NXP 74HCT4040DB,118, 74HCT series, 12-stage binary ripple counter, 79 MHz count rate, negative-edge triggered, asynchronous reset, 4.5 V to 5.5 V supply, -40°C to 125°C, 16-SSOP package.
| Parameter | Value |
|---|---|
| Series | 74HCT |
| Logic type | Binary Counter |
| Trigger type | Negative Edge |
| Mounting type | Surface Mount |
| Voltage | 4.5 V ~ 5.5 V |
| Operating temperature | -40°C ~ 125°C |
| Reset | Asynchronous |
| Package | Bulk |
| Direction | Up |
| Count rate | 79 MHz |
| Case | 16-SSOP (0.209\", 5.30mm Width) |
| Number of elements | 1 |
| Number of bits per element | 12 |
Housed in a 16-SSOP package with a 5.30 mm body width and 0.209 inch lead pitch, this part is a surface-mount device suited for dense PCB layouts.
It is ROHS3 compliant, meeting the latest EU directive requirements for lead-free assembly.
The 74HCT4040 is designed to be TTL-compatible, accepting input logic levels that match 5 V TTL (V_IH min = 2.0 V), while the 74HC4040 uses standard CMOS thresholds (V_IH min = 3.15 V at 4.5 V supply). If your driving logic is 5 V TTL, the HCT variant ensures cleaner noise margins without external level shifting.
Both are 12-stage binary ripple counters with asynchronous reset, but the HEF4040 operates from a wider supply range (3 V to 15 V) and uses CMOS thresholds. The 74HCT4040DB is limited to 4.5 V to 5.5 V and expects TTL-compatible inputs. In a 5 V system with TTL drive, the 74HCT4040DB is a drop-in functional replacement; verify the pinout matches (both are 16-pin DIP/SSOP) and check the reset polarity — both use active-high asynchronous reset.