MCP1801T-5002I/OT - 5V 150mA High-PSRR LDO | Microchip
MPN: MCP1801T-5002I/OT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.5448 | $0.54 |
| 10 | $0.5448 | $5.45 |
| 100 | $0.5448 | $54.48 |
| 500 | $0.5448 | $272.40 |
| 1,000 | $0.5448 | $544.80 |
MCP1801T-5002I/OT Overview
A low-dropout regulator, or LDO, is a linear voltage regulator that passes its output through a small residual voltage between input and output while regulating a stable DC rail. LDOs belong to the linear-regulator, voltage-regulator, and power-management-IC hierarchy. They are especially useful when a system needs simpler control, low output noise, and less switching disturbance than a compact DC-DC converter may provide.
The MCP1801 family combines a maximum output current of 150 mA with an input range that covers two to six primary cells, a 9 V alkaline source, and one- or two-cell Li-ion systems. Its fixed 5 V configuration makes this orderable variant useful for sensors, embedded controls, RF modules, and logic rails. The manufacturer describes the MCP1801 as ceramic-output-capacitor stable, while its shutdown feature allows the rail to be disabled when the load no longer needs power.
The 150 mA rating is appropriate for low-current loads, not for motors, high-power display backlights, or other large transients. Input bypass capacitance helps supply fast load changes, and the output capacitor must meet the stability requirements stated in the manufacturer datasheet. Designers should verify startup behavior, dropout margin, and the allowable input and output capacitor ranges in the final voltage and temperature conditions.
This part is useful as a local post-regulator following a switching stage, as a battery-derived 5 V rail, or as a noise-conscious supply for an analog or mixed-signal module. Compared with a switching regulator, its linear topology avoids the inductor and switching node, but it dissipates the difference between input and output voltage as heat. That trade-off is most favorable when the available current is modest and the voltage drop is limited.
The SOT-23-5 footprint supports compact layouts, yet its exposed thermal capability is limited. Place input and output capacitors close to their respective pins, use a short and appropriately sized ground return, and avoid routing sensitive signals beneath the regulator if the system is sensitive to power-distribution noise. This page combines verified distributor and manufacturer information with practical design guidance, procurement context, and a traceable source list rather than repeating only the basic catalog description.
Drop-in alternatives for MCP1801T-5002I/OT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MCP1801T-5002I/OT (same form factor and footprint) — differing in Maximum Output Current, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MCP1754
✅ Drop-In📋 Reference alternative (not in catalog)
MCP1800
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MCP1802
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MCP1804
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MCP1755ST-5002E/DB
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.37 / Unit
View Datasheet →MCP1801T-5002I/OT Maximum Ratings & Electrical Characteristics
| Regulator Type | Fixed-output CMOS low-dropout linear voltage regulator |
| Output Polarity | Positive |
| Output Configuration | 1 fixed output |
| Nominal Output Voltage | 5.0 V |
| Maximum Output Current | 150 mA |
| Minimum Input Operating Voltage | 2.0 V |
| Maximum Input Operating Voltage | 10.0 V |
| Quiescent Current | 25 µA typical |
| Shutdown Control | Yes |
| Output-Capacitor Stability | Ceramic output capacitor stable |
| Process Technology | CMOS |
| Package | SOT-23-5 |
| Mounting Type | Surface mount |
MCP1801T-5002I/OT Pin Configuration
| Pin 1 | VIN — Input supply voltage |
| Pin 2 | GND — Ground connection |
| Pin 3 | EN — Shutdown or enable control |
| Pin 4 | VOUT — Regulated output voltage |
| Pin 5 | NC — Not connected (per manufacturer datasheet) |
Typical Applications
MCP1801T-5002I/OT is suitable for 6 applications: Battery-Powered Sensor Node, Embedded-Control Logic Rail, RF Module Power Conditioning, USB Low-Power Peripheral, Portable Measurement Front End, Battery Charging and Auxiliary Rail.
Battery-Powered Sensor Node
The MCP1801T-5002I/OT is appropriate for a low-current battery-powered sensor node that needs a regulated 5 V rail from a 2.0 V to 10.0 V source. Its fixed 5 V output can support sensor-interface electronics, while the 25 µA typical quiescent current helps preserve battery life when the load is inactive. The design should include local input and output capacitors close to the regulator and should verify that the battery voltage remains high enough to avoid dropout at the maximum load. The 150 mA current limit is appropriate for sensors and interface circuits, not a motor or high-power transmitter.
Recommended
Embedded-Control Logic Rail
Use the MCP1801T-5002I/OT as a compact post-regulator for low-power embedded-control logic that operates from a nominal 5 V rail. Its 150 mA capability provides margin for modest digital loads, while the linear CMOS architecture avoids the external inductor and switching node of a buck converter. This can simplify routing in a small control board, but heat rises with the difference between VIN and VOUT. Confirm the upstream rail range, startup sequencing, shutdown logic, and the regulator’s exact dropout behavior before assigning the part to a processor or peripheral cluster.
Recommended
RF Module Power Conditioning
The MCP1801T-5002I/OT can provide local power conditioning for a low-power RF module when the module needs a stable 5 V rail and the total load remains below 150 mA. The high-PSRR and low-noise characteristics described for the MCP1801 family are useful when upstream switching or battery conversion noise could affect sensitive circuitry. The regulator still requires careful input and output decoupling, a short return path, and thermal review. Confirm the RF module’s peak current, transmitter duty cycle, supply ripple tolerance, and shutdown requirements before using the LDO in the final design.
Recommended
USB Low-Power Peripheral
The MCP1801T-5002I/OT is suitable for a small USB-powered peripheral when the downstream circuit needs a regulated 5 V rail and the load is within the 150 mA limit. The fixed output simplifies rail planning for sensors, indicators, and low-power controllers. However, the part’s input and output network, thermal dissipation, and shutdown sequencing must be checked against the USB source and the attached load. The verified data does not establish USB compliance or a specific USB power budget, so treat this as a generic low-current rail example rather than a certified USB design reference.
Recommended
Portable Measurement Front End
The MCP1801T-5002I/OT can support a compact measurement front end that combines a 5 V analog rail with low-power control circuitry. The device’s low-noise LDO topology is preferable to an unfiltered supply for sensitive signal-conditioning stages, provided that the input-to-output differential and load are modest. Place the regulator and capacitors away from high-current switching nodes, and use a clean ground reference for analog return currents. The 150 mA rating and 25 µA typical quiescent current help bound the load, but exact noise, PSRR, dropout, and temperature data must be verified in the manufacturer datasheet.
Recommended
Battery Charging and Auxiliary Rail
The MCP1801T-5002I/OT can provide a regulated auxiliary 5 V branch in a battery-powered system when the main charger or converter is already producing a compatible source and the auxiliary load is modest. The 2.0 V to 10.0 V input range can accommodate several battery architectures, while shutdown can reduce consumption when the auxiliary branch is inactive. It is not a charger and should not be used to control battery charging directly. Verify the source impedance, inrush behavior, output capacitor, thermal conditions, and load-sharing architecture before integrating it with a battery-management circuit.
Recommended
Engineering reference data for MCP1801T-5002I/OT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MCP1754 | MCP1800 | MCP1802 | MCP1804 | MCP1755 |
|---|---|---|---|---|---|---|
| Package | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
Key Differentiators
- Fixed 5 V output in a compact SOT-23-5 package (vs MCP1754)
- Low quiescent current for battery-operated systems (vs MCP1800)
- High-PSRR and low-noise positioning (vs MCP1802)
- Shutdown support for controlled power management (vs MCP1804)
Design Notes
Place input bypass capacitance directly at VIN and output capacitance directly at VOUT, with short traces and a low-impedance ground return. The MCP1801 is specified as ceramic-output-capacitor stable, but the exact capacitance, ESR, voltage rating, and startup limits must be selected from the manufacturer datasheet. Account for capacitor DC-bias derating; a nominal high-capacitance ceramic can lose substantial effective capacitance at the 5 V bias.
Estimated: at 150 mA, a 10 V input, and a 5 V output, the ideal linear-regulator dissipation is 0.75 W. This estimate uses only the input-to-output voltage difference and does not include internal losses. Actual junction temperature depends on ambient temperature, duty cycle, package thermal resistance, and PCB copper. If the regulator runs continuously near this condition, verify the manufacturer thermal limits and consider a lower-dropout supply arrangement or heat-spreading copper.
Keep the regulator’s input loop, output capacitor, and ground connection compact so switching or high-current load currents do not share sensitive analog-return paths. Route the shutdown signal away from VIN and VOUT edges. The SOT-23-5 package is small, so assembly tolerances and exposed-pad or lead-form handling should follow the manufacturer’s land pattern and reflow guidance rather than an inferred footprint.
Do not assume that a regulator labeled SOT-23-5 is pin-compatible merely because it has the same package outline. Before replacing MCP1801T-5002I/OT, verify VIN, GND, EN, and VOUT positions, shutdown polarity, output-voltage accuracy, current rating, capacitor requirements, and dropout voltage at the intended load. Also check that the source remains above the regulator’s dropout threshold throughout battery discharge and temperature variation.
Compliance Information
The supplied verified sources establish Microchip product, electrical, package, and distributor information but do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Obtain current compliance declarations from Microchip or the authorized distributor before procurement.
