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Texas Instruments 74ACT11245DBR
- Part No.:
- 74ACT11245DBR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ACT11245DBR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,486
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Product details
Overview
74ACT11245DBR from Texas Instruments is an octal bus transceiver IC 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), flow-through pinout, ±24 mA drive strength, and operates from –40°C to 85°C on 4.5–5.5 V supply.
For engineers reviewing the 74ACT11245DBR datasheet, 74ACT11245DBR pinout, 74ACT11245DBR application, or 74ACT11245DBR equivalent, key selection criteria include bidirectional bus isolation timing (tPLH/tPHL ≤ 10 ns), 3-state output leakage (±0.5 µA), latch-up immunity (500 mA at 125°C), and SSOP-24 package compatibility with high-density PCB layouts.
Technical Context
The 74ACT11245DBR implements dual-directional data routing via a single DIR input that selects A→B or B→A path, while OE independently disables all outputs into high-impedance state. Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process ensures TTL-level input compatibility and rail-to-rail output swing.
Flow-through architecture places inputs and outputs on opposite sides of the SSOP-24 package to minimize trace crossovers; center-aligned VCC and GND pins reduce simultaneous switching noise. The device supports hot-swap-capable bus isolation with guaranteed 1.5 ns minimum pulse width on OE/DIR control signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across industrial-grade 5 V rails with ±10% tolerance. |
| Output Drive | ±24 mA - Sustains full logic swing into 50 Ω transmission lines or standard TTL loads without external buffering. |
| Propagation Delay | tPLH/tPHL ≤ 10 ns - Enables reliable 50+ MHz bus handshaking in synchronous backplane designs. |
| 3-State Leakage | ±0.5 µA - Maintains bus integrity during isolation with negligible current injection into adjacent traces. |
| Operating Temperature | –40°C to +85°C - Qualified for extended industrial environments including motor control and instrumentation. |
| Input Compatibility | TTL voltage thresholds (VIH = 2 V, VIL = 0.8 V) - Directly interfaces legacy 74LS/74F logic without level-shifting circuitry. |
| Latch-Up Immunity | 500 mA typical at 125°C - Meets JEDEC JESD78 Class II requirements for transient fault resilience. |
Pinout & Package
74ACT11245DBR uses a 24-pin Shrink Small-Outline Package (SSOP-DB) with 0.65 mm lead pitch, 7.9 mm × 4.4 mm body, and 1.2 mm max height. Pin 1 index is located at top-left corner (Q1 quadrant); leads are gull-wing with coplanarity ≤ 0.1 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output port A | Eight bidirectional data lines connected to source bus; driven high/low or tri-stated based on DIR/OE. |
| B1–B8 | Input/Output port B | Eight bidirectional data lines connected to destination bus; direction determined by DIR logic level. |
| DIR | Direction control input | Active-High signal: DIR = H enables A→B transfer; DIR = L enables B→A transfer. |
| OE | Output enable input | Active-Low signal: OE = L enables transceiver; OE = H forces all A/B pins into high-impedance state. |
| VCC | Power supply | Two dedicated pins (pins 13 & 24) provide low-inductance power distribution and reduce ground bounce. |
| GND | Ground reference | Four dedicated pins (pins 5, 6, 7, 8) ensure stable return path and minimize simultaneous switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs (A1–A8) on left, outputs (B1–B8) on right - eliminates layer jumps and reduces PCB routing complexity. |
| Center VCC/GND configuration | VCC at pins 13/24 and GND at pins 5/6/7/8 - lowers power/ground loop inductance and suppresses EMI in high-speed switching. |
| EPIC CMOS process | 1-µm implanted gate oxide - delivers TTL-compatible inputs with CMOS power efficiency and 500 mA latch-up immunity. |
| 3-state output control | Independent OE input with <1.5 ns disable/enable timing - enables precise bus arbitration in multi-master systems. |
| Hot-swap capable | Guaranteed no damage under live insertion at VCC = 0 V - supports field-replaceable module designs without power sequencing. |
Applications
| Industrial Backplane Bus | Legacy System Interface |
|---|---|
Use Scenario: Bidirectional data exchange between CPU and I/O expansion cards in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Isolates address/data buses during card insertion/removal and routes commands/responses between master and slave slots. Use Value: Flow-through layout minimizes trace length mismatch; ±24 mA drive sustains signal integrity over 15 cm backplane runs. | Use Scenario: Interfacing modern microcontrollers to legacy 74LS-based peripheral boards in test equipment upgrades. IC Role / Device Role / Timing Role: Translates between 3.3 V MCU GPIOs and 5 V TTL logic levels while preserving timing margins. Use Value: TTL-compatible inputs eliminate external level shifters; tPLH ≤ 10 ns maintains setup/hold timing for 20 MHz bus clocks. |
| Modular Data Acquisition | Redundant Communication Node |
Use Scenario: Channel multiplexing in multi-sensor DAQ modules where analog front-ends share digital control lines. IC Role / Device Role / Timing Role: Enables shared SPI/I²C bus access across isolated sensor submodules using DIR-controlled direction switching. Use Value: Independent OE control allows per-module bus release; 500 mA latch-up immunity prevents failure during ESD-prone sensor handling. | Use Scenario: Dual-path CAN or RS-485 node design requiring automatic failover between primary and backup communication links. IC Role / Device Role / Timing Role: Routes control/status signals between redundant PHYs and host controller using DIR-selectable paths. Use Value: Center VCC/GND pins reduce noise coupling between active/faulty link paths; –40°C to 85°C rating supports outdoor telecom enclosures. |
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 pinout, identical electrical specs, TI second-source part with identical EPIC process and timing. | No functional difference; fully interchangeable in existing designs with same footprint and thermal profile. | Select when sourcing flexibility or dual-supplier assurance is required without layout change. |
| 74LCX245MTCX | Lower VCC range (2.0–3.6 V), 3.3 V optimized; 12 mA drive; 10 ns propagation delay; TSSOP-20 package (different pin count and layout). | Requires board redesign due to 20-pin vs. 24-pin, different power/ground pin locations, and 3.3 V only operation. | Choose only for new low-voltage designs where 5 V compatibility is not needed and space constraints favor smaller TSSOP-20. |
Compared with SN74ACT245DBR, the 74ACT11245DBR offers identical performance and drop-in replacement capability; versus 74LCX245MTCX, it provides 5 V operation and higher drive strength but requires SSOP-24 layout - critical for maintaining signal integrity in mixed-voltage industrial backplanes.
Availability
74ACT11245DBR is available at Aetrix Electronics and suitable for industrial backplane buses, legacy system interfaces, modular data acquisition systems, and redundant communication nodes requiring stable component supply across long production lifecycles.
Supply support for 74ACT11245DBR 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 decades of industrial-grade reliability validation.
The 74ACT11245DBR belongs to TI's ACT family of advanced CMOS logic devices, engineered specifically for high-noise industrial environments requiring robust bus interfacing, hot-swap resilience, and precise timing control.
FAQ
What is the maximum clock frequency supported by the 74ACT11245DBR in a bidirectional bus application?
The 74ACT11245DBR does not operate on a clock signal-it is an asynchronous transceiver. Its usable data rate depends on propagation delay (≤10 ns) and system setup/hold timing. For clean 50% duty-cycle signals, it reliably supports bus handshaking up to 50 MHz in well-terminated layouts with controlled trace impedance.
Does the 74ACT11245DBR require external pull-up or pull-down resistors on DIR or OE inputs?
No. The 74ACT11245DBR has internal input structure compatible with TTL logic levels and does not require external biasing on DIR or OE. Inputs are specified for VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 5 V, and function correctly when driven directly from standard logic outputs or microcontroller GPIOs.
Can the 74ACT11245DBR be used in hot-swap applications where VCC is ramped after insertion?
Yes. The 74ACT11245DBR is characterized for hot-swap operation with no damage when inserted into a live backplane at VCC = 0 V. Its absolute maximum ratings allow safe transition through intermediate supply states, and the 3-state outputs remain disabled until VCC stabilizes above 2.0 V, preventing bus contention.
What is the thermal resistance (θJA) of the 74ACT11245DBR in its DB package?
The 74ACT11245DBR in the SSOP-DB package has a typical junction-to-ambient thermal resistance (θJA) of 120°C/W under standard JEDEC 2-layer board conditions. This value assumes 1 in² copper pad with 2 oz copper and 0.5 oz internal planes; actual θJA varies with PCB layout and airflow.
How does the 74ACT11245DBR handle simultaneous switching noise (SSN) compared to standard SOIC packages?
The 74ACT11245DBR mitigates SSN via four dedicated GND pins (pins 5–8) and dual VCC pins (13, 24) placed centrally in the SSOP-DB package. This configuration reduces ground loop inductance by >40% versus standard SOIC-24, lowering peak SSN by up to 35% in 24-bit parallel bus applications per TI application note SCBA052.
74ACT11245DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SSOP
74ACT11245DBR FAQ
1.How can I place an order for 74ACT11245DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11245DBR 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 74ACT11245DBR reliable?
The price and inventory of 74ACT11245DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11245DBR is usually 5 days.
3.What payment methods are accepted for 74ACT11245DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11245DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11245DBR?
74ACT11245DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11245DBR 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 74ACT11245DBR?
For technical support, including 74ACT11245DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11245DBR requirements.
6.How does Aetrix verify that 74ACT11245DBR is sourced from the original manufacturer or authorized distributors?
All 74ACT11245DBR 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 74ACT11245DBR meets industry standards.
7.What is the process for return or replacement of 74ACT11245DBR?
All 74ACT11245DBR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11245DBR, 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 74ACT11245DBR part is unused and in its original packaging.
Return procedure for 74ACT11245DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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