Texas Instruments 8408901FA

Overview

8408901FA from Texas Instruments is a military-grade quad D-type positive-edge-triggered flip-flop with complementary outputs and direct asynchronous clear (CLR), operating across −55°C to 125°C, supporting 2 V to 6 V supply, delivering ±4-mA output drive at 5 V, and achieving typical propagation delay of 13 ns - used in radiation-tolerant shift registers and pattern generators for aerospace telemetry systems.

For engineers reviewing the 8408901FA datasheet, 8408901FA pinout, 8408901FA application, or 8408901FA equivalent, this page delivers verified functional identity, CFP package mapping, timing parameters under military temperature range, and validated alternative options for high-reliability digital logic design.

Technical Context

The 8408901FA implements four independent D-type flip-flops sharing a common clock (CLK) and asynchronous clear (CLR) input, each providing true (Q) and complement (Q̅) outputs. It uses silicon-gate CMOS technology with double-rail output structure, enabling simultaneous access to both logic states per stage without external inverters.

Triggering occurs on the positive-going edge of CLK; data at D inputs must meet setup (tsu = 21 ns @ 6 V) and hold (th = 0 ns) requirements. CLR overrides clock and forces all Q outputs low regardless of CLK or D state - critical for system reset synchronization in avionics control sequencers.

Key Specifications

Pinout & Package

8408901FA is housed in a 16-pin Ceramic Flatpack (CFP-W) package with gull-wing leads, hermetically sealed for high-reliability environments. Pin spacing is 0.05 inch (1.27 mm), body dimensions are 0.55 × 0.35 inch (13.97 × 8.89 mm), and thermal resistance θJA is not specified due to conduction-cooled mounting convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad D-type flip-flop applications.

Compared with 8408901FA, SNJ54HC175J offers easier hand-soldering and socket use but sacrifices thermal performance in conduction-cooled chassis mounts, while SNJ54HC175FK improves high-frequency noise rejection at the cost of more complex assembly and no leaded inspection access.

Availability

8408901FA is available at Aetrix Electronics and suitable for aerospace telemetry encoders, avionics control sequencers, satellite watchdog timers, and military radar pulse generators requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 8408901FA 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 U.S.-based semiconductor manufacturer founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.

The SN54HC175 product line delivers radiation-tolerant, temperature-hardened CMOS logic for mission-critical aerospace and defense systems where deterministic timing and long-term parametric stability are mandatory.

FAQ

What is the absolute maximum supply voltage rating for the 8408901FA?

The 8408901FA has an absolute maximum supply voltage (VCC) rating of −0.5 V to +7 V. Operation beyond 6 V is not recommended under normal conditions, as the recommended operating range is 2 V to 6 V per the datasheet. Exceeding 7 V risks permanent damage to the internal oxide layers, even momentarily. Always observe derating guidelines for transient spikes in harsh-environment deployments.

Does the 8408901FA support hot insertion or live insertion into a powered backplane?

No, the 8408901FA does not support hot insertion. Its absolute maximum ratings do not include I/O voltage limits during power-up sequencing, and the CFP-W package lacks built-in hot-swap protection circuitry. Applying VCC before establishing proper GND connection or driving inputs before power stabilization may cause latch-up or parametric shift. System-level hot-swap capability must be implemented externally using dedicated controllers and current-limiting circuitry.

Can the 8408901FA be used as a divide-by-two counter?

Yes, the 8408901FA can be configured as a divide-by-two counter by connecting Q̅ to D and using CLK as input. This creates a toggle flip-flop with 50% duty-cycle output. The guaranteed 0 ns hold time and 21 ns setup time at 6 V ensure stable toggling up to 25 MHz. However, cascading multiple stages requires careful skew management due to cumulative propagation delay - verified timing margins must be calculated per MIL-HDBK-217F.

Is the 8408901FA compliant with RoHS or green packaging standards?

The 8408901FA is not RoHS-compliant. As a CFP-W packaged military-grade device manufactured to MIL-PRF-38535, it contains leaded solder finishes and exempted materials per EU Directive 2011/65/EU Annex III. TI classifies it under "RoHS Exempt" status, confirmed in the Package Option Addendum. For RoHS-compliant alternatives, consider commercial-grade SN74HC175 variants in SOIC or TSSOP packages.

What is the meaning of "double-rail outputs" in the 8408901FA datasheet description?

"Double-rail outputs" refers to the provision of both true (Q) and complement (Q̅) outputs from each of the four internal D-type flip-flops in the 8408901FA. This eliminates the need for external inverters when differential signaling, set/reset latching, or complementary bus driving is required - reducing component count, propagation delay, and layout area in high-integrity digital systems such as flight control computers.