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Texas Instruments SN74HC174DRG4
- Part No.:
- SN74HC174DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HC174DRG4.pdf
- Description:
- IC FF D-TYPE SNGL 6BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:17,430
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Product details
Overview
SN74HC174DRG4 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 at 5 V, ±4-mA output drive, and ≤80 μA max ICC - used in synchronous data latching and register staging within digital control logic.
For engineers reviewing the SN74HC174DRG4 datasheet, SN74HC174DRG4 pinout, SN74HC174DRG4 application, or SN74HC174DRG4 equivalent, this page provides verified functional modes, timing constraints (tsu = 25 ns, tw(CLR) = 20 ns @ 4.5 V), package-specific thermal resistance (RθJA = 73 °C/W), and validated alternatives for logic register replacement in industrial and embedded systems.
Technical Context
The SN74HC174DRG4 implements six independent D-type flip-flops sharing one common clock (CLK) and one active-low asynchronous clear (CLR) input, with no internal feedback or preset functionality. Each flip-flop transfers data from D to Q on the rising edge of CLK when CLR is high.
It operates in standard CMOS logic family voltage thresholds: VIH = 3.15 V and VIL = 1.35 V at VCC = 4.5 V, supports 50-pF load switching, and exhibits zero hold time requirement (th = 0 ns) - enabling robust interface with microcontroller GPIOs and other HC-series logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - compatible with 3.3 V and 5 V logic domains without level translation. |
| tpd (Typ) | 14 ns @ VCC = 6 V, CL = 50 pF - enables reliable operation up to 25 MHz clock frequency in buffered register paths. |
| Output Drive | ±4 mA @ 5 V - sufficient to directly drive 10 LSTTL loads or interface with HC/HCT inputs without buffering. |
| ICC (Max) | 80 μA @ VCC = 6 V - ultra-low static power ideal for battery-backed or energy-constrained control modules. |
| Input Leakage | ±1 μA max - ensures stable logic levels even with high-impedance pull-ups or long PCB traces. |
| Setup Time | 25 ns @ VCC = 4.5 V - defines minimum D-input stability window before CLK rising edge for deterministic sampling. |
| Pulse Width (CLR) | 20 ns min @ VCC = 4.5 V - guarantees reliable asynchronous reset with fast-debounced control signals. |
Pinout & Package
SN74HC174DRG4 is housed in a 16-pin SOIC (D) package measuring 9.90 mm × 3.90 mm, with standard 1.27-mm lead pitch and RoHS-compliant NiPdAu (NIPDAU) lead finish. MSL Level-1 rating supports uncompromised reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLR) | Asynchronous Clear Input | Active-low global reset; forces all six Q outputs low regardless of CLK state. |
| 2–7 (D1–D6) | Data Inputs | Independent parallel data inputs; each controls corresponding Q output on next CLK↑. |
| 8 (GND) | Ground Reference | Return path for all internal logic and I/O; must be low-impedance for noise immunity. |
| 9–14 (Q1–Q6) | Registered Outputs | Complementary to D inputs after one CLK↑ cycle; no inherent inversion or latching delay beyond tpd. |
| 15 (CLK) | Clock Input | Positive-edge-triggered master clock; synchronizes all six flip-flops simultaneously. |
| 16 (VCC) | Supply Voltage | Primary power rail; requires local 0.1-μF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2–6 V operation enables direct use across mixed-voltage systems (e.g., 3.3 V MCU + 5 V peripheral bus). |
| Edge-Triggered Synchronization | Rising-edge CLK sensitivity eliminates metastability risk from slow or noisy clock edges in deterministic control loops. |
| Shared Control Inputs | Single CLK and CLR lines reduce PCB routing complexity and enable atomic register updates across all six bits. |
| Low-Power CMOS | 80-μA max ICC allows integration into always-on supervisory circuits without thermal or battery-life penalty. |
| High Noise Immunity | CMOS input thresholds (VIH/VIL) provide >1.3 V noise margin at 5 V supply, resisting EMI in industrial environments. |
Applications
| Buffer/Storage Register | Shift Register Stage |
|---|---|
|
Use Scenario: Holding configuration data from an MCU during system initialization before enabling downstream peripherals. IC Role / Device Role / Timing Role: Parallel-load storage element synchronized to a clean system clock edge, isolating volatile setup values from transient bus activity. Use Value: Prevents spurious peripheral activation by ensuring all 6-bit control words are latched atomically before release. |
Use Scenario: Constructing a 6-bit serial-in/parallel-out shift register using cascaded SN74HC174DRG4 units with external feedback. IC Role / Device Role / Timing Role: Synchronous stage in multi-chip shift chain; CLK aligns bit advancement while CLR resets entire pipeline on error. Use Value: Enables deterministic 6-bit data capture per clock cycle with guaranteed setup/hold compliance at 25 MHz. |
| Pattern Generator | Digital Control Sequencer |
|
Use Scenario: Generating fixed test patterns (e.g., walking 1s, checkerboard) for FPGA I/O validation or LED matrix scanning. IC Role / Device Role / Timing Role: Deterministic pattern latch; D inputs preloaded via parallel bus, then advanced on free-running CLK for repeatable waveform generation. Use Value: Delivers jitter-free, glitch-free 6-bit sequences with <14 ns output skew between channels. |
Use Scenario: Managing state transitions in a stepper motor controller where 6 outputs define coil energization sequence. IC Role / Device Role / Timing Role: State-holding register updated only on valid step command edges; CLR resets to home position on fault detection. Use Value: Ensures precise, race-free sequencing with zero hold-time dependency - critical for avoiding motor stall or missed steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar D-type register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC175DR | Quad D-type flip-flop with individual clear per stage; different pinout and reduced channel count (4 vs. 6). | Suitable for designs requiring per-bit reset control or space-constrained layouts needing fewer registers. | Select SN74HC175DR only if per-flip-flop reset granularity is required and 6-bit width is not mandatory. |
| SN74HCT174DR | TTL-compatible input thresholds (VIH = 2 V min); identical pinout, timing, and function but optimized for 5 V-only systems interfacing legacy TTL. | Better noise margin when driven by 74LS/ALS outputs; unsuitable for 3.3 V-only or mixed-voltage operation. | Choose SN74HCT174DR exclusively for 5 V-only designs with TTL-level drivers; otherwise retain SN74HC174DRG4 for wider supply flexibility. |
Compared with SN74HC175DR and SN74HCT174DR, SN74HC174DRG4 uniquely delivers six synchronized D-flip-flops with shared control in a standard SOIC-16 footprint and 2–6 V operation - making it optimal for compact, voltage-flexible register staging where atomic multi-bit update is essential.
Availability
SN74HC174DRG4 is available at Aetrix Electronics and suitable for industrial control panels, embedded instrumentation, programmable logic interfaces, and digital test equipment requiring stable component supply and long-term manufacturability.
Supply support for SN74HC174DRG4 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 global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in high-reliability electronic components.
The SN74HC174DRG4 belongs to TI's 74HC logic family - designed for low-power, high-noise-immunity digital control in industrial, automotive, and communications infrastructure applications.
FAQ
What is the maximum clock frequency supported by SN74HC174DRG4?
The SN74HC174DRG4 supports up to 25 MHz maximum clock frequency under recommended conditions (VCC = 4.5 V, TA = 25 °C, CL = 50 pF), derived from its 20 ns minimum clock pulse width and 34 ns max tpd. At 6 V supply, fmax reaches 29 MHz. System-level timing must account for board trace delays and setup/hold margins.
Does SN74HC174DRG4 have a preset function?
No, SN74HC174DRG4 does not include a preset (SET) input. It provides only an active-low asynchronous clear (CLR) that forces all Q outputs low. To implement preset behavior, external combinational logic (e.g., OR gate on D input) or a different part such as SN74HC178 must be used.
Can SN74HC174DRG4 operate reliably at 3.3 V?
Yes, SN74HC174DRG4 is fully specified for 3.3 V operation: VIH = 2.31 V min and VIL = 0.99 V max at VCC = 3.3 V, with tpd ≈ 17 ns and output drive ≥ ±3 mA - meeting requirements for interfacing with 3.3 V microcontrollers and FPGAs without level shifters.
What is the thermal resistance (RθJA) of SN74HC174DRG4 in SOIC package?
The junction-to-ambient thermal resistance RθJA for SN74HC174DRG4 in SOIC (D) package is 73 °C/W under standard JEDEC JESD51-2 conditions. This value assumes a two-layer PCB with 1 in² copper pour; actual performance improves with enhanced heatsinking or multilayer board design.
Is SN74HC174DRG4 pin-compatible with SN74HC174N (PDIP)?
Yes, SN74HC174DRG4 (SOIC-16) and SN74HC174N (PDIP-16) share identical pin numbering and signal assignments per TI's package drawings. However, their physical dimensions, thermal profiles, and soldering methods differ - requiring layout adaptation despite functional pin compatibility.
SN74HC174DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74HC174DRG4 FAQ
1.How can I place an order for SN74HC174DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC174DRG4 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 SN74HC174DRG4 reliable?
The price and inventory of SN74HC174DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC174DRG4 is usually 5 days.
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SN74HC174DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC174DRG4 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 SN74HC174DRG4?
For technical support, including SN74HC174DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC174DRG4 requirements.
6.How does Aetrix verify that SN74HC174DRG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC174DRG4 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 SN74HC174DRG4 meets industry standards.
7.What is the process for return or replacement of SN74HC174DRG4?
All SN74HC174DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC174DRG4, 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 SN74HC174DRG4 part is unused and in its original packaging.
Return procedure for SN74HC174DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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