LM2931CT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM2931CT is a linear voltage regulator IC designed for positive adjustable output applications with a maximum output current of 100mA in a TO-220-5 package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The LM2931CT provides adjustable output voltage regulation with integrated over-current and over-temperature protection features suitable for low-current power management applications.

Substiute Parts

LM2931CT

onsemiIn Stock: 985175LM2931CT Datasheet

Current PartRFQ

LM2931CT/NOPB

Texas InstrumentsIn Stock: 2192LM2931CT/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2931CT is determined by the following critical parameters:

• Package Compatibility: TO-220-5 form factor for direct mechanical and thermal interface compatibility
• Output Configuration: Positive adjustable output topology
• Current Rating: 100mA maximum output current capability
• Voltage Range: Input maximum of 26V and adjustable output voltage capability
• Mounting Type: Through-hole technology for PCB integration
• Number of Regulators: Single regulator per package

The substitute part LM2931CT/NOPB from Texas Instruments meets all primary substitution criteria. This part maintains identical package, output configuration, current rating, and mounting specifications while offering enhanced electrical performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The LM2931CT/NOPB from Texas Instruments is the direct substitute for the obsolete LM2931CT from onsemi. Both devices share identical base product number designation and maintain functional equivalence across core electrical specifications.

The Texas Instruments variant offers the following advantages:

• Active Product Status: Ensures long-term availability and manufacturing support
• Enhanced Compliance: ROHS3 compliant versus non-compliant status of the original part
• Improved Dropout Performance: 0.3V dropout at 100mA versus 0.6V, reducing thermal dissipation requirements
• Extended Protection: Includes reverse polarity and short circuit protection in addition to over-temperature protection

Design considerations for substitution include the reduced maximum output voltage (24V versus 29.5V) and narrower operating temperature range (-40°C to 85°C versus -40°C to 125°C). Applications requiring output voltages above 24V or operating temperatures above 85°C require design review prior to substitution.

Frequently Asked Questions (FAQ)

Q: Can the LM2931CT/NOPB directly replace the LM2931CT in existing designs?

A: Direct mechanical and electrical substitution is supported for applications within the overlapping electrical specifications. The LM2931CT/NOPB maintains identical TO-220-5 package pinout, 100mA output current capability, and adjustable output configuration. Design verification is required for applications utilizing output voltages above 24V or operating temperatures above 85°C.

Q: What are the key differences between these two parts?

A: The primary differences are product status (active versus obsolete), RoHS compliance (ROHS3 compliant versus non-compliant), dropout voltage performance (0.3V versus 0.6V at 100mA), and operating temperature range (-40°C to 85°C versus -40°C to 125°C). The Texas Instruments part includes additional protection features for reverse polarity and short circuit conditions.

Q: Are there any package or pinout differences?

A: Both devices utilize the TO-220-5 package with identical pinout configuration. No PCB layout modifications are required for substitution.

Q: What compliance certifications apply to the substitute part?

A: The LM2931CT/NOPB is ROHS3 compliant and REACH unaffected. The original LM2931CT is RoHS non-compliant. Applications subject to RoHS requirements must use the Texas Instruments variant.

Q: How does the reduced maximum output voltage affect substitution?

A: The LM2931CT/NOPB supports adjustable output up to 24V, compared to 29.5V for the original part. Applications requiring output voltages between 24V and 29.5V cannot use the substitute without design modification.