M74HCT245B1R

Overview

The M74HCT245B1R is an octal bus transceiver with 3-state outputs manufactured using silicon gate C2MOS technology. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature from -55 °C to 125 °C. The device features a typical propagation delay of 13 ns at 4.5 V, with balanced tPLH and tPHL timings. Quiescent supply current is limited to a maximum of 4 μA at 25 °C. Outputs provide a minimum drive capability of 6 mA for both high and low states. The component is housed in a Plastic DIP-20 package.

Feature Summary

• Provides two-way asynchronous communication between data buses with direction controlled by the DIR input.
• Outputs are effectively isolated when the enable input G is set to a high state.
• Inputs include protection circuits against static discharge and transient excess voltage.

Applications

• Two-way asynchronous communication between data buses
• Bus-oriented transfer applications

Procurement Notes

Verify that the ordering suffix B1R corresponds specifically to the DIP-20 package as indicated in the official STMicroelectronics datasheet. Confirm the manufacturer is STMicroelectronics. Ensure the component meets the specified -55 °C to 125 °C operating temperature range and 4.5 V to 5.5 V supply voltage requirements for your application.

Selection Notes

Select this component for designs requiring an octal bus transceiver compatible with the 74 series 245 pinout. It is suitable for mixed 5 V and 3.3 V applications due to TTL-compatible inputs. Consider the DIP-20 package if through-hole mounting is required. Verify that the 6 mA output drive capability meets the load requirements of the connected circuitry.

Part Context

This part belongs to the M74HCT245 family of advanced high-speed CMOS octal bus transceivers. It is functionally equivalent to standard 74HC245 devices but utilizes HCT logic levels for TTL compatibility. The B1R suffix denotes the specific tape and reel packaging format for the DIP-20 variant.

Replacement Considerations

Functionally compatible parts include the M74HCT245M1R (SOP-20) and M74HCT245TTR (TSSOP-20). Other manufacturers' 74HCT245 variants may be used if pinouts and electrical specifications match.