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NXP Semiconductors 74HCT245N,652
- Part No.:
- 74HCT245N,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HCT245N,652.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,874
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Product details
Overview
74HCT245N,652 from NXP Semiconductors (formerly Philips) is an octal non-inverting 3-state bidirectional bus transceiver with TTL-compatible inputs and CMOS outputs. It provides direction-controlled data flow between two 8-bit buses, features active-low output enable (OE) and direction (DIR) control, and operates at 4.5–5.5 V over −40 °C to +125 °C. It is used in microcontroller system bus expansion, memory interfacing, and legacy parallel I/O bridging.
For engineers reviewing the 74HCT245N,652 datasheet, 74HCT245N,652 pinout, 74HCT245N,652 application, or 74HCT245N,652 equivalent, key selection criteria include its 5 V TTL-level input compatibility, 10 ns typical propagation delay at 5 V/15 pF, 3-state isolation timing (tPZH/tPHZ ≤ 30 ns), and DIP20 package suitability for prototyping and industrial backplane interfaces.
Technical Context
The 74HCT245N,652 implements a dual-bus interface using eight independent bidirectional channels, each controlled by shared DIR and OE signals. Its HCT logic family ensures TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) while delivering CMOS-level output drive (±6 mA at VCC = 4.5 V).
It supports true non-inverting data transfer in both directions - A→B when DIR = HIGH, B→A when DIR = LOW - with high-impedance (Z) outputs asserted when OE = HIGH. The device complies with JEDEC standard no. 7A and includes ESD protection exceeding 2000 V HBM and 200 V MM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS outputs; enables direct interfacing with 5 V LSTTL systems without level shifters. |
| Supply Voltage | 4.5–5.5 V - Matches standard 5 V digital rails; not rated for 3.3 V operation. |
| Propagation Delay | 10 ns typical (An↔Bn, CL = 15 pF, VCC = 5 V) - Enables reliable operation up to ~50 MHz bus toggle rates. |
| Output Drive | ±6 mA (VOH/VOL at VCC = 4.5 V) - Sufficient to drive 10 LSTTL loads or moderate PCB trace capacitance. |
| 3-State Enable/Disable | tPZH/tPHZ ≤ 30 ns (VCC = 4.5 V, Tamb ≤ +85 °C) - Ensures fast bus arbitration and prevents contention during direction switching. |
| Operating Temperature | −40 °C to +125 °C - Qualified for under-hood automotive, industrial control, and extended-range embedded applications. |
| Input Capacitance | 3.5 pF - Low loading on upstream drivers; minimizes signal integrity degradation on high-speed traces. |
Pinout & Package
Package: DIP20 (SOT146-1), plastic dual in-line package, 20 leads, 300 mil width, through-hole mount.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: HIGH enables A→B data flow; LOW enables B→A. |
| 2–9 | A0–A7 | Bus A side I/O terminals - connect to microcontroller/data bus A; function as inputs or outputs depending on DIR/OE state. |
| 10 | GND | Ground reference (0 V) - mandatory return path for all internal logic and output currents. |
| 11–18 | B0–B7 | Bus B side I/O terminals - connect to peripheral/memory bus B; mirror A-side behavior under DIR control. |
| 19 | OE | Active-low output enable: LOW enables transceiver; HIGH forces all A/B pins into high-impedance (Z) state for bus isolation. |
| 20 | VCC | Positive supply (4.5–5.5 V) - powers internal logic and output stages; requires local 100 nF decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Octal bidirectional interface | Single-package solution for full 8-bit parallel bus extension between mismatched subsystems (e.g., MCU ↔ legacy peripheral). |
| TTL-compatible input thresholds | VIH ≥ 2.0 V / VIL ≤ 0.8 V at 5 V - eliminates need for external level translators when interfacing with standard 5 V TTL/LS logic. |
| Non-inverting data path | Data polarity preserved in both directions (A→B and B→A), simplifying protocol design and avoiding inversion logic in firmware/hardware. |
| 3-state bus isolation | OE-controlled high-impedance outputs prevent bus contention during multi-master arbitration or power sequencing. |
| JEDEC 7A compliance | Guarantees interoperability with industry-standard 5 V logic families and test equipment interfaces. |
Applications
| Microcontroller Bus Expansion | Legacy Parallel Printer Interface |
|---|---|
Use Scenario: Extending limited GPIO or address/data bus width of an 8-bit MCU to drive multiple peripherals. IC Role / Device Role / Timing Role: Bidirectional buffer that isolates MCU bus from peripheral loads and enables dynamic direction switching via DIR. Use Value: Eliminates need for discrete transceivers or CPLD glue logic; supports real-time bus sharing with <30 ns isolation timing. |
Use Scenario: Interfacing modern microcontrollers to Centronics-style parallel printers requiring 8-bit data + handshaking lines. IC Role / Device Role / Timing Role: Level-shifting and bus-driving transceiver for unidirectional (host→printer) or bidirectional (status feedback) data paths. Use Value: Direct 5 V TTL compatibility ensures robust signal integrity across 2 m cables; ±6 mA drive sustains printer ACK timing margins. |
| Industrial Backplane Data Routing | Memory-Mapped I/O Bridge |
Use Scenario: Isolating and routing 8-bit data between hot-swappable modules on a 5 V industrial backplane. IC Role / Device Role / Timing Role: Direction-controlled bus switch enabling module-to-module communication while preventing cross-talk during insertion/removal. Use Value: −40 °C to +125 °C rating ensures reliability in enclosed enclosures; 3-state disable timing prevents glitches during hot-swap transitions. |
Use Scenario: Connecting external SRAM or I/O expanders to a microprocessor's multiplexed address/data bus (AD0–AD7). IC Role / Device Role / Timing Role: Separating time-multiplexed AD bus into dedicated address and data phases using DIR and OE synchronized to ALE. Use Value: 10 ns propagation delay meets tight 5 V MPU timing budgets; low 3.5 pF input capacitance avoids clock skew on critical control lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC245N,652 | CMOS-input variant; VIH/VIL referenced to VCC (e.g., VIH ≥ 3.15 V at VCC = 4.5 V); higher noise immunity but incompatible with TTL logic levels. | Requires 5 V CMOS or buffered TTL sources; unsuitable for direct connection to standard LS TTL outputs. | Select only when driving from CMOS or actively level-shifted sources; verify input thresholds match upstream driver VOH/VOL. |
| SN74HCT245N | Functionally identical pinout, timing, and electrical specs; manufactured by Texas Instruments; same JEDEC 7A compliance and −40 °C to +125 °C rating. | No functional difference; validated drop-in replacement per TI datasheet SLFS067K and NXP documentation cross-reference. | Preferred for dual-sourcing; identical layout, BOM, and qualification - no redesign required. |
Compared with 74HC245N,652, the 74HCT245N,652 enables direct interfacing with legacy TTL without level shifters, while SN74HCT245N offers second-source assurance with identical performance and footprint - making it ideal for long-lifecycle industrial designs requiring supply chain resilience.
Availability
74HCT245N,652 is available at Aetrix Electronics and suitable for microcontroller bus expansion, industrial backplane routing, and legacy parallel interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT245N,652 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' semiconductor division.
The 74HCT245N,652 belongs to NXP's legacy logic portfolio designed for robust, pin-compatible replacements of industry-standard TTL and CMOS devices in industrial control, instrumentation, and retro-compatibility applications.
FAQ
What is the recommended operating voltage range for the 74HCT245N,652?
The 74HCT245N,652 is specified for 4.5 V to 5.5 V operation. Operation outside this range - including at 3.3 V or above 5.5 V - is not guaranteed and may result in incorrect logic levels, increased ICC, or permanent damage. Always use a regulated 5 V supply with local decoupling for reliable 74HCT245N,652 performance.
Can the 74HCT245N,652 be used with 3.3 V logic systems?
No, the 74HCT245N,652 is not 3.3 V compatible. Its TTL-compatible inputs require VIH ≥ 2.0 V, but its minimum VCC is 4.5 V - applying 3.3 V will cause undefined operation and potential latch-up. For 3.3 V systems, use 74LVC245 or similar LVCMOS transceivers instead of the 74HCT245N,652.
What is the maximum capacitive load the 74HCT245N,652 can drive reliably?
The 74HCT245N,652 is characterized with CL = 15 pF for timing specifications (e.g., 10 ns tPLH). While it can drive higher loads, propagation delay increases linearly with capacitance, and output transition times degrade. For >30 pF loads, verify timing margins in-system; always limit trace+load capacitance to ≤50 pF for stable 74HCT245N,652 operation at full speed.
How does the DIR pin affect data flow direction in the 74HCT245N,652?
When DIR = HIGH, data flows from A0–A7 to B0–B7; when DIR = LOW, data flows from B0–B7 to A0–A7. This bidirectional control is synchronous with OE: only when OE = LOW does the selected path conduct. The 74HCT245N,652 does not auto-detect direction - DIR must be driven externally by the system controller.
Is the 74HCT245N,652 RoHS compliant and lead-free?
Yes, the 74HCT245N,652 (SOT146-1 package) is RoHS compliant and lead-free per NXP's product change notification PCN 09001. It meets EU Directive 2011/65/EU and contains ≤0.1 wt% lead, with exemptions applied only where technically necessary per Annex III - fully suitable for modern 74HCT245N,652-based designs.
74HCT245N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
74HCT245N,652 FAQ
1.How can I place an order for 74HCT245N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT245N,652 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 74HCT245N,652 reliable?
The price and inventory of 74HCT245N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT245N,652 is usually 5 days.
3.What payment methods are accepted for 74HCT245N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT245N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT245N,652?
74HCT245N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT245N,652 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 74HCT245N,652?
For technical support, including 74HCT245N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT245N,652 requirements.
6.How does Aetrix verify that 74HCT245N,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT245N,652 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 74HCT245N,652 meets industry standards.
7.What is the process for return or replacement of 74HCT245N,652?
All 74HCT245N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT245N,652, 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 74HCT245N,652 part is unused and in its original packaging.
Return procedure for 74HCT245N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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