NJM7905FA Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The NJM7905FA is a linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc., designed to provide a fixed negative output of -5V at 1.5A in a TO-220-3 package. This device is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement continuity. The NJM7905FA serves applications requiring negative voltage regulation with thermal and short-circuit protection in through-hole mounting configurations.

Substiute Parts

NJM7905FA

Nisshinbo Micro Devices Inc.In Stock: 1589NJM7905FA Datasheet

Current PartRFQ

UA7905CKCS

Texas InstrumentsIn Stock: 3018UA7905CKCS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NJM7905FA is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Output voltage: -5V fixed
• Output current capability: 1.5A minimum
• Output configuration: Negative
• Package type: TO-220-3 (through-hole mounting)
• Number of regulators: 1 output

Acceptable Variation Parameters:

• Maximum input voltage: Substitute must support at least -25V (NJM7905FA supports -35V; lower ratings are acceptable for most applications)
• Operating temperature range: Substitute may have different range; -40°C ~ 85°C is the reference specification
• Protection features: Substitute may include additional protection (Over Current in addition to Over Temperature and Short Circuit)
• Quiescent current: 5 mA is the reference; variations are acceptable within typical regulator specifications
• PSRR: 60dB (120Hz) is the reference specification

The UA7905CKCS manufactured by Texas Instruments meets all critical matching parameters and qualifies as a direct substitute for the NJM7905FA.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: UA7905CKCS

The UA7905CKCS is the qualified substitute for the NJM7905FA based on the following engineering criteria:

1. Electrical Equivalence: Both devices provide -5V fixed output at 1.5A with identical output configuration, type, and PSRR specification.

2. Package Compatibility: Both use TO-220-3 through-hole mounting, ensuring direct PCB compatibility without layout modifications.

3. Compliance Status: The UA7905CKCS holds ROHS3 Compliant certification, meeting current regulatory requirements. The NJM7905FA is RoHS Compliant. Both are REACH Unaffected and classified as EAR99.

4. Inventory Availability: The UA7905CKCS has 2988 Pcs in stock with Last Time Buy status, providing procurement security compared to the obsolete NJM7905FA.

5. Enhanced Protection: The UA7905CKCS includes Over Current protection in addition to Over Temperature and Short Circuit protection, providing additional circuit safeguarding.

6. Input Voltage Consideration: The UA7905CKCS supports maximum input voltage of -25V compared to the NJM7905FA's -35V. Applications requiring input voltages below -25V require design review.

7. Operating Temperature Range: The UA7905CKCS operates from 0°C ~ 125°C versus the NJM7905FA's -40°C ~ 85°C. Applications requiring operation below 0°C require alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can the UA7905CKCS directly replace the NJM7905FA without PCB modifications?

A: Yes. Both devices use identical TO-220-3 through-hole packaging with the same pin configuration and electrical output specifications (-5V, 1.5A). Direct pin-for-pin substitution is possible without PCB layout changes.

Q: What is the key difference between the NJM7905FA and UA7905CKCS?

A: The primary difference is maximum input voltage rating: NJM7905FA supports -35V while UA7905CKCS supports -25V. For applications with input voltages between -25V and -35V, the UA7905CKCS cannot be used. The UA7905CKCS also includes Over Current protection and operates at a higher temperature range (0°C ~ 125°C versus -40°C ~ 85°C).

Q: Is the UA7905CKCS suitable for low-temperature applications below 0°C?

A: No. The UA7905CKCS operating temperature range begins at 0°C. Applications requiring operation at -40°C must retain the NJM7905FA or identify alternative regulators with extended low-temperature specifications.

Q: Does the UA7905CKCS provide better protection than the NJM7905FA?

A: The UA7905CKCS includes Over Current protection in addition to Over Temperature and Short Circuit protection. The NJM7905FA provides Over Temperature and Short Circuit protection. The additional Over Current protection in the UA7905CKCS offers enhanced circuit safeguarding.

Q: What is the product status difference between these parts?

A: The NJM7905FA is classified as Obsolete, indicating end-of-life status with no future availability. The UA7905CKCS is classified as Last Time Buy, indicating limited remaining inventory before discontinuation. For new designs, the UA7905CKCS is the recommended choice.

Q: Are there compliance or certification differences?

A: Both devices are REACH Unaffected and EAR99 classified. The NJM7905FA is RoHS Compliant while the UA7905CKCS is ROHS3 Compliant, representing updated regulatory alignment. Both meet current environmental and export compliance requirements.

Q: Can the UA7905CKCS be used in applications with input voltages exceeding -25V?

A: No. The UA7905CKCS maximum input voltage rating is -25V. Exceeding this specification may cause device damage or malfunction. Applications requiring input voltages between -25V and -35V require alternative component selection or design modification.