LM2931CD2TG Equivalent & Substitute Parts

Part Overview

The LM2931CD2TG 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 device is classified as obsolete, making identification of active equivalent parts essential for ongoing production and design continuity. The LM2931 series provides low-dropout regulation suitable for applications requiring adjustable output voltage between 2.7V and 29.5V with integrated over-current and over-temperature protection.

Substiute Parts

LM2931CD2TG

onsemiIn Stock: 736LM2931CD2TG Datasheet

Current PartRFQ

LM2931ACD2TR4G

onsemiIn Stock: 1935LM2931ACD2TR4G Datasheet

DirectRFQ

LM2931CS/NOPB

National SemiconductorIn Stock: 1085LM2931CS/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM2931CD2TG is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid equivalency:

Primary Substitution Criteria:

• Output configuration: Positive adjustable
• Number of regulators: Single output
• Package type: D2PAK-5 (TO-263-6)
• Mounting type: Surface mount
• Current output rating: 100mA minimum
• Input voltage maximum: 26V or greater
• Output voltage range: Minimum 2.7V or lower, maximum 29.5V or higher
• Operating temperature range: -40°C to 125°C or wider
• Protection features: Over-current and over-temperature minimum

Substitute Parts Identified:

1. LM2931ACD2TR4G (onsemi) - Direct equivalent, active status
2. LM2931CS/NOPB (National Semiconductor) - Functional equivalent, active status

Parameter Comparison

Engineering Selection Recommendations

LM2931ACD2TR4G (Primary Substitute)

This part is the recommended direct replacement for the obsolete LM2931CD2TG. It maintains identical electrical specifications across all critical parameters: 26V maximum input, 2.7V to 29.5V adjustable output range, 100mA output current, and 0.6V maximum dropout voltage at 100mA. The device is manufactured by onsemi with active product status and ROHS3 compliance. Operating temperature range extends from -40°C to 125°C, matching the original specification. Packaging is D2PAK-5 surface mount, ensuring mechanical compatibility. The only difference is packaging format (Cut Tape vs. unspecified for original), which does not affect electrical or functional performance.

LM2931CS/NOPB (Secondary Substitute)

This part provides functional equivalency with notable parameter variations. Manufactured by National Semiconductor with active product status, it operates within the same D2PAK-5 package and surface mount configuration. Key differences include: minimum output voltage of 3V (versus 2.7V), maximum output voltage of 24V (versus 29.5V), and operating temperature range limited to -40°C to 85°C (versus 125°C maximum). The dropout voltage is superior at 0.3V versus 0.6V. Supply current is higher at 15mA maximum versus 6mA. Protection features are enhanced with reverse polarity and short circuit protection. Selection of this part requires confirmation that the application output voltage range does not exceed 24V and that the reduced upper operating temperature limit is acceptable.

Frequently Asked Questions (FAQ)

Q: Can LM2931ACD2TR4G directly replace LM2931CD2TG without circuit modification?

A: Yes. The LM2931ACD2TR4G is electrically and mechanically identical to the LM2931CD2TG across all specified parameters. No circuit modifications are required. Both devices share the same D2PAK-5 package pinout, input/output voltage specifications, current ratings, and protection features.

Q: What are the key differences between LM2931ACD2TR4G and LM2931CS/NOPB?

A: Both are functional equivalents but with parameter variations. The LM2931ACD2TR4G maintains the full 2.7V to 29.5V output range and 125°C maximum operating temperature. The LM2931CS/NOPB has a restricted output range (3V to 24V) and lower maximum operating temperature (85°C). The LM2931CS/NOPB offers superior dropout voltage (0.3V vs. 0.6V) and additional protection features (reverse polarity, short circuit).

Q: Are all three parts compatible with the same PCB layout?

A: Yes. All three devices use the D2PAK-5 (TO-263-6) surface mount package with identical pinout and mechanical dimensions. PCB layout and footprint remain unchanged across all substitutes.

Q: Which substitute should be selected for new designs?

A: LM2931ACD2TR4G is the preferred choice for new designs, as it maintains full parameter compatibility with the original specification and carries active product status from onsemi. LM2931CS/NOPB is suitable only when application requirements fall within its restricted output voltage range (3V to 24V) and reduced operating temperature limit (85°C maximum).

Q: What compliance certifications apply to each part?

A: LM2931CD2TG and LM2931ACD2TR4G are both ROHS3 compliant with MSL 1 (Unlimited). Both carry REACH Unaffected status and EAR99 ECCN classification. Compliance information for LM2931CS/NOPB is not specified in available data.

Q: Is the quiescent current specification identical across all parts?

A: Yes. All three devices specify 1mA quiescent current (Iq). However, maximum supply current differs: LM2931CD2TG and LM2931ACD2TR4G specify 6mA maximum, while LM2931CS/NOPB specifies 15mA maximum.