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STMicroelectronics M74HC174B1R
- Part No.:
- M74HC174B1R
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
M74HC174B1R.pdf
- Description:
- IC FF D-TYPE SNGL 6BIT 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,358
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Product details
Overview
M74HC174B1R from STMicroelectronics is a high-speed CMOS hex D-type flip-flop with asynchronous clear, operating across 2V–6V supply, delivering 66MHz max clock frequency (typ.) at 6V, 23ns propagation delay (tPHL, VCC=6V), and 4µA quiescent current (max, TA=25°C), used in synchronous logic control and data latching in industrial timing circuits.
For engineers reviewing the M74HC174B1R datasheet, M74HC174B1R pinout, M74HC174B1R application, or M74HC174B1R equivalent, key selection criteria include asynchronous clear behavior, edge-triggered clock response, symmetrical output drive (±4mA), noise immunity (28% VCC), and DIP-16 package compatibility with legacy 74-series layouts.
Technical Context
The M74HC174B1R implements six independent positive-edge-triggered D flip-flops with a shared active-low asynchronous CLEAR input that forces all Q outputs low regardless of clock or data state. Each stage features silicon gate C2MOS technology for low static power and high noise margin.
It operates over an extended temperature range (−55°C to +125°C) and supports mixed-voltage interfacing via 2V–6V VCC, with input thresholds referenced to VCC (VIH = 0.7×VCC min, VIL = 0.3×VCC max) and rail-to-rail output swing under light load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - Enables direct interface with 3.3V and 5V logic domains without level shifters. |
| Max Clock Frequency | 66MHz (typ. at VCC=6V) - Supports high-speed data capture in control-state machines and pipeline registers. |
| Propagation Delay (CLK→Q) | 23ns (max at VCC=6V, TA=125°C) - Ensures timing predictability in synchronous counter and register applications. |
| Output Drive Strength | ±4mA (min) - Sufficient to drive multiple 74HC inputs or small capacitive loads (<50pF) without buffering. |
| Quiescent Supply Current | 4µA (max at TA=25°C) - Enables use in battery-backed or always-on monitoring logic with negligible standby drain. |
| Noise Immunity | VNIH/VNIL = 28% VCC (min) - Provides robust operation in electrically noisy industrial environments. |
| Operating Temperature | −55°C to +125°C - Qualified for under-hood automotive, motor control, and industrial PLC modules. |
Pinout & Package
Package: Plastic DIP-16 (0.300" width), JEDEC MS-001, body dimensions 20.0 × 8.5 × 3.3 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLEAR | Asynchronous active-low reset - overrides clock and data to force all Q outputs low immediately. |
| 2,5,7,10,12,15 | Q0–Q5 | True outputs of six D flip-flops - retain state until next positive clock edge or CLEAR assertion. |
| 3,4,6,11,13,14 | D0–D5 | Data inputs - sampled on rising clock edge and transferred to corresponding Q outputs. |
| 9 | CLOCK | Positive-edge-triggered global clock - synchronizes all six flip-flops simultaneously. |
| 8 | GND | Ground reference - must be low-impedance return path for all switching currents. |
| 16 | VCC | Positive supply - powers internal logic and output drivers; bypassing with 100nF ceramic near pin is recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Pin & function compatibility | Fully compatible with industry-standard 74LS174 and 74HC174 pinouts and truth table - enables drop-in replacement in existing designs. |
| Asynchronous master clear | Single-pin global reset independent of clock phase - critical for system initialization and fault recovery. |
| Symmetrical output impedance | |IOH| = IOL = 4mA (min) - ensures matched rise/fall times and reduces signal skew in parallel bus interfaces. |
| Wide voltage operation | 2V–6V supply range - supports mixed-supply systems and brown-out tolerant operation down to 2V. |
| High noise immunity | VNIH/VNIL ≥ 28% VCC - rejects EFT bursts and conducted noise common in motor drives and relay-switched environments. |
Applications
| Industrial PLC Register Bank | Legacy System Data Latch |
|---|---|
Use Scenario: Holding sensor status bits across scan cycles in programmable logic controllers with discrete I/O modules. IC Role / Device Role / Timing Role: Hex D-type latch providing synchronized, glitch-free storage of 6-bit parallel input from opto-isolated field terminals. Use Value: Asynchronous CLEAR allows full register reset during controller warm start; 66MHz capability supports fast scan rates up to 10kHz. | Use Scenario: Capturing address/data bus states in retro-computing or instrumentation systems using 74-series TTL-compatible logic. IC Role / Device Role / Timing Role: Edge-triggered data register replacing obsolete 74LS174 in backplane-mounted control cards. Use Value: Pin-for-pin compatibility and identical truth table enable direct substitution; 4µA ICC reduces board-level standby power by >95% vs. LS family. |
| Motor Control State Sequencer | Test Equipment Pattern Generator |
Use Scenario: Encoding commutation states for 3-phase BLDC motor drivers using Hall-effect feedback. IC Role / Device Role / Timing Role: Six-bit state register synchronized to PWM timer clock edges to generate gated gate-drive signals. Use Value: Balanced tPLH/tPHL ensures precise timing alignment between phase outputs; −55°C to +125°C rating supports under-hood deployment. | Use Scenario: Generating deterministic stimulus patterns for IC functional testing in ATE fixtures. IC Role / Device Role / Timing Role: Synchronized pattern store holding 6-bit test vectors clocked from system master oscillator. Use Value: Low 23ns propagation delay enables sub-40ns pattern update resolution; 50pF load AC specs validated per JEDEC JESD-8A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex D-type flip-flop with clear applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC174N | Same logic function and pinout; higher ICC (8µA max) and slightly slower fMAX (54MHz typ. at 6V). | Qualified to TI's commercial temp range only (−40°C to +85°C); not rated for extended industrial or automotive use. | Select when cost sensitivity outweighs extended temperature or ultra-low ICC requirements. |
| 74VHC174N | Higher speed (fMAX = 115MHz typ.), lower CPD (25pF), but tighter VIH/VIL thresholds (70%/30% VCC) reduce noise margin. | More susceptible to supply ripple and crosstalk; requires cleaner layout and tighter decoupling than M74HC174B1R. | Select only when >80MHz operation is mandatory and noise environment is tightly controlled. |
Compared with SN74HC174N and 74VHC174N, the M74HC174B1R offers superior wide-temperature reliability, lowest quiescent current, and highest noise immunity - making it optimal for safety-critical or energy-constrained industrial control nodes.
Availability
M74HC174B1R is available at Aetrix Electronics and suitable for industrial PLC register banks, motor control sequencers, legacy system data latches, and test equipment pattern generators requiring stable component supply across long production lifecycles.
Supply support for M74HC174B1R 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, designing and manufacturing microcontrollers, analog ICs, power management devices, and discrete components for industrial, automotive, and consumer markets.
The M74HC174B1R belongs to ST's high-speed HC logic family, engineered for pin-compatible upgrades of legacy 74LS designs while delivering lower power, wider voltage range, and extended temperature resilience.
FAQ
Is M74HC174B1R compatible with 5V TTL logic inputs?
Yes - its input thresholds (VIH ≥ 3.15V, VIL ≤ 1.35V at VCC = 4.5V) meet TTL voltage levels, and it tolerates input voltages up to VCC + 0.5V. No external level-shifting is required when driven by standard 5V TTL outputs.
What is the minimum pulse width required on the CLEAR pin?
The minimum CLEAR pulse width is 5ns (guaranteed across −55°C to +125°C at VCC = 6V). This ensures reliable asynchronous reset even in high-speed state machine recovery sequences where RESET pulses may be narrow.
Does M74HC174B1R require external pull-up resistors on unused inputs?
No - all inputs include integrated protection diodes and have no internal pull-ups. However, floating inputs must be tied to VCC or GND to prevent increased ICC and potential oscillation; unused D inputs should be grounded or connected to valid logic levels.
Can M74HC174B1R operate reliably at 2.0V supply?
Yes - it is fully specified down to 2.0V, with fMAX = 7.2MHz (min), tPHL = 205ns (max), and VIH = 1.5V (min). It maintains functionality in ultra-low-power battery-operated systems, though propagation delay increases significantly versus 6V operation.
M74HC174B1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 66 MHz
- Max Propagation Delay @ V, Max CL:
- 23ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- 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:
- 16-DIP
M74HC174B1R FAQ
1.How can I place an order for M74HC174B1R through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC174B1R 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 M74HC174B1R reliable?
The price and inventory of M74HC174B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC174B1R is usually 5 days.
3.What payment methods are accepted for M74HC174B1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC174B1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC174B1R?
M74HC174B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC174B1R 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 M74HC174B1R?
For technical support, including M74HC174B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC174B1R requirements.
6.How does Aetrix verify that M74HC174B1R is sourced from the original manufacturer or authorized distributors?
All M74HC174B1R 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 M74HC174B1R meets industry standards.
7.What is the process for return or replacement of M74HC174B1R?
All M74HC174B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC174B1R, 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 M74HC174B1R part is unused and in its original packaging.
Return procedure for M74HC174B1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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