Texas Instruments SN75374N

Overview

SN75374N from Texas Instruments is a quadruple NAND gate driver IC designed to interface TTL logic with power MOSFET gates in high-speed switching applications. It features three independent supply rails (VCC1 = 5 V, VCC2 = 4.75–24 V, VCC3 = VCC2 to 28 V), delivers ±40 mA output drive capability per channel, and achieves propagation delays as low as 10 ns at 200 pF load - enabling fast charging of MOSFET input capacitance up to 4000 pF in motor control and SMPS gate-drive circuits.

For engineers reviewing the SN75374N datasheet, SN75374N pinout, SN75374N application, or SN75374N equivalent, key selection considerations include its triple-supply architecture for rail-to-rail output swing, standby current below 0.5 mA per supply, thermal impedance of 67°C/W in PDIP package, and compatibility with industrial temperature range (0°C to 70°C) for embedded power-control designs.

Technical Context

The SN75374N implements four independent totem-pole output stages, each with dual enable inputs (E1/E2) and one data input (A), operating under separate supply domains: VCC1 powers TTL-level input logic, VCC2 sets the output pull-down rail, and VCC3 sets the output pull-up rail - allowing VOH to reach within 0.1 V of VCC2 when VCC3 ≥ VCC2 + 3 V. Each channel supports peak output currents up to 500 mA (10 ms pulse, 50% duty cycle) and drives capacitive loads up to 4000 pF without external components.

Its logic function is positive-true NAND: Y = NOT(A AND E1 AND E2). Input thresholds are VIH = 2 V (min) and VIL = 0.8 V (max) referenced to VCC1 ground; output voltage levels are defined relative to VCC2 ground, with VOL ≤ 0.5 V at IOL = 40 mA and VOH ≥ VCC2 − 1.3 V at IOH = −10 mA - ensuring robust noise margin when driving MOSFET gates across wide supply ranges.

Key Specifications

Pinout & Package

SN75374N is supplied in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width, through-hole mounting, and industry-standard pin spacing (0.1 inch). The package provides adequate thermal performance for moderate-power gate-driving applications without heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar gate-driver applications.

Compared with UCC37324P and TC4427ACPE, the SN75374N uniquely supports triple-supply operation for rail-to-rail gate drive up to 24 V, integrates dual hardware enables per channel for fault-safe H-bridge control, and maintains sub-60 ns propagation delay across industrial temperature range - making it irreplaceable in high-reliability 24-V motor and power-conversion systems.

Availability

SN75374N is available at Aetrix Electronics and suitable for motor control, switch-mode power supply, industrial PLC output modules, and DC motor H-bridge interfaces requiring stable component supply across extended production lifecycles.

Supply support for SN75374N 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 for industrial, automotive, and communications markets.

The SN75374N belongs to TI's legacy logic driver product line, engineered specifically for high-speed, high-capacitance gate-driving applications in industrial power electronics - emphasizing robustness, triple-supply flexibility, and direct TTL compatibility.

FAQ

What is the maximum capacitive load the SN75374N can drive reliably?

The SN75374N is characterized to drive up to 4000 pF loads with controlled rise/fall times (<100 ns) and stable operation, as verified in Figure 15 and Figure 10–11 of the SLRS028A datasheet. For loads exceeding 2000 pF, RD = 0 Ω operation violates absolute maximum current rating; therefore, a series gate resistor (e.g., 10–24 Ω) is recommended to limit peak current and ensure reliability. The SN75374N itself does not require external components for basic operation but benefits from proper PCB layout and local decoupling on all three supply pins.

Can the SN75374N operate with VCC3 tied directly to VCC2?

Yes, the SN75374N supports direct connection of VCC3 to VCC2 when full rail-to-rail output swing is not required. In this configuration, VOH is specified as VCC2 − 1.0 V (min) at IOH = −50 µA and VCC2 − 2.5 V (min) at IOH = −10 mA - sufficient for many 12-V or 15-V MOSFET applications. However, for 24-V systems requiring VOH > 23 V, VCC3 must be ≥ VCC2 + 3 V. The SN75374N datasheet explicitly confirms this dual-mode operation in the "description" section and electrical characteristics table.

What is the purpose of the dual enable inputs (E1 and E2) on each SN75374N channel?

The dual enable inputs (E1 and E2) implement a 3-input NAND logic function (Y = NOT(A AND E1 AND E2)) per channel, enabling hardware-level interlocking for safety-critical applications. For example, in an H-bridge, E1 can be driven by a system enable signal and E2 by a fault flag - ensuring that any fault condition forces all outputs LOW regardless of input A state. This eliminates reliance on software-based protection and prevents shoot-through in motor drivers. The SN75374N's architecture makes this dual-enable feature intrinsic and electrically immediate.

Does the SN75374N require external pull-up or pull-down resistors on its outputs?

No, the SN75374N features true totem-pole (push-pull) outputs capable of both sourcing current from VCC3 and sinking current to VCC2, eliminating the need for external pull-up resistors. Its outputs are fully active - unlike open-collector or open-drain drivers - and deliver rail-aligned logic levels without compromise. This is confirmed in the "logic diagram", "schematic", and "electrical characteristics" sections of the SN75374N datasheet, which specify VOH and VOL under loaded conditions with no external components.

How does thermal management differ between the SN75374N (PDIP) and SN75374D (SOIC)?

The SN75374N in PDIP package has a junction-to-ambient thermal resistance (θJA) of 67°C/W, while the SOIC version (SN75374D) is rated at 73°C/W - making the PDIP variant slightly more thermally efficient in still-air conditions. Both packages require adequate copper pour and decoupling, but the SN75374N's through-hole leads offer better mechanical stability and heat conduction into PCB planes. For continuous 500-mW operation, the SN75374N reaches ~112°C junction temperature at 70°C ambient - within its 150°C TJ(max) limit. Derating is advised above 70°C ambient.