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STMicroelectronics 74ACT273MTR
- Part No.:
- 74ACT273MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ACT273MTR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,510
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Product details
Overview
74ACT273MTR from STMicroelectronics is an advanced high-speed CMOS octal D-type flip-flop with asynchronous clear, designed for clock-synchronized data latching in digital control and interface circuits. It operates from 4.5V to 5.5V, delivers 24mA output drive, features 190MHz max clock frequency (typ.), and supports TTL-compatible input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V) for mixed-logic system interfacing.
For engineers reviewing the 74ACT273MTR datasheet, 74ACT273MTR pinout, 74ACT273MTR application, or 74ACT273MTR equivalent, key selection criteria include propagation delay symmetry (tPLH ≅ tPHL), 50Ω transmission line driving capability, latch-up immunity, ESD robustness (2kV), and pin/function compatibility with legacy 74-series 273 devices.
Technical Context
The 74ACT273 implements eight edge-triggered D flip-flops sharing a common clock and asynchronous active-low clear. Each stage transfers D-input data to Q-output on the low-to-high clock transition, with independent D/Q paths and no internal feedback or preset functionality.
Its sub-micron C2MOS process enables symmetrical output impedance (|IOH| = IOL ≥ 24mA), balanced propagation delays (tPLH/tPHL ≤ 9.0ns at 5V), and ultra-low quiescent current (ICC ≤ 4µA at 25°C), making it suitable for noise-sensitive, power-constrained synchronous logic interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 4.5V to 5.5V - Ensures stable operation across industrial-grade 5V supply tolerances. |
| fMAX (Typ.) | 190MHz - Supports high-throughput data capture in fast control loops and bus interfaces. |
| tPLH / tPHL (Max) | 9.0ns - Guarantees predictable, matched timing for setup/hold-critical synchronous systems. |
| IOL / IOH (Min) | 24mA - Drives 50Ω transmission lines directly without external buffers. |
| ICC (Max @ 25°C) | 4µA - Enables low-static-power operation in always-on logic subsystems. |
| ESD Immunity | 2kV HBM - Provides robust handling during board assembly and field service. |
| VIH / VIL Thresholds | 2.0V / 0.8V - Ensures reliable interfacing with TTL, NMOS, and CMOS outputs. |
Pinout & Package
TSSOP-20 package: 6.4mm × 6.5mm body, 0.65mm pitch, thin-profile surface-mount construction optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLEAR | Asynchronous active-low master reset - forces all Q outputs low regardless of clock or D inputs. |
| 2,5,6,9,12,15,16,19 | Q0–Q7 | Registered data outputs - reflect latched D-input states after positive clock edge. |
| 3,4,7,8,13,14,17,18 | D0–D7 | Data inputs - sampled synchronously on rising clock edge; unaffected by CLEAR until next clock. |
| 11 | CLOCK | Edge-triggered input - initiates latching only on low-to-high transitions. |
| 10 | GND | Reference ground - return path for all input/output currents and internal logic. |
| 20 | VCC | Positive supply - powers internal logic and output drivers; requires local decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Pin- and function-compatible with 74LS273/74HC273 | Enables drop-in replacement in legacy designs without layout or firmware changes. |
| Symmetrical output drive (24mA sink/source) | Eliminates need for external level-shifting or buffering when driving 50Ω lines. |
| Balanced tPLH/tPHL propagation delays | Reduces clock skew sensitivity and simplifies timing margin analysis. |
| Improved latch-up immunity | Prevents destructive parasitic SCR activation under transient overvoltage conditions. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Latching sensor status or actuator commands from microcontroller GPIO ports into isolated output stages. IC Role / Device Role / Timing Role: Synchronous data register providing glitch-free parallel output staging synchronized to system clock. Use Value: Ensures deterministic update timing across all 8 channels, preventing partial-state transitions during MCU interrupt servicing. | Use Scenario: Capturing door lock/unlock, window position, or lighting control signals from CAN/LIN gateway MCUs. IC Role / Device Role / Timing Role: Edge-triggered D flip-flop array holding command state between gateway polling intervals. Use Value: Maintains stable output during MCU sleep modes via asynchronous CLEAR override, reducing system wake-up latency. |
| Test Equipment Digital Pattern Generators | Communications Backplane Interface Logic |
Use Scenario: Generating precise, multi-bit stimulus patterns synchronized to high-frequency test clocks. IC Role / Device Role / Timing Role: High-speed data latch enabling deterministic pattern edge alignment at >100MHz rates. Use Value: Use Value: 190MHz fMAX and 9ns max propagation delay support sub-5ns timing resolution in ATE applications. | Use Scenario: Interfacing FPGA-based packet processors with legacy parallel bus peripherals (e.g., memory-mapped registers). IC Role / Device Role / Timing Role: Level-shifting and timing synchronization bridge between 3.3V/5V domains with TTL-compatible thresholds. Use Value: 24mA drive strength and 2kV ESD rating ensure reliable signal integrity across noisy backplane environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with clear applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT273PW | TSSOP-20 package, identical AC/DC specs, TI-branded; same pinout and timing. | No functional difference; validated for identical use cases including industrial control and test equipment. | Select when dual-sourcing from TI is required or when TI's qualification documentation is mandated. |
| 74VHC273FT | Lower drive (8mA), higher fMAX (180MHz), 2.0–5.5V VCC range; different input thresholds (VIH=3.5V min). | Not suitable for direct TTL interfacing; requires level translation in mixed-voltage systems. | Choose only for 3.3V-native designs where lower power and wider voltage range outweigh drive capability loss. |
Compared with SN74ACT273PW, the 74ACT273MTR offers identical performance but differs in manufacturer qualification and traceability; versus 74VHC273FT, it provides superior drive strength and TTL compatibility at the cost of narrower VCC range and higher static current.
Availability
74ACT273MTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and test equipment digital pattern generators requiring stable component supply and long-term obsolescence management.
Supply support for 74ACT273MTR 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 specializing in automotive, industrial, and power management ICs, with broad analog, digital, and mixed-signal product portfolios.
The 74ACT series targets high-speed, low-power logic interfacing in industrial and automotive applications, emphasizing robustness, timing precision, and mixed-technology compatibility.
FAQ
Is the 74ACT273MTR compatible with 5V TTL logic families?
Yes - it features TTL-compatible input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V at VCC = 4.5–5.5V) and 24mA output drive, enabling direct connection to 74LS, 74F, and other 5V TTL outputs without level shifters or pull-ups.
What is the minimum pulse width required on the CLEAR input?
The minimum CLEAR pulse width is 4.0ns over the full operating temperature range (–55°C to +125°C) at VCC = 5.0V, ensuring reliable asynchronous reset even in high-speed timing environments.
Does the 74ACT273MTR support hot insertion or live insertion?
No - it lacks explicit hot-swap protection circuitry. While its 2kV HBM ESD rating improves handling robustness, the device must be powered and stabilized before signal application; unpowered insertion risks latch-up or damage.
Can the 74ACT273MTR operate at 3.3V supply?
No - its specified operating VCC range is strictly 4.5V to 5.5V. At 3.3V, input thresholds become non-compliant, output drive collapses, and AC timing parameters are not guaranteed; use 74VHC273 or 74LVC273 for 3.3V operation.
74ACT273MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 190 MHz
- Max Propagation Delay @ V, Max CL:
- 8.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- 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
74ACT273MTR FAQ
1.How can I place an order for 74ACT273MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT273MTR 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 74ACT273MTR reliable?
The price and inventory of 74ACT273MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT273MTR is usually 5 days.
3.What payment methods are accepted for 74ACT273MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT273MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT273MTR?
74ACT273MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT273MTR 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 74ACT273MTR?
For technical support, including 74ACT273MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT273MTR requirements.
6.How does Aetrix verify that 74ACT273MTR is sourced from the original manufacturer or authorized distributors?
All 74ACT273MTR 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 74ACT273MTR meets industry standards.
7.What is the process for return or replacement of 74ACT273MTR?
All 74ACT273MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT273MTR, 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 74ACT273MTR part is unused and in its original packaging.
Return procedure for 74ACT273MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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