onsemi MC78M06BTG

Overview

MC78M06BTG from onsemi is a 500 mA, 6.0 V fixed-output linear voltage regulator in TO-220 package, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation for rugged local regulation. It delivers stable 6.0 V ±2.5% output across −40°C to +125°C, with 2.0 V dropout and 59 dB ripple rejection at 100 mA/120 Hz - used in automotive body control modules and industrial sensor power rails.

For engineers reviewing the MC78M06BTG datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed −40°C to +125°C operation, TO-220 thermal performance (θ_JC = 5.0°C/W), 350 mA short-circuit current limit, and compatibility with standard 0.33 µF input bypassing per onsemi design guidelines.

Technical Context

The MC78M06BTG implements a monolithic series-pass regulator architecture with built-in protection circuitry: thermal overload shutdown activates at ~150°C junction temperature, and internal current limiting caps peak output at 350 mA under short-circuit conditions. Safe-area compensation dynamically reduces output current as pass transistor V_CE increases, preventing second breakdown.

It operates without external components for basic regulation but requires ≥0.33 µF low-ESR input capacitor when connected via long traces or driving large capacitive loads. Dropout voltage remains fixed at 2.0 V typical across load and temperature, enabling predictable minimum input headroom design.

Key Specifications

Pinout & Package

MC78M06BTG uses the TO-220 (Case 221AB) package with exposed metal tab electrically connected to Pin 2 (Ground). Heatsink surface must be isolated or grounded per application requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC78M06BTG, the MC78M06CDTRKG offers SMT assembly but reduced thermal margin, while NCV78M06BDTRKG provides identical performance with automotive qualification - both require layout changes due to different packages and thermal paths.

Availability

MC78M06BTG is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, medical front-end modules, and point-of-sale terminal power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC78M06BTG 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MC78M00 series was designed as a rugged, drop-in replacement for legacy 78xx regulators - optimized for local on-board regulation in harsh environments where thermal resilience and fault protection are critical.

FAQ

What is the maximum input voltage for MC78M06BTG?

The absolute maximum input voltage for MC78M06BTG is 40 Vdc, as specified in the Maximum Ratings table. However, for reliable operation with 6.0 V output and 2.0 V dropout, the recommended maximum continuous input is 25 Vdc to maintain safe power dissipation and thermal margin within the TO-220 package's 7.52 W limit.

Does MC78M06BTG require an input bypass capacitor?

Yes - onsemi recommends a minimum 0.33 µF tantalum or low-ESR ceramic capacitor placed directly across the MC78M06BTG input pins. This prevents oscillation and improves transient response, especially when input traces are long or upstream filtering is inadequate. The capacitor must be mounted with shortest possible leads to minimize inductance.

What is the output voltage tolerance of MC78M06BTG over temperature?

MC78M06BTG guarantees output voltage between 5.7 V and 6.3 V across its full operating range of −40°C to +125°C. At 25°C, the tighter specification is 5.75 V to 6.25 V (±2.5%). The average temperature coefficient is ±0.2 mV/°C, contributing predictably to total variation.

Can MC78M06BTG be used in parallel for higher current?

No - MC78M06BTG is not designed for parallel operation. Its output voltage tolerance (±2.5%) and lack of current-sharing features mean mismatched units would cause one device to dominate conduction, leading to thermal runaway. For >500 mA, use a single higher-current regulator or implement external current-boosting with a PNP transistor as shown in Figure 12 of the datasheet.

Is MC78M06BTG pin-compatible with older 78M06 variants?

Yes - MC78M06BTG maintains identical pinout (Input-Ground-Output), electrical behavior, and mechanical footprint with legacy TO-220 78M06 regulators. It replaces obsolete versions while adding Pb-free construction and updated thermal specifications (θ_JC = 5.0°C/W), making it a direct drop-in upgrade for existing designs.