Texas Instruments UC2709N

Overview

UC2709N from Texas Instruments is a dual high-speed FET driver IC designed to rapidly switch the capacitive gates of power MOSFETs in industrial and power-conversion circuits. It delivers ±1.5 A peak source/sink current, achieves 40 ns rise/fall times into 1000 pF, operates from 5 V to 40 V supply, and includes thermal shutdown protection - enabling robust gate driving in DC-DC converters and motor control stages.

For engineers reviewing the UC2709N datasheet, UC2709N pinout, UC2709N application, or UC2709N equivalent, key selection considerations include its 8-pin PDIP package, TTL-compatible inverting inputs, 1.5 A peak drive capability, thermal protection, and compatibility with legacy MMH0026/DS0026 layouts in cost-sensitive industrial power designs.

Technical Context

The UC2709N integrates two independent totem-pole output stages fabricated in a high-speed Schottky process, each capable of sourcing or sinking up to 1.5 A peak current while minimizing cross-conduction spikes. Its inverting logic inputs ensure full TTL compatibility, and internal 5-V regulation supports stable input thresholding across wide supply ranges.

Thermal shutdown activates at ~155°C junction temperature, and the device is rated for continuous operation from –40°C to +85°C ambient. Absolute maximum ratings specify ±500 mA steady-state output current and ±1.5 A transient peak per channel, with 20 mJ capacitive discharge energy handling in the N-package variant.

Key Specifications

Pinout & Package

UC2709N is housed in an 8-pin plastic dual in-line package (PDIP, package code P), with 0.3-inch body width and 0.1-inch lead pitch. The package features through-hole mounting, no internal connections on pins 1 and 5, and a GND reference on pin 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual high-speed FET driver applications.

Compared with UC3709N and MMH0026, UC2709N provides the optimal balance of industrial temperature range, integrated thermal protection, and low quiescent current - making it the preferred choice for new designs requiring reliability across harsh environments without added protection circuitry.

Availability

UC2709N is available at Aetrix Electronics and suitable for industrial motor control, DC-DC converter gate drive, and transformer-coupled push-pull power supply applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant through-hole packaging.

Supply support for UC2709N 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 decades of expertise in high-reliability industrial and automotive ICs.

The UC2709N belongs to TI's legacy UCx709 family of dual high-speed FET drivers, engineered specifically for cost-effective, robust gate driving in industrial power conversion, motor control, and isolated DC-DC applications.

FAQ

What is the maximum gate capacitance the UC2709N can drive with sub-50 ns rise time?

The UC2709N achieves 40 ns rise/fall times into 1000 pF load, as specified in the datasheet under typical switching characteristics. For larger gate capacitances (e.g., 2–5 nF), rise time scales approximately linearly with C_load; thus, a 2000 pF load yields ~80 ns. Layout parasitics and external gate resistance also influence actual performance, so PCB trace inductance and gate resistor selection must be optimized per application. The UC2709N remains effective for driving most discrete MOSFETs used in industrial power stages.

Does the UC2709N support non-inverting logic configuration?

No, the UC2709N features fixed inverting logic inputs - a high input produces a low output, and vice versa. This architecture is intrinsic to its internal design and cannot be reconfigured. To implement non-inverting behavior, an external inverter (e.g., SN74LVC1G04) must be placed between the controller and UC2709N INPUT A/B pins. The datasheet confirms inverting functionality across all UCx709 variants, with no provision for logic polarity reversal internally.

Is the UC2709N pin-compatible with the DS0026 and MMH0026 devices?

Yes, the UC2709N is explicitly documented as pin-compatible with MMH0026 and DS0026 in the datasheet's feature list and application notes. All three share identical 8-pin DIP pinouts, including N/C on pins 1 and 5, INPUT A/B on pins 2 and 4, OUTPUT A/B on pins 6 and 8, GND on pin 3, and VCC on pin 7. This allows direct replacement in legacy designs, though UC2709N adds thermal shutdown and lower quiescent current not present in the older parts.

What is the thermal resistance (θ_JA) of the UC2709N PDIP package?

The UC2709N in the PDIP (N) package has a junction-to-ambient thermal resistance (θ_JA) of 90°C/W, as specified in the Thermal Resistance Table for the "DIL–16 (N)" row - which applies to the 8-pin PDIP variant per TI's packaging documentation. This value assumes mounting on a standard 5-inch² FR4 PCB with 1 oz copper. Actual θ_JA improves with larger copper areas or thermal vias, and the device's thermal shutdown activates at ~155°C junction temperature to prevent damage under sustained overload.

Can the UC2709N drive both high-side and low-side N-channel MOSFETs in a half-bridge without additional level-shifting circuitry?

No, the UC2709N does not integrate high-side level-shifting capability and is designed for ground-referenced (low-side) or transformer-coupled gate drive. Its outputs swing from GND to VCC only, so driving a high-side N-MOSFET requires either an isolated supply, bootstrap capacitor network, or external level shifter. The datasheet application circuits (Figures 2 and 5) confirm this limitation - Figure 5 explicitly adds negative bias and level-shifting components for high-side use. For integrated high-side drive, consider TI's UCC272xx or LM5113 families instead.