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Texas Instruments SN74AHCT174NSR
- Part No.:
- SN74AHCT174NSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AHCT174NSR.pdf
- Description:
- IC FF D-TYPE SNGL 6BIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,961
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Product details
Overview
SN74AHCT174NSR from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with asynchronous active-low clear, designed for synchronous data latching in digital logic systems. It operates at 4.5–5.5 V, supports TTL-voltage-compatible inputs, delivers ±8 mA output drive, and functions across –40°C to +85°C for industrial register applications.
For engineers reviewing the SN74AHCT174NSR datasheet, SN74AHCT174NSR pinout, SN74AHCT174NSR application, or SN74AHCT174NSR equivalent, this device serves as a 16-pin SOP-packaged storage element requiring precise clock-edge timing, low-power static operation (ICC ≤ 40 μA), and robust noise immunity (VIH = 2 V, VIL = 0.8 V) in buffer, shift, and pattern-generation circuits.
Technical Context
The SN74AHCT174NSR implements six independent D-type flip-flops sharing a common clock (CLK) and global clear (CLR) input, with all outputs updated on the rising edge of CLK. Its TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) enable direct interfacing with legacy 5-V logic families without level translation.
Each channel features single-rail Q outputs only-no complementary Q̅-and exhibits propagation delays of tPLH/tPHL ≤ 9 ns (CL = 15 pF) and maximum operating frequency of 135 MHz under nominal conditions. Latch-up immunity exceeds 250 mA per JESD17, ensuring reliability in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V digital systems and tolerance to rail droop. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - enables direct connection to TTL outputs without interface circuitry. |
| Output Drive | ±8 mA - sufficient to drive multiple 74-series loads or small capacitive buses (≤50 pF). |
| Propagation Delay | tPLH/tPHL ≤ 9 ns (CL = 15 pF) - supports high-speed register chaining in pipeline stages. |
| Max Clock Frequency | 135 MHz (CL = 15 pF) - suitable for fast data capture in pattern generators and shift registers. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and automation equipment. |
| Power Consumption | ICC ≤ 40 μA (max) - enables low-quiescent-power operation in always-on logic subsystems. |
Pinout & Package
SOP-16 (NS package), body size 10.2 mm × 5.3 mm, height ≤ 2.00 mm, with gull-wing leads and pin 1 index area marked on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous active-low clear - resets all six Q outputs to logic low regardless of clock state. |
| 2 | 1Q | Channel 1 output - provides registered data from D1 on rising CLK edge. |
| 3 | 1D | Channel 1 data input - sampled at CLK↑ if CLR is high. |
| 4 | 2D | Channel 2 data input - independent of other channels; no internal inter-channel coupling. |
| 5 | 2Q | Channel 2 output - synchronized to same CLK edge as 1Q, but isolated timing path. |
| 6 | 3D | Channel 3 data input - part of six fully independent D-flip-flop cells. |
| 7 | 3Q | Channel 3 output - maintains state until next CLK↑, unaffected by other Q outputs. |
| 8 | GND | Ground reference - must be low-impedance; shared return for all six channels and internal logic. |
| 9 | CLK | Global clock input - rising-edge sensitive; all six flip-flops update simultaneously on one edge. |
| 10 | 4Q | Channel 4 output - identical timing behavior to 1Q/2Q/3Q; no skew specification between channels. |
| 11 | 4D | Channel 4 data input - accepts new data during setup window before CLK↑. |
| 12 | 5Q | Channel 5 output - single-rail only; no Q̅ available on any channel. |
| 13 | 5D | Channel 5 data input - requires valid VIH/VIL levels during tsu = 5 ns before CLK↑. |
| 14 | 6D | Channel 6 data input - final D input in hex configuration; no additional control pins. |
| 15 | 6Q | Channel 6 output - completes full 6-bit parallel register capability. |
| 16 | VCC | Positive supply - decoupling capacitor (0.1 μF) required near pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-voltage-compatible inputs | Accepts 0–5.5 V input signals with guaranteed VIH = 2 V / VIL = 0.8 V - eliminates need for external level shifters when interfacing with legacy 5-V TTL sources. |
| Hex D-type architecture with shared CLK/CLR | Enables compact 6-bit register implementation using one IC instead of six discrete flip-flops - reduces PCB area and interconnect complexity. |
| Positive-edge-triggered operation | Ensures deterministic sampling at precise clock transitions - critical for setup/hold timing compliance in synchronous state machines. |
| Asynchronous active-low clear | Allows immediate reset of all outputs independent of clock phase - essential for system initialization and fault recovery sequences. |
| Latch-up immunity >250 mA | Meets JESD17 Class II requirements - protects against destructive current flow during transient overvoltage or ESD events in industrial settings. |
Applications
| Buffer/Storage Registers | Shift Registers |
|---|---|
Use Scenario: Holding 6-bit sensor data between ADC sampling and microcontroller read cycles in an industrial PLC module. IC Role / Device Role / Timing Role: Synchronous data latch providing metastability-resistant storage aligned to system clock domain. Use Value: Eliminates race conditions during multi-cycle data handoff while maintaining signal integrity across temperature extremes. |
Use Scenario: Serial-to-parallel conversion of UART RX data stream into parallel byte format for FPGA-based protocol decoder. IC Role / Device Role / Timing Role: Edge-triggered shift register stage with common clock enabling bit-serial input alignment. Use Value: Achieves deterministic 6-bit parallel output within 9 ns propagation delay, supporting baud rates up to 10 Mbps. |
| Pattern Generators | State Machine Control |
Use Scenario: Generating repeating test vectors (e.g., 010101, 101010) for validating digital I/O timing margins on a motor driver board. IC Role / Device Role / Timing Role: Clocked feedback-free register feeding combinational logic to produce deterministic output sequences. Use Value: Delivers jitter-free, cycle-accurate patterns at up to 135 MHz - exceeding typical MCU GPIO toggle limits. |
Use Scenario: Implementing 6-bit state encoding for a finite-state machine controlling HVAC damper actuation sequence. IC Role / Device Role / Timing Role: Synchronous state register updated only on CLK↑, with CLR enabling safe power-on reset. Use Value: Guarantees known initial state and prevents illegal state entry during brown-out recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT174DR | Same logic function and pinout, but SOIC-16 (D package); higher RθJA (73°C/W vs NS's 64°C/W); identical electrical specs. | Preferred where board space allows larger SOIC footprint and thermal margin is less constrained. | Select SN74HCT174DR only if SOP-16 layout constraints prohibit NS package; verify thermal derating at max ambient. |
| 74LVX174M | Lower voltage range (2.7–3.6 V), different input thresholds (VIH = 2.0 V @ VCC = 3.3 V), not TTL-compatible; TSSOP-16. | Applicable only in 3.3-V systems; requires level-shifting for 5-V interface, limiting drop-in use. | Choose 74LVX174M exclusively for mixed-voltage designs where SN74AHCT174NSR's 5-V operation is incompatible. |
Compared with SN74AHCT174NSR, SN74HCT174DR offers identical functionality in a thermally less efficient package, while 74LVX174M shifts voltage domain and forfeits TTL compatibility - making SN74AHCT174NSR the optimal choice for industrial 5-V register applications requiring SOP-16 fit and proven noise immunity.
Availability
SN74AHCT174NSR is available at Aetrix Electronics and suitable for industrial control systems, programmable logic modules, and embedded instrumentation requiring stable component supply with long-term manufacturability and RoHS-compliant packaging.
Supply support for SN74AHCT174NSR 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 and embedded processing technologies, with decades of experience delivering high-reliability logic, power, and signal-chain solutions.
The SN74AHCT174NSR belongs to TI's 74AHCT advanced high-speed CMOS logic family, engineered for robust 5-V operation with TTL compatibility and industrial temperature resilience - targeting register-intensive digital control and data-path applications.
FAQ
What is the maximum clock frequency supported by the SN74AHCT174NSR?
The SN74AHCT174NSR supports a maximum clock frequency of 135 MHz under recommended conditions (VCC = 5 V ± 0.5 V, CL = 15 pF, TA = 25°C). At higher load capacitances (e.g., CL = 50 pF), the usable frequency drops to 115 MHz. These values are measured per TI's switching characteristics table and reflect guaranteed timing performance across the full industrial temperature range.
Does the SN74AHCT174NSR provide complementary Q̅ outputs?
No, the SN74AHCT174NSR provides only true Q outputs for each of its six channels - there are no dedicated Q̅ (inverted) outputs. The device is specified as having "single-rail outputs" in its official feature list, and the logic diagram and pinout confirm Q-only terminals (pins 2, 5, 7, 10, 12, 15). Complementary outputs require external inverters or alternate devices like the SN74AHCT175.
What is the purpose of the CLR pin on the SN74AHCT174NSR?
The CLR (pin 1) on the SN74AHCT174NSR is an asynchronous active-low clear input that forces all six Q outputs to logic low immediately - independent of the clock signal. When CLR is pulled low, outputs respond within tPHL ≤ 13 ns (CL = 50 pF), and remain low until CLR returns high and a subsequent CLK↑ occurs. This enables deterministic system-wide reset without waiting for clock edges.
Can the SN74AHCT174NSR operate reliably at 3.3 V supply?
No, the SN74AHCT174NSR is not specified for 3.3 V operation. Its recommended supply range is strictly 4.5 V to 5.5 V, and its TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) assume a 5-V rail. Operating below 4.5 V risks failure to meet AC/DC specifications, including setup time, propagation delay, and noise margins - use 74LVX174 or 74LVC174 for 3.3-V systems.
Is the SN74AHCT174NSR pin-compatible with other 74xx174 variants?
Yes, the SN74AHCT174NSR shares identical pinout and logic function with all industry-standard 74xx174-family devices in 16-pin packages (including SN74HCT174, SN74LS174, and SN74ALS174), regardless of suffix or package type (NS, D, DB, PW). Pin assignments for CLK, CLR, Dn, Qn, VCC, and GND are standardized per JEDEC MS-012, enabling direct substitution where voltage and speed requirements align.
SN74AHCT174NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 115 MHz
- Max Propagation Delay @ V, Max CL:
- 8.8ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 2 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74AHCT174NSR FAQ
1.How can I place an order for SN74AHCT174NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT174NSR 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 SN74AHCT174NSR reliable?
The price and inventory of SN74AHCT174NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT174NSR is usually 5 days.
3.What payment methods are accepted for SN74AHCT174NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT174NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT174NSR?
SN74AHCT174NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT174NSR 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 SN74AHCT174NSR?
For technical support, including SN74AHCT174NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT174NSR requirements.
6.How does Aetrix verify that SN74AHCT174NSR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT174NSR 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 SN74AHCT174NSR meets industry standards.
7.What is the process for return or replacement of SN74AHCT174NSR?
All SN74AHCT174NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT174NSR, 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 SN74AHCT174NSR part is unused and in its original packaging.
Return procedure for SN74AHCT174NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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