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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments SN74BCT25245DW

Name: SN74BCT25245DW
Brand: Texas Instruments
SKU: SN74BCT25245DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74BCT25245DW

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 24-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74BCT25245DW.pdf

Description:: IC TXRX NON-INVERT 5.5V 24SOIC

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Product details

Overview

SN74BCT25245DW from Texas Instruments is a 25-Ω octal bus transceiver designed for asynchronous bidirectional data transfer between parallel buses in high-speed digital systems. It features 8-bit bidirectional data flow controlled by DIR and OE inputs, sinks up to 188 mA on the A port for incident-wave switching on 25-Ω transmission lines, operates at 4.5–5.5 V, and is rated for 0°C to 70°C ambient temperature.

For engineers reviewing the SN74BCT25245DW datasheet, SN74BCT25245DW pinout, SN74BCT25245DW application, or SN74BCT25245DW equivalent, key selection considerations include its 25-Ω line-driving capability, BiCMOS low-noise architecture with distributed V_CC/GND pins, 3.3 ns typical propagation delay (A→B), and SOIC-24 package compatibility with legacy 300-mil DIP footprints.

Technical Context

The SN74BCT25245DW implements a dual-rail BiCMOS output stage optimized for driving 25-Ω transmission lines using incident-wave switching-requiring precise output impedance matching and fast edge control. Its DIR input selects data direction (A→B or B→A), while OE enables full 3-state isolation of both buses simultaneously.

Distributed power/ground pin layout minimizes simultaneous switching noise (SSN), and ESD protection exceeds 2000 V (HBM) and 200 V (machine model). The device is not a level shifter: both A and B ports operate at the same V_CC supply (4.5–5.5 V) and share common logic thresholds (V_IL = 0.8 V, V_IH = 2.0 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage	4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS systems and stable operation across industrial voltage tolerances.
Output drive (A port, low)	188 mA - enables direct incident-wave switching on 25-Ω PCB traces without external termination resistors.
Propagation delay (A→B)	1.2–5.7 ns - supports >150 MHz bus toggle rates in point-to-point or short stub configurations.
Operating temperature	0°C to 70°C - qualified for commercial-grade embedded and industrial control applications.
Package	SOIC-24 (DW) - 300-mil width, tube-packaged, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
ESD rating	>2000 V HBM - exceeds MIL-STD-883C Method 3015, reducing risk of handling damage in assembly environments.
ICCZ (quiescent current)	12–16 mA - minimized via BiCMOS design to reduce standby power and local heating in dense bus interfaces.

Pinout & Package

SN74BCT25245DW uses a 24-pin SOIC (DW) package with 300-mil body width, gull-wing leads, and standard JEDEC MO-012AC outline. Pin 1 is marked by a beveled corner or dot; pin numbering follows counterclockwise order from top-left when viewed from top with marking side up.

Pin/Terminal	Circuit Role	Design Meaning
1 (A1)	A-side data input/output	Bi-directional I/O terminal for first bit of A bus; driven low to 0.7 V at 188 mA sink current.
2 (GND)	Ground reference	Dedicated ground pin adjacent to A1 to minimize return-path inductance for high-speed switching.
3 (A2)	A-side data input/output	Second A-bus bit; shares same electrical specs and drive strength as A1–A8.
4 (A3)	A-side data input/output	Third A-bus bit; part of 8-bit group with matched timing and impedance characteristics.
5 (GND)	Ground reference	Additional GND pin placed between A3/A4 to reduce crosstalk and SSN coupling across A-bus.
6 (A4)	A-side data input/output	Fourth A-bus bit; electrically identical to other A-port pins under all operating conditions.
7 (A5)	A-side data input/output	Fifth A-bus bit; supports full 188 mA sink capability and 3.3 ns t_PLH (A→B).
8 (GND)	Ground reference	Third dedicated GND pin near A5–A6; contributes to distributed grounding architecture.
9 (A6)	A-side data input/output	Sixth A-bus bit; maintains consistent VOL ≤ 0.7 V across full temperature range (0°C–70°C).
10 (A7)	A-side data input/output	Seventh A-bus bit; shares same input capacitance (18 pF) and IIH/IIL specs as all A/B ports.
11 (GND)	Ground reference	Fourth GND pin adjacent to A7/A8; critical for noise suppression during simultaneous A-port switching.
12 (A8)	A-side data input/output	Eighth and final A-bus bit; completes 8-bit transceiver channel with matched timing skew <0.5 ns.
13 (DIR)	Direction control input	Active-High signal determining data flow: DIR = H enables A→B; DIR = L enables B→A.
14 (B1)	B-side data input/output	First B-bus bit; outputs 24 mA max sink current (IOL) with VOL ≤ 0.5 V at 24 mA.
15 (B2)	B-side data input/output	Second B-bus bit; has lower drive strength than A port but optimized for stub-free routing.
16 (V_CC)	Power supply	Primary 4.5–5.5 V supply; second V_CC pin located at pin 20 to balance power distribution.
17 (B3)	B-side data input/output	Third B-bus bit; VOH ≥ 2.4 V at IOH = −3 mA, compatible with TTL and CMOS logic families.
18 (B4)	B-side data input/output	Fourth B-bus bit; includes internal clamp diodes supporting VI input range of −0.5 V to 5.5 V.
19 (B5)	B-side data input/output	Fifth B-bus bit; shares same 8 pF input capacitance and ±0.6 mA IIL/IIH specs as control inputs.
20 (V_CC)	Power supply	Secondary V_CC connection; reduces IR drop and improves transient response during multi-bit switching.
21 (B6)	B-side data input/output	Sixth B-bus bit; supports 20–24 mA sink current with guaranteed VOL ≤ 0.5 V over full temp range.
22 (B7)	B-side data input/output	Seventh B-bus bit; electrically isolated from A port when OE = H, with off-state leakage <±0.6 µA.
23 (B8)	B-side data input/output	Eighth B-bus bit; completes bidirectional 8-bit path with t_PHL(B→A) ≤ 7.2 ns max.
24 (OE)	Output enable input	Active-Low control: OE = L enables transceiver; OE = H places both A and B ports in high-impedance state.

Key Features

Feature	Design Value
25-Ω line driving	188-mA A-port sink current matches 25-Ω characteristic impedance for clean incident-wave signaling without reflections.
Distributed V_CC/GND	Four GND and two V_CC pins strategically placed to suppress simultaneous switching noise in multi-bit transitions.
BiCMOS process	Combines bipolar speed and CMOS low ICCZ (12–16 mA), reducing dynamic power and thermal load vs. pure bipolar.
High ESD robustness	2000-V HBM and 200-V machine-model ESD ratings eliminate need for external protection in most board-level designs.
Asynchronous bidirectional control	Independent DIR and OE inputs allow flexible bus arbitration, hot-swap isolation, and direction reversal without reset.

Applications

Backplane Data Routing	Memory Address Buffering
Use Scenario: High-density backplane interconnects between CPU and peripheral modules requiring low-skew, reflection-free data transfer over 25-Ω controlled-impedance traces. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing 8-bit address/data handshaking with sub-6 ns propagation delay and matched A/B timing. Use Value: Eliminates external series termination resistors and reduces trace discontinuities, enabling compact backplane layouts with deterministic signal integrity.	Use Scenario: Isolating and buffering memory address lines between microprocessor and SRAM/ROM banks in embedded controllers. IC Role / Device Role / Timing Role: 3-state address driver providing high-current sinking (188 mA) to meet fast address setup/hold requirements in 5-V systems. Use Value: Prevents address bus contention during DMA cycles and supports reliable read/write timing margins even with long trace runs.
Legacy Bus Interface Bridge	Industrial Control I/O Expansion
Use Scenario: Bridging legacy 8-bit parallel buses (e.g., ISA, PC/104) to modern FPGA or microcontroller peripherals with mismatched drive strengths. IC Role / Device Role / Timing Role: Level-consistent transceiver translating between different fanout loads while preserving signal rise/fall times. Use Value: Enables drop-in replacement of obsolete 74-series buffers without redesigning PCB layout or adding discrete termination networks.	Use Scenario: Expanding digital I/O capacity in programmable logic controllers (PLCs) where field wiring connects to 25-Ω twisted-pair or coaxial links. IC Role / Device Role / Timing Role: Robust bus interface IC with industrial-grade ESD tolerance and wide V_CC margin for noisy factory-floor environments. Use Value: Reduces susceptibility to EMI-induced glitches and extends mean time between failures in unshielded industrial enclosures.

Backplane Data Routing

Memory Address Buffering

Use Scenario: High-density backplane interconnects between CPU and peripheral modules requiring low-skew, reflection-free data transfer over 25-Ω controlled-impedance traces.

IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing 8-bit address/data handshaking with sub-6 ns propagation delay and matched A/B timing.

Use Value: Eliminates external series termination resistors and reduces trace discontinuities, enabling compact backplane layouts with deterministic signal integrity.

Use Scenario: Isolating and buffering memory address lines between microprocessor and SRAM/ROM banks in embedded controllers.

IC Role / Device Role / Timing Role: 3-state address driver providing high-current sinking (188 mA) to meet fast address setup/hold requirements in 5-V systems.

Use Value: Prevents address bus contention during DMA cycles and supports reliable read/write timing margins even with long trace runs.

Legacy Bus Interface Bridge

Industrial Control I/O Expansion

Use Scenario: Bridging legacy 8-bit parallel buses (e.g., ISA, PC/104) to modern FPGA or microcontroller peripherals with mismatched drive strengths.

IC Role / Device Role / Timing Role: Level-consistent transceiver translating between different fanout loads while preserving signal rise/fall times.

Use Value: Enables drop-in replacement of obsolete 74-series buffers without redesigning PCB layout or adding discrete termination networks.

Use Scenario: Expanding digital I/O capacity in programmable logic controllers (PLCs) where field wiring connects to 25-Ω twisted-pair or coaxial links.

IC Role / Device Role / Timing Role: Robust bus interface IC with industrial-grade ESD tolerance and wide V_CC margin for noisy factory-floor environments.

Use Value: Reduces susceptibility to EMI-induced glitches and extends mean time between failures in unshielded industrial 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
SN74ACT245N	CMOS-based, 50-Ω output impedance, lower IOL (24 mA), higher speed (t_PD ≈ 2.5 ns), no BiCMOS noise suppression.	Better for low-power, high-speed point-to-point links; unsuitable for 25-Ω incident-wave driving or high-noise environments.	Select when system uses 5-V CMOS logic and requires minimal ICC, but verify line impedance match and SSN sensitivity.
SN74LS245N	Bipolar TTL, 50-Ω output, IOL = 24 mA, slower (t_PD ≈ 12 ns), higher ICC, no distributed power/ground pins.	Compatible with legacy TTL systems only; lacks 25-Ω drive, ESD robustness, and noise immunity for modern backplanes.	Use only for cost-sensitive retrofits where performance and noise margins are non-critical and 5-V TTL compatibility is mandatory.

Compared with SN74ACT245N and SN74LS245N, the SN74BCT25245DW uniquely delivers 25-Ω line driving with BiCMOS noise control and industrial-grade ESD protection-making it the only option among the three qualified for reflection-sensitive, high-density bus routing without external components.

Availability

SN74BCT25245DW is available at Aetrix Electronics and suitable for backplane interconnects, memory subsystem buffering, legacy bus bridging, and industrial I/O expansion requiring stable component supply and long-term manufacturing continuity.

Supply support for SN74BCT25245DW 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74BCT25245DW belongs to TI's BCT (Bipolar-CMOS Transceiver) logic family, engineered specifically for high-speed, low-noise, 25-Ω transmission-line interfacing in commercial-grade computing and control systems.

FAQ

What is the maximum sink current capability of the SN74BCT25245DW A port?

The SN74BCT25245DW A port is specified to sink up to 188 mA per pin under recommended operating conditions (V_CC = 4.5 V, T_A = 0°C to 70°C). This current level is explicitly designed to drive 25-Ω transmission lines using incident-wave switching, ensuring clean signal edges without overshoot or reflection when properly terminated at the far end.

Does the SN74BCT25245DW support level shifting between different voltage domains?

No, the SN74BCT25245DW does not support level shifting. Both A and B ports operate from a single 4.5–5.5 V V_CC supply and share identical input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and output voltage ranges. It functions strictly as a bidirectional buffer within a common 5-V logic domain-not as a voltage translator.

What is the purpose of the multiple GND and V_CC pins on the SN74BCT25245DW?

The SN74BCT25245DW features four GND and two V_CC pins to minimize simultaneous switching noise (SSN) during multi-bit transitions. This distributed power/ground architecture reduces ground bounce and supply droop, improving signal integrity and timing predictability-especially critical in high-speed bus applications where multiple outputs switch concurrently.

Can the SN74BCT25245DW be used in place of the SN74LS245 in existing designs?

The SN74BCT25245DW is pin-compatible with the SN74LS245 in SOIC-24 (DW) and DIP-24 (NT) packages, but functional substitution requires validation. While both provide octal 3-state transceiver functionality, the SN74BCT25245DW offers superior 25-Ω drive, lower propagation delay (≤5.7 ns vs. ~12 ns), and higher ESD tolerance-making it suitable only if the PCB layout and signal integrity requirements align with its BiCMOS characteristics.

What is the meaning of "incident-wave switching" in the context of the SN74BCT25245DW?

Incident-wave switching refers to driving a transmission line with a source impedance matched to its characteristic impedance (25 Ω for the SN74BCT25245DW), so the initial voltage wave propagates cleanly without reflection. The SN74BCT25245DW achieves this via its 188-mA A-port sink strength, enabling reliable signaling on short, unterminated 25-Ω traces-common in backplanes and high-density interconnects.

SN74BCT25245DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74BCT

Package/Case:: 24-SOIC (0.295", 7.50mm Width)

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:: 80mA, 188mA; 3mA, 24mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-SOIC

SN74BCT25245DW FAQ

1.How can I place an order for SN74BCT25245DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74BCT25245DW 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 SN74BCT25245DW reliable?

The price and inventory of SN74BCT25245DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT25245DW is usually 5 days.

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Once your SN74BCT25245DW 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 SN74BCT25245DW?

For technical support, including SN74BCT25245DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT25245DW requirements.

6.How does Aetrix verify that SN74BCT25245DW is sourced from the original manufacturer or authorized distributors?

All SN74BCT25245DW 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 SN74BCT25245DW meets industry standards.

7.What is the process for return or replacement of SN74BCT25245DW?

All SN74BCT25245DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT25245DW, 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 SN74BCT25245DW part is unused and in its original packaging.

Return procedure for SN74BCT25245DW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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