My Inquiry
My Account
Texas Instruments SN74AHC174D
- Part No.:
- SN74AHC174D
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AHC174D.pdf
- Description:
- IC FF D-TYPE SNGL 6BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,180
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AHC174D from Texas Instruments is a hex D-type positive-edge-triggered flip-flop with asynchronous clear (CLR), designed for 2V–5.5V operation, featuring six independent single-rail outputs and latch-up immunity exceeding 250 mA per JESD17 - used in synchronous data storage and clock-domain interfacing within industrial control logic.
For engineers reviewing the SN74AHC174D datasheet, SN74AHC174D pinout, SN74AHC174D application, or SN74AHC174D equivalent, key selection criteria include supply voltage range (2–5.5 V), propagation delay (≤14.5 ns at 3.3 V), output drive strength (±4 mA at 3.3 V), and SOIC-16 package compatibility with legacy board layouts.
Technical Context
The SN74AHC174D implements six edge-triggered D latches synchronized to the rising edge of CLK, with independent asynchronous reset via CLR. Each flip-flop transfers data from its D input to Q output only on CLK↑, while CLR forces Q low regardless of clock state.
It operates across –40°C to +85°C with CMOS-level input thresholds (VIH = 2.1 V min at VCC = 3 V), supports 15 pF load capacitance up to 1701 MHz fmax at 3.3 V, and exhibits 15.2 pF typical power dissipation capacitance - enabling low-noise, high-speed register staging in mixed-voltage digital systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports direct interface with 3.3 V and 5 V logic families without level shifters. |
| Propagation Delay (tPLH/tPHL) | ≤14.5 ns at VCC = 3.3 V, CL = 50 pF - ensures sub-15 ns timing margin for 50-MHz synchronous designs. |
| Output Drive (IOL/IOH) | ±4 mA at 3.3 V - sufficient to drive standard CMOS loads or fan-out to ≥10 AHC inputs. |
| Setup/Hold Time (tsu/th) | 5 ns / 0 ns at 3.3 V - minimal data setup requirement simplifies timing closure in high-speed register chains. |
| Input Capacitance (Ci) | 10 pF max - reduces capacitive loading on preceding drivers and minimizes signal integrity degradation. |
| Latch-up Immunity | >250 mA per JESD17 - meets industrial-grade robustness requirements for transient overvoltage resilience. |
| Operating Temperature | –40°C to +85°C - qualified for extended-temperature industrial and automotive under-hood applications. |
Pinout & Package
SN74AHC174D is housed in a 16-pin SOIC (D) package measuring 9.9 mm × 6.0 mm (body: 9.9 mm × 3.9 mm), with gull-wing leads, RoHS-compliant NiPdAu finish, and MSL Level-1 rating for unlimited reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLR (Pin 1) | Asynchronous Clear Input | Active-low global reset: forces all six Q outputs low independently of CLK timing. |
| CLK (Pin 9) | Clock Input | Positive-edge-sensitive trigger: samples all six D inputs simultaneously on rising edge. |
| 1D–6D (Pins 3,4,6,11,13,14) | Data Inputs | Independent D inputs per flip-flop; each must meet tsu = 5 ns before CLK↑ at 3.3 V. |
| 1Q–6Q (Pins 2,5,7,10,12,15) | True Outputs | Non-inverting registered outputs; no internal feedback or tri-state capability. |
| VCC (Pin 16) | Power Supply | Primary supply rail; requires local 0.1 µF bypass capacitor placed adjacent to pin. |
| GND (Pin 8) | Ground Reference | Common return path for all logic and switching currents; connects to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2 V–5.5 V operation enables interoperability across 3.3 V microcontrollers and 5 V legacy peripherals. |
| Edge-Triggered Synchronization | Rising-edge CLK sensitivity ensures deterministic sampling and eliminates metastability risk in synchronous FIFOs. |
| Asynchronous Reset | Dedicated CLR pin allows immediate, clock-independent initialization of all six registers - critical for system boot sequencing. |
| High-Speed Performance | fmax = 1701 MHz at 3.3 V/15 pF confirms suitability for high-frequency clock division and pattern generation up to ~1.7 GHz. |
| Low Power Dissipation | ICC = 40 µA max at 5.5 V supports battery-backed or energy-constrained register storage applications. |
Applications
| Buffer/Storage Registers | Shift Registers |
|---|---|
Use Scenario: Holding parallel data between an ADC interface and a microcontroller's parallel bus during conversion cycles. IC Role / Device Role / Timing Role: Six-bit synchronous latch providing glitch-free data capture aligned to system clock edges. Use Value: Eliminates need for external SRAM or FPGA-based buffering by delivering deterministic, low-latency register staging. | Use Scenario: Serial-to-parallel conversion in LED matrix drivers using cascaded SN74AHC174D units. IC Role / Device Role / Timing Role: Stage element in multi-chip shift chain; CLK and CLR shared across devices for synchronized shifting. Use Value: Enables precise 6-bit segment control per stage with minimal PCB area versus discrete logic or microcontroller GPIO expansion. |
| Pattern Generators | Industrial Control Logic |
Use Scenario: Generating fixed test sequences for boundary-scan validation of PCB interconnects. IC Role / Device Role / Timing Role: Clock-driven finite-state register bank producing repeatable binary patterns on Q outputs. Use Value: Delivers stable, jitter-free 6-bit patterns without software overhead - ideal for automated test equipment (ATE) stimulus. | Use Scenario: Storing machine-state bits (e.g., motor direction, valve status) in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Nonvolatile register holding real-time I/O states updated synchronously with scan cycle clock. Use Value: Provides deterministic, ESD-hardened storage immune to noise-induced bit flips in electrically noisy factory environments. |
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 |
|---|---|---|---|
| SN74AHCT174D | TTL-compatible input thresholds (VIH = 2 V min); identical pinout and timing. | Better suited for mixed 5 V TTL/CMOS systems where input noise margins exceed AHC thresholds. | Select when interfacing with legacy 5 V TTL outputs or when VIH > 2 V is required for noise immunity. |
| 74LVC174PW | Lower VCC range (1.65–3.6 V); TSSOP-16 package; 3.3 V optimized with 5 ns tpd. | Targeted for space-constrained 3.3 V-only designs; not compatible with 5 V operation. | Choose for compact, low-voltage embedded systems where 5 V tolerance is unnecessary and board area is critical. |
Compared with SN74AHCT174D and 74LVC174PW, the SN74AHC174D uniquely balances wide supply flexibility (2–5.5 V), industrial temperature range, and SOIC-16 footprint - making it optimal for retrofitting legacy 5 V boards while supporting modern 3.3 V subsystems without redesign.
Availability
SN74AHC174D is available at Aetrix Electronics and suitable for industrial control logic, buffer/storage register implementation, and pattern generator circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC174D 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 embedded processing solutions, with leadership in logic, power management, and signal chain technologies.
The SN74AHC174D belongs to TI's advanced high-speed CMOS (AHC) logic family, engineered for low-power, high-noise-immunity digital interfacing in industrial automation, test equipment, and communications infrastructure.
FAQ
What is the maximum clock frequency supported by SN74AHC174D?
The SN74AHC174D supports a maximum clock frequency of 1701 MHz at VCC = 3.3 V with 15 pF load capacitance, and 2401 MHz at VCC = 5 V under the same condition. These values reflect guaranteed AC switching performance per TI's SCLS425H datasheet, measured at TA = 25°C with specified test conditions - actual system-level fmax depends on PCB layout, load, and temperature.
Does SN74AHC174D support 3.3 V-only operation?
Yes, SN74AHC174D fully supports 3.3 V-only operation with guaranteed performance across –40°C to +85°C. At VCC = 3.3 V ± 0.3 V, it delivers tPLH/tPHL ≤ 14.5 ns (CL = 50 pF), IOH/IOL = ±4 mA, and VIH/VIL thresholds compatible with standard 3.3 V CMOS logic families - no level translation required.
Is SN74AHC174D pin-compatible with older 74LS174 or 74HC174 devices?
SN74AHC174D shares identical pinout and function with 74HC174 and 74LS174 in SOIC-16 (D) package, including CLK, CLR, D, and Q assignments. However, electrical characteristics differ: AHC offers higher speed, lower power, and wider VCC range than LS/HC - direct replacement is feasible but requires verification of timing margins and voltage compatibility in the target system.
What is the recommended bypass capacitor for SN74AHC174D?
Texas Instruments recommends a 0.1 µF ceramic bypass capacitor placed as close as possible to the VCC (Pin 16) and GND (Pin 8) pins of SN74AHC174D. For enhanced noise suppression across frequencies, pairing this with a 1 µF capacitor in parallel is acceptable - both must be mounted with minimal trace length to maintain low-inductance paths.
Can unused inputs on SN74AHC174D be left floating?
No, unused inputs on SN74AHC174D must never be left floating. All unconnected D, CLK, or CLR inputs must be tied to a valid logic level (VCC or GND) per TI's guidance in SCLS425H Section 8.2.1. Floating inputs cause undefined output states, increased ICC, and potential oscillation due to CMOS input structure susceptibility to noise.
SN74AHC174D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 6
- Clock Frequency:
- 180 MHz
- Max Propagation Delay @ V, Max CL:
- 9.2ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 1.7 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74AHC174D FAQ
1.How can I place an order for SN74AHC174D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC174D 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 SN74AHC174D reliable?
The price and inventory of SN74AHC174D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC174D is usually 5 days.
3.What payment methods are accepted for SN74AHC174D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC174D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC174D?
SN74AHC174D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC174D 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 SN74AHC174D?
For technical support, including SN74AHC174D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC174D requirements.
6.How does Aetrix verify that SN74AHC174D is sourced from the original manufacturer or authorized distributors?
All SN74AHC174D 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 SN74AHC174D meets industry standards.
7.What is the process for return or replacement of SN74AHC174D?
All SN74AHC174D units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC174D, 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 SN74AHC174D part is unused and in its original packaging.
Return procedure for SN74AHC174D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AHC174D Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
