Microchip Technology TC1269-3.3VUA

Overview

TC1269-3.3VUA from Microchip Technology is a fixed-output, high-accuracy (±0.5%) CMOS low-dropout linear regulator delivering 3.3V at up to 300mA. It features ultra-low dropout voltage (240mV at full load), 50μA typical supply current, and integrated shutdown control with 0.05μA standby current-designed for battery-powered portable electronics requiring stable, low-noise power.

For engineers reviewing the TC1269-3.3VUA datasheet, TC1269-3.3VUA pinout, TC1269-3.3VUA application, or TC1269-3.3VUA equivalent, key selection criteria include output accuracy over temperature (40 ppm/°C), Bypass-input noise reduction capability, thermal/overcurrent protection, and MSOP-8 compatibility with minimal 1μF output capacitance.

Technical Context

The TC1269-3.3VUA implements a CMOS-based regulation architecture that maintains output stability across 0–300mA load range without supply current increase-unlike legacy bipolar LDOs. Its internal reference bypass input (Pin 5) accepts a 470pF capacitor to reduce output noise to 260nV/√Hz at 1kHz.

Shutdown control (Pin 7) operates with logic-compatible thresholds (VIH ≥ 45% VIN, VIL ≤ 15% VIN), enabling direct interface with microcontroller I/O. Thermal shutdown activates at 150°C and releases at ~140°C, while output remains stable under line regulation (0.05% typical) and load regulation (0.5% typical from 0.1mA to 300mA).

Key Specifications

Pinout & Package

TC1269-3.3VUA is housed in an 8-pin MSOP package (3.0mm × 3.0mm, 0.65mm pitch), optimized for space-constrained PCB layouts and thermal performance via lead conduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-3302E/TO and TCS2117-33IDBVR, TC1269-3.3VUA uniquely combines Bypass-input noise suppression, full thermal shutdown, and ±0.5% accuracy across –40°C to +125°C junction range-making it optimal for medical, industrial, and automotive-critical 3.3V rail generation where reliability and signal integrity are non-negotiable.

Availability

TC1269-3.3VUA is available at Aetrix Electronics and suitable for battery-operated medical instruments, portable diagnostic devices, and industrial wireless sensor nodes requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for TC1269-3.3VUA 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 ISO/TS-16949 and ISO 9001 certifications.

The TC1269 product line was designed as a CMOS-based, high-accuracy LDO family targeting battery-powered and noise-sensitive applications-replacing legacy bipolar regulators with superior efficiency, precision, and integration.

FAQ

What is the minimum input voltage required for TC1269-3.3VUA to maintain regulated 3.3V output at 300mA load?

The TC1269-3.3VUA requires a minimum input voltage of 3.54V to sustain 3.3V output at 300mA, based on its maximum dropout voltage of 240mV (3.3V + 0.24V). Input below this threshold causes output to drop out of regulation. The device operates across 2.5V–6.0V input range, but full-load regulation is only guaranteed above the dropout margin.

Can TC1269-3.3VUA be used without connecting the Bypass (Pin 5) pin?

Yes, TC1269-3.3VUA functions correctly with Pin 5 (Bypass) left unconnected. The Bypass input is optional: connecting a 470pF capacitor to ground reduces output noise by filtering the internal reference, but omission has no impact on regulation, stability, or basic functionality. Use only when low-noise performance is required for sensitive analog circuits.

Does TC1269-3.3VUA include overtemperature protection, and how does it behave?

Yes, TC1269-3.3VUA incorporates fully integrated overtemperature protection. When die temperature exceeds 150°C, the regulator shuts down automatically and holds output at zero volts. It remains off until junction temperature falls to approximately 140°C, then resumes normal operation-no external circuitry or reset signal is needed. This behavior is documented in DS21380C Section 4.1.

What is the recommended output capacitor value and type for stable operation of TC1269-3.3VUA?

Microchip specifies a minimum 1μF output capacitor for TC1269-3.3VUA, with ESR between 0.1Ω and 5.0Ω and resonant frequency above 1MHz. Ceramic (X5R/X7R), tantalum, or aluminum electrolytic types are acceptable. Solid tantalum is preferred for operation below –25°C due to aluminum electrolytic freezing. The capacitor must be placed close to VOUT and GND pins to ensure stability and transient response.

Is TC1269-3.3VUA pin-compatible with other variants in the TC1269 family, such as TC1269-5.0VUA?

Yes, all TC1269 variants-including TC1269-3.3VUA and TC1269-5.0VUA-share identical 8-pin MSOP packaging and pinout. The only functional difference is the factory-trimmed output voltage; electrical characteristics (dropout, current capability, shutdown behavior, protection features) are identical across the family. This allows drop-in replacement when voltage requirements change, provided input voltage headroom accommodates the new VOUT.