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Nexperia USA Inc. 74HCT244DB,118
- Part No.:
- 74HCT244DB,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT244DB,118.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,926
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Product details
Overview
74HCT244DB,118 from Nexperia is an octal non-inverting 3-state buffer/line driver with TTL-compatible inputs and two independent output-enable controls (1OE, 2OE), each managing four outputs. It operates at 4.5 V to 5.5 V, delivers ±6 mA output drive, exhibits 11 ns typical propagation delay at 4.5 V, and supports industrial temperature range (−40 °C to +125 °C). It is used in bidirectional bus interfacing between microcontrollers and peripheral I/O expanders.
For engineers reviewing the 74HCT244DB,118 datasheet, 74HCT244DB,118 pinout, 74HCT244DB,118 application, or 74HCT244DB,118 equivalent, key selection criteria include TTL-level input compatibility, dual 4-bit 3-state control, SO20 package footprint, guaranteed 125 °C operation, and low static current (≤160 μA).
Technical Context
The device implements two independent 4-bit non-inverting buffers, each gated by a dedicated active-low output-enable input (1OE for Y0–Y3, 2OE for Y4–Y7). Inputs accept standard TTL voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), ensuring direct compatibility with legacy 5 V logic families without level translation.
Each output drives up to ±6 mA while maintaining VOH ≥ 3.7 V and VOL ≤ 0.4 V under load, and transitions exhibit 5 ns typical rise/fall time (tr/tf) into 15 pF. The 3-state disable timing (ten/tdis) is 15–45 ns across temperature, enabling clean bus arbitration in multiplexed data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible input thresholds, CMOS output drive |
| Supply Voltage Range | 4.5 V to 5.5 V - Matches standard 5 V systems with 10% tolerance margin |
| Propagation Delay (tpd) | 11 ns typ @ VCC = 4.5 V, CL = 15 pF - Enables ≤45 MHz bus operation |
| Output Drive Strength | ±6 mA @ VOH/VOL - Sufficient to drive 50 Ω transmission lines or 10 LSTTL loads |
| Operating Temperature | −40 °C to +125 °C - Qualified for extended industrial and under-hood applications |
| Input Clamping Diodes | Integrated - Allows safe interface to voltages exceeding VCC when used with current-limiting resistors |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Robust handling during PCB assembly and system integration |
Pinout & Package
74HCT244DB,118 is supplied in SO20 (SOT163-1) package: plastic small outline, 20 leads, 7.5 mm body width, 1.27 mm lead pitch. Pin 1 is index-marked; pin 10 is GND; pin 20 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enable inputs - Independently control high-impedance state of first/second 4-bit output group |
| 2, 4, 6, 8 | 1A0–1A3 | Data inputs for first buffer section - Directly connected to upstream source (e.g., MCU port) |
| 3, 5, 7, 9 | 2Y0–2Y3 | Outputs for second buffer section - Drive downstream bus segment or peripheral address/data lines |
| 10 | GND | Reference ground - Must be low-impedance connection to system common return |
| 11, 13, 15, 17 | 2A0–2A3 | Data inputs for second buffer section - Accept signals from alternate controller or shared bus |
| 12, 14, 16, 18 | 1Y0–1Y3 | Outputs for first buffer section - Provide isolated, driven outputs to memory or I/O devices |
| 20 | VCC | Positive supply - Decoupling capacitor (100 nF ceramic) required within 5 mm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit 3-state control | Enables selective isolation of two bus segments without external logic or timing coordination |
| TTL-compatible input thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V at 5 V - Eliminates need for level shifters when interfacing 74LS/ALS families |
| High noise immunity | Typical noise margin > 0.8 V at VCC = 5 V - Resists coupling from adjacent switching traces or power rail ripple |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II Level B - Prevents destructive latch-up during transient overvoltage events |
| Wide ambient temperature range | −40 °C to +125 °C - Validated operation across full industrial thermal envelope without derating |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Bus Expansion |
|---|---|
Use Scenario: Isolating CPU address/data bus from modular I/O cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional buffer enabling time-multiplexed access to multiple card slots via shared backplane wiring. Use Value: Dual OE pins allow staggered enable timing to prevent bus contention during hot-swap insertion; 125 °C rating supports convection-cooled enclosures. |
Use Scenario: Extending GPIO count of 8-bit MCUs (e.g., ATmega328P) to drive LED arrays, keypad scanners, or sensor multiplexers. IC Role / Device Role / Timing Role: Unidirectional output driver translating MCU port pins to higher-current, noise-immune bus signals. Use Value: TTL input compatibility ensures direct connection to MCU outputs without pull-ups; ±6 mA drive sustains 20 mA per LED with series resistor. |
| Automotive Body Control Module | Test Equipment Signal Conditioning |
Use Scenario: Interfacing microcontroller I/O to relay drivers and sensor inputs in non-safety-critical vehicle subsystems. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer for 5 V CAN/LIN peripheral interfaces. Use Value: −40 °C to +125 °C qualification meets AEC-Q100 Grade 2 requirements; integrated clamp diodes simplify ESD protection design. |
Use Scenario: Driving multiple DUT inputs simultaneously from a single pattern generator channel in automated test fixtures. IC Role / Device Role / Timing Role: Fan-out buffer replicating stimulus signals with matched edge rates and minimal skew. Use Value: 11 ns tpd and 5 ns tr/tf ensure <1 ns inter-output skew across all eight channels; SO20 footprint simplifies fixture layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT244N | DIP-20 package; no thermal pad; wider body (6.35 mm); identical electrical specs | Suitable for through-hole prototyping or legacy board rework where SO20 reflow is unavailable | Select when manual soldering or socket-based validation is required; avoid for high-density or thermally constrained layouts |
| 74HCT244PW,118 | TSSOP-20 package (SOT360-1); 4.4 mm body width; same pinout; 10% lower thermal resistance | Better suited for space-constrained PCBs and improved thermal performance in continuous drive scenarios | Prefer for new designs targeting miniaturization or >50% duty-cycle output loading; requires fine-pitch reflow capability |
Compared with SN74HCT244N and 74HCT244PW,118, the 74HCT244DB,118 offers optimal balance of manufacturability (SO20 reflow compatibility), thermal robustness (SO20's 12.3 mW/K derating above 109 °C), and legacy footprint support - making it ideal for volume industrial production where reliability and process maturity are prioritized.
Availability
74HCT244DB,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, legacy MCU bus expansion, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT244DB,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, discrete, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume applications.
The 74HCT244DB,118 belongs to Nexperia's 74HCT logic family - engineered specifically for seamless interoperability with legacy TTL systems while leveraging modern CMOS process advantages in power and speed.
FAQ
What is the maximum clock frequency supported by the 74HCT244DB,118?
The 74HCT244DB,118 is not a clocked device and has no internal clock; its usable signal frequency depends on propagation delay and load. With 11 ns typical tpd and 5 ns transition time into 15 pF, it reliably supports data rates up to 45 MHz in point-to-point bus configurations, assuming proper termination and layout.
Can 74HCT244DB,118 drive a 50 Ω transmission line directly?
Yes - its ±6 mA output drive into 50 Ω yields ~300 mV swing, sufficient for short-line signaling. For full 3.3 V or 5 V logic-level transmission, use series termination (e.g., 33 Ω at driver) to match characteristic impedance and suppress reflections without exceeding VOH/VOL limits.
Is the 74HCT244DB,118 qualified for automotive applications?
No - it is specified for industrial temperature range (−40 °C to +125 °C) but is not AEC-Q100 qualified. Nexperia explicitly states non-automotive qualification in its legal disclaimers; use only in non-safety-critical automotive subsystems with customer-assumed risk and additional validation.
How does the input clamping diode affect interfacing with voltages above VCC?
The integrated input clamp diodes allow safe connection to voltages up to VCC + 0.5 V when used with a series current-limiting resistor. For example, with VCC = 5 V and a 1 kΩ resistor, a 12 V input injects ≤7 mA into the diode - within the ±20 mA absolute maximum rating and avoiding damage.
74HCT244DB,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:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74HCT244DB,118 FAQ
1.How can I place an order for 74HCT244DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT244DB,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 74HCT244DB,118 reliable?
The price and inventory of 74HCT244DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT244DB,118 is usually 5 days.
3.What payment methods are accepted for 74HCT244DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT244DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT244DB,118?
74HCT244DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT244DB,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 74HCT244DB,118?
For technical support, including 74HCT244DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT244DB,118 requirements.
6.How does Aetrix verify that 74HCT244DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT244DB,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 74HCT244DB,118 meets industry standards.
7.What is the process for return or replacement of 74HCT244DB,118?
All 74HCT244DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT244DB,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 74HCT244DB,118 part is unused and in its original packaging.
Return procedure for 74HCT244DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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