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NXP Semiconductors 74HCT245DB,118
- Part No.:
- 74HCT245DB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT245DB,118.pdf
- Description:
- IC TRANSCVR TRI-ST 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,135
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Product details
Overview
74HCT245DB,118 from Nexperia is an octal 3-state bidirectional bus transceiver with TTL-compatible inputs and non-inverting outputs, operating from 4.5 V to 5.5 V supply. It features independent direction (DIR) and active-low output enable (OE) controls, supports ±6 mA drive strength at VCC = 4.5 V, and delivers propagation delay as low as 10 ns (typical) under 15 pF load. It is used in microcontroller-to-peripheral data bus isolation and level-shifting interfaces in industrial control modules.
For engineers reviewing the 74HCT245DB,118 datasheet, 74HCT245DB,118 pinout, 74HCT245DB,118 application, or 74HCT245DB,118 equivalent, this device serves as a robust, temperature-stable (−40 °C to +125 °C), JEDEC-compliant bus interface for legacy TTL-compatible systems requiring controlled bidirectional data flow and high-impedance bus release.
Technical Context
The 74HCT245DB,118 implements a dual-rail 8-bit transceiver architecture with separate A-side and B-side I/O banks, where DIR selects data flow direction (A→B or B→A) and OE disables all outputs to high-impedance state. Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure compatibility with standard 5 V logic families.
It uses CMOS silicon with integrated input clamp diodes enabling safe interfacing to voltages exceeding VCC when current-limiting resistors are applied. The device exhibits latch-up immunity >100 mA per JESD78 Class II Level B and ESD robustness (HBM >2000 V, CDM >1000 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - Ensures stable operation in standard 5 V TTL/CMOS mixed-signal systems without rail translation. |
| Propagation delay | 10 ns (typ) at VCC = 5 V, CL = 15 pF - Enables reliable 50 MHz bus handshaking in synchronous peripheral interfaces. |
| Output drive | ±6 mA at VOH/VOL - Sufficient to drive 10 LSTTL loads or 20 CMOS inputs while maintaining valid logic levels. |
| Input threshold | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees noise-immune recognition of standard 5 V TTL signals across full temperature range. |
| Operating temperature | −40 °C to +125 °C - Qualified for under-hood industrial and extended-temperature embedded applications. |
| Power dissipation | 160 μA ICC (max) at 125 °C - Supports low-static-power system design in thermally constrained enclosures. |
| ESD rating | HBM >2000 V, CDM >1000 V - Reduces need for external protection in board-level ESD-prone environments. |
Pinout & Package
74HCT245DB,118 is supplied in SOT339-1 (SSOP20) package: plastic shrink small outline package, 20 leads, body width 5.3 mm, 0.65 mm pitch. Pin 1 index located at top-left corner with notch marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | LOW enables A→B data flow; HIGH enables B→A - critical for half-duplex bus arbitration in shared-memory systems. |
| 2–9 (A0–A7) | A-side bidirectional I/O | Connects to microcontroller or master bus; clamped inputs allow safe overvoltage tolerance with series resistors. |
| 10 (GND) | Ground reference | Primary return path for all internal logic and I/O currents; must be low-inductance connection to minimize ground bounce. |
| 11–18 (B0–B7) | B-side bidirectional I/O | Interfaces to peripheral or slave device; identical electrical characteristics to A-side for symmetrical bus loading. |
| 19 (OE) | Active-low output enable | Drives all outputs to high-Z when HIGH - essential for multi-master bus contention avoidance and power-down sequencing. |
| 20 (VCC) | Positive supply | Must be decoupled with ≥100 nF ceramic capacitor near pin to suppress switching noise during bus transitions. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible input levels | Enables direct connection to legacy 5 V microcontrollers and peripherals without level shifters. |
| 3-state bidirectional control | Independent DIR and OE pins allow precise timing of bus ownership transfer and idle-state isolation. |
| Clamp diode protected inputs | Permits safe interface to signals up to VCC + 0.5 V using external current-limiting resistors. |
| High noise immunity | Input hysteresis and CMOS design achieve >400 mV noise margin at VCC = 5 V across full temperature range. |
| JEDEC-compliant packaging | SOT339-1 footprint matches industry-standard SSOP20 layout, ensuring drop-in PCB compatibility. |
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 bus buffer managing time-multiplexed AD bus between ARM Cortex-M4 and discrete DAC/ADC modules. Use Value: Prevents bus contention during card hot-swap; 10 ns propagation delay ensures setup/hold compliance with 20 MHz bus clock. |
Use Scenario: Extending 8-bit data bus of 8051-based motor controller to add external SRAM and display driver. IC Role / Device Role / Timing Role: Direction-controlled transceiver synchronizing read/write cycles between MCU and memory-mapped peripherals. Use Value: TTL-level inputs eliminate need for external level translators; ±6 mA drive supports 15 cm trace lengths on 4-layer PCB. |
| Automated Test Equipment (ATE) Signal Routing | Industrial HMI Communication Bridge |
Use Scenario: Multiplexing test signals between DUT interface board and FPGA-based pattern generator. IC Role / Device Role / Timing Role: High-impedance isolation switch enabling dynamic reconfiguration of signal paths during test sequence execution. Use Value: 160 μA max ICC at 125 °C reduces thermal load in densely packed ATE chassis; OE-controlled disable ensures clean signal isolation. |
Use Scenario: Bridging RS-485 transceiver bus to local LCD controller in factory-floor human-machine interface panel. IC Role / Device Role / Timing Role: Data direction manager translating command/response packets between isolated communication layer and local display subsystem. Use Value: −40 °C to +125 °C rating ensures reliability in uncontrolled ambient environments; clamp diodes protect against induced transients on long cable runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT245PW,118 | TSSOP20 (SOT360-1) package; 4.4 mm body width; identical electrical specs. | Smaller footprint and lower profile - preferred for space-constrained PCBs with fine-pitch routing. | Select when board area is limited and reflow compatibility with TSSOP is confirmed. |
| SN74HCT245PWR | Texas Instruments part; same logic function, but VIH/VIL thresholds differ slightly (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V–5.5 V); higher ICC (200 μA max at 125 °C). | Valid for pin-compatible replacement only if system-level noise margin and power budget accommodate TI's higher leakage. | Use only after validating static current draw and input threshold margins in final design. |
Compared with 74HCT245PW,118, the 74HCT245DB,118 offers identical logic performance in a wider SSOP package better suited for manual inspection and wave soldering; versus SN74HCT245PWR, it provides tighter ICC control and consistent Nexperia qualification for extended-temperature industrial use.
Availability
74HCT245DB,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microcontroller bus expansion, automated test equipment signal routing, and industrial HMI communication bridges requiring stable component supply across extended temperature ranges.
Supply support for 74HCT245DB,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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The 74HCT245DB,118 belongs to Nexperia's 74HCT logic family-designed specifically for robust 5 V TTL-compatible interfacing in industrial and extended-temperature applications where noise immunity and bus integrity are critical.
FAQ
Can 74HCT245DB,118 operate at 3.3 V supply?
No. The 74HCT245DB,118 is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH = 2.0 V min) become non-compliant with standard 3.3 V logic, and output drive falls outside guaranteed specifications. Use 74LVC245 or 74ALVC245 for 3.3 V systems.
What is the maximum capacitive load the outputs can drive reliably?
The device is characterized up to 50 pF load capacitance per output (per Table 9 test conditions). For reliable timing at full speed, keep total load ≤15 pF per line-including trace, via, and input capacitance of downstream devices-to maintain 10 ns propagation delay and <18 ns transition time.
Is the GND pin (pin 10) internally connected to the exposed pad in SOT339-1?
No. The SOT339-1 package does not include an exposed thermal pad. Pin 10 is the sole GND terminal, and no internal connection exists to any auxiliary thermal structure. PCB layout must provide adequate copper pour connected solely to pin 10.
How does OE assertion affect power consumption during bus idle periods?
When OE is HIGH (disabled), ICC drops to ≤160 μA maximum at 125 °C-less than 0.1% of active-mode current. This enables ultra-low quiescent power in standby states, making the device suitable for battery-backed or energy-sensitive industrial control nodes.
74HCT245DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- 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
74HCT245DB,118 FAQ
1.How can I place an order for 74HCT245DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT245DB,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 74HCT245DB,118 reliable?
The price and inventory of 74HCT245DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT245DB,118 is usually 5 days.
3.What payment methods are accepted for 74HCT245DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT245DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT245DB,118?
74HCT245DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT245DB,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 74HCT245DB,118?
For technical support, including 74HCT245DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT245DB,118 requirements.
6.How does Aetrix verify that 74HCT245DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT245DB,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 74HCT245DB,118 meets industry standards.
7.What is the process for return or replacement of 74HCT245DB,118?
All 74HCT245DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT245DB,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 74HCT245DB,118 part is unused and in its original packaging.
Return procedure for 74HCT245DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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