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HomeProductsIntegrated Circuits (ICs)Specialized ICs74HCT595PW
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74HCT595PW - Freescale / NXP Semiconductors

Manufacturer Part Number
74HCT595PW
Manufacturer
NXP Semiconductors
Allelco Part Number
32D-74HCT595PW
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
16,600 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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In stock: 16600

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Specifications

74HCT595PW Tech Specifications
Freescale / NXP Semiconductors - 74HCT595PW technical specifications, attributes, parameters and parts with similar specifications to Freescale / NXP Semiconductors - 74HCT595PW

Product Attribute Attribute Value
Part Number 74HCT595PW
Package DAC91001
Description DAC91001
Stock Condition Get 16600 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 74HCT595PW compare to the 74HC595 in terms of input voltage compatibility and noise margin when interfacing with a 3.3V microcontroller?
The 74HCT595PW is designed for 5V operation with TTL-compatible inputs, making it directly compatible with 3.3V logic levels from microcontrollers like STM32 or ESP32 without level shifting. Its input threshold is typically 0.8V at Vcc = 4.5V, which allows it to reliably accept 3.3V high signals, unlike standard 74HC595 devices that may exhibit reduced noise margins at 3.3V. This makes the HCT variant more suitable for mixed-voltage systems where signal integrity must be maintained across logic families.
What are the key differences between the 74HCT595PW and the 74LVC595 in low-power applications, particularly regarding quiescent current and switching performance at 3.3V?
While both support 3.3V operation, the 74LVC595 typically draws less than 1 µA of quiescent current compared to the 74HCT595PW’s higher leakage due to CMOS input structure. However, the HCT version offers better noise immunity at 5V with 3.3V inputs, whereas LVC provides superior power efficiency. For battery-powered designs requiring minimal static power, LVC is preferable; for legacy 5V systems with 3.3V logic, HCT maintains signal integrity more robustly.
Can the 74HCT595PW drive inductive loads such as relays or solenoids directly, and what precautions should be taken to protect the output pins?
No, the 74HCT595PW cannot safely drive inductive loads directly due to limited sink/source current (typically ±6 mA per pin) and lack of built-in flyback protection. A relay coil must be isolated using an external transistor or MOSFET, with a freewheeling diode across the load. Additionally, snubber circuits or TVS diodes may be required if inductive kick exceeds 0.5 A·μs, which could damage the IC over time.
In a daisy-chained configuration using multiple 74HCT595PW shift registers, how does propagation delay accumulate, and what limits maximum clock frequency?
Each 74HCT595PW has a typical clock-to-output delay of 18 ns at 4.5V. In a chain of N devices, total latency scales linearly as T_total = N × t_pd + t_setup. With a 10 MHz SPI clock, only about 5–6 cascaded stages can be supported before timing violations occur. For longer chains, reducing clock frequency below 1/(N×t_pd) is necessary. Alternatively, using parallel load with latched outputs reduces effective chain length by enabling block updates.
What is the recommended decoupling strategy for the 74HCT595PW in high-speed digital systems, and why is it critical near power rails?
A 0.1 µF ceramic capacitor should be placed within 2 mm of the VCC and GND pins of the 74HCT595PW to suppress high-frequency transients. Due to its fast rise/fall times (~3 ns), rapid current surges during switching generate significant di/dt, which can couple noise into the supply rail. Without proper decoupling, this may cause false triggering in adjacent logic gates or instability in shared power nets, especially in multi-chip PCBs.
How does temperature affect the output drive capability of the 74HCT595PW, and what derating factors apply for industrial (-40°C to +85°C) environments?
At elevated temperatures, the maximum sink current decreases by approximately 0.5% per °C above 25°C. For continuous operation at 85°C, the safe output current drops to ~4.2 mA per pin instead of 6 mA at 25°C. When driving LEDs or small motors, resistor values should be adjusted upward by 10–15% to maintain brightness or torque while ensuring thermal reliability. Always verify junction temperature stays below 125°C under worst-case conditions.
Can the 74HCT595PW be used in hot-swap scenarios where power sequencing is uncontrolled, and what ESD risks exist during handling?
Yes, but only if the device is powered down before insertion. Hot-swapping without isolation risks latch-up due to parasitic thyristor structures in CMOS devices. Although the 74HCT595PW has 2 kV HBM ESD protection, repeated exposure during assembly increases failure risk. Handling should follow ANSI/ESD S20.20 standards—wrist straps, grounded workstations, and conductive packaging reduce cumulative damage probability significantly.
What layout considerations are essential when routing signals connected to the 74HCT595PW to minimize crosstalk and electromagnetic interference?
Keep data, clock, and latch lines shorter than λ/10 at 50 MHz (~6 cm) and route them away from high-impedance nodes. Use ground planes beneath signal traces and avoid parallel runs with other clocks. Terminate unused inputs with pull-downs to prevent floating states that increase susceptibility. For long traces (>10 cm), series termination resistors (22–100 Ω) near the source reduce reflections. These practices ensure signal integrity up to 30 MHz operation.
How does the 74HCT595PW handle bus contention if multiple outputs attempt to drive different logic levels simultaneously?
The 74HCT595PW uses push-pull output drivers, which inherently prevent shoot-through current unless external components create feedback paths. However, if two outputs are forced into opposing states via external circuitry (e.g., back-driven lines), excessive currents may flow through internal transistors, potentially exceeding absolute maximum ratings. Such configurations violate intended use and risk permanent damage—always ensure outputs are either tri-stated or coordinated through hardware arbitration.
In comparison to open-collector variants like the 74ACT595, what advantages does the 74HCT595PW offer for bidirectional communication on shared data lines?
The 74HCT595PW’s totem-pole outputs provide active pull-up and pull-down capability, eliminating the need for external pull-up resistors required by open-drain designs. This enables full-speed unidirectional shifting without waiting for line settling. However, for true bidirectional protocols like I²C, neither variant is ideal—dedicated I/O expanders with built-in arbitration are safer. Still, HCT’s lower output impedance improves slew rate and reduces ringing in point-to-point links versus ACT’s slightly slower transitions.
What is the impact of Vcc droop during output switching on the 74HCT595PW, and how can it affect downstream logic?
Simultaneous switching of all eight outputs can draw peak currents up to 20 mA, causing transient voltage drops on the supply rail. If Vcc sags below 3.0V momentarily, inputs may misinterpret valid high signals as low, leading to erroneous data capture. To mitigate, use bulk capacitance (1–10 µF tantalum near the IC) and minimize loop area in power traces. Monitoring Vcc with an oscilloscope during stress testing reveals whether decoupling is adequate for the application’s dynamic load profile.
How does the 74HCT595PW behave when its output enable (OE) pin is left floating, and what reliability implications arise?
Leaving OE unconnected results in undefined logic state, which may cause unintended output activation during power-up or reset. Although the pin has internal hysteresis, it is not guaranteed across all process corners and temperatures. Best practice is to tie OE permanently low for normal operation or connect it through a 10 kΩ resistor to ground to establish a defined default. This eliminates marginal states that could lead to intermittent failures in production units.
What are the limitations of using the 74HCT595PW for PWM generation compared to dedicated timer peripherals?
The 74HCT595PW lacks analog comparators or programmable timers, so generating precise PWM requires external firmware coordination. Software-based bit-banging introduces jitter due to interrupt latency and ISR overhead, limiting accuracy to ±100 ns or worse at 1 kHz duty cycles. For applications needing sub-µs resolution, consider using a microcontroller with native PWM modules instead. The shift register is best suited for static or slowly changing LED patterns rather than real-time motor control.
In automotive-grade designs, does the 74HCT595PW meet AEC-Q100 requirements, and what environmental constraints apply?
No, the 74HCT595PW is not qualified to AEC-Q100 standards. It operates over -40°C to +85°C commercial grades but lacks stress-testing validation for vibration, thermal cycling, or humidity resistance required in automotive environments. For infotainment lighting or interior controls, opt for automotive-qualified equivalents like the PCA9538 or TC7MH595G. Using non-automotive parts in safety-critical systems violates functional safety norms and voids certifications like ISO 26262.
How does package choice (TSSOP vs. SOIC) influence thermal performance for the 74HCT595PW when dissipating 50 mW continuously?
The TSSOP-16 package of the 74HCT595PW has lower thermal resistance (θJA ≈ 120°C/W) than SOIC due to smaller footprint and closer lead placement. At 50 mW dissipation, junction temperature rises by only 6°C above ambient, well within limits. However, in confined spaces with poor airflow, even TSSOP may exceed 85°C ambient. Adding copper pours or vias to ground plane reduces θJA by 20–30%, improving reliability in compact designs.
Can the 74HCT595PW be used in redundant systems requiring fail-safe behavior upon power loss?
The device retains shifted data during power-down since it contains no volatile memory. Upon restoration, outputs resume last state unpredictably unless latched externally. For fail-safe applications (e.g., brake lights turning off on power loss), add pull-down resistors on outputs or integrate with watchdog circuits that force known states. Relying solely on the shift register risks hazardous conditions in safety-critical infrastructure, violating IEC 61508 principles for deterministic behavior.
What is the maximum allowable fan-out when driving multiple 74HCxx inputs from a single output of the 74HCT595PW?
Each output can source/sink up to 6 mA, while typical 74HC input draws 0.1 µA static current and 1 µA during transitions. Conservatively, fan-out is limited to 30 identical loads based on current budget. However, capacitive loading dominates at higher frequencies: each 74HC input adds ~5 pF, so 30 loads yield 150 pF, pushing rise times beyond datasheet specs. For reliable operation beyond 1 MHz, buffer the output or reduce fan-out to <15 loads.

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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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74HCT595PW Image

74HCT595PW

Freescale / NXP Semiconductors
32D-74HCT595PW

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