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STMicroelectronics M74HCT374B1R
- Part No.:
- M74HCT374B1R
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
M74HCT374B1R.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,610
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Product details
Overview
M74HCT374B1R from STMicroelectronics is a high-speed CMOS octal D-type flip-flop with non-inverting 3-state outputs, designed for TTL-compatible bus interface and data latching in synchronous digital systems. It operates at up to 50 MHz (typ.) at VCC = 4.5 V, features balanced propagation delays (tPLH ≅ tPHL), symmetrical output drive (|IOH| = IOL = 6 mA min), and supports industrial temperature range (–55 °C to +125 °C).
For engineers reviewing the M74HCT374B1R datasheet, M74HCT374B1R pinout, M74HCT374B1R application, or M74HCT374B1R equivalent, key selection criteria include 3-state output enable timing (tPZL/tPLZ ≤ 42 ns), input compatibility with TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V), quiescent current (ICC ≤ 4 µA), and DIP-20 package suitability for through-hole prototyping and legacy board designs.
Technical Context
The M74HCT374B1R implements eight edge-triggered D-type latches synchronized to the rising edge of the CK input, with independent 3-state control via active-low OE. Its C2MOS silicon gate process ensures low static power consumption while maintaining TTL-level input thresholds and rail-to-rail output swing.
Internal operation remains fully functional during output disable - data can be latched on clock edges regardless of OE state - enabling transparent pipeline staging and bus arbitration without disrupting register integrity. All inputs include integrated ESD and transient voltage protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| fMAX | 50 MHz (typ.) at VCC = 4.5 V - defines maximum synchronous data throughput for latch-to-latch transfer |
| tPLH / tPHL | 20–45 ns (VCC = 4.5 V, CL = 50 pF) - ensures predictable, matched rise/fall path timing for setup/hold margining |
| IOL / IOH | 6 mA (min) - guarantees robust drive into standard TTL loads without external buffering |
| VIH / VIL | 2.0 V (min) / 0.8 V (max) - enables direct interfacing with legacy TTL outputs without level-shifting |
| ICC | 4 µA (max) at TA = 25 °C - supports ultra-low standby power in battery-backed or energy-sensitive systems |
| Operating Temp | –55 °C to +125 °C - qualified for automotive under-hood, industrial control, and aerospace environments |
| Package | DIP-20 (0.300" wide) - compatible with manual soldering, socket-based test fixtures, and legacy PCB layouts |
Pinout & Package
Package: Plastic Dual In-line Package (DIP-20), 0.300" body width, through-hole mounting. Pin pitch: 2.54 mm (0.100").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low 3-state output enable - disables all Q outputs to high impedance independently of clock or data |
| 2,5,6,9,12,15,16,19 | Q0–Q7 | Non-inverting latched outputs - reflect D-input states sampled on prior CK rising edge when OE = L |
| 3,4,7,8,13,14,17,18 | D0–D7 | Data inputs - sampled synchronously on CK rising edge; unaffected by OE state |
| 11 | CK | Clock input - rising-edge triggered; controls sampling of D inputs into internal latches |
| 10 | GND | Ground reference (0 V) - return path for all input/output currents and internal logic |
| 20 | VCC | Positive supply (4.5–5.5 V) - powers internal logic and output drivers; decoupling required near pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH ≥ 2.0 V and VIL ≤ 0.8 V - eliminates need for external level shifters when driving from 74LS/74F sources |
| 3-state output control | OE pin enables bus sharing across multiple devices without contention or external tri-state logic |
| Edge-triggered latching | Rising-edge CK synchronization ensures deterministic sampling and avoids metastability in synchronous designs |
| Low quiescent current | ICC ≤ 4 µA - reduces system-level standby power and thermal load in always-on subsystems |
| Wide temperature range | –55 °C to +125 °C operation - supports deployment in uncontrolled ambient environments without derating |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
Use Scenario: Adding parallel digital I/O capability to programmable logic controllers using ISA or STD bus backplanes. IC Role / Device Role / Timing Role: Data latching and bus isolation element - holds sensor/actuator states between scan cycles and gates data onto shared address/data lines. Use Value: Enables reliable handshaking with microcontroller peripherals via OE-controlled tristate outputs and TTL-level compatibility with older bus drivers. | Use Scenario: Bridging modern microcontrollers to vintage instrumentation with 5 V TTL parallel interfaces (e.g., GPIB auxiliary buses, printer ports). IC Role / Device Role / Timing Role: Synchronous data capture and bus driver - samples external device status on CK edge and presents it to MCU via 3-state outputs. Use Value: Eliminates timing uncertainty from asynchronous reads by providing edge-aligned, noise-immune data capture with controlled bus release. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
Use Scenario: Latching door lock, window, and lighting control signals in vehicle body electronics modules operating under wide ambient temperature swings. IC Role / Device Role / Timing Role: Output register stage - stores MCU command bits and drives relays/LEDs via buffered, short-circuit protected outputs. Use Value: Delivers guaranteed 6 mA drive strength across –40 °C to +105 °C, supporting direct LED/relay interface without external transistors. | Use Scenario: Generating repeatable, synchronized digital stimulus waveforms for IC functional testing using FPGA or microcontroller-based pattern generators. IC Role / Device Role / Timing Role: Output staging register - holds pattern words and releases them onto test bus only when enabled, minimizing signal skew. Use Value: Provides sub-45 ns propagation delay matching and <1 ns skew between outputs, critical for high-speed vector timing accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT374N | Same logic function, identical AC/DC specs, but TI's DIP-20 has slightly higher max ICC (8 µA vs. 4 µA) | No functional difference in bus interface or latching; minor power advantage for long-idle systems | Preferred where TI supply chain preference or dual-sourcing is required |
| 74HCT374PC | Identical pinout and timing, but NXP version specifies wider VCC tolerance (4.5–5.5 V same) and tighter tPLH/tPHL matching (±1 ns) | Better suited for high-reliability timing-critical paths where inter-output skew must be minimized | Select when sub-nanosecond skew control is required across all eight outputs |
Compared with SN74HCT374N and 74HCT374PC, the M74HCT374B1R offers the lowest quiescent current (4 µA max) and full industrial temperature qualification (–55 °C to +125 °C), making it optimal for low-power, extended-range embedded control where thermal stability and standby efficiency are prioritized over marginal skew reduction.
Availability
M74HCT374B1R is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, legacy bus interface adapters, and test equipment digital pattern generators requiring stable component supply and long-term obsolescence management.
Supply support for M74HCT374B1R 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 ICs with vertical manufacturing and broad analog/mixed-signal portfolio.
The M74HCT374B1R belongs to ST's legacy HCT logic family, engineered for seamless interoperability between CMOS logic and existing TTL-based systems while delivering improved noise immunity and reduced power versus standard HC variants.
FAQ
What is the maximum clock frequency supported by the M74HCT374B1R?
The M74HCT374B1R supports a maximum clock frequency of 50 MHz (typical) at VCC = 4.5 V with CL = 50 pF. At worst-case conditions (–55 °C to +125 °C, VCC = 4.5 V), fMAX drops to 21 MHz. This rating assumes clean, monotonic clock edges with rise/fall times ≤ 6 ns and proper PCB layout with local decoupling.
Can the M74HCT374B1R drive standard TTL loads directly?
Yes - the M74HCT374B1R provides minimum output drive of 6 mA for both IOH and IOL, meeting or exceeding standard TTL fan-out requirements (TTL LS: 400 µA sink, 15 mA source). Its VIH/VIL thresholds (2.0 V / 0.8 V) ensure reliable recognition of TTL output logic levels without level translation.
Does the OE pin affect internal latch operation?
No - the OE pin controls only the output buffer stage. Internal latches continue to sample D inputs on every CK rising edge and retain stored data regardless of OE state. This allows continuous data capture and storage even while outputs are disabled, supporting pipelined bus architectures.
Is the M74HCT374B1R still in active production?
While STMicroelectronics lists M74HCT374 variants as "obsolete" in newer marketing documents, the M74HCT374B1R (DIP-20 packaging) remains actively stocked and supported by authorized distributors with verified inventory and full traceability. Aetrix Electronics maintains dedicated lifecycle management for this part due to sustained demand in industrial retrofits and maintenance programs.
M74HCT374B1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HCT
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- 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:
- 50 MHz
- Max Propagation Delay @ V, Max CL:
- 38ns @ 4.5V, 150pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-DIP
M74HCT374B1R FAQ
1.How can I place an order for M74HCT374B1R through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HCT374B1R 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 M74HCT374B1R reliable?
The price and inventory of M74HCT374B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HCT374B1R is usually 5 days.
3.What payment methods are accepted for M74HCT374B1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HCT374B1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HCT374B1R?
M74HCT374B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HCT374B1R 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 M74HCT374B1R?
For technical support, including M74HCT374B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HCT374B1R requirements.
6.How does Aetrix verify that M74HCT374B1R is sourced from the original manufacturer or authorized distributors?
All M74HCT374B1R 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 M74HCT374B1R meets industry standards.
7.What is the process for return or replacement of M74HCT374B1R?
All M74HCT374B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HCT374B1R, 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 M74HCT374B1R part is unused and in its original packaging.
Return procedure for M74HCT374B1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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