ZM331643C Equivalent & Substitute Parts

Part Overview

The ZM331643C is a supervisor integrated circuit from Diodes Incorporated designed for power management applications. It functions as a simple reset/power-on reset device with open drain or open collector output, monitoring a single voltage threshold. The device is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The MC33164P-3RAG from onsemi serves as the manufacturer-recommended substitute, offering active product status with compatible electrical and mechanical specifications.

Substiute Parts

ZM331643C

Diodes IncorporatedIn Stock: 1112ZM331643C Datasheet

Current PartRFQ

MC33164P-3RAG

onsemiIn Stock: 2106MC33164P-3RAG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ZM331643C is determined by the following critical parameters:

• Functional Type: Simple Reset/Power-On Reset supervisor with single voltage monitoring
• Output Configuration: Open Drain or Open Collector topology
• Reset Logic: Active Low operation
• Package Compatibility: TO-92-3 / TO-226-3 through-hole form factor
• Voltage Threshold: Nominal 2.68V monitoring point
• Operating Temperature: Minimum -40°C to 85°C range
• Regulatory Compliance: ROHS3 compliance and EAR99 classification

The MC33164P-3RAG meets all substitution criteria through equivalent functional architecture, compatible output stage, matching reset polarity, and identical package designation. Threshold voltage variance (2.71V vs. 2.68V) remains within acceptable tolerance for supervisor applications. Extended operating temperature range (-40°C to 125°C) of the substitute provides enhanced thermal margin.

Parameter Comparison

Engineering Selection Recommendations

The MC33164P-3RAG is the designated substitute for ZM331643C applications based on the following engineering criteria:

Functional Equivalence: Both devices implement identical supervisor architecture with single-channel voltage monitoring, active-low reset output, and open drain/open collector topology.

Regulatory Compliance: Both parts maintain ROHS3 compliance and EAR99 classification, ensuring continued adherence to environmental and export control requirements.

Product Lifecycle: The MC33164P-3RAG holds active product status with established supply chain availability (2080 pcs in stock), providing long-term design continuity compared to the obsolete ZM331643C.

Thermal Performance: The extended operating temperature range of the MC33164P-3RAG (-40°C to 125°C) encompasses the original specification (-40°C to 85°C), supporting applications across broader environmental conditions.

Package Compatibility: Both devices utilize TO-92-3 / TO-226-3 through-hole packaging with compatible pinout and mechanical footprint, enabling direct board-level substitution.

Frequently Asked Questions (FAQ)

Q: Can MC33164P-3RAG directly replace ZM331643C in existing designs?

A: Yes. Both devices share identical functional architecture, output configuration, reset polarity, and through-hole package designation. The 0.03V threshold voltage difference (2.71V vs. 2.68V) is within normal supervisor tolerance bands for power management applications.

Q: What is the significance of the voltage threshold difference?

A: The ZM331643C monitors 2.68V while the MC33164P-3RAG monitors 2.71V. This 1.1% variance is typical within supervisor IC product families and does not affect functional compatibility for standard power supply monitoring applications.

Q: Are there package form factor differences between these devices?

A: Both use TO-92-3 / TO-226-3 through-hole packages. The MC33164P-3RAG specifies "Long Body (Formed Leads)" which maintains mechanical and electrical compatibility with standard TO-92 footprints.

Q: What is the advantage of selecting MC33164P-3RAG over ZM331643C?

A: The MC33164P-3RAG provides active product status with established supply availability, extended operating temperature range (-40°C to 125°C vs. -40°C to 85°C), and equivalent regulatory compliance. These factors ensure design continuity and long-term component availability.

Q: Are there any electrical parameter differences that affect circuit design?

A: The reset timeout specification differs: ZM331643C specifies 2.5µs typical propagation delay while MC33164P-3RAG does not provide this parameter in the available data. Both devices implement active-low reset output with open drain/open collector configuration, maintaining functional equivalence in standard supervisor applications.

Q: What certifications apply to both devices?

A: Both the ZM331643C and MC33164P-3RAG are ROHS3 compliant and classified as EAR99 for export control purposes. The MC33164P-3RAG is REACH Unaffected while the ZM331643C is REACH Affected, reflecting their respective manufacturing origins.