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Nexperia USA Inc. 74HCT244BQ,115
- Part No.:
- 74HCT244BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74HCT244BQ,115.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,881
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Product details
Overview
74HCT244BQ,115 from Nexperia is an octal non-inverting 3-state buffer/line driver with TTL-compatible inputs, dual independent output-enable controls (1OE, 2OE), 8-bit bus interface capability, and operation over -40 °C to +125 °C. It supports 5 V logic systems with 6 mA drive strength, 22 ns typical propagation delay at VCC = 4.5 V, and low-power CMOS design for industrial bus buffering.
For engineers reviewing the 74HCT244BQ,115 datasheet, 74HCT244BQ,115 pinout, 74HCT244BQ,115 application, or 74HCT244BQ,115 equivalent, key selection considerations include its TTL-level input compatibility, dual 4-bit enable control, DHVQFN20 thermal-enhanced package, 3-state output timing (15 ns enable/disable), and compliance with JEDEC JESD7A and JESD8C standards.
Technical Context
The 74HCT244BQ,115 implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated active-low output-enable input (1OE for Y0–Y3, 2OE for Y4–Y7). Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure direct interfacing with legacy 5 V logic families without level translation.
Internally, it uses standard CMOS silicon with input clamp diodes enabling safe overvoltage tolerance via external current-limiting resistors. The device operates within a strict 4.5–5.5 V supply range and delivers rail-to-rail output swing with guaranteed VOH ≥ 3.7 V and VOL ≤ 0.4 V under 6 mA load at VCC = 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL and mixed-signal systems; excludes 3.3 V operation. |
| Input Logic Type | TTL-level - VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V; eliminates need for external level shifters when driving from 74LS or microcontroller GPIOs. |
| Propagation Delay | 11 ns (typ) at VCC = 4.5 V, CL = 15 pF - Enables reliable 45 MHz bus operation in synchronous data transfer paths. |
| Output Drive | ±6 mA - Sufficient to drive 10 LSTTL loads or terminate short PCB traces without external buffers. |
| Enable/Disable Time | 15 ns (typ) - Supports fast bus arbitration and dynamic tri-state control in shared-data applications like memory-mapped I/O. |
| Operating Temperature | -40 °C to +125 °C - Qualified for extended industrial and under-hood automotive auxiliary circuits (non-automotive qualified per datasheet). |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Reduces risk of handling damage during manual assembly or rework. |
Pinout & Package
DHVQFN20 (SOT764-1) package: 2.5 × 4.5 × 0.85 mm body, 20-terminal no-lead quad flat design with exposed thermal pad (GND-connected recommended), optimized for high-density PCB layouts and improved thermal dissipation vs. SO20/TSSOP20.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enables for first and second 4-bit output groups; independent control allows time-multiplexed bus sharing. |
| 2, 4, 6, 8 | 1A0–1A3 | Inputs for first 4-bit buffer section; routed to outputs 1Y0–1Y3 when 1OE = LOW. |
| 18, 16, 14, 12 | 1Y0–1Y3 | Non-inverting 3-state outputs for first buffer group; high-impedance when 1OE = HIGH. |
| 17, 15, 13, 11 | 2A0–2A3 | Inputs for second 4-bit buffer section; routed to outputs 2Y0–2Y3 when 2OE = LOW. |
| 3, 5, 7, 9 | 2Y0–2Y3 | Non-inverting 3-state outputs for second buffer group; high-impedance when 2OE = HIGH. |
| 10 | GND | Ground reference (0 V); thermal pad underneath package is electrically GND and must be soldered or left floating per layout guidelines. |
| 20 | VCC | Positive supply (4.5–5.5 V); decoupling capacitor required within 5 mm for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit enables | Enables selective activation of two bus segments on single device - reduces component count in multi-peripheral interfaces. |
| TTL-compatible inputs | Accepts standard 5 V logic thresholds without pull-ups or level translators - simplifies integration with legacy controllers and FPGAs. |
| Low dynamic power | CPD = 35 pF per buffer - limits switching power to < 1 mW at 10 MHz, critical for thermally constrained embedded modules. |
| High noise immunity | Typical noise margin > 0.8 V at VCC = 5 V - maintains signal integrity in noisy industrial environments with motor drives or relays. |
| JEDEC-compliant packaging | SOT764-1 meets MO-241 mechanical standard - ensures compatibility with automated pick-and-place and reflow profiles. |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Bus Expansion |
|---|---|
Use Scenario: Isolating and driving address/data buses between CPU module and modular I/O cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus buffer with independent 4-bit enables synchronizing read/write cycles across multiple card slots. Use Value: Eliminates contention during hot-swap events via fast 15 ns disable time and prevents signal corruption with 0.4 V max VOL at full load. |
Use Scenario: Expanding GPIO count of 8-bit MCUs (e.g., ATmega328P) to drive parallel LCDs, keypad matrices, or LED arrays. IC Role / Device Role / Timing Role: Unidirectional level-shifting buffer translating MCU port pins to robust 6 mA bus drivers. Use Value: TTL input compatibility avoids external voltage dividers; 22 ns propagation delay preserves timing margins in 1–5 MHz peripheral interfaces. |
| Test Equipment Signal Routing | Automated Test Fixture Control |
Use Scenario: Multiplexing stimulus signals from DUT controller to multiple test points on PCB assemblies. IC Role / Device Role / Timing Role: 3-state switch matrix enabling one source to drive up to eight independent nodes sequentially. Use Value: Dual OE control allows glitch-free channel switching; thermal-enhanced DHVQFN20 sustains continuous operation at 85 °C ambient. |
Use Scenario: Controlling relay banks, solenoid drivers, or optocoupler inputs in production-line functional testers. IC Role / Device Role / Timing Role: High-noise-margin buffer isolating low-current MCU outputs from inductive load transients. Use Value: Input clamp diodes tolerate ±20 mA transient injection; latch-up immunity > 100 mA protects against ESD-induced resets. |
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 |
|---|---|---|---|
| 74HCT244PW,118 | TSSOP20 package (4.4 mm width); 10.0 mW/K thermal derating above 100 °C vs. 12.9 mW/K for BQ. | Lower profile but reduced thermal performance; suitable for space-constrained boards where heat dissipation is managed externally. | Select when footprint area is prioritized over sustained high-temperature operation. |
| SN74HCT244PWR | Texas Instruments variant; identical logic function but different AC specs - tpd = 19 ns (max) vs. 33 ns (max) for Nexperia at VCC = 4.5 V. | Marginally slower worst-case timing; may require timing slack verification in 20+ MHz designs. | Select only if TI's qualification documentation and long-term supply assurance meet program requirements. |
Compared with 74HCT244PW,118 and SN74HCT244PWR, the 74HCT244BQ,115 offers superior thermal management in compact layouts and tighter propagation delay distribution, making it preferred for high-reliability industrial bus interfaces where junction temperature stability and timing predictability are critical.
Availability
74HCT244BQ,115 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy MCU bus expansion, automated test fixture control, and signal routing applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT244BQ,115 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 focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions for industrial, automotive, and computing markets.
The 74HCT244BQ,115 belongs to Nexperia's industry-standard 74HCT logic family, engineered specifically for robust 5 V TTL-compatible interfacing in harsh industrial environments with guaranteed operation from -40 °C to +125 °C.
FAQ
Can the 74HCT244BQ,115 operate at 3.3 V?
No. The 74HCT244BQ,115 is specified only for 4.5–5.5 V supply operation per Table 5 of the datasheet. At 3.3 V, input thresholds fall outside TTL compatibility range and output drive degrades below specification - use 74LVC244A for 3.3 V systems.
Is the thermal pad on the DHVQFN20 package required to be soldered to ground?
The exposed thermal pad (terminal 1 index area) has no electrical requirement to be soldered, but Nexperia recommends connecting it to GND for optimal thermal performance and EMI reduction. If soldered, the land must remain floating or tied to GND - never left unconnected and ungrounded.
What is the maximum capacitive load the 74HCT244BQ,115 can drive reliably?
The device is characterized up to 50 pF load capacitance (Table 9), with propagation delay increasing to 33 ns (max) at CL = 50 pF and VCC = 4.5 V. For loads > 50 pF, add series termination or verify timing margins using the CPD = 35 pF parameter in dynamic power calculations.
Does the 74HCT244BQ,115 support hot insertion into a live bus?
It supports hot insertion only with proper system-level design: input clamp diodes allow current limiting via series resistors (per Section 1 General Description), but bus arbitration logic and slew-rate control must be implemented externally - the IC itself does not provide hot-swap sequencing or current limiting.
74HCT244BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 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-DHVQFN (4.5x2.5)
74HCT244BQ,115 FAQ
1.How can I place an order for 74HCT244BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT244BQ,115 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 74HCT244BQ,115 reliable?
The price and inventory of 74HCT244BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT244BQ,115 is usually 5 days.
3.What payment methods are accepted for 74HCT244BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT244BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT244BQ,115?
74HCT244BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT244BQ,115 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 74HCT244BQ,115?
For technical support, including 74HCT244BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT244BQ,115 requirements.
6.How does Aetrix verify that 74HCT244BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74HCT244BQ,115 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 74HCT244BQ,115 meets industry standards.
7.What is the process for return or replacement of 74HCT244BQ,115?
All 74HCT244BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT244BQ,115, 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 74HCT244BQ,115 part is unused and in its original packaging.
Return procedure for 74HCT244BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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