Texas Instruments CD74HC377PWG4

Overview

CD74HC377PWG4 from Texas Instruments is an octal D-type flip-flop with buffered common clock and data enable, operating across 2V–6V supply. It features 14 ns typical propagation delay (CL = 15 pF, VCC = 5 V), ±25 mA output drive, and -55°C to +125°C temperature range. Used in synchronous data latching for industrial control logic and digital instrumentation interfaces.

For engineers reviewing the CD74HC377PWG4 datasheet, CD74HC377PWG4 pinout, CD74HC377PWG4 application, or CD74HC377PWG4 equivalent, key selection criteria include clock-edge-triggered simultaneous loading, LSTTL-compatible fanout (10 loads), HC-series CMOS power efficiency, and TSSOP-20 packaging for high-density PCB layouts.

Technical Context

The CD74HC377PWG4 implements eight edge-triggered D flip-flops sharing a single buffered clock (CP) and a common active-low Data Enable (E). All outputs update synchronously on the rising edge of CP when E is low - no internal gating or asynchronous reset.

Its HC logic family ensures rail-to-rail voltage transfer, 30% noise immunity (NIL/NIH at VCC = 5 V), and compatibility with both CMOS and LSTTL input thresholds. Propagation delay and transition times are balanced to minimize skew across all eight channels under load.

Key Specifications

Pinout & Package

TSSOP-20 package: 4.4 mm × 6.5 mm body, 0.65 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant. RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC377N and CD74HCT377PWR, the CD74HC377PWG4 uniquely combines wide-voltage operation (2V–6V), TSSOP-20 compactness, and full CMOS input thresholds - making it optimal for modern low-power, mixed-voltage embedded systems where layout density and supply flexibility are critical.

Availability

CD74HC377PWG4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and digital instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC377PWG4 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 over 50 years of high-reliability component development.

The CD74HC377PWG4 belongs to TI's High-Speed CMOS Logic family, designed specifically for robust, low-power synchronous data capture in harsh-environment industrial and aerospace systems.

FAQ

What is the maximum clock frequency supported by the CD74HC377PWG4?

The CD74HC377PWG4 supports up to 60 MHz maximum clock frequency when CL = 15 pF and VCC = 5 V. At VCC = 6 V, fMAX drops to 23 MHz over the full –55°C to +125°C range due to process and temperature derating - always verify timing margins using the published tW (clock pulse width) and tSU/tH specifications for your specific operating conditions. The CD74HC377PWG4 does not include internal PLLs or frequency multipliers.

Does the CD74HC377PWG4 have asynchronous reset or set functionality?

No, the CD74HC377PWG4 has no asynchronous reset (CLR) or preset (PRE) pins. It is a basic edge-triggered D flip-flop with only clock (CP), data enable (E), eight D inputs, and eight Q outputs. State initialization must be performed externally via the D inputs and controlled CP/E sequencing. This simplifies layout but requires external logic for power-on reset handling.

Can the CD74HC377PWG4 operate reliably at 3.3 V supply voltage?

Yes, the CD74HC377PWG4 is fully specified for 3.3 V operation: VIH = 2.31 V min (30% of 3.3 V), VIL = 1.0 V max, and tPLH/tPHL = 22 ns typical (CL = 15 pF). Its HC logic family guarantees rail-to-rail switching and noise immunity at 3.3 V - making it suitable for direct interface with 3.3 V microcontrollers and FPGAs without level translation.

What is the meaning of "PWG4" in the part number CD74HC377PWG4?

"PW" denotes the TSSOP-20 package (JEDEC MO-153), "G4" indicates the TI green molding compound (halogen-free, RoHS-compliant) and tape-and-reel packaging per standard reel size (2000 units/reel). The full orderable part CD74HC377PWG4 matches the active, RoHS-compliant, MSL Level-1 version documented in TI's 2026 packaging addendum.

How does the Data Enable (E) pin affect output behavior on the CD74HC377PWG4?

When E is HIGH, the CD74HC377PWG4 holds all Qn outputs unchanged regardless of CP transitions or Dn input changes - no latching occurs. When E is LOW, all eight flip-flops sample their respective Dn inputs and update Qn simultaneously on the next rising edge of CP. E is not a clock gate; it is a synchronous enable that affects only the data capture decision, not clock distribution.