NJM78M24FA Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The NJM78M24FA is a linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc., designed to provide a fixed positive 24V output at 500mA. This device is classified as a Power Management (PMIC) component and is currently in active product status. The NJM78M24FA is packaged in TO-220-3 Full Pack configuration for through-hole mounting applications.

Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility within specified parameters.

Substiute Parts

NJM78M24FA

Nisshinbo Micro Devices Inc.In Stock: 1988NJM78M24FA Datasheet

Current PartRFQ

BA78M24CP-E2

Rohm SemiconductorIn Stock: 2078BA78M24CP-E2 Datasheet

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L7824CP

STMicroelectronicsIn Stock: 4308L7824CP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the NJM78M24FA are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Fixed output voltage of 24V
• Positive output configuration
• Single regulator output
• Through-hole mounting capability
• TO-220 package family
• Over temperature and short circuit protection

Secondary Compatibility Criteria:

• Output current rating equal to or greater than 500mA
• Maximum input voltage of 33V or higher
• Operating temperature range that encompasses or exceeds -40°C to 85°C
• RoHS and REACH compliance status
• Quiescent current within acceptable operational parameters

The substitute parts BA78M24CP-E2 and L7824CP meet these criteria with variations in output current capacity, input voltage ratings, and product status as detailed in the parameter comparison table.

Parameter Comparison

Engineering Selection Recommendations

NJM78M24FA (Primary Component): The NJM78M24FA maintains active product status with confirmed inventory availability of 1899 pieces. This component is recommended for new designs and applications where supply continuity is prioritized. RoHS compliance and standard TO-220-3 Full Pack configuration support standard PCB assembly processes.

L7824CP (Preferred Substitute): The L7824CP manufactured by STMicroelectronics is the recommended substitute for the NJM78M24FA. Both components share identical output voltage (24V), matching input voltage maximum (40V), and identical package configuration (TO-220-3 Full Pack). The L7824CP provides higher output current capacity (1.5A versus 500mA), enabling use in applications requiring greater current delivery. Active product status and ROHS3 compliance ensure long-term availability and regulatory alignment. The extended operating temperature range (0°C to 125°C) provides broader thermal operational capability. Inventory availability of 4241 pieces supports immediate procurement.

BA78M24CP-E2 (Secondary Substitute): The BA78M24CP-E2 manufactured by Rohm Semiconductor provides electrical compatibility with matching output voltage (24V) and output current (500mA). However, this component carries obsolete product status, indicating discontinued manufacturing and limited future availability. The reduced maximum input voltage (33V versus 40V) restricts application scope compared to the primary component. The TO-220-3 Cropped Leads package variant may require PCB layout verification for mechanical clearance compatibility. This substitute is suitable only for legacy system maintenance or when L7824CP availability is constrained.

Frequently Asked Questions (FAQ)

Q1: Can the L7824CP directly replace the NJM78M24FA in existing designs?

A: Yes. Both components provide 24V fixed output voltage, share identical TO-220-3 Full Pack packaging, and support through-hole mounting. The L7824CP's higher current rating (1.5A) is backward compatible with 500mA applications. No PCB modifications are required for mechanical or electrical substitution.

Q2: What is the significance of the BA78M24CP-E2 obsolete status?

A: Obsolete product status indicates that Rohm Semiconductor has discontinued manufacturing. This component should not be selected for new designs. Existing inventory may be available through secondary distributors, but long-term supply cannot be guaranteed. Use only for legacy system repairs where alternative substitutes are unavailable.

Q3: How do the input voltage ratings affect substitution decisions?

A: The NJM78M24FA and L7824CP both accept maximum input voltages of 40V, providing equivalent design flexibility. The BA78M24CP-E2 accepts maximum 33V input, restricting its use to applications with lower input voltage sources. Verify your circuit's input voltage specification before selecting BA78M24CP-E2.

Q4: Are there thermal performance differences between these regulators?

A: The L7824CP operates across a wider temperature range (0°C to 125°C) compared to the NJM78M24FA (-40°C to 85°C). For applications requiring extended low-temperature operation below 0°C, the NJM78M24FA or BA78M24CP-E2 are required. For high-temperature applications above 85°C, the L7824CP is necessary.

Q5: What packaging considerations apply to the BA78M24CP-E2?

A: The BA78M24CP-E2 uses TO-220-3 Cropped Leads configuration, while the NJM78M24FA uses TO-220-3 Full Pack. Cropped leads have shorter lead lengths, potentially affecting PCB hole spacing and mechanical fit. Verify PCB design compatibility before substitution. The L7824CP uses standard Full Pack leads, eliminating this concern.

Q6: Do all three components provide equivalent protection features?

A: The NJM78M24FA and L7824CP both provide over temperature and short circuit protection. The BA78M24CP-E2 provides over current and over temperature protection. All three components include thermal shutdown capability. Protection feature differences do not prevent substitution but should be noted for system-level safety analysis.

Q7: How do PSRR values compare across these regulators?

A: The NJM78M24FA provides 60dB PSRR at 120Hz, the BA78M24CP-E2 provides 55dB, and the L7824CP provides 50dB. Higher PSRR values indicate superior noise rejection. For noise-sensitive applications, the NJM78M24FA offers the best performance. The L7824CP's lower PSRR remains acceptable for standard industrial applications.

Q8: Which substitute is recommended for new product development?

A: The L7824CP is the recommended substitute for new designs. It maintains active product status, provides higher current capacity, supports extended temperature operation, and ensures long-term supply availability. The NJM78M24FA remains the primary choice when its specific performance characteristics are required.