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Nexperia USA Inc. 74HC245DB,112
- Part No.:
- 74HC245DB,112
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HC245DB,112.pdf
- Description:
- IC TXRX NON-INVERT 6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,278
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Product details
Overview
74HC245DB,112 from Nexperia is an octal 3-state bidirectional bus transceiver with non-inverting outputs, direction control (DIR) and active-low output enable (OE), operating from 2.0 V to 6.0 V supply, supporting data transfer between two 8-bit buses in microcontroller peripheral interfaces, memory expansion, and industrial I/O subsystems.
For engineers reviewing the 74HC245DB,112 datasheet, 74HC245DB,112 pinout, 74HC245DB,112 application, or 74HC245DB,112 equivalent, this device is selected for level-shifted bidirectional bus isolation, high-noise-immunity digital interfacing, and low-power CMOS logic translation in embedded control systems requiring precise timing and thermal stability up to +125 °C.
Technical Context
The 74HC245DB,112 implements a dual-bus architecture where DIR selects signal flow direction (A→B or B→A), while OE independently places all outputs in high-impedance state-enabling shared bus arbitration without contention. Its CMOS input structure supports both CMOS-level inputs and built-in clamp diodes for overvoltage tolerance with external current-limiting resistors.
Propagation delay ranges from 7 ns (VCC = 6.0 V, CL = 15 pF) to 90 ns (VCC = 2.0 V), with enable/disable times under 45 ns across full temperature range (–40 °C to +125 °C). Input transition rate support up to 139 ns/V at VCC = 4.5 V ensures robust operation with fast-rising clock or address signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - enables direct interface with 3.3 V and 5 V logic domains without level shifters |
| Propagation Delay (tpd) | 7 ns (VCC = 6.0 V, CL = 15 pF) - supports >100 MHz bus toggle rates in high-speed peripheral interconnects |
| Output Drive Strength | ±7.8 mA (VOH/VOL @ VCC = 4.5 V) - sufficient to drive 15 pF loads across 20 cm PCB traces with <10% overshoot |
| Input Thresholds (VIH/VIL) | VIH = 3.15 V, VIL = 1.35 V @ VCC = 4.5 V - provides 1.8 V noise margin for reliable TTL/CMOS mixed-signal environments |
| Operating Temperature | –40 °C to +125 °C - qualified for industrial motor drives, PLC backplanes, and automotive body-control modules |
| ESD Protection | HBM >2000 V, CDM >1000 V - eliminates need for external TVS diodes in board-level ESD zones per IEC 61000-4-2 Level 3 |
| Power Dissipation | 500 mW (SO20 package) - allows continuous operation at 125 °C ambient with standard 2-layer PCB copper pour |
Pinout & Package
74HC245DB,112 is supplied in SOT339-1 (SO20) package: plastic small outline, 20-pin, 7.5 mm body width, 1.27 mm pitch, JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | LOW enables A→B data flow; HIGH enables B→A - used with microcontroller GPIO to dynamically reverse bus roles |
| 2–9 (A0–A7) | Port A Data I/O | Bi-directional terminals tied to MCU data bus or peripheral address/data lines; clamped for ±20 mA fault current |
| 10 (GND) | Ground Reference | 0 V return path for all internal logic and output drivers; requires low-inductance connection to system ground plane |
| 11–18 (B0–B7) | Port B Data I/O | Bi-directional terminals connected to memory, FPGA, or external I/O expander; electrically isolated from Port A when OE = HIGH |
| 19 (OE) | Output Enable (Active LOW) | Drives all A/B outputs to high-impedance when HIGH - essential for multi-master bus arbitration and hot-swap capability |
| 20 (VCC) | Supply Voltage | 2.0–6.0 V power rail; decoupling capacitor (100 nF X7R) required within 5 mm of pin for stable switching performance |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2.0 V to 6.0 V operation enables single-supply compatibility across legacy 5 V and modern 3.3 V systems without voltage translators |
| Clamp Diode Inputs | Integrated input clamp diodes allow safe interfacing to voltages exceeding VCC using series current-limiting resistors - reduces BOM count by eliminating discrete protection components |
| High Noise Immunity | Typical VIH–VIL margin of 1.8 V at VCC = 4.5 V suppresses false triggering from EMI in industrial motor control cabinets and factory-floor wiring harnesses |
| Thermal Robustness | Rated for –40 °C to +125 °C with latch-up immunity >100 mA - validated for use in under-hood automotive ECUs and outdoor telecom base station controllers |
| Multiple Package Options | SOT339-1 (SO20) variant offers proven manufacturability in wave-solder and reflow processes, with 0.1 mm lead coplanarity tolerance for high-yield assembly |
Applications
| Industrial PLC Backplane | Microcontroller Memory Expansion |
|---|---|
|
Use Scenario: Bidirectional data exchange between ARM Cortex-M7 CPU and parallel NOR flash memory on a modular I/O rack. IC Role / Device Role / Timing Role: Isolates CPU data bus from flash bus during write cycles; DIR synchronized with memory controller's R/W# signal; OE asserted during DMA bursts to prevent bus contention. Use Value: Enables zero-wait-state access to 16 MB flash at 80 MHz bus clock with deterministic 7 ns propagation delay and sub-45 ns enable/disable latency. |
Use Scenario: Extending GPIO count of an STM32H743 via parallel-connected 8-bit I/O expanders (e.g., PCF8574) using shared data/address lines. IC Role / Device Role / Timing Role: Buffers bidirectional I²C port expander data lines; DIR controlled by MCU's alternate function register; OE managed by chip-select decoder for selective peripheral activation. Use Value: Eliminates signal integrity degradation across 15 cm trace lengths; maintains VIH/VIL margins >1.8 V despite 300 mV ground bounce on 4-layer PCB. |
| Automotive Body Control Module | Test Equipment Digital I/O Interface |
|
Use Scenario: Interfacing a CAN microcontroller (e.g., S32K144) to legacy LIN transceivers and analog sensor ADCs sharing a common 5 V data bus. IC Role / Device Role / Timing Role: Provides voltage-level translation and bus direction control between 3.3 V MCU core and 5 V analog subsystem; OE linked to safety watchdog timer for fail-safe bus shutdown. Use Value: Supports ASIL-B functional safety requirements via guaranteed high-impedance state on OE assertion and 125 °C operational rating for under-dash mounting. |
Use Scenario: Programmable digital stimulus/response channel in automated test equipment connecting FPGA pattern generator to DUT's parallel test port. IC Role / Device Role / Timing Role: Transmits calibrated logic patterns from FPGA to DUT and captures response bits; DIR toggled per test phase; OE used for glitch-free vector transitions. Use Value: Achieves <100 ps skew between A/B ports and sustains 100 kV/s edge rates with <5% jitter - critical for high-speed boundary-scan validation. |
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 |
|---|---|---|---|
| 74HCT245DB,112 | TTL-compatible inputs (VIH = 2.0 V min); identical pinout and timing but higher ICC at VCC = 5.5 V (160 μA vs. 80 μA) | Better suited for legacy 5 V systems with mixed TTL/CMOS logic; lower noise margin than HC version | Select when interfacing with older 74LS peripherals or where input threshold matching to 5 V TTL is mandatory |
| SN74LVC245APWR | 3.3 V only (1.65–3.6 V); lower tpd (5.4 ns @ 3.3 V); LVTTL input thresholds; different pinout (TSSOP24) | Not pin-compatible; requires PCB redesign; optimized for low-voltage portable electronics | Choose for battery-powered IoT gateways where 3.3 V operation and <6 ns delay outweigh compatibility needs |
Compared with 74HCT245DB,112 and SN74LVC245APWR, the 74HC245DB,112 delivers widest voltage flexibility (2.0–6.0 V), highest noise immunity, and drop-in compatibility with legacy SO20 layouts - making it optimal for industrial retrofits and multi-rail embedded platforms.
Availability
74HC245DB,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller memory expansion, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC245DB,112 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 with focus on efficiency, reliability, and miniaturization for industrial, automotive, and consumer markets.
The 74HC245DB,112 belongs to Nexperia's 74HC logic family - engineered for wide-supply, high-noise-immunity digital interfacing in harsh environments where consistent timing, thermal resilience, and long-term availability are critical.
FAQ
What is the maximum clock frequency supported by the 74HC245DB,112 in a bidirectional bus configuration?
The 74HC245DB,112 does not operate on a clock signal-it is asynchronous. Its usable data rate depends on propagation delay (7 ns typical at VCC = 6.0 V) and bus loading. With 15 pF load and proper termination, it reliably supports bidirectional data toggling up to 100 MHz, verified by dynamic characterization in Table 7 of the Nexperia datasheet Rev. 9.
Can the 74HC245DB,112 be used to interface 3.3 V and 5 V logic domains?
Yes-the 74HC245DB,112 operates from 2.0 V to 6.0 V and features CMOS-compatible inputs with VIH = 3.15 V (min) and VIL = 1.35 V (max) at VCC = 4.5 V. When powered at 5 V, its outputs swing rail-to-rail and are safely readable by 3.3 V inputs with appropriate series resistance if needed for current limiting.
Is the SOT339-1 package of the 74HC245DB,112 RoHS-compliant and halogen-free?
Yes-Nexperia confirms the 74HC245DB,112 in SOT339-1 packaging meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. Full compliance documentation, including substance declarations and test reports, is accessible via Nexperia's product change notification portal using order code 74HC245DB,112.
Does the 74HC245DB,112 require external pull-up or pull-down resistors on DIR or OE pins?
No-DIR and OE are standard CMOS inputs with II ≤ ±0.1 μA at 25 °C and ≤ ±1.0 μA over full temperature range. They may be driven directly from microcontroller GPIOs. Pull resistors are only needed if the driving source floats during reset or power-up; a 10 kΩ pull-down on OE ensures default high-impedance state at power-on.
74HC245DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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,112 FAQ
1.How can I place an order for 74HC245DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC245DB,112 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,112 reliable?
The price and inventory of 74HC245DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC245DB,112 is usually 5 days.
3.What payment methods are accepted for 74HC245DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC245DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC245DB,112?
74HC245DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC245DB,112 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,112?
For technical support, including 74HC245DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC245DB,112 requirements.
6.How does Aetrix verify that 74HC245DB,112 is sourced from the original manufacturer or authorized distributors?
All 74HC245DB,112 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,112 meets industry standards.
7.What is the process for return or replacement of 74HC245DB,112?
All 74HC245DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC245DB,112, 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,112 part is unused and in its original packaging.
Return procedure for 74HC245DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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