Texas Instruments UC3714DTR

Overview

UC3714DTR 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 converters.

For engineers reviewing the UC3714DTR datasheet, UC3714DTR pinout, UC3714DTR application, or UC3714DTR equivalent, this page delivers verified timing delay behavior, zero-voltage sensing capability via T1/T2 pins, SOIC-8 package compatibility, and design-critical propagation delay specs (e.g., 35–100 ns PWR prop delay) needed for soft-switching power stage layout and gate-drive timing validation.

Technical Context

The UC3714DTR implements dual-output complementary drive with independent delay control: T1 sets AUX-to-PWR turn-on delay (50–500 ns), while T2 sets PWR-to-AUX turn-off delay (50–500 ns). Its internal timing circuitry uses resistor-programmed current sources with nominal 3-V threshold at T1/T2 pins and ±1 mA current limiting.

It supports true zero-voltage operation - pulling T1 or T2 below 2.5 V immediately triggers corresponding output activation - and includes passive self-biased logic that forces PWR low during ENBL ≤0.8 V, regardless of VCC. Propagation delays are measured from 50% input to 10% output transition under 2200-pF load (PWR) or 1000-pF load (AUX).

Key Specifications

Pinout & Package

UC3714DTR is housed in an 8-pin SOIC (D package), RoHS-compliant with CU NIPDAU finish and JEDEC Level-2 moisture sensitivity rating (250°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UC2714DTR, UC3714DTR trades thermal range for cost-optimized commercial qualification; compared with UC3715DTR, it provides inverted AUX output essential for p-channel clamp FETs - making UC3714DTR the only choice for active-clamp forward topologies using single-supply gate drive.

Availability

UC3714DTR is available at Aetrix Electronics and suitable for forward converters, synchronous rectifiers, active-clamp flybacks, and self-sleeping AC-DC adapters requiring stable component supply and guaranteed long-term sourcing.

Supply support for UC3714DTR 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 50 years of innovation in power conversion ICs.

The UC3714DTR belongs to TI's legacy complementary FET driver family, engineered specifically for zero-voltage switching topologies including forward, flyback, and resonant converters - emphasizing timing precision, gate-drive robustness, and system-level efficiency optimization.

FAQ

What is the maximum switching frequency supported by UC3714DTR?

The UC3714DTR is characterized for operation up to 1 MHz, as confirmed in its Electrical Characteristics table. This capability stems from its typical 35–100 ns PWR propagation delay and 30–60 ns rise/fall times under 2200-pF load. At 1 MHz, minimum achievable dead time (50 ns) occupies just 5% of the switching period, enabling efficient high-frequency designs such as compact USB PD adapters and PoE-powered equipment.

How does UC3714DTR implement zero-voltage switching without external sensors?

The UC3714DTR implements zero-voltage switching through its T1 and T2 pins, which feature true zero-voltage sensing capability. When either pin is pulled below 2.5 V - for example, by a resistor divider monitoring MOSFET drain voltage - the corresponding output (AUX or PWR) activates immediately. This eliminates external comparators and enables direct, low-latency ZVS detection in active-clamp and synchronous rectifier circuits using UC3714DTR alone.

Is UC3714DTR pin-compatible with UC2714DTR or UC3715DTR?

Yes, UC3714DTR shares identical SOIC-8 pinout and electrical interface with both UC2714DTR and UC3715DTR. All three devices use the same pin assignments for VCC, GND, INPUT, AUX, ENBL, PWR, T1, and T2. However, UC3714DTR and UC3715DTR differ functionally: UC3714DTR provides inverted AUX output (for p-channel FETs), while UC3715DTR offers true complementary (non-inverted) outputs - a functional distinction requiring schematic review before substitution.

What is the purpose of the ENBL pin in UC3714DTR, and how does it affect PWR output behavior?

The ENBL pin on UC3714DTR controls entry into a low-power sleep mode. When ENBL ≤0.8 V, UC3714DTR draws only 220 μA and forces the PWR output into a passive, self-biased low state - regardless of VCC voltage or INPUT signal. This ensures fail-safe shutdown of the main power switch during standby. Meanwhile, AUX enters high-impedance state, preventing unintended gate drive. This behavior is explicitly defined in the PIN DESCRIPTIONS section of the SLUS170B datasheet.

Can UC3714DTR drive both N-channel and P-channel MOSFETs directly?

Yes - UC3714DTR is designed to drive either type directly. Its AUX output is inverted relative to INPUT, making it ideal for driving p-channel MOSFETs in active-clamp configurations without level shifters. The PWR output is non-inverted and rated for 1-A source / 2-A sink, suitable for driving N-channel MOSFETs in main power switches. Both outputs operate from the same VCC rail (7–20 V), eliminating need for floating supplies or charge pumps in many topologies.