Texas Instruments SN74HC273PWRG4

Overview

SN74HC273PWRG4 from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with active-low asynchronous clear, operating across 2 V to 6 V. It delivers ±4 mA output drive at 5 V, 12 ns typical propagation delay, and 80 µA maximum supply current-enabling reliable data latching in digital control logic, bus interface buffers, and synchronous state machines.

For engineers reviewing the SN74HC273PWRG4 datasheet, SN74HC273PWRG4 pinout, SN74HC273PWRG4 application, or SN74HC273PWRG4 equivalent, this page provides verified functional identity, TSSOP-20 package mapping, timing behavior under industrial temperature (–40°C to +85°C), and validated alternative options for register-level logic replacement.

Technical Context

The SN74HC273PWRG4 implements eight independent D flip-flops sharing a common clock (CLK) and global active-low clear (CLR) input. Each flip-flop samples its dedicated D input on the rising edge of CLK and holds the value until the next clock or a CLR assertion.

It uses standard CMOS silicon technology with balanced output drive, low input leakage (≤1 µA), and rail-to-rail output swing. Timing is voltage-dependent: max clock frequency reaches 25 MHz at 6 V and 4 MHz at 2 V, with setup time as low as 21 ns at 6 V.

Key Specifications

Pinout & Package

TSSOP-20 package (6.50 mm × 4.40 mm body, 0.65 mm pitch), lead-free with NiPdAu finish, moisture sensitivity level 1 (MSL-1), RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC273PWRG4, SN74HCT273PWR offers improved noise immunity with TTL input thresholds but identical speed and drive, while MC74HC273ADTR2G provides equivalent functionality in a larger SOIC package with better thermal performance but incompatible footprint.

Availability

SN74HC273PWRG4 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, test equipment design, and digital audio subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74HC273PWRG4 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 ICs, with decades of heritage in industry-standard logic families including 74HC.

The SN74HC273 product line delivers octal D-type storage for synchronous digital systems-designed for reliability in industrial automation, automotive control, and instrumentation where deterministic timing and wide voltage operation are critical.

FAQ

What is the maximum clock frequency supported by SN74HC273PWRG4?

The SN74HC273PWRG4 supports up to 25 MHz at VCC = 6 V and TA = –40°C to +85°C, dropping to 4 MHz at VCC = 2 V under the same temperature conditions. These values are specified in the "Timing Requirements – SN74HC273" section of the datasheet and reflect guaranteed operation across the full industrial temperature range-not just typical lab conditions. The SN74HC273PWRG4 achieves this via optimized CMOS gate design and tight process control.

Does SN74HC273PWRG4 have Schmitt-trigger inputs?

No, SN74HC273PWRG4 does not include Schmitt-trigger inputs. Its CLK and CLR inputs follow standard CMOS threshold behavior (VIH ≈ 0.7×VCC, VIL ≈ 0.3×VCC), meaning it requires clean, monotonic signal edges. For noisy environments, external RC filtering or a dedicated Schmitt-trigger buffer (e.g., SN74HC14) should precede SN74HC273PWRG4 inputs to prevent multiple clocking or spurious clear assertions.

Can SN74HC273PWRG4 drive LEDs directly?

SN74HC273PWRG4 can sink or source up to ±4 mA per output at 5 V, which is sufficient for low-current indicator LEDs (e.g., 2 mA @ 1.8 V forward voltage with appropriate series resistor). However, it is not rated for continuous DC LED drive above 4 mA per pin or >25 mA total I_O. For higher-brightness or multi-LED applications, a dedicated LED driver or transistor buffer is recommended to avoid exceeding absolute maximum ratings.

What is the purpose of the unused D inputs on SN74HC273PWRG4?

All eight D inputs on SN74HC273PWRG4 are individually accessible and must be actively driven to a valid logic level (VCC or GND) if unused-floating D inputs cause unpredictable output states due to CMOS input sensitivity. TI's datasheet explicitly warns against leaving inputs unconnected and recommends tying unused D pins to GND for default-low behavior or VCC for default-high, depending on system reset strategy.

Is SN74HC273PWRG4 pin-compatible with SN74LS273?

No, SN74HC273PWRG4 is not pin-compatible with SN74LS273. While both are octal D flip-flops with shared CLK and CLR, SN74LS273 uses a 20-pin PDIP package with different pin assignments (e.g., VCC at pin 16, GND at pin 8), whereas SN74HC273PWRG4 uses TSSOP-20 with VCC at pin 20 and GND at pin 10. Electrical incompatibility also exists: LS logic draws significantly more supply current and has different voltage thresholds, making direct substitution unsafe without redesign.