LM2931ADT-5.0 Equivalent & Substitute Parts

Part Overview

The LM2931ADT-5.0 is a linear voltage regulator IC from onsemi designed to deliver a fixed 5V output at 100mA in a surface-mount DPAK package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs or production continuity. The regulator features integrated over-current and over-temperature protection, making it suitable for general-purpose power management applications requiring low-current 5V regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	26V
Dropout Voltage	0.6V @ 100mA
Quiescent Current	1 mA
Package	TO-252-3 (DPAK)
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitution for the LM2931ADT-5.0 is determined by the following critical parameters:

Output voltage and configuration: Fixed 5V positive output
Package compatibility: TO-252-3 (DPAK) surface-mount form factor
Output current capability: Minimum 100mA required for direct replacement
Input voltage rating: Maximum 26V or higher
Dropout voltage: Performance at specified current levels
Operating temperature range: -40°C to 125°C minimum
Protection features: Over-current and over-temperature protection

Substitute parts are grouped into two categories:

Parametric Equivalents maintain identical electrical specifications and are direct replacements with no design modifications required.

Similar Parts offer higher current capability, improved performance characteristics, or enhanced protection features while maintaining the same output voltage, package, and operating temperature range. These parts are suitable for designs where the LM2931ADT-5.0 specifications are met or exceeded.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Product Status	RoHS Status	Inventory
LM2931ADT-5.0	onsemi	100mA	26V	0.6V @ 100mA	1 mA	Obsolete	Non-compliant	1023 Pcs
LM2931DT-5.0G	onsemi	100mA	26V	0.6V @ 100mA	1 mA	Active	ROHS3 Compliant	2400 Pcs
LM2931ADT50R	STMicroelectronics	100mA	26V	0.6V @ 100mA	1 mA	Active	ROHS3 Compliant	60533 Pcs
BD3571YFP-ME2	Rohm Semiconductor	500mA	36V	0.48V @ 200mA	50 µA	Active	ROHS3 Compliant	1315 Pcs
IFX25001TFV50ATMA1	Infineon Technologies	400mA	40V	0.5V @ 250mA	220 µA	Obsolete	ROHS3 Compliant	3729 Pcs
TL750L05CKVURG3	Texas Instruments	150mA	26V	0.6V @ 150mA	2 mA	Active	ROHS3 Compliant	3528 Pcs
TLE42744DV50ATMA1	Infineon Technologies	400mA	40V	0.5V @ 250mA	220 µA	Active	ROHS3 Compliant	1908 Pcs
LM2936QDT-5.0/NOPB	Texas Instruments	50mA	40V	0.4V @ 50mA	9 µA	Active	ROHS3 Compliant	989 Pcs
LM2936QDTX-5.0/NOPB	Texas Instruments	50mA	40V	0.4V @ 50mA	9 µA	Active	ROHS3 Compliant	1041 Pcs
LM9036DT-5.0/NOPB	Texas Instruments	50mA	40V	0.40V @ 50mA	20 µA	Active	ROHS3 Compliant	5900 Pcs
LM9036DTX-5.0/NOPB	Texas Instruments	50mA	40V	0.40V @ 50mA	20 µA	Active	ROHS3 Compliant	10200 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

LM2931DT-5.0G from onsemi is the primary parametric equivalent. It maintains 100% electrical compatibility with the LM2931ADT-5.0 while offering active product status and ROHS3 compliance. This part requires no design modifications and provides the highest confidence for direct substitution.

LM2931ADT50R from STMicroelectronics is an alternative parametric equivalent with identical electrical specifications. It offers significantly higher inventory availability (60533 Pcs) and active product status with ROHS3 compliance.

For Applications Requiring Higher Current Capability:

BD3571YFP-ME2 from Rohm Semiconductor provides 500mA output current with improved dropout voltage (0.48V @ 200mA) and higher input voltage rating (36V). This part is suitable for designs where current demand exceeds 100mA while maintaining the same package and output voltage.

TLE42744DV50ATMA1 from Infineon Technologies delivers 400mA output current with automotive-grade qualification (AEC-Q100) and extended operating temperature range (-40°C to 150°C). This part is appropriate for automotive applications or designs requiring higher current margins.

TL750L05CKVURG3 from Texas Instruments offers 150mA output current, matching the input voltage rating of the original part (26V). This part bridges the gap between the 100mA original specification and higher-current alternatives.

For Low-Current Applications:

LM2936QDT-5.0/NOPB, LM2936QDTX-5.0/NOPB, LM9036DT-5.0/NOPB, and LM9036DTX-5.0/NOPB from Texas Instruments are suitable only if application current requirements do not exceed 50mA. These parts offer superior quiescent current performance and higher input voltage ratings (40V) but are undersized for the original 100mA specification.

Compliance Considerations:

All recommended active substitutes are ROHS3 compliant. The original LM2931ADT-5.0 is RoHS non-compliant; migration to compliant alternatives is necessary for new designs subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q: Can LM2931DT-5.0G be used as a direct replacement for LM2931ADT-5.0?

A: Yes. LM2931DT-5.0G is a parametric equivalent with identical output voltage (5V), output current (100mA), input voltage rating (26V), dropout voltage (0.6V @ 100mA), and operating temperature range (-40°C to 125°C). The primary difference is product status (active vs. obsolete) and packaging format (tube vs. unspecified). No circuit modifications are required.

Q: What is the difference between LM2931ADT50R and LM2931DT-5.0G?

A: Both parts are parametric equivalents with identical electrical specifications. LM2931ADT50R is manufactured by STMicroelectronics with significantly higher inventory availability (60533 Pcs). LM2931DT-5.0G is from onsemi. Selection between these parts should be based on supply chain availability and preferred supplier qualification.

Q: Can I use BD3571YFP-ME2 if my circuit only requires 100mA?

A: Yes. BD3571YFP-ME2 provides 500mA output current, which exceeds the 100mA requirement. The part maintains the same 5V output voltage, TO-252-3 package, and operating temperature range. Higher current capability does not degrade performance in lower-current applications. The improved dropout voltage (0.48V @ 200mA) and higher input voltage rating (36V) provide additional design margins.

Q: Why are LM2936 and LM9036 series parts listed as substitutes if they only provide 50mA?

A: These parts are listed because they share the same output voltage (5V), package (TO-252-3), and operating temperature range. However, they are undersized for the original 100mA specification and are suitable only for applications where current demand does not exceed 50mA. They should not be selected for direct replacement of the LM2931ADT-5.0 in 100mA applications.

Q: What is the significance of the DPAK package designation?

A: DPAK (also designated TO-252-3) is a three-lead surface-mount package with a thermal tab. All substitute parts listed maintain this package format, ensuring mechanical and thermal compatibility with existing PCB layouts. No footprint modifications are required when substituting between parts with identical package designations.

Q: Are there any temperature range differences I should consider?

A: The original LM2931ADT-5.0 operates from -40°C to 125°C. Most active substitutes maintain this range. TLE42744DV50ATMA1 extends the upper limit to 150°C, providing additional thermal margin for high-temperature environments. LM2936 and LM9036 series parts specify -40°C to 125°C (TJ), which is equivalent to the original specification.

Q: What does RoHS compliance mean for my design?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead, cadmium, mercury, and other hazardous materials. The original LM2931ADT-5.0 is RoHS non-compliant. If your design is subject to RoHS requirements (EU markets, automotive, consumer electronics), select only ROHS3-compliant alternatives such as LM2931DT-5.0G or LM2931ADT50R.

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