My Inquiry
My Account
Texas Instruments SN74HC374NS
- Part No.:
- SN74HC374NS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC374NS.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:609
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74HC374NS from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus interface and register applications in 5 V digital systems. It features eight independent D-flip-flops synchronized on the rising clock edge, ±6 mA output drive at 5 V, 14 ns typical propagation delay, and operates across 2–6 V supply range. Used in I/O port buffering and bidirectional data bus control.
For engineers reviewing the SN74HC374NS datasheet, SN74HC374NS pinout, SN74HC374NS application, or SN74HC374NS equivalent, key selection criteria include 3-state output timing (ten/tdis ≤ 38 ns at 5 V), wide VCC tolerance (2–6 V), low ICC (80 µA max), and SO package compatibility with legacy through-hole layouts.
Technical Context
The SN74HC374NS implements eight synchronous D-type latches triggered exclusively on the rising edge of CLK, with independent data capture and storage per bit. Its 3-state outputs are controlled by a common active-low OE input that does not affect internal state retention - enabling dynamic bus sharing without disrupting registered data.
Each flip-flop exhibits rail-to-rail CMOS logic thresholds (VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V), supports capacitive loads up to 50 pF with guaranteed tpd ≤ 45 ns, and maintains functional operation across –40°C to +85°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - enables direct interfacing with 3.3 V and 5 V logic families without level shifters. |
| tpd (CLK→Q) | 45 ns max at VCC = 4.5 V, CL = 50 pF - ensures reliable timing margin in 20 MHz bus systems. |
| Output Drive | ±6 mA at VCC = 5 V - drives 15 LSTTL loads directly, eliminating external buffers in medium-fanout designs. |
| ICC (max) | 80 µA at VCC = 6 V - supports low-static-power operation in battery-backed or energy-sensitive control registers. |
| Input Current | ±1 µA max - prevents signal integrity degradation in high-impedance routing or long trace applications. |
| OE Disable Time | 32 ns max (tdis) at VCC = 6 V - guarantees fast bus release for time-critical arbitration protocols. |
Pinout & Package
SN74HC374NS is housed in a 20-pin Small Outline Package (SO) with 15.00 mm × 5.30 mm body size, gull-wing leads, and standard 0.65 mm pitch. The package is RoHS-compliant, moisture sensitivity level 1, and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data inputs (D1–D8) | Asynchronous parallel load path; each accepts standard CMOS logic levels for independent bit registration. |
| 9 | Ground (GND) | Reference return for all internal logic and output drivers; must be low-impedance connection to minimize ground bounce. |
| 10, 11, 13, 14, 15, 16, 17, 18 | Outputs (Q1–Q8) | 3-state CMOS outputs; high-impedance when OE = high, actively driven otherwise - enables shared bus topology. |
| 12 | Output enable (OE) | Active-low global control; asserts high-impedance state without affecting internal flip-flop states or clock synchronization. |
| 19 | Clock (CLK) | Rising-edge-triggered global clock input; synchronizes all eight D-to-Q transfers simultaneously with setup/hold times of 25 ns/5 ns at 4.5 V. |
| 20 | Supply (VCC) | Primary power rail; requires local 0.1 µF ceramic bypass capacitor placed within 5 mm of pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flop architecture | Eight independent, edge-triggered registers in one SO-20 package - reduces board space vs. discrete 74HC74 implementations. |
| 3-state outputs with OE control | Enables direct connection to multipoint data buses without external tri-state logic or pull-up resistors. |
| Wide supply voltage range (2–6 V) | Supports mixed-voltage system design and brown-out resilience down to 2 V without functional loss. |
| Low power consumption | 80 µA max ICC allows use in always-on control registers without thermal derating in compact enclosures. |
| High noise immunity | CMOS input thresholds (VIH/VIL = 70%/30% of VCC) provide >1.3 V noise margin at 5 V operation. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Isolating microcontroller GPIOs from noisy 12 V automotive loads via optocoupler-driven relay banks. IC Role / Device Role / Timing Role: Output latch holding command states during MCU interrupt latency; 3-state outputs decouple relay drivers during reconfiguration. Use Value: Eliminates software polling overhead by freezing outputs while firmware updates status registers - improves deterministic response under EMI stress. |
Use Scenario: Buffering CAN transceiver TX/RX lines to isolate MCU pins from bus transients and ESD events. IC Role / Device Role / Timing Role: Synchronized data staging between MCU and physical layer; OE enables hot-swap-safe bus disconnection during fault recovery. Use Value: Prevents bus contention during CAN node reset cycles - maintains network integrity without requiring external bus arbitration logic. |
| Test Equipment Digital Pattern Generators | Legacy Industrial HMI Panels |
|
Use Scenario: Generating precise, glitch-free parallel stimulus patterns for ASIC validation using FPGA-controlled vector memory. IC Role / Device Role / Timing Role: High-speed output register synchronized to FPGA clock domain; tpd ≤ 45 ns ensures sub-20 MHz pattern stability. Use Value: Enables deterministic timing alignment across 8-bit data paths without skew-compensation circuitry or layout tuning. |
Use Scenario: Interfacing modern ARM-based controllers to legacy 8-bit parallel LCD modules with fixed timing windows. IC Role / Device Role / Timing Role: Level-shifting and timing-retiming bridge; SO package footprint matches original PDIP-20 sockets with minimal PCB redesign. Use Value: Maintains backward compatibility with existing 5 V display interfaces while supporting lower-power host processors - extends product lifecycle without hardware revision. |
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 |
|---|---|---|---|
| SN74HC574N | Same logic function but PDIP-20 package; lacks SO-20 footprint compatibility and has higher RθJA (84.6°C/W vs. 113.4°C/W). | Preferred for prototyping with breadboards or legacy through-hole assembly; unsuitable for surface-mount volume production. | Select SN74HC574N only if manual soldering or socket-based testing is required - avoid for automated SO-reflow processes. |
| 74LVC374APW | 3.3 V-only operation (1.65–3.6 V); faster tpd (3.5 ns typ), but incompatible with 5 V buses without level translation. | Optimized for low-voltage portable electronics; cannot replace SN74HC374NS in mixed 5 V/3.3 V systems without additional interface components. | Choose 74LVC374APW only in fully 3.3 V domains where speed > 25 MHz is mandatory - not a drop-in replacement for 5 V industrial control. |
Compared with SN74HC574N and 74LVC374APW, SN74HC374NS uniquely balances 5 V bus compatibility, SO-20 surface-mount readiness, and industrial temperature range - making it optimal for retrofitting legacy 5 V systems with modern SMT manufacturing.
Availability
SN74HC374NS is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, test equipment digital pattern generators, and legacy industrial HMI panels requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HC374NS 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 50 years of industrial-grade component development.
The SN74HC374NS belongs to TI's 74HC logic family, engineered for robust 5 V digital interfacing in harsh environments - emphasizing noise immunity, wide voltage tolerance, and long-term reliability in control and instrumentation systems.
FAQ
What is the maximum clock frequency supported by SN74HC374NS at 5 V operation?
The SN74HC374NS supports a maximum clock frequency of 24 MHz at VCC = 4.5 V and TA = 25°C, with timing validated under CL = 50 pF loading. At full industrial temperature range (–40°C to +85°C), derating applies - consult TI's SCLS141G datasheet Section 5.5 for fmax vs. temperature curves. SN74HC374NS maintains functional integrity up to 20 MHz across its full operating range.
Can SN74HC374NS be used with a 3.3 V microcontroller without level shifting?
Yes, SN74HC374NS operates reliably with 3.3 V logic inputs: VIH is specified at 2.31 V min (70% of 3.3 V) and VIL at 0.99 V max (30% of 3.3 V) per TI's recommended conditions. However, its outputs swing rail-to-rail (0 V to 3.3 V), so interfacing with 5 V-tolerant peripherals requires verification of input voltage limits - SN74HC374NS itself does not require level shifters for 3.3 V control signals.
How does the OE pin behavior affect internal flip-flop state during bus contention scenarios?
The OE pin on SN74HC374NS controls only output driver enablement and has no effect on internal flip-flop operation. While OE = high forces Q outputs into high-impedance, stored D-input states remain latched and fully retain their values - allowing uninterrupted data retention and new D-input sampling during bus release periods. This enables safe hot-plug and arbitration sequences without data corruption.
What is the thermal resistance (RθJA) of SN74HC374NS and how does it impact PCB layout?
SN74HC374NS has a junction-to-ambient thermal resistance (RθJA) of 113.4°C/W in its SO-20 package. To maintain TJ < 125°C at 80 µA ICC, ambient temperature must stay below 85°C with minimal self-heating. No copper pour or thermal vias are required for typical operation, but placement near airflow or away from heat sources is advised for high-density boards.
Is SN74HC374NS pin-compatible with other 74HC374 variants like SN74HC374N or SN74HC374PW?
Yes, SN74HC374NS shares identical pinout and logic functionality with all 74HC374 variants including SN74HC374N (PDIP-20) and SN74HC374PW (TSSOP-20). Pin assignments for D1–D8, Q1–Q8, CLK, OE, VCC, and GND are standardized across packages - enabling direct substitution where mechanical fit permits. Footprint adaptation is required only for package-specific land patterns.
SN74HC374NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 70 MHz
- Max Propagation Delay @ V, Max CL:
- 31ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 7.8mA, 7.8mA
- 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:
- 20-SO
SN74HC374NS FAQ
1.How can I place an order for SN74HC374NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC374NS 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 SN74HC374NS reliable?
The price and inventory of SN74HC374NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC374NS is usually 5 days.
3.What payment methods are accepted for SN74HC374NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC374NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC374NS?
SN74HC374NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC374NS 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 SN74HC374NS?
For technical support, including SN74HC374NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC374NS requirements.
6.How does Aetrix verify that SN74HC374NS is sourced from the original manufacturer or authorized distributors?
All SN74HC374NS 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 SN74HC374NS meets industry standards.
7.What is the process for return or replacement of SN74HC374NS?
All SN74HC374NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC374NS, 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 SN74HC374NS part is unused and in its original packaging.
Return procedure for SN74HC374NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74HC374NS 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…
