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Texas Instruments SN74ABT245BN
- Part No.:
- SN74ABT245BN
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT245BN.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:453
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Product details
Overview
SN74ABT245BN from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial control and embedded systems. It features high-drive outputs (−32 mA IOH, 64 mA IOL), supports hot insertion via Ioff and power-up 3-state, and operates across −40°C to 85°C at 4.5–5.5 V supply.
For engineers reviewing the SN74ABT245BN datasheet, SN74ABT245BN pinout, SN74ABT245BN application, or SN74ABT245BN equivalent, this device is selected for robust level-shifting, bus isolation, and noise-immune digital interface design where ground bounce <1 V and latch-up immunity >500 mA are critical.
Technical Context
The SN74ABT245BN implements dual-directional 8-bit data flow controlled by DIR (direction) and OE (output enable) inputs. Its TTL-compatible logic thresholds (VIH = 2 V, VIL = 0.8 V) ensure interoperability with legacy 5-V systems, while its Ioff circuitry actively disables outputs during power-down to prevent backflow current.
Propagation delays are tightly specified: tPLH/tPHL ≤ 3.9 ns (max) at 5 V, CL = 50 pF; enable/disable times (tPZL/tPHZ) range from 1.5 ns to 6.2 ns. The device meets JEDEC JESD 17 latch-up standards and exceeds JESD 22 ESD ratings (2000-V HBM, 200-V MM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across industrial 5-V rail tolerances |
| High-Level Output Current | −32 mA - drives heavy capacitive loads or multiple TTL inputs without signal degradation |
| Low-Level Output Current | 64 mA - sustains strong sink capability for pull-down dominance in shared-bus arbitration |
| Propagation Delay | ≤3.9 ns max - enables high-speed synchronous bus handshaking up to ~250 MHz effective throughput |
| Input Clamp Current | −18 mA - protects internal circuitry against transient overvoltage on control pins |
| Thermal Resistance θJA | 69°C/W (PDIP-N) - defines maximum power dissipation margin under natural convection cooling |
| ESD Protection | 2000-V HBM - meets industrial IEC 61000-4-2 system-level surge immunity requirements |
Pinout & Package
SN74ABT245BN uses a 20-pin plastic dual in-line package (PDIP-N) with 0.3-inch body width and through-hole mounting. Pin 1 is located at the top-left corner adjacent to the notch or dot index area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW routes B→A, HIGH routes A→B |
| 2–9 | A1–A8 | Bus A data inputs/outputs - bidirectional port connected to microcontroller or FPGA side |
| 10 | GND | Ground reference - must be low-impedance connection to minimize ground bounce |
| 11–18 | B1–B8 | Bus B data inputs/outputs - bidirectional port connected to peripheral or memory side |
| 19 | VCC | Positive supply - decoupling capacitor (0.1 µF ceramic) required within 1 cm |
| 20 | OE | Output enable: LOW enables transceiver, HIGH forces all outputs to high-impedance state |
Key Features
| Feature | Design Value |
|---|---|
| Hot-insertion support | Ioff and power-up 3-state eliminate bus contention during live board insertion or power sequencing |
| High-drive output capability | −32 mA source / +64 mA sink enables direct drive of 10+ TTL loads without buffers |
| Low ground bounce | VOLP <1 V at 5 V - maintains signal integrity in noisy industrial environments |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD17 - prevents destructive latch-up under fault conditions |
| TTL-compatible input thresholds | VIH = 2 V, VIL = 0.8 V - ensures reliable interfacing with legacy 5-V logic families |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Bus Expansion |
|---|---|
Use Scenario: Isolating CPU address/data bus from modular I/O cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling real-time read/write access to distributed analog/digital modules. Use Value: High-drive outputs maintain signal integrity across 20-cm backplane traces; Ioff prevents damage during hot-swap of I/O cards. | Use Scenario: Extending 8-bit data bus of 8051 or Z80-based embedded controller to external SRAM or peripherals. IC Role / Device Role / Timing Role: Level-translating and direction-controlled data bridge between MCU and memory-mapped devices. Use Value: 3.9 ns max propagation delay supports 25-MHz bus clocking; 3-state isolation prevents bus contention during DMA cycles. |
| Test Equipment Digital I/O Module | Automated Test Fixture Signal Routing |
Use Scenario: Routing stimulus/response signals between DUT interface and pattern generator in ATE systems. IC Role / Device Role / Timing Role: Programmable direction bus switch enabling flexible signal path configuration. Use Value: OE-controlled high-impedance state allows safe reconfiguration without powering down; VOLP <1 V ensures clean edge fidelity for timing-critical measurements. | Use Scenario: Multiplexing test signals across multiple DUT sockets using shared resource lines. IC Role / Device Role / Timing Role: Isolation gate preventing crosstalk between parallel test channels during concurrent execution. Use Value: Latch-up immunity >500 mA withstands accidental shorts during probe contact; 2000-V HBM protects against operator ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245BDW | SOIC-20 package (DW), same electrical specs, lower θJA (58°C/W) | Suitable for surface-mount PCBs requiring higher thermal efficiency and smaller footprint | Select when automated assembly and improved thermal performance outweigh through-hole mechanical robustness |
| SN74ABT245BNSR | SOP-20 package (NS), identical logic behavior, RoHS-compliant NIPDAU finish | Preferred for cost-sensitive consumer electronics with space-constrained layouts | Choose for high-volume production where tape-and-reel packaging and lead-free compliance are mandatory |
Compared with SN74ABT245BDW and SN74ABT245BNSR, the SN74ABT245BN offers mechanical stability and serviceability in prototyping and field-replaceable modules, while maintaining full functional equivalence and identical timing/electrical performance across all three variants.
Availability
SN74ABT245BN is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microcontroller bus expansion, and automated test equipment requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT245BN 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 for industrial, automotive, and communications markets.
The SN74ABT245B product line delivers high-speed, robust bus interface ICs optimized for noise-tolerant 5-V digital systems requiring hot-swap capability and high-current drive.
FAQ
What is the maximum operating temperature range for the SN74ABT245BN?
The SN74ABT245BN is rated for operation from −40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in factory automation, motor control cabinets, and outdoor instrumentation enclosures where thermal cycling and extended temperature exposure occur. The PDIP-N package's 69°C/W θJA allows sustained operation at full load within this envelope under natural convection.
How does the SN74ABT245BN support hot insertion in backplane systems?
The SN74ABT245BN supports hot insertion through two integrated features: Ioff circuitry disables outputs when VCC = 0 V, preventing damaging current backflow during partial power-up; and power-up 3-state logic holds all outputs in high-impedance until VCC stabilizes. These functions are intrinsic to the SN74ABT245BN silicon design and require no external components-only proper OE pull-up resistor selection per TI application note SCBA004.
What are the absolute maximum voltage ratings for SN74ABT245BN inputs and outputs?
The SN74ABT245BN has an absolute maximum supply voltage of −0.5 V to +7 V. Input voltage range is −0.5 V to +7 V (except I/O ports), and output voltage in high or power-off state is limited to −0.5 V to +5.5 V. Exceeding these values risks permanent damage. These ratings are defined in the official SN74ABT245BN datasheet (SCBS081L, Rev. April 2005) and apply specifically to the PDIP-N variant.
Can SN74ABT245BN interface directly with 3.3-V logic systems?
The SN74ABT245BN is a 5-V-only device and is not 3.3-V tolerant. Its VIH minimum is 2.0 V and VIL maximum is 0.8 V, but inputs must be driven from 5-V logic levels to guarantee correct switching. Direct connection to 3.3-V CMOS outputs risks marginal high-level recognition and increased static power consumption. For mixed-voltage systems, use a dedicated level translator such as TXB0108 alongside the SN74ABT245BN.
What is the recommended pull-up resistor value for OE on SN74ABT245BN?
Texas Instruments specifies that OE should be tied to VCC through a pull-up resistor to ensure high-impedance state during power-up. The minimum resistor value is determined by the driver's current-sinking capability; for standard 5-V TTL drivers, 4.7 kΩ is commonly used. This value ensures OE remains above 2 V (VIH) while limiting current to <1 mA, preserving noise margins and avoiding excessive loading on the control line driving OE.
SN74ABT245BN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ABT245BN FAQ
1.How can I place an order for SN74ABT245BN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT245BN 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 SN74ABT245BN reliable?
The price and inventory of SN74ABT245BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT245BN is usually 5 days.
3.What payment methods are accepted for SN74ABT245BN?
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SN74ABT245BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT245BN 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 SN74ABT245BN?
For technical support, including SN74ABT245BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT245BN requirements.
6.How does Aetrix verify that SN74ABT245BN is sourced from the original manufacturer or authorized distributors?
All SN74ABT245BN 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 SN74ABT245BN meets industry standards.
7.What is the process for return or replacement of SN74ABT245BN?
All SN74ABT245BN units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT245BN, 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 SN74ABT245BN part is unused and in its original packaging.
Return procedure for SN74ABT245BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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