NJM78L02A Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The NJM78L02A is a linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc., designed to provide a fixed positive output of 2.6V at 100mA. This device is classified as a Power Management (PMIC) component and is packaged in a TO-92-3 (TO-226AA) through-hole configuration. The NJM78L02A is currently listed as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

Substiute Parts

NJM78L02A

Nisshinbo Micro Devices Inc.In Stock: 1114NJM78L02A Datasheet

Current PartRFQ

UA78L02ACLP

Texas InstrumentsIn Stock: 1048UA78L02ACLP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the NJM78L02A is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Output voltage: 2.6V fixed positive output
• Output current capability: 100mA minimum
• Package type: TO-92-3 through-hole configuration
• Number of regulators: Single output
• Output configuration: Positive fixed regulator

Allowable Variation Parameters:

• Maximum input voltage: Substitute must support at least the application's input voltage requirement
• Quiescent current: May vary within acceptable system power budget limits
• PSRR: May vary; lower values acceptable if system noise requirements are met
• Operating temperature range: May be narrower or wider depending on application environment
• Protection features: Substitute may include additional protection mechanisms
• RoHS compliance: May differ from original part

The UA78L02ACLP from Texas Instruments qualifies as a functional substitute based on matching the core electrical output specifications (2.6V fixed, 100mA output) and identical TO-92-3 package configuration.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: UA78L02ACLP

The UA78L02ACLP from Texas Instruments is the primary equivalent substitute for the NJM78L02A. Both devices deliver identical fixed output voltage (2.6V) and output current (100mA) in the same TO-92-3 package configuration, enabling direct pin-compatible replacement in existing circuit designs.

Compliance Considerations:

The UA78L02ACLP holds ROHS3 compliance status, whereas the NJM78L02A is RoHS non-compliant. For applications subject to RoHS regulatory requirements, the UA78L02ACLP provides compliance advantage. Both devices are classified as obsolete products.

Input Voltage Difference:

The NJM78L02A supports maximum input voltage of 30V, while the UA78L02ACLP supports 20V maximum input. Circuit designs operating at input voltages between 20V and 30V require verification that the UA78L02ACLP's 20V maximum rating is not exceeded.

Protection Feature Enhancement:

The UA78L02ACLP includes reverse polarity protection in addition to over current, over temperature, and short circuit protection. The NJM78L02A provides over temperature and short circuit protection only. This additional protection in the substitute part does not create incompatibility and may provide enhanced system robustness.

Operating Temperature Range:

The NJM78L02A operates from -40°C to 85°C, while the UA78L02ACLP operates from 0°C to 125°C. Applications requiring operation below 0°C must retain the original NJM78L02A or identify alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can the UA78L02ACLP directly replace the NJM78L02A in existing designs?

A: Yes, the UA78L02ACLP is pin-compatible and provides identical output voltage (2.6V) and current (100mA) specifications. Direct substitution is possible provided the application input voltage does not exceed 20V and the operating temperature range requirement is satisfied (0°C to 125°C for the substitute).

Q: What is the key difference in maximum input voltage between these parts?

A: The NJM78L02A accepts input voltages up to 30V, while the UA78L02ACLP is rated for maximum 20V input. Applications using input voltages between 20V and 30V must confirm the UA78L02ACLP rating is not exceeded before substitution.

Q: Are there package differences between the NJM78L02A and UA78L02ACLP?

A: No. Both devices use the TO-92-3 (TO-226AA) through-hole package configuration. Pin assignments are identical, enabling direct board-level replacement without layout modifications.

Q: Does the lower PSRR of the UA78L02ACLP affect substitution suitability?

A: The UA78L02ACLP provides 51dB PSRR at 120Hz compared to 73dB for the NJM78L02A. Applications with stringent noise rejection requirements must evaluate whether the 22dB difference impacts system performance. Applications with standard noise filtering typically accommodate this difference.

Q: What additional protection does the UA78L02ACLP provide?

A: The UA78L02ACLP includes reverse polarity protection in addition to over current, over temperature, and short circuit protection. The NJM78L02A provides over temperature and short circuit protection. The additional reverse polarity protection in the substitute does not create incompatibility.

Q: Is the UA78L02ACLP suitable for low-temperature applications?

A: The UA78L02ACLP operates from 0°C to 125°C. Applications requiring operation below 0°C cannot use this substitute. The original NJM78L02A supports -40°C to 85°C operation and must be retained for such applications.

Q: What is the significance of RoHS compliance difference?

A: The UA78L02ACLP is ROHS3 compliant, while the NJM78L02A is RoHS non-compliant. For applications or supply chains subject to RoHS regulatory requirements, the UA78L02ACLP provides compliance advantage. Both devices are obsolete products.