My Inquiry
My Account
Nexperia USA Inc. 74HCT573DB,118
- Part No.:
- 74HCT573DB,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Latches
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT573DB,118.pdf
- Description:
- IC D-TYPE TRANSP SGL 8:8 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,705
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74HCT573DB,118 from Nexperia is an octal D-type transparent latch with 3-state outputs, designed for bus-oriented digital systems requiring data latching and output isolation. It features TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and delivers propagation delay of 20–35 ns (Dn→Qn) under typical conditions. It serves as an I/O port interface in microprocessor-based control systems.
For engineers reviewing the 74HCT573DB,118 datasheet, 74HCT573DB,118 pinout, 74HCT573DB,118 application, or 74HCT573DB,118 equivalent, key selection criteria include its TTL-level input compatibility, 3-state output enable timing (ten = 17–45 ns), latch enable active-HIGH behavior, and SO20 (SOT163-1) package footprint - all critical for bus arbitration, address/data latching, and legacy system interoperability.
Technical Context
The 74HCT573DB,118 implements eight independent D-type latches with shared LE (latch enable, active HIGH) and OE (output enable, active LOW) controls. Its transparent mode allows real-time D-input tracking when LE is HIGH; a HIGH-to-LOW LE transition captures and holds input states. OE independently places all Q outputs into high-impedance state without affecting internal latch values.
Input clamping diodes permit safe interfacing with voltages exceeding VCC when used with current-limiting resistors. The device complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), supports ESD protection per JS-001 Class 2 (>2000 V HBM) and JS-002 Class C3 (>1000 V CDM), and meets latch-up immunity >100 mA per JESD78 Class II Level B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible inputs, CMOS outputs; enables direct connection to 5 V TTL logic without level shifters. |
| Supply Voltage Range | 4.5 V to 5.5 V - matches standard 5 V system rails; excludes 3.3 V operation unlike 74HC variants. |
| Propagation Delay (Dn→Qn) | 20–53 ns at VCC = 4.5 V - determines maximum data throughput in latched bus cycles. |
| Output Enable Time (ten) | 17–45 ns - defines minimum time from OE assertion to valid high-Z state, critical for bus contention avoidance. |
| Operating Temperature | -40 °C to +125 °C - qualified for industrial and extended-temperature embedded applications. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures reliable recognition of standard TTL logic levels at 5 V supply. |
| 3-State Output Drive | ±6 mA (VOH/VOL @ VCC = 4.5 V) - sufficient to drive standard CMOS/TTL loads while maintaining noise margin. |
Pinout & Package
74HCT573DB,118 is supplied in SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Pin 1 index located at top-left corner; pin numbering follows standard counter-clockwise convention.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | 3-state output enable input | Active LOW control: drives all Q outputs to high-impedance when asserted; no effect on internal latch state. |
| 2–9 (D0–D7) | Data inputs | Asynchronous inputs feeding respective latch D terminals; accept TTL-level signals directly. |
| 10 (GND) | Ground reference | 0 V return path for all internal circuitry and output current sinks. |
| 11 (LE) | Latch enable input | Active HIGH: enables transparent mode (Q follows D); HIGH-to-LOW edge captures and holds D-state. |
| 12–19 (Q7–Q0) | 3-state latch outputs | Non-inverting outputs; reflect latched D values when OE = LOW and LE = LOW; tri-state when OE = HIGH. |
| 20 (VCC) | Positive supply | Primary power rail (4.5–5.5 V); powers internal logic and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Enables direct interface with legacy 5 V TTL microcontrollers and peripherals without level translation. |
| Shared latch & output control | Single LE and OE pins simplify PCB routing and reduce GPIO count in microprocessor I/O expansion designs. |
| Bus-oriented 3-state outputs | Allows multiple devices to share a common data bus; OE coordination prevents signal contention during read/write cycles. |
| Wide temperature qualification | Rated from -40 °C to +125 °C - suitable for industrial motor drives, PLC modules, and automotive under-hood non-safety ECUs. |
| Input clamp diodes | Permits safe overvoltage tolerance (e.g., 12 V sensor inputs) when used with series current-limiting resistors. |
Applications
| Microprocessor Address Latching | Industrial I/O Expansion |
|---|---|
Use Scenario: Holding multiplexed address/data bus signals (e.g., AD0–AD7 on 8051 or Z80) during memory access cycles. IC Role / Device Role / Timing Role: Acts as address latch: LE synchronized to ALE/WR to capture and hold address bits while data transfers occur. Use Value: Eliminates need for external address demultiplexing logic; ensures stable address presentation to memory chips during full bus cycle. | Use Scenario: Adding parallel digital I/O ports to programmable logic controllers handling sensor inputs and actuator outputs. IC Role / Device Role / Timing Role: Functions as bidirectional I/O port buffer: D inputs read sensors, Q outputs drive relays or LEDs via OE-controlled bus isolation. Use Value: Provides galvanic separation between controller bus and field-side circuits; OE enables hot-swap-safe port reconfiguration. |
| Legacy System Bus Interface | Test Equipment Signal Conditioning |
Use Scenario: Interfacing modern FPGA-based controllers to legacy ISA or PC/104 peripheral cards requiring 8-bit latched data paths. IC Role / Device Role / Timing Role: Serves as protocol translator: latches command bytes from FPGA and presents them synchronously to legacy device registers. Use Value: Bridges timing mismatch between fast FPGA clocks and slower legacy bus timing; LE timing aligns with ISA IOW/IOR strobes. | Use Scenario: Capturing and holding analog-to-digital converter (ADC) output words in automated test equipment before serial upload. IC Role / Device Role / Timing Role: Operates as sample-and-hold register: LE triggered by ADC EOC, Q outputs held steady for microcontroller read via shared data bus. Use Value: Prevents data corruption during multi-cycle bus reads; OE allows concurrent use of same bus for DAC or display updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transparent latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT373PW,118 | Identical logic function and pinout; TSSOP20 (SOT360-1) package - 4.4 mm body width, finer pitch (0.65 mm). | Requires PCB redesign for smaller footprint and reflow profile; better suited for space-constrained portable instrumentation. | Select when board area is constrained and thermal performance permits TSSOP mounting. |
| SN74HCT573N | DIP-20 through-hole package; identical electrical specs but larger form factor and higher parasitic inductance. | Used in prototyping, educational kits, or legacy repair where socketed DIP is required; not suitable for automated SMT production. | Choose only for hand-soldered prototypes or field-replacement scenarios demanding DIP compatibility. |
Compared with 74HCT573DB,118, the TSSOP alternative reduces board area but increases assembly complexity, while the DIP version sacrifices density and high-speed integrity for mechanical serviceability - selection hinges on production method, thermal budget, and layout constraints.
Availability
74HCT573DB,118 is available at Aetrix Electronics and suitable for industrial control systems, legacy microprocessor interfaces, and test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 74HCT573DB,118 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, analog, and discrete components for automotive, industrial, and consumer markets.
The 74HCT573 belongs to Nexperia's industry-standard logic family, engineered for robust interoperability with legacy TTL systems while delivering CMOS power efficiency and noise immunity in industrial environments.
FAQ
What is the difference between 74HCT573DB,118 and 74HC573DB,118?
The 74HCT573DB,118 uses TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at 5 V), enabling direct connection to 5 V TTL outputs. In contrast, the 74HC573DB,118 requires CMOS-level inputs (VIH ≥ 3.15 V at 5 V), making it incompatible with standard TTL without level shifting. Both share identical output characteristics and pinout.
Can 74HCT573DB,118 operate at 3.3 V supply?
No. The 74HCT573DB,118 is specified only for 4.5 V to 5.5 V operation per its recommended conditions. At 3.3 V, input thresholds fall outside guaranteed recognition range, and output drive strength degrades significantly. For 3.3 V systems, use 74LVC573A or 74ALVC573 instead.
How does the latch enable (LE) timing affect data capture reliability?
Data is captured on the HIGH-to-LOW transition of LE, requiring D inputs to be stable for at least 13 ns (tsu) before and 5 ns (th) after that edge at VCC = 4.5 V. Violating these setup/hold times risks metastability or incorrect latched values - proper synchronization with system clock edges or strobes is essential.
Is the SO20 package (SOT163-1) RoHS compliant and lead-free?
Yes. The 74HCT573DB,118 in SO20 packaging conforms to RoHS Directive 2011/65/EU and is lead-free, with matte tin (Sn) termination finish. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1, allowing unlimited floor life at ≤30 °C/60% RH.
74HCT573DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- D-Type Transparent Latch
- Circuit:
- 8:8
- Output Type:
- Tri-State
- Voltage - Supply:
- 4.5V ~ 5.5V
- Independent Circuits:
- 1
- Delay Time - Propagation:
- 17ns
- Current - Output High, Low:
- 6mA, 6mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74HCT573DB,118 FAQ
1.How can I place an order for 74HCT573DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT573DB,118 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 74HCT573DB,118 reliable?
The price and inventory of 74HCT573DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT573DB,118 is usually 5 days.
3.What payment methods are accepted for 74HCT573DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT573DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT573DB,118?
74HCT573DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT573DB,118 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 74HCT573DB,118?
For technical support, including 74HCT573DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT573DB,118 requirements.
6.How does Aetrix verify that 74HCT573DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT573DB,118 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 74HCT573DB,118 meets industry standards.
7.What is the process for return or replacement of 74HCT573DB,118?
All 74HCT573DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT573DB,118, 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 74HCT573DB,118 part is unused and in its original packaging.
Return procedure for 74HCT573DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT573DB,118 Tags
-
SN74HC573APWR
Texas Instruments
-
SN74HC573ADWR
Texas Instruments
-
SN74AHC573PWR
Texas Instruments
-
SN74HCT573DWR
Texas Instruments
-
SN74HC373N
Texas Instruments
-
SN74HC573AN
Texas Instruments
-
74VHC573MTCX
onsemi
-
MC74LCX573DTR2G
onsemi
-
74AUP1G373GW,125
Nexperia USA Inc.
-
SN74LVC1G373DCKR
Texas Instruments
-
SN74LVC1G373DBVR
Texas Instruments
-
NC7SZ373P6X
onsemi
Tech Hub
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…
