My Inquiry
My Account
Toshiba Semiconductor and Storage TC74HC273AF(EL,F)
- Part No.:
- TC74HC273AF(EL,F)
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
TC74HC273AF(EL,F).pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,125
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TC74HC273AF(EL,F) from Toshiba is an octal D-type flip-flop with asynchronous clear, implemented in high-speed silicon-gate C2MOS technology. It operates across 2–6 V, delivers 67 MHz max clock frequency at 5 V, drives 10 LSTTL loads, and features symmetrical 4 mA output drive. It is used in synchronous data latching and register applications within industrial control logic and digital instrumentation.
For engineers reviewing the TC74HC273AF(EL,F) datasheet, TC74HC273AF(EL,F) pinout, TC74HC273AF(EL,F) application, or TC74HC273AF(EL,F) equivalent, key selection criteria include its 20-pin SOP package, asynchronous active-low CLR, positive-edge clocking, wide VCC range, and LSTTL-compatible interface behavior under CMOS power efficiency.
Technical Context
The TC74HC273AF(EL,F) implements eight independent edge-triggered D flip-flops sharing a common clock (CK) and asynchronous clear (CLR) input. Each stage transfers the D-input state to Q on the rising edge of CK, while CLR forces all Q outputs low regardless of clock or D state.
It uses C2MOS fabrication for high noise immunity (VNIH/VNIL ≥ 28% VCC), balanced propagation delays (tpLH ≈ tpHL), and low quiescent current (ICC ≤ 4 μA at 25°C). Its I/O structure supports direct interfacing with LSTTL without level-shifting across the full 2–6 V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HC - compatible with standard HC-series timing and voltage thresholds |
| Max Clock Frequency | 67 MHz (typ.) at VCC = 5 V - enables high-speed register operation in digital control loops |
| Supply Voltage Range | 2.0 to 6.0 V - supports mixed-voltage system integration including 3.3 V and 5 V domains |
| Output Drive | ±4 mA (min) - sufficient to directly drive 10 LSTTL inputs without buffer stages |
| Propagation Delay (CK→Q) | 15–25 ns (typ., CL = 15 pF, VCC = 5 V) - defines minimum clock-to-output timing margin in synchronous designs |
| Quiescent Current | 4 μA (max) at Ta = 25°C - enables ultra-low static power in battery-backed or always-on logic |
| Input Noise Immunity | ≥28% VCC (min) - ensures robust operation in electrically noisy industrial environments |
Pinout & Package
TC74HC273AF(EL,F) is supplied in a 20-pin SOP (Small Outline Package) with 1.27 mm pitch, designated SOP20-P-300-1.27A per Toshiba's package drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLR) | Asynchronous Clear Input | Active-low reset; forces all Q outputs low independently of clock or D inputs |
| 2–9 (D0–D7) | Data Inputs | Eight parallel data inputs synchronized to rising edge of CK |
| 10 (GND) | Ground Reference | Common return path for all internal circuitry and I/O |
| 11–18 (Q0–Q7) | Registered Outputs | Eight complementary latched outputs updated only on CK rising edge |
| 19 (CK) | Clock Input | Positive-edge-triggered master clock for all eight flip-flops |
| 20 (VCC) | Power Supply | Single-supply rail supporting 2–6 V operation; decoupling required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Pin and function compatibility with 74LS273 | Enables drop-in replacement in legacy TTL-based systems without PCB redesign |
| Symmetrical output impedance (|IOH| = IOL) | Ensures matched rise/fall times and predictable timing margins in bus-driven applications |
| Wide operating voltage (2–6 V) | Supports interoperability between 3.3 V microcontrollers and 5 V peripheral logic |
| High noise immunity (≥28% VCC) | Reduces susceptibility to EMI-induced glitches in factory-floor or motor-drive environments |
| Low ICC (≤4 μA) | Minimizes standby power in systems requiring long-term retention of register states |
Applications
| Industrial PLC Register Bank | Digital Panel Meter Data Capture |
|---|---|
|
Use Scenario: Storing sensor readouts or control setpoints in programmable logic controllers with deterministic update timing. IC Role / Device Role / Timing Role: Octal latch providing synchronized, glitch-free storage of 8-bit status or configuration data on each scan cycle. Use Value: Asynchronous CLR allows full register reset during fault recovery; 67 MHz capability exceeds typical PLC scan rates by >10×. |
Use Scenario: Capturing ADC output or keypad entry in handheld digital multimeters and process indicators. IC Role / Device Role / Timing Role: Interface register holding digitized values before display multiplexing or serial transmission. Use Value: Low 4 μA ICC extends battery life; 2–6 V operation matches both alkaline and Li-ion supply rails. |
| Legacy Bus Interface Adapter | Test Equipment Pattern Generator |
|
Use Scenario: Bridging modern microcontroller GPIOs to older 8-bit parallel buses (e.g., ISA, Z80, or 8080 peripherals). IC Role / Device Role / Timing Role: Level-translating register aligning MCU write cycles with slower peripheral setup/hold windows. Use Value: Pin compatibility with 74LS273 simplifies adapter board reuse; 10 LSTTL drive eliminates external buffers. |
Use Scenario: Generating stable, synchronized stimulus patterns for IC functional testing or board-level validation. IC Role / Device Role / Timing Role: Clock-synchronized pattern register feeding test vectors into DUT input pins. Use Value: Balanced tpLH/tpHL ensures precise edge alignment; 25 ns typical delay enables sub-40 MHz pattern rates. |
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 |
|---|---|---|---|
| SN74HC273N | 20-pin PDIP package; identical AC/DC specs but higher thermal resistance and larger footprint | Suitable for prototyping or through-hole assembly; not recommended for space-constrained PCBs | Select when manual soldering or breadboard evaluation is required |
| 74VHC273M | Higher fmax (110 MHz typ. at 5 V); tighter propagation skew; lower CPD (32 pF vs. 43 pF) | Better suited for high-frequency clock distribution or low-power portable devices | Select when >80 MHz operation or sub-2 μA ICC is required |
Compared with SN74HC273N and 74VHC273M, the TC74HC273AF(EL,F) offers optimal balance of industrial-grade reliability, SOP packaging for automated assembly, and proven compatibility with legacy 74LS273 layouts-making it ideal for volume production of cost-sensitive embedded controllers.
Availability
TC74HC273AF(EL,F) is available at Aetrix Electronics and suitable for industrial PLCs, digital panel meters, legacy bus adapters, and test equipment pattern generators requiring stable component supply and long-term manufacturability.
Supply support for TC74HC273AF(EL,F) 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
Toshiba Electronic Devices & Storage Corporation designs and manufactures high-reliability semiconductor components for industrial, automotive, and consumer applications, with over 50 years of analog and logic IC heritage.
The TC74HC273AF(EL,F) belongs to Toshiba's HC-series CMOS logic family, engineered for drop-in LSTTL replacement in noise-prone, wide-voltage industrial systems where low power and timing predictability are critical.
FAQ
What is the maximum operating temperature for TC74HC273AF(EL,F)?
The TC74HC273AF(EL,F) is rated for continuous operation from −40°C to +85°C ambient temperature. This range is validated per Toshiba's Operating Ranges specification and supports deployment in industrial enclosures without forced cooling. Derating applies above 65°C for power dissipation, as defined in the Absolute Maximum Ratings table. The TC74HC273AF(EL,F) maintains full functionality across this range when operated within its specified VCC and load conditions.
Does TC74HC273AF(EL,F) support 3.3 V logic levels?
Yes, the TC74HC273AF(EL,F) operates reliably at 3.3 V supply (within its 2–6 V range) and meets HC-series input thresholds: VIH ≥ 2.0 V and VIL ≤ 1.35 V at VCC = 3.3 V. Its outputs swing rail-to-rail, delivering VOH ≥ 3.1 V and VOL ≤ 0.33 V under 4 mA load - fully compatible with 3.3 V CMOS and LVTTL interfaces. The TC74HC273AF(EL,F) requires no level shifters when interfacing with 3.3 V microcontrollers.
Is TC74HC273AF(EL,F) pin-compatible with 74LS273?
Yes, the TC74HC273AF(EL,F) is explicitly designed for pin and function compatibility with the 74LS273, as confirmed in Toshiba's datasheet Features section. All 20 pins match in location and electrical role, including shared CK, CLR, D0–D7, and Q0–Q7 assignments. The TC74HC273AF(EL,F) can replace 74LS273 in existing designs, though users must verify VCC and decoupling compliance due to differing supply current profiles.
What is the meaning of "(EL,F)" in TC74HC273AF(EL,F)?
The suffix "(EL,F)" denotes Toshiba's tape-and-reel packaging variant for surface-mount assembly: "EL" indicates embossed carrier tape per EIA-481, and "F" specifies the SOP20-P-300-1.27A package. This marking distinguishes it from the tube-packaged TC74HC273AP and confirms RoHS-compliant lead-free terminations. The TC74HC273AF(EL,F) is optimized for automated pick-and-place manufacturing with standardized reel dimensions and component orientation.
Can unused inputs on TC74HC273AF(EL,F) be left floating?
No, unused inputs on the TC74HC273AF(EL,F) must not be left floating. Per Toshiba's Operating Ranges note, all unused inputs must be tied to either VCC or GND to prevent undefined logic states, increased ICC, or potential oscillation. This requirement applies to all D inputs not actively driven, as well as CK and CLR if unused in a given design. The TC74HC273AF(EL,F) lacks internal pull-up/pull-down resistors, so external termination is mandatory for stable operation.
TC74HC273AF(EL,F) Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 66 MHz
- Max Propagation Delay @ V, Max CL:
- 25ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOP
TC74HC273AF(EL,F) FAQ
1.How can I place an order for TC74HC273AF(EL,F) through Aetrix?
Please submit a Request for Quotation (RFQ) for TC74HC273AF(EL,F) 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 TC74HC273AF(EL,F) reliable?
The price and inventory of TC74HC273AF(EL,F) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC74HC273AF(EL,F) is usually 5 days.
3.What payment methods are accepted for TC74HC273AF(EL,F)?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC74HC273AF(EL,F) transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC74HC273AF(EL,F)?
TC74HC273AF(EL,F) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC74HC273AF(EL,F) 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 TC74HC273AF(EL,F)?
For technical support, including TC74HC273AF(EL,F) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC74HC273AF(EL,F) requirements.
6.How does Aetrix verify that TC74HC273AF(EL,F) is sourced from the original manufacturer or authorized distributors?
All TC74HC273AF(EL,F) 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 TC74HC273AF(EL,F) meets industry standards.
7.What is the process for return or replacement of TC74HC273AF(EL,F)?
All TC74HC273AF(EL,F) units undergo pre-shipment inspection (PSI). If there is an issue with TC74HC273AF(EL,F), 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 TC74HC273AF(EL,F) part is unused and in its original packaging.
Return procedure for TC74HC273AF(EL,F):
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TC74HC273AF(EL,F) Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
