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Nexperia USA Inc. 74HC245DB,118
- Part No.:
- 74HC245DB,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HC245DB,118.pdf
- Description:
- IC TXRX NON-INVERT 6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,498
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Product details
Overview
74HC245DB,118 from Nexperia is an octal 3-state bidirectional bus transceiver with non-inverting outputs, direction control (DIR) and active-low output enable (OE), operating across 2.0 V to 6.0 V supply range, supporting TTL- and CMOS-level input compatibility depending on variant, and rated for -40 °C to +125 °C ambient temperature - used in microcontroller-to-peripheral data bus isolation and level translation in industrial control backplanes.
For engineers reviewing the 74HC245DB,118 datasheet, 74HC245DB,118 pinout, 74HC245DB,118 application, or 74HC245DB,118 equivalent, this device serves as a voltage-scalable, low-power bus interface IC requiring precise direction and tri-state control in mixed-voltage digital systems with strict noise immunity and ESD robustness requirements.
Technical Context
The 74HC245DB,118 implements dual 8-bit bidirectional data paths controlled by DIR and OE inputs: DIR selects A→B (A-side input, B-side output) or B→A (B-side input, A-side output); OE asserts high-impedance state on all outputs when HIGH. Its CMOS architecture ensures rail-to-rail output swing and sub-μA static current at VCC = 6.0 V.
Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors; static characteristics include VIH = 3.15 V (min) and VOL = 0.26 V (max) at IO = 6.0 mA and VCC = 4.5 V, while dynamic performance delivers tpd = 7 ns (typ) at VCC = 6.0 V and CL = 15 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports direct interface with 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay (tpd) | 7 ns (typ) at VCC = 6.0 V, CL = 15 pF - enables reliable operation in high-speed parallel bus systems up to ~70 MHz. |
| Output Drive Strength | ±6.0 mA (min) at VCC = 4.5 V - sufficient to drive standard 50 pF loads across PCB traces and multiple CMOS inputs. |
| Input Thresholds (VIH/VIL) | VIH = 3.15 V (min), VIL = 1.35 V (max) at VCC = 4.5 V - ensures clean switching margin against noise in industrial environments. |
| ESD Robustness | HBM > 2000 V, CDM > 1000 V - meets IEC 61000-4-2 Level 2 requirements for board-level handling and system integration. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood automotive modules, motor drives, and industrial PLC I/O stages. |
| Power Dissipation (Ptot) | 500 mW (SO20 package) - allows sustained operation at full speed without thermal derating below 109 °C ambient. |
Pinout & Package
74HC245DB,118 is supplied in SOT163-1 (SO20) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm lead pitch, JEDEC MS-013 compliant, with gull-wing leads and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | LOW enables A→B data flow; HIGH enables B→A - determines source/sink side of bidirectional bus interface. |
| 2–9 (A0–A7) | Port A Data Terminals | 8-bit bidirectional I/O pins connected to one bus segment (e.g., microcontroller data bus). |
| 10 (GND) | Ground Reference | Primary 0 V reference for all internal logic and output drivers; must be low-impedance connection. |
| 11–18 (B0–B7) | Port B Data Terminals | 8-bit bidirectional I/O pins connected to second bus segment (e.g., peripheral or memory bus). |
| 19 (OE) | Output Enable (Active LOW) | LOW enables outputs; HIGH forces all A/B pins into high-impedance state - essential for bus arbitration. |
| 20 (VCC) | Supply Voltage Input | Positive supply rail (2.0–6.0 V); decoupling capacitor (100 nF) required within 10 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2.0 V to 6.0 V operation enables drop-in use across legacy 5 V and modern 3.3 V systems without redesign. |
| Clamp Diode Protection | Integrated input clamp diodes allow safe overvoltage tolerance up to VCC + 0.5 V with external current limiting. |
| High Noise Immunity | Typical noise margin > 1.0 V at VCC = 4.5 V ensures stable operation in electrically noisy factory-floor environments. |
| Low Static Power | ICC ≤ 8.0 μA (typ) at VCC = 6.0 V - reduces quiescent power in always-on industrial monitoring nodes. |
| JEDEC Compliance | Fully compliant with JESD8C (2.7–3.6 V) and JESD7A (2.0–6.0 V) - guarantees interoperability with certified logic families. |
Applications
| Industrial Backplane Interface | Microcontroller Peripheral Expansion |
|---|---|
Use Scenario: Isolating MCU data bus from multi-drop sensor/actuator backplane with shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional bus buffer enabling time-multiplexed read/write cycles between host controller and remote I/O modules. Use Value: Prevents bus contention during simultaneous access attempts; 7 ns propagation delay maintains timing integrity at 20 MHz bus clock rates. |
Use Scenario: Extending GPIO count of ARM Cortex-M4 MCU via parallel-connected SPI peripherals with shared data lanes. IC Role / Device Role / Timing Role: Direction-controlled data path synchronizing burst transfers between processor and external SRAM or display controller. Use Value: Enables seamless 8-bit data handoff without software overhead; 3-state outputs eliminate need for external bus switches. |
| Legacy System Voltage Translation | Programmable Logic Interfacing |
Use Scenario: Interfacing 5 V FPGA configuration PROM to 3.3 V FPGA core using shared data/address bus. IC Role / Device Role / Timing Role: Level-shifting transceiver translating logic levels while preserving signal integrity and timing alignment. Use Value: Eliminates discrete resistor-divider networks; VIH/VIL thresholds ensure correct recognition of 3.3 V signals by 5 V PROM inputs. |
Use Scenario: Connecting CPLD-based glue logic to 8-bit microprocessor data bus with dynamic direction switching. IC Role / Device Role / Timing Role: Programmable-direction bus interface synchronized to CPU RD/WR strobes and address decode signals. Use Value: Supports real-time reconfiguration of data flow direction without interrupt latency; OE pin enables cycle-accurate bus release. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT245DB,118 | TTL-compatible inputs (VIH = 2.0 V min), identical pinout and function - requires 4.5–5.5 V supply only. | Better suited for legacy 5 V systems with TTL logic sources; not recommended for 3.3 V-only designs. | Select when interfacing to 74LS or other TTL-family devices where input threshold compatibility is critical. |
| SN74LVC245APWR | Lower VCC range (1.65–3.6 V), higher speed (tpd = 4.2 ns typ), but no input clamp diodes. | Optimized for battery-powered portable electronics; lacks overvoltage protection for mixed-voltage interfaces. | Prefer for ultra-low-voltage, high-speed applications where VCC ≤ 3.3 V and overvoltage risk is absent. |
Compared with 74HCT245DB,118 and SN74LVC245APWR, the 74HC245DB,118 uniquely balances wide voltage scalability (2.0–6.0 V), integrated overvoltage protection, and industrial temperature rating - making it the default choice for ruggedized mixed-supply bus bridging where reliability outweighs marginal speed gains.
Availability
74HC245DB,118 is available at Aetrix Electronics and suitable for industrial automation backplanes, programmable logic interconnects, and microcontroller peripheral expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC245DB,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 for automotive, industrial, and consumer markets - delivering robust, JEDEC-compliant components with rigorous quality control.
The 74HC245DB,118 belongs to Nexperia's 74HC logic family, designed specifically for scalable, low-power bus interfacing in harsh-environment applications where voltage flexibility, ESD resilience, and long-term supply stability are mandatory.
FAQ
What is the maximum clock frequency supported by the 74HC245DB,118 in a data bus application?
The 74HC245DB,118 does not operate on a clock signal - it is an asynchronous transceiver. Its usable data rate depends on propagation delay (7 ns typ at VCC = 6.0 V) and system setup/hold timing. For reliable operation with 15 pF load, maximum sustainable bus toggle rate is approximately 70 MHz, assuming clean edges and proper termination.
Can the 74HC245DB,118 safely interface a 5 V bus to a 3.3 V microcontroller without external level shifters?
Yes - when powered at 3.3 V, the 74HC245DB,118 accepts 5 V inputs safely due to its integrated input clamp diodes, provided current-limiting resistors (≥1 kΩ) are used on each A/B line. Outputs swing rail-to-rail (0–3.3 V), matching the MCU's input thresholds.
Is the 74HC245DB,118 pin-compatible with the 74LS245?
No - while both are octal transceivers, the 74LS245 uses different pin assignments (e.g., OE on pin 1, DIR on pin 2) and lacks input clamp diodes. The 74HC245DB,118 follows JEDEC-standard SO20 pinout (OE on pin 19, DIR on pin 1), requiring PCB layout revision for replacement.
Does the 74HC245DB,118 require pull-up or pull-down resistors on DIR or OE pins?
Not inherently - DIR and OE are CMOS inputs with ±0.1 μA leakage. However, OE should be actively driven (not left floating) to prevent unintended bus contention; a 10 kΩ pull-down on OE is common practice to ensure default high-impedance state at power-up.
74HC245DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 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
74HC245DB,118 FAQ
1.How can I place an order for 74HC245DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC245DB,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 74HC245DB,118 reliable?
The price and inventory of 74HC245DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC245DB,118 is usually 5 days.
3.What payment methods are accepted for 74HC245DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC245DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC245DB,118?
74HC245DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC245DB,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 74HC245DB,118?
For technical support, including 74HC245DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC245DB,118 requirements.
6.How does Aetrix verify that 74HC245DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HC245DB,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 74HC245DB,118 meets industry standards.
7.What is the process for return or replacement of 74HC245DB,118?
All 74HC245DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC245DB,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 74HC245DB,118 part is unused and in its original packaging.
Return procedure for 74HC245DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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