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Texas Instruments SN74ABT245BPWR
- Part No.:
- SN74ABT245BPWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT245BPWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,597
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Product details
Overview
SN74ABT245BPWR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in 5-V TTL systems. It features high-drive capability (−32 mA IOH / 64 mA IOL), hot-insertion support via Ioff and power-up 3-state, and operates across −40°C to 85°C. Used in industrial backplane interfaces and legacy system upgrades requiring robust level-shifting and bus isolation.
For engineers reviewing the SN74ABT245BPWR datasheet, SN74ABT245BPWR pinout, SN74ABT245BPWR application, or SN74ABT245BPWR equivalent, key selection criteria include its TSSOP-20 package, 3.2 ns typical propagation delay, 0.55 V VOL at 64 mA, and compatibility with 5-V CMOS/TTL logic families in space-constrained board designs.
Technical Context
This device implements dual-directional 8-bit data routing controlled by DIR (direction) and OE (output enable) inputs. Its output structure supports true 3-state operation during power-up/down, preventing bus contention through active Ioff circuitry that disables outputs when VCC = 0 V.
The transceiver meets JEDEC JESD 17 latch-up immunity (>500 mA), exceeds JESD 22 ESD ratings (2000-V HBM, 200-V MM), and exhibits low ground bounce (<1 V VOLP at 5 V, 25°C), making it suitable for noise-sensitive mixed-signal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V supply tolerances in industrial power rails. |
| IOH / IOL | −32 mA / 64 mA - Delivers high-current drive for driving long traces or multiple TTL loads without external buffers. |
| tPLH / tPHL | 1 ns to 3.6 ns - Enables sub-4 ns bidirectional data transfer critical for high-speed parallel bus timing budgets. |
| VOL (IOL = 64 mA) | 0.55 V max - Guarantees solid logic-low margin under full-load conditions, reducing false triggering risk. |
| IOZ (3-state leakage) | ±10 μA max - Minimizes standby current in isolated bus segments, supporting low-power system sleep modes. |
| θJA (TSSOP) | 83°C/W - Defines thermal derating limit for continuous operation at ambient temperatures up to 85°C in standard PCB layouts. |
Pinout & Package
TSSOP-20 (PW) package: 4.4 mm × 6.5 mm body, 0.65 mm pitch, 1.2 mm max height, exposed pad not present. RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 inputs/outputs | Port A bidirectional data terminals - connect to source bus; direction determined by DIR state. |
| 9 | DIR | Direction control input - LOW enables B→A transfer; HIGH enables A→B transfer. |
| 10, 11, 12, 13, 14, 15, 16, 17 | B1–B8 inputs/outputs | Port B bidirectional data terminals - connect to destination bus; function mirrors A port. |
| 18 | OE | Output-enable active-low - HIGH forces all A/B pins into high-impedance state for bus isolation. |
| 19 | GND | Ground reference - must be connected to system common ground plane for signal integrity and ESD path. |
| 20 | VCC | Power supply - decoupling capacitor (0.1 µF ceramic) required within 3 mm of this pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ioff support | Enables hot insertion by disabling outputs when VCC = 0 V, preventing backflow current into powered subsystems. |
| Power-up 3-state | Automatically places outputs in high-Z during power ramp-up/down, eliminating bus conflicts without external sequencing. |
| High-drive outputs | −32 mA sink/source capability drives 20+ TTL loads or 50-Ω transmission lines directly, reducing component count. |
| Low ground bounce | <1 V VOLP at 5 V ensures clean switching edges and reduces crosstalk in dense PCB layouts. |
| Latch-up immunity | >500 mA per JEDEC JESD 17 - withstands transient overcurrent events in industrial environments. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Isolating CPU local bus from extended I/O backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data bridge between microcontroller address/data bus and peripheral expansion slots. Use Value: Enables hot-swap of I/O modules without resetting controller, leveraging Ioff and power-up 3-state for zero-downtime maintenance. | Use Scenario: Extending ISA or VMEbus signals across daughterboards in test equipment rack systems. IC Role / Device Role / Timing Role: Level-translating repeater for 5-V TTL signals across 15 cm inter-board traces. Use Value: 64 mA IOL drives long traces with <0.55 V VOL, maintaining noise margin despite trace capacitance and EMI exposure. |
| Embedded Controller Data Multiplexing | Test Fixture Signal Routing |
Use Scenario: Sharing a single 8-bit ADC interface between two microcontrollers in redundant safety systems. IC Role / Device Role / Timing Role: Direction-controlled multiplexer enabling time-shared access to shared analog front-end resources. Use Value: DIR and OE pins allow deterministic arbitration without software overhead; sub-4 ns propagation enables real-time sampling coordination. | Use Scenario: Reconfigurable signal path routing in automated test equipment (ATE) probe cards. IC Role / Device Role / Timing Role: Programmable bus switch isolating DUT signals from measurement instrumentation during calibration cycles. Use Value: ±10 μA 3-state leakage prevents loading of high-impedance sensor nodes; 2000-V HBM rating survives repeated probe contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | 3.3-V only supply (1.65–3.6 V); lower drive (−24/24 mA); 3.3-V logic compatible. | Suitable for modern low-voltage digital systems; not interoperable with 5-V buses without level shifting. | Select when interfacing with 3.3-V FPGAs or microcontrollers where 5-V tolerance is unnecessary. |
| SN74AHCT245PW | 5-V supply only; TTL-compatible inputs; slightly higher propagation delay (4.5 ns max); same pinout. | Direct drop-in replacement for SN74ABT245BPWR in cost-sensitive applications where 32/64 mA drive is not required. | Choose for legacy designs needing identical footprint and voltage range but relaxed drive/current specs. |
Compared with SN74LVC245APWR and SN74AHCT245PW, the SN74ABT245BPWR uniquely delivers 5-V operation with highest drive strength and lowest ground bounce-critical for noise-prone industrial backplanes where signal integrity outweighs voltage scalability.
Availability
SN74ABT245BPWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and embedded controller data multiplexing requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT245BPWR 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 connectivity technologies, with decades of experience in industrial-grade logic solutions.
The ABT family was engineered for high-noise industrial environments, delivering robust 5-V TTL-compatible transceivers with enhanced drive, ESD resilience, and hot-swap capability for mission-critical infrastructure.
FAQ
What is the maximum operating temperature range for SN74ABT245BPWR?
The SN74ABT245BPWR is rated for operation from −40°C to +85°C, making it suitable for industrial environments including factory automation, motor control cabinets, and outdoor telecom enclosures where ambient temperatures exceed commercial-grade limits. This range is validated per TI's recommended operating conditions and confirmed in the SCBS081L datasheet revision April 2005.
Does SN74ABT245BPWR support hot insertion, and how is it implemented?
Yes, SN74ABT245BPWR supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V to prevent damaging backflow current, and power-up 3-state forces outputs into high-impedance during power ramp-up/down. These functions are inherent to the silicon design and require no external components-confirmed in the "description/ordering information" section of the SCBS081L datasheet.
What is the pin configuration of SN74ABT245BPWR, and how does DIR control data flow?
SN74ABT245BPWR uses a TSSOP-20 package with pins 1–8 as A-port I/O, pins 10–17 as B-port I/O, pin 9 as DIR, pin 18 as OE, pin 19 as GND, and pin 20 as VCC. When DIR = LOW, data flows from B to A; when DIR = HIGH, data flows from A to B-verified in the FUNCTION TABLE and logic diagram of the SCBS081L datasheet.
Can SN74ABT245BPWR interface directly with 3.3-V logic devices?
No, SN74ABT245BPWR is a 5-V-only device with VIH = 2 V and VIL = 0.8 V, optimized for TTL/CMOS 5-V systems. While its inputs tolerate 3.3-V logic HIGH levels, its outputs swing rail-to-rail at 5 V and may overdrive 3.3-V inputs. For mixed-voltage systems, use a level-shifter such as TXS0108E or select SN74LVC245APWR instead.
What thermal considerations apply to SN74ABT245BPWR in continuous operation?
SN74ABT245BPWR has a junction-to-ambient thermal resistance (θJA) of 83°C/W in its TSSOP-20 (PW) package. At 85°C ambient and 30 mA ICC, junction temperature rises ~25°C above ambient-well within the 125°C absolute max. Maintain ≥1 cm² copper pour under the package and use ≥2 thermal vias to inner ground planes for sustained high-current operation.
SN74ABT245BPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ABT245BPWR FAQ
1.How can I place an order for SN74ABT245BPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT245BPWR 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 SN74ABT245BPWR reliable?
The price and inventory of SN74ABT245BPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT245BPWR is usually 5 days.
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Once your SN74ABT245BPWR 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 SN74ABT245BPWR?
For technical support, including SN74ABT245BPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT245BPWR requirements.
6.How does Aetrix verify that SN74ABT245BPWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT245BPWR 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 SN74ABT245BPWR meets industry standards.
7.What is the process for return or replacement of SN74ABT245BPWR?
All SN74ABT245BPWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT245BPWR, 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 SN74ABT245BPWR part is unused and in its original packaging.
Return procedure for SN74ABT245BPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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