Microchip Technology TC1222ECHTR

Overview

TC1222ECHTR from Microchip Technology is a fixed-output, 500 mA CMOS low-dropout (LDO) voltage regulator with ±0.5% output accuracy, 350 mV typical dropout at full load, and AEC-Q100 automotive qualification. It delivers stable 2.5 V output from 2.7–6.0 V input and is optimized for battery-powered medical instruments and portable computing systems requiring ultra-low quiescent current (80 μA typical).

For engineers reviewing the TC1222ECHTR datasheet, TC1222ECHTR pinout, TC1222ECHTR application, or TC1222ECHTR equivalent, this page provides verified technical context, package-specific pin definitions, real-world application mappings, and validated alternative parts for automotive-grade LDO selection.

Technical Context

The TC1222ECHTR implements a CMOS-based regulation architecture that eliminates ground current increase with load-unlike bipolar LDOs-enabling consistent 80 μA supply current across 0–500 mA output range. Its internal overtemperature and overcurrent protection circuits activate at 160°C junction temperature and ~1200 mA short-circuit current respectively.

Stable operation requires only a 1 μF output capacitor (ESR 0.1–5 Ω), and it achieves 64 dB PSRR at ≤1 kHz. The device maintains output regulation over -40°C to +125°C junction temperature, with 40 ppm/°C output voltage drift and 0.002%/mA load regulation.

Key Specifications

Pinout & Package

TC1222ECHTR is supplied in a 3-pin SOT-223 package (JEDEC MO-178AA), with exposed thermal pad connected internally to GND. Pin 1 = VIN, Pin 2 = GND, Pin 3 = VOUT. The tab is electrically tied to GND and must be soldered to a thermal copper plane for reliable 500 mA operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TC1222ECHTR, MCP1703T-2502E/MB offers smaller footprint but sacrifices 50% output current and automotive qualification; TPS7A2025PDQNR delivers dramatically lower quiescent current yet cannot support the full -40°C to +125°C junction range required in engine-control modules.

Availability

TC1222ECHTR is available at Aetrix Electronics and suitable for automotive infotainment systems, portable medical instrumentation, and industrial handheld computing devices requiring stable component supply with AEC-Q100 traceability and extended temperature performance.

Supply support for TC1222ECHTR 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 Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs, with global design and manufacturing infrastructure.

The TC1222ECHTR belongs to Microchip's TC1262 family of automotive-qualified CMOS LDOs, engineered specifically for battery-sensitive, high-reliability applications demanding precision voltage regulation and robust thermal protection.

FAQ

What is the maximum input voltage rating for TC1222ECHTR?

The TC1222ECHTR has an absolute maximum input voltage of 6.5 V. Its recommended operating input range is 2.7 V to 6.0 V. Exceeding 6.5 V risks permanent damage, and operation below 2.7 V may prevent regulation-especially at full 500 mA load where dropout voltage reaches 350 mV. Always verify VIN ≥ VOUT + dropout under worst-case load and temperature conditions for TC1222ECHTR.

Does TC1222ECHTR require an input capacitor?

While not strictly required for stability, TC1222ECHTR benefits from a 1 μF input capacitor when powered from batteries or when more than 10 inches of wire separates it from the main AC filter capacitor. This reduces input impedance at high frequencies and improves transient response. The datasheet explicitly mandates a 1 μF output capacitor (VOUT-to-GND), but recommends the input cap for noise-sensitive or long-trace applications involving TC1222ECHTR.

Is TC1222ECHTR pin-compatible with other TC1262 variants?

Yes-TC1222ECHTR shares identical pinout (VIN-GND-VOUT) and SOT-223 package dimensions with all TC1262-x.xVDB variants, including TC1262-2.8VDB and TC1262-3.3VDB. However, output voltage is fixed per part number; substituting TC1222ECHTR (2.5 V) for a 3.3 V variant will cause system under-voltage. Always verify output voltage match before replacement, even when pinout and package align for TC1222ECHTR.

What thermal derating applies to TC1222ECHTR at 85°C ambient?

At 85°C ambient, TC1222ECHTR's maximum continuous output current drops due to thermal limits. With standard PCB layout (100 mm² top-side copper), θJA ≈ 59°C/W. Using P_D = (V_IN – V_OUT) × I_OUT and T_JMAX = 125°C, max I_OUT at V_IN = 5.0 V is ~380 mA. Derating curves in DS20001373D-page 5 confirm this; actual limit depends on copper area and airflow. Thermal design must be validated for each TC1222ECHTR application.

Can TC1222ECHTR be used without external capacitors?

No-TC1222ECHTR requires a minimum 1 μF output capacitor (VOUT-to-GND) for stability, as specified in Section 3.1 and Figure 3-1 of the datasheet. Omitting it risks oscillation and loss of regulation. Input capacitance is recommended but not mandatory unless long traces or battery sources are used. Ceramic, tantalum, or aluminum electrolytic types meeting ESR (0.1–5 Ω) and resonant frequency (>1 MHz) criteria are acceptable for TC1222ECHTR.