Texas Instruments SN74ABT2827NT

Overview

SN74ABT2827NT from Texas Instruments is a 10-bit noninverting buffer/driver with 3-state outputs, designed for high-speed bus interface in wide data paths carrying parity. It operates from 4.5 V to 5.5 V, supports –40°C to 85°C ambient temperature, features integrated 25-Ω output series resistors, and delivers ±12 mA drive capability per output - used in industrial backplane and memory subsystem buffering.

For engineers reviewing the SN74ABT2827NT datasheet, SN74ABT2827NT pinout, SN74ABT2827NT application, or SN74ABT2827NT equivalent, key selection criteria include dual active-low 3-state enable control (OE1/OE2), flow-through pinout for PCB layout optimization, latch-up immunity >500 mA, ground bounce <1 V at 5 V, and compatibility with TTL-level inputs and 5-V CMOS loads.

Technical Context

This device implements a true (noninverting) logic function with two independent active-low 3-state enable inputs (OE1 and OE2) wired as a 2-input AND gate: both must be low for outputs to drive; either high forces all ten Y outputs into high-impedance. Its EPIC-II^B BiCMOS process enables low power dissipation while maintaining TTL-compatible input thresholds and 5-V CMOS output swing.

The outputs integrate on-die 25-Ω series termination to suppress transmission-line overshoot/undershoot without external resistors. Propagation delays are tightly controlled: t_PLH/t_PHL ≤ 5.5 ns at V_CC = 5 V, CL = 50 pF, and enable/disable times (t_PZH, t_PZL, t_PHZ, t_PLZ) range from 1 ns to 7.8 ns under same conditions.

Key Specifications

Pinout & Package

SN74ABT2827NT is supplied in a 24-pin plastic DIP (Dual In-line Package) with through-hole mounting and standard 0.3-inch body width. Pin 1 is located at the top-left corner when the notch faces upward.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit 3-state buffer applications.

Compared with SN74ABT244N and SN74ACT244N, the SN74ABT2827NT provides exact 10-bit alignment, eliminates external termination components, and delivers superior noise immunity via lower VOLP - making it optimal for parity-aware or fixed-width bus architectures where pin count and layout simplicity are critical.

Availability

SN74ABT2827NT is available at Aetrix Electronics and suitable for industrial backplane buffering, memory subsystem interfacing, parity bus extension, and legacy ISA bus repeater applications requiring stable component supply and long-term obsolescence management.

Supply support for SN74ABT2827NT 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 logic solutions, with decades of heritage in high-reliability logic families.

The ABT logic family - including SN74ABT2827NT - was engineered for high-speed, low-noise 5-V bus interfacing in industrial and computing systems, emphasizing signal integrity, latch-up immunity, and layout efficiency.

FAQ

What is the recommended power-up sequence for SN74ABT2827NT to avoid bus contention?

To prevent unintended output activation during power-up, tie both OE1 and OE2 to V_CC through a pullup resistor. TI specifies a minimum resistance determined by the driver's current-sinking capability - typically 4.7 kΩ suffices for most 5-V systems. This ensures all outputs remain in high-impedance until firmware asserts valid enable signals. The SN74ABT2827NT does not include internal power-on reset, so external enable conditioning is required for robust initialization.

Does SN74ABT2827NT support mixed-voltage interfacing, such as 3.3-V inputs driving a 5-V bus?

No - SN74ABT2827NT is a 5-V-only device with TTL-compatible input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and requires V_CC = 4.5–5.5 V. It does not tolerate 3.3-V logic levels on its A inputs without level translation, as VIH minimum is 2.0 V and sustained input voltages below that may cause undefined output states or increased ICC. For mixed-voltage systems, use dedicated level translators upstream of the SN74ABT2827NT.

Can SN74ABT2827NT outputs be paralleled for higher current drive?

No - paralleling outputs of SN74ABT2827NT is not recommended. Its 3-state control is synchronous across all ten channels, but propagation delays vary slightly (±0.5 ns typical), risking shoot-through current or bus contention during transitions. TI specifies maximum per-pin output current as ±12 mA; exceeding this risks thermal overstress or accelerated wear. Use a single SN74ABT2827NT per 10-bit segment or select higher-drive alternatives like SN74ABT162244 for scalable current needs.

What is the thermal performance of SN74ABT2827NT in the NT package?

The SN74ABT2827NT in its 24-pin plastic DIP (NT) package has a junction-to-ambient thermal resistance (θ_JA) of 67°C/W under standard JEDEC test conditions. At full 10-bit drive (12 mA × 10 pins), worst-case power dissipation is ~150 mW, resulting in ~10°C junction rise above ambient - well within safe operating limits. No heatsink is required for typical industrial airflow, but board layout should avoid enclosing the NT package under shields or near high-power components.

Is SN74ABT2827NT RoHS compliant and lead-free?

Yes - SN74ABT2827NT is RoHS compliant and features lead-free (Pb-free) finish per TI's packaging documentation. The NT package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity Level 1 (unlimited floor life at ≤30°C/60% RH). Full compliance documentation, including material declarations and test reports, is available via TI's Quality & Environmental page using the orderable part number SN74ABT2827NT.