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NXP Semiconductors 74HC244DB,118
- Part No.:
- 74HC244DB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HC244DB,118.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,858
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Product details
Overview
74HC244DB,118 from Nexperia is an octal non-inverting 3-state buffer/line driver in SO20 (SOT163-1) package, designed for bidirectional bus interfacing and signal isolation in digital systems. It features dual independent 4-bit sections (1A0–1A3/1Y0–1Y3 and 2A0–2A3/2Y0–2Y3), two active-low output enables (1OE, 2OE), CMOS-level input compatibility, and operates from 2.0 V to 6.0 V supply. Used in industrial control backplanes and microcontroller I/O expansion.
For engineers reviewing the 74HC244DB,118 datasheet, 74HC244DB,118 pinout, 74HC244DB,118 application, or 74HC244DB,118 equivalent, key selection factors include propagation delay at 4.5 V (11 ns typ), 3-state enable/disable timing (13–15 ns), output drive strength (±7.8 mA), wide VCC range (2.0–6.0 V), and SO20 thermal performance up to +125 °C.
Technical Context
This device implements two independent 4-bit non-inverting buffers with high-impedance 3-state outputs controlled by separate active-low enables (1OE, 2OE). Each section isolates its four inputs (e.g., 1A0–1A3) from its corresponding outputs (1Y0–1Y3) when enabled, and presents near-infinite impedance when disabled.
Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Static characteristics confirm CMOS-compatible VIH/VIL thresholds (e.g., VIH = 3.15 V min at VCC = 4.5 V), while dynamic specs guarantee tpd ≤ 22 ns max over full temperature range (−40 °C to +125 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-powered logic |
| tpd (VCC = 4.5 V) | 11 ns typical - enables reliable operation in 45 MHz bus systems with 15 pF load |
| IO (High Drive) | −7.8 mA at VOH ≥ 3.98 V - sufficient to drive four standard TTL loads or 15 pF transmission lines |
| ten / tdis | 13–15 ns max - ensures fast bus arbitration and clean signal gating during state transitions |
| Operating Temp | −40 °C to +125 °C - qualified for industrial and extended-temperature embedded applications |
| ESD Rating | HBM > 2000 V - provides robust handling in automated assembly and field-replaceable modules |
| Power Dissipation | 500 mW max (SO20) - allows sustained operation without forced cooling in dense PCB layouts |
Pinout & Package
74HC244DB,118 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Thermal resistance θJA = 109 °C/W (typical), Ptot derates linearly at 12.3 mW/K above 109 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls first/second 4-bit section independently |
| 2, 4, 6, 8 | 1A0–1A3 | Data inputs for first buffer group; CMOS-level compatible |
| 18, 16, 14, 12 | 1Y0–1Y3 | Non-inverting 3-state outputs for first group; high-Z when OE = HIGH |
| 17, 15, 13, 11 | 2A0–2A3 | Data inputs for second buffer group; electrically isolated from first group |
| 3, 5, 7, 9 | 2Y0–2Y3 | Non-inverting 3-state outputs for second group; driven only when 2OE = LOW |
| 10 | GND | Reference ground plane for all internal logic and output stages |
| 20 | VCC | Primary power rail; supplies all internal circuitry and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range | 2.0 V to 6.0 V - eliminates need for level shifters between 3.3 V and 5 V subsystems |
| Independent 4-bit control | Dual OE pins (1OE/2OE) - enables selective activation of half-bus segments for power-aware data routing |
| Clamp diode inputs | Integrated input clamps - permits direct connection to overvoltage sources (e.g., 12 V sensors) with series resistors |
| High noise immunity | Typical VIH − VIL = 2.0 V at VCC = 4.5 V - rejects >1 V of coupled noise on shared PCB traces |
| Latch-up immunity | JESD78 Class II Level B (>100 mA) - prevents destructive latch-up during transient overvoltage events |
Applications
| Industrial PLC Backplane | Microcontroller I/O Expansion |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from modular I/O cards in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: Bidirectional buffer enabling hot-swap-safe communication between main controller and peripheral modules via shared parallel bus. Use Value: Dual OE control allows per-module enable/disable without resetting entire bus; 125 °C rating supports convection-cooled enclosures. |
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU for driving LED arrays and reading rotary encoders. IC Role / Device Role / Timing Role: Non-inverting 3-state driver translating MCU logic levels to higher-current bus signals while preventing contention. Use Value: ±7.8 mA drive supports direct LED sinking; low 11 ns tpd preserves timing margins in 20 MHz SPI-like parallel interfaces. |
| Legacy Bus Interface Adapter | Test Fixture Signal Conditioning |
|
Use Scenario: Bridging modern FPGA-based test equipment to legacy 8-bit ISA or PC/104 peripherals. IC Role / Device Role / Timing Role: Voltage-tolerant buffer matching 3.3 V FPGA I/O to 5 V legacy bus signaling standards. Use Value: 2.0–6.0 V VCC range and CMOS input thresholds ensure interoperability across mixed-voltage test environments. |
Use Scenario: Isolating DUT signals from automated test equipment during functional validation of PCB assemblies. IC Role / Device Role / Timing Role: 3-state gate controlling signal flow direction between tester channel and device under test. Use Value: Fast 13 ns enable/disable time synchronizes with pattern generator strobes; HBM >2000 V protects against ESD during probe contact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT244DB,118 | TTL-compatible inputs (VIH = 2.0 V min); identical pinout and timing | Better suited for interfacing with legacy 5 V TTL logic families | Select when driving from 5 V microcontrollers or older logic with marginal CMOS thresholds |
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V); 3.6 V tolerant inputs; 24 mA drive | Optimized for 3.3 V-only systems with higher fanout requirements | Choose for modern low-voltage designs requiring higher output current and smaller TSSOP package |
Compared with 74HC244DB,118, the 74HCT244DB,118 offers improved compatibility with TTL source logic but sacrifices some noise margin, while SN74LVC244APWR delivers higher drive and lower voltage operation at the cost of reduced VCC flexibility and no 5 V tolerance.
Availability
74HC244DB,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller I/O expansion, and legacy bus interface adapters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC244DB,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 delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial and automotive applications.
The 74HC244DB,118 belongs to Nexperia's HC-series logic family, engineered for low-power, high-noise-immunity digital interfacing in harsh environments where wide VCC range and extended temperature operation are critical.
FAQ
What is the maximum clock frequency supported by 74HC244DB,118?
The 74HC244DB,118 is not a clocked device-it has no internal clock and functions as a combinatorial buffer. Its usable data rate depends on propagation delay (11 ns typ at 4.5 V) and load capacitance. With 15 pF load, it reliably supports bus toggle rates up to ~45 MHz, assuming setup/hold timing is managed externally by the driving controller.
Can 74HC244DB,118 drive LEDs directly?
Yes-each output can sink or source up to ±7.8 mA at VCC = 4.5 V while maintaining VOH ≥ 3.98 V and VOL ≤ 0.26 V. This is sufficient to drive standard 2 mA indicator LEDs with appropriate current-limiting resistors. For higher-current LEDs, external transistors or dedicated drivers are recommended.
Is 74HC244DB,118 pin-compatible with 74LS244?
No-74HC244DB,118 uses SO20 (SOT163-1) packaging with 1.27 mm pitch, while standard 74LS244 typically uses DIP-20 or SOIC-20 with different pin assignments (e.g., GND at Pin 10 vs. Pin 10 in HC version). Electrical compatibility also differs: LS logic draws higher quiescent current and has different VIH/VIL thresholds.
Does 74HC244DB,118 require pull-up or pull-down resistors on unused inputs?
Unused inputs must be terminated to a valid logic level (VCC or GND) to prevent floating nodes that cause increased ICC, noise susceptibility, or erratic output behavior. Nexperia recommends connecting unconnected inputs directly to VCC or GND-not through resistors-unless current limiting is required for overvoltage protection via the internal clamp diodes.
74HC244DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74HC244DB,118 FAQ
1.How can I place an order for 74HC244DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC244DB,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 74HC244DB,118 reliable?
The price and inventory of 74HC244DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC244DB,118 is usually 5 days.
3.What payment methods are accepted for 74HC244DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC244DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC244DB,118?
74HC244DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC244DB,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 74HC244DB,118?
For technical support, including 74HC244DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC244DB,118 requirements.
6.How does Aetrix verify that 74HC244DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HC244DB,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 74HC244DB,118 meets industry standards.
7.What is the process for return or replacement of 74HC244DB,118?
All 74HC244DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC244DB,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 74HC244DB,118 part is unused and in its original packaging.
Return procedure for 74HC244DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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