LM78M05CDT Linear Voltage Regulator 5V 500mA Equivalent & Substitute Parts

Part Overview

The LM78M05CDT is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed positive 5V output at 500mA in a TO-252-3 (DPAK) surface mount package. This device is classified as Last Time Buy, indicating end-of-life status. The part integrates over-current, over-temperature, and short-circuit protection, making it suitable for general-purpose power supply applications requiring regulated 5V output.

Due to Last Time Buy status, identifying functionally equivalent substitute parts is essential for design continuity and long-term supply chain planning. Substitute parts must maintain electrical compatibility across key parameters including output voltage, current rating, input voltage tolerance, and thermal protection features while accommodating the same or compatible package footprint.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	5V	V
Output Current	500mA	mA
Input Voltage (Maximum)	35V	V
Quiescent Current	3 mA	mA
PSRR @ 120Hz	78dB	dB
Protection Features	Over Current, Over Temperature, Short Circuit	—
Operating Temperature Range	-40°C to 125°C	°C
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the LM78M05CDT are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Fixed output voltage of 5V
Output current capability of 500mA or greater
Input voltage maximum rating of 25V or higher
TO-252-3 (DPAK) package compatibility
Surface mount mounting type
ROHS3 compliance

Substitutes are categorized into two groups:

Group 1: Direct Electrical Equivalents (500mA Output) Parts maintaining 500mA output current rating with identical or superior electrical specifications. These include LM78M05CDT/NOPB (Texas Instruments), L78M05ABDT-TR, L78M05ACDT-TR, and L78M05CDT-TR (STMicroelectronics).

Group 2: Higher Current Capability Substitutes (1A+ Output) Parts with 1A or higher output current rating, providing design margin and enhanced thermal performance. These include L7805CDT-TR (STMicroelectronics), MC7805BDTG, MC7805BDTRKG, and MC7805CDTG (onsemi). These parts are pin-compatible and can directly replace the LM78M05CDT in applications where higher current headroom is beneficial.

Group 3: Alternative Manufacturer Options (500mA Output) Parts from alternative manufacturers meeting 500mA specifications, including BA178M05FP-E2 (Rohm Semiconductor) and BD3571FP-E2 (Rohm Semiconductor). Note that BD3571FP-E2 carries Not For New Designs status and should be avoided for new applications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Quiescent Current	PSRR @ 120Hz	Operating Temp Range	Product Status	Package
LM78M05CDT	Texas Instruments	5V	500mA	35V	3 mA	78dB	-40°C to 125°C	Last Time Buy	TO-252-3
LM78M05CDT/NOPB	Texas Instruments	5V	500mA	35V	3 mA	78dB	-40°C to 125°C	Active	TO-252-3
L78M05ABDT-TR	STMicroelectronics	5V	500mA	35V	6 mA	62dB	-40°C to 125°C	Active	TO-252-3
L78M05ACDT-TR	STMicroelectronics	5V	500mA	35V	6 mA	62dB	0°C to 125°C	Active	TO-252-3
L78M05CDT-TR	STMicroelectronics	5V	500mA	35V	6 mA	62dB	0°C to 150°C	Active	TO-252-3
L7805CDT-TR	STMicroelectronics	5V	1.5A	35V	8 mA	62dB	0°C to 125°C	Active	TO-252-3
MC7805BDTG	onsemi	5V	1A	35V	8 mA	68dB	-40°C to 125°C	Active	TO-252-3
MC7805BDTRKG	onsemi	5V	1A	35V	8 mA	68dB	-40°C to 125°C	Active	TO-252-3
MC7805CDTG	onsemi	5V	1A	35V	6.5 mA	83dB	0°C to 125°C	Active	TO-252-3
BA178M05FP-E2	Rohm Semiconductor	5V	500mA	25V	4.5 mA	78dB	-40°C to 85°C	Active	TO-252-3
BD3571FP-E2	Rohm Semiconductor	5V	500mA	36V	30 µA	55dB	-40°C to 125°C	Not For New Designs	TO-252-3

Engineering Selection Recommendations

Primary Recommendation: LM78M05CDT/NOPB (Texas Instruments) This part is the direct active equivalent of the LM78M05CDT. It maintains identical electrical specifications and is currently in Active product status with substantial inventory availability (28,298 pcs). This is the preferred choice for direct replacement in existing designs.

Secondary Recommendation: L78M05CDT-TR (STMicroelectronics) This STMicroelectronics part offers extended operating temperature range to 150°C and maintains 500mA output current. It is in Active status with the highest inventory level (337,670 pcs) among all substitutes. Suitable for applications requiring enhanced thermal performance or extended temperature operation.

Higher Current Alternative: MC7805CDTG (onsemi) For applications where additional current headroom is beneficial, the MC7805CDTG provides 1A output current with superior PSRR (83dB) and is in Active status. This part is pin-compatible and can be used as a drop-in replacement with improved performance margin.

Alternative Manufacturer Option: BA178M05FP-E2 (Rohm Semiconductor) This part meets 500mA specifications and is in Active status. However, the maximum input voltage is limited to 25V compared to 35V for the primary options. Use only in applications where input voltage does not exceed 25V.

Parts to Avoid: BD3571FP-E2 (Rohm Semiconductor) This part carries Not For New Designs status and should not be selected for new applications despite its superior quiescent current specification.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A rated regulator (L7805CDT-TR, MC7805BDTRKG, MC7805CDTG) as a direct replacement for the LM78M05CDT?

A: Yes. All 1A rated parts listed are pin-compatible with the LM78M05CDT in the TO-252-3 package. They provide identical 5V output voltage and can supply the required 500mA. The higher current rating provides additional design margin and thermal performance. No circuit modifications are required.

Q: What is the difference between LM78M05CDT and LM78M05CDT/NOPB?

A: The /NOPB suffix indicates "No Plumbum" (lead-free) manufacturing. Both parts are electrically identical and meet ROHS3 compliance. The /NOPB variant is the current active production version.

Q: Why does BA178M05FP-E2 have a lower maximum input voltage (25V vs 35V)?

A: This is a design characteristic of the Rohm BA178M05 series. Applications requiring input voltages above 25V must use alternative parts such as LM78M05CDT/NOPB, L78M05CDT-TR, or onsemi MC7805 series.

Q: Can I use BD3571FP-E2 in a new design?

A: No. BD3571FP-E2 carries Not For New Designs status, indicating Rohm has discontinued active support for this part. Select from Active status alternatives instead.

Q: What is the significance of the operating temperature range differences?

A: The LM78M05CDT operates from -40°C to 125°C. Some substitutes (L78M05ACDT-TR, L7805CDT-TR, MC7805CDTG) have a 0°C minimum, which may not be suitable for applications requiring full -40°C operation. L78M05CDT-TR extends to 150°C maximum, beneficial for high-temperature environments. Verify application requirements before selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed in this reference are ROHS3 compliant and suitable for applications with RoHS requirements.

Q: What packaging options are available?

A: All parts listed use TO-252-3 (DPAK) surface mount package. Packaging variants (Tube, Cut Tape & Digi-Reel, Tape & Reel) differ only in quantity and delivery format, not in electrical or mechanical specifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message