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Texas Instruments SN74HCT273DWG4
- Part No.:
- SN74HCT273DWG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT273DWG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,097
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Product details
Overview
SN74HCT273DWG4 from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with asynchronous active-low clear (CLR), designed for synchronous data latching in 5V TTL-compatible digital systems. It operates from 4.5V to 5.5V, delivers ±4mA output drive, exhibits 12ns typical propagation delay (tpd), and draws ≤80µA quiescent current-enabling reliable register storage in industrial control logic and bus interface circuits.
For engineers reviewing the SN74HCT273DWG4 datasheet, SN74HCT273DWG4 pinout, SN74HCT273DWG4 application, or SN74HCT273DWG4 equivalent, key selection criteria include its common CLR input architecture, 20-pin SOIC (DW) package, guaranteed 20MHz operation at –40°C to +85°C, and compatibility with LSTTL loads without level-shifting.
Technical Context
The SN74HCT273DWG4 implements eight independent D-type flip-flops sharing a single clock (CLK) input and a global active-low clear (CLR) signal. Its positive-edge-triggered behavior transfers data from D inputs to Q outputs only on rising CLK transitions, while CLR forces all Q outputs low regardless of CLK state.
Designed for TTL-voltage compatibility, it accepts VIH ≥ 2.0V and VIL ≤ 0.8V over 4.5V–5.5V supply, supports up to 10 LSTTL loads per output, and features low input current (≤1µA) and low power consumption-making it suitable for noise-sensitive, power-constrained 5V logic systems requiring deterministic state reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - Ensures robust operation across standard 5V rail tolerances and brown-out immunity. |
| Propagation Delay (tpd) | 12ns typical at VCC = 5V - Enables reliable timing in 20MHz synchronous designs with margin. |
| Output Drive | ±4mA at 5V - Directly interfaces with legacy LSTTL loads without external buffers. |
| Quiescent Current (ICC) | ≤80µA maximum - Minimizes standby power in battery-backed or energy-efficient systems. |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2.0V, VIL ≤ 0.8V) - Eliminates need for level translators when driven by 5V TTL sources. |
| Operating Temperature | –40°C to +85°C - Certified for industrial-grade environmental reliability without derating. |
| Clear Function | Asynchronous, active-low CLR - Provides immediate, clock-independent reset of all eight registers. |
Pinout & Package
SN74HCT273DWG4 is housed in a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm (body: 12.8mm × 7.5mm), with gull-wing leads and RoHS-compliant NiPdAu finish. The package supports standard reflow profiles (MSL Level-1, 260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLR) | Asynchronous clear input | Active-low global reset: forces all Q outputs low immediately, independent of CLK. |
| 2–9, 12, 15–16, 19 (Q1–Q8) | Registered outputs | Eight buffered, non-inverted latched outputs synchronized to CLK↑ edge. |
| 3–4, 7–8, 13–14, 17–18 (D1–D8) | Data inputs | Eight independent D inputs; data sampled only on CLK rising edge if CLR is high. |
| 10 (GND) | Ground reference | Primary return path for logic and output currents; must be low-impedance. |
| 11 (CLK) | Clock input | Positive-edge-triggered master clock; all flip-flops update simultaneously on rising transition. |
| 20 (VCC) | Power supply | +5V supply rail; requires local 0.1µF bypass capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type register with common control | Single CLK and CLR manage all eight channels-reduces control logic overhead in bus buffering. |
| Asynchronous active-low clear | Guarantees deterministic system initialization or fault recovery without waiting for clock edge. |
| TTL-compatible input thresholds | Accepts standard 5V TTL logic levels directly-no external biasing or translation required. |
| Low-power HCT logic family | 80µA max ICC enables use in thermally constrained or always-on industrial modules. |
| 20MHz maximum clock frequency | Supports high-speed data capture in real-time I/O expansion and pattern generation applications. |
Applications
| Buffer or Storage Registers | Shift Registers |
|---|---|
Use Scenario: Holding parallel data from microcontroller GPIO ports before serial transmission or DAC loading. IC Role / Device Role / Timing Role: Synchronous 8-bit latch providing glitch-free data staging between clock domains. Use Value: Prevents metastability and ensures atomic updates via simultaneous CLK-driven sampling of all D inputs. | Use Scenario: Constructing a 24-bit shift register using three cascaded SN74HCT273DWG4 devices. IC Role / Device Role / Timing Role: Edge-triggered stage element enabling precise bit-serial data movement under shared clock control. Use Value: Deterministic setup/hold timing (25ns min tsu at 4.5V) guarantees clean inter-stage data transfer. |
| Pattern Generators | Industrial Control Logic |
Use Scenario: Generating fixed test waveforms (e.g., PWM sequences or address strobes) in automated test equipment. IC Role / Device Role / Timing Role: Static pattern store with synchronous update-outputs reflect preloaded D values on each CLK edge. Use Value: 12ns tpd and 20MHz fmax allow sub-50ns waveform edge placement accuracy. | Use Scenario: Isolating and latching sensor status bits (e.g., limit switches, fault flags) in PLC I/O modules. IC Role / Device Role / Timing Role: Noise-immune input register with hardware-initiated reset via panel-mounted emergency stop. Use Value: Asynchronous CLR enables immediate safety shutdown independent of main controller clock. |
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 |
|---|---|---|---|
| SN74HCT377N | Features clock enable (OE) instead of common clear; no asynchronous reset capability. | Suitable where gated clocking is preferred over global reset; not usable in safety-critical clear-required designs. | Select SN74HCT377N only if system-level reset is handled externally and clock gating is needed. |
| 74ACT273SCX | Higher speed (25MHz typ), 5V-only supply (4.5–5.5V), but higher ICC (200µA max) and no guaranteed 85°C operation. | Better for high-frequency test fixtures; less suitable for extended-temperature industrial environments. | Choose 74ACT273SCX when speed outweighs temperature range and power constraints. |
Compared with SN74HCT377N and 74ACT273SCX, SN74HCT273DWG4 uniquely balances industrial temperature support, ultra-low quiescent current, and hardware-level asynchronous reset-making it optimal for cost-sensitive, reliability-critical 5V control logic where deterministic initialization is mandatory.
Availability
SN74HCT273DWG4 is available at Aetrix Electronics and suitable for industrial control logic, bus interface buffering, pattern generation, and sensor data latching requiring stable component supply across long production lifecycles.
Supply support for SN74HCT273DWG4 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
Texas Instruments is a U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74HCT273DWG4 belongs to TI's HCT logic family, engineered for TTL-compatible 5V operation with low power and high noise immunity-targeting industrial control panels, instrumentation, and legacy system upgrades.
FAQ
What is the maximum clock frequency supported by SN74HCT273DWG4?
The SN74HCT273DWG4 supports a maximum clock frequency of 20MHz over its full operating temperature range (–40°C to +85°C) at VCC = 4.5V, and up to 23MHz at VCC = 5.5V. These values are guaranteed by TI's switching characteristics specifications and validated across process corners and voltage extremes.
Does SN74HCT273DWG4 require external pull-up resistors on its inputs?
No, SN74HCT273DWG4 does not require external pull-up resistors on its inputs. Its TTL-compatible inputs accept VIH ≥ 2.0V and VIL ≤ 0.8V directly, and internal design ensures stable logic states when driven properly. However, unused inputs must be tied to VCC or GND to prevent floating conditions and undefined operation.
Can SN74HCT273DWG4 drive standard LSTTL loads without buffer stages?
Yes, SN74HCT273DWG4 can drive up to 10 LSTTL loads per output, as specified in its datasheet. This capability stems from its ±4mA output drive strength at 5V, which meets the LSTTL input current requirements (IIL = –0.4mA, IIH = 20µA), eliminating the need for intermediate buffers in most 5V logic interfacing scenarios.
What is the function of Pin 1 (CLR) on SN74HCT273DWG4?
Pin 1 (CLR) on SN74HCT273DWG4 is the asynchronous active-low clear input. When asserted low, it forces all eight Q outputs to logic low immediately-regardless of CLK state or D input values. This provides instantaneous, clock-independent reset functionality critical for system initialization and fault recovery.
Is SN74HCT273DWG4 RoHS compliant and lead-free?
Yes, SN74HCT273DWG4 is RoHS compliant and features a lead-free NiPdAu (nickel-palladium-gold) lead finish. Its MSL rating is Level-1 (260°C peak reflow), and it meets JEDEC standards for moisture sensitivity and Pb-free assembly processes-verified in TI's official packaging addendum.
SN74HCT273DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- 29ns @ 5.5V, 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-SOIC
SN74HCT273DWG4 FAQ
1.How can I place an order for SN74HCT273DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT273DWG4 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 SN74HCT273DWG4 reliable?
The price and inventory of SN74HCT273DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT273DWG4 is usually 5 days.
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Once your SN74HCT273DWG4 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 SN74HCT273DWG4?
For technical support, including SN74HCT273DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT273DWG4 requirements.
6.How does Aetrix verify that SN74HCT273DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT273DWG4 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 SN74HCT273DWG4 meets industry standards.
7.What is the process for return or replacement of SN74HCT273DWG4?
All SN74HCT273DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT273DWG4, 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 SN74HCT273DWG4 part is unused and in its original packaging.
Return procedure for SN74HCT273DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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