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onsemi NCP703SN35T1G
- Part No.:
- NCP703SN35T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP703SN35T1G.pdf
- Description:
- IC REG LINEAR 3.5V 300MA 6TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,668
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Product details
Overview
NCP703SN35T1G from onsemi is a 300 mA ultra-low-noise, ultra-low-quiescent-current LDO voltage regulator delivering fixed 3.5 V output with ±2% accuracy, 180 mV typical dropout at full load, 13 µVRMS noise (100 Hz–100 kHz), and 68 dB PSRR at 1 kHz-designed for powering RF power amplifiers in satellite radios and precision analog circuitry in portable medical devices.
For engineers reviewing the NCP703SN35T1G datasheet, pinout, applications, or equivalent options, key selection criteria include quiescent current (12 µA typ.), noise performance without external bypass capacitors, EN-controlled active discharge, thermal shutdown (160°C), and compatibility with 1 µF ceramic output capacitance.
Technical Context
The NCP703SN35T1G employs a PMOS pass transistor architecture enabling low dropout and inherent reverse-current protection, coupled with adaptive ground current management to maintain 12 µA quiescent current across light-load conditions. Its internal soft-start limits inrush current during enable transitions.
It integrates undervoltage lockout (UVLO) with 100 mV hysteresis (1.6 V turn-on), precise bandgap reference, and logic-level enable input (0.9 V high threshold, 0.4 V low threshold) with 110 nA internal pull-down-ensuring robust startup and shutdown behavior in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.5 V ±2% over load/line/temperature - ensures stable biasing for sensitive RF front-ends without external feedback. |
| Quiescent Current | 12 µA typical at no load - extends battery life in always-on portable instrumentation and IoT edge sensors. |
| Output Noise | 13 µVRMS (100 Hz–100 kHz) - eliminates need for external noise-bypass capacitor, reducing BOM count and PCB area. |
| Dropout Voltage | 180 mV typical at 300 mA - enables operation from single-cell Li-ion (3.0 V min) while maintaining regulation at full load. |
| PSRR | 68 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding RF signal chains. |
| Enable Threshold | 0.9 V (high), 0.4 V (low) - compatible with 1.8 V and 3.3 V GPIOs; 2 mV hysteresis prevents oscillation near threshold. |
| Thermal Shutdown | 160°C activation with 20°C hysteresis - protects against sustained overload or poor heatsinking in compact enclosures. |
Pinout & Package
Package: TSOP−5 (Case 483), 3.00 × 1.50 × 0.95 mm, Pb-free, surface-mount. Thermal resistance: θJA = 241°C/W (1 oz FR4, 645 mm² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply connection | Accepts 2.0–5.5 V input; requires ≥1 µF ceramic capacitor to GND for stability and noise filtering. |
| 2 (EN) | Logic-enable control input | Drives high (>0.9 V) to activate regulator; low (<0.4 V) disables output and engages active discharge (320 Ω to GND). |
| 3 (N/C) | No-connect terminal | Internally unconnected; must be left floating or tied to GND only for thermal enhancement (not electrical function). |
| 4 (GND) | Power ground reference | Die ground connected via lead frame; soldered to large copper plane for optimal thermal dissipation and low-impedance return path. |
| 5 (OUT) | Regulated output voltage | Delivers 3.5 V ±2%; stable with ≥1 µF X5R/X7R ceramic capacitor; supports up to 300 mA continuous load. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise without CNR | 13 µVRMS noise achieved with only 1 µF COUT, eliminating dedicated noise-bypass capacitor and associated layout complexity. |
| Active output discharge | 320 Ω internal discharge path pulls VOUT to GND within milliseconds after EN deactivation-critical for fast power sequencing in multi-rail systems. |
| Dynamic IQ management | Adaptive ground current reduces IQ to 12 µA at zero load while preserving transient response-ideal for intermittent-sensing applications. |
| Stable with minimal capacitance | Guaranteed stability with 0.1 µF effective COUT, accommodating DC-bias derating of small-case ceramics (e.g., 0402 1 µF). |
| Robust protection suite | Integrated thermal shutdown (160°C), current limit (~490 mA), short-circuit protection, and UVLO prevent damage under fault conditions without external components. |
Applications
| Satellite Radio Power Amplifier | Portable Medical Sensor Node |
|---|---|
Use Scenario: Powering GaAs or GaN RF power amplifier stages in handheld satellite radio receivers where supply ripple directly modulates output spectrum. IC Role / Device Role / Timing Role: Clean 3.5 V bias rail generator with ultra-low noise and high PSRR to minimize AM-to-PM conversion and adjacent-channel interference. Use Value: 13 µVRMS noise and 68 dB PSRR at 1 kHz eliminate need for additional LC filtering, reducing solution size by >30% versus legacy LDOs requiring CNR. | Use Scenario: Supplying analog front-end (AFE) and ADC in battery-powered ECG or pulse oximetry modules requiring sub-µV noise floor and long operational life. IC Role / Device Role / Timing Role: Precision voltage reference source with ±2% accuracy and <20 µVRMS noise across temperature, ensuring measurement repeatability. Use Value: 12 µA quiescent current extends 200 mAh coin-cell battery life to >5 years in sleep mode, while 180 mV dropout enables use down to 3.0 V battery voltage. |
| Infotainment System Audio Codec | Bluetooth LE Wireless Handset |
Use Scenario: Providing clean 3.5 V supply to high-resolution audio DACs and headphone amplifiers in automotive infotainment head units. IC Role / Device Role / Timing Role: Low-noise post-regulator decoupling LDO isolating sensitive analog audio paths from noisy digital power domains. Use Value: 68 dB PSRR at 1 kHz rejects ripple from 1 MHz buck converters, preventing audible beat tones and improving SNR by ≥3 dB. | Use Scenario: Powering Bluetooth 5.0 SoC RF transceivers and baseband processors in compact wireless earbuds with strict thermal and space constraints. IC Role / Device Role / Timing Role: Primary system LDO with enable control for dynamic power gating of RF subsystem during idle periods. Use Value: Active discharge ensures rapid VOUT decay (<5 ms) upon disable, meeting Bluetooth LE fast wake-up timing requirements and preventing leakage into powered-down blocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A2035PDQNR | 350 mA output, 6.5 µA IQ, 12 µVRMS noise, but requires 2.2 µF minimum COUT; no active discharge. | Lacks active discharge and has higher minimum COUT requirement-unsuitable for fast power sequencing or space-constrained designs needing 1 µF stability. | Select when lowest possible IQ is critical and active discharge is unnecessary; verify COUT footprint fits layout. |
| MCP1703-3502E/MB | 250 mA output, 2 µA IQ, 30 µVRMS noise, no EN pin, no active discharge, 600 mV dropout at full load. | Higher noise and dropout, no enable control-limited to always-on, non-sequenced, low-current applications like microcontroller core rails. | Choose only for ultra-low-IQ standby scenarios where noise and dynamic performance are secondary; not suitable for RF or precision analog. |
Compared with TPS7A2035PDQNR and MCP1703-3502E/MB, the NCP703SN35T1G uniquely combines 300 mA capability, 12 µA IQ, 13 µVRMS noise with 1 µF stability, and integrated active discharge-making it the only option among the three qualified for RF power amplifier biasing with fast power cycling.
Availability
NCP703SN35T1G is available at Aetrix Electronics and suitable for satellite radio front-ends, portable medical sensor nodes, and Bluetooth LE wireless handsets requiring stable component supply, long-term lifecycle support, and guaranteed Pb-free compliance.
Supply support for NCP703SN35T1G 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, and sensor solutions for automotive, industrial, and portable electronics.
The NCP703 series is designed specifically for noise-sensitive, battery-powered applications-including RF power amplifiers, precision instrumentation, and portable medical devices-where ultra-low quiescent current and ultra-low noise are mandatory.
FAQ
What is the maximum input voltage rating for the NCP703SN35T1G?
The NCP703SN35T1G has an absolute maximum input voltage rating of 6 V. Operation above this level risks permanent device damage. The recommended operating input voltage range is 2.0 V to 5.5 V, which ensures proper regulation, thermal stability, and specification compliance across temperature. For 3.5 V output, minimum VIN is 3.68 V (3.5 V + 180 mV dropout) under full 300 mA load.
Does the NCP703SN35T1G require an external noise-bypass capacitor?
No, the NCP703SN35T1G does not require an external noise-bypass capacitor. Its internal design achieves 13 µVRMS output noise (100 Hz–100 kHz) with only a 1 µF ceramic output capacitor. This eliminates the need for a second capacitor (CNR) typically used in older LDOs, simplifying layout and reducing bill-of-materials cost without compromising noise performance.
What is the purpose of the N/C pin (Pin 3) on the NCP703SN35T1G TSOP−5 package?
The N/C pin (Pin 3) on the NCP703SN35T1G TSOP−5 package is internally not connected. It may be left floating or tied to ground solely to improve thermal conduction from the die to the PCB copper plane. It serves no electrical function-no signal, bias, or reference role-and must never be connected to any active node or voltage rail.
How does the active discharge feature work on the NCP703SN35T1G?
When the EN pin voltage falls below 0.4 V, the NCP703SN35T1G disables its pass transistor and activates an internal 320 Ω discharge path from OUT to GND. This pulls the output voltage to ground within milliseconds, ensuring rapid power-down of downstream circuitry. Discharge current is limited to ~11 mA at 3.5 V, preventing excessive stress on the IC or PCB traces.
Can the NCP703SN35T1G operate with a 0.1 µF output capacitor?
Yes-the NCP703SN35T1G is specified to remain stable with a minimum effective output capacitance of 0.1 µF, accounting for DC-bias and temperature derating of ceramic capacitors. While 1 µF is recommended for optimal transient response and PSRR, a properly selected 0402 1 µF X7R capacitor (which retains ~0.15 µF at 3.5 V bias) meets the stability requirement and enables ultra-compact designs.
NCP703SN35T1G 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):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 20 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Soft Start, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCP703SN35T1G FAQ
1.How can I place an order for NCP703SN35T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP703SN35T1G 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 NCP703SN35T1G reliable?
The price and inventory of NCP703SN35T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP703SN35T1G is usually 5 days.
3.What payment methods are accepted for NCP703SN35T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP703SN35T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP703SN35T1G?
NCP703SN35T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP703SN35T1G 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 NCP703SN35T1G?
For technical support, including NCP703SN35T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP703SN35T1G requirements.
6.How does Aetrix verify that NCP703SN35T1G is sourced from the original manufacturer or authorized distributors?
All NCP703SN35T1G 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 NCP703SN35T1G meets industry standards.
7.What is the process for return or replacement of NCP703SN35T1G?
All NCP703SN35T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP703SN35T1G, 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 NCP703SN35T1G part is unused and in its original packaging.
Return procedure for NCP703SN35T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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