SN74HCT273PWE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74HCT273PWE4 is an octal positive-edge-triggered D flip-flop from Texas Instruments in the HCT CMOS logic family, providing 8 synchronous data storage elements with a common clock and asynchronous active-low reset. The device clocks data at up to 20 MHz with 4 mA output sink current and 50 pF load drive capability. Packaged in a 20-pin TSSOP, it is used for bus-width registers, data storage, and pipeline buffering in 5 V digital systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HCT273PWE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74HCT273PWE4?
- Octal positive-edge D flip-flop with common clock and asynchronous reset
- Maximum clock frequency of 20 MHz at nominal supply
- 4 mA output sink current suitable for standard HCT bus loads
- 50 pF load capacitance per output for PCB trace driving
- HCT family with TTL-compatible input thresholds for 5 V interfacing
- 20-pin TSSOP (R-PDSO-G20) SMD package
What is SN74HCT273PWE4 used for?
SN74HCT273PWE4 is used as an 8-bit data register in address latching, data pipeline staging, and I/O port expansion for microcontrollers and CPUs operating at 5 V bus interfaces. Its asynchronous reset and positive-edge clock make it a straightforward choice for sequential logic designs in industrial control systems, communication interfaces, and legacy 5 V embedded computing platforms.
What are the specifications of SN74HCT273PWE4?
| YTEOL | 0 |
| Family | HCT |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | D FLIP-FLOP |
| Max Frequency@Nom-Sup | 20000000Hz |
| Max I(ol) | 0.004A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP20,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 36ns |
| Propagation Delay (tpd) | 42ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 23MHz |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Malaysia |
Where can I find the SN74HCT273PWE4 datasheet?
SN74HCT273PWE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74HCT273PWE4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
At what maximum clock frequency can SN74HCT273PWE4 reliably capture data on its 8 inputs?
SN74HCT273PWE4 is rated for a maximum clock frequency of 20 MHz at its nominal supply voltage, which covers the majority of 8-bit parallel bus and I/O register applications in embedded systems. At lower supply voltages or higher temperatures, the maximum frequency derate should be checked in the datasheet, but 20 MHz is sufficient for most industrial data acquisition and control interfaces operating below 10 MHz.
How does the asynchronous reset of SN74HCT273PWE4 benefit system initialization sequences?
The active-low asynchronous master reset (MR) pin of SN74HCT273PWE4 clears all 8 flip-flop outputs to logic 0 immediately, independent of the clock signal. This means the register can be initialized within nanoseconds of power-up or fault detection without waiting for a clock edge, which simplifies power-on reset sequencing in microcontroller peripheral interfaces, bus expanders, and output-port initialization for industrial relay drivers.
Why does SN74HCT273PWE4 use TTL-compatible input thresholds rather than standard CMOS levels?
The HCT logic family uses TTL-compatible input thresholds—VIL max of 0.8 V and VIH min of 2.0 V—which allows the SN74HCT273PWE4 to directly interface with 5 V TTL-output devices without external level shifting. This is particularly valuable in legacy system upgrades where older 74LS or 74F TTL outputs (which do not swing to full CMOS VOH of 3.8 V) must drive CMOS registers without glitches or undefined logic levels.
For a tight PCB layout, how does the 20-pin TSSOP package of SN74HCT273PWE4 compare to the PDIP alternative?
The 20-pin TSSOP package of SN74HCT273PWE4 occupies roughly 35 mm² of PCB area with a 0.65 mm pin pitch, compared to approximately 250 mm² for an equivalent 20-pin PDIP device with 2.54 mm pitch. This more than 7x footprint reduction is significant in compact industrial control boards, communication cards, and embedded computing modules where board space is constrained and SMD assembly is used.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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