onsemi DM81LS95AN

Overview

DM81LS95AN from Fairchild Semiconductor is a low-power-Schottky TTL 3-STATE octal buffer with true (non-inverting) output logic, common dual-input NOR enable control (G1/G2), and 20-pin PDIP package. It delivers 15 ns typical propagation delay, 80 mW typical power dissipation, and operates across 0°C to +70°C. It is used in bus interface and data routing applications where output isolation and logic-level signal buffering are required.

For engineers reviewing the DM81LS95AN datasheet, pinout, applications, or equivalent options, key selection criteria include its non-inverting 3-STATE behavior, common enable architecture, TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), and PDIP-20 mechanical form factor for through-hole prototyping and legacy industrial systems.

Technical Context

The DM81LS95AN implements eight independent two-input buffers, where one input per buffer serves as data (A1–A8) and the other as an active-low enable path gated through a shared 2-input NOR structure (G1, G2). Outputs Y1–Y8 enter high-impedance state when either G1 or G2 is HIGH.

It adheres to standard LS-TTL DC specifications: VOH ≥ 2.7 V at I_OH = −5.2 mA, VOL ≤ 0.5 V at I_OL = 24 mA, and supports V_CC = 4.75–5.25 V operation with guaranteed performance over 0°C to +70°C ambient.

Key Specifications

Pinout & Package

DM81LS95AN is housed in a 20-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide, with through-hole mounting and standard 0.1" pin pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal non-inverting buffer applications.

Compared with SN74LS244N and 74ACT244PC, the DM81LS95AN offers identical TTL-compatible enable architecture and proven reliability in legacy industrial environments, while avoiding the voltage-level mismatch risks of ACT devices and preserving design continuity where LS-family timing and drive strength are critical.

Availability

DM81LS95AN is available at Aetrix Electronics and suitable for bus interface buffering, microcontroller I/O expansion, legacy system repair, and test equipment signal conditioning requiring stable component supply and long-lifecycle support.

Supply support for DM81LS95AN 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, power management, and logic families before its acquisition by ON Semiconductor in 2016.

The DM81LS95AN belongs to Fairchild's LS-TTL logic family, designed specifically for robust, low-power, medium-speed digital interfacing in commercial-grade industrial and instrumentation systems.

FAQ

What is the function of G1 and G2 on the DM81LS95AN?

G1 and G2 are active-LOW enable inputs wired internally to a NOR gate. Both must be LOW to enable all eight outputs (Y1–Y8); if either G1 or G2 is HIGH, all outputs enter high-impedance state. This architecture allows flexible enable control using inverted logic signals from microcontrollers or bus controllers. The DM81LS95AN relies on this dual-input NOR enable to provide fail-safe output isolation in multi-master bus systems.

Is the DM81LS95AN pin-compatible with the SN74LS244N?

Yes, the DM81LS95AN is fully pin-compatible with the SN74LS244N: both use 20-pin PDIP (N20A), share identical pin assignments for A1–A8, Y1–Y8, G1, G2, V_CC, and GND, and implement the same non-inverting 3-STATE logic with common NOR-gated enable. Electrical parameters-including V_IL, V_IH, I_OL, and propagation delay-are within mutual specification limits, making DM81LS95AN a functional and mechanical drop-in alternative in existing SN74LS244N designs.

What is the maximum output current capability of the DM81LS95AN?

The DM81LS95AN provides 24 mA sink current (I_OL) and −5.2 mA source current (I_OH) per output under recommended operating conditions (V_CC = 4.75–5.25 V, T_A = 0–70°C). These values are guaranteed minimums per the datasheet's DC Electrical Characteristics table. This drive strength allows direct interfacing with up to 10 LS-TTL inputs or resistive loads such as LEDs and small relays without external amplification-key for the DM81LS95AN's role in I/O expansion and bus driving.

Does the DM81LS95AN support operation at 3.3 V?

No, the DM81LS95AN is specified only for 4.75–5.25 V V_CC operation and is not rated for 3.3 V supply. Its TTL input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and internal Schottky-clamped transistor design require 5 V nominal rail compliance. Attempting 3.3 V operation results in undefined logic states, degraded noise margins, and potential failure to meet propagation delay or output drive specs. For 3.3 V systems, consider 74LVC244 or similar CMOS alternatives-not the DM81LS95AN.

What is the thermal operating range of the DM81LS95AN?

The DM81LS95AN is characterized for free-air operating temperature from 0°C to +70°C, as defined in the Recommended Operating Conditions table. This commercial-grade rating applies to continuous operation under normal load and airflow conditions. The device's 80 mW typical power dissipation remains within safe limits across this range when mounted on standard FR-4 PCBs with minimal copper pour. Extended operation outside 0–70°C is not guaranteed and may impact timing, noise immunity, or long-term reliability of the DM81LS95AN.