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NXP Semiconductors 74HCT273N,652
- Part No.:
- 74HCT273N,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HCT273N,652.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,588
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Product details
Overview
74HCT273N,652 from Nexperia is an octal positive-edge-triggered D-type flip-flop with asynchronous master reset (MR), TTL-compatible input levels, 20-pin SO20 package, and operation across -40 °C to +125 °C. It latches eight parallel data bits on the LOW-to-HIGH clock transition and forces all outputs LOW when MR is asserted, enabling synchronous register control in digital logic systems such as microcontroller I/O expansion and address latching.
For engineers reviewing the 74HCT273N,652 datasheet, 74HCT273N,652 pinout, 74HCT273N,652 application, or 74HCT273N,652 equivalent, key selection criteria include TTL-level input compatibility, 4.5 V–5.5 V supply range, 16 ns typical propagation delay at 4.5 V, -40 °C to +125 °C industrial temperature grade, and SO20 footprint compatibility with legacy 74-series logic designs.
Technical Context
The 74HCT273N,652 implements eight independent edge-triggered D flip-flops sharing a common clock (CP) and active-low master reset (MR). Its TTL-compatible inputs accept 2.0 V minimum VIH and 0.8 V maximum VIL at VCC = 4.5–5.5 V, ensuring interoperability with legacy 5 V TTL logic families without level-shifting.
Each flip-flop features set-up time (12 ns min) and hold time (3 ns min) referenced to CP's LOW-to-HIGH transition, with output propagation delay (tpd) of 16–45 ns depending on VCC and load. The device supports dynamic power calculation via CPD = 23 pF and complies with JEDEC JESD7A for 2.0–6.0 V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible CMOS, enables direct interfacing with 5 V TTL drivers and receivers |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V system rails; excludes 2.0–4.4 V or 5.6–6.0 V operation |
| Propagation Delay (tpd) | 16 ns (typ) at VCC = 4.5 V, CL = 50 pF - determines maximum synchronous timing margin in register chains |
| Maximum Clock Frequency | 24 MHz (min) at VCC = 4.5 V - sets upper bound for reliable data capture rate in sequential logic |
| Input Voltage Thresholds | VIH = 2.0 V (min), VIL = 0.8 V (max) at VCC = 4.5–5.5 V - ensures noise-immune recognition of TTL logic levels |
| Operating Temperature | -40 °C to +125 °C - qualified for extended industrial environments including motor control and power conversion |
| Power Dissipation Capacitance | CPD = 23 pF - used to compute dynamic power: PD = CPD × VCC² × fi + Σ(CL × VCC² × fo) |
Pinout & Package
74HCT273N,652 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm lead pitch, and gull-wing leads compatible with standard surface-mount reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Master Reset) | Asynchronous active-low reset controlling all eight Q outputs; overrides clock and data |
| 2 | Q0 | Data output for first flip-flop; driven HIGH/LOW based on D0 state at CP edge |
| 3 | D0 | Data input for first flip-flop; sampled on LOW-to-HIGH CP transition if setup/hold met |
| 4 | D1 | Data input for second flip-flop; shares same timing constraints as D0 |
| 5 | Q1 | Data output for second flip-flop; synchronized to CP and controlled by MR |
| 6 | Q2 | Data output for third flip-flop; provides registered output for parallel bus staging |
| 7 | D2 | Data input for third flip-flop; part of 8-bit parallel input group (D0–D7) |
| 8 | D3 | Data input for fourth flip-flop; routed adjacent to D2/D4 for minimized trace skew |
| 9 | Q3 | Data output for fourth flip-flop; occupies same SO20 pin as industry-standard 74273 layout |
| 10 | GND | Ground reference (0 V) for all internal circuitry and I/O; requires low-impedance PCB plane |
| 11 | CP | Common clock input; edge-sensitive only on LOW-to-HIGH transition |
| 12 | Q4 | Data output for fifth flip-flop; electrically identical to Q0–Q3 in drive strength and timing |
| 13 | D4 | Data input for fifth flip-flop; positioned to balance loading across CP net |
| 14 | D5 | Data input for sixth flip-flop; completes lower half of 8-bit D-bus (D0–D5) |
| 15 | Q5 | Data output for sixth flip-flop; supports byte-wide latch applications |
| 16 | Q6 | Data output for seventh flip-flop; enables full 8-bit parallel output capability |
| 17 | D6 | Data input for seventh flip-flop; placed near D7 for matched routing length |
| 18 | D7 | Data input for eighth flip-flop; final bit of parallel data path |
| 19 | Q7 | Data output for eighth flip-flop; provides complete octal register output |
| 20 | VCC | Positive supply rail (4.5–5.5 V); requires local 100 nF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts standard 5 V TTL logic thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), eliminating need for external level shifters |
| Asynchronous master reset | Single-pin MR forces all eight Q outputs LOW independently of clock or data, enabling system-wide initialization |
| Industrial temperature range | Specified from -40 °C to +125 °C, supporting deployment in motor drives, PLCs, and outdoor electronics |
| Low dynamic power consumption | CPD = 23 pF enables accurate power estimation in high-frequency register applications |
| SO20 drop-in compatibility | Pinout and footprint match legacy 74273 devices, allowing direct replacement in existing PCB layouts |
Applications
| Microcontroller I/O Expansion | Address Latching in Bus Systems |
|---|---|
Use Scenario: Expanding limited GPIO count of an MCU by adding parallel output registers controlled via SPI or parallel interface. IC Role / Device Role / Timing Role: 74HCT273N,652 acts as an 8-bit output latch, capturing data on CP edge and holding stable outputs until next update. Use Value: Enables deterministic timing with 16 ns tpd and eliminates bus contention during MCU write cycles. | Use Scenario: Holding multiplexed address/data bus signals in 8080/8085-style microprocessor systems. IC Role / Device Role / Timing Role: 74HCT273N,652 captures and holds upper/lower address bytes synchronously with ALE or similar strobe. Use Value: Provides clean, glitch-free address presentation with 3 ns hold time margin and 12 ns setup time compliance. |
| Industrial Control Logic | LED Matrix Row Drivers |
Use Scenario: Driving relay banks or solenoid arrays in programmable logic controllers where deterministic output update is critical. IC Role / Device Role / Timing Role: 74HCT273N,652 serves as safety-critical output register, with MR enabling immediate de-energization of all outputs. Use Value: MR assertion guarantees sub-45 ns forced LOW response, meeting fast shutdown requirements in IEC 61508-aligned designs. | Use Scenario: Scanning rows in passive-matrix LED displays requiring precise, jitter-free row enable timing. IC Role / Device Role / Timing Role: 74HCT273N,652 latches row-select bits from a counter or shift register on each scan cycle. Use Value: 24 MHz fmax supports >1 kHz refresh rates for 24-row matrices with minimal inter-row blanking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT273PW,118 | TSSOP20 package (4.4 mm width); 10.0 mW/K thermal derating above 100 °C vs. SO20's 12.3 mW/K above 109 °C | Requires PCB redesign for smaller footprint and finer pitch; better suited for space-constrained portable designs | Select when board area is constrained and reflow profile supports TSSOP; not pin-compatible with SO20 land pattern |
| SN74HCT273N | TI-manufactured part; identical logic function and DC specs but different AC characteristics - tpd = 18 ns (typ) at 5 V, fmax = 25 MHz (min) | Valid for drop-in use in non-timing-critical 5 V systems; may require timing validation in high-speed register chains | Choose when sourcing diversity is required and TI's qualification documentation is preferred; verify setup/hold margins in target clock domain |
Compared with 74HCT273PW,118 and SN74HCT273N, the 74HCT273N,652 offers proven SO20 manufacturability, higher thermal derating margin, and Nexperia's documented -40 °C to +125 °C qualification - making it optimal for industrial PCBs where legacy footprint reuse and thermal robustness are prioritized.
Availability
74HCT273N,652 is available at Aetrix Electronics and suitable for microcontroller I/O expansion, address latching in bus systems, industrial control logic, and LED matrix row driving requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT273N,652 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 specializing in high-performance, energy-efficient logic, discrete, and MOSFET components, with manufacturing rooted in former Philips Semiconductors heritage.
The 74HCT273N,652 belongs to Nexperia's 74HCT logic family, engineered for seamless interoperability between TTL and CMOS systems in industrial, automotive (non-safety), and computing applications where reliability and wide temperature operation are essential.
FAQ
What is the supply voltage range for the 74HCT273N,652?
The 74HCT273N,652 operates within a recommended supply voltage range of 4.5 V to 5.5 V. This range ensures TTL-compatible input thresholds and specified timing performance. Operation outside this window - including below 4.5 V or above 5.5 V - is not guaranteed per the Nexperia datasheet Rev. 8 (2024), and may result in undefined logic behavior or degraded AC characteristics. The 74HCT273N,652 is not rated for 3.3 V operation.
Does the 74HCT273N,652 support 3.3 V logic inputs?
No, the 74HCT273N,652 does not reliably support 3.3 V logic inputs. Its TTL-compatible input thresholds require VIH ≥ 2.0 V (min) and VIL ≤ 0.8 V (max) at VCC = 4.5–5.5 V. While a 3.3 V HIGH signal may exceed the 2.0 V VIH minimum, noise margin is reduced and DC specs do not guarantee operation under mixed-voltage conditions. For 3.3 V systems, consider dedicated 3.3 V logic families or level translators. The 74HCT273N,652 is designed for 5 V environments.
What is the function of Pin 1 (MR) on the 74HCT273N,652?
Pin 1 of the 74HCT273N,652 is the Master Reset (MR) input, an asynchronous active-low control signal. When MR is pulled LOW, all eight Q outputs (Q0–Q7) are forced LOW immediately - independent of the clock (CP) state or data inputs (D0–D7). This provides hardware-level system reset capability. MR must be held HIGH for normal register operation. The 74HCT273N,652 datasheet specifies MR pulse width ≥ 16 ns (min) at VCC = 4.5 V for reliable assertion.
Is the 74HCT273N,652 pin-compatible with the older 74LS273?
Yes, the 74HCT273N,652 is pin-compatible with the 74LS273 in the SO20 (SOT163-1) package: identical 20-pin layout, same MR, CP, Dn, Qn, VCC, and GND assignments. However, electrical behavior differs - the 74HCT273N,652 draws significantly less supply current, has CMOS output drive, and requires no external pull-ups. System-level timing (e.g., setup/hold) must be re-validated due to different propagation delays and edge sensitivities. The 74HCT273N,652 is a functional upgrade, not a blind replacement.
What is the maximum clock frequency supported by the 74HCT273N,652?
The 74HCT273N,652 supports a minimum guaranteed maximum clock frequency (fmax) of 24 MHz at VCC = 4.5 V and CL = 50 pF, per Nexperia's datasheet Rev. 8. At VCC = 5.0 V with CL = 15 pF, fmax improves to 36 MHz (min). These values assume proper signal integrity, decoupling, and adherence to setup/hold timing. Exceeding fmax risks metastability or incorrect data capture. The 74HCT273N,652's actual usable frequency depends on board layout, load capacitance, and supply stability.
74HCT273N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 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:
- Through Hole
- Supplier Device Package:
- 20-DIP
74HCT273N,652 FAQ
1.How can I place an order for 74HCT273N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT273N,652 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 74HCT273N,652 reliable?
The price and inventory of 74HCT273N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT273N,652 is usually 5 days.
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74HCT273N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT273N,652 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 74HCT273N,652?
For technical support, including 74HCT273N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT273N,652 requirements.
6.How does Aetrix verify that 74HCT273N,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT273N,652 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 74HCT273N,652 meets industry standards.
7.What is the process for return or replacement of 74HCT273N,652?
All 74HCT273N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT273N,652, 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 74HCT273N,652 part is unused and in its original packaging.
Return procedure for 74HCT273N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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