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NXP Semiconductors N74F245D,623
- Part No.:
- N74F245D,623
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
N74F245D,623.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,638
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Product details
Overview
N74F245D,623 from Nexperia is an octal bidirectional 3-state transceiver IC used for bus interface isolation and data direction control between two 8-bit parallel buses. It features non-inverting logic, 4.0 ns typical propagation delay, ±5 V supply operation, 64 mA sink capability on B-port outputs, and high-impedance output disable during power-off - enabling safe hot-swap and bus-sharing in industrial backplane systems.
For engineers reviewing the N74F245D,623 datasheet, N74F245D,623 pinout, N74F245D,623 application, or N74F245D,623 equivalent, key selection criteria include bidirectional bus drive strength (B-port: 15 mA source / 64 mA sink), T/R-controlled direction switching, OE-gated 3-state behavior, and SO20 package compatibility with legacy 74F logic layouts.
Technical Context
The N74F245D,623 implements a dual-bus transceiver architecture with independent Transmit/Receive (T/R) control and Output Enable (OE) input. Its B-port outputs are rated for higher current drive (64 mA sink) than A-port outputs (24 mA sink), making it asymmetrically optimized for driving heavier capacitive loads on one side of the bus interface.
It operates strictly within the 74F TTL family voltage and timing specifications: VCC = 4.5–5.5 V, tPLH/tPHL ≤ 6.0 ns (max), and guaranteed high-impedance state when OE is high - critical for preventing bus contention in multi-master systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74F TTL-compatible with 5 V nominal supply |
| Propagation Delay | 4.0 ns typical (A↔B), enabling >100 MHz bus toggle rates in short traces |
| B-port Sink Current | 64 mA per output - supports direct drive of multiple TTL inputs or moderate PCB trace capacitance |
| A-port Source Current | 15 mA per output - sufficient for standard TTL fan-out without buffering |
| Supply Current (ICC) | 70–100 mA total - defines thermal budget in dense logic arrays |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for office and industrial control enclosures |
| Output Enable Polarity | Active-low OE - simplifies connection to open-collector control signals or microcontroller GPIO |
Pinout & Package
Package: Plastic small outline (SO20), 20-pin, 7.5 mm body width, RoHS-compliant (SOT163-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low global enable; forces all B-port outputs into high-impedance when high |
| 2–9 | A0–A7 | A-side bidirectional data terminals; connected to local bus or controller |
| 10 | GND | Ground reference for all logic and I/O |
| 11 | VCC | +5 V power supply; decoupling capacitor required at pin |
| 12 | OE (redundant label in original doc; confirmed as OE) | Same function as Pin 1 - dual-labeled for layout clarity in older schematics |
| 13–19, 20 | B0–B7 | B-side bidirectional data terminals; designed for higher-current bus loading |
| 19 | T/R (Transmit/Receive) | Direction control: low = B→A, high = A→B; determines data flow path |
Key Features
| Feature | Design Value |
|---|---|
| Asymmetric drive strength | B-port sinks 64 mA (vs. A-port's 24 mA), allowing dedicated high-load bus segment interfacing |
| Power-off high-impedance | B-port outputs enter Z-state when VCC = 0 V - prevents back-driving and bus contention during hot insertion |
| Fast 3-state enable/disable | tPZH/tPZL ≤ 9.0 ns max - minimizes bus turnaround time in burst-mode transfers |
| Input clamp protection | VIK = –1.2 V min - protects against negative transients on A/B port inputs |
| Low-level input current | IIL = –1.2 mA max at 0.5 V - ensures reliable logic-low recognition under noise or weak pull-downs |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from expansion slot peripherals in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow between microprocessor and field I/O modules under T/R control. Use Value: 64 mA B-port sink drives long PCB traces and multiple TTL loads without external buffers, reducing component count. |
Use Scenario: Extending 8-bit ISA-style data bus across daughterboard connectors in test equipment rack systems. IC Role / Device Role / Timing Role: Direction-controlled bus repeater enabling synchronous read/write cycles between host and add-on cards. Use Value: 4.0 ns propagation delay ensures setup/hold timing margins remain intact at 20 MHz bus clock rates. |
| Microcontroller Peripheral Multiplexing | Memory-Mapped I/O Bridge |
|
Use Scenario: Sharing a single 8-bit GPIO port between UART TX/RX and SPI peripheral on resource-constrained MCUs. IC Role / Device Role / Timing Role: Configurable data path switch controlled by MCU GPIO via T/R and OE pins. Use Value: Active-low OE allows direct connection to MCU reset or sleep signal to isolate peripherals during low-power modes. |
Use Scenario: Interfacing 8-bit microcontroller to external SRAM or EPROM using shared address/data bus. IC Role / Device Role / Timing Role: Bidirectional data buffer isolating memory bus from processor during instruction fetch or DMA cycles. Use Value: Guaranteed high-impedance state when OE is asserted prevents memory bus contention during interrupt service routines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F245N | Identical electrical specs and pinout; DIP20 package (SOT146-1) instead of SO20 | Through-hole mounting only; no surface-mount footprint compatibility | Select for prototyping or legacy through-hole PCBs where reflow is not available |
| 74LCX245 | Lower VCC range (2.0–3.6 V), CMOS technology, 5 V tolerant inputs, 2.5 ns typical delay | Not 74F TTL compatible; requires level-shifting if interfacing with 5 V logic | Select for mixed-voltage systems needing lower power and faster speed, with appropriate voltage translation |
Compared with SN74F245N and 74LCX245, the N74F245D,623 provides drop-in SO20 replacement for 74F-based designs requiring 5 V operation, proven reliability in industrial temperature range, and full backward compatibility with Philips/Nexperia's 74F qualification standards - without requiring layout changes or voltage translation.
Availability
N74F245D,623 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, microcontroller peripheral multiplexing, and memory-mapped I/O bridges requiring stable component supply and long-term obsolescence management.
Supply support for N74F245D,623 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 leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division, with focus on automotive, industrial, computing, and consumer markets.
The N74F245D,623 belongs to Nexperia's legacy 74F logic portfolio, engineered for robustness in commercial-temperature industrial control and instrumentation systems where TTL compatibility, bus drive strength, and long-term supply stability are essential.
FAQ
What is the maximum operating voltage for the N74F245D,623?
The N74F245D,623 has an absolute maximum supply voltage (VCC) of +7.0 V, but its recommended operating range is strictly 4.5 V to 5.5 V. Operating outside this window risks violating DC electrical characteristics such as VOH, VOL, and output drive capability. The N74F245D,623 is not rated for 3.3 V operation and must be used with a regulated 5 V rail.
Does the N74F245D,623 support hot-swap or live-insertion?
Yes - the N74F245D,623 enters a high-impedance state on all B-port outputs when VCC drops to 0 V, preventing back-driving of the bus during insertion or removal. This behavior is explicitly specified in the datasheet under "Outputs are placed in high impedance state during power-off conditions", making the N74F245D,623 suitable for hot-pluggable backplane applications.
What is the difference between the A-port and B-port drive capabilities of the N74F245D,623?
The B-port outputs of the N74F245D,623 are rated for 64 mA sink current and 15 mA source current, while the A-port outputs provide 24 mA sink and 15 mA source. This asymmetry means the B-port is optimized for driving heavier loads (e.g., longer traces or multiple TTL inputs), whereas the A-port is intended for lighter local bus connections - a key design distinction reflected in the N74F245D,623's internal output stage sizing.
Can the N74F245D,623 be used with 3.3 V logic systems?
No - the N74F245D,623 is a 5 V-only TTL-family device with VIL = 0.8 V and VIH = 2.0 V thresholds, and no 5 V tolerance on inputs when operated at lower VCC. Using it with 3.3 V logic without level translation risks incorrect logic interpretation and marginal timing. For 3.3 V systems, consider 74LCX245 or 74LVC245 instead of the N74F245D,623.
Is the N74F245D,623 pin-compatible with other 74F245 variants?
Yes - the N74F245D,623 shares identical pinout and functionality with all 74F245 variants including N74F245N (DIP20) and N74F245DB (SSOP20). All use the SOT163-1 SO20 footprint, and the pin assignments for A0–A7, B0–B7, OE, T/R, VCC, and GND are fully consistent across packages - enabling direct substitution in existing layouts when upgrading from DIP to SO.
N74F245D,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 3mA, 24mA; 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
N74F245D,623 FAQ
1.How can I place an order for N74F245D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F245D,623 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 N74F245D,623 reliable?
The price and inventory of N74F245D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F245D,623 is usually 5 days.
3.What payment methods are accepted for N74F245D,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F245D,623 transactions.
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4.How is shipping managed for N74F245D,623?
N74F245D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F245D,623 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 N74F245D,623?
For technical support, including N74F245D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F245D,623 requirements.
6.How does Aetrix verify that N74F245D,623 is sourced from the original manufacturer or authorized distributors?
All N74F245D,623 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 N74F245D,623 meets industry standards.
7.What is the process for return or replacement of N74F245D,623?
All N74F245D,623 units undergo pre-shipment inspection (PSI). If there is an issue with N74F245D,623, 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 N74F245D,623 part is unused and in its original packaging.
Return procedure for N74F245D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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