LM2931CT Equivalent & Substitute Parts

Part Overview

The LM2931CT is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 100mA output current in a TO-220-5 package configuration. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The LM2931CT provides adjustable output voltage regulation with integrated protection features including over-temperature, reverse polarity, and short-circuit protection.

Substiute Parts

LM2931CT

Texas InstrumentsIn Stock: 985111LM2931CT Datasheet

Current PartRFQ

LM2931CT/NOPB

Texas InstrumentsIn Stock: 2192LM2931CT/NOPB Datasheet

DirectRFQ

LM2931ACTVG

onsemiIn Stock: 1234LM2931ACTVG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2931CT are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Output configuration (Positive)
• Output type (Adjustable)
• Number of regulators (1)
• Package type (TO-220-5)
• Output current rating (100mA)
• Input voltage maximum (26V)
• Mounting type (Through Hole)

Secondary Compatibility Parameters:

• Output voltage range overlap
• Dropout voltage performance
• Protection features
• Operating temperature range
• RoHS and REACH compliance status

The LM2931CT/NOPB represents a direct equivalent from the same manufacturer with identical electrical specifications but improved product status and compliance. The LM2931ACTVG from onsemi provides an alternative from a different manufacturer with comparable core functionality but with variations in output voltage range, dropout voltage, and operating temperature limits.

Parameter Comparison

Engineering Selection Recommendations

LM2931CT/NOPB is the primary substitute for the LM2931CT. Both parts share identical electrical specifications and thermal operating range. The LM2931CT/NOPB carries Active product status and ROHS3 compliance, providing superior long-term availability and regulatory alignment compared to the obsolete LM2931CT.

LM2931ACTVG from onsemi serves as an alternative substitute when LM2931CT/NOPB is unavailable. This part maintains the same output current, input voltage maximum, and quiescent current specifications. The LM2931ACTVG offers an extended operating temperature range (-40°C to 125°C) and wider output voltage range (2.7V to 29.5V), which may accommodate broader application requirements. However, the increased dropout voltage (0.6V versus 0.3V) and different protection feature set require circuit-level evaluation for specific applications.

Selection between these substitutes depends on application requirements for output voltage range, thermal operating conditions, and dropout voltage performance. Both alternatives are ROHS3 compliant and REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can LM2931CT/NOPB be used as a direct replacement for LM2931CT?

A: Yes. The LM2931CT/NOPB is a direct equivalent with identical electrical and thermal specifications. The primary difference is product status (Active versus Obsolete) and packaging designation (Bulk versus standard). Both parts are pin-compatible in TO-220-5 configuration.

Q: What are the key differences between LM2931CT and LM2931ACTVG?

A: The LM2931ACTVG differs in three areas: output voltage range (2.7V to 29.5V versus 3V to 24V), dropout voltage (0.6V versus 0.3V at 100mA), and operating temperature range (-40°C to 125°C versus -40°C to 85°C). The protection feature set also differs, with LM2931ACTVG providing over-current protection instead of reverse polarity protection.

Q: Are all substitute parts available in the same TO-220-5 package?

A: Yes. All listed substitutes use TO-220-5 package configuration. The LM2931ACTVG specifies TO-220-5 Formed Leads, which maintains mechanical and electrical compatibility with standard TO-220-5 through-hole mounting.

Q: Which substitute should be selected for new designs?

A: LM2931CT/NOPB is recommended for new designs due to Active product status, ensuring long-term availability and supply chain stability. This part maintains identical specifications to the original LM2931CT while providing improved compliance and procurement continuity.

Q: Does the increased dropout voltage of LM2931ACTVG affect circuit performance?

A: The LM2931ACTVG dropout voltage of 0.6V at 100mA is double that of the LM2931CT (0.3V). This affects minimum input-to-output voltage differential required for regulation. Circuit designs must account for this difference when selecting between substitutes, particularly in applications with limited input voltage headroom.