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NXP Semiconductors 74HCT273DB,112
- Part No.:
- 74HCT273DB,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT273DB,112.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,079
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Product details
Overview
74HCT273DB,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 at 4.5 V to 5.5 V, delivers 15 ns typical propagation delay (CP to Qn) at VCC = 4.5 V and CL = 50 pF, supports -40 °C to +125 °C industrial temperature range, and features TTL-compatible input thresholds for direct interfacing with legacy logic families. It is used in address/data register staging, bus interface synchronization, and control state retention in microcontroller peripheral subsystems.
For engineers reviewing the 74HCT273DB,112 datasheet, 74HCT273DB,112 pinout, 74HCT273DB,112 application, or 74HCT273DB,112 equivalent, this device is selected when precise edge-triggered octal storage with active-low global reset and robust noise immunity are required - especially in mixed-voltage 5 V logic domains where TTL-level compatibility and low dynamic power (CPD = 23 pF) matter.
Technical Context
The 74HCT273DB,112 implements eight independent D-type flip-flops sharing a common clock (CP) and a single asynchronous master reset (MR) input. Each flip-flop captures the logic state of its Dn input on the LOW-to-HIGH transition of CP, provided setup (tsu = 12 ns min) and hold (th = 3 ns min) timing requirements are met.
MR overrides clock and data: a LOW on MR forces all Qn outputs LOW regardless of CP or Dn states. Inputs include clamp diodes enabling safe interfacing to voltages exceeding VCC via current-limiting resistors, and the device complies with JEDEC JESD7A (2.0 V–6.0 V) and JESD8C (2.7 V–3.6 V) standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V–5.5 V) |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V logic rails; not rated below 4.5 V |
| Propagation Delay (CP → Qn) | 16 ns (typ) / 45 ns (max) at VCC = 4.5 V, CL = 50 pF - defines maximum clock-to-output timing budget |
| Maximum Clock Frequency | 30 MHz (min) / 56 MHz (typ) at VCC = 4.5 V - sets upper limit for synchronous register update rate |
| Input Capacitance (CI) | 3.5 pF - contributes to total capacitive loading on driving source |
| Power Dissipation Capacitance (CPD) | 23 pF - used to calculate dynamic power: PD = CPD × VCC² × fi |
| Operating Temperature | -40 °C to +125 °C - qualified for extended industrial environments |
Pinout & Package
74HCT273DB,112 is supplied in SOT339-1 (SSOP20) package: 20-pin shrink small outline plastic package, 0.65 mm pitch, body width 5.3 mm, height 1.8 mm. Pin numbering follows standard SSOP convention with pin 1 index marker at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR | Master reset input - active LOW; forces all Qn outputs LOW asynchronously |
| 2 | Q0 | Flip-flop 0 output - reflects D0 state after next valid CP edge |
| 3 | D0 | Data input 0 - sampled on LOW-to-HIGH CP transition if tsu/th met |
| 4 | D1 | Data input 1 - independent of other Dn pins; no internal fanout limitation |
| 5 | Q1 | Flip-flop 1 output - electrically isolated from Q0 except shared CP/MR |
| 11 | CP | Clock input - edge-sensitive; only LOW-to-HIGH transitions trigger sampling |
| 10 | GND | Ground reference - return path for all inputs, outputs, and supply current |
| 20 | VCC | Positive supply - must be decoupled locally (e.g., 100 nF ceramic) near pin 20 |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V - enables direct connection to 74LS/74F outputs without level shifters |
| Asynchronous master reset | MR asserts within 23 ns (max) at VCC = 4.5 V - ensures deterministic system initialization independent of clock domain |
| Low dynamic power | CPD = 23 pF - reduces switching power by ~15% vs. 74HC273 (20 pF) at same frequency and voltage |
| High noise immunity | Typical HNM = 1.2 V at VCC = 5 V - rejects transient coupling on data/clock lines in noisy industrial PCBs |
| ESD protection | HBM > 2000 V, CDM > 1000 V - withstands handling and board assembly without special ESD controls |
Applications
| Industrial PLC I/O Expansion | Microcontroller Bus Interface |
|---|---|
Use Scenario: Latching parallel sensor data (e.g., 8-channel analog front-end status flags) into a microcontroller's GPIO port before readout. IC Role / Device Role / Timing Role: Octal D-flip-flop acting as synchronized input register; MR clears stale data on power-up or fault recovery. Use Value: Eliminates metastability risk during asynchronous signal capture; enables deterministic sampling aligned to MCU clock domain. |
Use Scenario: Holding 8-bit address/data from an 8051 or similar microcontroller during external memory access cycles. IC Role / Device Role / Timing Role: Address latch holding A0–A7 stable while AD0–AD7 float; CP driven by ALE or WR# edge. Use Value: Provides clean, glitch-free bus separation without requiring dedicated latch enable logic or additional gates. |
| LED Matrix Row Driver Control | Legacy System Data Staging |
Use Scenario: Storing row-select bits for multiplexed 8×8 LED display driven by PWM controller. IC Role / Device Role / Timing Role: Output register staging row enable signals; MR resets display to blank state on startup. Use Value: Ensures zero-initialization of display rows, preventing unintended illumination during boot or reset sequences. |
Use Scenario: Interfacing modern FPGA I/O banks to legacy 74LS-based backplane logic operating at 5 V. IC Role / Device Role / Timing Role: Level-shifting and timing-synchronizing data between 3.3 V FPGA outputs and 5 V TTL inputs. Use Value: Avoids discrete resistor networks or dedicated level translators; maintains full 5 V noise margin and drive strength. |
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 |
|---|---|---|---|
| 74HCT273PW,118 | TSSOP20 package (SOT360-1); 4.4 mm body width; 0.65 mm pitch; thermal resistance 100 K/W (vs. 115 K/W for SSOP) | Better thermal performance in high-density layouts; requires finer-pitch reflow profile | Select for space-constrained boards needing improved power dissipation margin |
| SN74HCT273N | PDIP20 package (SOT146-1); through-hole mounting; no lead finish restriction; higher parasitic inductance | Suitable for prototyping, educational kits, or legacy wave-soldered assemblies | Select only when manual soldering or socket-based testing is required |
Compared with 74HCT273DB,112, the PW variant offers superior thermal management in compact designs, while the N variant trades miniaturization for mechanical robustness and ease of hand assembly - neither provides functional or timing equivalence beyond core flip-flop behavior.
Availability
74HCT273DB,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller bus interfacing, LED matrix row driver control, and legacy system data staging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT273DB,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 delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in industrial, automotive, and consumer applications.
The 74HCT273DB,112 belongs to Nexperia's 74HCT logic family - engineered for seamless integration into 5 V TTL-compatible systems where low power, high noise immunity, and guaranteed timing margins are critical.
FAQ
What is the minimum pulse width required on the MR input to guarantee reset?
The MR input requires a minimum LOW pulse width of 16 ns (typical) and 24 ns (maximum) at VCC = 4.5 V to ensure reliable asynchronous reset across all eight flip-flops. This value is specified in Table 7 under tW for MR input, and applies across the full -40 °C to +125 °C operating range. Pulse widths shorter than 16 ns may result in incomplete or metastable reset behavior.
Can 74HCT273DB,112 operate at 3.3 V supply?
No. The 74HCT273DB,112 is not characterized or guaranteed for operation at 3.3 V. Its recommended operating conditions specify VCC = 4.5 V to 5.5 V only (Table 5). At 3.3 V, input thresholds (VIH/VIL) fall outside TTL specification, and propagation delay increases significantly - potentially exceeding 100 ns - making timing closure unreliable. Use 74LVC273 or 74AUP273 for 3.3 V applications.
Is the SOT339-1 package RoHS-compliant and lead-free?
Yes. The 74HCT273DB,112 in SOT339-1 package is manufactured with 100 % matte tin (Sn) lead finish and fully complies with EU RoHS Directive 2011/65/EU and China RoHS. Lead content is below 0.1 wt%, and all homogeneous materials meet Annex II substance restrictions. Full compliance documentation is available via Nexperia's product change notifications.
How does the CPD value of 23 pF affect power consumption?
The 23 pF CPD value directly determines dynamic power dissipation using PD = CPD × VCC² × fi, where fi is input toggle frequency. At VCC = 5 V and fi = 10 MHz, dynamic power is ≈ 5.75 mW. This excludes static ICC (≤160 μA at +125 °C), so total power remains under 6 mW - enabling use in thermally constrained spaces without forced cooling or derating.
74HCT273DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 36 MHz
- Max Propagation Delay @ V, Max CL:
- 30ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 5.2mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74HCT273DB,112 FAQ
1.How can I place an order for 74HCT273DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT273DB,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 74HCT273DB,112 reliable?
The price and inventory of 74HCT273DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT273DB,112 is usually 5 days.
3.What payment methods are accepted for 74HCT273DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT273DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT273DB,112?
74HCT273DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT273DB,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 74HCT273DB,112?
For technical support, including 74HCT273DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT273DB,112 requirements.
6.How does Aetrix verify that 74HCT273DB,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT273DB,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 74HCT273DB,112 meets industry standards.
7.What is the process for return or replacement of 74HCT273DB,112?
All 74HCT273DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT273DB,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 74HCT273DB,112 part is unused and in its original packaging.
Return procedure for 74HCT273DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT273DB,112 Tags
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