onsemi SN74LS365AN

Overview

SN74LS365AN from Texas Instruments is a dual 3-state non-inverting buffer/driver IC in a 16-pin PDIP package, operating from 4.75 V to 5.25 V with typical propagation delay of 15 ns and output drive capability of ±24 mA. It serves as a bus interface or data line driver in legacy TTL-based industrial control and instrumentation systems.

For engineers reviewing the SN74LS365AN datasheet, pinout, applications, or equivalent options, this page delivers verified functional identity, confirmed pin assignments, temperature-rated performance (0°C to 70°C), RoHS-compliant NIPDAU lead finish, and validated alternatives for legacy system maintenance and redesign.

Technical Context

The SN74LS365AN implements six independent non-inverting buffer channels, each with separate 3-state enable control (two groups: 1A–3A enabled by 1G, 4A–6A enabled by 2G). All outputs are TTL-compatible and designed for direct connection to standard LS/TTL loads without external pull-ups.

It belongs to the 74LS logic family and maintains strict compatibility with SN74LS365A specifications - including input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), output voltage levels (VOH = 2.7 V min at IOH = –0.4 mA, VOL = 0.5 V max at IOL = 8 mA), and DC noise margin (≥0.4 V).

Key Specifications

Pinout & Package

SN74LS365AN uses a 16-pin plastic dual in-line package (PDIP-N), 0.300-inch wide body, with standard DIP pin spacing (0.100 inch). Pin 1 is marked by a notch or dot; pin numbering follows counterclockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LS365ADR, the SN74LS365AN offers through-hole assembly compatibility and simplified hand-soldering for prototyping or repair, while SN74LS367AN provides functional equivalence with inverted polarity - both preserve the same 15 ns propagation delay, ±24 mA drive, and 0°C–70°C operation required in legacy TTL systems.

Availability

SN74LS365AN is available at Aetrix Electronics and suitable for industrial control, test equipment, and embedded instrumentation requiring stable component supply and long-term obsolescence management.

Supply support for SN74LS365AN 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 with over 90 years of analog and logic IC innovation, serving industrial, automotive, and communications markets.

The SN74LS365AN belongs to TI's legacy 74LS logic product line, engineered specifically for backward compatibility with 1970s–1990s TTL-based systems requiring robust noise immunity, predictable timing, and direct interconnection with standard logic families.

FAQ

What is the function of the 1G and 2G pins on the SN74LS365AN?

The 1G and 2G pins are active-low enable inputs controlling two independent groups of three buffers each. When 1G is LOW, outputs Y1–Y3 follow inputs 1A–3A; when HIGH, they enter high-impedance state. Similarly, 2G controls Y4–Y6. This allows selective bus isolation in multi-module systems without requiring additional logic gates. The SN74LS365AN uses these enables to prevent signal contention on shared data paths.

Can SN74LS365AN be used in place of SN74LS365N?

Yes - SN74LS365AN is the RoHS-compliant, NIPDAU-finished successor to SN74LS365N, with identical pinout, electrical specifications, timing, and thermal ratings (0°C to 70°C). Both share the same PDIP-16 package and functional behavior. The SN74LS365AN replaces SN74LS365N in new builds and repairs where lead-free compliance is required, with no design or layout changes needed.

What is the maximum capacitive load the SN74LS365AN can drive reliably?

The SN74LS365AN is characterized for loads up to 15 pF per output, consistent with standard LS-TTL loading conditions. Driving >20 pF increases propagation delay nonlinearly and may cause marginal timing in high-speed buses. For heavier loads (e.g., >50 pF), TI recommends adding series termination or using a dedicated line driver. The SN74LS365AN's 15 ns typical delay assumes CL = 15 pF and RL = 1 kΩ.

Does SN74LS365AN support mixed-voltage interfacing (e.g., with 3.3 V logic)?

No - SN74LS365AN is strictly a 5 V TTL device. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output levels (VOH ≈ 2.7 V, VOL ≈ 0.4 V) are incompatible with 3.3 V CMOS logic without level translation. Direct connection risks incorrect logic interpretation or excessive input current. For 3.3 V system integration, use a dedicated level shifter or select a 3.3 V–tolerant buffer such as SN74LVC244A instead of SN74LS365AN.

Is there a military-grade version of SN74LS365AN?

Yes - the SN54LS365AJ is the qualified military-grade variant, packaged in CDIP-16, rated for –55°C to +125°C, and compliant with MIL-PRF-38535 Class B requirements. It shares identical logic function, pinout, and DC/AC electrical characteristics with SN74LS365AN but undergoes extended screening and lot traceability. SN54LS365AJ is not a drop-in replacement due to different temperature range and packaging; system validation is required before substitution. SN74LS365AN itself is commercial-grade only.