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STMicroelectronics 74AC273MTR
- Part No.:
- 74AC273MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74AC273MTR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,076
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Product details
Overview
74AC273MTR 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 2V to 6V, delivers 24mA output drive, features 250MHz max clock frequency (at 5V), and provides symmetrical tPLH/tPHL propagation delays. Used in bus interface logic, address latching, and state register applications.
For engineers reviewing the 74AC273MTR datasheet, 74AC273MTR pinout, 74AC273MTR application, or 74AC273MTR equivalent, key selection criteria include its 20-pin SOIC-Tape & Reel packaging, 24mA sink/source capability, 50Ω transmission line driving, -55°C to +125°C operating range, and compatibility with standard 74-series 273 logic functions.
Technical Context
The device implements eight edge-triggered D-type flip-flops sharing a common clock and asynchronous active-low clear. Each flip-flop transfers D-input data to Q-output on the LOW-to-HIGH clock transition, independent of other inputs when CLEAR is asserted.
It uses sub-micron silicon gate C2MOS technology with double-layer metal wiring, enabling low ICC (8µA max at 25°C), high noise immunity (28% VCC min), and latch-up immunity. Input/output protection ensures 2kV ESD tolerance and transient voltage resilience.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2V to 6V - supports mixed-voltage system interfacing and legacy 5V TTL compatibility |
| fMAX (Typ.) | 250MHz at VCC = 5V - enables high-throughput data capture in fast synchronous logic |
| IOL / IOH (Min.) | 24mA - drives 50Ω transmission lines directly without external buffers |
| tPLH / tPHL (Max.) | 9.0ns at 5V - ensures balanced timing margins for setup/hold compliance |
| VIH / VIL (Min./Max.) | 3.15V / 1.35V at VCC = 4.5V - guarantees robust noise margin across industrial temperature range |
| ICC (Max.) | 160µA at -55°C to +125°C - maintains ultra-low static power in battery-backed or thermally constrained systems |
| ESD Immunity | 2kV HBM - protects against handling-induced discharge during board assembly and test |
Pinout & Package
74AC273MTR is supplied in a 20-lead SOIC (Small Outline Integrated Circuit) package, tape-and-reel format, with 0.65mm lead pitch and JEDEC MS-013 compliant dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLEAR | Asynchronous master reset (active LOW); forces all Q outputs LOW regardless of clock or D inputs |
| 2,5,6,9,12,15,16,19 | Q0–Q7 | Complementary registered outputs; retain state until next clock edge or CLEAR assertion |
| 3,4,7,8,13,14,17,18 | D0–D7 | Data inputs synchronized to positive clock edge; sampled only on rising edge |
| 11 | CLOCK | Edge-triggered input (LOW-to-HIGH); controls simultaneous latching of all eight D inputs |
| 10 | GND | Ground reference (0V) for all internal logic and I/O stages |
| 20 | VCC | Positive supply rail (2–6V); powers core logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Pin & function compatibility with 74 series 273 | Enables drop-in replacement in legacy 74LS/74HC-based designs without PCB or firmware changes |
| 50Ω transmission line driving | Eliminates need for external series termination resistors in high-speed backplane or memory bus applications |
| Balanced tPLH ≅ tPHL | Reduces clock skew sensitivity and simplifies timing closure in synchronous state machines |
| High noise immunity (28% VCC min) | Ensures reliable operation in electrically noisy industrial environments with >1.4V noise margin at 5V |
| Improved latch-up immunity | Prevents destructive parasitic SCR conduction during overvoltage transients or hot-plug events |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Latching sensor status signals (door open/closed, seatbelt buckle) before CAN message framing. IC Role / Device Role / Timing Role: Synchronous data register capturing parallel switch inputs on vehicle wake-up clock edge. Use Value: Provides deterministic sampling window and noise-immune storage prior to microcontroller read, reducing false trigger rate. | Use Scenario: Holding headlight, wiper, and HVAC actuator enable states during MCU boot sequence. IC Role / Device Role / Timing Role: Non-volatile shadow register maintaining safe default outputs until firmware initialization completes. Use Value: Prevents uncontrolled actuator activation during power-on reset using hardware-level asynchronous CLEAR control. |
| Test Equipment Digital Pattern Generator | Legacy Industrial Bus Interface |
Use Scenario: Generating precise multi-bit stimulus waveforms for IC functional validation. IC Role / Device Role / Timing Role: High-speed parallel output stage synchronized to pattern generator clock domain. Use Value: Delivers 24mA drive into 50Ω loads at 250MHz, enabling clean edge integrity without external drivers. | Use Scenario: Interfacing 8-bit microcontrollers to ISA or VME bus data latches. IC Role / Device Role / Timing Role: Address/data latch bridging between CPU and peripheral address decoding logic. Use Value: Maintains full 74-series pinout and timing compatibility while upgrading speed and noise margin over 74LS273. |
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 |
|---|---|---|---|
| 74AC273M | Tape-and-reel variant differs only in packaging (same die, same SOIC-20 footprint) | No functional difference; used where manual placement or small-batch prototyping is required | Select 74AC273MTR for automated SMT production; choose 74AC273M for hand-soldered evaluation or low-volume builds |
| SN74AC273PWR | Texas Instruments version in TSSOP-20; identical AC/DC specs but different thermal resistance and moisture sensitivity level | Suitable for space-constrained PCBs; requires reflow profile adjustment due to thinner package | Prefer SN74AC273PWR only when board area is critical and TI's qualification documentation meets program requirements |
Compared with 74AC273M and SN74AC273PWR, the 74AC273MTR offers optimized logistics for high-volume SMT manufacturing via tape-and-reel delivery, while retaining full electrical and timing equivalence to the base 74AC273 function across all three variants.
Availability
74AC273MTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and test equipment digital pattern generation requiring stable component supply and long-term lifecycle support.
Supply support for 74AC273MTR 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 broad analog, digital, and mixed-signal product portfolios.
The 74AC273 belongs to ST's advanced CMOS logic family, engineered for high-speed, low-power, and high-noise-immunity operation in mission-critical industrial and automotive control systems.
FAQ
What is the maximum clock frequency supported by the 74AC273MTR?
The 74AC273MTR achieves a typical maximum clock frequency of 250MHz at VCC = 5V and TA = 25°C, with guaranteed minimum of 125MHz across the full -55°C to +125°C operating temperature range per AC electrical characteristics table.
Does the 74AC273MTR require external pull-up or pull-down resistors on unused inputs?
No. All inputs feature integrated protection circuitry and defined logic thresholds; however, floating inputs must be avoided. Unused D inputs should be tied to VCC or GND, and unused Q outputs left open, as specified in ST's application guidelines for AC logic devices.
Can the 74AC273MTR operate reliably at 3.3V supply voltage?
Yes. The device is fully characterized from 2V to 6V, with DC and AC parameters guaranteed at 3.3V ±0.3V. At 3.3V, fMAX is 90MHz (typ.), VIH is 2.1V (min), and VOL remains ≤0.1V at 50µA load - meeting standard 3.3V LVTTL interface requirements.
Is the 74AC273MTR pin-compatible with older 74LS273 devices?
Yes - it is pin- and function-compatible with the 74LS273, including identical pin numbering, clock edge behavior, and asynchronous CLEAR functionality. However, it requires no external pull-ups, draws significantly less quiescent current, and operates across a wider voltage and temperature range.
74AC273MTR 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:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 250 MHz
- Max Propagation Delay @ V, Max CL:
- 9ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 4 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74AC273MTR FAQ
1.How can I place an order for 74AC273MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC273MTR 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 74AC273MTR reliable?
The price and inventory of 74AC273MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC273MTR is usually 5 days.
3.What payment methods are accepted for 74AC273MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC273MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC273MTR?
74AC273MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC273MTR 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 74AC273MTR?
For technical support, including 74AC273MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC273MTR requirements.
6.How does Aetrix verify that 74AC273MTR is sourced from the original manufacturer or authorized distributors?
All 74AC273MTR 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 74AC273MTR meets industry standards.
7.What is the process for return or replacement of 74AC273MTR?
All 74AC273MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC273MTR, 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 74AC273MTR part is unused and in its original packaging.
Return procedure for 74AC273MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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