onsemi 74HCT32DTR2G

Overview

74HCT32DTR2G from onsemi is a quad 2-input OR gate with TTL-compatible inputs, fabricated in high-performance silicon-gate CMOS. It operates from 4.5 V to 5.5 V, delivers ±4.0 mA output drive, exhibits 22 ns max propagation delay at 125°C, and supports industrial temperature range (−55°C to +125°C). It is used in digital logic interfacing, bus arbitration, and level translation between LSTTL and CMOS systems.

For engineers reviewing the 74HCT32DTR2G datasheet, pinout, applications, or equivalent options, key selection criteria include its TSSOP-14 Pb-free package, guaranteed VIH/VIL thresholds (2.0 V/0.8 V), low input leakage (±1.0 µA), and JEDEC Std. 7A compliance for interoperability with legacy TTL systems.

Technical Context

The 74HCT32DTR2G implements four independent OR gates (Y = A + B) using CMOS technology with buffered TTL-compatible input stages. Its input threshold levels (VIH = 2.0 V min, VIL = 0.8 V max) ensure reliable recognition of LSTTL logic states across full temperature and voltage ranges.

Each gate provides rail-to-rail CMOS output swing with VOH ≥ 4.4 V and VOL ≤ 0.40 V under 4.0 mA load, enabling direct interface to CMOS, NMOS, and TTL loads. Propagation delay (tPLH/tPHL ≤ 22 ns) and transition time (tTLH/tTHL ≤ 22 ns) are specified at CL = 50 pF and VCC = 4.5 V up to +125°C.

Key Specifications

Pinout & Package

TSSOP-14 (Case 948G), Pb-free, 4.9 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input OR gate applications.

Compared with SN74HCT32PW and MC74HCT32AD, the 74HCT32DTR2G offers identical logic functionality and timing but differs in manufacturer qualification, tape-and-reel packaging (2500 pcs/reel), and Pb-free process certification per onsemi's QM-300 standard - critical for aerospace and medical OEMs requiring full material traceability.

Availability

74HCT32DTR2G is available at Aetrix Electronics and suitable for industrial PLC logic modules, automotive body control units, and legacy system upgrades requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 74HCT32DTR2G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, medical, and IoT applications.

The 74HCT32DTR2G belongs to the HCT logic family designed specifically for TTL-to-CMOS bridging in mixed-technology systems, emphasizing interoperability, wide temperature operation, and legacy design compatibility.

FAQ

What is the maximum propagation delay of the 74HCT32DTR2G at full temperature range?

The 74HCT32DTR2G has a maximum propagation delay (tPLH/tPHL) of 22 ns when measured at VCC = 4.5 V, CL = 50 pF, and TA = +125°C. This value is guaranteed across the full operating temperature range (−55°C to +125°C) and reflects worst-case performance for timing-critical logic paths in industrial environments.

Does the 74HCT32DTR2G require external pull-up resistors on unused inputs?

No - unused inputs on the 74HCT32DTR2G must be tied to a valid logic level (VCC or GND), not left floating, but no external pull-up resistors are required. The device's TTL-compatible input structure ensures stable logic states when directly connected to supply rails, eliminating need for biasing components and reducing BOM count.

Is the 74HCT32DTR2G pin-compatible with the original 74LS32?

Yes - the 74HCT32DTR2G is identical in pinout to the 74LS32 and shares the same 14-pin TSSOP layout. All inputs and outputs map one-to-one, enabling direct replacement in existing designs without PCB modification, provided the 5 V supply and thermal environment meet HCT specifications.

What is the output drive capability of the 74HCT32DTR2G under industrial conditions?

The 74HCT32DTR2G guarantees ±4.0 mA output drive per gate at VCC = 4.5 V and TA = +125°C, sufficient to drive 10 LSTTL loads. This rating ensures reliable fan-out in harsh environments where bipolar LS devices would exhibit degraded performance or excessive power dissipation.

Can the 74HCT32DTR2G operate from a 3.3 V supply?

No - the 74HCT32DTR2G is specified only for 4.5 V to 5.5 V operation. Its TTL-compatible input thresholds (VIH = 2.0 V min) and output voltage levels (VOH ≥ 4.4 V) are optimized for 5 V systems. For 3.3 V logic, consider the 74AHCT32 or 74LVC32 families instead.