Texas Instruments CD40175BEG4

Overview

CD40175BEG4 from Texas Instruments is a quad D-type flip-flop IC with independent clock and reset inputs per latch, 16-pin PDIP package, ±5 V to ±18 V supply range, propagation delay of 120 ns at 5 V, and operation from –55°C to +125°C. It serves as a synchronous storage element in digital control logic, state machines, and data latching circuits.

For engineers reviewing the CD40175BEG4 datasheet, CD40175BEG4 pinout, CD40175BEG4 application, or CD40175BEG4 equivalent, key selection criteria include supply voltage tolerance, latch independence, reset behavior, temperature range compliance, and legacy through-hole compatibility for industrial control upgrades.

Technical Context

The CD40175BEG4 implements four edge-triggered D-type latches sharing a common power domain but featuring individual asynchronous master reset (MR) and clock (CLK) inputs per latch. Each latch has true and complemented Q outputs, enabling direct use in toggle or register configurations without external inversion.

It operates across the full CD4000B series voltage range (3 V to 18 V for single-supply, ±1.5 V to ±9 V for dual-supply), with input thresholds referenced to VDD/VSS, and exhibits noise immunity up to 45% of VDD due to CMOS threshold design. The device is not clock-gated and requires clean, monotonic clock edges for reliable triggering.

Key Specifications

Pinout & Package

CD40175BEG4 is supplied in a 16-lead plastic dual-in-line package (PDIP-N), 19.1 mm × 6.6 mm body, 2.54 mm lead pitch, through-hole mountable with standard 0.635 mm diameter holes. Pin 1 is located at the left end of the top row, identified by a notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD40175BEG4, CD40175BM96 offers identical functionality in surface-mount form for volume manufacturing, while CD40175BPWR provides further footprint reduction at the cost of soldering complexity - both retain full electrical compatibility but differ strictly in mechanical implementation.

Availability

CD40175BEG4 is available at Aetrix Electronics and suitable for industrial sequence control, legacy system data capture, power-up state initialization, and LED pattern sequencer applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD40175BEG4 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 company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial, automotive, and aerospace qualification programs.

The CD4000B series - including CD40175BEG4 - was designed for robust, low-power digital logic in harsh environments where reliability, wide voltage operation, and temperature resilience outweigh speed requirements.

FAQ

What is the maximum clock frequency supported by the CD40175BEG4?

The CD40175BEG4 does not specify a maximum clock frequency in its datasheet; instead, it specifies propagation delay (120 ns max at VDD = 5 V). This implies reliable operation up to approximately 8 MHz under nominal conditions. Actual usable frequency depends on setup/hold timing margins, load capacitance, and supply voltage - for example, at VDD = 15 V, propagation delay improves to ~50 ns, supporting higher rates. Always verify timing with worst-case VDD, temperature, and capacitive loading in your layout.

Does the CD40175BEG4 support dual-supply operation?

Yes, the CD40175BEG4 supports dual-supply operation with VDD as the positive rail and VSS as the negative rail, rated from ±1.5 V to ±9 V. In this mode, logic thresholds remain centered at mid-supply, and all inputs/outputs reference the VSS rail. The device functions identically to single-supply mode, but allows interfacing with bipolar analog circuitry or negative-voltage control systems without level shifters.

Are the Q and Q̅ outputs of the CD40175BEG4 fully buffered and capable of driving TTL loads?

The Q and Q̅ outputs of the CD40175BEG4 are complementary CMOS outputs - not independently buffered - meaning Q̅ is generated internally from Q via an inverter stage. Each output can source/sink ±4.2 mA at VDD = 10 V, sufficient to drive one standard TTL input (requiring ≤ 400 µA HIGH-level current) with margin. However, fan-out beyond one TTL load may require external buffering due to capacitive loading effects on edge rate.

Can the CD40175BEG4 be used as a 4-bit shift register?

No, the CD40175BEG4 cannot function as a shift register because its four D latches lack internal serial interconnection - there is no Q-to-D feedback path or cascading capability. Each latch operates independently with separate D, CLK, and MR pins. To implement shifting, external wiring is required (e.g., connecting Q1 to D2, Q2 to D3, etc.), but this introduces timing skew and violates guaranteed setup/hold margins unless carefully managed with additional gates or delays.

Is the CD40175BEG4 RoHS compliant?

Yes, the CD40175BEG4 is RoHS compliant, as confirmed by Texas Instruments' packaging documentation: it features NiPdAu (NIPDAU) lead finish and carries "Yes" in the RoHS column for all active orderable variants including CD40175BEG4. It meets EU Directive 2011/65/EU and subsequent amendments, with no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.