L78LR05E-MA-E Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The L78LR05E-MA-E is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 150mA. This Surface Mount device operates across an input voltage range up to 20V with a maximum dropout voltage of 2.2V at 40mA. The part is classified as Obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. Equivalent and substitute parts must maintain compatibility across output voltage, current capacity, thermal characteristics, and package form factors while meeting modern compliance requirements.

Key Parameters

Parameter	L78LR05E-MA-E
Manufacturer	onsemi
Output Voltage (Fixed)	5V
Output Current	150mA
Input Voltage (Max)	20V
Dropout Voltage (Max)	2.2V @ 40mA
Package / Case	TO-252-5, DPAK (4 Leads + Tab)
Operating Temperature	-30°C ~ 80°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the L78LR05E-MA-E is determined by the following critical parameters:

Output Voltage: Must be fixed at 5V
Output Current Capacity: Minimum 150mA required; higher ratings are acceptable
Input Voltage Range: Must accommodate up to 20V maximum input
Dropout Voltage: Must not exceed 2.2V at specified current levels
Package Compatibility: TO-252 family packages (DPAK variants) with appropriate lead configurations
Operating Temperature Range: Must cover -30°C to 80°C minimum
Compliance: ROHS3 compliance required for modern production

Substitute parts are grouped into two categories:

Category 1 - Higher Current Capacity Substitutes: Parts with 500mA output current (BA78M05FP-E2, BA178M05FP-E2) provide increased current headroom while maintaining 5V fixed output and TO-252 package compatibility. These are suitable for designs where the original 150mA specification can be exceeded without adverse effects.

Category 2 - Higher Current and Voltage Capability Substitute: The LM340SX-5.0/NOPB offers 1.5A output current and higher input voltage tolerance (35V), with TO-263 package variant, suitable for applications requiring greater thermal and current margin.

Category 3 - Parametric Equivalent: The L78LR05D-FA-E maintains identical electrical specifications and package form factor as the original part, providing direct functional equivalence.

Parameter Comparison

Parameter	L78LR05E-MA-E	BA78M05FP-E2	BA178M05FP-E2	LM340SX-5.0/NOPB	L78LR05D-FA-E
Manufacturer	onsemi	Rohm Semiconductor	Rohm Semiconductor	Texas Instruments	Sanyo
Output Voltage	5V	5V	5V	5V	5V
Output Current	150mA	500mA	500mA	1.5A	150mA
Input Voltage (Max)	20V	25V	25V	35V	20V
Dropout Voltage (Max)	2.2V @ 40mA	2V @ 500mA (Typ)	2V @ 500mA (Typ)	2V @ 1A	2.2V @ 40mA
PSRR	79dB (120Hz)	78dB (120Hz)	78dB (120Hz)	80dB (120Hz)	79dB (120Hz)
Operating Temperature	-30°C ~ 80°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 125°C	-30°C ~ 80°C
Package / Case	TO-252-5, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-263-4, D2PAK	TO-252-5, DPAK
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not applicable

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications)

The L78LR05D-FA-E from Sanyo is the parametric equivalent, maintaining 150mA output current, 20V maximum input voltage, and identical TO-252-5 package configuration. This part is currently Active in product status. Note that RoHS compliance status is listed as Not applicable for this variant; verify compliance requirements against your specific application standards before selection.

For Designs Tolerating Increased Current Capacity

BA78M05FP-E2 and BA178M05FP-E2 from Rohm Semiconductor both provide 500mA output current while maintaining 5V fixed output and TO-252 package family compatibility. Both parts are Active in product status and ROHS3 compliant. The BA78M05FP-E2 includes Over Current and Over Temperature protection features. These substitutes are suitable when circuit design permits higher current capability without functional impact.

For Applications Requiring Extended Voltage and Current Margin

The LM340SX-5.0/NOPB from Texas Instruments offers 1.5A output current and 35V maximum input voltage rating. This part uses a TO-263 (D2PAK) package variant, requiring PCB layout modification. The part is Active in product status and ROHS3 compliant. Operating temperature range extends to 125°C. Selection of this substitute requires verification of thermal management capability and PCB footprint compatibility.

Compliance Considerations

All recommended substitutes maintain ROHS3 compliance and EAR99 ECCN classification. Moisture Sensitivity Level (MSL) varies: BA78M05FP-E2 and BA178M05FP-E2 specify MSL 1 (Unlimited), while LM340SX-5.0/NOPB specifies MSL 3 (168 Hours). Verify storage and handling requirements against your supply chain protocols.

Frequently Asked Questions (FAQ)

Q: Can I use BA78M05FP-E2 or BA178M05FP-E2 as direct replacements for L78LR05E-MA-E?

A: These parts are functionally compatible substitutes with higher current capacity (500mA vs. 150mA). Both maintain 5V fixed output and operate within the same input voltage envelope. Package compatibility exists within the TO-252 DPAK family, though lead configuration differs (TO-252-3 vs. TO-252-5). Verify PCB layout accommodates the different lead count before implementation.

Q: What is the difference between BA78M05FP-E2 and BA178M05FP-E2?

A: Both parts provide identical electrical performance: 5V output, 500mA current, 25V maximum input voltage, and TO-252-3 package. The primary difference is quiescent current specification: BA178M05FP-E2 specifies 4.5 mA while BA78M05FP-E2 specifies 6 mA. BA78M05FP-E2 includes documented Over Current and Over Temperature protection features. Selection depends on power consumption requirements and desired protection feature set.

Q: Is the LM340SX-5.0/NOPB suitable for my application using L78LR05E-MA-E?

A: The LM340SX-5.0/NOPB provides 1.5A output current and 35V input voltage rating, offering significant performance margin. However, this part uses TO-263 (D2PAK) package, requiring PCB footprint redesign. Operating temperature range extends to 125°C, providing broader thermal coverage. Selection requires verification that increased current capability does not introduce stability or thermal management issues in your specific circuit topology.

Q: What are the package differences between these substitute parts?

A: L78LR05E-MA-E and L78LR05D-FA-E use TO-252-5 (DPAK with 4 Leads + Tab). BA78M05FP-E2 and BA178M05FP-E2 use TO-252-3 (DPAK with 2 Leads + Tab). LM340SX-5.0/NOPB uses TO-263-4 (D2PAK with 3 Leads + Tab). Lead count and pin configuration differences require PCB layout verification before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: BA78M05FP-E2, BA178M05FP-E2, and LM340SX-5.0/NOPB are all ROHS3 compliant. L78LR05D-FA-E from Sanyo lists RoHS status as Not applicable. Verify compliance requirements against your specific regulatory and customer requirements before final part selection.

Q: What is the impact of different dropout voltage specifications?

A: L78LR05E-MA-E and L78LR05D-FA-E specify 2.2V dropout at 40mA. BA78M05FP-E2 and BA178M05FP-E2 specify 2V dropout at 500mA (typical). LM340SX-5.0/NOPB specifies 2V dropout at 1A. Lower dropout voltage at higher current levels indicates improved efficiency in power-limited applications. Verify your circuit's input voltage margin accommodates the selected part's dropout characteristics.

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