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Texas Instruments SN74HC174NE4
- Part No.:
- SN74HC174NE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74HC174NE4.pdf
- Description:
- IC FF D-TYPE SNGL 6BIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,555
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Product details
Overview
SN74HC174NE4 from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with shared clock and asynchronous clear, operating from 2 V to 6 V, delivering 14 ns typical propagation delay, ±4 mA output drive at 5 V, and low 80 μA max ICC power consumption - used in synchronous data latching within industrial control logic and digital instrumentation registers.
For engineers reviewing the SN74HC174NE4 datasheet, SN74HC174NE4 pinout, SN74HC174NE4 application, or SN74HC174NE4 equivalent, this page provides verified functional specifications, PDIP-16 package details, timing behavior under 2–6 V supply, and validated alternatives for register-level storage and clocked state-holding circuits.
Technical Context
The SN74HC174NE4 implements six independent D-type latches sharing one common CLK and one active-low CLR input; each flip-flop captures D-input data on the rising edge of CLK while CLR asynchronously resets all Q outputs to logic low regardless of clock state.
It operates in standard CMOS logic family voltage thresholds (VIH = 3.15 V min at VCC = 4.5 V; VIL = 1.35 V max), supports up to 10 LSTTL loads per output, and maintains reliable switching across −40°C to +85°C ambient temperature with 50 pF load capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables direct interface with 3.3 V and 5 V logic systems without level translation. |
| Propagation Delay (tpd) | 14 ns typical at VCC = 6 V - ensures fast cycle times in high-speed synchronous register chains. |
| Output Drive Strength | ±4 mA at VCC = 5 V - sufficient to directly drive multiple LSTTL inputs or small capacitive loads. |
| Quiescent Current (ICC) | 80 μA max - supports low-power operation in battery-backed or energy-constrained digital subsystems. |
| Input Leakage Current | 1 μA max - minimizes unintended current paths in high-impedance or floating-input configurations. |
| Setup Time (tsu) | 25 ns min at VCC = 6 V - defines minimum D-input stability window before CLK rising edge for reliable capture. |
| Hold Time (th) | 0 ns - allows immediate D-input change after CLK edge without violating timing constraints. |
Pinout & Package
SN74HC174NE4 uses a 16-pin plastic dual in-line package (PDIP) with 19.31 mm × 6.35 mm body size, 2.54 mm lead pitch, and through-hole mounting compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLR) | Asynchronous Clear Input | Active-low reset that forces all six Q outputs low independently of clock; must be pulled high for normal operation. |
| 2–7 (D1–D6) | Data Inputs | Independent D inputs for each of six flip-flops; sampled on CLK rising edge when CLR is high. |
| 8 (GND) | Ground Reference | Common return path for all internal circuitry and output loads; requires low-impedance connection. |
| 9–14 (Q1–Q6) | Complementary Outputs | Non-inverting registered outputs corresponding to D1–D6; retain state until next valid CLK edge. |
| 15 (CLK) | Clock Input | Positive-edge-triggered global clock; synchronizes sampling of all six D inputs simultaneously. |
| 16 (VCC) | Power Supply | Primary supply rail (2–6 V); requires local 0.1 μF bypass capacitor near pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Hex D-type architecture | Six independent edge-triggered storage elements in one IC - reduces board space vs discrete latches. |
| Shared clock and clear | Single CLK and CLR control all six flip-flops - simplifies timing control and reset coordination in register files. |
| CMOS input compatibility | High-impedance inputs with ≤1 μA leakage - prevents loading of upstream drivers and enables long trace routing. |
| Wide voltage operation | 2–6 V supply range - interoperable with legacy 5 V TTL, modern 3.3 V microcontrollers, and mixed-voltage systems. |
| Low dynamic power | 27 pF typical power dissipation capacitance per flip-flop - limits switching current and thermal rise in dense logic arrays. |
Applications
| Industrial PLC Register Banks | Digital Test Equipment Pattern Storage |
|---|---|
Use Scenario: Storing I/O status bits in programmable logic controller backplanes where deterministic timing and noise immunity are critical. IC Role / Device Role / Timing Role: Synchronous latch for parallel data acquisition from sensor buses, synchronized to system master clock. Use Value: 14 ns tpd and 0 ns hold time enable tight setup windows in 20+ MHz scan cycles without external timing margining. | Use Scenario: Holding stimulus patterns during automated test sequence execution in benchtop ATE systems. IC Role / Device Role / Timing Role: Static pattern register feeding FPGA-based waveform generators or comparator banks. Use Value: 6-bit parallel storage with shared CLR allows atomic pattern reload and fault-safe initialization on demand. |
| Embedded Microcontroller I/O Expansion | Legacy Bus Interface Latching |
Use Scenario: Extending GPIO count of resource-constrained MCUs via parallel port expansion using minimal control lines. IC Role / Device Role / Timing Role: Output latch buffering MCU parallel writes to peripheral address/data buses. Use Value: ±4 mA drive strength directly interfaces with 74LS-series peripherals without buffer amplification. | Use Scenario: Capturing address or control signals from ISA or PC/104 bus cycles where strobe-aligned sampling is required. IC Role / Device Role / Timing Role: Edge-triggered capture of bus signals synchronized to I/O write strobes. Use Value: Guaranteed 25 ns setup time at 6 V supports reliable sampling even with marginal bus skew or trace mismatch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC174N | Identical electrical specs and pinout; same PDIP-16 package but standard marking (no E4 suffix). | No functional difference; SN74HC174NE4 is TI's RoHS-compliant production variant with NIPDAU finish. | Select SN74HC174NE4 for new designs requiring RoHS compliance and traceable sourcing. |
| MC74HC174ANG | Pin-compatible PDIP-16 version from ON Semiconductor; identical 2–6 V range and 14 ns tpd, but higher 100 μA max ICC. | Same register function and timing; slightly higher quiescent current may affect battery life in ultra-low-power systems. | Choose MC74HC174ANG only if dual-sourcing or legacy BOM alignment is required. |
Compared with SN74HC174N, SN74HC174NE4 offers identical performance with certified RoHS compliance and NIPDAU lead finish, while MC74HC174ANG provides second-source availability at the cost of 25% higher standby current - making SN74HC174NE4 optimal for new industrial and instrumentation designs prioritizing regulatory conformance and power efficiency.
Availability
SN74HC174NE4 is available at Aetrix Electronics and suitable for industrial PLC register banks, digital test equipment pattern storage, and embedded microcontroller I/O expansion requiring stable component supply across extended product lifecycles.
Supply support for SN74HC174NE4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a U.S.-based semiconductor company specializing in analog and logic ICs, with leadership in industrial, automotive, and embedded signal-chain solutions.
The SN74HC174NE4 belongs to TI's 74HC logic family, designed specifically for robust, low-power, wide-voltage digital interfacing in industrial control, instrumentation, and legacy-system integration applications.
FAQ
What is the maximum clock frequency supported by the SN74HC174NE4?
The SN74HC174NE4 supports up to 29 MHz maximum clock frequency at VCC = 6 V and TA = 25°C, as specified in its switching characteristics table. At 5 V operation, the rated fmax is 25 MHz. These values assume CL = 50 pF load and proper bypassing; actual system-level frequency may be limited by PCB layout, fanout, and temperature derating.
Does the SN74HC174NE4 require external pull-up resistors on its CLR input?
Yes - the SN74HC174NE4 CLR input is active-low and internally un-biased, so it must be held high (≥VCC − 0.5 V) via an external pull-up resistor (typically 10 kΩ) when not actively asserted, otherwise undefined or metastable Q outputs may occur due to floating input conditions.
Can the SN74HC174NE4 operate reliably at 3.3 V supply voltage?
Yes - the SN74HC174NE4 is fully specified from 2 V to 6 V, including 3.3 V operation. At VCC = 3.3 V, VIH is guaranteed ≥2.31 V and VIL ≤1.09 V, with tpd extending to ~22 ns and output drive reducing to ±2.6 mA, all within published electrical characteristics.
Is the SN74HC174NE4 pin-compatible with older 74LS174 devices?
No - although both are hex D-type flip-flops with shared clock and clear, the SN74HC174NE4 uses CMOS input thresholds and lower drive strength, and its pinout differs: 74LS174 places CLR on pin 1 and CLK on pin 9, whereas SN74HC174NE4 places CLR on pin 1 and CLK on pin 15. Direct replacement requires PCB redesign.
What is the purpose of the "E4" suffix in SN74HC174NE4?
"E4" denotes Texas Instruments' RoHS-compliant, lead-free, NIPDAU-finished PDIP package variant of the SN74HC174N. It indicates compliance with EU Directive 2011/65/EU, absence of intentionally added lead, and suitability for modern automated assembly processes without lead-free reflow profile adjustments.
SN74HC174NE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 6
- Clock Frequency:
- 50 MHz
- Max Propagation Delay @ V, Max CL:
- 27ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN74HC174NE4 FAQ
1.How can I place an order for SN74HC174NE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC174NE4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74HC174NE4 reliable?
The price and inventory of SN74HC174NE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC174NE4 is usually 5 days.
3.What payment methods are accepted for SN74HC174NE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC174NE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC174NE4?
SN74HC174NE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC174NE4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74HC174NE4?
For technical support, including SN74HC174NE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC174NE4 requirements.
6.How does Aetrix verify that SN74HC174NE4 is sourced from the original manufacturer or authorized distributors?
All SN74HC174NE4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74HC174NE4 meets industry standards.
7.What is the process for return or replacement of SN74HC174NE4?
All SN74HC174NE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC174NE4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74HC174NE4 part is unused and in its original packaging.
Return procedure for SN74HC174NE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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