My Inquiry
My Account
Texas Instruments SN74BCT25245NT
- Part No.:
- SN74BCT25245NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74BCT25245NT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,016
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74BCT25245NT from Texas Instruments is a 25-Ω octal bus transceiver designed for asynchronous bidirectional data transfer between A and B buses in high-speed digital systems. It features 3-state outputs, 188-mA sink capability on the A port, 24-pin plastic DIP (NT) package, and operates from 0°C to 70°C with 4.5 V–5.5 V supply. It enables incident-wave switching on 25-Ω transmission lines in memory address and clock driver applications.
For engineers reviewing the SN74BCT25245NT datasheet, SN74BCT25245NT pinout, SN74BCT25245NT application, or SN74BCT25245NT equivalent, key selection criteria include 25-Ω line driving capability, dual-direction control via DIR/OE, distributed power/ground pin layout for noise reduction, and compatibility with TTL-level logic interfaces in legacy industrial and computing bus architectures.
Technical Context
The SN74BCT25245NT implements BiCMOS circuitry to achieve low ICCZ (12–16 mA) while delivering high-current drive: 188-mA IOL on A port and 24-mA IOL on B port at VCC = 4.5 V. Its DIR input selects data flow direction (A→B or B→A), while OE enables full 3-state isolation of both buses.
Designed specifically for incident-wave switching on ≥25-Ω transmission lines, it uses distributed VCC and GND pins across the 24-pin NT package to minimize simultaneous switching noise. Propagation delays range from 1.2 ns (tPLH) to 7.2 ns (tPLZ) under 50-pF load conditions, supporting reliable operation in synchronous and asynchronous bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and BCT logic families without level-shifting. |
| A-port low-level output current | 188 mA - enables direct incident-wave switching on 25-Ω PCB traces or backplanes without external buffers. |
| B-port low-level output current | 24 mA - supports termination and fanout to standard TTL loads on the B-side interface. |
| Propagation delay (A→B) | 1.2–5.7 ns - guarantees sub-6-ns timing margin for high-speed bus arbitration and data capture. |
| Operating temperature | 0°C to 70°C - qualified for commercial-grade embedded systems, industrial controllers, and legacy computing equipment. |
| ESD protection | >2000 V HBM - provides robust handling safety during manual assembly and board-level integration. |
| Package type | 24-pin plastic DIP (NT) - through-hole mounting compatible with wave soldering and legacy prototyping workflows. |
Pinout & Package
SN74BCT25245NT is housed in a 24-pin plastic dual in-line package (DIP), designated NT by Texas Instruments. The package features through-hole leads, 0.6-inch body width, and standard 0.1-inch pin pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A1) | A-bus data input/output | Bi-directional I/O terminal for first bit of A bus; driven low to 0.7 V at 188 mA sink. |
| 2 (GND) | Ground reference | Dedicated ground pin adjacent to A1 to reduce local switching noise coupling into A-bus signals. |
| 3 (A2) | A-bus data input/output | Second A-bus bit; shares same drive strength and 3-state behavior as A1–A8 group. |
| 12 (A8) | A-bus data input/output | Last A-bus bit; electrically identical to A1–A7 with matched propagation delay and loading. |
| 13 (DIR) | Direction control input | Active-High signal selecting A→B (DIR = H) or B→A (DIR = L); TTL-compatible threshold (VIL ≤ 0.8 V). |
| 14 (B1) | B-bus data input/output | First B-bus bit; sinks 24 mA max, supports 2.4 V VOH at 3 mA load for TTL interfacing. |
| 24 (OE) | Output enable input | Active-Low control disabling all A/B outputs into high-impedance state; critical for bus arbitration. |
| 23 (B8) | B-bus data input/output | Last B-bus bit; matches B1–B7 in timing, voltage thresholds, and current drive capability. |
| 22 (VCC) | Power supply | Primary 4.5–5.5 V supply connection; multiple VCC pins (e.g., Pin 22, Pin 16) reduce IR drop and switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω transmission line drive | 188-mA A-port sink current enables clean incident-wave switching on controlled-impedance PCB traces without overshoot. |
| Distributed VCC/GND pin layout | Multiple power/ground pins interleaved across package reduce simultaneous switching noise by >30% vs. single-point supply. |
| BiCMOS process technology | Combines bipolar speed and CMOS low quiescent current (ICCZ = 12–16 mA), improving system power efficiency. |
| TTL-compatible interface levels | VIH = 2 V, VIL = 0.8 V, VOH ≥ 2.4 V (B port), VOL ≤ 0.5 V - ensures seamless integration with legacy 5-V logic systems. |
| Full military-grade ESD protection | Exceeds 2000 V per MIL-STD-883C Method 3015 - eliminates need for external ESD clamps in board-level design. |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
|
Use Scenario: Driving multiplexed address lines from a microprocessor to multiple banks of SRAM or EPROM in a 16-bit embedded controller. IC Role / Device Role / Timing Role: Bidirectional address transceiver isolating CPU and memory domains while maintaining signal integrity over 25-Ω trace routing. Use Value: 188-mA A-port drive ensures fast edge rates and minimal reflection on long address buses, reducing setup/hold timing violations. |
Use Scenario: Distributing a master clock signal to multiple synchronous peripherals (e.g., UARTs, timers) across a PCB with varying trace lengths. IC Role / Device Role / Timing Role: Unidirectional clock driver (A→B mode) with matched propagation delay and low skew across all eight outputs. Use Value: Sub-6-ns tPLH/tPHL variation across channels maintains <100-ps inter-channel skew, preserving clock domain coherence. |
| Legacy Bus Arbitration Interface | Industrial Backplane Interconnect |
|
Use Scenario: Enabling shared access to a parallel data bus among multiple microcontrollers in an industrial PLC rack using DIR/OE handshaking. IC Role / Device Role / Timing Role: 3-state bidirectional transceiver implementing bus ownership negotiation via hardware-controlled direction and enable signals. Use Value: Fast OE-controlled output disable (tPZL = 3.3–8.3 ns) allows rapid bus release, minimizing arbitration latency in real-time control loops. |
Use Scenario: Interfacing a CPU module to a passive backplane carrying multiple peripheral cards with impedance-matched stubs. IC Role / Device Role / Timing Role: Point-to-point 25-Ω line driver/receiver supporting hot-swap-capable backplane communication with noise-immune signaling. Use Value: Distributed VCC/GND pins suppress ground bounce during multi-bit transitions, preventing false reads on adjacent backplane slots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74BCT244N | Unidirectional (A→Y only), no DIR pin; 16-pin PDIP; 64-mA A-port sink. | Lacks bidirectional capability and 25-Ω line drive; suitable only for one-way buffering where direction is fixed. | Select when bus direction is static and lower drive strength suffices; not interchangeable with SN74BCT25245NT due to pin count and function mismatch. |
| SN74ACT245N | CMOS-based, 50-Ω drive, 24-pin PDIP; 24-mA IOL on both ports; 4.5–5.5 V supply. | Lower drive strength and no incident-wave optimization; better for general-purpose 3-state bus isolation than transmission-line matching. | Choose for lower power consumption and improved noise immunity in non-critical timing paths; requires redesign for 25-Ω line termination. |
Compared with SN74BCT25245NT, SN74BCT244N omits bidirectionality and high-current drive, limiting use to static bus extensions, while SN74ACT245N trades line-driving capability for lower ICC and broader noise margin-neither offers drop-in replacement capability due to functional and electrical divergence.
Availability
SN74BCT25245NT is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial backplanes, and legacy bus arbitration requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT25245NT 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT25245NT belongs to TI's BCT (Bipolar-CMOS Transceiver) logic family, engineered for high-speed, high-drive 5-V bus interfacing in systems demanding incident-wave signal integrity and noise-resilient operation.
FAQ
What is the maximum sink current capability of the A port on the SN74BCT25245NT?
The A port of the SN74BCT25245NT delivers up to 188 mA of low-level output current (IOL) at VCC = 4.5 V and TA = 25°C. This high sink strength enables direct incident-wave switching on 25-Ω transmission lines without external drivers. The SN74BCT25245NT maintains this rating across its full commercial temperature range (0°C to 70°C), making it suitable for demanding industrial bus applications where signal fidelity is critical.
Does the SN74BCT25245NT support bidirectional data flow, and how is direction controlled?
Yes, the SN74BCT25245NT supports true bidirectional data transfer between the A and B buses. Direction is controlled by the DIR input: when DIR = LOW, data flows from B to A; when DIR = HIGH, data flows from A to B. This logic-level control is fully compatible with standard TTL signaling, and the SN74BCT25245NT retains precise timing symmetry (tPLH ≈ tPHL) in both directions, ensuring deterministic bus arbitration.
What package type does the SN74BCT25245NT use, and is it through-hole mountable?
The SN74BCT25245NT uses a 24-pin plastic dual in-line package (PDIP), designated NT by Texas Instruments. It is a through-hole component with 0.1-inch pin spacing and 0.6-inch body width, fully compatible with wave soldering, manual prototyping, and legacy socket-based designs. The NT package includes dedicated GND and VCC pins distributed across the body to minimize switching noise-a key feature confirmed in the device's absolute maximum ratings and recommended operating conditions tables.
How does the SN74BCT25245NT manage noise during simultaneous output switching?
The SN74BCT25245NT minimizes noise during simultaneous switching via a distributed VCC and GND pin architecture-multiple power and ground connections are interleaved across the 24-pin NT package to reduce common-impedance coupling and ground bounce. This layout, explicitly cited in the device's functional description and absolute maximum ratings, lowers peak supply current transients by distributing return paths, resulting in more stable bus operation in dense, high-speed digital systems using the SN74BCT25245NT.
What are the absolute maximum voltage ratings for inputs and outputs of the SN74BCT25245NT?
The SN74BCT25245NT has an absolute maximum supply voltage (VCC) of −0.5 V to 7 V. Input voltage limits are −0.5 V to 7 V for control inputs (DIR, OE) and −0.5 V to 5.5 V for I/O ports (A1–A8, B1–B8). Output voltage in the disabled or power-off state must remain within −0.5 V to 5.5 V, while high-state B-port outputs are limited to −0.5 V to VCC. These ratings are defined in the official SCBS053B datasheet and apply directly to the SN74BCT25245NT in its NT package configuration.
SN74BCT25245NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- 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:
- 80mA, 188mA; 3mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74BCT25245NT FAQ
1.How can I place an order for SN74BCT25245NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT25245NT 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 SN74BCT25245NT reliable?
The price and inventory of SN74BCT25245NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT25245NT is usually 5 days.
3.What payment methods are accepted for SN74BCT25245NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT25245NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT25245NT?
SN74BCT25245NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT25245NT 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 SN74BCT25245NT?
For technical support, including SN74BCT25245NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT25245NT requirements.
6.How does Aetrix verify that SN74BCT25245NT is sourced from the original manufacturer or authorized distributors?
All SN74BCT25245NT 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 SN74BCT25245NT meets industry standards.
7.What is the process for return or replacement of SN74BCT25245NT?
All SN74BCT25245NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT25245NT, 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 SN74BCT25245NT part is unused and in its original packaging.
Return procedure for SN74BCT25245NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74BCT25245NT Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
