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

onsemi MC74F245DWR2

Name: MC74F245DWR2
Brand: onsemi
SKU: MC74F245DWR2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74F245DWR2

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: MC74F245DWR2.pdf

Description:: BUS TRANSCEIVER, F/FAST SERIES,

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MC74F245DWR2 from ON Semiconductor is an octal noninverting bidirectional transceiver with 3-state inputs/outputs, designed for TTL bus interfacing. It supports bidirectional data flow between two 8-bit buses (A0–A7 and B0–B7), features 64 mA sink capability on B ports, 24 mA on A ports, and operates at 5 V with propagation delay ≤7.0 ns (74F grade). It is used in industrial backplane bus arbitration and legacy microprocessor system expansion.

For engineers reviewing the MC74F245DWR2 datasheet, pinout, applications, or equivalent options, key selection criteria include direction control via T/R pin, high-current B-port drive, 3-state output enable timing (tPZH ≤9.0 ns), and SOIC-20 package compatibility with legacy FAST TTL systems.

Technical Context

The MC74F245DWR2 implements eight independent bidirectional buffer channels controlled by a single Transmit/Receive (T/R) input: T/R = HIGH enables A→B data transfer; T/R = LOW enables B→A transfer. Output Enable (OE) is active-HIGH and places both A and B ports in high-impedance state when asserted.

It uses FAST Schottky TTL logic with guaranteed operation from 0°C to +70°C, 4.5 V to 5.5 V supply, and meets ESD >4000 V (HBM). DC parameters are specified for both A and B ports separately - notably higher sink current (64 mA) and lower VOL (0.55 V) on B outputs versus A outputs (24 mA, 0.5 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 bus systems and tolerates rail variation without functional loss.
Propagation Delay (An↔Bn)	≤7.0 ns max at TA = 0°C to +70°C - enables reliable operation in high-speed 8-bit data transfers up to ~140 MHz effective throughput.
B-Port Sink Current	64 mA - drives heavy capacitive loads or multiple TTL inputs without external buffering in bus termination scenarios.
A-Port Sink Current	24 mA - sufficient for standard TTL fan-out (10x) on A-side connections, matching legacy LS TTL drive strength.
Output Disable Time (tPLZ/tPHZ)	≤7.5 ns max - critical for glitch-free bus switching during direction or enable transitions in time-multiplexed architectures.
ESD Rating	>4000 V HBM - provides robust handling margin during board assembly and field service in industrial environments.

Pinout & Package

MC74F245DWR2 is housed in a 20-pin SOIC package (Case 751D-03, DW suffix), with 1.27 mm pitch, body width 7.5 mm, and JEDEC MS-013 compliant footprint.

Pin/Terminal	Circuit Role	Design Meaning
1	OE (Output Enable)	Active-HIGH control: asserts high-Z on all A/B ports when HIGH - essential for bus contention avoidance in multi-driver systems.
2–9, 18–19	A0–A7 / B0–B7	Two independent 8-bit bidirectional I/O banks - A side typically connects to CPU/local bus; B side to peripheral/expansion bus.
10	GND	Ground reference for all logic and output stages - must be low-inductance connection to minimize ground bounce in high-current switching.
11	VCC	+5 V power supply - requires local 0.1 µF ceramic decoupling adjacent to pin to suppress FAST TTL transient current spikes.
12	T/R (Transmit/Receive)	Direction control: HIGH = A→B; LOW = B→A - synchronizes with CPU RD/WR strobes or DMA controller handshaking signals.

Key Features

Feature	Design Value
Bidirectional data path per channel	Enables shared bus architecture without separate transmit/receive ICs - reduces component count and PCB area in 8-bit microcontroller systems.
Asymmetric output drive (64 mA B / 24 mA A)	Optimizes drive strength where B-side interfaces with longer traces or higher fan-out peripherals, while A-side matches CPU port loading.
Guaranteed 3-state timing (tPZH ≤9.0 ns)	Ensures predictable bus release timing for arbitration protocols like IEEE 1149.1 boundary-scan or custom bus masters.
FAST Schottky TTL logic family	Delivers speed/power balance superior to LS TTL (e.g., 74LS245) with compatible voltage thresholds - allows drop-in replacement in existing designs.

Applications

Industrial Backplane Bus Arbitration	Legacy Microprocessor System Expansion
Use Scenario: Multiple plug-in cards share a common 8-bit data bus in a ruggedized PLC chassis, requiring dynamic direction control and hot-swap isolation. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow between CPU card and I/O modules under T/R and OE control. Use Value: 64 mA B-port sink current drives long backplane traces with 50–100 pF load; tPLZ ≤7.5 ns prevents metastability during rapid direction reversal.	Use Scenario: Z80 or 8085-based development system adds memory-mapped peripherals via a 20-pin ribbon cable interface. IC Role / Device Role / Timing Role: Level-shifting and bus-driving transceiver between CPU address/data bus and peripheral ASIC or EPROM bank. Use Value: 24 mA A-port drive matches Z80 bus loading specs; SOIC-20 footprint fits compact prototyping layouts without adapter boards.
Test Equipment Data Capture Interface	Automated Test Fixture Signal Routing
Use Scenario: Digital pattern generator routes stimulus signals to DUT pins while capturing response on same lines using shared test head cabling. IC Role / Device Role / Timing Role: Reconfigurable signal path element enabling simultaneous stimulus application and response sampling on identical pins. Use Value: Guaranteed VOL ≤0.55 V at 64 mA ensures clean logic-low detection even under heavy probe capacitance (≥100 pF).	Use Scenario: Modular ATE fixture switches between multiple DUT types using programmable direction control and bus isolation. IC Role / Device Role / Timing Role: Isolation gate and direction manager between controller FPGA and DUT-specific signal banks. Use Value: High-Z state (IOZL ≤–650 µA) prevents leakage-induced false reads during fixture reconfiguration sequences.

Industrial Backplane Bus Arbitration

Legacy Microprocessor System Expansion

Use Scenario: Multiple plug-in cards share a common 8-bit data bus in a ruggedized PLC chassis, requiring dynamic direction control and hot-swap isolation.

IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow between CPU card and I/O modules under T/R and OE control.

Use Value: 64 mA B-port sink current drives long backplane traces with 50–100 pF load; tPLZ ≤7.5 ns prevents metastability during rapid direction reversal.

Use Scenario: Z80 or 8085-based development system adds memory-mapped peripherals via a 20-pin ribbon cable interface.

IC Role / Device Role / Timing Role: Level-shifting and bus-driving transceiver between CPU address/data bus and peripheral ASIC or EPROM bank.

Use Value: 24 mA A-port drive matches Z80 bus loading specs; SOIC-20 footprint fits compact prototyping layouts without adapter boards.

Test Equipment Data Capture Interface

Automated Test Fixture Signal Routing

Use Scenario: Digital pattern generator routes stimulus signals to DUT pins while capturing response on same lines using shared test head cabling.

IC Role / Device Role / Timing Role: Reconfigurable signal path element enabling simultaneous stimulus application and response sampling on identical pins.

Use Value: Guaranteed VOL ≤0.55 V at 64 mA ensures clean logic-low detection even under heavy probe capacitance (≥100 pF).

Use Scenario: Modular ATE fixture switches between multiple DUT types using programmable direction control and bus isolation.

IC Role / Device Role / Timing Role: Isolation gate and direction manager between controller FPGA and DUT-specific signal banks.

Use Value: High-Z state (IOZL ≤–650 µA) prevents leakage-induced false reads during fixture reconfiguration sequences.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional bus transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74F245N	Dual-in-line (PDIP-20) package; identical electrical specs and pinout; slightly higher ICCZ (120 mA vs. 110 mA).	Preferred for through-hole prototyping or legacy repair; lacks SOIC thermal performance for sustained 64 mA operation.	Select SN74F245N only when manual soldering or socket-based testing is required.
74ACT245PW	Advanced CMOS (ACT) family; 5 V tolerant, 24 mA drive both sides; 3.3 V compatible inputs; tPLH ≤6.5 ns.	Suitable for mixed-voltage systems; lower power (ICCZ ≈ 10 µA) but no 64 mA B-port drive.	Choose 74ACT245PW when interfacing with 3.3 V logic or when ultra-low standby current is critical.

Compared with SN74F245N and 74ACT245PW, the MC74F245DWR2 uniquely delivers 64 mA B-port sink capability in a surface-mount SOIC package, making it optimal for industrial backplanes where high-current bus driving and space-constrained layouts coexist.

Availability

MC74F245DWR2 is available at Aetrix Electronics and suitable for industrial backplane bus arbitration, legacy microprocessor system expansion, and automated test fixture signal routing requiring stable component supply across extended lifecycle programs.

Supply support for MC74F245DWR2 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

ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, and cloud infrastructure markets.

The MC74F245DWR2 belongs to ON Semiconductor's FAST TTL logic product line, engineered for high-speed, noise-immune digital interfacing in mission-critical industrial and test equipment where reliability and legacy compatibility are mandatory.

FAQ

What is the maximum operating temperature range for the MC74F245DWR2?

The MC74F245DWR2 is rated for operation from 0°C to +70°C ambient temperature, consistent with the 74F logic family specification. This range is validated per the Guaranteed Operating Ranges table in the official ON Semiconductor datasheet, and does not extend to the military-grade –55°C to +125°C range of the MC54F245 variant. Thermal derating is not required within this envelope.

Does the MC74F245DWR2 support true bidirectional operation on each pin pair?

Yes, the MC74F245DWR2 supports true bidirectional data flow per channel (A0↔B0 through A7↔B7), controlled exclusively by the T/R input. When T/R = HIGH, data flows A→B; when T/R = LOW, data flows B→A. Both directions maintain full 3-state control via OE, and no internal direction latching or clocking is involved - operation is purely combinatorial.

What is the output disable time (tPLZ/tPHZ) specification for the MC74F245DWR2?

The MC74F245DWR2 has a maximum output disable time of 7.5 ns (tPLZ and tPHZ) at TA = 0°C to +70°C and CL = 50 pF. This value is measured from OE transition to valid high-Z state and is critical for preventing bus contention during rapid enable/disable cycles in real-time control systems.

Can the MC74F245DWR2 be used with 3.3 V logic systems?

No, the MC74F245DWR2 is a 5 V-only FAST TTL device. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output voltage levels (VOH ≥2.7 V, VOL ≤0.55 V) are specified only for VCC = 4.5–5.5 V operation. Direct connection to 3.3 V logic risks undriven inputs or excessive current injection; level translation is required.

Is the MC74F245DWR2 pin-compatible with the SN74F245N?

Yes, the MC74F245DWR2 and SN74F245N share identical pin functions and ordering logic (DW = SOIC, N = PDIP), including OE, T/R, VCC, GND, and all A/B port assignments. The only physical difference is package type - SOIC-20 vs. PDIP-20 - so PCB layout differs, but schematic symbol and netlist mapping are fully interchangeable.

MC74F245DWR2 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

MC74F245DWR2 FAQ

1.How can I place an order for MC74F245DWR2 through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74F245DWR2 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 MC74F245DWR2 reliable?

The price and inventory of MC74F245DWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74F245DWR2 is usually 5 days.

3.What payment methods are accepted for MC74F245DWR2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74F245DWR2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74F245DWR2?

MC74F245DWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74F245DWR2 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 MC74F245DWR2?

For technical support, including MC74F245DWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74F245DWR2 requirements.

6.How does Aetrix verify that MC74F245DWR2 is sourced from the original manufacturer or authorized distributors?

All MC74F245DWR2 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 MC74F245DWR2 meets industry standards.

7.What is the process for return or replacement of MC74F245DWR2?

All MC74F245DWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74F245DWR2, 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 MC74F245DWR2 part is unused and in its original packaging.

Return procedure for MC74F245DWR2:

1.Submit a request within 90 days.

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

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