LM2931T-5.0 Equivalent & Substitute Parts

Part Overview

The LM2931T-5.0 is a linear voltage regulator IC from Texas Instruments, delivering a fixed positive 5V output at 100mA in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The LM2931T-5.0 provides thermal protection, reverse polarity protection, and short-circuit protection across an operating temperature range of -40°C to 85°C with a maximum input voltage of 26V and dropout voltage of 0.3V at 100mA.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	26V
Dropout Voltage @ 100mA	0.3V
Quiescent Current	1 mA
Package	TO-220-3
Operating Temperature	-40°C to 85°C
Protection Features	Over Temperature, Reverse Polarity, Short Circuit

Substitute Part Grouping Explanation

Substitute parts are categorized based on electrical and mechanical compatibility with the LM2931T-5.0. The primary substitution criteria are:

Direct Equivalents maintain identical electrical specifications: 5V fixed output, 100mA output current, 26V maximum input voltage, 0.3V dropout voltage at 100mA, TO-220-3 package, and -40°C to 85°C operating temperature range.

Parametric Equivalents provide the same 5V output and 100mA current capability in TO-220-3 packaging but may vary in dropout voltage, quiescent current, supply current, PSRR, or operating temperature range. These parts are functionally compatible for most applications but require verification of specific performance requirements.

Manufacturer Recommended Alternatives offer higher output current capability (500mA to 1A) or extended temperature ranges, suitable for applications requiring greater current headroom or wider operating conditions. These parts maintain the 5V output and TO-220-3 package form factor.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout @ Rated Current	Quiescent Current	Operating Temp	Product Status	RoHS Status
LM2931T-5.0	Texas Instruments	100mA	26V	0.3V @ 100mA	1 mA	-40°C to 85°C	Obsolete	Non-compliant
LM2931T-5.0/NOPB	Texas Instruments	100mA	26V	0.3V @ 100mA	1 mA	-40°C to 85°C	Active	ROHS3 Compliant
LM2931AT-5.0	National Semiconductor	100mA	26V	0.6V @ 100mA	1 mA	-40°C to 125°C	Active	Not specified
LM2931AT-5.0/NOPB	National Semiconductor	100mA	26V	0.3V @ 100mA	15 mA	-40°C to 85°C	Active	Not specified
LM2931AT-5.0G	onsemi	100mA	26V	0.6V @ 100mA	1 mA	-40°C to 125°C	Active	ROHS3 Compliant
LM2931T-5.0G	onsemi	100mA	26V	0.6V @ 100mA	1 mA	-40°C to 125°C	Active	ROHS3 Compliant
L4941BV	STMicroelectronics	1A	16V	0.7V @ 1A	8 mA	-40°C to 150°C	Active	ROHS3 Compliant
LF50ABV	STMicroelectronics	500mA	16V	0.7V @ 500mA	1 mA	-40°C to 125°C	Active	ROHS3 Compliant
LF50CV	STMicroelectronics	500mA	16V	0.7V @ 500mA	1 mA	-40°C to 125°C	Active	ROHS3 Compliant
MC7805ABTG	onsemi	1A	35V	2V @ 1A (Typ)	6 mA	-40°C to 125°C	Active	ROHS3 Compliant
MC7805ACTG	onsemi	1A	35V	2V @ 1A (Typ)	6 mA	0°C to 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Preferred for Obsolete Part Substitution): LM2931T-5.0/NOPB from Texas Instruments is the direct equivalent with identical electrical specifications and active product status. This part is ROHS3 compliant and maintains the same 100mA output current, 0.3V dropout voltage, and -40°C to 85°C operating range as the original LM2931T-5.0.

Active Alternatives with Extended Temperature Range: LM2931AT-5.0G and LM2931T-5.0G from onsemi provide the same 100mA output current and 26V input voltage rating with extended operating temperature to 125°C. Both are ROHS3 compliant and active products. The LM2931AT-5.0G exhibits 0.6V dropout voltage, while LM2931T-5.0G also specifies 0.6V dropout. These are suitable for applications requiring wider temperature operation.

Higher Current Alternatives: For applications requiring greater output current capacity, LF50ABV and LF50CV from STMicroelectronics deliver 500mA at 5V output in TO-220-3 packaging. L4941BV from STMicroelectronics provides 1A output current. All three are ROHS3 compliant and active. These alternatives are appropriate when the original 100mA specification is insufficient.

Legacy High-Current Option: MC7805ABTG and MC7805ACTG from onsemi deliver 1A output current with 35V maximum input voltage. MC7805ABTG operates from -40°C to 125°C, while MC7805ACTG operates from 0°C to 125°C. Both are ROHS3 compliant and suitable for applications requiring higher current and wider input voltage tolerance.

Frequently Asked Questions (FAQ)

Q: Can LM2931T-5.0/NOPB directly replace the obsolete LM2931T-5.0? A: Yes. LM2931T-5.0/NOPB is the direct equivalent with identical electrical specifications: 5V output, 100mA current, 0.3V dropout voltage at 100mA, 26V maximum input voltage, and -40°C to 85°C operating temperature. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between LM2931AT-5.0 and LM2931AT-5.0/NOPB? A: Both are from National Semiconductor with 100mA output and 26V input rating. LM2931AT-5.0 specifies 0.6V dropout voltage and 30mA supply current. LM2931AT-5.0/NOPB specifies 0.3V dropout voltage but 15mA quiescent current. The /NOPB variant indicates lead-free packaging.

Q: Can I use LF50ABV or LF50CV as a drop-in replacement? A: These parts maintain the TO-220-3 package and 5V output but deliver 500mA instead of 100mA. They are suitable if your application can tolerate the higher current capability. Note the reduced maximum input voltage of 16V compared to the original 26V specification.

Q: What are the key differences between onsemi LM2931 variants and the original Texas Instruments part? A: onsemi LM2931AT-5.0G and LM2931T-5.0G maintain 100mA output and 26V input rating but extend operating temperature to 125°C and specify 0.6V dropout voltage. Both are ROHS3 compliant and active products, making them suitable long-term alternatives.

Q: Is MC7805ABTG compatible with the LM2931T-5.0 in all applications? A: MC7805ABTG delivers 1A output current and accepts up to 35V input, but exhibits 2V typical dropout voltage compared to 0.3V for the original part. This higher dropout may affect performance in low-input-voltage applications. Verify dropout voltage requirements before substitution.

Q: What packaging considerations apply to these substitutes? A: All listed substitutes use TO-220-3 through-hole packaging, maintaining mechanical compatibility with the original LM2931T-5.0. Verify PCB layout and thermal management requirements, as higher-current alternatives (500mA to 1A) may require different heatsinking.

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