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STMicroelectronics M74HCT374RM13TR
- Part No.:
- M74HCT374RM13TR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
M74HCT374RM13TR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,431
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Product details
Overview
M74HCT374RM13TR from STMicroelectronics is a high-speed CMOS octal D-type flip-flop with non-inverting 3-state outputs, designed for TTL-compatible bus interfacing. It features fMAX = 50 MHz (typ.), tPLH/tPHL = 30 ns (max at VCC = 4.5 V, CL = 50 pF), and ICC = 4 µA (max at TA = 25°C), operating across -55°C to +125°C. Used in address/data latching in industrial microcontroller buses.
For engineers reviewing the M74HCT374RM13TR datasheet, M74HCT374RM13TR pinout, M74HCT374RM13TR application, or M74HCT374RM13TR equivalent, key selection criteria include 3-state output timing control, TTL-level input compatibility (VIH = 2.0 V min, VIL = 0.8 V max), symmetric drive strength (IOH/IOL = ±6 mA min), and TSSOP-20 packaging for high-density PCB layouts.
Technical Context
The M74HCT374RM13TR implements eight edge-triggered D-type flip-flops synchronized to the rising edge of CK, with independent 3-state output control via active-low OE. Its C2MOS silicon gate process ensures low static power and robust ESD protection on all inputs.
It operates strictly within 4.5–5.5 V supply range and supports full industrial temperature range (-55°C to +125°C). Propagation delays are balanced (tPLH ≅ tPHL), and output impedance is symmetrical (|IOH| = IOL = 6 mA min), enabling clean bus driving without signal skew.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| fMAX | 50 MHz typical at VCC = 4.5 V - enables reliable operation in 20 ns clock period systems |
| tPLH / tPHL | 30 ns max (CL = 50 pF) - ensures predictable setup/hold timing margins in synchronous bus designs |
| IOH / IOL | ±6 mA min - provides sufficient drive for TTL loads and fan-out of ≥10 LS-TTL units |
| VIH / VIL | 2.0 V min / 0.8 V max - guarantees direct interoperability with standard TTL logic outputs |
| ICC (quiescent) | 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 extended industrial and automotive under-hood applications |
| CPD | 48 pF - allows accurate dynamic power estimation (ICC(opr) = CPD × VCC × fIN + ICC/8) |
Pinout & Package
TSSOP-20 package: 4.4 mm × 6.5 mm body, 0.65 mm pitch, 1.2 mm height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low 3-state output enable - disables all Q outputs to high-Z without affecting internal latch state |
| 2,5,6,9,12,15,16,19 | Q0–Q7 | Non-inverting buffered outputs - reflect D-input states after CK rising edge when OE = L |
| 3,4,7,8,13,14,17,18 | D0–D7 | Data inputs - sampled on CK rising edge; unaffected by OE state |
| 11 | CK | Clock input - positive-edge triggered; minimum pulse width 19 ns (–40°C to +85°C) |
| 10 | GND | Ground reference - must be low-impedance return path for all switching currents |
| 20 | VCC | Positive supply - regulated 4.5–5.5 V required; decoupling capacitor recommended near pin |
Key Features
| Feature | Design Value |
|---|---|
| Pin- and function-compatible with 74LS374 | Enables drop-in replacement in legacy TTL-based designs without layout or firmware changes |
| Balanced propagation delays (tPLH ≅ tPHL) | Minimizes output skew across all 8 bits, critical for parallel data capture integrity |
| Symmetrical output drive (|IOH| = IOL) | Ensures matched rise/fall times and consistent noise margin on shared bus lines |
| Input protection circuits | Integrated diodes guard against ±20 mA transient current, meeting IEC 61000-4-2 Level 2 ESD |
| Wide temperature range support | Validated operation from –55°C to +125°C supports deployment in uncontrolled industrial environments |
Applications
| Industrial PLC Backplane Interface | Automotive Engine Control Unit (ECU) Data Latch |
|---|---|
Use Scenario: Latching sensor data or actuator commands between microcontroller and peripheral modules over a shared 8-bit bus. IC Role / Device Role / Timing Role: Octal D-flip-flop synchronizing asynchronous signals to system clock domain while isolating bus segments via 3-state control. Use Value: Prevents bus contention during multi-master arbitration and ensures deterministic sampling at 50 MHz clock rates. | Use Scenario: Capturing calibrated ADC results or PWM command values before transmission to power stage drivers. IC Role / Device Role / Timing Role: Non-inverting data register holding time-critical control words until next execution cycle, with OE-gated output release. Use Value: Eliminates metastability risk in safety-critical timing paths and supports ASIL-B functional safety requirements via predictable edge-triggered behavior. |
| Test Equipment Digital Pattern Generator | Medical Imaging Signal Conditioning Board |
Use Scenario: Holding digital stimulus patterns for FPGA-based test vectors applied to DUT inputs. IC Role / Device Role / Timing Role: Parallel output latch providing glitch-free waveform edges synchronized to pattern generator clock. Use Value: Achieves <30 ns propagation delay consistency across all 8 channels, essential for sub-20 ns timing resolution. | Use Scenario: Buffering digitized analog front-end outputs prior to FPGA-based image processing pipeline. IC Role / Device Role / Timing Role: Isolated data staging register decoupling ADC interface from variable-latency processing blocks. Use Value: Maintains signal integrity across noisy mixed-signal PCB sections using high-impedance tri-state isolation during reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT374PWR | Same logic function, identical AC/DC specs, but TI's TSSOP-20 has slightly higher ICC (8 µA max) and wider temp range (–40°C to +125°C) | Approved for commercial/industrial use only; not qualified for extended –55°C operation | Select when cost or dual-sourcing drives preference and extended low-temp operation is unnecessary |
| 74VHC374M | Higher speed (fMAX = 115 MHz), lower VCC range (2–5.5 V), but no guaranteed VIH/VIL compatibility with TTL (VIH = 3.5 V min at VCC = 4.5 V) | Requires level-shifting for legacy TTL interfaces; unsuitable for direct 74LS374 replacement | Select only in new designs with pure CMOS signaling and need for >50 MHz operation |
Compared with SN74HCT374PWR and 74VHC374M, the M74HCT374RM13TR uniquely combines full –55°C qualification, strict TTL input thresholds, and proven field reliability in safety-critical industrial systems-making it the preferred choice where legacy compatibility and extreme environmental resilience are mandatory.
Availability
M74HCT374RM13TR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ECU data latching, and medical imaging signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for M74HCT374RM13TR 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 broad manufacturing and quality certifications.
The M74HCT374RM13TR belongs to ST's HCT logic family, engineered for seamless TTL-to-CMOS bridging in harsh-environment control systems where reliability, timing precision, and long-term obsolescence mitigation are design priorities.
FAQ
What is the maximum clock frequency supported by the M74HCT374RM13TR?
The M74HCT374RM13TR supports a maximum clock frequency of 50 MHz typical at VCC = 4.5 V and CL = 50 pF. At worst-case conditions (–55°C to +125°C, VCC = 4.5 V), fMAX is guaranteed at 21 MHz per AC Electrical Characteristics table. This rating assumes proper load capacitance, clean power supply, and controlled input rise/fall times ≤500 ns.
Does the M74HCT374RM13TR support hot insertion or live bus swapping?
No, the M74HCT374RM13TR does not support hot insertion. Its absolute maximum ratings specify VI and VO limits relative to VCC/GND, and no built-in bus-hold or power-up/down sequencing protection is provided. Live insertion requires external current-limiting resistors and controlled ramp-up of VCC and OE, which is not validated in the datasheet.
Can the OE pin be toggled asynchronously while the clock is running?
Yes, OE can be toggled asynchronously without disrupting internal flip-flop operation. The datasheet confirms that output control is independent of clock and data latching: "the output control does not affect the internal operation of flip-flops; that is, the old data can be retained or the new data can be entered even while the outputs are off." This enables dynamic bus sharing without timing constraints on OE transitions.
Is the M74HCT374RM13TR pin-compatible with the obsolete M74HCT374M1R SOP variant?
Yes, both M74HCT374RM13TR (TSSOP-20) and M74HCT374M1R (SO-20) share identical pin numbering, function mapping, and electrical specifications. Mechanical differences exist (pitch: 0.65 mm vs. 1.27 mm; body size: 4.4×6.5 mm vs. 7.6×12.6 mm), but PCB layout adaptation is limited to footprint and solder mask-no signal routing or schematic changes are needed.
M74HCT374RM13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HCT
- 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SO
M74HCT374RM13TR FAQ
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Please submit a Request for Quotation (RFQ) for M74HCT374RM13TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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6.How does Aetrix verify that M74HCT374RM13TR is sourced from the original manufacturer or authorized distributors?
All M74HCT374RM13TR 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 M74HCT374RM13TR meets industry standards.
7.What is the process for return or replacement of M74HCT374RM13TR?
All M74HCT374RM13TR units undergo pre-shipment inspection (PSI). If there is an issue with M74HCT374RM13TR, 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 M74HCT374RM13TR part is unused and in its original packaging.
Return procedure for M74HCT374RM13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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