MIC74BQS Equivalent & Substitute Parts

Part Overview

The MIC74BQS is an 8-channel I/O expander interface component manufactured by Microchip Technology, designed for I2C and SMBus communication at 100 kHz clock frequency. This device features open drain and push-pull output types with fan speed controller capabilities, operating across a 2.7V to 3.6V supply voltage range and -40°C to 85°C temperature range.

The MIC74BQS is currently discontinued at DiGi Electronics. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Substiute Parts

MIC74BQS

Microchip TechnologyIn Stock: 3031MIC74BQS Datasheet

Current PartRFQ

MIC74YQS

Microchip TechnologyIn Stock: 19549MIC74YQS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MIC74BQS are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Parameters for Substitution:

• Number of I/O channels: 8
• Interface protocol: I2C, SMBus
• Clock frequency: 100 kHz
• Supply voltage range: 2.7V ~ 3.6V
• Operating temperature range: -40°C ~ 85°C
• Output type: Open Drain, Push-Pull
• Current output specifications: 7mA, 10mA
• Package type: 16-SSOP
• Interrupt output capability: Yes
• Fan speed controller feature: Yes

The MIC74YQS meets all electrical and mechanical parameters specified for the MIC74BQS, making it a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The MIC74YQS is a direct electrical and mechanical equivalent to the MIC74BQS. Both parts share identical functional specifications, pin configurations, and performance characteristics across all critical parameters.

A key distinction exists in regulatory compliance: the MIC74YQS carries ROHS3 compliance status, whereas the MIC74BQS is RoHS non-compliant. For applications subject to RoHS requirements or environmental regulations, the MIC74YQS provides superior compliance posture.

Both parts are classified as obsolete or discontinued, indicating limited future availability. Component selection should prioritize current inventory status and lead time requirements for production planning.

Frequently Asked Questions (FAQ)

Q: Can the MIC74YQS directly replace the MIC74BQS in existing designs?

A: Yes. The MIC74YQS is electrically and mechanically identical to the MIC74BQS. All functional parameters, pin assignments, voltage specifications, and interface protocols are equivalent. No design modifications are required for substitution.

Q: What is the difference between the MIC74BQS and MIC74YQS?

A: The primary difference is packaging and regulatory compliance. The MIC74BQS is supplied in bulk packaging with RoHS non-compliant status. The MIC74YQS is supplied in tube packaging and carries ROHS3 compliance certification. Electrical and functional specifications are identical.

Q: Are there any temperature or voltage operating differences?

A: No. Both parts operate identically across the -40°C to 85°C temperature range and 2.7V to 3.6V supply voltage range. Output current specifications (7mA, 10mA) and clock frequency (100 kHz) are identical.

Q: Does the package type affect PCB layout or assembly?

A: No. Both parts use the 16-SSOP package with identical dimensions (0.154", 3.90mm width). PCB footprints, assembly processes, and thermal characteristics remain unchanged.

Q: Which part should be selected for new designs?

A: For new designs, the MIC74YQS is the preferred selection due to ROHS3 compliance and current obsolete status classification. However, both parts are subject to limited availability. Inventory verification and lead time assessment are necessary before final component selection.