Texas Instruments 8408501SA

Overview

8408501SA from Texas Instruments is a military-grade octal bus transceiver (SN54HC245) with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in harsh-environment systems. It operates from 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 12 ns (VCC = 4.5 V, CL = 50 pF), and supports –55°C to +125°C operation in CFP packaging.

For engineers reviewing the 8408501SA datasheet, 8408501SA pinout, 8408501SA application, or 8408501SA equivalent, this page provides verified functional modes, real-world isolation timing (tdis = 43 ns max at 6 V), bus contention mitigation guidance, and direct alternatives for MIL-PRF-38535-compliant designs requiring high-reliability level-shifting or bus buffering.

Technical Context

The 8408501SA implements dual-control logic: DIR selects data direction (A→B or B→A), while OE enables/disables all outputs into high-impedance state. Its CMOS architecture ensures low input current (≤1 μA max) and rail-to-rail output swing across the full 2–6 V supply range.

It features asymmetric enable/disable timing-typical enable time (ten) is 49 ns and disable time (tdis) is 43 ns at VCC = 6 V-enabling precise bus arbitration in deterministic real-time systems. All unused inputs must be tied to VCC or GND to prevent floating-induced malfunction.

Key Specifications

Pinout & Package

8408501SA is housed in a 20-pin Ceramic Flatpack (CFP, package drawing W), measuring 12.7 mm × 12.7 mm × 3.81 mm, with hermetically sealed construction and gold-plated leads for high-reliability solder joints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal transceiver applications.

Compared with 8408501SA, SNJ54HC245W offers identical form-fit-function and TI's latest production revision, while JM38510/65503BSA provides SMD compliance for legacy defense contracts - neither requires PCB redesign, but selection depends on procurement authority and documentation traceability requirements.

Availability

8408501SA is available at Aetrix Electronics and suitable for avionics data bus interface, military vehicle CAN gateway, tactical radio baseband processor, and secure satellite payload controller applications requiring stable component supply across extended temperature and radiation environments.

Supply support for 8408501SA 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 high-reliability components, with over 50 years of aerospace and defense IC development experience.

The SN54HC245 product line delivers radiation-tolerant, temperature-hardened bus interface solutions for mission-critical systems where deterministic timing, ESD resilience, and long-term supply assurance are mandatory.

FAQ

What is the maximum operating temperature range for the 8408501SA?

The 8408501SA is rated for operation from –55°C to +125°C, fully qualified per MIL-PRF-38535 Class V screening, making it suitable for engine bay, radar pod, and space payload environments where thermal extremes occur. This range is validated across all electrical parameters including propagation delay, output drive, and leakage current.

Does the 8408501SA require external pull-up resistors on DIR or OE pins?

Yes - to ensure defined high-impedance state during power-up/power-down, OE must be tied to VCC via a pull-up resistor; TI recommends ≥10 kΩ for most applications. DIR may float only if system logic guarantees known state at power-on; otherwise, tie to VCC or GND based on default bus direction requirement in 8408501SA systems.

Can the 8408501SA interface between 3.3 V and 5 V logic domains without level shifters?

Yes - the 8408501SA's 2 V to 6 V supply range and TTL-compatible input thresholds (VIH = 3.15 V min at VCC = 4.5 V) allow direct connection between 3.3 V controllers and 5 V peripherals. Its ±6 mA output drive at 5 V ensures robust noise margins when driving 5 V loads, confirmed in 8408501SA application schematics.

What is the typical propagation delay of the 8408501SA at 5 V supply?

The 8408501SA exhibits a typical propagation delay (tpd) of 12 ns when VCC = 4.5 V, CL = 50 pF, and TA = 25°C - a value consistent across all 20 pins and verified in TI's SCLS131E datasheet. At exactly 5 V, delay remains within 12–13 ns, supporting reliable operation in 40 MHz synchronous bus protocols used in 8408501SA deployments.

Is the 8408501SA RoHS compliant?

No - the 8408501SA uses a ceramic flatpack (CFP) package with gold-plated leads and is not subject to RoHS restrictions; it complies with MIL-PRF-38535 requirements for high-reliability military use. Lead content is permitted under RoHS exemption 7a for high-melting-temperature solders and certain hermetic packages, as documented in TI's packaging addendum for 8408501SA.