onsemi MC33269D-012G

Overview

MC33269D-012G 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 is designed for space-constrained industrial power rails where input voltage may be as low as 13.2 V.

For engineers reviewing the MC33269D-012G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance under 800 mA load, thermal resistance in DPAK package, stability with 10 µF output capacitor, and compatibility with 20 V max input in 12 V output configuration.

Technical Context

The MC33269D-012G employs a composite PNP–NPN pass transistor architecture enabling low dropout while maintaining high current capability. Its internal reference is trimmed to 1.25 V (±1%) and stabilized across −40°C to +125°C ambient temperature.

Line regulation is specified at ≤0.3% over 13.2 V to 20 V input range; load regulation is ≤0.5% from 10 mA to 800 mA. Ripple rejection reaches 55 dB at 120 Hz, supporting clean DC supply in noise-sensitive analog subsystems.

Key Specifications

Pinout & Package

DPAK (TO-252) package, case 369C, with exposed heatsink tab electrically connected to Pin 2 (V_OUT). Compact 6.10 × 6.54 mm footprint ideal for PCB area-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV33269DTRK−12G, the MC33269D-012G offers identical performance but lacks automotive qualification documentation; versus LM2940CT-12/NOPB, it provides lower dropout and DPAK thermal performance at the cost of non-automotive status and different package geometry.

Availability

MC33269D-012G is available at Aetrix Electronics and suitable for industrial PLCs, medical front-ends, and point-of-sale terminals requiring stable component supply with consistent parametric performance across production batches.

Supply support for MC33269D-012G 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 technologies for automotive, industrial, and cloud infrastructure markets.

The MC33269 series was developed to deliver robust, low-dropout regulation in cost-sensitive industrial and automotive subsystems where reliability under thermal stress and input voltage variation is critical.

FAQ

What is the maximum input voltage for MC33269D-012G?

The MC33269D-012G has an absolute maximum input voltage of 20 V. However, because its output is fixed at 12 V, the maximum allowed input–output differential is 8.0 V per datasheet Note 1 - limiting practical maximum input to 20 V but recommending ≤13.2 V minimum for reliable dropout operation. Exceeding 20 V risks permanent device damage.

Does MC33269D-012G require an external output capacitor, and what type is recommended?

Yes, MC33269D-012G requires a minimum 10 µF output capacitor with ESR between 0.2 Ω and 10 Ω for stability. Solid tantalum or polymer aluminum capacitors are preferred over standard electrolytics due to better low-temperature ESR behavior. Ceramic capacitors are not recommended alone due to risk of oscillation.

Is MC33269D-012G pin-compatible with other MC33269 variants like the adjustable version?

No - the MC33269D-012G uses the same DPAK (3-pin) package and pinout (Pin 1 = GND, Pin 2 = V_OUT, Pin 3 = V_IN) as other fixed-output D-suffix variants, but differs functionally from the adjustable MC33269 (which uses Pin 1 as Adj). The pinout is identical across fixed-output DPAK parts, but not shared with adjustable versions in same package.

What thermal performance can be expected from MC33269D-012G in DPAK package?

In the DPAK (Case 369C) package, MC33269D-012G has a junction-to-ambient thermal resistance (θ_JA) of 92°C/W at TA = 25°C with standard PCB layout. With 25 mm² 2 oz. copper pad, θ_JA improves to ~40°C/W - enabling ~1.1 W continuous dissipation before reaching 150°C max junction temperature at 25°C ambient.

Can MC33269D-012G be used in automotive applications?

The MC33269D-012G is rated for −40°C to +125°C operating ambient temperature and meets industrial reliability standards, but it is not AEC-Q100 qualified. For automotive use, the NCV33269DTRK−12G variant - which shares identical electrical specs and DPAK package - is the qualified alternative with full PPAP documentation and automotive process controls.