SP809NEK-L-2-9/TR Equivalent & Substitute Parts

Part Overview

The SP809NEK-L-2-9/TR is a single-channel power supply supervisor IC manufactured by MaxLinear, Inc., designed for power-on reset and simple reset applications. This component operates as an open drain or open collector output device with a 2.9V threshold voltage and 140ms minimum reset timeout. The part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

SP809NEK-L-2-9/TR

MaxLinear, Inc.In Stock: 21585SP809NEK-L-2-9/TR Datasheet

Current PartRFQ

SP809EK-L-2-9/TR

MaxLinear, Inc.In Stock: 35503SP809EK-L-2-9/TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SP809NEK-L-2-9/TR is determined by the following critical parameters:

• Voltage Threshold: 2.9V (single-channel monitoring)
• Reset Type: Active Low
• Reset Timeout: 140ms Minimum
• Operating Temperature Range: -40°C ~ 85°C
• Package: SOT-23-3 (surface mount)
• Base Product Series: SP809

The SP809EK-L-2-9/TR qualifies as a direct substitute based on matching all core electrical specifications. The primary difference lies in the output configuration: the substitute employs a push-pull (totem pole) output topology, whereas the original uses open drain or open collector output. Both output types are functionally compatible in reset circuit applications where the output drives a logic input or gate, provided the pull-up resistor network is appropriately configured for the push-pull output.

Parameter Comparison

Engineering Selection Recommendations

The SP809EK-L-2-9/TR is the recommended substitute for the obsolete SP809NEK-L-2-9/TR. Selection is justified on the following basis:

• Product Status: The substitute is active and currently in production, ensuring long-term availability and supply chain continuity.
• Electrical Equivalence: All critical electrical parameters—voltage threshold, reset timeout, operating temperature range, and reset polarity—are identical.
• Compliance: The substitute carries ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements.
• Package Compatibility: Both parts use the SOT-23-3 package, enabling direct PCB footprint compatibility.
• Output Configuration: The push-pull output of the substitute provides improved drive capability compared to open drain, offering enhanced noise immunity and faster edge transitions in reset circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the SP809EK-L-2-9/TR directly replace the SP809NEK-L-2-9/TR without circuit modifications?

A: Direct replacement is possible in most applications. The primary difference is the output type: push-pull versus open drain. If the original design includes external pull-up resistors on the reset output, these should be removed or the circuit should be re-evaluated for the push-pull output. If the original design relies on the open-drain characteristic (e.g., for wired-OR logic), circuit modification is required.

Q: What is the significance of the output type difference?

A: Open drain outputs require external pull-up resistors and are suitable for wired-OR configurations. Push-pull outputs provide both high and low drive capability without external resistors, resulting in faster switching and improved signal integrity. For standard reset applications driving a logic input, push-pull output is functionally superior.

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

A: The substitute (SP809EK-L-2-9/TR) is explicitly ROHS3 compliant and REACH unaffected. The original part's compliance status is not specified. For applications requiring regulatory compliance documentation, the substitute is the appropriate choice.

Q: Is the SOT-23-3 package identical for both parts?

A: Yes. Both parts use the TO-236-3 / SC-59 / SOT-23-3 package designation, ensuring identical PCB footprint and land pattern compatibility.

Q: What is the inventory status of the substitute?

A: The SP809EK-L-2-9/TR has 35,400 pieces in stock as new original inventory, providing immediate availability for procurement.