MIC5891YN

Overview

The MIC5891YN is an 8-bit serial-input latched source driver manufactured by Microchip Technology. It integrates eight CMOS data latches, control circuitry for common STROBE and OUTPUT ENABLE signals, and bipolar Darlington transistor drivers for each latch. The device features a 1:8 input-to-output ratio with high-side output configuration. It supports a load voltage range of 5V to 50V and operates on a supply voltage between 4.5V and 15V. The maximum output current per channel is 500mA. The component is housed in a 16-pin PDIP package and is rated for an operating temperature range of -55°C to 125°C.

Feature Summary

• Integrates eight CMOS data latches with dedicated bipolar Darlington transistor drivers for high-current switching capability.
• Features a single serial input interface that shifts data into the internal latches upon strobe activation.
• Provides independent control over all outputs via a common OUTPUT ENABLE signal for synchronized operation.
• Supports high-voltage loads up to 50V with a wide operating temperature range suitable for industrial environments.

Applications

• Driving high-current loads such as solenoids, relays, and lamps in industrial automation systems.
• Acting as a load switch or driver in printer mechanisms and office equipment.
• Controlling multiple peripheral devices in embedded systems requiring serial data expansion.
• Power distribution management in automotive applications where high-side switching is required.

Procurement Notes

Verify the package type carefully, as the MIC5891 series includes both surface-mount (SOIC) and through-hole (PDIP) variants. Ensure the specific suffix matches the required mounting style for your PCB design. Confirm the manufacturer origin, noting that Microchip acquired Micrel, which may affect part marking or documentation sources. Check RoHS compliance status if environmental regulations are a constraint for your project.

Selection Notes

Select this component when a single serial line needs to control multiple high-current outputs independently. It is suitable for designs requiring high-side switching with integrated latching functionality to maintain state without continuous power. Consider the 500mA per-channel limit and the 50V maximum load voltage when sizing the driver for specific loads. Ensure the serial interface timing meets the system's clock requirements for reliable data shifting.

Part Context

The MIC5891 belongs to a family of latched drivers designed for expanding digital outputs in microcontroller-based systems. Originally developed by Micrel Semiconductor before its acquisition by Microchip Technology, it remains a standard solution for driving heavy loads from low-power logic. The device simplifies circuit design by combining logic, latching, and power driving stages into a single integrated circuit.

Replacement Considerations

Direct substitutes include other 8-bit serial latched drivers from Microchip or compatible manufacturers. Verify pin compatibility and electrical specifications such as current rating and voltage limits before substitution. Cross-reference datasheets to ensure equivalent performance in terms of propagation delay and output configuration.

FAQ

What is the maximum load voltage supported by the MIC5891YN?

The MIC5891YN supports a load voltage range of 5V to 50V.

How many outputs does the MIC5891YN provide?

The device provides eight independent outputs, controlled by a single serial input.

Is the MIC5891YN available in a surface-mount package?

Yes, the MIC5891 series includes surface-mount versions such as the MIC5891YWM, while the MIC5891YN is the through-hole PDIP variant.