Texas Instruments UC3714N

Overview

UC3714N from Texas Instruments is a high-speed complementary switch FET driver IC designed for synchronous rectification and active clamp/reset circuits. It features independently programmable 50–500 ns delays between AUX and PWR outputs, 1-A source / 2-A sink power driver capability, 0.5-A source / 1-A sink auxiliary driver, TTL-compatible INPUT, and ENBL-activated 220-μA sleep mode. It operates in 0°C to 70°C ambient and supports up to 1 MHz switching frequency in forward and flyback converter topologies.

For engineers reviewing the UC3714N datasheet, UC3714N pinout, UC3714N application, or UC3714N equivalent, this device is selected for zero-voltage switching (ZVS) timing control, gate drive sequencing in dual-FET configurations, and low-power synchronous rectifier driver implementations requiring precise dead-time management and true-zero-voltage sensing capability.

Technical Context

The UC3714N implements a dual-output, delay-programmable architecture where INPUT rising edge triggers AUX immediately and initiates T1 delay before PWR turn-on, while INPUT falling edge turns off PWR immediately and initiates T2 delay before AUX reactivation. T1 and T2 pins accept external resistors (e.g., 10 kΩ–100 kΩ) to set delays from 50 ns to 500 ns with ±500 ns tolerance, and also support true-zero-voltage sensing when pulled below 2.5 V.

Its PWR output delivers 1-A source / 2-A sink peak current with ≤0.8 V saturation voltage at 400 mA sink, while AUX provides 0.5-A source / 1-A sink with ≤0.8 V low-level saturation at 20 mA. Propagation delays are typ. 35–100 ns, and ENBL enables 220-μA sleep mode with PWR held active-low regardless of VCC level.

Key Specifications

Pinout & Package

UC3714N is housed in an 8-pin PDIP (Plastic Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard DIP sockets and wave-solder processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar complementary FET driver applications.

Compared with UC3714D and UC2714N, the UC3714N offers identical timing, drive, and functional behavior in a through-hole PDIP package with commercial-temperature grading - making it ideal for lab validation, low-volume power supply builds, and designs prioritizing mechanical robustness over thermal performance or automation compatibility.

Availability

UC3714N is available at Aetrix Electronics and suitable for forward converters, isolated synchronous rectifiers, resonant LLC reset circuits, and low-power flyback adapters requiring stable component supply and long-term design continuity.

Supply support for UC3714N 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 power conversion ICs and driver solutions.

The UC3714N belongs to TI's complementary switch FET driver product line, engineered specifically for soft-switching power topologies including active clamp forward, synchronous rectification, and resonant reset applications - emphasizing precision timing, zero-voltage detection, and robust gate drive.

FAQ

What is the operating temperature range for UC3714N?

The UC3714N is rated for 0°C to 70°C ambient operating temperature. This commercial-grade specification aligns with typical AC-DC adapter and offline power supply use cases. Unlike the UC2714N (–40°C to +85°C), the UC3714N is not intended for extended industrial environments but offers cost and availability advantages in consumer and computing power applications.

How does the UC3714N implement zero-voltage switching (ZVS)?

The UC3714N supports ZVS through its T1 and T2 pins, which double as delay programming inputs and true zero-voltage sense inputs. When either T1 or T2 is pulled below ~2.5 V, the corresponding output (PWR or AUX) activates immediately - enabling direct detection of drain-source voltage collapse without external comparators or timing circuits. This feature is explicitly confirmed in the SLUS170B datasheet Figure 8 and PIN DESCRIPTIONS section.

What is the difference between UC3714N and UC3715N?

The UC3714N features an inverted AUX output relative to INPUT, allowing direct drive of p-channel MOSFETs in auxiliary positions. In contrast, the UC3715N provides true complementary (non-inverted) outputs for dual N-channel configurations. Both share identical delay programming, drive strength, and pinout - the functional distinction lies solely in AUX polarity, as documented in the UC1714/UC1715 family description and Figure 1 of SLUS170B.

Can UC3714N drive both high-side and low-side N-channel MOSFETs?

Yes - the UC3714N can drive two N-channel MOSFETs in a complementary configuration when paired with a charge pump or bootstrap circuit for the high-side gate. Its PWR output (non-inverted, 1-A source/2-A sink) drives the main switch, while AUX (inverted, 0.5-A source/1-A sink) drives the auxiliary switch. Figure 11 in the SLUS170B datasheet demonstrates this exact topology using a charge pump to elevate AUX drive voltage above the high-side source potential.

What is the minimum recommended bypass capacitor for UC3714N VCC?

Texas Instruments recommends a minimum 1-μF ceramic capacitor placed as close as possible to the UC3714N VCC and GND pins. For peak load currents exceeding 1 A or high-frequency operation (>500 kHz), a parallel 10-μF tantalum or aluminum electrolytic capacitor is advised to maintain stable supply voltage under dynamic gate charging demands - per layout guidance in the "Typical Applications" section of SLUS170B.