Texas Instruments UCC37325D

Overview

UCC37325D from Texas Instruments is a dual low-side MOSFET driver with one inverting (OUTA) and one noninverting (OUTB) output channel, delivering ±4-A peak gate drive current at the Miller plateau region, operating from 4.5 V to 15 V supply, and featuring TTL/CMOS-compatible inputs independent of VDD - used in high-frequency DC-DC converters and solar inverter half-bridge gate drive stages.

For engineers reviewing the UCC37325D datasheet, UCC37325D pinout, UCC37325D application, or UCC37325D equivalent, this page delivers verified functional identity, SOIC-8 package mapping, confirmed switching timing (20 ns rise / 15 ns fall @ 1.8 nF), thermal resistance (107.3°C/W), and two validated alternative part options for dual-channel gate drive designs requiring logic-mixed output polarity.

Technical Context

The UCC37325D implements a Bi-CMOS hybrid output stage-parallel bipolar and MOSFET transistors-that sustains ±4-A peak sourcing/sinking capability even at low VDD (4.5 V), enabling robust Miller plateau drive without droop. Its input stage features wide hysteresis and voltage-independent TTL/CMOS thresholds (VIN_H = 1.6–2.5 V, VIN_L = 0.8–1.5 V), ensuring noise immunity across temperature.

Each channel operates independently: INA controls inverting OUTA (for P-channel MOSFETs), INB controls noninverting OUTB (for N-channel MOSFETs); unused inputs must be tied to VDD or GND. Propagation delays are asymmetric-TD1 = 25–40 ns (IN↑→OUT), TD2 = 35 ns (IN↓→OUT)-optimized for synchronous rectifier timing alignment.

Key Specifications

Pinout & Package

UCC37325D uses an 8-pin SOIC (D) package (4.90 mm × 3.91 mm), thermally optimized for surface-mount PCB assembly with standard reflow profiles. The PowerPAD variant (DGN) is not applicable to this specific orderable part.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC27325D, UCC27325D offers identical functionality at extended temperature, while TC4427ACOA trades peak drive strength and Miller-optimized architecture for lower unit cost - making it viable only in low-stress, low-frequency gate drive roles.

Availability

UCC37325D is available at Aetrix Electronics and suitable for switch-mode power supplies, DC-DC converters, and uninterruptible power supplies requiring stable component supply, long-term industrial lifecycle support, and SOIC-8 footprint compatibility.

Supply support for UCC37325D 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in power conversion ICs.

The UCC37325D belongs to the UCCx732x dual MOSFET driver product line, engineered specifically for high-efficiency, high-frequency power supply gate drive where Miller plateau current delivery and logic-mixed output configuration are essential.

FAQ

What is the logic configuration of UCC37325D?

The UCC37325D features one inverting output (OUTA, driven by INA) and one noninverting output (OUTB, driven by INB). This mixed-logic configuration eliminates the need for external inverters in synchronous buck or half-bridge topologies. The truth table confirms OUTA = NOT(INA) and OUTB = INB across all valid input states, with both outputs capable of ±4-A peak current delivery.

Does UCC37325D support paralleling of its two outputs?

Yes, UCC37325D supports paralleling OUTA and OUTB to achieve up to ±8-A peak drive current for single high-gate-charge MOSFETs. TI recommends tying INA and INB together at the IC pad, matching external gate resistors on both paths, and maintaining symmetrical PCB layout to minimize channel mismatch. Input signal slew rate should exceed 20 V/µs to ensure simultaneous switching.

What is the maximum operating junction temperature for UCC37325D?

The UCC37325D is rated for 0°C to +70°C ambient operating temperature, corresponding to a maximum junction temperature of +125°C under typical SOIC-8 thermal conditions (θJA = 107.3°C/W). Derating is required above 50°C ambient if power dissipation exceeds 450 mW; thermal simulation using the provided θJB = 47.3°C/W is recommended for board-level reliability validation.

Can UCC37325D drive N-channel MOSFETs in high-side configurations?

UCC37325D is a low-side driver and cannot directly drive high-side N-channel MOSFETs without external bootstrap or isolated supply circuitry. However, OUTA (inverting) can drive high-side P-channel MOSFETs directly, and both outputs support gate drive for N-channel devices in low-side positions. For high-side N-MOS, pairing UCC37325D with a dedicated high-side driver (e.g., UCC27201) is required.

What bypass capacitors are required for stable UCC37325D operation?

UCC37325D requires two VDD bypass capacitors: a 0.1-µF X7R ceramic capacitor placed within 2 mm of Pin 6 (VDD) and Pin 3 (GND), plus a bulk 1-µF or larger low-ESR capacitor (e.g., tantalum or polymer) connected in parallel. This dual-capacitor network maintains low impedance across 100 kHz–100 MHz, preventing supply rail collapse during 4-A transient current pulses and suppressing switching noise coupling into the input stage.