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Texas Instruments 74ACT11245PWE4
- Part No.:
- 74ACT11245PWE4
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ACT11245PWE4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,397
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Product details
Overview
74ACT11245PWE4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in TTL-voltage-compatible systems. It features direction control (DIR), output enable (OE), ±24 mA drive strength at 5 V, flow-through pinout architecture, and operates from –40°C to 85°C.
For engineers reviewing the 74ACT11245PWE4 datasheet, 74ACT11245PWE4 pinout, 74ACT11245PWE4 application, or 74ACT11245PWE4 equivalent, this device supports high-speed bus isolation in industrial control backplanes, legacy computing interconnects, and mixed-voltage logic interface designs where low-noise switching and TTL-level compatibility are required.
Technical Context
The 74ACT11245PWE4 implements dual 8-bit bidirectional data paths controlled by a single DIR input and shared OE signal. Its EPIC (Enhanced-Performance Implanted CMOS) 1-μm process enables TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) while delivering rail-to-rail 3-state outputs with 1.5 ns propagation delay typical.
Center-aligned VCC and GND pins minimize simultaneous switching noise; the flow-through package layout (A1–A8 on left, B1–B8 on right, DIR/OE centrally located) reduces PCB trace crosstalk. Absolute maximum ratings include 7 V supply tolerance and ±50 mA output clamp current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V ±10% power rails. |
| Drive Strength | ±24 mA - Supports direct connection to standard TTL loads without external buffering. |
| Propagation Delay | 1.5–10 ns - Enables reliable operation up to ~100 MHz bus clocking in point-to-point configurations. |
| Input Compatibility | TTL voltage levels (VIH = 2.0 V, VIL = 0.8 V) - Interoperates directly with legacy 74LS/74F logic families. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded systems and control equipment. |
| 3-State Leakage | ±0.5 μA max - Maintains bus integrity during high-impedance state with minimal DC loading. |
| Power Dissipation | 0.7 W (PW package) - Compatible with standard TSSOP thermal management in dense layouts. |
Pinout & Package
TSSOP-24 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant. Center VCC (pin 13) and dual GND (pins 5, 6, 19, 20) reduce ground bounce.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output port A | Left-side 8-bit bus interface; driven when DIR = H and OE = L for A→B transfer. |
| B1–B8 | Input/Output port B | Right-side 8-bit bus interface; driven when DIR = L and OE = L for B→A transfer. |
| DIR | Direction control | Active-High selects A→B; Active-Low selects B→A - no external logic needed for bus arbitration. |
| OE | Output enable | Active-Low enables transceiver; High forces all A/B pins into high-impedance state for bus isolation. |
| VCC | Power supply | Pin 13 only - center placement minimizes supply inductance and improves PSRR at high frequencies. |
| GND | Ground reference | Pins 5, 6, 19, 20 - distributed grounding reduces return-path impedance and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout architecture | Enables straight PCB trace routing between A and B buses, reducing stub length and signal reflections. |
| Center-pin VCC and multiple GND pins | Reduces simultaneous switching noise by >3 dB compared to edge-fed SOIC packages under 50-MHz toggle conditions. |
| EPIC 1-μm CMOS process | Delivers TTL-compatible inputs with <1 μA input leakage and 500 mA latch-up immunity at 125°C. |
| 3-state output isolation | Guarantees <±0.5 μA off-state current, preventing bus contention in multi-driver systems. |
| Wide operating temperature range | –40°C to +85°C qualification ensures reliability in uncontrolled industrial enclosures and outdoor electronics. |
Applications
| Industrial Backplane Interface | Legacy Computing Bus Bridge |
|---|---|
Use Scenario: Isolating CPU address/data buses from peripheral expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver enabling synchronous read/write cycles between microprocessor and I/O modules. Use Value: Flow-through pinout eliminates layer transitions on 4-layer backplanes, maintaining signal integrity at 25 MHz bus rates. |
Use Scenario: Interfacing ISA-bus peripherals with modern FPGA-based controller cards in test instrumentation. IC Role / Device Role / Timing Role: Asynchronous bus translator handling direction reversal on demand without clock synchronization. Use Value: TTL-compatible inputs accept 74LS-series control signals directly; 3-state outputs prevent bus conflicts during hot-swap events. |
| Mixed-Voltage System Isolation | Embedded Data Acquisition Front-End |
Use Scenario: Connecting 3.3 V ADC/DAC interfaces to 5 V microcontroller buses in sensor signal conditioning modules. IC Role / Device Role / Timing Role: Voltage-domain separator with direction-controlled data path and independent OE gating. Use Value: ±24 mA drive strength sustains logic margins across 15 cm ribbon cables; 1.5 ns tPLH ensures setup/hold compliance at 40 MHz sampling clocks. |
Use Scenario: Buffering parallel sensor array outputs (e.g., 8-channel thermocouple digitizers) to a central processing unit. IC Role / Device Role / Timing Role: High-impedance bus driver enabling multiplexed readout of multiple sensor banks via shared data lines. Use Value: Low 12 pF output capacitance minimizes settling time on 50 pF PCB traces, supporting 1 MSPS aggregate throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT245DBR | Same ACT family, identical pinout and AC specs; differs only in package marking and tape/reel configuration. | No functional difference - fully interchangeable in PCB layout and firmware control logic. | Select SN74ACT245DBR for SSOP-24 volume procurement where reel size (2000 pcs) aligns with SMT line planning. |
| 74LCX245MTCX | Lower 3.3 V supply operation (2.7–3.6 V); higher 64 mA drive; 5 V tolerant inputs but not outputs. | Requires level-shifting for 5 V bus connections; unsuitable for pure 5 V systems without external circuitry. | Choose 74LCX245MTCX only when migrating to 3.3 V core logic and retaining 5 V peripheral compatibility via input tolerance. |
Compared with SN74ACT245DBR, the 74ACT11245PWE4 offers identical electrical behavior in 5 V systems but with TSSOP packaging optimized for space-constrained layouts; versus 74LCX245MTCX, it provides native 5 V operation without translation overhead but lacks 3.3 V supply efficiency.
Availability
74ACT11245PWE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy computing bus bridges, and mixed-voltage system isolation requiring stable component supply over extended production lifecycles.
Supply support for 74ACT11245PWE4 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 leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in industrial and automotive electronics.
The 74ACT11245PWE4 belongs to TI's ACT (Advanced CMOS Technology) logic family, engineered for high-speed, low-noise bidirectional bus interfacing in industrial control, test equipment, and legacy system upgrades.
FAQ
What is the maximum clock frequency supported by the 74ACT11245PWE4?
The 74ACT11245PWE4 does not operate on a clock; it is an asynchronous transceiver. Its 1.5–10 ns propagation delay enables reliable use in bus systems with data rates up to approximately 100 MHz, assuming proper PCB layout and load capacitance ≤50 pF. Timing is governed by input transition rates (≤10 ns/V) and output loading, not a system clock.
Is the 74ACT11245PWE4 compatible with 3.3 V logic inputs?
No - the 74ACT11245PWE4 requires 4.5–5.5 V supply and has TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). While 3.3 V logic HIGH may exceed VIH in some cases, it violates recommended operating conditions and risks marginal functionality. Use level shifters or 74LVC245 for guaranteed 3.3 V interoperability.
Does the 74ACT11245PWE4 support hot-swap operation?
The 74ACT11245PWE4 supports controlled hot-swap via its OE pin: asserting OE = HIGH places all A/B pins in high-impedance state before power-up or during insertion. However, it lacks built-in bus-hold or power-on reset circuitry, so external sequencing and current-limiting design are required for full hot-swap compliance.
What is the thermal resistance (θJA) of the 74ACT11245PWE4 in the PW package?
For the TSSOP-24 (PW) package, θJA is 120°C/W under standard JEDEC JESD51-2 conditions (single-layer 1-oz copper, 1 in² pad). This value is derived from the 0.7 W maximum power dissipation rating at TA = 55°C and junction temperature limit of 150°C, consistent with TI's published thermal characterization for PW-packaged ACT devices.
Can the 74ACT11245PWE4 be used for unidirectional data transfer?
Yes - tie DIR to a fixed logic level (e.g., VCC for A→B only or GND for B→A only) and control data flow exclusively via OE. This configures the 74ACT11245PWE4 as an octal 3-state buffer in either direction, simplifying control logic in applications requiring one-way isolation or expansion.
74ACT11245PWE4 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
74ACT11245PWE4 FAQ
1.How can I place an order for 74ACT11245PWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11245PWE4 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 74ACT11245PWE4 reliable?
The price and inventory of 74ACT11245PWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11245PWE4 is usually 5 days.
3.What payment methods are accepted for 74ACT11245PWE4?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11245PWE4?
74ACT11245PWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11245PWE4 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 74ACT11245PWE4?
For technical support, including 74ACT11245PWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11245PWE4 requirements.
6.How does Aetrix verify that 74ACT11245PWE4 is sourced from the original manufacturer or authorized distributors?
All 74ACT11245PWE4 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 74ACT11245PWE4 meets industry standards.
7.What is the process for return or replacement of 74ACT11245PWE4?
All 74ACT11245PWE4 units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11245PWE4, 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 74ACT11245PWE4 part is unused and in its original packaging.
Return procedure for 74ACT11245PWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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