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Nexperia USA Inc. 74HCT245PW,112
- Part No.:
- 74HCT245PW,112
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HCT245PW,112.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,906
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Product details
Overview
74HCT245PW,112 from Nexperia is an octal 3-state bidirectional bus transceiver with TTL-compatible inputs and non-inverting outputs, operating from 4.5 V to 5.5 V supply. It features independent direction (DIR) and output enable (OE) controls, 20-pin TSSOP package, and supports high-noise-immunity data transfer between buses in industrial microcontroller systems, memory interfaces, and peripheral expansion modules.
For engineers reviewing the 74HCT245PW,112 datasheet, 74HCT245PW,112 pinout, 74HCT245PW,112 application, or 74HCT245PW,112 equivalent, this device is selected for level-shifting and bus isolation where TTL input thresholds, low propagation delay (<22 ns at 5 V), and guaranteed 3-state output control are required in space-constrained PCB layouts.
Technical Context
The 74HCT245PW,112 implements a dual-bus interface using complementary MOS logic with TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), enabling direct connection to legacy 5 V TTL drivers. Its DIR pin selects data flow direction (A→B or B→A), while active-low OE disables all outputs into high-impedance state-critical for bus arbitration and hot-swap compatibility.
Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The device operates across -40 °C to +125 °C, meets JEDEC JESD7A and JESD8C standards, and delivers 6 mA output drive capability with VOL ≤ 0.26 V and VOH ≥ 3.98 V under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL logic domains and stable operation under rail variation. |
| Propagation Delay | 10 ns typ (VCC = 5 V, CL = 15 pF) - Enables reliable 50 MHz bus handshaking in synchronous peripheral interfaces. |
| Output Drive | ±6 mA - Sufficient to drive 10 LSTTL loads or terminate 50 Ω transmission lines without external buffers. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees noise margin >0.4 V in noisy industrial environments. |
| 3-State Leakage | IOZ ≤ ±5.0 μA (VCC = 5.5 V) - Prevents signal corruption during bus contention or power sequencing. |
| Operating Temperature | -40 °C to +125 °C - Validated for under-hood automotive ECUs and industrial PLC backplanes. |
| Power Dissipation | 250 mW max (TSSOP20) - Supports continuous operation in thermally constrained enclosures without forced cooling. |
Pinout & Package
TSSOP20 (SOT360-1) package: 20-lead plastic thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | LOW enables A→B data flow; HIGH enables B→A - critical for full-duplex bus arbitration. |
| 2–9 (A0–A7) | Port A data I/O | Bidirectional terminals tied to microcontroller address/data bus; internally buffered with CMOS drivers. |
| 10 (GND) | Ground reference | 0 V return path for all logic and output currents; must be low-inductance connection for signal integrity. |
| 11–18 (B0–B7) | Port B data I/O | Second bus port with identical electrical characteristics to Port A; supports isolated memory or peripheral expansion. |
| 19 (OE) | Active-low output enable | Drives all A/B outputs to high-impedance when HIGH - essential for multi-master bus sharing. |
| 20 (VCC) | Positive supply | 5 V nominal rail; decoupling capacitor (100 nF) required within 5 mm of pin for transient immunity. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH/VIL thresholds match legacy 5 V TTL families, eliminating level-shifters in mixed-logic designs. |
| Non-inverting 3-state outputs | Preserves signal polarity during bidirectional transfer and ensures clean bus release without glitches. |
| Input clamp diodes | Enable safe overvoltage tolerance up to VCC + 0.5 V using series resistors - simplifies interface to higher-voltage sensors. |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during ESD or supply transients. |
| ESD protection | HBM >2000 V, CDM >1000 V - meets IEC 61000-4-2 Level 3 for handling in uncontrolled environments. |
Applications
| Industrial PLC Backplane | Microcontroller Peripheral Expansion |
|---|---|
Use Scenario: Isolating CPU address/data bus from modular I/O cards in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Bidirectional bus buffer with direction-controlled data routing and OE-gated bus release during card hot-swap. Use Value: Enables deterministic bus arbitration and eliminates signal contention during module insertion/removal at full 5 V operation. | Use Scenario: Interfacing an ARM Cortex-M4 MCU with parallel LCD controller and SRAM memory on a compact embedded board. IC Role / Device Role / Timing Role: Level-translating transceiver managing shared 8-bit data bus between 3.3 V MCU and 5 V peripherals. Use Value: Eliminates need for discrete level shifters while maintaining <10 ns timing margins for 20 MHz SRAM access. |
| Legacy System Bus Bridge | Test Equipment Signal Routing |
Use Scenario: Connecting ISA-bus legacy instrumentation to modern FPGA-based data acquisition systems. IC Role / Device Role / Timing Role: TTL-input compatible octal transceiver synchronizing asynchronous bus cycles with precise OE-controlled gating. Use Value: Provides deterministic 3-state isolation during bus turnaround, preventing metastability in mixed-speed system integration. | Use Scenario: Configurable signal path selection in automated test fixtures routing DUT signals to multiple measurement instruments. IC Role / Device Role / Timing Role: Programmable bus isolator controlled by FPGA GPIOs for dynamic reconfiguration of analog/digital signal paths. Use Value: Reduces fixture wiring complexity and enables software-defined signal routing without mechanical relays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT245PWR | TI part in TSSOP20; identical VCC range, VIH/VIL, and timing specs; slightly higher ICC (160 μA max vs 80 μA). | Same industrial temperature grade; validated for TI-specific reference designs with C2000 MCUs. | Select when sourcing from TI-authorized channels or requiring TI's long-term product continuity assurance. |
| 74LVC245APW,118 | Nexperia LVC variant: 1.65–3.6 V supply only; lower drive (24 mA), faster tpd (5.3 ns @ 3.3 V); no TTL input compatibility. | Designed for 3.3 V-only systems; unsuitable for 5 V TTL interfacing without external level translation. | Choose only for new 3.3 V designs prioritizing speed and low voltage operation over backward compatibility. |
Compared with SN74HCT245PWR, the 74HCT245PW,112 offers lower quiescent current and identical pinout, while 74LVC245APW,118 trades TTL compatibility for 3.3 V efficiency-making the original optimal for mixed-voltage legacy upgrades.
Availability
74HCT245PW,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller peripheral expansion, and legacy system bus bridges requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT245PW,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 solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The 74HCT245 product line targets robust, pin-compatible replacements for legacy 74-series logic in industrial control and infrastructure applications-designed for drop-in reliability, wide temperature operation, and strict JEDEC compliance.
FAQ
What is the maximum clock frequency supported by the 74HCT245PW,112?
The 74HCT245PW,112 does not operate on a clock; it is an asynchronous transceiver. Its usable data rate depends on propagation delay (10 ns typical at 5 V) and system setup/hold timing. For reliable operation with 15 pF loads, it supports bus toggle rates up to 50 MHz in well-designed layouts with proper termination and decoupling.
Can the 74HCT245PW,112 interface between 3.3 V and 5 V logic domains?
No-it is not a level shifter. Its inputs require TTL-compatible thresholds (VIH ≥ 2.0 V), but its outputs swing rail-to-rail (0 V to VCC). Driving a 3.3 V input with its 5 V outputs risks damage unless current-limiting or clamping is added. Use dedicated level translators like TXB0108 for safe 3.3 V ↔ 5 V interfacing.
Is the exposed thermal pad on the TSSOP20 package electrically connected?
No-the thermal pad on the 74HCT245PW,112 (SOT360-1) is not electrically connected to any internal node. Nexperia documentation states it may remain floating or be soldered to GND for thermal improvement, but no electrical function is assigned to it.
How does the DIR pin behave during power-up or brown-out conditions?
The DIR pin has no internal pull-up or pull-down. During power-up or brown-out, its state is undefined until externally biased. To prevent unintended bus contention, tie DIR to a known state (e.g., via 10 kΩ resistor to GND or VCC) before VCC stabilizes, or control it from a reset-managed GPIO.
74HCT245PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74HCT245PW,112 FAQ
1.How can I place an order for 74HCT245PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT245PW,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 74HCT245PW,112 reliable?
The price and inventory of 74HCT245PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT245PW,112 is usually 5 days.
3.What payment methods are accepted for 74HCT245PW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT245PW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT245PW,112?
74HCT245PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT245PW,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 74HCT245PW,112?
For technical support, including 74HCT245PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT245PW,112 requirements.
6.How does Aetrix verify that 74HCT245PW,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT245PW,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 74HCT245PW,112 meets industry standards.
7.What is the process for return or replacement of 74HCT245PW,112?
All 74HCT245PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT245PW,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 74HCT245PW,112 part is unused and in its original packaging.
Return procedure for 74HCT245PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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