ASM809LEURF-T Equivalent & Substitute Parts

Part Overview

The ASM809LEURF-T is a single-channel supervisor IC manufactured by onsemi, designed for power management and reset control applications. This component monitors a single voltage threshold and provides active-low reset output with a 140ms minimum timeout. The ASM809LEURF-T is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. Substitute parts must maintain identical electrical characteristics and package compatibility to ensure direct replacement capability.

Substiute Parts

ASM809LEURF-T

onsemiIn Stock: 3141ASM809LEURF-T Datasheet

Current PartRFQ

MAX809LEUR+T

Analog Devices Inc./Maxim IntegratedIn Stock: 27043MAX809LEUR+T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ASM809LEURF-T are identified based on strict equivalence of the following critical parameters:

• Voltage Threshold: 4.63V (single-channel monitoring)
• Reset Logic: Active Low
• Reset Timeout: 140ms Minimum
• Operating Temperature Range: -40°C ~ 105°C (TA)
• Package Type: SOT-23-3 (TO-236-3, SC-59)
• Mounting Type: Surface Mount
• Functional Category: Simple Reset/Power-On Reset Supervisor

The MAX809LEUR+T qualifies as a direct substitute because it matches all critical electrical parameters and package specifications. The primary distinction is output configuration: the MAX809LEUR+T provides Push-Pull/Totem Pole output, whereas the ASM809LEURF-T output type is not specified. Both devices maintain identical voltage threshold, reset polarity, timeout duration, and thermal operating range.

Parameter Comparison

Engineering Selection Recommendations

The MAX809LEUR+T is the qualified substitute for the obsolete ASM809LEURF-T. Selection is based on the following engineering criteria:

Product Status: The ASM809LEURF-T is obsolete. The MAX809LEUR+T maintains active product status, ensuring long-term availability and manufacturing support.

Electrical Equivalence: Both devices share identical voltage threshold (4.63V), reset polarity (Active Low), reset timeout (140ms minimum), and operating temperature range (-40°C ~ 105°C). These parameters are the primary determinants of functional compatibility in supervisor IC applications.

Package Compatibility: Both parts use SOT-23-3 packaging (TO-236-3, SC-59), enabling direct PCB footprint compatibility without layout modifications.

Compliance & Certifications: Both parts maintain REACH Unaffected status, EAR99 ECCN classification, and identical HTSUS coding. The MAX809LEUR+T is RoHS3 Compliant, providing additional regulatory alignment for modern manufacturing environments.

Output Configuration: The MAX809LEUR+T specifies Push-Pull/Totem Pole output, which is a standard output stage for supervisor ICs and provides improved drive capability compared to open-drain configurations. This enhancement does not compromise compatibility with designs expecting active-low reset signals.

Frequently Asked Questions (FAQ)

Q: Can the MAX809LEUR+T directly replace the ASM809LEURF-T without circuit modifications?

A: Yes. Both devices share identical voltage threshold (4.63V), reset polarity (Active Low), reset timeout (140ms minimum), operating temperature range (-40°C ~ 105°C), and SOT-23-3 package. Direct PCB substitution is supported without schematic or layout changes.

Q: What is the significance of the Push-Pull/Totem Pole output on the MAX809LEUR+T?

A: Push-Pull output provides active drive capability in both high and low states, delivering improved noise immunity and faster signal transitions compared to open-drain configurations. This is a standard output stage for modern supervisor ICs and is fully compatible with reset input circuits designed for active-low logic.

Q: Are there any compliance or regulatory differences between these parts?

A: Both parts maintain REACH Unaffected status and EAR99 ECCN classification. The MAX809LEUR+T adds RoHS3 Compliance, which aligns with current environmental and manufacturing standards. No regulatory barriers exist to substitution.

Q: Why is the ASM809LEURF-T classified as obsolete?

A: Obsolescence reflects end-of-life status from the manufacturer. The MAX809LEUR+T, as an active product from Analog Devices Inc./Maxim Integrated, provides equivalent functionality with ongoing manufacturing and supply chain support.

Q: Are the moisture sensitivity levels identical?

A: Yes. Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage, handling, or assembly.

Q: What is the difference in packaging options between these parts?

A: The ASM809LEURF-T is listed with standard packaging. The MAX809LEUR+T is available in Cut Tape (CT) and Digi-Reel® formats, providing flexibility for both prototype and production volume requirements.