Microchip Technology MCP1701-5002I/TO

Overview

MCP1701-5002I/TO from Microchip Technology is a fixed-output 5.0V, ±2% tolerance, 250 mA CMOS low-dropout linear voltage regulator in TO-92 package, featuring 2.0 µA typical quiescent current, 630 mV typical dropout at 200 mA, and operation up to 10 V input - designed for lithium-ion, 9V alkaline, and multi-cell battery-powered microcontroller power rails.

For engineers reviewing the MCP1701-5002I/TO datasheet, MCP1701-5002I/TO pinout, MCP1701-5002I/TO application, or MCP1701-5002I/TO equivalent, key selection criteria include ultra-low IQ for battery lifetime extension, tight output regulation under load and temperature, SOT-23A/SOT-89/TO-92 package compatibility, and stability with 1 µF tantalum output capacitance.

Technical Context

The MCP1701-5002I/TO implements a P-channel MOSFET pass element with internal voltage reference and error amplifier, enabling stable regulation without external compensation. Its CMOS architecture ensures quiescent current remains constant across load (2.0 µA typ), unlike bipolar regulators.

Dropout behavior is characterized by 400–630 mV over 200 mA at 5.0V output, with thermal performance governed by TO-92's θ_JA ≈ 200°C/W (typical on 1-in² copper). Output stability requires ≥1 µF output capacitor with ESR between 0.1 Ω and 5 Ω.

Key Specifications

Pinout & Package

Package: TO-92 (3-lead plastic transistor outline), JEDEC TO-92 equivalent per Microchip documentation (DS21874B-page 17 confirms TO-92 was removed from datasheet revision B but part number suffix "/TO" explicitly denotes TO-92 packaging per Microchip's Product Identification System).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700-5002E/TO and TC1015-5.0VCT713, the MCP1701-5002I/TO uniquely balances 250 mA drive, TO-92 through-hole compatibility, and industrial temperature range - making it optimal for legacy-compatible, medium-current battery systems where layout flexibility and long-term serviceability matter.

Availability

MCP1701-5002I/TO is available at Aetrix Electronics and suitable for battery-powered smoke detectors, CO₂ detectors, and smart battery packs requiring stable component supply with long-lifecycle support and traceable sourcing.

Supply support for MCP1701-5002I/TO 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

Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS-16949:2002 certification for design and wafer fabrication.

The MCP1701 family was engineered specifically for ultra-low-power, single-cell and multi-cell battery applications - prioritizing micropower operation, wide input range, and capacitor-stable regulation without external components.

FAQ

What is the maximum input voltage rating for the MCP1701-5002I/TO?

The MCP1701-5002I/TO has an absolute maximum input voltage of +12 V, with recommended continuous operation up to 10.0 V per DS21874B. Exceeding 12 V risks permanent damage. For reliable 5.0 V output, VIN must remain ≥5.63 V under 200 mA load due to 630 mV typical dropout.

Does the MCP1701-5002I/TO require external capacitors, and what values are recommended?

Yes, the MCP1701-5002I/TO requires both input and output capacitors. A minimum 1 µF tantalum or aluminum-electrolytic capacitor is specified for C_OUT, with ESR between 0.1 Ω and 5 Ω. A 1 µF input capacitor is recommended, especially with high-impedance sources like batteries. Ceramic capacitors may be used but require attention to ESR for stability.

Is the MCP1701-5002I/TO pin-compatible with other TO-92 LDOs such as the LM78L05?

No, the MCP1701-5002I/TO is not pin-compatible with LM78L05. While both use TO-92, the MCP1701-5002I/TO pinout is GND–VIN–VOUT (Emitter–Collector–Base), whereas LM78L05 uses Input–GND–Output. Swapping them will cause immediate failure. Always verify pin mapping using DS21874B Table 3-1.

What thermal derating applies to the MCP1701-5002I/TO in TO-92 package at 200 mA load?

At 200 mA and 5.0 V output, with VIN = 7.0 V, power dissipation is (7.0 − 5.0) V × 0.2 A = 400 mW. With TO-92 θ_JA ≈ 200°C/W, junction rise is ~80°C. At 25°C ambient, T_J ≈ 105°C - near but below the 125°C storage limit. Derate load current above 60°C ambient or add heatsinking to maintain reliability.

How does the MCP1701-5002I/TO behave during short-circuit conditions?

The MCP1701-5002I/TO incorporates internal short-circuit protection that limits output current to approximately 500 mA peak (per Absolute Maximum Ratings). Under sustained short, it enters thermal shutdown if junction temperature exceeds safe limits. Recovery is automatic once fault clears and temperature drops - no latch-up or manual reset required.