
Supply support for NCP508SQ25T1G 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, sensing, and connectivity solutions for automotive, industrial, and cloud power markets.
The NCP508 series belongs to onsemi's precision low-noise LDO portfolio, engineered specifically for powering noise-sensitive RF and timing circuits in space-constrained portable electronics.
FAQ
What is the output voltage tolerance of the NCP508SQ25T1G over temperature?
The NCP508SQ25T1G has an output voltage tolerance of ±3% across the full operating ambient temperature range of −40 °C to +85 °C at 10 mA load. At 25 °C, the tolerance tightens to ±2%. This specification is confirmed in the Electrical Characteristics table on page 3 of the NCP508/D datasheet Rev. 6, ensuring predictable performance in thermally varying environments such as handheld devices and outdoor sensors.
Is the NCP508SQ25T1G still in active production?
No - the NCP508SQ25T1G is marked as discontinued in the official onsemi NCP508/D datasheet Rev. 6 (January 2026), page 13. However, Aetrix Electronics maintains legacy inventory and offers traceable, tested units with full documentation support for ongoing production and repair needs.
Can the NCP508SQ25T1G operate with a 1.0 µF ceramic output capacitor?
Yes - the NCP508SQ25T1G is explicitly designed for stability with 1.0 µF ceramic capacitors (X7R or Y5V dielectrics), as stated in the Applications Information section (page 12) and confirmed in Figure 1 and Table 1. It tolerates ESR values from a few milliohms up to 3 Ω, eliminating the need for larger or more expensive tantalum capacitors.
What is the maximum input voltage the NCP508SQ25T1G can handle?
The NCP508SQ25T1G has an absolute maximum input voltage rating of 13.0 V, but its recommended maximum operating input voltage is 7.0 V per the Recommended Operating Conditions table (page 2). Exceeding 7.0 V may increase dropout and thermal stress without improving functionality - especially critical given its SC-88A package's 200 °C/W thermal resistance.
Does the NCP508SQ25T1G include thermal shutdown protection?
Yes - the NCP508SQ25T1G incorporates internal thermal shutdown circuitry that activates at approximately 125 °C junction temperature, as defined in the Definitions section (page 12) and confirmed in the Maximum Ratings table (page 2). When triggered, the device disables output and remains off until junction temperature falls below the hysteresis threshold, protecting against sustained overload or poor PCB thermal design.
NCP508SQ25T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 2.5V
- 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:
- SC-88A (SC-70-5/SOT-353)
NCP508SQ25T1G FAQ
1.How can I place an order for NCP508SQ25T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP508SQ25T1G 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 NCP508SQ25T1G reliable?
The price and inventory of NCP508SQ25T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP508SQ25T1G is usually 5 days.
3.What payment methods are accepted for NCP508SQ25T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP508SQ25T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP508SQ25T1G?
NCP508SQ25T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP508SQ25T1G 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 NCP508SQ25T1G?
For technical support, including NCP508SQ25T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP508SQ25T1G requirements.
6.How does Aetrix verify that NCP508SQ25T1G is sourced from the original manufacturer or authorized distributors?
All NCP508SQ25T1G 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 NCP508SQ25T1G meets industry standards.
7.What is the process for return or replacement of NCP508SQ25T1G?
All NCP508SQ25T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP508SQ25T1G, 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 NCP508SQ25T1G part is unused and in its original packaging.
Return procedure for NCP508SQ25T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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