My Inquiry
My Account
STMicroelectronics 74AC374MTR
- Part No.:
- 74AC374MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74AC374MTR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,782
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74AC374MTR from STMicroelectronics is an advanced high-speed CMOS octal D-type flip-flop with 3-state non-inverting outputs, designed for synchronous data latching and bus interface control. It features 8-bit edge-triggered storage, active-low 3-state output enable (OE), 270 MHz max clock frequency at 5V, 2V–6V operating voltage range, and symmetrical ±24 mA output drive capability.
For engineers reviewing the 74AC374MTR datasheet, 74AC374MTR pinout, 74AC374MTR application, or 74AC374MTR equivalent, key selection criteria include propagation delay matching (tPLH ≅ tPHL), 50 Ω transmission line driving compliance, latch-up immunity, ESD tolerance (2 kV), and pin/function compatibility with legacy 74-series logic.
Technical Context
The 74AC374 operates as a positive-edge-triggered register: on the LOW-to-HIGH transition of CK, D0–D7 inputs are captured and presented at Q0–Q7 outputs. OE controls output state independently-low enables normal logic levels; high forces high-impedance-without affecting internal flip-flop operation or data retention.
It uses sub-micron C2MOS technology with double-layer metal wiring, enabling low ICC (4 µA max at 25°C), high noise immunity (VNIH/VNIL = 28% VCC min), and balanced AC performance across temperature ranges (–55°C to +125°C) and supply voltages (2V–6V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Clock Frequency | 270 MHz (typ.) at VCC = 5V - supports high-speed synchronous bus buffering |
| Propagation Delay (CK→Q) | 5.0 ns (min), 12.0 ns (max) at 5V - ensures tight timing alignment in parallel data paths |
| Output Drive Strength | ±24 mA (min) - directly drives 50 Ω transmission lines without external termination |
| Supply Voltage Range | 2V to 6V - interoperable across 3.3V and 5V logic domains |
| Quiescent Current | 4 µA (max) at TA = 25°C - enables ultra-low static power in battery-backed or standby systems |
| Input Noise Immunity | 28% VCC (min) - rejects common-mode noise in electrically noisy industrial environments |
| ESD Protection | 2 kV HBM - safeguards against handling-induced discharge during assembly and test |
Pinout & Package
TSSOP-20 package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, lead-free, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low 3-state output enable - decouples outputs from bus without disrupting internal register state |
| 2,5,6,9,12,15,16,19 | Q0–Q7 | Non-inverting registered outputs - provide synchronized, high-drive data latched on CK rising edge |
| 3,4,7,8,13,14,17,18 | D0–D7 | Data inputs - sampled only on CK rising edge; unaffected by OE status |
| 11 | CK | Clock input - LOW-to-HIGH edge triggers simultaneous capture of all 8 D inputs |
| 10 | GND | Ground reference - return path for all I/O and supply currents |
| 20 | VCC | Positive supply - powers logic core and output drivers; supports 2V–6V operation |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered register architecture | Single-cycle, deterministic data capture on CK rising edge - eliminates metastability risk in synchronous designs |
| Independent output enable | OE disables outputs without halting internal clocking - enables concurrent data loading and bus release |
| Symmetrical output impedance | |IOH| = |IOL| ≥ 24 mA - minimizes signal distortion on bidirectional or shared buses |
| Wide voltage operation | VCC = 2V–6V - allows direct interfacing between mixed-voltage subsystems (e.g., 3.3V MCU to 5V peripheral) |
| Latch-up immunity enhancement | Improved process-level protection - prevents destructive parasitic SCR activation under overvoltage transients |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module Bus Buffer |
|---|---|
Use Scenario: Isolating microcontroller GPIO banks from noisy 24V I/O expansion cards via a shared parallel bus. IC Role / Device Role / Timing Role: Synchronous data latch and 3-state bus driver - captures MCU writes on CK edge and presents them to backplane only when OE is asserted. Use Value: Prevents bus contention during hot-swap events and reduces EMI through controlled edge rates and 50 Ω line driving. | Use Scenario: Temporarily storing sensor readings (e.g., door lock status, window position) before CAN message framing. IC Role / Device Role / Timing Role: Edge-triggered register holding 8-bit status bits - clocked by MCU timer output to align sampling with vehicle power cycle transitions. Use Value: Ensures atomic read of volatile sensor states without software polling overhead or race conditions. |
| Test Equipment Digital Pattern Generator | Legacy Embedded System Memory-Mapped I/O Expander |
Use Scenario: Generating precise, skew-controlled parallel stimulus waveforms for IC functional testing. IC Role / Device Role / Timing Role: High-speed waveform register - loaded via fast parallel bus and clocked at up to 270 MHz to produce deterministic digital patterns. Use Value: Achieves sub-5 ns inter-channel skew and stable 50 Ω source termination, eliminating external resistors and layout sensitivity. | Use Scenario: Adding 8-bit programmable I/O ports to an 8051-based medical device controller with limited native GPIO. IC Role / Device Role / Timing Role: Memory-mapped output latch - mapped to dedicated address space and written via MOVX instruction; OE tied low for permanent enable. Use Value: Provides TTL/CMOS-compatible drive strength and noise margin while maintaining full compatibility with legacy 74LS374-based PCB layouts. |
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 |
|---|---|---|---|
| SN74AC374N | DIP-20 package; higher ICC (10 µA typ.); identical AC specs and pinout | Through-hole prototyping or legacy board repair where TSSOP rework is impractical | Select for manual soldering or socket-based validation; avoid in high-density or thermally constrained layouts |
| 74LVC374APW | 3.3V-only operation (1.65V–3.6V); lower VCC max; 24 mA drive retained; -40°C to +125°C rating | Modern low-voltage embedded systems requiring tighter power budget and smaller footprint | Choose when system VCC is fixed at 3.3V and extended temperature range is required; not suitable for 5V mixed-signal interfaces |
Compared with SN74AC374N and 74LVC374APW, the 74AC374MTR uniquely balances wide voltage operation (2V–6V), TSSOP-20 compactness, and 270 MHz speed-making it optimal for retrofitting legacy 5V designs with surface-mount constraints and noise-sensitive industrial environments.
Availability
74AC374MTR is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive body control modules, test equipment pattern generation, and legacy embedded I/O expansion requiring stable component supply and long-term manufacturability.
Supply support for 74AC374MTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing capabilities.
The 74AC series targets high-speed, low-power logic applications demanding robust noise immunity and mixed-voltage interoperability-designed specifically for industrial control, instrumentation, and legacy-system modernization.
FAQ
What is the minimum clock pulse width required for reliable operation?
The minimum HIGH and LOW clock pulse width is 4.0 ns at VCC = 5.0 V across the full operating temperature range (–55°C to +125°C). This specification ensures setup and hold time margins are maintained even under worst-case process, voltage, and temperature conditions, preventing metastability or missed clock edges.
Can OE be toggled asynchronously while the clock is running?
Yes-OE operates independently of the clock and can be asserted or deasserted at any time without affecting internal flip-flop state. Data remains latched and can be updated on subsequent CK edges even while outputs are in high-impedance, enabling dynamic bus arbitration without data loss.
Does the 74AC374MTR support hot-plug operation on live buses?
No-while the device has 2 kV HBM ESD protection and improved latch-up immunity, it lacks explicit hot-swap circuitry (e.g., power sequencing, slew-rate control, or undervoltage lockout). Connecting or disconnecting while powered risks transient overstress on VCC, GND, or I/O pins unless external protection is implemented.
What is the maximum capacitive load the outputs can drive while maintaining specified timing?
The AC specifications (propagation delay, enable/disable times) are characterized with CL = 50 pF and RL = 500 Ω. Driving heavier loads increases delay and may degrade edge fidelity; for >50 pF, derating curves in the datasheet must be applied, and transmission-line driving (50 Ω) remains valid only when terminated properly at the far end.
74AC374MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 270 MHz
- Max Propagation Delay @ V, Max CL:
- 9.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74AC374MTR FAQ
1.How can I place an order for 74AC374MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC374MTR 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 74AC374MTR reliable?
The price and inventory of 74AC374MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC374MTR is usually 5 days.
3.What payment methods are accepted for 74AC374MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC374MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC374MTR?
74AC374MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC374MTR 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 74AC374MTR?
For technical support, including 74AC374MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC374MTR requirements.
6.How does Aetrix verify that 74AC374MTR is sourced from the original manufacturer or authorized distributors?
All 74AC374MTR 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 74AC374MTR meets industry standards.
7.What is the process for return or replacement of 74AC374MTR?
All 74AC374MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC374MTR, 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 74AC374MTR part is unused and in its original packaging.
Return procedure for 74AC374MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74AC374MTR 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 and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
