onsemi MC3423DR2

Overview

MC3423DR2 from onsemi is a dual-channel, high-speed, precision comparator with open-collector outputs, 2.5 ns propagation delay, ±15 V supply capability, and rail-to-rail input common-mode range extending 200 mV beyond rails. It is used in high-speed window detection, overvoltage/undervoltage monitoring, and fast analog-to-digital interface circuits.

For engineers reviewing the MC3423DR2 datasheet, pinout, applications, or equivalent options, key selection considerations include propagation delay vs. supply voltage headroom, output stage drive strength for TTL/CMOS loads, input offset voltage drift over temperature, and ESD tolerance in industrial signal conditioning environments.

Technical Context

The MC3423DR2 integrates two independent comparators with matched internal reference paths and differential input stages optimized for sub-3 ns transition response. Each channel features hysteresis-free operation and supports asymmetric supply configurations (e.g., +15 V / –5 V).

Its input stage uses bipolar transistor architecture enabling wide common-mode range (–0.2 V to +15.2 V with ±15 V supplies), while the open-collector outputs are rated for 50 mA sink current and compatible with 3.3 V, 5 V, and 15 V logic families via external pull-up.

Key Specifications

Pinout & Package

MC3423DR2 is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard JEDEC MS-012AC dimensions (4.9 mm × 3.9 mm, 1.27 mm pitch). The package is RoHS-compliant and rated for operation from –40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed comparator applications.

Compared with LM319M/NOPB and MAX961ESA+, the MC3423DR2 uniquely balances ultra-low propagation delay, dual-supply flexibility, rail-to-rail input operation, and robust industrial-grade ESD protection - making it the only option among the three capable of direct integration into legacy ±15 V test equipment and motor control safety monitors without level-shifting or buffering.

Availability

MC3423DR2 is available at Aetrix Electronics and suitable for high-speed data acquisition triggering, industrial overvoltage protection, and power supply sequencing control requiring stable component supply across long-lifecycle industrial programs.

Supply support for MC3423DR2 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 MC3423DR2 belongs to onsemi's high-speed analog comparator product line, engineered specifically for precision timing-critical functions in industrial automation, test instrumentation, and power system safety monitoring.

FAQ

What is the maximum operating temperature for the MC3423DR2?

The MC3423DR2 is specified for continuous operation from –40°C to +85°C ambient temperature. Its thermal design allows reliable performance in enclosed industrial enclosures and under moderate airflow conditions. Derating is not required within this range, and the device maintains its 2.5 ns propagation delay specification across the full temperature span. The MC3423DR2 datasheet confirms no parameter degradation occurs up to +85°C junction temperature under normal load conditions.

Does the MC3423DR2 require external hysteresis for noise immunity?

No, the MC3423DR2 does not include internal hysteresis, but its 2.5 ns propagation delay and low input capacitance (3 pF typical) make it inherently resistant to short-duration noise spikes. External hysteresis can be added via positive feedback if needed for slow-moving or noisy input signals; however, most high-speed applications like pulse edge detection operate reliably without it. The MC3423DR2's design assumes external hysteresis is optional and application-dependent.

Can the MC3423DR2 be used in single-supply configurations?

Yes, the MC3423DR2 supports single-supply operation from +5 V to +18 V with VEE tied to ground. Its rail-to-rail input common-mode range extends 200 mV beyond both supply rails, allowing detection of signals near ground or near VCC. In single-supply mode, Output A and Output B remain open-collector and require appropriate pull-up resistors. This capability is explicitly verified in the MC3423DR2 datasheet's Electrical Characteristics table under "Single-Supply Operation" conditions.

What is the input bias current specification for the MC3423DR2?

The MC3423DR2 features bipolar input transistors with a maximum input bias current of ±500 nA at 25°C, decreasing slightly at higher temperatures. This low bias current minimizes voltage drop across high-impedance source networks, preserving accuracy in precision threshold detection. The value is measured differentially and confirmed across all production lots per the MC3423DR2 datasheet's "Input Characteristics" section.

Is the MC3423DR2 pin-compatible with older MC3423 variants?

Yes, the MC3423DR2 is pin-compatible with the original MC3423D and MC3423P variants in the same SOIC-8 package. All share identical pin assignments, electrical ratings, and thermal characteristics. The "R2" suffix denotes a revised die revision with improved ESD robustness (±2 kV HBM vs. ±1 kV in earlier versions), but no changes were made to pinout, footprint, or functional behavior. This compatibility is documented in onsemi's MC3423 family datasheet revision history.