74HC4049D

74HC4049D is a hex buffer/driver in the HC family. Key points:
- It provides six independent, non-inverting buffer gates (no enable/tri-state).
- Used to buffer digital signals, increase drive/fan-out, and isolate stages.
- Powered from Vcc (typical HC range: 2–6 V). Inputs accept 0–Vcc CMOS levels; outputs swing near GND and Vcc within drive limits.
- D suffix is a package designation (e.g., SOIC/DIP), not a logical feature.
- Important notes: outputs are always driven (not tri-statable), so use external gates if you need bus sharing; check drive current, propagation delay (typical of HC variants: a few to a few tens of nanoseconds depending on Vcc and load); add proper decoupling.
Common uses: buffering microcontroller signals, level/fan-out expansion within a single supply, signal shaping and isolation in digital circuits. For exact voltage, current, and timing specs, consult the datasheet for the 74HC4049D variant you have.

Equivalent parts (same hex buffer/driver, 6 buffers, non‑inverting) include:
- SN74HC4049D (TI) — direct TI variant
- STMicroelectronics 74HC4049
- CD4049UBE / CD4049UB (4000‑series CMOS hex buffer)
- HEF4049UB (high‑speed CMOS, Philips/NXP)
- 74HCT4049 (TTL‑input version, if TTL levels are required)
These are common cross‑vendors equivalents; check supply voltage and input thresholds for exact drop‑in compatibility.

Here are the typical features of the 74HC4049D:
- Hex buffer/driver: six non-inverting buffer stages
- High-speed CMOS logic
- Wide supply range: 2 V to 6 V (HC family)
- Low static power consumption
- High input impedance and good fan-out
- Push-pull outputs capable of sourcing/sinking moderate load currents
- Low propagation delay for fast buffering and level shifting
- Standard 14-pin package options (D suffix refers to SOIC/DIP variants)
- Industrial temperature range commonly available (e.g., -40°C to 125°C)
- CMOS inputs and outputs compatible with typical CMOS/TTL circuitry (within Vcc limits)
Note: exact drive current and propagation delay depend on variant and operating conditions.

- Pin count: 14 pins (DIP-14 / SOIC-14).
- Function: 74HC4049D is a hex buffer/driver with six non‑inverting buffer gates. It buffers inputs to outputs to drive heavier loads and isolate stages.

- Manufacturer: Texas Instruments (TI).
- Company type: American multinational corporation that designs and manufactures semiconductors and related products (analog and digital ICs); one of the world's largest semiconductor makers.

74HC4049D is a hex non-inverting buffer/driver. Applications include:
- Digital buffering and fan-out: drive multiple inputs or long interconnects.
- Level shifting within its supply range to interface different voltage domains.
- Isolation: decouple sources from noisy/heavily loaded stages.
- Clock distribution and timing circuits (low-skew buffering).
- Sensor/ADC interfaces: stabilize weak signals and provide adequate drive for ADC inputs.
- General digital interconnects in prototypes and PCBs for buffering and signal conditioning.

74HC4049D is a 14-pin device in a surface-mount SOIC (D) package. A through-hole version exists as 74HC4049N.