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Texas Instruments SN74ABTH245N
- Part No.:
- SN74ABTH245N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABTH245N.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:800
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Product details
Overview
SN74ABTH245N 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 and embedded systems. It features high-drive outputs (–32 mA IOH, 64 mA IOL), bus-hold circuitry eliminating external pull resistors, and Ioff support for hot insertion. Operates from –40°C to 85°C with 4.5 V to 5.5 V supply.
For engineers reviewing the SN74ABTH245N datasheet, SN74ABTH245N pinout, SN74ABTH245N application, or SN74ABTH245N equivalent, this page delivers verified electrical specs, thermal performance (69°C/W θJA), direction-control logic behavior, and real-world isolation timing (tPZH up to 6.2 ns) critical for bus arbitration and power sequencing design.
Technical Context
The SN74ABTH245N implements EPIC-IIB BiCMOS architecture to reduce power dissipation while maintaining TTL-compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V). Its dual control inputs-DIR (direction) and OE (output enable)-define four functional states: A→B transmission, B→A transmission, high-impedance isolation, and power-up safe 3-state.
Bus-hold circuitry actively maintains valid logic levels on floating A/B inputs (II(hold) = ±100 µA at VI = 2 V), and Ioff protection limits reverse current to ±100 µA when VCC = 0 V-enabling live insertion into powered backplanes without damaging signal integrity or upstream drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5-V TTL and mixed-voltage system rails. |
| Output Drive | –32 mA IOH / 64 mA IOL - drives heavy capacitive loads (e.g., long traces, multiple inputs) without signal degradation. |
| Propagation Delay | tPLH/tPHL ≤ 3.9 ns (VCC = 5 V, TA = 25°C) - supports >200 MHz bus toggle rates in synchronous designs. |
| Thermal Resistance | θJA = 69°C/W (PDIP-N package) - defines maximum power dissipation before thermal derating in still-air PCB environments. |
| Operating Temperature | –40°C to +85°C - qualified for commercial/industrial ambient conditions, excluding extended military range. |
| Input Clamp Current | IIK = –18 mA - protects against negative transients below GND without external diodes. |
| Bus-Hold Current | II(hold) = ±100 µA - sustains stable logic state on unterminated data lines, reducing board-level component count. |
Pinout & Package
SN74ABTH245N uses a 20-pin plastic dual in-line package (PDIP-N), 7.62 mm pitch, 26.16 mm body length, 6.35 mm width, and 4.57 mm height. Pin 1 is marked by a notch or dot; device orientation follows standard DIP top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Low = B→A data flow; High = A→B data flow - determines physical bus directionality in real time. |
| 2–9 (A1–A8) | Data Inputs/Outputs (A-side) | Bidirectional port connected to local subsystem bus; held at valid logic level via internal bus-hold if floating. |
| 10 (GND) | Ground Reference | Primary return path for all I/O and core logic; must be low-inductance connection to minimize ground bounce (VOLP < 1 V). |
| 11 (VCC) | Power Supply | +5 V supply rail; decoupling capacitor required within 1 cm to suppress switching noise and ensure stable 3-state transitions. |
| 12–19 (B1–B8) | Data Inputs/Outputs (B-side) | Bidirectional port linked to remote or peripheral bus; electrically isolated from A-side when OE = High. |
| 20 (OE) | Output Enable Input | Low = outputs active; High = all A/B pins enter high-impedance state - enables bus sharing and conflict-free multi-driver arbitration. |
Key Features
| Feature | Design Value |
|---|---|
| Hot-Insertion Support | Ioff and power-up 3-state prevent backflow current and driver contention during live board insertion into powered systems. |
| Bus-Hold Circuitry | Eliminates need for 10-kΩ external pullup/pulldown resistors on A/B data lines - reduces BOM cost and layout area. |
| High-Drive Outputs | –32 mA source / 64 mA sink capability drives 2–3 standard TTL loads or ≥15 pF trace capacitance without slew rate degradation. |
| Output Ground Bounce | VOLP < 1 V at VCC = 5 V, TA = 25°C - ensures clean low-level signaling even under fast switching across multiple outputs. |
| Latch-Up Immunity | Exceeds 500 mA per JESD17 - withstands transient overcurrent events without destructive latch-up in noisy industrial environments. |
Applications
| Industrial PLC Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Interfacing microcontroller-based I/O modules to a centralized 8-bit parallel backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data bridge enabling read/write access between CPU and distributed I/O cards; DIR selects master-slave direction per transaction. Use Value: Bus-hold eliminates termination resistors on 20+ cm backplane traces; high drive strength maintains signal integrity across 10+ nodes. |
Use Scenario: Extending aging ISA or STD bus architectures with new peripheral cards while preserving legacy controller firmware. IC Role / Device Role / Timing Role: Level-shifting and isolation transceiver between original 5-V bus and upgraded add-on modules operating at same voltage. Use Value: 3.9 ns max propagation delay meets ISA timing budgets; OE-controlled isolation prevents bus contention during card hot-swap. |
| Test Equipment Data Acquisition Interface | Automated Test Fixture Signal Routing |
Use Scenario: Routing sensor data from multiple analog front-ends through a multiplexed digital bus to a central FPGA acquisition engine. IC Role / Device Role / Timing Role: Synchronized data aggregator that buffers and forwards time-stamped samples from eight parallel channels. Use Value: Ioff protection allows safe reconfiguration of signal paths while test head remains powered; VOLP < 1 V ensures accurate LSB capture. |
Use Scenario: Reconfigurable signal routing matrix in semiconductor ATE fixtures where DUT interface pins are dynamically assigned. IC Role / Device Role / Timing Role: Programmable bus switch controlled by fixture controller to connect selected DUT pins to measurement instruments. Use Value: 69°C/W θJA enables continuous operation in enclosed test enclosures; DIR/OE dual control permits flexible path definition in software. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Lower voltage operation (1.65–3.6 V), CMOS process, 24 mA drive, no bus-hold or Ioff. | Suitable only for 3.3-V or mixed-voltage systems; requires external termination and lacks hot-swap safety. | Select when migrating to low-voltage logic; avoid in legacy 5-V or hot-plug environments. |
| 74ACT245 | Same 5-V operation, TTL-compatible, 24 mA drive, no bus-hold, higher ICC (30 mA), no Ioff. | Compatible pinout but lacks bus-hold and hot-insertion features; higher static power draw. | Use where cost is primary constraint and bus termination is already implemented externally. |
Compared with SN74LVC245A and 74ACT245, the SN74ABTH245N uniquely combines 5-V robustness, integrated bus-hold, Ioff-enabled hot insertion, and industry-standard PDIP packaging-making it irreplaceable in legacy industrial upgrades requiring zero hardware redesign.
Availability
SN74ABTH245N is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-lifecycle support, and RoHS-compliant PDIP packaging.
Supply support for SN74ABTH245N 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 ABTH logic family was engineered for high-noise industrial backplanes and hot-swappable modular systems-delivering robust 5-V TTL interoperability with advanced BiCMOS power efficiency and bus integrity features.
FAQ
What is the maximum output current rating for SN74ABTH245N?
The SN74ABTH245N supports –32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) under recommended operating conditions. These values are specified at VCC = 4.5 V and TA = 25°C, and define the device's ability to drive heavy capacitive or resistive loads without violating VOH ≥ 2 V or VOL ≤ 0.55 V. Exceeding these ratings risks parametric shift or thermal stress in sustained operation.
Does SN74ABTH245N support hot insertion, and how is it implemented?
Yes, SN74ABTH245N supports hot insertion via two integrated mechanisms: Ioff circuitry disables outputs when VCC = 0 V, limiting reverse current to ±100 µA, and power-up 3-state forces outputs into high-impedance during VCC ramp-up (0–2.1 V). This prevents damaging current backflow and bus conflicts when the device is inserted into a live 5-V backplane-critical for modular industrial systems.
What is the function of the DIR and OE pins on SN74ABTH245N?
DIR (pin 1) controls data direction: logic Low enables B→A transfer; logic High enables A→B transfer. OE (pin 20) controls output state: logic Low activates drivers; logic High places all A/B pins in high-impedance isolation. Together, they implement four discrete states-two active bidirectional modes and two isolation modes-enabling flexible bus arbitration in shared-data architectures.
Can SN74ABTH245N operate with a 3.3-V supply?
No, SN74ABTH245N is specified only for 4.5 V to 5.5 V operation. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are optimized for 5-V TTL compatibility. Applying 3.3 V violates recommended operating conditions and may result in undefined logic states, insufficient noise margin, or failure to meet VOL/VOLP specifications. For 3.3-V systems, consider SN74LVC245A instead.
What package type does SN74ABTH245N use, and what are its key mechanical dimensions?
SN74ABTH245N uses a 20-pin plastic dual in-line package (PDIP-N) per JEDEC MS-013. Key dimensions: 26.16 mm length, 6.35 mm width, 4.57 mm height, 2.54 mm lead pitch, and 0.51 mm lead thickness. The package is RoHS-compliant with NiPdAu lead finish and rated for wave soldering and hand assembly-ideal for through-hole prototyping and legacy manufacturing.
SN74ABTH245N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABTH
- 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
SN74ABTH245N FAQ
1.How can I place an order for SN74ABTH245N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABTH245N 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 SN74ABTH245N reliable?
The price and inventory of SN74ABTH245N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABTH245N is usually 5 days.
3.What payment methods are accepted for SN74ABTH245N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABTH245N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABTH245N?
SN74ABTH245N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABTH245N 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 SN74ABTH245N?
For technical support, including SN74ABTH245N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABTH245N requirements.
6.How does Aetrix verify that SN74ABTH245N is sourced from the original manufacturer or authorized distributors?
All SN74ABTH245N 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 SN74ABTH245N meets industry standards.
7.What is the process for return or replacement of SN74ABTH245N?
All SN74ABTH245N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABTH245N, 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 SN74ABTH245N part is unused and in its original packaging.
Return procedure for SN74ABTH245N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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