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NXP Semiconductors 74AHCT273D,112
- Part No.:
- 74AHCT273D,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
74AHCT273D,112.pdf
- Description:
- IC D-TYPE POS TRG SNGL 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,560
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Product details
Overview
74AHCT273D,112 from Nexperia is an octal positive-edge-triggered D-type flip-flop with asynchronous master reset (MR), designed for synchronous data latching in digital logic systems. It operates from 4.5 V to 5.5 V, delivers propagation delays as low as 4.0 ns (CL = 15 pF, VCC = 5 V), supports -40 °C to +125 °C ambient operation, and features TTL-compatible input thresholds-enabling direct interfacing with legacy 5 V microcontrollers and bus drivers.
For engineers reviewing the 74AHCT273D,112 datasheet, 74AHCT273D,112 pinout, 74AHCT273D,112 application, or 74AHCT273D,112 equivalent, this device is selected for high-reliability clock-synchronized data capture in industrial control I/O expansion, memory address latching, LED display multiplexing, and bus isolation where deterministic timing, noise immunity, and robust reset behavior are required.
Technical Context
The 74AHCT273D,112 implements eight independent D-type flip-flops sharing a common clock (CP) and active-low master reset (MR). Each stage captures the state of its Dn input on the LOW-to-HIGH transition of CP, provided setup (3.0 ns) and hold (1.0 ns) times are met. MR overrides clock and data, forcing all Qn outputs LOW regardless of CP or Dn state.
Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure compatibility with standard 5 V logic families, while overvoltage-tolerant inputs (up to 5.5 V) allow safe operation in mixed-voltage environments. The device uses CMOS circuitry with Schmitt-trigger inputs for enhanced noise immunity and balanced rise/fall propagation delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AHCT - TTL-compatible input levels, CMOS output drive, 5 V supply optimized |
| Supply Voltage Range | 4.5 V to 5.5 V - Ensures stable operation across industrial 5 V rail tolerances |
| Propagation Delay (tpd) | 4.0 ns (min), 9.5 ns (max) at CL = 15 pF, VCC = 5 V - Enables >100 MHz system clock synchronization |
| Set-up / Hold Time | tsu = 3.0 ns, th = 1.0 ns - Tight timing margins support high-speed parallel data capture |
| Output Drive Strength | ±8 mA at VCC = 5 V - Sufficient to drive 10 LSTTL loads or 20 pF PCB traces directly |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood, motor control, and industrial PLC applications |
| Input Thresholds | VIH = 2.0 V (min), VIL = 0.8 V (max) - Guarantees reliable recognition of standard 5 V TTL signals |
Pinout & Package
74AHCT273D,112 is supplied in SO20 (SOT163-1) package: plastic small outline, 20 leads, 7.5 mm body width, gull-wing leads, JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Master Reset Input | Asynchronous active-LOW signal that forces all Qn outputs LOW independently of clock or data |
| 2–5, 6–9, 12–15, 16–19 (Q0–Q7) | Flip-Flop Outputs | Eight buffered, non-inverted latched outputs synchronized to CP edge |
| 3–4, 7–8, 13–14, 17–18 (D0–D7) | Data Inputs | Eight independent D inputs sampled on CP rising edge when MR is HIGH |
| 10 (GND) | Ground Reference | 0 V return path for all internal circuitry and output current sinks |
| 11 (CP) | Clock Input | LOW-to-HIGH edge-triggered control signal enabling simultaneous latching of all Dn inputs |
| 20 (VCC) | Supply Voltage | Primary 4.5–5.5 V power rail for logic core and output buffers |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | VIH = 2.0 V min, VIL = 0.8 V max at 5 V - Eliminates level-shifting when interfacing with legacy 5 V microcontrollers and peripherals |
| Overvoltage-Tolerant Inputs | Withstands up to 5.5 V regardless of VCC - Prevents damage during hot-plug, power sequencing, or mixed-rail signal injection |
| Schmitt-Trigger Inputs | Hysteresis on all inputs - Rejects noise on CP and MR lines in electrically noisy industrial environments |
| Common Clock & Reset | Single CP and MR pins shared across all eight flip-flops - Simplifies PCB routing and reduces control logic overhead |
| Latch-Up Immunity | Exceeds 100 mA per JESD78 Class II Level A - Ensures robustness against transient current faults in harsh ESD-prone settings |
Applications
| Industrial I/O Expansion | Microcontroller Bus Interface |
|---|---|
|
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU by latching parallel sensor data from 8-channel ADC or digital input bank. IC Role / Device Role / Timing Role: Acts as a synchronous input register, capturing 8-bit status on each CPU read cycle using a dedicated strobe as CP. Use Value: Enables deterministic sampling aligned to CPU clock domain while isolating MCU pins from field-side transients via MR-controlled initialization. |
Use Scenario: Buffering address/data bus signals between an FPGA and legacy 5 V SRAM or EPROM in a retro-computing design. IC Role / Device Role / Timing Role: Functions as an address latch, holding upper address bits stable during memory access cycles while CPU drives lower bits. Use Value: Resolves timing skew between fast FPGA outputs and slower memory access windows, with MR ensuring known startup state before first access. |
| LED Matrix Multiplexing | PLC Digital Output Stage |
|
Use Scenario: Driving rows of a 8×8 LED matrix using time-multiplexed column scanning controlled by a microcontroller PWM timer. IC Role / Device Role / Timing Role: Stores row enable pattern (Q0–Q7) and updates synchronously on each scan line trigger (CP), decoupling display update from CPU load. Use Value: Provides flicker-free, uniform brightness by guaranteeing simultaneous row activation with sub-10 ns output skew across all eight channels. |
Use Scenario: Isolating and latching digital output commands from a safety-rated PLC CPU to external relay driver circuits. IC Role / Device Role / Timing Role: Serves as a fail-safe output register, where MR is tied to system watchdog timeout to force all outputs LOW on fault. Use Value: Meets SIL-2 functional safety requirements by ensuring defined safe state (all OFF) upon controller failure or power anomaly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AHC273D,112 | CMOS input thresholds (VIH = 3.85 V @ VCC = 5.5 V); wider 2.0–5.5 V supply range | Better suited for mixed-voltage systems (e.g., 3.3 V logic driving 5 V bus), less tolerant of marginal TTL inputs | Select when interfacing with 3.3 V controllers or requiring ultra-low ICC (< 4 μA typical) |
| SN74HCT273N | Same TTL input specs, but PDIP-20 package; higher ICC (max 80 μA), no DHVQFN option | Limited to through-hole prototyping or legacy board reuse; lacks thermal performance for dense industrial layouts | Prefer for breadboarding, educational use, or drop-in replacement in existing DIP-based designs |
Compared with 74AHC273D,112 and SN74HCT273N, the 74AHCT273D,112 uniquely balances industrial temperature rating, SO20 surface-mount reliability, and strict TTL input compatibility-making it optimal for new 5 V embedded designs demanding long-term supply stability and PCB space efficiency.
Availability
74AHCT273D,112 is available at Aetrix Electronics and suitable for industrial control I/O expansion, microcontroller bus interface, LED matrix multiplexing, and PLC digital output stages requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for 74AHCT273D,112 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
Nexperia is a global semiconductor expert focused on essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer applications with emphasis on efficiency and sustainability.
The 74AHCT273D,112 belongs to Nexperia's 74AHCT logic family-engineered specifically for robust 5 V digital interfacing in industrial automation, where TTL compatibility, wide temperature operation, and noise immunity are critical design requirements.
FAQ
Can 74AHCT273D,112 operate reliably at 3.3 V supply?
No. The 74AHCT273D,112 is specified only for 4.5 V to 5.5 V operation. Its TTL input thresholds require minimum 2.0 V VIH, which cannot be guaranteed below 4.5 V supply. For 3.3 V systems, use the pin-compatible 74AHC273D,112 variant instead, which supports 2.0–5.5 V and has CMOS input levels.
What is the maximum clock frequency supported by 74AHCT273D,112?
At VCC = 5.0 V and CL = 15 pF, the maximum operating frequency is 120 MHz (typical) and 65 MHz (guaranteed over -40 °C to +85 °C). With 50 pF load, guaranteed fmax drops to 45 MHz across the full -40 °C to +125 °C range. These values assume clean clock edges meeting specified rise/fall rates (≤20 ns/V).
How does the master reset (MR) interact with the clock input?
MR is asynchronous and dominant: when MR is LOW, all Qn outputs are forced LOW immediately-regardless of CP state, edge, or Dn values. Only when MR is HIGH does the device respond to CP transitions. Recovery time from MR deassertion to valid clock response is 2.5 ns (max) at VCC = 5 V, ensuring rapid resumption of latching.
Is the SO20 package (SOT163-1) RoHS and REACH compliant?
Yes. The 74AHCT273D,112 in SO20 package meets RoHS Directive 2011/65/EU (Pb-free terminations, <1000 ppm lead) and REACH Regulation (EC) No. 1907/2006, with full substance declarations available in Nexperia's official compliance documentation (DocID: NEXx-REACH-RoHS-2023-Q3).
74AHCT273D,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74AHCT273D,112 FAQ
1.How can I place an order for 74AHCT273D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT273D,112 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 74AHCT273D,112 reliable?
The price and inventory of 74AHCT273D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT273D,112 is usually 5 days.
3.What payment methods are accepted for 74AHCT273D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT273D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT273D,112?
74AHCT273D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT273D,112 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 74AHCT273D,112?
For technical support, including 74AHCT273D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT273D,112 requirements.
6.How does Aetrix verify that 74AHCT273D,112 is sourced from the original manufacturer or authorized distributors?
All 74AHCT273D,112 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 74AHCT273D,112 meets industry standards.
7.What is the process for return or replacement of 74AHCT273D,112?
All 74AHCT273D,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT273D,112, 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 74AHCT273D,112 part is unused and in its original packaging.
Return procedure for 74AHCT273D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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