NJM78L05UATE2 Equivalent & Substitute Parts

Part Overview

The NJM78L05UATE2 is a linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc., designed to provide a fixed positive 5V output at 100mA in a surface-mount SOT-89 package. This component is classified as obsolete, with limited inventory availability (771 pieces). Due to its obsolete status and constrained supply, identifying equivalent and substitute parts is essential for design continuity and production planning. Substitute parts must maintain electrical compatibility across output voltage, current capacity, input voltage range, and thermal protection characteristics while accommodating variations in quiescent current, PSRR performance, and operating temperature ranges.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	5V	V
Output Current	100	mA
Input Voltage (Max)	30	V
Quiescent Current	6	mA
PSRR @ 120Hz	69	dB
Operating Temperature Range	-40 to 85	°C
Package Type	SOT-89 (TO-243AA)
Protection Features	Over Temperature, Short Circuit
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the NJM78L05UATE2 are classified based on strict electrical and mechanical compatibility criteria. All substitute candidates must satisfy the following mandatory parameters:

Core Compatibility Requirements:

Fixed output voltage of 5V
Output current rating of 100mA minimum
Maximum input voltage of 30V or greater
Surface-mount SOT-89 package (TO-243AA case)
Positive output configuration with single regulator
Over-temperature and short-circuit protection

Substitution Categories:

Parametric Equivalent: Parts that match all electrical specifications and are from the same manufacturer (Nisshinbo Micro Devices Inc.) with identical base product number NJM78L05.

Similar Substitute: Parts from alternative manufacturers (Diodes Incorporated, STMicroelectronics, Texas Instruments, MAXVISION, Micro Commercial Co) that meet core electrical requirements but may exhibit variations in quiescent current (5.5mA typical), PSRR performance (49-80dB range), dropout voltage characteristics, or operating temperature ranges.

Variations in the following parameters are acceptable within the substitute category:

Quiescent current: 5.5mA to 6mA
PSRR: 49dB to 80dB @ 120Hz
Dropout voltage: 1.7V to 1.8V @ specified current
Operating temperature: -40°C to 125°C (extended range acceptable)
RoHS compliance status (both compliant and non-compliant options available)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Quiescent Current	PSRR @ 120Hz	Operating Temperature	Package	Product Status	RoHS Status
NJM78L05UATE2	Nisshinbo Micro Devices	5V	100mA	30V	6mA	69dB	-40 to 85°C	SOT-89	Obsolete	Non-compliant
NJM78L05UA-TE1	Nisshinbo Micro Devices	5V	100mA	30V	6mA	69dB	-40 to 85°C	SOT-89	Active	Compliant
AS78L05RTR-E1	Diodes Incorporated	5V	100mA	30V	5.5mA	62dB	-40 to 125°C	SOT-89-3	Active	ROHS3 Compliant
AS78L05RTR-G1	Diodes Incorporated	5V	100mA	30V	5.5mA	62dB	-40 to 125°C	SOT-89-3	Active	ROHS3 Compliant
L78L05ABUTR	MAXVISION	5V	100mA	30V	5.5mA	49dB	-40 to 125°C	SOT-89-3	Active	Not specified
L78L05ACUTR	STMicroelectronics	5V	100mA	30V	5.5mA	49dB	0 to 125°C	SOT-89-3	Active	ROHS3 Compliant
MC78L05F-TP-HF	Micro Commercial Co	5V	100mA	30V	5.5mA	80dB	-20 to 120°C	SOT-89	Active	Not specified
UA78L05ACPK	Texas Instruments	5V	100mA	20V	Not specified	49dB	0 to 125°C	SOT-89-3	Active	ROHS3 Compliant
UA78L05AIPK	Texas Instruments	5V	100mA	20V	Not specified	49dB	-40 to 125°C	SOT-89-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Parametric Equivalent:

NJM78L05UA-TE1 is the primary recommended substitute. Manufactured by Nisshinbo Micro Devices Inc., this part maintains identical electrical specifications to the NJM78L05UATE2 (5V output, 100mA, 6mA quiescent current, 69dB PSRR, -40 to 85°C operating range) while offering active product status and RoHS compliance. Inventory availability is significantly higher (35,200 pieces), ensuring supply continuity. This part is suitable for direct replacement in existing designs without circuit modification.

Tier 2 - Active Substitutes with Extended Temperature Range:

AS78L05RTR-E1 and AS78L05RTR-G1 (Diodes Incorporated) are functionally equivalent with extended operating temperature range (-40 to 125°C). Both parts maintain 5V output, 100mA current, and 30V maximum input voltage. Quiescent current is reduced to 5.5mA, and PSRR is 62dB. Both are ROHS3 compliant with high inventory availability (637,850 and 30,200 pieces respectively). These parts are suitable for applications requiring extended temperature performance.

Tier 3 - Active Substitutes with Reduced Input Voltage Rating:

UA78L05AIPK (Texas Instruments) provides the widest operating temperature range (-40 to 125°C) and ROHS3 compliance with 155,300 pieces in stock. However, maximum input voltage is limited to 20V compared to the 30V specification of the main part. This part is suitable only for applications where input voltage does not exceed 20V.

UA78L05ACPK (Texas Instruments) is similar to UA78L05AIPK but with narrower operating temperature range (0 to 125°C) and higher inventory (196,293 pieces). Maximum input voltage is also 20V.

Tier 4 - Alternative Substitutes:

L78L05ACUTR (STMicroelectronics) offers ROHS3 compliance and active status with 160,300 pieces available. Operating temperature range is 0 to 125°C. This part is suitable for applications not requiring -40°C operation.

L78L05ABUTR (MAXVISION) provides active status with 447,600 pieces in stock and extended temperature range (-40 to 125°C). PSRR is reduced to 49dB.

MC78L05F-TP-HF (Micro Commercial Co) offers the highest PSRR performance (80dB) among substitutes but with limited inventory (750 pieces) and narrower operating temperature range (-20 to 120°C).

Compliance Considerations:

The original NJM78L05UATE2 is RoHS non-compliant. For applications requiring RoHS compliance, NJM78L05UA-TE1, AS78L05RTR-E1, AS78L05RTR-G1, L78L05ACUTR, UA78L05ACPK, and UA78L05AIPK all provide ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q1: Can NJM78L05UA-TE1 be used as a direct replacement for NJM78L05UATE2?

A: Yes. NJM78L05UA-TE1 is a parametric equivalent from the same manufacturer with identical electrical specifications (5V output, 100mA, 6mA quiescent current, 69dB PSRR, -40 to 85°C operating range). The only differences are active product status and RoHS compliance. No circuit modifications are required.

Q2: What is the difference between SOT-89 and SOT-89-3 package designations?

A: Both designations refer to the same physical package (TO-243AA) with three leads. The "-3" suffix in some manufacturer part numbers explicitly indicates the three-lead configuration. These packages are mechanically and electrically compatible for PCB mounting and circuit operation.

Q3: Why do some substitute parts have lower quiescent current (5.5mA vs 6mA)?

A: Quiescent current variation within this range (5.5-6mA) is typical across different manufacturers and process technologies. Lower quiescent current reduces standby power consumption and is generally beneficial. This variation does not affect functional compatibility or circuit performance.

Q4: Can I use UA78L05ACPK or UA78L05AIPK if my circuit has a 30V input supply?

A: No. Both Texas Instruments UA78L05 variants are rated for maximum 20V input voltage. Using these parts with 30V input exceeds their absolute maximum ratings and will cause device failure. Use only parts rated for 30V maximum input voltage (NJM78L05UA-TE1, AS78L05RTR-E1, AS78L05RTR-G1, L78L05ABUTR, L78L05ACUTR, or MC78L05F-TP-HF).

Q5: Which substitute offers the best noise performance?

A: MC78L05F-TP-HF (Micro Commercial Co) provides the highest PSRR at 80dB @ 120Hz, compared to 69dB for the original part and 49-62dB for other substitutes. However, inventory is limited (750 pieces). For applications requiring superior noise rejection with better availability, NJM78L05UA-TE1 maintains the original 69dB PSRR specification.

Q6: Are there any operating temperature limitations I should consider when selecting a substitute?

A: The original NJM78L05UATE2 operates from -40 to 85°C. Most active substitutes extend this range to -40 to 125°C, which is beneficial. However, L78L05ACUTR and UA78L05ACPK have minimum operating temperature of 0°C, unsuitable for applications requiring -40°C operation. MC78L05F-TP-HF has minimum operating temperature of -20°C. Verify your application's temperature requirements before selection.

Q7: What is the significance of RoHS compliance status?

A: RoHS (Restriction of Hazardous Substances) compliance indicates the part does not contain restricted materials such as lead, cadmium, or hexavalent chromium. If your application or end-market requires RoHS compliance, select from: NJM78L05UA-TE1, AS78L05RTR-E1, AS78L05RTR-G1, L78L05ACUTR, UA78L05ACPK, or UA78L05AIPK. The original NJM78L05UATE2 is non-compliant.

Q8: How do I determine which substitute has the best long-term availability?

A: Inventory levels provide one indicator. NJM78L05UA-TE1 (35,200 pieces), L78L05ABUTR (447,600 pieces), and AS78L05RTR-E1 (637,850 pieces) show strong availability. However, product status is more critical: all recommended substitutes have "Active" status, indicating ongoing manufacturer support. The original NJM78L05UATE2 is obsolete, making any active substitute preferable for new designs.

Q9: Can I mix different substitute parts in the same production batch?

A: Functionally, yes, provided all parts meet your circuit's electrical requirements (5V output, 100mA, appropriate input voltage rating, and operating temperature range). However, for consistency and traceability, it is preferable to standardize on a single part number per design revision. If multiple substitutes are used, document the approved alternatives in your design specifications.

Q10: What protection features should I verify when selecting a substitute?

A: All listed substitutes include over-temperature and short-circuit protection as minimum requirements. Some parts (L78L05ABUTR, L78L05ACUTR, MC78L05F-TP-HF, UA78L05ACPK, UA78L05AIPK) add over-current protection. UA78L05ACPK and UA78L05AIPK also include reverse-polarity protection. These additional protections enhance circuit robustness but are not required for basic compatibility.

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