My Inquiry
My Account
Nexperia USA Inc. 74AHCT245D,112
- Part No.:
- 74AHCT245D,112
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74AHCT245D,112.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:36,480
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74AHCT245D,112 from Nexperia is an octal bus transceiver with 3-state outputs, designed for bidirectional data transmission between two 8-bit buses. It operates at 4.5–5.5 V supply, features ±24 mA output drive, 8 ns typical propagation delay at 5 V, and TTL-compatible inputs. Used in microcontroller peripheral interfacing and memory address/data bus isolation.
For engineers reviewing the 74AHCT245D,112 datasheet, 74AHCT245D,112 pinout, 74AHCT245D,112 application, or 74AHCT245D,112 equivalent, key selection criteria include voltage-level translation capability, bus direction control timing, 3-state output leakage current, and ESD robustness for industrial I/O expansion.
Technical Context
This transceiver implements dual-rail bidirectional data flow controlled by DIR (direction) and OE (output enable) pins. The device uses advanced silicon-gate CMOS technology to ensure TTL-level input thresholds and rail-to-rail CMOS output swing. Propagation delay asymmetry between A→B and B→A paths is specified at ≤1 ns under matched load conditions.
It supports hot insertion due to Ioff partial power-down protection and guarantees no bus contention during power-up/down sequencing. Input hysteresis of 0.5 V minimizes noise susceptibility on control lines in electrically noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with legacy 5 V TTL and mixed-voltage system backplanes |
| Propagation Delay | 8 ns max at VCC = 5 V, CL = 50 pF - enables reliable operation up to 60 MHz bus clock rates |
| Output Drive | ±24 mA - sufficient to drive 15 LSTTL loads or terminate unterminated stubs on PCB traces |
| Input Threshold | VIL = 0.8 V, VIH = 2.0 V - matches standard TTL logic levels for seamless interface with 74LS/74F families |
| ESD Protection | HBM ±2 kV - meets IEC 61000-4-2 Level 2 for board-level handling without additional protection circuitry |
| Ioff Current | ≤10 µA at VCC = 0 V - prevents back-driving of powered buses during hot-swap or partial power-down |
Pinout & Package
Supplied in SO20 (Small Outline, 20-pin) package with 1.27 mm pitch, JEDEC MS-013AC compliant, body size 12.8 × 7.5 mm, 1.75 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Data inputs/outputs (Port A) | Bidirectional I/O pins connected to first 8-bit bus; high-impedance when OE high |
| B0–B7 | Data inputs/outputs (Port B) | Bidirectional I/O pins connected to second 8-bit bus; direction determined by DIR |
| DIR | Direction control input | Low = A→B transfer; High = B→A transfer - asynchronous edge-triggered behavior not supported |
| OE | Output enable input | Active-low; forces all A/B pins into high-impedance state when high - used for bus arbitration |
| VCC | Positive supply | 5 V nominal supply connection; decoupling capacitor required within 10 mm of pin |
| GND | Ground reference | Signal and power ground return path; must be low-inductance connection to minimize switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus interface | Single DIR pin controls full 8-bit data flow direction without external logic or timing constraints |
| 3-state outputs with Ioff | Prevents current backflow when VCC = 0 V, enabling safe live insertion into powered systems |
| TTL-compatible inputs | Accepts standard 0.8 V / 2.0 V thresholds - eliminates need for level-shifting buffers in 5 V legacy designs |
| Hot-swappable operation | Guaranteed no bus contention during power sequencing - critical for modular backplane architectures |
Applications
| Microcontroller Bus Expansion | Memory Address/Data Isolation |
|---|---|
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU to drive multiple parallel peripherals (LCD, ADC, FPGA). IC Role / Device Role / Timing Role: Bidirectional data bridge between MCU's native 8-bit data port and extended peripheral bus. Use Value: Eliminates need for discrete logic gates or CPLD-based bus arbiters while maintaining cycle-accurate timing. | Use Scenario: Isolating SRAM address/data lines from a shared microprocessor bus during DMA transfers. IC Role / Device Role / Timing Role: Direction-controlled buffer preventing signal contention between CPU and DMA controller. Use Value: Enables zero-wait-state memory access by eliminating bus turnaround delays inherent in open-drain solutions. |
| Industrial I/O Module Interface | Legacy System Protocol Translation |
Use Scenario: Interfacing 5 V PLC I/O cards with a 3.3 V industrial controller via opto-isolated bus segments. IC Role / Device Role / Timing Role: Voltage-level agnostic bus transceiver placed between isolation barrier and controller side. Use Value: Maintains signal integrity across galvanic isolation without requiring separate level shifters per line. | Use Scenario: Replacing obsolete 74LS245 in retro-computing restoration projects using modern PCB assemblies. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement with improved speed and drive strength. Use Value: Restores full 8-bit parallel communication bandwidth while reducing board-level power dissipation by 40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT245N | DIP-20 package; 10 ns max tPD vs. 8 ns for SO20 version; same electrical specs | Suitable for through-hole prototyping or legacy repair; higher parasitic inductance limits >40 MHz use | Select for hand-soldered evaluation or field repair where SOIC rework is impractical |
| 74LVC245AD,118 | 1.65–3.6 V supply range; lower drive (±24 mA only at 3.3 V); different input thresholds | Required for mixed-voltage 3.3 V/5 V systems with level translation; not 5 V tolerant without external resistors | Choose when interfacing with modern low-voltage FPGAs or SoCs where 5 V operation is unnecessary |
Compared with SN74AHCT245N, the 74AHCT245D,112 offers superior high-frequency performance and smaller footprint; versus 74LVC245AD,118, it provides guaranteed 5 V operation and TTL input compatibility at the cost of voltage flexibility.
Availability
74AHCT245D,112 is available at Aetrix Electronics and suitable for industrial control panels, embedded instrumentation interfaces, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for 74AHCT245D,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 focused on high-volume, high-reliability logic, discrete, and MOSFET components for automotive, industrial, and consumer applications.
The 74AHCT series delivers advanced CMOS performance with TTL-compatible inputs, targeting cost-sensitive, noise-immune digital interface applications in harsh environments.
FAQ
Can 74AHCT245D,112 operate at 3.3 V?
No. The 74AHCT245D,112 is specified only for 4.5–5.5 V operation. At 3.3 V, input thresholds become undefined and output drive falls below specification. For 3.3 V systems, consider the 74LVC245AD,118 or 74ALVC245PW,118, which are explicitly characterized down to 1.65 V.
What is the maximum capacitive load this device can drive reliably?
The 74AHCT245D,112 is characterized up to 50 pF load capacitance with 8 ns typical propagation delay. Driving >70 pF increases delay nonlinearly and may cause setup/hold violations in synchronous systems. For heavier loads, add series termination or reduce trace length.
Does DIR pin require pull-up or pull-down resistors?
Yes. The DIR pin has no internal bias; floating states cause undefined direction control and potential bus contention. A 10 kΩ pull-down resistor ensures default A→B mode at power-on; pull-up sets B→A. OE should also be actively driven or pulled low.
Is this part suitable for hot-plug applications?
Yes. The Ioff specification guarantees ≤10 µA leakage when VCC = 0 V, preventing back-powering of live buses. Combined with bus-hold and power-up 3-state, it meets requirements for modular backplane hot-swap per IEC 61000-4-2 Level 2.
74AHCT245D,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74AHCT245D,112 FAQ
1.How can I place an order for 74AHCT245D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT245D,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 74AHCT245D,112 reliable?
The price and inventory of 74AHCT245D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT245D,112 is usually 5 days.
3.What payment methods are accepted for 74AHCT245D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT245D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT245D,112?
74AHCT245D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT245D,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 74AHCT245D,112?
For technical support, including 74AHCT245D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT245D,112 requirements.
6.How does Aetrix verify that 74AHCT245D,112 is sourced from the original manufacturer or authorized distributors?
All 74AHCT245D,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 74AHCT245D,112 meets industry standards.
7.What is the process for return or replacement of 74AHCT245D,112?
All 74AHCT245D,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT245D,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 74AHCT245D,112 part is unused and in its original packaging.
Return procedure for 74AHCT245D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74AHCT245D,112 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
