NCP177AMX330TCG - 3.3V 500mA Fast Transient LDO | onsemi
MPN: NCP177AMX330TCG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.1153 | $0.12 |
| 10 | $0.1153 | $1.15 |
| 100 | $0.1153 | $11.53 |
| 500 | $0.1153 | $57.65 |
| 1,000 | $0.1153 | $115.30 |
NCP177AMX330TCG Overview
A low-dropout regulator, or LDO, is a voltage regulator that passes input current through a pass element while controlling its voltage drop. The NCP177 belongs to the linear regulator and power-management IC hierarchy. Its low-dropout architecture preserves headroom in battery-operated systems, while the fixed 3.3 V output supports digital logic, sensors, wireless modules, and embedded microcontrollers without requiring an adjustable feedback network.
The main differentiating feature is fast transient response, which helps the regulator respond quickly when load current changes. The device also supports an enable input for power sequencing and shutdown control. Its 4-pin XDFN package is intended for space-constrained portable electronics, while the 500 mA current capability covers a broad range of low-power embedded loads. The verified distributor data identifies the output as a single fixed positive regulator with 500 mA current capability.
The NCP177 series is specified for an input range of 1.6 V through 5.5 V, making it appropriate for single-cell Li-ion systems and low-voltage rails derived from higher supplies. Its CMOS implementation and low-dropout behavior are useful when available battery headroom is limited. The onsemi product page identifies the device as a very low-dropout regulator with up to 0.5 A load-current capability and 0.8% accuracy at 25°C.
Typical applications include battery-powered sensors, portable measurement equipment, wireless IoT endpoints, smartphone accessories, and compact consumer devices. An enable pin allows a system controller to connect or disconnect the regulated rail, reducing current consumption during standby. Designers should still verify capacitor stability, load transients, thermal conditions, and dropout margin against the exact operating environment.
For PCB design, place the input, output, and enable connections according to the manufacturer land pattern, and use the manufacturer-recommended output capacitor near the output and ground pins. The onsemi datasheet specifically identifies a 1 µF ceramic X7R or X5R capacitor as suitable because of its low capacitance variation over temperature. Verify the final power dissipation at the maximum input-to-output voltage difference and load current before using the part in a thermally constrained design.
This product page consolidates distributor availability, pricing context, verified NCP177 family capabilities, application guidance, and design considerations for engineers evaluating a compact fixed 3.3 V LDO.
Drop-in alternatives for NCP177AMX330TCG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
NCP177AMX330T
✅ Drop-In📋 Reference alternative (not in catalog)
NCP177AMX330R
✅ Drop-In📋 Reference alternative (not in catalog)
NCP177AMX330TCG Maximum Ratings & Electrical Characteristics
| Regulator Type | Fixed positive linear voltage regulator |
| Output Configuration | Single output |
| Output Voltage | 3.3 V |
| Maximum Output Current | 500 mA |
| Input Voltage Range | 1.6 V to 5.5 V |
| Output Voltage Accuracy | 0.8% at 25°C |
| Regulator Topology | Low-dropout linear regulator |
| Control Function | Enable function |
| Transient Response | Fast transient response |
| Process Technology | CMOS |
| Package | 4-pin XDFN, 1 x 1 mm |
| Recommended Output Capacitor | 1 µF ceramic X7R or X5R |
| Battery Compatibility | Li-ion battery powered applications |
| Mounting Type | Surface mount |
| MSL | 1 (Unlimited) |
| RoHS Status | ROHS3 compliant |
| REACH Status | Unaffected |
| Enable Control | Enable function |
NCP177AMX330TCG Pin Configuration
| Pin 1 | VIN — Input supply voltage |
| Pin 2 | GND — Ground connection |
| Pin 3 | EN — Enable input |
| Pin 4 | VOUT — Regulated 3.3 V output; exposed pad connection and exact pin arrangement must follow the datasheel land pattern |
Typical Applications
NCP177AMX330TCG is suitable for 6 applications: Li-Ion Battery Portable Devices, Wireless IoT Sensor Nodes, Portable Measurement and Instrumentation, Smart Home and Edge Sensors, Consumer Electronics and Accessories, Post-Regulator for Low-Voltage Rails.
Li-Ion Battery Portable Devices
The NCP177AMX330TCG fits battery-powered products because its verified 1.6 V to 5.5 V input range accommodates Li-ion systems while delivering a fixed 3.3 V rail at up to 500 mA. Its low-dropout CMOS regulator architecture is useful when battery headroom is limited. Place the device near the load and use the onsemi-recommended 1 µF X7R or X5R output capacitor. The enable input allows the system controller to disconnect the rail during standby, reducing wasted current while preserving a compact 4-pin XDFN footprint.
Recommended
Wireless IoT Sensor Nodes
For wireless sensor nodes, the NCP177AMX330TCG provides a regulated 3.3 V supply up to 500 mA with an enable function for controlled startup. The fixed output eliminates an external feedback divider, while the compact 4-pin XDFN 1 x 1 mm package helps conserve board area. Fast transient response is relevant when a radio, sensor, or digital logic block changes load current. Designers should validate the regulator against the node’s peak current and supply noise requirements rather than assume the 500 mA rating covers every transient.
Recommended
Portable Measurement and Instrumentation
The NCP177AMX330TCG is appropriate for compact measurement equipment requiring a stable 3.3 V rail from a low-voltage source. Its stated 0.8% output accuracy at 25°C provides a defined starting point for precision supply requirements, and the enable function supports power management in battery-operated instruments. The low-dropout behavior helps preserve regulation when input voltage approaches the desired output. The output capacitor must be placed close to the device, and system-level error budget calculations should include temperature, load, and source impedance.
Recommended
Smart Home and Edge Sensors
Smart-home sensor modules often combine a low-power MCU, analog sensing front end, and a 3.3 V digital rail. The NCP177AMX330TCG can supply that rail up to 500 mA while its enable pin supports controlled power sequencing. Its small XDFN package is useful in compact sensor housings, and the fixed 3.3 V output simplifies firmware and analog design. Check the module’s peak current, startup sequence, and thermal dissipation at the highest expected input voltage before finalizing the power architecture.
Recommended
Consumer Electronics and Accessories
The NCP177AMX330TCG suits compact consumer accessories that require a regulated 3.3 V rail from a battery or low-voltage adapter. Its 500 mA output capability covers many sensor, control, and connectivity loads, while the enable function supports shutdown and power-sequencing control. The 1 x 1 mm XDFN package reduces footprint compared with larger leaded regulators. Design reviews should confirm capacitor voltage rating, thermal performance, and compatibility with the enclosure’s maximum ambient temperature.
Recommended
Post-Regulator for Low-Voltage Rails
When a system already has a clean low-voltage source, the NCP177AMX330TCG can provide a fixed 3.3 V post-regulated rail for logic and analog sections. Its 1.6 V to 5.5 V operating range and low-dropout behavior make it relevant where the upstream source does not have substantial excess headroom. The enable function helps isolate the rail during standby, while the compact package supports dense boards. Verify the upstream converter’s ripple, startup behavior, and the regulator’s thermal load at worst-case current.
Recommended
Recommended Products Summary
Engineering reference data for NCP177AMX330TCG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | NCP177AMX330T | NCP177AMX330R | MCP1703-3302E | ADP3333 | LP2985-33 |
|---|---|---|---|---|---|---|
| Brand | onsemi | onsemi | onsemi | Microchip Technology | Analog Devices | Texas Instruments |
| Package | 4-XDFN (1x1) | 4-XDFN (1x1) | 4-XDFN (1x1) | SOT-23-3 | SOT-23-3 | SOT-23-5 |
| Output Voltage | 3.3 V fixed | 3.3 V fixed | 3.3 V fixed | 3.3 V fixed | 3.3 V adjustable/fixed options; verify configuration | 3.3 V fixed |
Key Differentiators
- Fixed 3.3 V output with enable control in a very compact footprint (vs LP2985-33)
- Up to 500 mA output capability (vs MCP1703-3302E)
- Low-voltage operation suited to Li-ion systems (vs NCP177AMX330T)
Design Notes
Verify dropout margin at the maximum expected input voltage, output voltage, and load current. The NCP177 family is a low-dropout regulator intended for 1.6 V to 5.5 V inputs, but a 3.3 V rail requires sufficient input headroom for regulation throughout battery discharge and line variation. Also calculate power dissipation as VIN minus VOUT multiplied by load current; use thermal data to confirm that the exposed-pad land pattern can remove the resulting heat.
Place the input and output bypass capacitors as close as possible to the regulator pins and ground return. The onsemi datasheet recommends a 1 µF X7R or X5R ceramic output capacitor because of its low capacitance variation over temperature. Keep the exposed pad and ground path compact, provide adequate via connectivity, and avoid routing noisy switching-current paths near the regulator or sensitive analog loads.
Do not substitute an electrically similar regulator solely by output voltage. The cited cross-brand candidates use different packages from the NCP177AMX330TCG 4-XDFN (1 x 1 mm) footprint, so they may require PCB redesign. Confirm the exact package drawing, pin numbering, enable polarity, output accuracy, current capability, stability capacitor, and thermal performance before approving a replacement.
Compliance Information
The verified PartGenie result lists ROHS3 compliance and REACH unaffected status. The provided data does not establish AEC-Q100 qualification, lead-free status, halogen-free status, or conflict-minerals compliance for this exact device.
