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onsemi NCP103AMX345TCG
- Part No.:
- NCP103AMX345TCG
- Manufacturer:
- onsemi
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
NCP103AMX345TCG.pdf
- Description:
- IC REG LINEAR 3.45V 150MA 4UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,676
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Product details
Overview
NCP103AMX345TCG from onsemi is a 150 mA CMOS low-dropout linear regulator with fixed 3.45 V output, ultra-low quiescent current (50 µA typ.), 75 mV typical dropout at full load, ±1% output accuracy, and integrated active output discharge. It operates from 1.7 V to 5.5 V input and delivers stable, low-noise power for space-constrained, battery-sensitive applications such as GPS modules and Bluetooth transceivers.
For engineers reviewing the NCP103AMX345TCG datasheet, pinout, applications, or equivalent options, this page provides verified technical context, package mapping, real-world transient performance data, thermal shutdown behavior, and validated alternative options - all specific to the NCP103AMX345TCG variant with active discharge and 3.45 V output.
Technical Context
The NCP103AMX345TCG employs a PMOS pass transistor architecture enabling low dropout and inherent reverse-current blocking. Its dynamic quiescent current adjustment reduces IQ to 50 µA at no-load while maintaining regulation under 150 mA load, and its internal bandgap reference ensures ±1% output accuracy across −40°C to +85°C.
It integrates thermal shutdown (160°C trip, 20°C hysteresis), current limiting (550 mA typ.), and an active output discharge path (100 Ω) activated during EN deassertion - a feature exclusive to "A"-suffix variants like NCP103AMX345TCG and absent in "B"-suffix parts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.45 V - precisely trimmed and stable over temperature; eliminates external feedback network and saves PCB area. |
| Max Output Current | 150 mA continuous - sufficient for powering RF front-ends, microcontroller I/O rails, or sensor signal chains without thermal derating in standard layouts. |
| Dropout Voltage | 72 mV typical at 150 mA (VOUT = 3.0 V); for 3.45 V output, dropout remains ≤120 mV - enables operation down to VIN = 3.57 V under full load. |
| Quiescent Current | 50 µA typical at no load - extends battery life in always-on IoT nodes; drops to 0.1 µA in shutdown mode. |
| PSRR | 75 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters, critical for ADC reference or RF synthesizer supply rails. |
| Output Noise | 76.77 µVrms (10 Hz–100 kHz, VOUT = 2.8 V, IOUT = 150 mA); for 3.45 V, noise remains sub-80 µVrms - suitable for noise-sensitive analog circuits. |
| Enable Threshold | VEN_HI = 0.9 V, VEN_LO = 0.4 V - compatible with 1.8 V and 3.3 V logic; internal 300 nA pull-down ensures default-off state if EN is floating. |
Pinout & Package
Package: uDFN4 1.0 × 1.0 mm, 0.65 mm pitch, exposed pad (Case 517CU). Thermal resistance RJA = 170°C/W on 1 oz FR-4 with 645 mm² copper area. Exposed pad must be soldered directly to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Regulated output voltage node | Connect ≥1 µF ceramic capacitor (X5R/X7R) directly to GND; minimum effective capacitance 0.22 µF required for stability. |
| 2: GND | Power ground reference | Return path for load current and internal bias; tie exposed pad directly to this pin via low-inductance connection. |
| 3: EN | Logic-controlled enable input | Drive >0.9 V to enable regulator; <0.4 V forces shutdown and activates 100 Ω active discharge to clear VOUT. |
| 4: IN | Input voltage supply | Accepts 1.7–5.5 V; requires local 1 µF ceramic decoupling to suppress high-frequency noise and trace inductance effects. |
Key Features
| Feature | Design Value |
|---|---|
| Active Output Discharge | Integrated 100 Ω discharge path pulls VOUT to GND within milliseconds of EN deassertion - prevents back-powering or latch-up in multi-rail systems. |
| Ultra-Low IQ Optimization | Dynamic quiescent current scaling maintains 50 µA IQ at no load and increases only modestly under load - maximizes standby time in battery-gated applications. |
| Stable with Small Ceramic Cap | Guaranteed stability with 1 µF X7R/X5R MLCC (0402 or larger); eliminates need for tantalum or large electrolytics, reducing BOM cost and footprint. |
| Robust Protection Suite | Thermal shutdown (160°C), current limit (550 mA typ.), and short-circuit immunity - enables unattended operation in sealed enclosures without external supervision. |
| High PSRR at Low Frequency | 75 dB rejection at 1 kHz - effectively isolates sensitive analog circuitry from ripple generated by buck converters operating at ~500 kHz–2 MHz. |
Applications
| GPS Receiver Module | Bluetooth LE Audio Transceiver |
|---|---|
|
Use Scenario: Powering GNSS baseband IC and LNA in compact wearable GPS trackers with coin-cell or Li-ion backup. IC Role / Device Role / Timing Role: Primary 3.45 V supply rail for RF front-end and digital baseband - replaces discrete regulators requiring external discharge resistors. Use Value: Active discharge clears residual charge before sleep mode, preventing false wake-ups; 50 µA IQ extends battery runtime beyond 6 months in periodic fix mode. |
Use Scenario: Supplying 3.45 V to Bluetooth 5.3 audio SoC (e.g., Nordic nRF52840) in true wireless stereo earbuds. IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO for digital core and radio section - synchronized with EN pin to match host MCU power states. Use Value: 75 dB PSRR suppresses switching noise from companion buck converter; 40 µs turn-on time meets Bluetooth LE advertising interval timing constraints. |
| Portable Medical Pulse Oximeter | Industrial Wireless Sensor Node |
|
Use Scenario: Delivering clean 3.45 V to optical sensor driver and ADC in Class II medical-grade pulse oximeters. IC Role / Device Role / Timing Role: Precision analog supply rail - regulated output accuracy (±1%) ensures consistent LED current and ADC reference stability. Use Value: Sub-80 µVrms output noise avoids SNR degradation in 24-bit delta-sigma ADC; thermal shutdown protects against enclosure overheating during extended use. |
Use Scenario: Powering LoRaWAN end-node MCU and SX1276 transceiver in battery-operated environmental monitoring nodes. IC Role / Device Role / Timing Role: Standby-optimized LDO for intermittent transmit/receive cycles - EN pin controlled by MCU GPIO to gate power during deep-sleep. Use Value: 0.1 µA shutdown current minimizes annual self-discharge; 150 mA capability supports peak TX current bursts without brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/MB | 3.3 V fixed output; no active discharge; 2.3 µA IQ; 600 mV dropout at 250 mA. | Lacks active discharge and tighter accuracy (±2%); higher dropout limits use below 3.9 V input. | Select when lowest possible IQ dominates and discharge is handled externally; verify dropout margin at max load. |
| Torex XC6219B345MR-G | 3.45 V fixed output; 1 µA IQ; no active discharge; 120 mV dropout at 150 mA; requires 1.0 µF ceramic cap. | Matches output voltage but omits active discharge and has lower PSRR (65 dB @ 1 kHz); rated for 150 mA with tighter thermal limits. | Use where ultra-low IQ is critical and system-level discharge is implemented; confirm thermal margin with RJA = 220°C/W. |
Compared with MCP1700T-3302E/MB and XC6219B345MR-G, the NCP103AMX345TCG uniquely combines matched 3.45 V output, active discharge, 75 dB PSRR, and 50 µA IQ - making it optimal for noise-sensitive, fast-state-switching battery systems where rail cleanup and interference suppression are non-negotiable.
Availability
NCP103AMX345TCG is available at Aetrix Electronics and suitable for GPS receivers, Bluetooth LE audio devices, portable medical sensors, and industrial wireless nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP103AMX345TCG 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, medical, and IoT applications.
The NCP103AMX345TCG belongs to onsemi's precision LDO family designed specifically for ultra-low-power, noise-critical portable electronics - emphasizing dynamic IQ optimization, robust protection, and minimal external component count.
FAQ
What is the output voltage tolerance of the NCP103AMX345TCG over temperature?
The NCP103AMX345TCG maintains ±1% output voltage accuracy across −40°C to +85°C junction temperature. This is specified in the Electrical Characteristics table (page 3 of the datasheet) under "Output Voltage Accuracy" for VOUT > 2.0 V, confirming tight regulation without external trimming or calibration needed in production.
Does the NCP103AMX345TCG include active output discharge, and how does it behave?
Yes, the NCP103AMX345TCG includes active output discharge - a feature exclusive to "A"-suffix variants. When EN falls below 0.4 V, an internal 100 Ω transistor pulls VOUT to GND, discharging the output capacitor rapidly. This is confirmed in the Pin Function Description (page 2) and Applications Information (page 12), and distinguishes it from "B"-suffix parts like NCP103BMX345TCG.
What is the minimum output capacitance required for stability with the NCP103AMX345TCG?
The NCP103AMX345TCG is stable with a minimum effective output capacitance of 0.22 µF (X5R/X7R ceramic), though 1 µF is recommended. This is stated in the Applications Information section (page 12) and validated across temperature, DC bias, and package size - ensuring reliability even with small 0402 capacitors.
Can the NCP103AMX345TCG operate from a 3.6 V lithium-ion battery throughout its discharge curve?
Yes. With a typical dropout of ≤120 mV at 150 mA and 3.45 V output, the NCP103AMX345TCG regulates down to VIN ≈ 3.57 V. Since a single Li-ion cell discharges from 4.2 V to 3.0 V, the device supports full regulation until ~3.57 V, after which it enters dropout - a behavior explicitly characterized in Figure 12 (Dropout vs. Output Current).
Is the NCP103AMX345TCG RoHS-compliant and lead-free?
Yes, the NCP103AMX345TCG is Pb-free, halogen-free/BFR-free, and RoHS-compliant, as stated in the Features list (page 1) and Ordering Information (page 13). The "G" suffix in the part number denotes RoHS compliance per onsemi's packaging standards.
NCP103AMX345TCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-UDFN Exposed Pad
- 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):
- 3.45V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 95 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-UDFN (1.0x1.0)
NCP103AMX345TCG FAQ
1.How can I place an order for NCP103AMX345TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP103AMX345TCG 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 NCP103AMX345TCG reliable?
The price and inventory of NCP103AMX345TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP103AMX345TCG is usually 5 days.
3.What payment methods are accepted for NCP103AMX345TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP103AMX345TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP103AMX345TCG?
NCP103AMX345TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP103AMX345TCG 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 NCP103AMX345TCG?
For technical support, including NCP103AMX345TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP103AMX345TCG requirements.
6.How does Aetrix verify that NCP103AMX345TCG is sourced from the original manufacturer or authorized distributors?
All NCP103AMX345TCG 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 NCP103AMX345TCG meets industry standards.
7.What is the process for return or replacement of NCP103AMX345TCG?
All NCP103AMX345TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP103AMX345TCG, 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 NCP103AMX345TCG part is unused and in its original packaging.
Return procedure for NCP103AMX345TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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