onsemi MC33269DR2-012

Overview

MC33269DR2-012 from onsemi is a fixed-output, low-dropout linear voltage regulator delivering 12 V at up to 800 mA, featuring 1.0 V dropout at 500 mA, ±1% output voltage tolerance, and integrated thermal shutdown and short-circuit protection. It serves as a primary power rail regulator in automotive body control modules requiring stable 12 V supply under low-input-voltage conditions.

For engineers reviewing the MC33269DR2-012 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance at full load, thermal resistance in SO-8 package, output accuracy over −40°C to +125°C, and compatibility with 10 µF output capacitor stability requirements.

Technical Context

The MC33269DR2-012 employs a composite PNP–NPN pass transistor architecture enabling 1.0 V dropout while maintaining regulation down to input voltages as low as 13.0 V (12 V + 1.0 V). Its internal reference is trimmed to 1.25 V with ±1% initial accuracy and ±0.025 V variation over line/load/temperature.

Designed for automotive-grade reliability, it integrates current limiting with foldback behavior and thermal shutdown activation at ~170°C junction temperature-no hysteresis-requiring external heatsinking in high-power applications. The SO-8 (D suffix) package uses pins 1 (GND/Adj), 2 (Vout), and 3 (Vin) with heatsink pad connected to Pin 2.

Key Specifications

Pinout & Package

MC33269DR2-012 is packaged in SO-8 (Case 751, D suffix), with exposed heatsink pad electrically tied to Pin 2 (Vout). The package supports surface-mount assembly and requires PCB copper area for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV33269DR2-012 and TLV1117-12CDR, the MC33269DR2-012 offers automotive-grade thermal robustness and tighter dropout without AEC-Q100 overhead, making it optimal for Tier 2 suppliers needing production-ready reliability without full qualification costs.

Availability

MC33269DR2-012 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and medical portable devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC33269DR2-012 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.

The MC33269 series was designed specifically for low-input-voltage, medium-current regulation in automotive and industrial environments-emphasizing dropout performance, thermal resilience, and AEC-Q100 readiness.

FAQ

What is the minimum input voltage required for MC33269DR2-012 to maintain regulation?

The MC33269DR2-012 requires a minimum input voltage of 13.0 V to sustain 12 V output regulation at full 800 mA load, based on its 1.0 V typical dropout voltage. At lighter loads, regulation holds down to 12.1 V input, but design margins should account for worst-case 1.25 V dropout at 800 mA per datasheet specifications.

Does MC33269DR2-012 require an input bypass capacitor?

While not mandatory for stability, MC33269DR2-012 benefits from a 0.33 µF or larger low-impedance input capacitor placed directly across Vin and GND-especially when connected via long traces or high-impedance sources-to improve transient response and reduce sensitivity to input line impedance at high frequencies.

Can MC33269DR2-012 be used in adjustable-output configurations?

No-MC33269DR2-012 is a fixed 12 V output variant. Adjustable operation requires the base part number MC33269 (without voltage suffix) and external resistor divider between Vout, Adj, and GND. The -012 suffix denotes factory-trimmed 12 V output; pin 1 (Adj) functions solely as ground in this version.

What thermal derating applies to MC33269DR2-012 in SO-8 package?

In free-air conditions, MC33269DR2-012's SO-8 package has θ_JA = 160 °C/W, limiting continuous power dissipation to ~0.31 W at 25°C ambient. With 25 mm PCB copper pour, θ_JA drops to ~60 °C/W, enabling ~0.83 W dissipation-sufficient for 800 mA at 1.25 V dropout (1.0 W max).

Is MC33269DR2-012 compatible with ceramic output capacitors?

No-MC33269DR2-012 is not guaranteed stable with low-ESR ceramic capacitors. The datasheet explicitly warns that ceramic caps placed near the output may cause oscillation. Stability is ensured only with 10 µF electrolytic or solid tantalum capacitors having ESR between 0.2 Ω and 10 Ω across the operating temperature range.