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Texas Instruments SN74HCT273ANS
- Part No.:
- SN74HCT273ANS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HCT273ANS.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,480
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Product details
Overview
SN74HCT273ANS from NXP Semiconductors is an octal positive-edge-triggered D-type flip-flop with synchronous clock and asynchronous master reset (MR), operating at 4.5 V to 5.5 V supply, delivering 16 ns typical propagation delay (CP to Qn) at VCC = 4.5 V and CL = 50 pF, and used for data latching and state synchronization in digital control logic, bus interface circuits, and microcontroller peripheral expansion.
For engineers reviewing the SN74HCT273ANS datasheet, SN74HCT273ANS pinout, SN74HCT273ANS application, or SN74HCT273ANS equivalent, this page provides verified functional identity, TTL-compatible input thresholds, DIP20 package mapping, timing parameters across −40 °C to +125 °C, and validated alternative parts for industrial logic design and legacy system replacement.
Technical Context
The SN74HCT273ANS implements eight independent D-type flip-flops sharing a common clock (CP) and active-low master reset (MR). Its TTL-level inputs (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure direct compatibility with 5 V TTL logic families without level shifting.
Each flip-flop captures Dn input states on the LOW-to-HIGH CP transition, provided setup (tsu = 12 ns min) and hold (th = 3 ns min) times are met. MR forces all Qn outputs LOW independently of clock or data, enabling global state initialization in synchronous systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible CMOS, enabling direct interfacing with legacy 5 V TTL outputs and inputs |
| Supply Voltage Range | 4.5 V to 5.5 V - supports standard 5 V rail operation with ±5% tolerance margin |
| Propagation Delay (CP→Qn) | 16 ns typical at VCC = 4.5 V, CL = 50 pF - defines maximum clock-to-output timing budget in synchronous pipelines |
| Maximum Clock Frequency | 30 MHz typical at VCC = 4.5 V - sets upper limit for reliable data capture rate in latch-based control loops |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures robust noise immunity and compatibility with 5 V TTL output swing |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood automotive, industrial PLC, and extended-temperature embedded applications |
| ESD Protection | HBM > 2000 V, MM > 200 V - meets JEDEC JESD22-A114F/A115-A for handling and board assembly reliability |
Pinout & Package
SN74HCT273ANS uses the plastic dual in-line package (DIP20), SOT146-1, with 300-mil lead spacing and through-hole mounting. The package includes 20 leads, 10 per side, with pin 1 marked by a notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR | Master reset input (active LOW); forces all Qn outputs LOW regardless of clock or data state |
| 2, 5, 6, 9, 12, 15, 16, 19 | Q0–Q7 | Flip-flop outputs; reflect latched Dn values after valid CP edge when MR is HIGH |
| 3, 4, 7, 8, 13, 14, 17, 18 | D0–D7 | Data inputs; sampled on LOW-to-HIGH CP transition if setup/hold timing met |
| 10 | GND | Ground reference (0 V); required return path for all internal logic and I/O current |
| 11 | CP | Clock input (edge-triggered); rising edge initiates sampling of Dn inputs into Qn outputs |
| 20 | VCC | Positive supply voltage (4.5–5.5 V); powers internal logic and drives output stages |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flops with shared clock and reset | Enables compact, synchronized storage of 8-bit parallel data using one control signal pair (CP/MR) |
| TTL-compatible input thresholds | Eliminates need for external level shifters when interfacing with legacy 5 V TTL microcontrollers or peripherals |
| JEDEC Standard No. 7A compliance | Ensures interoperability and mechanical/electrical consistency with industry-standard logic devices |
| Clamp diodes on all inputs | Allows safe interface to voltages exceeding VCC via current-limiting resistors, supporting mixed-voltage debugging |
| −40 °C to +125 °C operation | Supports deployment in harsh environments including automotive engine control units and industrial motor drives |
Applications
| Industrial Control Logic | Microcontroller Peripheral Expansion |
|---|---|
Use Scenario: Latching sensor status bits (e.g., limit switches, fault flags) in programmable logic controllers before scanning cycle readback. IC Role / Device Role / Timing Role: Synchronous data register capturing parallel inputs on CPU-initiated clock edges, decoupling real-time sensing from scan timing. Use Value: Prevents metastability and race conditions during multi-bit status acquisition, ensuring deterministic state capture at known intervals. | Use Scenario: Extending GPIO count of an 8-bit MCU (e.g., ATmega328P) to drive 8-segment LED displays or relay banks. IC Role / Device Role / Timing Role: Output latch buffering MCU port pins, holding display/relay states while the CPU refreshes other subsystems. Use Value: Offloads timing-critical output maintenance from firmware, freeing CPU cycles and eliminating flicker or glitch during updates. |
| Bus Interface Isolation | Digital Signal Synchronization |
Use Scenario: Isolating address/data bus signals between two clock domains (e.g., FPGA fabric and legacy 5 V peripheral ASIC). IC Role / Device Role / Timing Role: Level-shifting and domain-crossing register synchronizing asynchronous bus writes to prevent setup/hold violations. Use Value: Enables reliable handshaking across clock boundaries without custom synchronizer logic or additional glue ICs. | Use Scenario: Capturing asynchronous interrupt request lines (e.g., from external sensors) into a synchronous processor clock domain. IC Role / Device Role / Timing Role: Metastability-hardened input synchronizer stage, using MR to clear stale states before next sample window. Use Value: Reduces risk of missed or double-counted interrupts by enforcing clean, single-cycle registration of asynchronous events. |
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 |
|---|---|---|---|
| 74HCT273D | SO20 surface-mount package (SOT163-1); identical electrical specs and pinout mapping | Requires PCB rework for SMT assembly; not suitable for through-hole prototyping or repair | Select when automated assembly, space constraints, or thermal performance in compact layouts are priorities |
| MC74HCT273ANG | Same DIP20 package and pinout; manufactured by ON Semiconductor; identical HCT logic family and timing | No functional difference; qualifies as second-source part with separate qualification history | Select for supply chain diversification or procurement flexibility without design change |
Compared with SN74HCT273ANS, the SO20 74HCT273D enables higher-density board layouts but requires reflow soldering, while the MC74HCT273ANG offers identical through-hole compatibility and drop-in replacement capability for dual-sourcing resilience.
Availability
SN74HCT273ANS is available at Aetrix Electronics and suitable for industrial control logic, microcontroller peripheral expansion, and bus interface isolation requiring stable component supply across extended temperature ranges and long-lifecycle programs.
Supply support for SN74HCT273ANS 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The SN74HCT273ANS belongs to NXP's legacy 74HCT logic family, designed for robust, pin-compatible replacement of obsolete TTL devices in industrial and automotive control systems requiring wide temperature operation and high noise immunity.
FAQ
What is the supply voltage range for SN74HCT273ANS?
The SN74HCT273ANS operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures compatibility with standard 5 V TTL systems while accommodating typical power rail tolerances. Operation outside this range may cause unreliable behavior or permanent damage, as defined in the Absolute Maximum Ratings table. The device draws minimal quiescent current (≤160 µA at VCC = 5.5 V), supporting low-power designs without compromising speed.
Does SN74HCT273ANS support asynchronous reset?
Yes, SN74HCT273ANS features an asynchronous master reset (MR) input on Pin 1. When MR is driven LOW, all eight Qn outputs are forced LOW immediately-regardless of clock state or data inputs. This function operates independently of the CP signal and satisfies timing requirements for immediate system initialization or fault recovery. The MR input has TTL-compatible thresholds and includes internal clamp diodes for robustness against voltage overshoot.
What package type does SN74HCT273ANS use?
SN74HCT273ANS uses the plastic dual in-line package (DIP20), also designated SOT146-1, with 300-mil lead spacing and through-hole mounting. It contains 20 leads, 10 per side, with pin 1 identified by a notch or dot. This package supports breadboard prototyping, manual soldering, and legacy PCB layouts. Thermal dissipation is rated at 750 mW at Tamb ≤ 70 °C, derating linearly above that temperature.
How does SN74HCT273ANS differ from SN74HC273N?
SN74HCT273ANS uses TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), whereas SN74HC273N uses CMOS thresholds (VIH ≈ 3.15 V min at VCC = 4.5 V). This makes SN74HCT273ANS directly compatible with 5 V TTL outputs without level shifting, while SN74HC273N requires matched CMOS drivers. Both share identical pinout, clock/reset architecture, and DIP20 packaging, but their input sensitivity differs fundamentally.
Can SN74HCT273ANS be used in automotive applications?
Yes, SN74HCT273ANS is qualified for operation from −40 °C to +125 °C and meets JEDEC Standard No. 7A, making it suitable for under-hood automotive applications such as engine control modules and body electronics. Its HCT logic family provides strong noise immunity, and the DIP20 package supports reliable through-hole mounting in vibration-prone environments. However, it is not AEC-Q100 qualified; for certified automotive use, consult NXP's AEC-Q100-compliant variants or confirm qualification status with the manufacturer.
SN74HCT273ANS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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:
- 37 MHz
- Max Propagation Delay @ V, Max CL:
- 34ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74HCT273ANS FAQ
1.How can I place an order for SN74HCT273ANS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT273ANS 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 SN74HCT273ANS reliable?
The price and inventory of SN74HCT273ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT273ANS is usually 5 days.
3.What payment methods are accepted for SN74HCT273ANS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT273ANS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT273ANS?
SN74HCT273ANS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT273ANS 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 SN74HCT273ANS?
For technical support, including SN74HCT273ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT273ANS requirements.
6.How does Aetrix verify that SN74HCT273ANS is sourced from the original manufacturer or authorized distributors?
All SN74HCT273ANS 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 SN74HCT273ANS meets industry standards.
7.What is the process for return or replacement of SN74HCT273ANS?
All SN74HCT273ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT273ANS, 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 SN74HCT273ANS part is unused and in its original packaging.
Return procedure for SN74HCT273ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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