LM321MFX Equivalent & Substitute Parts

Part Overview

The LM321MFX is a general-purpose operational amplifier manufactured by Texas Instruments, housed in a SOT-23-5 surface mount package. This device functions as a single-channel amplifier circuit suitable for general-purpose analog signal processing applications. The LM321MFX is classified as Last Time Buy, indicating discontinued production status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Substiute Parts

LM321MFX

Texas InstrumentsIn Stock: 132442LM321MFX Datasheet

Current PartRFQ

LM321MFX/NOPB

Texas InstrumentsIn Stock: 65392LM321MFX/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM321MFX is determined by electrical and mechanical parameter equivalence within the general-purpose operational amplifier category. The critical parameters governing substitution are:

Electrical Parameters:

• Slew Rate: 0.4 V/µs
• Gain Bandwidth Product: 1 MHz
• Current - Input Bias: 45 nA
• Voltage - Input Offset: 2 mV
• Current - Supply: 660 µA
• Current - Output / Channel: 40 mA
• Voltage - Supply Span: 3 V to 30 V minimum, 32 V maximum acceptable
• Operating Temperature Range: -40°C to 85°C

Mechanical Parameters:

• Package / Case: SC-74A, SOT-753 (SOT-23-5)
• Mounting Type: Surface Mount
• Number of Circuits: 1

Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

The LM321MFX/NOPB qualifies as a direct substitute based on identical electrical performance specifications and mechanical compatibility. The maximum supply voltage specification of 32 V for the substitute part exceeds the 30 V minimum requirement, maintaining full operational compatibility.

Parameter Comparison

Engineering Selection Recommendations

The LM321MFX/NOPB is the direct substitute for the LM321MFX. Both parts are manufactured by Texas Instruments and share identical electrical specifications and mechanical packaging. The primary distinction is product status: the LM321MFX is Last Time Buy, while the LM321MFX/NOPB maintains Active status with ongoing production and availability.

Selection of the LM321MFX/NOPB is supported by:

• Identical electrical performance across all specified parameters
• Mechanical compatibility with existing PCB designs and assembly processes
• Equivalent RoHS3 compliance and MSL rating
• Active production status ensuring long-term supply chain continuity
• Identical base product number (LM321) confirming functional equivalence

The "/NOPB" suffix indicates lead-free plating, consistent with modern manufacturing standards and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the LM321MFX/NOPB be used as a direct replacement for the LM321MFX?

A: Yes. The LM321MFX/NOPB is a direct substitute. All electrical parameters, package specifications, and compliance certifications are identical. The parts are pin-compatible and functionally equivalent.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" designation indicates "No Plumbum" (lead-free). This refers to the lead-free plating used in the component's manufacturing process, compliant with RoHS regulations.

Q: Are there any supply voltage differences between these parts?

A: The LM321MFX/NOPB supports a maximum supply voltage of 32 V, compared to 30 V for the LM321MFX. This represents an expanded operating range and does not restrict compatibility. Both parts operate within the 3 V minimum specification.

Q: Is the SOT-23-5 package identical for both parts?

A: Yes. Both the LM321MFX and LM321MFX/NOPB use the SC-74A, SOT-753 package designation, which is the SOT-23-5 surface mount package. Pin configuration and footprint are identical.

Q: Why is the LM321MFX marked as Last Time Buy?

A: Last Time Buy status indicates that the LM321MFX has been discontinued by Texas Instruments. The LM321MFX/NOPB remains in active production and is the recommended part for new designs and ongoing supply requirements.

Q: Are moisture sensitivity and RoHS compliance identical?

A: Yes. Both parts carry MSL rating 1 (Unlimited) and ROHS3 compliance, indicating equivalent handling requirements and regulatory conformance.