LM231AN Equivalent & Substitute Parts

Part Overview

The LM231AN is a Voltage to Frequency Converter IC operating at 100 kHz with ±0.01% linearity, housed in an 8-DIP through-hole package. This component is classified as obsolete by the manufacturer. Due to its obsolete status, identifying equivalent and substitute parts is essential for maintaining design continuity, ensuring supply chain reliability, and supporting legacy system repairs and production requirements.

Substiute Parts

LM231AN

Texas InstrumentsIn Stock: 8990LM231AN Datasheet

Current PartRFQ

LM231AN/NOPB

Texas InstrumentsIn Stock: 5968LM231AN/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM231AN is determined by strict equivalence across the following critical parameters:

• Functional Type: Voltage to Frequency Converter
• Maximum Frequency: 100 kHz
• Linearity Specification: ±0.01%
• Temperature Coefficient: ±50 ppm/°C
• Package Type: 8-DIP (0.300", 7.62mm)
• Mounting Configuration: Through Hole
• Pin Compatibility: 8-PDIP

The LM231AN/NOPB is identified as a direct substitute based on identical electrical specifications, package configuration, and pin assignment. The primary distinction is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The LM231AN/NOPB is the direct equivalent substitute for the LM231AN. Both parts maintain identical electrical performance specifications and physical package configuration. The LM231AN/NOPB offers the advantage of active product status, ensuring continued availability and supply chain support. Additionally, the LM231AN/NOPB carries ROHS3 compliance certification, providing regulatory alignment for applications subject to RoHS requirements. Selection between these parts should be based on compliance requirements and supply availability, as electrical performance and mechanical compatibility are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the LM231AN/NOPB be used as a direct replacement for the LM231AN?

A: Yes. Both parts are identical in electrical specifications, frequency response, linearity, temperature coefficient, and 8-DIP package configuration. Pin-for-pin compatibility is maintained.

Q: What is the significance of the "/NOPB" suffix in the LM231AN/NOPB part number?

A: The "/NOPB" designation indicates the part is supplied without lead (Pb), reflecting RoHS3 compliance. This is a manufacturer packaging and compliance designation, not a functional difference.

Q: Why is the LM231AN marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production and support. The LM231AN/NOPB remains in active production, making it the preferred selection for new designs and ongoing supply requirements.

Q: Are there any electrical performance differences between the LM231AN and LM231AN/NOPB?

A: No. Both parts deliver identical frequency conversion performance, linearity, and temperature stability specifications.

Q: What packaging options are available for this voltage to frequency converter?

A: Both the LM231AN and LM231AN/NOPB are supplied in 8-DIP through-hole packages with 0.300" (7.62mm) body width. The LM231AN/NOPB is supplied in tube packaging.

Q: Are there compliance considerations when selecting between these parts?

A: Yes. The LM231AN/NOPB is ROHS3 compliant, while the LM231AN is RoHS non-compliant. Applications subject to RoHS regulations should specify the LM231AN/NOPB.