LM809M3X-4.00 Equivalent & Substitute Parts

Part Overview

The LM809M3X-4.00 is a single-channel power management supervisor IC manufactured by Texas Instruments, designed for reset and power-on reset applications. This device features push-pull totem pole output configuration with a 4V voltage threshold and 140ms minimum reset timeout. The part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production support.

Substiute Parts

LM809M3X-4.00

Texas InstrumentsIn Stock: 3474LM809M3X-4.00 Datasheet

Current PartRFQ

LP3470M5-4.00/NOPB

Texas InstrumentsIn Stock: 2298LP3470M5-4.00/NOPB Datasheet

MFR RecommendedRFQ

ADM809JARTZ-REEL7

Analog Devices Inc.In Stock: 9364ADM809JARTZ-REEL7 Datasheet

MFR RecommendedRFQ

APX809-40SAG-7

Diodes IncorporatedIn Stock: 8193APX809-40SAG-7 Datasheet

MFR RecommendedRFQ

TCM809JVLB713

Microchip TechnologyIn Stock: 15205TCM809JVLB713 Datasheet

MFR RecommendedRFQ

TCM809JVNB713

Microchip TechnologyIn Stock: 5179TCM809JVNB713 Datasheet

MFR RecommendedRFQ

MAX809JEUR+T

Analog Devices Inc./Maxim IntegratedIn Stock: 7626MAX809JEUR+T Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM809M3X-4.00 are identified based on the following critical parameters that must align for functional equivalence:

• Voltage Threshold: 4V (all substitutes match this specification)
• Output Configuration: Push-Pull, Totem Pole (primary substitutes maintain this output type)
• Reset Logic: Active Low (consistent across all alternatives)
• Reset Timeout: 140ms Minimum (maintained in primary substitutes)
• Package Compatibility: SOT-23-3 or SC-70-3 (pin-compatible or functionally equivalent packages)
• Mounting Type: Surface Mount (all substitutes are surface mount)
• Single Channel: All substitutes monitor one voltage channel

Substitutes are categorized as follows:

Direct Package Equivalents (SOT-23-3): ADM809JARTZ-REEL7, APX809-40SAG-7, TCM809JVNB713, and MAX809JEUR+T maintain identical package footprints and output configurations, enabling direct board-level replacement.

Alternative Package Equivalent (SC-70-3): TCM809JVLB713 provides functional equivalence with a different surface mount package (SC-70-3 vs. SOT-23-3), requiring PCB layout modification.

Output Configuration Variant: LP3470M5-4.00/NOPB differs in output configuration (Open Drain vs. Push-Pull), limiting substitution to applications where output type flexibility exists.

Parameter Comparison

Engineering Selection Recommendations

Recommended Primary Substitutes for New Designs:

ADM809JARTZ-REEL7 and TCM809JVNB713 are the preferred alternatives. Both maintain active product status, support extended operating temperature ranges (-40°C ~ 125°C), and provide identical electrical and package specifications to the LM809M3X-4.00. These parts ensure long-term supply chain stability and design continuity.

Secondary Substitutes for Existing Production:

MAX809JEUR+T offers active product status with matching electrical parameters and SOT-23-3 package compatibility. Operating temperature range (-40°C ~ 105°C) aligns with the original part specification.

TCM809JVLB713 provides functional equivalence with active product status and extended temperature range but requires PCB layout modification due to SC-70-3 package substitution for SOT-23-3.

Limited Substitution Options:

APX809-40SAG-7 maintains electrical equivalence but carries "Not For New Designs" status, limiting applicability to legacy production support only.

LP3470M5-4.00/NOPB differs in output configuration (Open Drain vs. Push-Pull) and reset timeout specification (1ms vs. 140ms), restricting substitution to applications where these parameter variations are acceptable. This part also carries "Not For New Designs" status.

Frequently Asked Questions (FAQ)

Q: Can ADM809JARTZ-REEL7 replace LM809M3X-4.00 directly on the PCB?

A: Yes. ADM809JARTZ-REEL7 maintains identical SOT-23-3 package footprint, voltage threshold (4V), output configuration (Push-Pull, Totem Pole), reset logic (Active Low), and reset timeout (140ms Minimum). No PCB modifications are required.

Q: What is the difference between TCM809JVNB713 and TCM809JVLB713?

A: Both are manufactured by Microchip Technology with identical electrical specifications. TCM809JVNB713 uses SOT-23-3 package (direct replacement for LM809M3X-4.00), while TCM809JVLB713 uses SC-70-3 package. Package selection depends on PCB layout constraints and available footprint space.

Q: Why is LP3470M5-4.00/NOPB listed as a substitute if the output configuration differs?

A: LP3470M5-4.00/NOPB is included as a parametric equivalent due to matching voltage threshold (4V) and reset logic (Active Low). However, the Open Drain output configuration differs from the original Push-Pull specification. Substitution is only valid for applications where output type flexibility exists or where external pull-up resistors can accommodate the different output stage.

Q: Can I use APX809-40SAG-7 for new product designs?

A: APX809-40SAG-7 carries "Not For New Designs" product status. While electrical parameters match the LM809M3X-4.00, this designation indicates limited long-term availability. Use ADM809JARTZ-REEL7 or TCM809JVNB713 for new designs to ensure supply chain continuity.

Q: What operating temperature range should I consider for thermal design?

A: The LM809M3X-4.00 operates from -40°C to 105°C. Recommended substitutes ADM809JARTZ-REEL7 and TCM809JVNB713 support extended ranges (-40°C to 125°C), providing additional thermal margin. APX809-40SAG-7 operates to 85°C, which may be limiting in high-temperature applications.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitutes maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental certifications.