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CD54HCT165F3A
Texas Instruments
HIGH SPEED CMOS LOGIC 8-BIT PARA
1445 Pcs New Original In Stock
Shift Shift Register 1 Element 8 Bit 16-CDIP
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Minimum 1
5.0 / 5.0
- (368 Ratings)
CD54HCT165F3A
Product Overview
11236861
DiGi Electronics Part Number
CD54HCT165F3A-DGManufacturer
Texas Instruments
CD54HCT165F3A
Description
HIGH SPEED CMOS LOGIC 8-BIT PARAInventory
1445 Pcs New Original In Stock
Shift Shift Register 1 Element 8 Bit 16-CDIP
Quantity
Minimum 1
Minimum 1
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CD54HCT165F3A Technical Specifications
Category
Logic, Shift Registers
Packaging
-
Series
54HCT
Product Status
Active
Logic Type
Shift Register
Output Type
Complementary, Push-Pull
Number of Elements
1
Number of Bits per Element
8
Function
Parallel or Serial to Serial
Voltage - Supply
4.5V ~ 5.5V
Operating Temperature
-55°C ~ 125°C (TA)
Mounting Type
Through Hole
Package / Case
16-CDIP (0.300", 7.62mm)
Supplier Device Package
16-CDIP
Datasheet & Documents
HTML Datasheet
CD54HCT165F3A-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
Not Applicable
Additional Information
Other Names
296-CD54HCT165F3A
Standard Package
1
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
The packaging was thorough, ensuring the product was well-protected from start to finish.
de desembre 02, 2025
Excellent logistics efficiency and conscientious use of eco-friendly packaging materials.
de desembre 02, 2025
Superior inventory organization facilitates bulk order processing.
de desembre 02, 2025
DiGi Electronics consistently offers great prices, helping my business save costs.
de desembre 02, 2025
The consistency in product quality from DiGi Electronics helps me maintain a high standard in my repair work.
de desembre 02, 2025
Their inventory control practices are impressive, leading to fewer stock discrepancies.
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Frequently Asked Questions (FAQ)
Can the CD54HCT165F3A be safely used in a 3.3V system when interfacing with a microcontroller that operates at 3.3V logic levels, and what are the risks of voltage mismatch on the serial input lines?
The CD54HCT165F3A is not recommended for direct use in 3.3V systems despite its CMOS compatibility. While it accepts 3.3V inputs as valid high levels (V<sub>IH</sub> ≥ 3.15V at V<sub>CC</sub> = 4.5V), its supply voltage must remain between 4.5V and 5.5V per the datasheet. Using it with a 3.3V supply risks undefined behavior and reduced noise margin. To interface with a 3.3V microcontroller, use a level shifter on the clock and data lines, or consider a true 3.3V-compatible alternative like the SN74AUP165 (3V to 3.6V operation). Direct connection without level translation may cause marginal logic thresholds, increased propagation delay, and potential reliability issues in noisy environments.
What are the key reliability concerns when replacing a legacy CD4015BE shift register with the CD54HCT165F3A in an industrial control panel operating near 120°C ambient temperature?
Replacing the CD4015BE with the CD54HCT165F3A introduces critical reliability risks due to differing voltage and timing characteristics. Although both are 8-bit shift registers, the CD54HCT165F3A requires a stable 5V supply (±10%), while the CD4015BE operates down to 3V. At 120°C ambient, ensure the PCB layout provides adequate thermal relief for the 16-CDIP package, as junction temperature must stay below 125°C. The CD54HCT165F3A’s higher input threshold (V<sub>IH</sub> = 3.15V min at 4.5V V<sub>CC</sub>) may cause logic errors if the existing system has degraded signal levels. Additionally, the CD54HCT165F3A has faster propagation delay (t<sub>pd</sub> ≈ 25 ns vs. ~150 ns for CD4015BE), which could disrupt timing in slow, RC-based clock circuits—requiring revalidation of clock integrity and signal rise times.
How does the CD54HCT165F3A compare to the SN74HCT165N in terms of design-in flexibility for high-density through-hole applications, and what trade-offs should be considered?
The CD54HCT165F3A (16-CDIP) and SN74HCT165N (16-PDIP) are functionally identical but differ in mechanical and environmental robustness. The CD54HCT165F3A’s ceramic package offers superior thermal performance and hermetic sealing, making it better suited for harsh environments like military or industrial systems exposed to moisture or thermal cycling. However, the ceramic 16-CDIP is larger (0.300" wide) and more brittle than the plastic SN74HCT165N, increasing PCB real estate and risk of cracking during assembly. For high-density through-hole designs, the SN74HCT165N is often preferred unless extended temperature range (-55°C to 125°C) or enhanced reliability justifies the CD54HCT165F3A’s cost and size. Always verify board stack-up and insertion force compatibility when substituting.
What design precautions are necessary when daisy-chaining multiple CD54HCT165F3A devices in a long serial chain for sensor data acquisition in a noisy factory environment?
When daisy-chaining CD54HCT165F3A devices in electrically noisy environments, three key risks must be mitigated: signal degradation, clock skew, and ground bounce. Use a low-impedance, shielded clock line with series termination (e.g., 33Ω resistor near the source) to minimize reflections. Ensure all V<sub>CC</sub> and GND pins are decoupled with 0.1μF ceramic capacitors placed within 5mm of the package. Avoid long parallel routing of clock and data lines to reduce crosstalk. For chains longer than 5 devices, consider buffering the clock or using differential signaling. Also, verify that cumulative propagation delay (≈25 ns per stage) does not exceed the microcontroller’s sampling window. In high-noise settings, adding Schmitt-trigger buffers (e.g., SN74HCT14) at the final output improves signal integrity and reduces susceptibility to glitches.
Is the CD54HCT165F3A a suitable drop-in replacement for the obsolete MC14015B in a 12V automotive diagnostic tool that uses 5V logic internally, and what hidden compatibility issues might arise?
The CD54HCT165F3A is not a direct drop-in replacement for the MC14015B due to fundamental logic family differences. While both are 8-bit parallel-in/serial-out shift registers, the MC14015B is a 12V-rated CMOS device with wider noise margins at higher voltages, whereas the CD54HCT165F3A is strictly a 5V HCT-family part (4.5–5.5V). Using it in a system originally designed for 12V-tolerant inputs risks damage if any signal exceeds 5.5V. Additionally, the CD54HCT165F3A has stricter input leakage and timing requirements. To safely replace the MC14015B, redesign the I/O interface to ensure all inputs are clamped or level-shifted to 5V, and verify that the existing pull-up resistors and clock drivers are compatible with HCT input thresholds. Consider the MC74HCT165A as a more modern, plastic-packaged alternative if ceramic packaging isn’t required.
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CD54HCT165F3A CAD Models
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