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Texas Instruments 74ACT11245PWG4
- Part No.:
- 74ACT11245PWG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ACT11245PWG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,223
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Product details
Overview
74ACT11245PWG4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous two-way data communication between A and B buses in TTL-voltage-compatible systems. It features direction control (DIR), output enable (OE), flow-through pinout architecture, EPIC CMOS process, and operates from –40°C to 85°C at 4.5–5.5 V supply.
For engineers reviewing the 74ACT11245PWG4 datasheet, 74ACT11245PWG4 pinout, 74ACT11245PWG4 application, or 74ACT11245PWG4 equivalent, key selection criteria include bidirectional bus isolation timing (tPLH/tPHL ≤ 10 ns), 24 mA drive strength, 3-state output leakage (±0.5 µA), input compatibility with TTL logic levels, and TSSOP-24 package suitability for high-density PCB layouts.
Technical Context
The 74ACT11245PWG4 implements dual 8-bit bidirectional data paths controlled by a single DIR input and a shared OE input, enabling either A→B or B→A transmission or full bus isolation. Its flow-through architecture places inputs and outputs on opposite sides of the package to minimize trace crossovers.
Based on Texas Instruments' EPIC (Enhanced-Performance Implanted CMOS) 1-µm process, the device delivers TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), rail-to-rail output swing, and robust latch-up immunity (500 mA typical at 125°C), supporting stable operation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and CMOS systems without level-shifting. |
| Propagation Delay | tPLH/tPHL ≤ 10 ns - Enables reliable operation in high-speed digital backplanes up to ~50 MHz clock domains. |
| Output Drive | ±24 mA - Sufficient to drive 50-pF loads across 10-cm traces while maintaining signal integrity. |
| 3-State Leakage | ±0.5 µA - Guarantees minimal bus contention during isolation, critical for multi-drop bus arbitration. |
| Operating Temperature | –40°C to +85°C - Qualified for extended industrial temperature range without derating. |
| Input Compatibility | TTL voltage thresholds (VIH = 2.0 V, VIL = 0.8 V) - Allows direct interfacing with legacy 74LS/74F logic without translators. |
| Power Dissipation | 0.7 W (PW package, TA = 55°C) - Supports continuous operation in compact surface-mount layouts with natural convection cooling. |
Pinout & Package
TSSOP-24 (PW) package: 7.8 mm × 4.4 mm body, 0.65 mm pitch, thin profile (1.2 mm max height), JEDEC MO-153 compliant, with center-aligned VCC and GND pins to suppress switching noise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output port A | 8-bit bidirectional data interface connected to local bus; driven high/low or placed in high-impedance state per DIR/OE. |
| B1–B8 | Input/Output port B | 8-bit bidirectional data interface connected to remote bus; direction relative to A determined by DIR logic level. |
| DIR | Direction control input | Active-HIGH selects A→B transfer; LOW selects B→A transfer - enables flexible bus topology reconfiguration. |
| OE | Output enable input | Active-LOW enables transceiver; HIGH forces all A/B outputs into 3-state - provides hardware-level bus isolation. |
| VCC | Power supply | Two dedicated pins (pins 24 and 19) reduce IR drop and improve PSRR in high-current switching scenarios. |
| GND | Ground reference | Four dedicated pins (pins 5, 6, 7, 8) lower ground impedance and minimize simultaneous switching noise (SSN). |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Inputs on left side (A1–A8, DIR, OE), outputs on right side (B1–B8), and power/ground centered - eliminates layer jumps and reduces PCB routing complexity. |
| Center-pin VCC/GND configuration | Dual VCC (pins 19, 24) and quad GND (pins 5–8) placement minimizes high-frequency ground bounce and improves signal integrity in dense layouts. |
| EPIC CMOS process | 1-µm implanted CMOS technology delivers low static current (ICC ≤ 80 µA), high noise margin, and 500-mA latch-up immunity at 125°C. |
| TTL-voltage compatible inputs | Accepts standard TTL logic levels (0.8 V/2.0 V thresholds) - eliminates need for external level shifters when interfacing with legacy 74LS devices. |
| 3-state output control | Independent OE input disables both A and B ports simultaneously - ensures clean bus release without glitches during hot-swap or power sequencing. |
Applications
| Industrial PLC Backplane Interface | Legacy System Bus Bridge |
|---|---|
Use Scenario: Interfacing a modern microcontroller-based I/O module with an older 8-bit parallel bus in programmable logic controller racks. IC Role / Device Role / Timing Role: Bidirectional data translator that isolates voltage domains and synchronizes handshaking between mismatched timing protocols. Use Value: Eliminates need for discrete buffers and level shifters; supports hot-plug detection via OE-controlled isolation without disrupting adjacent slots. | Use Scenario: Connecting ISA-bus peripherals (e.g., data acquisition cards) to newer PCI-to-ISA bridge controllers in test instrumentation. IC Role / Device Role / Timing Role: Octal transceiver managing address/data multiplexing and direction control under ISA protocol timing constraints. Use Value: Matches ISA's 8-MHz maximum bus rate with guaranteed tPLH/tPHL ≤ 10 ns and supports 3-state hold-off during DMA cycles. |
| Embedded Control Data Hub | Modular Test Equipment Interconnect |
Use Scenario: Aggregating sensor data from multiple 8-bit ADCs onto a central FPGA processing bus in environmental monitoring systems. IC Role / Device Role / Timing Role: Time-multiplexed bus arbitrator using DIR/OE to route sequential channel reads without software overhead. Use Value: Reduces FPGA pin count by 16 vs. point-to-point connections; flow-through layout simplifies 4-layer board routing in space-constrained enclosures. | Use Scenario: Enabling reconfigurable signal routing between modular analog/digital instrument cards in automated test equipment (ATE) chassis. IC Role / Device Role / Timing Role: Reversible data path element allowing dynamic assignment of master/slave roles across card slots via firmware-controlled DIR signals. Use Value: Supports field-upgradable test configurations without hardware changes; TSSOP-24 footprint fits standardized 10-mm inter-card spacing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT245PWR | Same function, pinout, and specs; identical TSSOP-24 package and marking (AT245); manufactured by TI with identical EPIC process. | No functional or layout difference - direct second-source part with same qualification and reliability data. | Select when requiring TI-authorized alternate sourcing without redesign or requalification. |
| 74LCX245MTCX | Lower VCC range (2.0–3.6 V), higher speed (tPD ≈ 5.5 ns), but not TTL-input compatible - requires level translation for 5-V systems. | Suitable only in mixed-voltage 3.3-V domains; incompatible with direct 5-V TTL interfaces without additional circuitry. | Choose only for new 3.3-V designs where power efficiency and speed outweigh compatibility requirements. |
Compared with SN74ACT245PWR, the 74ACT11245PWG4 offers identical performance and drop-in compatibility; versus 74LCX245MTCX, it preserves 5-V TTL interoperability at the cost of slightly higher propagation delay and static current - making it the preferred choice for legacy system upgrades.
Availability
74ACT11245PWG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy system bus bridges, embedded control data hubs, modular test equipment interconnects, and high-reliability 5-V digital subsystems requiring stable component supply over extended production lifecycles.
Supply support for 74ACT11245PWG4 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog, embedded processing, logic, and memory solutions for industrial, automotive, and communications markets.
The 74ACT11245PWG4 belongs to TI's ACT (Advanced CMOS Technology) logic family, engineered for high-speed, low-noise 5-V digital interfacing in industrial control and legacy system integration applications.
FAQ
What is the maximum operating frequency supported by the 74ACT11245PWG4?
The 74ACT11245PWG4 does not specify a maximum clock frequency directly, but its worst-case propagation delay (tPLH/tPHL ≤ 10 ns) and 3-state enable/disable times (tPZH/tPLZ ≤ 13.9 ns) support reliable operation in asynchronous bus systems with effective data rates up to approximately 50 MHz. Actual usable frequency depends on load capacitance, trace length, and system timing margins - design validation is required for synchronous clocked applications.
Is the 74ACT11245PWG4 pin-compatible with the SN74ACT245 series?
Yes, the 74ACT11245PWG4 is functionally and physically pin-compatible with SN74ACT245PWR and other SN74ACT245 variants in TSSOP-24 packages. Both share identical pin assignments, electrical specifications, timing parameters, and device marking (AT245), making them direct second-source replacements without PCB or firmware changes.
Does the 74ACT11245PWG4 support hot-swap or live-insertion applications?
The 74ACT11245PWG4 supports hot-swap applications when used with proper power sequencing: its absolute maximum ratings allow VCC to be applied before or after inputs (VI range: –0.5 V to VCC + 0.5 V), and the OE pin enables deterministic bus isolation. However, it lacks built-in hot-swap protection circuitry (e.g., slew-rate limiting or current limiting), so external current-limiting resistors and staggered connector pin lengths are recommended for robust live-insertion.
What is the meaning of "PWG4" in the 74ACT11245PWG4 part number?
"PW" denotes the TSSOP (Thin Shrink Small-Outline Package) with 24 pins and 0.65 mm pitch; "G4" indicates Green (RoHS-compliant, no bromine/antimony flame retardants) finish with CU NIPDAU lead termination and JEDEC Level-1 moisture sensitivity rating (unlimited floor life at ≤30°C/60% RH). This suffix confirms compliance with environmental standards and specifies packaging and handling requirements.
Can the 74ACT11245PWG4 interface directly with 3.3-V logic devices?
No, the 74ACT11245PWG4 is not designed for direct 3.3-V logic interfacing. Its inputs require TTL-compatible thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and operate only from 4.5–5.5 V supply. Driving 3.3-V inputs risks overvoltage damage, and accepting 3.3-V logic levels may result in marginal noise margins. A level-shifting solution (e.g., TXB0108 or discrete resistor divider) is required for safe 3.3-V/5-V domain bridging.
74ACT11245PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 24-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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
74ACT11245PWG4 FAQ
1.How can I place an order for 74ACT11245PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11245PWG4 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 74ACT11245PWG4 reliable?
The price and inventory of 74ACT11245PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11245PWG4 is usually 5 days.
3.What payment methods are accepted for 74ACT11245PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11245PWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11245PWG4?
74ACT11245PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11245PWG4 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 74ACT11245PWG4?
For technical support, including 74ACT11245PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11245PWG4 requirements.
6.How does Aetrix verify that 74ACT11245PWG4 is sourced from the original manufacturer or authorized distributors?
All 74ACT11245PWG4 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 74ACT11245PWG4 meets industry standards.
7.What is the process for return or replacement of 74ACT11245PWG4?
All 74ACT11245PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11245PWG4, 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 74ACT11245PWG4 part is unused and in its original packaging.
Return procedure for 74ACT11245PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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