Texas Instruments CD40174BF3A

Overview

CD40174BF3A from Texas Instruments is a hex D-type flip-flop IC in a 16-lead hermetic ceramic dual-in-line package, operating from −55°C to +125°C, with supply voltage range 3 V to 18 V, and static flip-flop operation enabling synchronous data latching in digital control logic. It serves as a register element in timing-critical industrial sequencers and reset-synchronized state machines.

For engineers reviewing the CD40174BF3A datasheet, CD40174BF3A pinout, CD40174BF3A application, or CD40174BF3A equivalent, key selection criteria include its wide V_DD range, guaranteed propagation delay at 5 V and 15 V, CMOS input compatibility, and hermetic packaging for high-reliability aerospace and defense systems.

Technical Context

The CD40174BF3A implements six independent edge-triggered D-type flip-flops with common clock and master reset inputs, using standard CMOS silicon-gate technology. Each stage features buffered complementary Q and Q̅ outputs, with no internal feedback or preset functionality.

It operates in static mode-no minimum clock frequency required-and supports both positive-edge clocking and asynchronous active-low master reset. Input thresholds are referenced to V_DD/2, ensuring noise immunity across its full supply range.

Key Specifications

Pinout & Package

CD40174BF3A is housed in a 16-lead hermetic ceramic dual-in-line package (CDIP), designated suffix F3A per TI's packaging addendum. The package provides hermetic sealing, gold-plated leads, and MIL-STD-883 compliance for high-reliability applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD40174BM and 74HC174, the CD40174BF3A uniquely combines hermetic ceramic packaging, −55°C to +125°C operation, and 3–18 V flexibility - making it irreplaceable in mission-critical systems where environmental resilience outweighs speed or cost.

Availability

CD40174BF3A is available at Aetrix Electronics and suitable for industrial PLC sequencers, aerospace avionics watchdogs, and military radio control logic requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for CD40174BF3A 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 CMOS design.

The CD4000B series-including CD40174BF3A-was engineered for robust, wide-supply digital logic in industrial, military, and space applications where longevity, temperature resilience, and process stability are mandatory.

FAQ

What is the maximum clock frequency supported by CD40174BF3A?

The CD40174BF3A does not specify a maximum clock frequency in its datasheet because it is a static CMOS device-its operation is defined by propagation delay, not minimum period. At V_DD = 15 V, t_PD ≤ 100 ns, supporting reliable operation up to approximately 5 MHz in typical layouts. For CD40174BF3A, clock edge integrity and layout-induced skew-not internal limits-are the dominant constraints at higher frequencies.

Does CD40174BF3A include Schmitt-trigger inputs?

No, CD40174BF3A does not feature Schmitt-trigger inputs. Its D and CLK inputs follow standard CMOS threshold behavior (V_DD/2 ± 0.5 V) with no hysteresis. This means CD40174BF3A requires clean, monotonic input transitions; slow-rising signals may cause metastability or multiple triggering unless externally conditioned with RC filtering or dedicated Schmitt buffers.

Can CD40174BF3A be used with a 3.3 V supply?

Yes, CD40174BF3A is fully specified down to 3 V, including propagation delay, output drive, and input threshold performance. At 3.3 V, t_PD increases to ~220 ns (max), and output current drops to ±1.5 mA, but all logic functions remain guaranteed. CD40174BF3A thus supports direct integration into mixed-voltage systems alongside 3.3 V microcontrollers when timing budgets permit.

Is CD40174BF3A pin-compatible with CD40174BE?

Yes, CD40174BF3A and CD40174BE share identical pinout, logic function, and electrical specifications-the only differences are package construction (hermetic ceramic vs. plastic DIP) and temperature rating (−55°C to +125°C vs. −55°C to +125°C for both, though BE's plastic variant has lower reliability under thermal shock). CD40174BF3A maintains full functional and mechanical interchangeability with CD40174BE in socketed or through-hole designs.

What is the purpose of the MR̅ pin on CD40174BF3A?

The MR̅ (Master Reset) pin on CD40174BF3A is an active-low asynchronous input that forces all six Q outputs to logic 0 regardless of clock or D-input states. It overrides normal edge-triggered operation and remains effective throughout the entire V_DD operating range. In CD40174BF3A-based systems, MR̅ is commonly tied to power-on reset circuits or system-level fault handlers to ensure deterministic startup and safe recovery.