Texas Instruments UCC27423P

Overview

UCC27423P from Texas Instruments is a dual low-side MOSFET driver with dual inverting outputs, ±4-A peak source/sink current capability, 20-ns rise / 15-ns fall time (1.8-nF load), 4–15-V supply range, and –40°C to 125°C operation - used to drive gate terminals of N-channel power MOSFETs in high-frequency switch-mode power supplies.

For engineers reviewing the UCC27423P datasheet, UCC27423P pinout, UCC27423P application, or UCC27423P equivalent, key selection criteria include inverting logic configuration, enable-controlled channel shutdown, Miller-region current delivery, thermal performance in PDIP-8, and compatibility with 3.3-V/5-V PWM controllers.

Technical Context

The UCC27423P implements a unique bipolar-MOSFET hybrid output stage that delivers ±4 A precisely during the Miller plateau region of MOSFET switching, minimizing transition losses. Its dual inverting logic configuration ensures complementary gate drive for synchronous rectifiers or half-bridge topologies where both switches require inverted control signals.

Each channel features independent active-high enable inputs (ENBA, ENBB) with internal 100-kΩ pull-up to VDD and 0.15–0.9-V hysteresis, enabling precise sequencing and fault isolation. Input thresholds remain TTL/CMOS-compatible across the full 4–15-V supply range, supporting direct interfacing with microcontrollers and PWM ICs without level-shifting.

Key Specifications

Pinout & Package

UCC27423P is housed in an 8-pin PDIP package (body size 9.81 mm × 6.35 mm), optimized for through-hole prototyping and legacy industrial PCBs. Thermal resistance R_θJA = 55.5°C/W enables 350 mW power dissipation at T_A = 70°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-side MOSFET driver applications.

Compared with UCC27423D, the UCC27423P offers superior thermal dissipation in free-air environments but requires through-hole assembly; versus UCC27524ADGN, it provides proven reliability and drop-in compatibility in legacy designs but lacks enhanced current and ESD ratings.

Availability

UCC27423P is available at Aetrix Electronics and suitable for switch-mode power supplies, motor controllers, and Class D amplifiers requiring stable component supply, long-lifecycle support, and traceable sourcing for industrial and automotive programs.

Supply support for UCC27423P 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with over 90 years of innovation in high-reliability industrial and automotive components.

The UCC27423P belongs to TI's high-speed gate driver product line, engineered specifically for efficient, robust MOSFET/IGBT gate driving in high-frequency power conversion systems demanding precise timing and thermal resilience.

FAQ

What logic configuration does the UCC27423P implement?

The UCC27423P implements a dual inverting output configuration: both OUTA and OUTB invert their respective inputs (INA and INB). This makes it ideal for driving two N-channel MOSFETs in synchronous rectifier stages or half-bridge topologies where complementary gate signals are required without external inverters. The UCC27423P truth table confirms high input yields low output and vice versa on both channels.

Can the UCC27423P drive P-channel MOSFETs?

No - the UCC27423P is designed exclusively as a low-side driver with outputs referenced to GND and capable of sinking to GND and sourcing to VDD. It cannot directly drive P-channel high-side MOSFETs, which require a gate voltage below the source. For high-side P-channel drive, a dedicated high-side driver or level-shifting circuit is required. The UCC27423P datasheet explicitly states its use case is for N-channel MOSFETs in low-side configurations.

What is the maximum allowable load capacitance for the UCC27423P?

The UCC27423P is characterized with a 1.8-nF capacitive load for timing specifications (20-ns rise, 15-ns fall), but it can reliably drive larger loads - up to 10 nF - with predictable degradation in rise/fall times (e.g., ~40 ns at 10 nF). The ±4-A peak current rating ensures effective Miller plateau charging even with gate charges exceeding 100 nC. Layout parasitics and external gate resistors must be minimized to maintain performance at high C_iss.

How does the enable function behave when left unconnected on the UCC27423P?

When ENBA and ENBB pins are left unconnected (floating), the UCC27423P defaults to enabled operation because each enable input is internally pulled up to VDD via a 100-kΩ resistor. However, TI strongly recommends terminating unused enable traces as short as possible or tying them to VDD to prevent noise-induced false disabling. Leaving ENx pins floating in noisy environments may cause erratic output behavior due to coupling into the high-impedance input node.

Is the UCC27423P pin-compatible with the UCC27324?

Yes - the UCC27423P maintains industry-standard SOIC-8/PDIP-8 pinout compatibility with the UCC27324, including identical pin assignments for VDD, GND, INx, and OUTx. The key difference is that pins 1 and 8 (NC on UCC27324) are repurposed as ENBA and ENBB on the UCC27423P. In legacy designs where those pins were left unconnected, the UCC27423P operates identically; when used, they add per-channel enable control without PCB changes.