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HomeProductsIntegrated Circuits (ICs)Specialized ICs74HCT595N
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74HCT595N - Freescale / NXP Semiconductors

Manufacturer Part Number
74HCT595N
Manufacturer
NXP Semiconductors
Allelco Part Number
32D-74HCT595N
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
12,340 pcs available, New & Original
Parts Description
DAC91001
Data sheet
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Category
Integrated Circuits (ICs) > Specialized ICs
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Specifications

74HCT595N Tech Specifications
Freescale / NXP Semiconductors - 74HCT595N technical specifications, attributes, parameters and parts with similar specifications to Freescale / NXP Semiconductors - 74HCT595N

Product Attribute Attribute Value
Part Number 74HCT595N
Package DAC91001
Description DAC91001
Stock Condition Get 12340 pcs available quantity at Allelco
Payment PayPal / TT / Credit Card / Western Union
Allelco Certifications ESD / ISO 9001 / ISO 13485 / ISO 28000
Product Attribute Attribute Value
Manufacturer NXP Semiconductors
RoHs Status -
Warranty 100% Perfect Functions
Transport port Hong Kong
Shipping by DHL / FedEx / UPS / TNT / SF Express
RFQ Email info@allelco.com

Frequently Asked Questions(FAQ)

How does the 74HCT595N compare to the 74HC595 in terms of input voltage compatibility and noise margin when interfacing with 3.3V logic systems?
The 74HCT595N is specifically optimized for TTL-level input thresholds, making it more compatible with 3.3V systems than standard CMOS variants like the 74HC595, which have higher input high thresholds (~2.0V). This results in better noise immunity at lower supply voltages. For a 5V system driving 3.3V logic, the 74HCT595N maintains reliable signal interpretation due to its TTL-compatible inputs, whereas the 74HC595 may exhibit reduced noise margins. In mixed-voltage applications, this distinction ensures robust data integrity without level-shifting circuitry.
What is the maximum clock frequency for reliable data shifting on the 74HCT595N when used in a daisy-chain configuration with three identical chips, assuming typical PCB trace delays?
With a specified maximum clock frequency of 36 MHz under standard conditions, the 74HCT595N can support reliable operation well above 25 MHz in most practical daisy-chains. However, when cascading three devices, total propagation delay accumulates—approximately 18 ns per chip plus interconnect skew. To ensure setup and hold time margins exceed 10–15%, a conservative operating frequency should remain below 20 MHz. This accounts for cumulative timing constraints in extended shift register chains.
Can the 74HCT595N drive inductive loads such as relays directly from its output pins, and what external components are recommended if so?
The 74HCT595N outputs cannot safely drive inductive loads like relays directly due to limited sink/source current (typically ±6 mA) and risk of latch-up or damage during switching transients. To use the 74HCT595N for relay control, an external transistor (e.g., NPN BJT or MOSFET) must buffer the output, and a flyback diode across the relay coil is essential. This protects both the IC and improves system reliability in industrial automation scenarios.
What happens to the storage register contents during power-up if the OE (output enable) pin is left floating on the 74HCT595N?
Leaving the OE pin floating on the 74HCT595N results in undefined behavior because unconnected CMOS inputs act as high-impedance nodes susceptible to noise. During power-up sequences, this may cause unintended output activation or oscillations. For reliable initialization, OE should be tied to VCC to disable outputs until the microcontroller configures it, preventing transient glitches during system startup.
When using the 74HCT595N to interface with a Raspberry Pi GPIO running at 3.3V, what pull-up or pull-down resistors might be needed on the serial data line (SER)?
Although the 74HCT595N has Schmitt-trigger inputs suitable for noisy environments, the Raspberry Pi’s 3.3V GPIO can source only ~1.6 mA into a low state. If the SER line is shared with other devices or traces are long, adding a weak 10 kΩ pull-up resistor ensures clean rise times and avoids metastability. This small resistor has negligible impact on power but enhances signal integrity, especially in prototyping layouts without controlled impedance routing.
How much heat is generated by the 74HCT595N when all eight outputs are sourcing 4 mA each at full brightness LEDs connected to a 5V supply?
Each output dissipates approximately 20 mW (4 mA × 5V drop), so eight active outputs consume 160 mW. Including internal logic dissipation, total power draw exceeds 200 mW. At ambient temperatures below 70°C, junction temperature remains within safe limits due to the DIP package’s thermal resistance (~100°C/W). No heatsink is required unless operating near upper temperature ratings or in sealed enclosures limiting airflow.
Is it acceptable to operate the 74HCT595N at 5V while its inputs are driven by a 2.5V microcontroller output?
Yes, the 74HCT595N accepts 2.0V as a valid logic-high input even at 5V supply, thanks to its TTL-compatible VIH(min) = 2.0V. A 2.5V signal comfortably satisfies this threshold, ensuring proper recognition as a high logic level. This backward compatibility allows safe interfacing with sub-3.3V microcontrollers without voltage translation hardware, simplifying designs targeting ultra-low-power embedded systems.
What is the consequence of exceeding the absolute maximum rating of 7V on the VCC pin of the 74HCT595N, even for brief periods?
Exceeding 7V on VCC violates the absolute maximum rating and risks permanent damage to the internal ESD protection diodes and gate oxides. Even transient spikes above 7V can cause forward-biasing of parasitic structures, leading to localized heating and eventual failure. In automotive or industrial environments where surges occur, external clamping circuits (e.g., Zener diodes or TVS arrays) are strongly advised to protect the 74HCT595N from voltage excursions beyond its rated range.
How does the 74HCT595N handle simultaneous updates from multiple SPI peripherals sharing the same serial bus?
The 74HCT595N lacks built-in arbitration, so simultaneous transmission from multiple SPI masters creates contention on SER, SRCLK, and RCLK lines. Uncontrolled collisions result in corrupted data and unpredictable output states. To prevent this, either dedicate separate RCLK lines per device or implement software coordination where only one master drives the bus at a time. Hardware solutions like tri-state buffers or multiplexers add complexity but improve robustness in multi-master systems.
In a battery-powered application using the 74HCT595N, how does disabling unused outputs affect overall power consumption compared to leaving them enabled?
Disabling unused outputs via OE reduces dynamic power by minimizing capacitive switching during clock edges. While static leakage is minimal in CMOS, disabling outputs eliminates shoot-through currents through output drivers. For every inactive output, savings approximate (C_load × V² × f)/8, where C_load is load capacitance and f is clock frequency. In low-power designs, this contributes measurably to extended battery life, particularly at moderate frequencies and capacitive loads.
What is the minimum allowable rise time for the SRCLK signal when driving the 74HCT595N at 25 MHz, considering its propagation delay characteristics?
The 74HCT595N requires a minimum pulse width of 25 ns for the SRCLK input, corresponding to a 10% duty cycle at 20 MHz. To meet setup/hold requirements, the rise and fall times should not exceed 1/6th of the clock period—roughly 10 ns at 25 MHz. Slower edges increase transition uncertainty and risk violating timing margins. Using fast-edge-rate drivers (e.g., 74LVC buffers) ensures reliable data capture across the entire chain.
Can the 74HCT595N be safely used with open-collector outputs from optocouplers in a bidirectional communication scheme?
Yes, the 74HCT595N can interface with open-collector sources such as those from optocouplers because its inputs are high-impedance CMOS. A pull-up resistor (e.g., 10 kΩ) to VCC establishes a defined high state when the optocoupler is off. This configuration supports isolated feedback loops common in industrial control systems, though care must be taken to match pull-up voltage to the 74HCT595N’s VCC to avoid overvoltage stress on input stages.
What is the expected lifetime degradation of the 74HCT595N if operated continuously at 85°C junction temperature with frequent output switching?
Under continuous operation at 85°C junction temperature and normal switching loads, the 74HCT595N experiences negligible lifetime degradation. NXP specifies >10-year operational life under these conditions based on Arrhenius models and electromigration studies. Frequent switching increases dynamic power but not leakage-induced wearout significantly. Only extreme conditions (e.g., >125°C) accelerate aging mechanisms like gate oxide breakdown or bond wire fatigue.
How does the 74HCT595N perform in environments with high electromagnetic interference (EMI), and what layout practices enhance robustness?
The 74HCT595N benefits from its Schmitt-trigger inputs, which provide hysteresis that rejects slow-moving noise near threshold levels. Combined with short trace lengths and proper grounding, it resists EMI-induced glitches effectively. Critical layout practices include placing bypass capacitors (<100 nF) close to VCC/GND pins, minimizing loop areas on clock/data lines, and avoiding parallel routing with high-speed signals. These measures reduce susceptibility to radiated coupling in factory floor or vehicular environments.
Is it feasible to cascade more than five 74HCT595N devices in a single shift register chain without degrading signal quality?
While technically possible, cascading more than five 74HCT595N devices introduces cumulative propagation delay and increased skew, reducing timing margins below safe levels. Total delay may exceed 100 ns across six chips, making it difficult to sustain reliable operation above 10 MHz. For longer chains, consider segmented architectures with intermediate latches or dedicated serial-to-parallel converters with lower latency, preserving design margins in high-speed applications.
What is the effect of connecting multiple outputs of the 74HCT595N to a common node without series resistors?
Connecting multiple 74HCT595N outputs directly to a shared node creates contention during state transitions, especially when some outputs are high and others low. This leads to excessive current flow through the internal transistors, potentially damaging the IC. Even brief mismatches can cause localized heating or latch-up. Series resistors (e.g., 22 Ω) between each output and the shared line isolate driver stages and limit peak currents, protecting the 74HCT595N and improving signal fidelity in LED matrix or bus-sharing configurations.
How should the 74HCT595N be handled during reflow soldering in a surface-mount assembly process if originally delivered in DIP packaging?
The 74HCT595N in DIP packaging is not designed for standard reflow profiles; attempting direct reflow risks delamination, cracked leads, or internal bond failures. If SMT conversion is necessary, custom stencils and hand-soldering with lead-free solder paste at <240°C peak are recommended. Alternatively, use a DIP-to-SMT adapter board for automated placement. Direct exposure to >260°C for >10 seconds degrades performance and voids warranty, compromising long-term reliability.
What diagnostic technique best verifies correct functionality of the 74HCT595N in a prototyped circuit before finalizing firmware?
Inject a known binary pattern into the serial input (SER) while monitoring output pins sequentially using an oscilloscope or multimeter. Verify that each bit shifts correctly and appears at the appropriate QH' terminal after eight SRCLK pulses, then confirm parallel loading via RCLK. Toggle OE to validate output enable/disable behavior. This method catches wiring errors, timing violations, and firmware bugs early, ensuring the 74HCT595N operates as intended before committing to production.

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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Freescale / NXP Semiconductors

74HCT595N

Freescale / NXP Semiconductors
32D-74HCT595N

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