LM2931CD2TR4 Equivalent & Substitute Parts

Part Overview

The LM2931CD2TR4 is a linear voltage regulator IC from onsemi, designed for positive adjustable output applications with 100mA current capacity in a D2PAK-5 surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. The regulator features adjustable output voltage ranging from 2.7V to 29.5V with a maximum dropout voltage of 0.6V at 100mA, integrated over-current and over-temperature protection, and operation across -40°C to 125°C.

Substiute Parts

LM2931CD2TR4

onsemiIn Stock: 979LM2931CD2TR4 Datasheet

Current PartRFQ

LM2931ACD2TR4G

onsemiIn Stock: 1935LM2931ACD2TR4G Datasheet

Parametric EquivalentRFQ

LM2931CS/NOPB

National SemiconductorIn Stock: 1085LM2931CS/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2931CD2TR4 is determined by strict equivalence across the following critical parameters: output configuration (positive), output type (adjustable), number of regulators (1), maximum input voltage (26V), output voltage range (2.7V to 29.5V), output current (100mA), package type (D2PAK-5 / TO-263-6), and mounting type (surface mount).

The substitute parts identified maintain these core electrical and mechanical specifications, ensuring functional compatibility in existing circuit designs. Variations in secondary parameters such as quiescent current, supply current, dropout voltage, PSRR, and protection feature combinations do not preclude substitution when the primary parameters align.

Parameter Comparison

Engineering Selection Recommendations

The LM2931ACD2TR4G is the primary recommended substitute for the obsolete LM2931CD2TR4. Both parts are manufactured by onsemi and maintain identical electrical specifications across all critical parameters. The LM2931ACD2TR4G is currently in active production status with ROHS3 compliance, addressing regulatory requirements for new designs. Inventory availability is higher for the LM2931ACD2TR4G (1908 pcs vs. 927 pcs), supporting production continuity.

The LM2931CS/NOPB from National Semiconductor is a functional alternative that maintains compatibility with the core application requirements. However, this part exhibits differences in output voltage range (3V to 24V versus 2.7V to 29.5V), reduced maximum operating temperature (85°C versus 125°C), and enhanced protection features including reverse polarity and short circuit protection. These differences require circuit-level evaluation to confirm suitability for specific applications.

For new designs prioritizing regulatory compliance and long-term availability, the LM2931ACD2TR4G is the preferred selection. For applications with existing inventory constraints or specific performance requirements, the LM2931CS/NOPB may be evaluated based on output voltage and temperature range compatibility.

Frequently Asked Questions (FAQ)

Q: Can the LM2931ACD2TR4G directly replace the LM2931CD2TR4 in existing designs?

A: Yes. The LM2931ACD2TR4G maintains identical electrical specifications for output configuration, output type, voltage ranges, current capacity, dropout voltage, quiescent current, operating temperature range, and package type. Direct substitution is supported without circuit modification.

Q: What is the primary difference between LM2931CD2TR4 and LM2931ACD2TR4G?

A: The LM2931ACD2TR4G is the active production equivalent with ROHS3 compliance. The LM2931CD2TR4 is obsolete. Both parts are electrically identical.

Q: Can the LM2931CS/NOPB be used as a substitute?

A: The LM2931CS/NOPB is functionally compatible for applications where the output voltage range of 3V to 24V and maximum operating temperature of 85°C meet design requirements. Applications requiring the full 2.7V minimum output or operation above 85°C require the LM2931ACD2TR4G or LM2931CD2TR4.

Q: Are all substitute parts available in the same package?

A: Yes. All three parts use the TO-263-6 D2PAK (5 Leads + Tab) surface mount package, ensuring mechanical and thermal compatibility on existing PCB layouts.

Q: What compliance certifications differ between the substitutes?

A: The LM2931ACD2TR4G carries ROHS3 compliance. The LM2931CD2TR4 is RoHS non-compliant. The LM2931CS/NOPB compliance status is not specified in available documentation.