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onsemi NCP4625DSN18T1G
- Part No.:
- NCP4625DSN18T1G
- Manufacturer:
- onsemi
- Package:
- SC-74A, SOT-753
- Datasheet:
-
NCP4625DSN18T1G.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,532
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Product details
Overview
NCP4625DSN18T1G from onsemi is a 300 mA, 1.8 V fixed-output CMOS low-dropout linear regulator in SOT-23-5 package, operating from 2.6 V to 10 V input, with 200 mV dropout at 100 mA and ±1% output voltage accuracy over −40°C to +85°C - used for powering core logic and I/O rails in portable battery-powered devices.
For engineers reviewing the NCP4625DSN18T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its auto-discharge function (D-version), thermal shutdown at 165°C, 70 dB PSRR at 1 kHz, stable operation with 1 µF ceramic output capacitor, and enable-pin compatibility with 1.7 V logic-high threshold.
Technical Context
The NCP4625DSN18T1G implements a CMOS-based LDO architecture with internal N-channel pass transistor, enabling low quiescent current (23 µA) and fast transient response. Its integrated chip-enable circuit features an internal pull-down current source (0.3 µA) and logic-compatible CE threshold (1.7 V high, 0.8 V low).
This D-version includes an active output discharge transistor between VOUT and GND, activated during disable mode to rapidly deplete output capacitance - critical for sequencing-sensitive systems. Thermal shutdown (165°C trip, 110°C release) and current fold-back protection ensure robust fault handling without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±1% (25°C), ±2.3% over −40°C to +85°C - ensures stable core voltage for 1.8 V logic and memory interfaces. |
| Max Output Current | 300 mA continuous - supports moderate-power microcontrollers, sensors, and interface ICs without derating at ambient ≤60°C. |
| Dropout Voltage | 200 mV @ 100 mA, 770 mV @ 300 mA (VIN = 2.8 V) - enables regulation from two Li-ion cells (down to ~2.8 V) while maintaining 1.8 V output. |
| PSRR | 70 dB @ 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Quiescent Current | 23 µA typical - extends battery life in always-on or low-duty-cycle applications like remote sensors. |
| Enable Threshold | VCEH = 1.7 V, VCEL = 0.8 V - compatible with 1.8 V and 3.3 V GPIOs for precise power sequencing control. |
| Thermal Shutdown | 165°C trip temperature with 55°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
SOT-23-5 package (Case 1212), 2.7 mm × 2.5 mm footprint, 1.3 mm height, Pb-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.6–10 V input; requires 1 µF ceramic decoupling capacitor placed adjacent to pin for stability and line transient immunity. |
| GND | Power ground reference | Common return path for input/output currents; must be low-impedance and directly tied to power plane under IC for EMI control. |
| CE | Chip enable control input | Active-high logic input; internal 0.3 µA pull-down allows direct tie to VIN if enable function unused; enables system-level power gating. |
| VOUT | Regulated output terminal | Delivers 1.8 V ±1%; connects to 1 µF ceramic output capacitor; D-version includes internal discharge path to GND when CE = low. |
| NC | No-connect terminal | Internally unconnected; must remain floating - no routing or soldering permitted to avoid parasitic coupling or latch-up risk. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | D-version integrates dedicated VOUT-to-GND discharge transistor, reducing output decay time from >100 ms to <1 ms - essential for safe power-down sequencing in multi-rail systems. |
| Ceramic capacitor stability | Stable with ≥1 µF X5R/X7R ceramic output capacitor (ESR < 100 mΩ); eliminates need for higher-ESR tantalum or aluminum electrolytic capacitors. |
| Low temperature drift | ±80 ppm/°C output voltage coefficient - maintains tight regulation across industrial temperature range without calibration. |
| High line regulation | 0.02%/V typical - minimizes output variation during battery voltage sag or upstream converter ripple, critical for ADC reference and PLL supply rails. |
| Current fold-back protection | Reduces short-circuit current to ~40 mA at VOUT = 0 V - limits power dissipation during fault, enabling self-recovery without latch-up or external current limiting. |
Applications
| Portable Medical Sensors | Industrial IoT Edge Nodes |
|---|---|
|
Use Scenario: Wearable ECG sensor powered by single-cell Li-ion battery (3.0–4.2 V), requiring clean 1.8 V supply for analog front-end and BLE SoC. IC Role / Device Role / Timing Role: Primary voltage regulator delivering stable 1.8 V rail with ultra-low noise (85 µVrms) and fast load transient recovery (<50 µs). Use Value: Auto-discharge ensures rapid VOUT collapse during sleep mode entry, preventing back-powering of disabled peripherals and meeting UL/IEC 62368-1 isolation requirements. |
Use Scenario: Battery-backed programmable logic controller (PLC) module with real-time clock and RS-485 transceiver, operating from 3.6 V primary supply. IC Role / Device Role / Timing Role: Secondary LDO supplying 1.8 V to FPGA configuration memory and low-voltage I/O banks, with enable control synchronized to master reset. Use Value: 70 dB PSRR at 1 kHz rejects noise from 1 MHz DC/DC converter; thermal shutdown protects against enclosure overheating in sealed enclosures. |
| Smart Home Camera Modules | Automotive Body Control Subsystems |
|
Use Scenario: HD video camera using CMOS image sensor and video encoder IC, powered via USB PD (5 V) with local 1.8 V domain. IC Role / Device Role / Timing Role: Local point-of-load regulator for image sensor digital core, featuring fast startup (<100 µs) and low quiescent current for standby mode. Use Value: 23 µA IQ enables >1-year battery life in motion-triggered recording; SC-70/SOT-23 footprints support compact 2-layer PCB layout. |
Use Scenario: Door module with LIN transceiver and LED driver, supplied from vehicle battery (9–16 V) through pre-regulator, requiring isolated 1.8 V for microcontroller I/O. IC Role / Device Role / Timing Role: Post-regulator providing noise-isolated 1.8 V for MCU GPIO and CAN transceiver logic, with CE pin controlled by system supervisor IC. Use Value: Absolute max input rating of 12 V withstands load-dump transients up to 100 ms; AEC-Q100 stress-tested ESD performance (2 kV HBM) meets automotive robustness requirements. |
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 | 250 mA max output, no enable pin, no auto-discharge, 6 µA IQ | Lacks CE control and output discharge - unsuitable for sequenced power-down or hot-swap systems | Select only for ultra-low-IQ, non-sequencing applications where 300 mA headroom is not required. |
| Torex XC6206P182MR-G | 300 mA output, no enable pin, no auto-discharge, 1 µF min COUT, 15 µA IQ | Fixed 1.8 V, but lacks CE and discharge - requires external MOSFET for sequencing and discharge | Choose when board space permits discrete discharge circuit and enable logic is handled externally. |
Compared with MCP1700T-1802E/TT and XC6206P182MR-G, the NCP4625DSN18T1G uniquely integrates both enable control and auto-discharge in a 5-pin SOT-23, eliminating external components for power sequencing while maintaining 300 mA capability and industrial-grade thermal protection.
Availability
NCP4625DSN18T1G is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, smart home camera modules, and automotive body control subsystems requiring stable component supply with guaranteed long-term sourcing.
Supply support for NCP4625DSN18T1G 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 NCP4625DSN18T1G belongs to the NCP4625 family of CMOS LDO regulators designed specifically for space-constrained, battery-powered applications demanding low IQ, fast transient response, and integrated power-control features like enable and auto-discharge.
FAQ
What is the maximum input voltage rating for the NCP4625DSN18T1G?
The NCP4625DSN18T1G has an absolute maximum input voltage rating of 12.0 V. Operation above this level risks permanent damage. For reliable continuous operation, the recommended input range is 2.6 V to 10.0 V - sufficient to support two-series Li-ion batteries (nominal 7.4 V, fully charged 8.4 V) with margin for ripple and transient overshoot. The NCP4625DSN18T1G maintains regulation down to 2.8 V input at full 300 mA load.
Does the NCP4625DSN18T1G require an external capacitor on the CE pin?
No, the NCP4625DSN18T1G does not require an external capacitor on the CE pin. Its enable input includes an internal pull-down current source (0.3 µA) and is designed for direct connection to a logic-level GPIO or to VIN if enable functionality is unused. Adding capacitance to CE would slow turn-on/turn-off timing and is unnecessary for noise immunity - the device's CE threshold (1.7 V high, 0.8 V low) provides adequate hysteresis for robust digital control. This behavior is confirmed in the NCP4625DSN18T1G datasheet Figure 35–40 startup/shutdown waveforms.
How does the auto-discharge feature work in the NCP4625DSN18T1G?
The NCP4625DSN18T1G (D-version) integrates an internal NMOS transistor between VOUT and GND that activates automatically when the CE pin is driven low. This discharges the output capacitor rapidly - reducing VOUT decay time from >100 ms (with passive RC decay) to under 1 ms - ensuring fast, controlled power-down in multi-rail systems. The discharge path is active only during disable mode and draws no current during normal regulation. This eliminates the need for external bleed resistors or MOSFETs, saving board space and improving reliability. The NCP4625DSN18T1G datasheet confirms this function in Application Information section "Output Discharger".
Can the NCP4625DSN18T1G operate stably with a 0.47 µF ceramic output capacitor?
Yes, the NCP4625DSN18T1G is specified to operate stably with a minimum 0.47 µF ceramic output capacitor, as verified in the Electrical Characteristics table (test condition: COUT = 0.47 µF). However, the recommended value is 1.0 µF X5R/X7R ceramic for optimal transient response and PSRR performance across temperature and voltage. Using 0.47 µF may marginally reduce load transient recovery speed and increase output ripple under dynamic loads, but will not cause oscillation. The NCP4625DSN18T1G's internal compensation is optimized for ceramic capacitors with ESR < 100 mΩ.
What is the thermal resistance (RJA) of the NCP4625DSN18T1G in its SOT-23 package?
The NCP4625DSN18T1G in SOT-23-5 package (Case 1212) has a junction-to-air thermal resistance (RJA) of 238°C/W, as specified in the Thermal Characteristics table on page 3 of the datasheet. This value assumes standard JEDEC 2S2P test board conditions. Actual RJA can improve significantly with PCB copper pour under the exposed pad (if present) or thermal vias - though the SOT-23-5 variant lacks an exposed thermal pad. For 300 mA load at 10 V input, power dissipation reaches ~2.5 W; thus, proper board layout is essential to keep junction temperature below 150°C maximum rating. The NCP4625DSN18T1G includes thermal shutdown at 165°C as a safety backup.
NCP4625DSN18T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 40 µA
- Current - Supply (Max):
- -
- 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:
- SOT-23-5
NCP4625DSN18T1G FAQ
1.How can I place an order for NCP4625DSN18T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4625DSN18T1G 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 NCP4625DSN18T1G reliable?
The price and inventory of NCP4625DSN18T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4625DSN18T1G is usually 5 days.
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Once your NCP4625DSN18T1G 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 NCP4625DSN18T1G?
For technical support, including NCP4625DSN18T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4625DSN18T1G requirements.
6.How does Aetrix verify that NCP4625DSN18T1G is sourced from the original manufacturer or authorized distributors?
All NCP4625DSN18T1G 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 NCP4625DSN18T1G meets industry standards.
7.What is the process for return or replacement of NCP4625DSN18T1G?
All NCP4625DSN18T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP4625DSN18T1G, 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 NCP4625DSN18T1G part is unused and in its original packaging.
Return procedure for NCP4625DSN18T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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