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SN74HCT595QPWRQ1
Texas Instruments
AUTOMOTIVE 8-BIT SHIFT REGISTER
2294 Pcs New Original In Stock
Shift Shift Register 1 Element 8 Bit 16-TSSOP
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5.0 / 5.0
- (497 Ratings)
SN74HCT595QPWRQ1
Product Overview
10414517
DiGi Electronics Part Number
SN74HCT595QPWRQ1-DGManufacturer
Texas Instruments
SN74HCT595QPWRQ1
Description
AUTOMOTIVE 8-BIT SHIFT REGISTERInventory
2294 Pcs New Original In Stock
Shift Shift Register 1 Element 8 Bit 16-TSSOP
Quantity
Minimum 1
Minimum 1
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SN74HCT595QPWRQ1 Technical Specifications
Category
Logic, Shift Registers
Packaging
Tape & Reel (TR)
Series
-
Product Status
Active
Logic Type
Shift Register
Output Type
Tri-State
Number of Elements
1
Number of Bits per Element
8
Function
Serial to Parallel
Voltage - Supply
4.5V ~ 5.5V
Operating Temperature
-40°C ~ 125°C (TA)
Grade
Automotive
Qualification
AEC-Q100
Mounting Type
Surface Mount
Package / Case
16-TSSOP (0.173", 4.40mm Width)
Supplier Device Package
16-TSSOP
Base Product Number
74HCT595
Datasheet & Documents
HTML Datasheet
SN74HCT595QPWRQ1-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
296-SN74HCT595QPWRQ1DKR
296-SN74HCT595QPWRQ1CT
296-SN74HCT595QPWRQ1TR
Standard Package
2,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
La rapidité de leur expédition harmonisée avec leur suivi précis m’a vraiment satisfait.
Dec 02, 2025
しっかりとした梱包のおかげで、配送途中の振動や衝撃にも耐えて無事到着。安心して注文できます。
Dec 02, 2025
The pricing advantage they offer, combined with excellent support, makes them my go-to supplier.
Dec 02, 2025
The site is easy to explore, even for first-time users.
Dec 02, 2025
Their efficient logistics team ensures rapid delivery, and the robustness of their products lasts for years.
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Frequently Asked Questions (FAQ)
Can the SN74HCT595QPWRQ1 be safely used in a 3.3V microcontroller interface without level shifting, and what are the risks if I drive its inputs directly from a 3.3V GPIO?
The SN74HCT595QPWRQ1 is not recommended for direct 3.3V microcontroller interfacing without level shifting. While HCT logic accepts TTL-compatible inputs (VIH min ≈ 2.0V), reliable operation at 3.3V depends on signal integrity and noise margins. In automotive environments with high EMI, marginal VIH levels can cause intermittent shifting errors or metastability. For robust design-in, use a 5V-tolerant buffer or level shifter (e.g., TXB0108) between the MCU and the SN74HCT595QPWRQ1, especially when trace lengths exceed 10 cm or when operating near the -40°C lower temperature limit where threshold voltages shift.
What are the key reliability concerns when replacing the SN74HCT595QPWRQ1 with a commercial-grade SN74HCT595PWR in an automotive dashboard application?
Replacing the automotive-qualified SN74HCT595QPWRQ1 (AEC-Q100 Grade 1, -40°C to +125°C) with the commercial SN74HCT595PWR (-40°C to +85°C) introduces significant reliability risks. The commercial part lacks AEC-Q100 validation, meaning it hasn’t been tested for thermal cycling, humidity bias, or electrostatic discharge under automotive stress conditions. Additionally, its reduced operating temperature ceiling (+85°C vs. +125°C) may lead to premature failure in under-hood or sun-exposed dashboard zones. Always maintain the Q1 suffix for safety-critical or high-temperature zones; mixing grades can void automotive compliance and increase field return risk.
How does the tri-state output behavior of the SN74HCT595QPWRQ1 affect bus sharing with other 5V peripherals, and what precautions are needed to avoid contention?
The SN74HCT595QPWRQ1’s tri-state outputs allow safe bus sharing, but improper timing of the OE (Output Enable) pin can cause momentary bus contention if another device drives the same lines during transition. To mitigate this, implement a 'break-before-make' sequence in firmware: disable OE before enabling another driver, and re-enable OE only after the other device releases the bus. Add a 100–470Ω series resistor on each output line to limit current during accidental overlap. Also ensure all shared devices use compatible logic families—mixing with LS-TTL or CMOS without pull-ups may result in undefined states due to differing input thresholds.
Is it safe to daisy-chain multiple SN74HCT595QPWRQ1 devices across a 50 cm flex cable in a motor control module, and what signal integrity measures are required?
Daisy-chaining SN74HCT595QPWRQ1 devices over 50 cm of flex cable is feasible but requires careful signal integrity planning. At standard shift frequencies (>1 MHz), transmission line effects and crosstalk can corrupt data. Use controlled-impedance routing, terminate the serial data line with a 100–120Ω resistor near the last device, and keep clock and data lines closely coupled to reduce loop area. Shield the cable if near motor drivers. Reduce shift frequency to ≤500 kHz if reflections persist. Also, ensure all grounds are tied with low-inductance paths—floating ground references between boards can cause latch-up or erratic behavior in automotive environments.
Can the SN74HCT595QPWRQ1 drive LED segments directly without external transistors, and what are the thermal and lifetime implications under continuous 125°C ambient operation?
The SN74HCT595QPWRQ1 can drive small LEDs directly (up to ~6–8 mA per output within total package limits), but continuous operation at 125°C ambient drastically reduces reliability. The 16-TSSOP package has limited thermal dissipation; sustained high current causes junction temperature to exceed safe limits, accelerating electromigration and shortening lifespan. For LED driving in high-temp zones, use external MOSFETs or Darlington arrays (e.g., ULN2803A) to offload current. If direct drive is unavoidable, limit duty cycle, reduce LED current to ≤4 mA, and ensure adequate copper pour under the package for heat sinking—monitor with thermal imaging during validation.
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SN74HCT595QPWRQ1 CAD Models
Texas Instruments SN74HCT595QPWRQ1 PCB symbols & footprints
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