My Inquiry
My Account
Texas Instruments SN74AHC374NS
- Part No.:
- SN74AHC374NS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74AHC374NS.pdf
- Description:
- D-TYPE POS TRG SNGL 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:20,919
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AHC374NS from Texas Instruments is an octal D-type positive-edge-triggered flip-flop with 3-state outputs, designed for bus-oriented data latching and buffering in high-speed digital systems. It operates from 2.0 V to 5.5 V, features 8 independent D inputs, a common clock (CP), and a shared output enable (OE), and is specified for −40 °C to +125 °C operation.
For engineers reviewing the SN74AHC374NS datasheet, SN74AHC374NS pinout, SN74AHC374NS application, or SN74AHC374NS equivalent, this device serves as a CMOS-level-compatible register for bidirectional bus isolation, address/data staging in microcontroller peripherals, and synchronous I/O expansion where low propagation delay (<8.1 ns at 5 V, 15 pF) and rail-to-rail output drive are required.
Technical Context
The SN74AHC374NS implements eight edge-triggered D flip-flops sharing a single LOW-to-HIGH clock transition (CP) for simultaneous data capture and a common active-LOW 3-state output enable (OE) that places all Q outputs in high-impedance without affecting internal state. Its input structure accepts voltages up to 7.0 V regardless of VCC, and all inputs include Schmitt-trigger action for noise immunity.
It complies with JEDEC Standard No. 7-A and is pin compatible with LSTTL logic families. The device supports two distinct input voltage thresholds: CMOS-level inputs (VIH = 3.85 V min at VCC = 5.5 V) and TTL-level compatibility only in the AHCT variant - not applicable to SN74AHC374NS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | AHC (Advanced High-Speed CMOS); enables 5-V system compatibility with low power and high noise immunity |
| Supply Voltage Range | 2.0 V to 5.5 V; supports mixed-voltage interface design and battery-backed operation down to 2 V |
| Propagation Delay (tpd) | 4.4 ns (typ) at VCC = 5 V, CL = 15 pF; ensures sub-10 ns timing margin for 100+ MHz bus cycles |
| Output Drive | ±8 mA at VCC = 4.5 V; sufficient to drive 50-pF loads and standard CMOS/TTL fan-out without external buffers |
| Input Thresholds | VIH = 3.85 V (min), VIL = 1.65 V (max) at VCC = 5.5 V; provides robust 5-V CMOS logic level compatibility |
| Operating Temperature | −40 °C to +125 °C; qualified for under-hood automotive, industrial control, and extended-temperature embedded applications |
| ESD Protection | HBM > 2000 V, CDM > 1000 V; meets industrial handling requirements without additional protection circuitry |
Pinout & Package
SN74AHC374NS is supplied in an SO20 (small outline, 20-pin, 7.5 mm body width) package per JEDEC MS-013 / NXP SOT163-1 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | 3-state output enable input | Active-LOW control: asserts outputs when LOW; disables all Q pins to high-Z when HIGH - no effect on internal latch state |
| 2–9, 12, 15–19 (Q0–Q7) | 3-state flip-flop outputs | Eight buffered, edge-clocked outputs; each reflects corresponding D-input state captured on CP rising edge |
| 3–4, 7–8, 13–14, 17–18 (D0–D7) | Data inputs | Independent asynchronous inputs feeding each flip-flop; sampled only on CP rising edge per setup/hold timing |
| 10 (GND) | Ground reference | Primary 0 V return path for logic and output current; must be low-impedance for stable switching performance |
| 11 (CP) | Clock input | Positive-edge-triggered global clock; synchronizes all eight D-to-Q transfers simultaneously on LOW-to-HIGH transition |
| 20 (VCC) | Supply voltage | Single 2.0–5.5 V power rail; powers both logic core and output drivers; decoupling near pin is mandatory |
Key Features
| Feature | Design Value |
|---|---|
| CMOS-level input compatibility | Supports VIH up to 3.85 V (at VCC = 5.5 V) and VI < −0.5 V tolerance - enables direct interfacing with 5-V microcontrollers and FPGAs |
| Independent D inputs with shared CP/OE | Enables parallel data capture across 8 bits on one clock edge while allowing unified bus release via single OE signal |
| Schmitt-trigger inputs | Provides hysteresis on all inputs (typ. 0.3 V), rejecting noise on slow-rising signals such as reset lines or mechanical switch debouncing |
| Rail-to-rail output swing | VOH ≥ 4.4 V and VOL ≤ 0.1 V at 50 µA load (VCC = 4.5 V) - ensures full logic swing into CMOS loads and reliable level translation |
| High-impedance output disable | OE-driven tri-state operation isolates outputs without loading downstream buses - essential for shared-data-bus arbitration |
Applications
| Microcontroller Bus Interface | Industrial I/O Expansion |
|---|---|
Use Scenario: Interfacing an 8-bit microcontroller data bus to external memory or peripheral devices with timing-critical read/write cycles. IC Role / Device Role / Timing Role: Acts as a transparent data latch and bus driver, capturing address/data on CP edge and enabling/disabling bus access via OE synchronized to MCU control signals. Use Value: Eliminates need for discrete buffers or glue logic; supports 100+ MHz burst transfers with guaranteed tpd < 8.1 ns and setup/hold times as low as 3.0 ns. |
Use Scenario: Adding isolated, synchronized digital I/O channels to PLC modules or motor control boards requiring deterministic update timing. IC Role / Device Role / Timing Role: Provides synchronized 8-bit parallel output staging from a serial or parallel controller, with OE used for safe output activation after configuration. Use Value: Enables glitch-free output updates across all 8 channels simultaneously; high-impedance disable prevents back-driving during reconfiguration. |
| Test Equipment Signal Conditioning | Digital Audio Data Routing |
Use Scenario: Capturing and holding test pattern data in automated test equipment (ATE) for precise stimulus generation and response sampling. IC Role / Device Role / Timing Role: Functions as a precision timing register, latching parallel test vectors on a system clock edge and presenting them to DUT interfaces via controlled OE gating. Use Value: Delivers sub-10 ns propagation consistency and ±8 mA drive strength - critical for maintaining signal integrity at 50–100 MHz test frequencies. |
Use Scenario: Buffering and synchronizing parallel audio sample data (e.g., I²S TDM frames) between DSP cores and DACs in professional audio gear. IC Role / Device Role / Timing Role: Serves as a sample-aligned data register, aligning multi-channel PCM words to a master audio clock and enabling channel mute via OE. Use Value: Ensures zero-skew 8-bit word transfer and clean output disable during mute transitions - avoids pop/click artifacts in analog output stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT374NS | TTL-compatible inputs (VIH = 2.0 V min), otherwise identical pinout, timing, and 3-state behavior | Better suited for legacy 5-V TTL bus environments where input thresholds must match LS-TTL levels | Select SN74AHCT374NS only if interfacing directly with older TTL logic; SN74AHC374NS is preferred for pure CMOS or mixed-signal systems |
| 74LVC374APW | Lower VCC range (1.65–3.6 V), smaller TSSOP20 package, higher speed (tpd = 3.5 ns typ at 3.3 V), but not 5-V tolerant | Optimized for 3.3-V-only portable or low-power designs; incompatible with 5-V buses due to absolute max VI = 4.6 V | Choose 74LVC374APW for compact, high-speed 3.3-V applications; avoid where 5-V signaling or backward compatibility is required |
Compared with SN74AHCT374NS and 74LVC374APW, SN74AHC374NS uniquely balances 5-V tolerance, CMOS input thresholds, and industrial temperature support - making it the default choice for new 5-V embedded control and instrumentation designs requiring long-term reliability and interoperability.
Availability
SN74AHC374NS is available at Aetrix Electronics and suitable for microcontroller bus interface, industrial I/O expansion, test equipment signal conditioning, and digital audio data routing requiring stable component supply across automotive, industrial, and medical-grade production programs.
Supply support for SN74AHC374NS 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.
SN74AHC374NS belongs to TI's 74AHC logic family - engineered for high-speed, low-power, 5-V CMOS-compatible digital interfacing with robust noise immunity and wide operating temperature support.
FAQ
What is the maximum clock frequency supported by SN74AHC374NS?
SN74AHC374NS supports up to 130 MHz maximum frequency (fmax) at VCC = 5.0 V and CL = 15 pF, and 85 MHz at CL = 50 pF. These values are measured under recommended operating conditions and assume proper PCB layout, decoupling, and signal integrity controls. The actual usable frequency in a given design depends on board parasitics and load capacitance - SN74AHC374NS datasheet Table 7 provides full derating curves across voltage and temperature.
Does SN74AHC374NS support 3.3-V operation?
Yes, SN74AHC374NS is fully specified for operation from 2.0 V to 5.5 V, including 3.3 V nominal supply. At VCC = 3.3 V, it delivers typical propagation delay of 6.4 ns (CL = 15 pF) and maintains valid CMOS input thresholds (VIH = 2.1 V min, VIL = 0.9 V max). All static and dynamic parameters in the datasheet are guaranteed across this full voltage range.
Can SN74AHC374NS inputs tolerate 5-V signals when powered from 3.3 V?
Yes, SN74AHC374NS inputs are 5-V tolerant: they accept VI up to 7.0 V regardless of VCC level, per Absolute Maximum Ratings (Table 4). This allows safe interfacing with 5-V peripherals while SN74AHC374NS operates at 3.3 V - no level-shifting circuitry is required, simplifying mixed-voltage system design.
What is the purpose of the Schmitt-trigger inputs on SN74AHC374NS?
The Schmitt-trigger inputs on SN74AHC374NS provide hysteresis (typically 0.3 V) to reject noise and ensure clean logic transitions on slow or noisy signals - such as pushbutton inputs, reset lines, or long traces. This eliminates false triggering and improves system reliability without requiring external RC filtering, making SN74AHC374NS suitable for harsh industrial environments.
How does the output enable (OE) function interact with the internal flip-flop state in SN74AHC374NS?
In SN74AHC374NS, the OE input controls only the output drivers - it has no effect on the internal latch state. When OE is HIGH, all Q outputs go to high-impedance (Z), but stored data remains intact and unaffected. When OE returns LOW, previously latched data appears immediately at the outputs. This allows safe bus sharing and hot-swapping without disturbing register contents.
SN74AHC374NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74AHC374NS FAQ
1.How can I place an order for SN74AHC374NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC374NS 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 SN74AHC374NS reliable?
The price and inventory of SN74AHC374NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC374NS is usually 5 days.
3.What payment methods are accepted for SN74AHC374NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC374NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC374NS?
SN74AHC374NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC374NS 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 SN74AHC374NS?
For technical support, including SN74AHC374NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC374NS requirements.
6.How does Aetrix verify that SN74AHC374NS is sourced from the original manufacturer or authorized distributors?
All SN74AHC374NS 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 SN74AHC374NS meets industry standards.
7.What is the process for return or replacement of SN74AHC374NS?
All SN74AHC374NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC374NS, 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 SN74AHC374NS part is unused and in its original packaging.
Return procedure for SN74AHC374NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AHC374NS 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…
