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onsemi NCP603SN350T1G
- Part No.:
- NCP603SN350T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP603SN350T1G.pdf
- Description:
- IC REG LINEAR 3.5V 300MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,371
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Product details
Overview
NCP603SN350T1G from onsemi is a fixed-output 3.5 V, 300 mA low-dropout (LDO) linear regulator in TSOP-5 package, designed for portable battery-powered systems requiring low noise (50 µVrms), fast enable response (15 µs), and high PSRR (62 dB at 120 Hz). It delivers stable regulation across −40 °C to +125 °C with ±2% output tolerance and supports SMPS post-regulation and RF-sensitive analog circuits.
For engineers reviewing the NCP603SN350T1G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, validated pin functions, confirmed operating ranges, and real-world design implications - including dropout behavior at 300 mA, thermal shutdown at 175 °C, and ESD robustness (HBM 3.5 kV).
Technical Context
The NCP603SN350T1G integrates a PMOS pass transistor enabling ultra-low dropout (75 mV typical at 150 mA, 157 mV at 300 mA for 3.5 V output), internal current limiting (650 mA typical), and thermal shutdown (175 °C with 10 °C hysteresis). Its enable input features logic-compatible thresholds (0.9 V high, 0.4 V low) and sub-100 nA bias current.
Designed for ceramic capacitor stability, it requires no minimum ESR and operates with 1.0 µF input/output capacitance. The device achieves 50 µVrms output noise (10 Hz–100 kHz) without bypass capacitors and maintains ±2% line/load regulation over full temperature and load range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.5 V ±2% (1.0–300 mA load, −40 °C to +125 °C) |
| Max Output Current | 300 mA continuous; current limit trips at 650 mA typical |
| Dropout Voltage | 75 mV typ @ 150 mA; 157 mV typ @ 300 mA (VOUT = 3.5 V) |
| Noise Voltage | 50 µVrms (10 Hz–100 kHz, no bypass capacitor required) |
| PSRR | 62 dB @ 120 Hz, 55 dB @ 1 kHz, 38 dB @ 10 kHz |
| Enable Threshold | Logic-high ≥0.9 V; logic-low ≤0.4 V; bias current ≤100 nA |
| Thermal Shutdown | Activates at 175 °C with 10 °C hysteresis; disables output until cooldown |
Pinout & Package
TSOP-5 (Case 483, 3.00 × 1.50 × 0.95 mm, 0.95 mm pitch, Pb-free) with exposed pad not electrically connected. Pin 1 = VIN, Pin 2 = GND, Pin 3 = ENABLE, Pin 4 = NC (no connection - fixed-voltage version), Pin 5 = VOUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive power supply input | Accepts 1.75–6.0 V; must be decoupled with ≥1.0 µF ceramic capacitor near pin |
| 2 - GND | Power ground and substrate reference | Low-impedance return path; connects to PCB ground plane for thermal and noise control |
| 3 - ENABLE | Digital control input for regulator activation | Pull ≥0.9 V to enable; ≤0.4 V to disable (standby current ≤1.0 µA); tie to VIN if unused |
| 4 - NC | No connection (fixed-voltage variant) | Not bonded internally; PCB trace may be omitted or left floating; no electrical function |
| 5 - VOUT | Regulated 3.5 V output | Supplies load up to 300 mA; requires ≥1.0 µF ceramic output capacitor; stable with zero ESR |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 50 µVrms output noise without external bypass capacitor - critical for VCO/RF stage power |
| Fast enable response | 15 µs turn-on time enables precise power sequencing in multi-rail portable systems |
| Enhanced ESD protection | HBM 3.5 kV / MM 200 V - exceeds AEC-Q100 stress requirements for handheld environments |
| Ceramic-capacitor optimized | Stable with 1.0 µF ceramic output cap and zero minimum ESR - reduces BOM cost and board area |
| Thermal and current fault protection | Integrated thermal shutdown (175 °C) and current limit (650 mA) prevent damage during overload or poor heatsinking |
Applications
| SMPS Post-Regulation | Noise-Sensitive RF Circuits |
|---|---|
|
Use Scenario: Clean 3.5 V rail derived from a switching converter for mixed-signal SoC core logic. IC Role / Device Role / Timing Role: Final-stage LDO providing ripple-suppressed, low-noise supply to voltage-sensitive digital blocks. Use Value: 62 dB PSRR at 120 Hz attenuates SMPS fundamental ripple; 50 µVrms noise prevents clock jitter in PLLs. |
Use Scenario: Powering VCO bias and low-noise amplifier (LNA) stages in 2.4 GHz Wi-Fi front-end modules. IC Role / Device Role / Timing Role: Ultra-low-noise local regulator isolating RF analog circuitry from noisy system rails. Use Value: No external bypass needed; 157 mV dropout at 300 mA allows operation from single-cell Li-ion (3.0–4.2 V). |
| Portable Audio Players | Camcorders & Digital Cameras |
|
Use Scenario: Supplying DAC, headphone amp, and codec I/O interfaces in battery-powered audio devices. IC Role / Device Role / Timing Role: Low-quiescent, fast-enabling regulator supporting dynamic power management during playback/pause transitions. Use Value: 15 µs enable time synchronizes with audio subsystem wake-up; ±2% tolerance ensures consistent DAC reference accuracy. |
Use Scenario: Providing stable 3.5 V to image sensor interface, ISP core, and auto-focus motor drivers in compact imaging modules. IC Role / Device Role / Timing Role: High-reliability LDO with thermal shutdown protecting against lens-motor stall-induced overheating. Use Value: 175 °C thermal cutoff prevents permanent damage during extended video capture; TSOP-5 footprint saves space in tight camera modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3502E/TO | 300 mA max, 3.5 V fixed, SOT-23-5 package; higher dropout (250 mV @ 250 mA); no enable pin | Lacks enable control and thermal shutdown; suitable only for always-on, non-sequenced rails | Select only if enable functionality and thermal protection are unnecessary and layout allows larger dropout margin. |
| Torex XC6206P352MR-G | 300 mA max, 3.5 V fixed, SOT-25 package; 120 mV dropout @ 100 mA; 30 µVrms noise; no thermal shutdown | Lower noise but no overtemperature protection; different pinout (ENABLE on Pin 4 vs. Pin 3) | Prefer for ultra-low-noise priority where thermal risk is mitigated externally; verify PCB layout compatibility. |
Compared with MCP1700-3502E/TO and XC6206P352MR-G, the NCP603SN350T1G uniquely combines enable control, thermal shutdown, and 75 mV dropout in a TSOP-5 package - making it optimal for thermally constrained, sequenced portable designs where reliability and efficiency are co-prioritized.
Availability
NCP603SN350T1G is available at Aetrix Electronics and suitable for portable computing, camcorder power management, and RF subsystem regulation requiring stable component supply despite its discontinued status - inventory is secured through legacy channel sourcing with full traceability.
Supply support for NCP603SN350T1G 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, analog, sensor, and connectivity solutions for automotive, industrial, and portable electronics.
The NCP603 series was engineered specifically for battery-powered portable devices demanding ultra-low noise, fast enable, and robust thermal/ESD performance - targeting audio, imaging, and RF subsystems where clean, responsive, and reliable regulation is non-negotiable.
FAQ
What is the output voltage tolerance of the NCP603SN350T1G over temperature and load?
The NCP603SN350T1G delivers 3.5 V output with ±2% tolerance across −40 °C to +125 °C ambient temperature and 1.0 mA to 300 mA load current, as specified in the Electrical Characteristics table for fixed-voltage versions. This tolerance holds under all recommended operating conditions without requiring external trimming.
Does the NCP603SN350T1G require an external bypass capacitor for low-noise operation?
No - the NCP603SN350T1G achieves 50 µVrms output noise (10 Hz–100 kHz) without any external bypass capacitor. Its internal architecture eliminates the need for a noise-reduction capacitor, unlike many competing LDOs, while maintaining 15 µs startup time.
What is the maximum dropout voltage of the NCP603SN350T1G at full 300 mA load?
At 300 mA output current and 3.5 V nominal output, the NCP603SN350T1G exhibits a maximum dropout voltage of 230 mV (measured at VOUT – 2.0%), with typical performance at 157 mV. This enables operation from as low as 3.73 V input across temperature and process variation.
Is the NCP603SN350T1G still in active production?
No - per onsemi's official datasheet revision 4 (February 2026), the NCP603SN350T1G is marked as discontinued. However, Aetrix Electronics maintains secured legacy inventory with full traceability and supports long-term design continuity for existing platforms.
How does the enable pin function on the NCP603SN350T1G, and what happens when it's unconnected?
The ENABLE pin (Pin 3) activates the regulator when pulled ≥0.9 V and disables it below 0.4 V. If left unconnected, the pin floats near threshold and risks erratic behavior; the datasheet explicitly recommends tying ENABLE to VIN if unused to guarantee reliable operation and activate the overshoot clamp circuit.
NCP603SN350T1G 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):
- 6V
- Voltage - Output (Min/Fixed):
- 3.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.23V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- -
- PSRR:
- 62dB ~ 38dB (120Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Transient Voltage
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCP603SN350T1G FAQ
1.How can I place an order for NCP603SN350T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP603SN350T1G 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 NCP603SN350T1G reliable?
The price and inventory of NCP603SN350T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP603SN350T1G is usually 5 days.
3.What payment methods are accepted for NCP603SN350T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP603SN350T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP603SN350T1G?
NCP603SN350T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP603SN350T1G 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 NCP603SN350T1G?
For technical support, including NCP603SN350T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP603SN350T1G requirements.
6.How does Aetrix verify that NCP603SN350T1G is sourced from the original manufacturer or authorized distributors?
All NCP603SN350T1G 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 NCP603SN350T1G meets industry standards.
7.What is the process for return or replacement of NCP603SN350T1G?
All NCP603SN350T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP603SN350T1G, 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 NCP603SN350T1G part is unused and in its original packaging.
Return procedure for NCP603SN350T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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