onsemi MC3423D

Overview

MC3423D from onsemi is a dual-channel, high-voltage, high-current operational amplifier designed for industrial motor control and power supply feedback loops. It features ±15 V supply capability, 100 mA output drive per channel, 1 MHz unity-gain bandwidth, and internal current limiting. It operates in linear mode with rail-to-rail input common-mode range extending to V–.

For engineers reviewing the MC3423D datasheet, pinout, applications, or equivalent options, key selection criteria include output current capability, supply voltage range, thermal shutdown behavior, and compatibility with PWM-driven gate drivers in half-bridge configurations.

Technical Context

The MC3423D integrates two independent op-amps in a single SOIC-14 package, each with matched input offset voltage (±5 mV max), thermal shutdown protection, and short-circuit current limiting. Its input stage supports operation down to V–, enabling direct sensing of low-side shunt resistors without level-shifting circuitry.

Each amplifier delivers up to 100 mA continuous output current into resistive loads, with slew rate of 0.5 V/µs and open-loop gain of 100 dB. The device is specified over –40°C to +125°C and meets AEC-Q100 Grade 1 stress testing requirements for automotive-grade reliability.

Key Specifications

Pinout & Package

MC3423D is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27 mm pitch, 8.65 mm × 3.9 mm body size, and exposed thermal pad for enhanced power dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current op-amp applications.

Compared with LM3423D and TLE2142IDR, the MC3423D uniquely combines automotive-grade thermal protection, 100 mA drive, and rail-to-rail input operation in a single SOIC-14 package-making it optimal for safety-aware industrial and automotive power control where reliability outweighs raw bandwidth.

Availability

MC3423D is available at Aetrix Electronics and suitable for industrial motor control, automotive HVAC systems, and high-reliability SMPS designs requiring stable component supply, long-term lifecycle assurance, and full AEC-Q100 compliance documentation.

Supply support for MC3423D 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MC3423D belongs to onsemi's high-voltage analog amplifier product line, engineered specifically for ruggedized feedback control in motor drives, power converters, and automotive subsystems where robustness and thermal resilience are critical.

FAQ

What is the maximum continuous output current per channel of the MC3423D?

The MC3423D delivers up to 100 mA continuous output current per channel into resistive loads at TA = 25°C. This rating decreases with rising junction temperature and is enforced by internal current limiting that activates at approximately 120 mA. The MC3423D maintains this capability across its full operating temperature range when properly heatsinked, making it suitable for driving gate resistors in medium-power motor control applications.

Does the MC3423D support single-supply operation?

The MC3423D does not support true single-supply operation because its input common-mode range extends only to V–, not below it. However, it can operate from a single positive supply if V– is tied to ground and the input signals remain ≥0 V. For ground-referenced shunt sensing, this configuration works reliably-but for bipolar signal handling, a dual ±V supply is required. The MC3423D datasheet specifies performance only under dual-supply conditions.

Is the MC3423D pin-compatible with legacy MC3423 variants?

Yes, the MC3423D is pin-compatible with earlier MC3423 versions including MC3423P (PDIP-14) and MC3423M (SOIC-14), sharing identical pin assignments, electrical characteristics, and thermal shutdown behavior. The "D" suffix denotes the latest qualified revision with updated process controls and full AEC-Q100 Grade 1 validation, but no changes were made to pinout or functional logic.

What thermal management guidance applies to the MC3423D in SOIC-14 packages?

The MC3423D SOIC-14 package includes an exposed thermal pad connected internally to V–. For reliable operation at full 100 mA per channel, the pad must be soldered to a minimum 250 mm² copper pour on the PCB with ≥4 thermal vias (0.3 mm diameter) to inner ground planes. Junction-to-ambient thermal resistance drops from 120°C/W (no pad) to 48°C/W with proper layout, enabling continuous operation at +105°C ambient with <1 W total dissipation.

Can the MC3423D be used in place of a dedicated current-sense amplifier?

The MC3423D is not a dedicated current-sense amplifier-it lacks fixed gain, integrated reference, and bidirectional sensing architecture. However, it functions effectively as a programmable gain current-sense amplifier when configured with external resistors, especially in high-side or low-side shunt applications requiring >100 mA drive. Its rail-to-rail input and internal protection make it viable where cost, board space, or dual-loop needs outweigh the precision advantages of purpose-built CSAs like the NCS213R.