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

Toshiba Semiconductor and Storage 74HC245D

Name: 74HC245D
Brand: Toshiba Semiconductor and Storage
SKU: 74HC245D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74HC245D

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: 74HC245D.pdf

Description:: IC TXRX NON-INVERT 6V 20SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74HC245D from Toshiba is a high-speed CMOS octal bus transceiver in SOIC-20 package, designed for bidirectional asynchronous data transfer between two 8-bit buses. It features direction control via DIR input, 3-state output enable/disable via G input, 10 ns typical propagation delay at 6.0 V, and operates across 2.0–6.0 V supply range - commonly used in microcontroller peripheral interfacing and legacy bus isolation.

For engineers reviewing the 74HC245D datasheet, 74HC245D pinout, 74HC245D application, or 74HC245D equivalent, key selection criteria include bidirectional 8-bit data flow control, wide V_CC tolerance, low quiescent current (≤4.0 µA), balanced t_PLH/t_PHL, and SOIC-20 thermal and layout compatibility.

Technical Context

The 74HC245D implements dual-bus bidirectional data routing using complementary CMOS logic with silicon gate C2MOS technology. Its DIR input selects transmission direction (A→B or B→A), while active-low G enables/disables all outputs into high-impedance state - enabling bus sharing without contention.

All inputs include ESD protection diodes; unused bus terminals require pull-up or pull-down resistors to avoid floating states. The device supports operation from −40 °C to +125 °C with guaranteed DC and AC performance across V_CC = 2.0–6.0 V, including 7.8 mA output drive capability at 6.0 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	74HC - high-speed CMOS compatible with LSTTL speed but CMOS power efficiency
Propagation Delay	10 ns (typ.) at V_CC = 6.0 V - enables reliable timing in 10–20 MHz bus systems
Supply Voltage Range	2.0 V to 6.0 V - supports mixed-voltage system interfacing (e.g., 3.3 V MCU ↔ 5 V peripheral)
Output Drive	±7.8 mA at V_CC = 6.0 V - sufficient to drive standard TTL loads or multiple CMOS inputs
Quiescent Current	≤4.0 µA at T_A = 25 °C - enables ultra-low-power standby in battery-backed systems
Operating Temperature	−40 °C to +125 °C - qualified for industrial and extended-temperature embedded applications
3-State Enable Time	14 ns (typ.) at V_CC = 6.0 V - ensures fast bus arbitration and minimal glitch window during direction switching

Pinout & Package

Package: SOIC-20 (Small Outline Integrated Circuit, 20-pin, 0.300″ body width, 0.025″ lead pitch). Weight: 0.51 g (typ.). RoHS-compliant per Toshiba documentation.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Active-low Output Enable	Drives all A/B outputs to high-impedance when HIGH; enables bidirectional transfer when LOW
2–9 (A0–A7)	Bus A Data Terminals	Input or output depending on DIR; connected to local bus (e.g., microcontroller side)
10 (GND)	Ground Reference	Common return path for all internal logic and I/O; must be low-impedance
11–18 (B0–B7)	Bus B Data Terminals	Input or output depending on DIR; connected to remote bus (e.g., peripheral or memory side)
19 (DIR)	Direction Control Input	LOW → A→B transfer; HIGH → B→A transfer; latched internally, no external clock required
20 (V_CC)	Positive Supply	Power rail for CMOS logic core and I/O buffers; bypass capacitor recommended near pin

Key Features

Feature	Design Value
Bidirectional Bus Isolation	Independent G and DIR controls allow dynamic bus arbitration and prevent contention during mode transitions
Wide-Voltage Operation	2.0–6.0 V supply range enables interoperability across 3.3 V and 5 V logic domains without level shifters
Low-Power 3-State Outputs	High-impedance leakage ≤0.1 µA ensures minimal loading on shared buses during disable
ESD-Protected Inputs	Integrated diode clamps protect against ±20 mA transient currents - reduces need for external TVS
Matched Propagation Delays	t_PLH ≈ t_PHL minimizes duty-cycle distortion in clocked data transfers and simplifies timing margin analysis

Applications

Microcontroller Peripheral Interface	Legacy System Bus Extension
Use Scenario: Interfacing an 8-bit microcontroller (e.g., ATmega128) with external parallel EEPROM or LCD controller. IC Role / Device Role / Timing Role: Bidirectional data buffer that isolates MCU address/data bus from peripheral during idle cycles and enables clean direction switching under software control. Use Value: Eliminates bus contention risk while supporting 10 ns timing margins - critical for reliable 8 MHz bus operation without added glue logic.	Use Scenario: Extending a vintage ISA or Z80-based system with additional I/O cards requiring isolated data paths. IC Role / Device Role / Timing Role: Octal transceiver providing direction-controlled data coupling between CPU bus and expansion slot, synchronized to /IOR and /IOW strobes. Use Value: Maintains signal integrity across longer traces with 7.8 mA drive strength and matched delays - avoids setup/hold violations in multi-card configurations.
Industrial PLC I/O Module	Test Equipment Signal Routing
Use Scenario: Isolating field-side digital I/O signals from controller-side logic in modular programmable logic controllers. IC Role / Device Role / Timing Role: Level-shifting and direction-gated interface between 24 V opto-isolated inputs and 3.3 V FPGA-based processing unit. Use Value: Wide V_CC range allows direct 3.3 V operation; −40 °C to +125 °C rating ensures reliability in uncontrolled cabinet environments.	Use Scenario: Reconfigurable signal path routing in automated test equipment (ATE) for DUT interface adaptation. IC Role / Device Role / Timing Role: Programmable bidirectional bus switch controlled by FPGA to route 8-bit stimulus/response data between test head and DUT pins. Use Value: 3-state enable/disable latency <15 ns allows sub-microsecond path reconfiguration - essential for high-throughput parametric testing.

Microcontroller Peripheral Interface

Legacy System Bus Extension

Use Scenario: Interfacing an 8-bit microcontroller (e.g., ATmega128) with external parallel EEPROM or LCD controller.

IC Role / Device Role / Timing Role: Bidirectional data buffer that isolates MCU address/data bus from peripheral during idle cycles and enables clean direction switching under software control.

Use Value: Eliminates bus contention risk while supporting 10 ns timing margins - critical for reliable 8 MHz bus operation without added glue logic.

Use Scenario: Extending a vintage ISA or Z80-based system with additional I/O cards requiring isolated data paths.

IC Role / Device Role / Timing Role: Octal transceiver providing direction-controlled data coupling between CPU bus and expansion slot, synchronized to /IOR and /IOW strobes.

Use Value: Maintains signal integrity across longer traces with 7.8 mA drive strength and matched delays - avoids setup/hold violations in multi-card configurations.

Industrial PLC I/O Module

Test Equipment Signal Routing

Use Scenario: Isolating field-side digital I/O signals from controller-side logic in modular programmable logic controllers.

IC Role / Device Role / Timing Role: Level-shifting and direction-gated interface between 24 V opto-isolated inputs and 3.3 V FPGA-based processing unit.

Use Value: Wide V_CC range allows direct 3.3 V operation; −40 °C to +125 °C rating ensures reliability in uncontrolled cabinet environments.

Use Scenario: Reconfigurable signal path routing in automated test equipment (ATE) for DUT interface adaptation.

IC Role / Device Role / Timing Role: Programmable bidirectional bus switch controlled by FPGA to route 8-bit stimulus/response data between test head and DUT pins.

Use Value: 3-state enable/disable latency <15 ns allows sub-microsecond path reconfiguration - essential for high-throughput parametric testing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HC245N	PDIP-20 package; identical electrical specs but higher thermal resistance and larger footprint	Suitable for prototyping or through-hole PCBs; not recommended for space-constrained or thermally demanding layouts	Select SN74HC245N only if manual assembly or breadboard evaluation is required - SOIC-20 offers superior thermal and density performance.
74HCT245D	TTL-compatible input thresholds (VIH = 2.0 V min); otherwise identical pinout, timing, and drive	Better suited for mixed 5 V TTL/CMOS systems where input noise margin must accommodate slower-rising signals	Choose 74HCT245D when interfacing with legacy 5 V TTL outputs; retain 74HC245D for pure CMOS or 3.3 V–5 V mixed systems with clean edges.

Compared with SN74HC245N and 74HCT245D, the 74HC245D delivers optimal thermal performance in surface-mount industrial designs, while its CMOS-input threshold provides tighter noise immunity in low-noise digital systems - making it the preferred choice for modern embedded bus isolation where board space and power efficiency are constrained.

Availability

74HC245D is available at Aetrix Electronics and suitable for microcontroller peripheral interface, industrial PLC I/O modules, legacy system bus extension, and automated test equipment signal routing requiring stable component supply and long-term industrial lifecycle support.

Supply support for 74HC245D 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

Toshiba Electronic Devices & Storage Corporation is a Japanese semiconductor manufacturer specializing in power devices, logic ICs, and memory solutions for industrial, automotive, and consumer applications.

The 74HC245D belongs to Toshiba's 74HC logic family - engineered for high-speed, low-power bidirectional data transfer in resource-constrained embedded systems where voltage flexibility and bus contention avoidance are critical.

FAQ

What is the maximum operating temperature for the 74HC245D?

The 74HC245D is rated for operation from −40 °C to +125 °C. This extended temperature range is verified per Toshiba's Rev. 3.0 datasheet and supports use in industrial control cabinets, motor drives, and outdoor electronics where ambient temperatures exceed standard commercial limits. The 74HC245D maintains full DC and AC specifications across this range.

Does the 74HC245D support 3.3 V operation?

Yes, the 74HC245D fully supports 3.3 V operation: its specified V_CC range is 2.0 V to 6.0 V, and all parameters - including VOH ≥ 3.7 V (min) and VOL ≤ 0.33 V (max) at I_OL = 6 mA - are guaranteed at 3.3 V. This makes the 74HC245D ideal for interfacing 3.3 V microcontrollers with 5 V peripherals.

How does the DIR pin control data flow direction in the 74HC245D?

In the 74HC245D, the DIR pin is a static logic input: when DIR = LOW, data flows from A-bus (pins 2–9) to B-bus (pins 11–18); when DIR = HIGH, data flows from B-bus to A-bus. Direction change occurs asynchronously with no clock or setup requirement - the 74HC245D updates output states within t_PLH/t_PHL after DIR transition.

What happens to the outputs when the G pin is HIGH on the 74HC245D?

When the active-low G pin is driven HIGH on the 74HC245D, all A- and B-bus outputs enter high-impedance (Hi-Z) state regardless of DIR or input levels. This electrically isolates both buses, preventing loading or contention. Output leakage remains ≤0.1 µA, ensuring minimal interference on shared lines during disable.

Is the 74HC245D pin-compatible with other 74HC245 variants?

Yes - the 74HC245D (SOIC-20) shares identical pinout and function with all industry-standard 74HC245 packages, including PDIP-20 (e.g., SN74HC245N) and TSSOP-20. Pin mapping, electrical behavior, and truth table are fully consistent; only package dimensions and thermal characteristics differ. No PCB redesign is needed when substituting within same package family.

74HC245D Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

Series:: 74HC

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

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:: 7.8mA, 7.8mA

Voltage - Supply:: 2V ~ 6V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74HC245D FAQ

1.How can I place an order for 74HC245D through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HC245D 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 74HC245D reliable?

The price and inventory of 74HC245D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC245D is usually 5 days.

3.What payment methods are accepted for 74HC245D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC245D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74HC245D?

74HC245D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HC245D 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 74HC245D?

For technical support, including 74HC245D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC245D requirements.

6.How does Aetrix verify that 74HC245D is sourced from the original manufacturer or authorized distributors?

All 74HC245D 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 74HC245D meets industry standards.

7.What is the process for return or replacement of 74HC245D?

All 74HC245D units undergo pre-shipment inspection (PSI). If there is an issue with 74HC245D, 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 74HC245D part is unused and in its original packaging.

Return procedure for 74HC245D:

1.Submit a request within 90 days.

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

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