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HomeProductsIntegrated Circuits (ICs)Logic - Shift Registers74HCT595D,118
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74HCT595D,118 - NXP USA Inc.

Manufacturer Part Number
74HCT595D,118
Manufacturer
NXP Semiconductors
Allelco Part Number
98D-74HCT595D,118
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
12,074 pcs available, New & Original
Parts Description
NOW NEXPERIA 74HCT595D - SERIAL
Package
16-SO
Data sheet
-
RoHs Status
 
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In stock: 12074

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Specifications

74HCT595D,118 Tech Specifications
NXP USA Inc. - 74HCT595D,118 technical specifications, attributes, parameters and parts with similar specifications to NXP USA Inc. - 74HCT595D,118

Product Attribute Attribute Value
Manufacturer NXP Semiconductors
Voltage - Supply 4.5V ~ 5.5V
Supplier Device Package 16-SO
Series 74HCT
Package / Case 16-SOIC (0.154", 3.90mm Width)
Package Bulk
Output Type Tri-State
Product Attribute Attribute Value
Operating Temperature -40°C ~ 125°C
Number of Elements 1
Number of Bits per Element 8
Mounting Type Surface Mount
Logic Type Shift Register
Function Serial to Parallel, Serial
Base Product Number 74HCT595

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

How does the 74HCT595D,118 handle input level compatibility when interfacing with 3.3V logic devices in a mixed-voltage system?
The 74HCT595D,118 is specifically designed to interface with both 5V and 3.3V logic levels due to its HCMOS-TTL compatible input thresholds. With VCC = 4.5V to 5.5V, the device accepts TTL-level inputs (0.8V max for logic low, 2.0V min for logic high), which ensures reliable operation when driven by 3.3V microcontrollers or sensors. At 5V supply, the input high threshold is approximately 3.5V, comfortably above the 3.3V high output of many modern logic families. This backward compatibility allows seamless integration into legacy 5V systems without level-shifting circuitry, reducing component count and PCB real estate.
What are the timing constraints for cascading multiple 74HCT595D,118 shift registers in a multi-stage LED display driver application?
When cascading multiple 74HCT595D,118 devices, the total propagation delay from serial input to parallel output must be considered. Each stage introduces a typical propagation delay of 15 ns at 5V and 25°C. For n stages, the cumulative delay is roughly n × 15 ns. Additionally, the setup time for the latch enable (RCLK) is typically 10 ns, and the hold time is 5 ns. In a 16-stage cascade, this results in a total data-to-output delay of up to 240 ns. Engineers should ensure that the microcontroller’s clock frequency accounts for this delay to maintain correct data capture during RCLK edge transitions, especially in high-speed scanning applications.
Can the 74HCT595D,118 be used reliably in automotive environments with wide temperature swings?
Yes, the 74HCT595D,118 is qualified for industrial temperature ranges from -40°C to 125°C, making it suitable for automotive and ruggedized applications. Its HCMOS design provides stable performance across this range with minimal parametric drift. However, while the device itself operates within these limits, engineers must consider thermal management and layout parasitics—especially in densely populated PCBs—to avoid localized heating effects that could impact long-term reliability. Derating voltage and current usage near maximum ratings is recommended to enhance robustness in extended temperature cycling conditions.
Is it acceptable to use the 74HCT595D,118 without pull-up resistors on the output pins when driving inductive loads like relays or solenoids?
No, it is not advisable. Although the 74HCT595D,118 has tri-state outputs capable of sourcing and sinking up to 25 mA per pin, driving inductive loads directly can lead to voltage spikes during turn-off due to back-EMF. These transients may exceed the absolute maximum ratings (typically ±0.5V below VCC or above GND), risking damage. A flyback diode across each inductive load is essential to clamp reverse voltages. Additionally, using discrete transistors as output buffers increases drive capability and isolates the IC from mechanical switching stresses, improving overall system longevity.
What precautions should be taken when soldering the 74HCT595D,118 in mass production using reflow ovens?
The 74HCT595D,118 has an MSL rating of 1, indicating it is moisture-insensitive and can withstand unlimited storage before baking. However, proper reflow profiles must still be followed: peak temperature should not exceed 260°C for more than 10 seconds, with a ramp rate below 3°C/second. Exceeding these parameters risks damaging the die or delamination. Nexperia recommends using a standard Sn/Pb or lead-free reflow profile compliant with IPC-J-STD-020. Adequate cooling between passes helps prevent thermal stress accumulation across multiple components on the same board.
How does power consumption compare between active shifting and standby modes for the 74HCT595D,118?
The 74HCT595D,118 draws significantly less power when idle compared to dynamic operation. Under typical 5V operation at 25°C, quiescent current is around 8 µA, rising to ~1.5 mA when all outputs are actively switching at full load. During serial clocking at 10 MHz, dynamic power consumption can reach 15–20 mW depending on output loading and toggle rates. Engineers aiming for low-power designs should minimize clock frequency and use OE# (output enable) to tri-state unused outputs, reducing capacitive loading and thereby lowering switching losses.
Why might a designer choose the 74HCT595D,118 over a similar 74HC595 variant in a new design?
The key advantage lies in voltage-level compatibility. While both share similar functionality, the 74HCT595D,118 uses TTL-compatible input thresholds, making it interoperable with legacy 5V systems and certain 3.3V microcontrollers without translation. The "HCT" suffix indicates optimized input hysteresis and threshold matching to standard TTL logic families, reducing noise susceptibility and glitch propagation. In contrast, pure HC parts have higher input thresholds (~70% of VCC), which can cause marginal logic recognition at lower rail voltages. Thus, HCT variants offer broader interoperability in mixed-voltage environments common in embedded systems.
What is the impact of enabling the output enable (OE#) pin during data transfer on signal integrity in high-impedance bus configurations?
Asserting the OE# (active-low output enable) places the outputs in a high-impedance state, effectively disconnecting them from the data path. This prevents contention when multiple shift registers share a common data line, but it also eliminates any passive termination benefit from the output drivers. In long traces or unterminated buses, disabling OE# unnecessarily can degrade signal rise/fall times due to increased reflection risks. Therefore, OE# should only be deasserted (outputs enabled) after the final clock pulse in the transfer cycle to maintain clean transitions and avoid ringing caused by mismatched impedance.
Are there any limitations regarding the minimum clock pulse width when using the serial clock (SHCP) input with the 74HCT595D,118?
Yes, the 74HCT595D,118 requires a minimum high-time and low-time of 20 ns for the SHCP (serial clock) signal at 5V operation. This ensures reliable edge detection by internal flip-flops. Below this threshold, especially in noisy environments, metastability or incomplete state capture may occur. For systems running near the limit—such as those using fast microcontrollers with tight timing loops—engineers should verify worst-case delays including propagation skew across multiple stages. Using slower clocks (e.g., <2 MHz) provides margin, but asynchronous designs must explicitly meet these timing budgets to guarantee deterministic behavior.
How does the internal architecture of the 74HCT595D,118 affect its ability to sink current versus source current on individual output pins?
The 74HCT595D,118 features symmetrical output drivers capable of sourcing and sinking up to 25 mA per pin, with a total package current limit typically around 70–80 mA. However, practical limits arise from package dissipation and thermal resistance. Continuous sinking current generates more heat than sourcing under identical loads because of differing transistor configurations in the output stage. In LED driving applications where LEDs are connected to VCC via series resistors, most current flows out (source mode), which is efficient. Conversely, if sinking high-side loads (e.g., open-collector outputs), ensure ambient temperatures stay below 85°C to avoid exceeding junction limits. Always derate based on duty cycle and PCB copper area.
What role does the latch clock (RCLK) play in preventing glitches when updating parallel outputs in multiplexed displays?
The RCLK (latch clock) synchronizes the transition of data from the shift register to the output latches. Without proper control, changing one bit while others are transitioning can cause intermediate states that manifest as visible flicker or incorrect patterns in multiplexed displays. By holding RCLK low until all serial bits are loaded, then pulsing it high once, the entire byte updates simultaneously. This atomic update minimizes transient conduction through partially enabled LEDs or segments, improving visual stability. The 74HCT595D,118 supports this with a dedicated latch stage decoupled from the shift chain, ensuring clean, synchronous output changes.

Parts with Similar Specifications

The three parts on the right have similar specifications to NXP USA Inc. 74HCT595D,118

Product Attribute 74HCT595D-Q100,118 74HCT595DB,118 74HCT595D,112 74HCT595DB,112
Part Number 74HCT595D-Q100,118 74HCT595DB,118 74HCT595D,112 74HCT595DB,112
Manufacturer Nexperia USA Inc. Nexperia USA Inc. NXP Semiconductors Nexperia USA Inc.
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Number of Elements - - - -
Voltage - Supply - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Output Type - Current - Unbuffered Voltage - Buffered -
Number of Bits per Element - - - -
Series - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Mounting Type - Surface Mount Through Hole Surface Mount
Logic Type - - - -
Function - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C

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74HCT595D,118 Image

74HCT595D,118

NXP USA Inc.
98D-74HCT595D,118

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