LM320K-15 Equivalent & Substitute Parts

Part Overview

The LM320K-15 is a linear voltage regulator IC designed to provide a fixed negative output of -15V at 1.5A in a TO-3-2 package. This device is classified as obsolete, making substitute parts necessary for new designs and production continuity. The LM320K-15 delivers regulated negative voltage with integrated over-current and over-temperature protection, suitable for applications requiring stable negative rail generation in legacy and new system designs.

Substiute Parts

LM320K-15

Texas InstrumentsIn Stock: 915LM320K-15 Datasheet

Current PartRFQ

SG7915K

Microchip TechnologyIn Stock: 1146SG7915K Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM320K-15 are selected based on strict electrical and mechanical compatibility criteria. The following parameters define valid substitution:

• Output voltage: -15V fixed (exact match required)
• Output current capability: 1.5A minimum
• Input voltage range: -35V maximum (minimum)
• Package type: TO-3 or TO-204AA mechanical compatibility
• Output configuration: Negative polarity
• Protection features: Over-current and over-temperature protection minimum

The SG7915K from Microchip Technology meets all substitution criteria while offering active product status and extended operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The SG7915K is the primary substitute for the LM320K-15. Both devices share identical electrical specifications for output voltage (-15V), output current (1.5A), and maximum input voltage (-35V). The SG7915K maintains mechanical compatibility through identical TO-3 packaging.

The SG7915K offers advantages in product lifecycle status: it is classified as active, ensuring continued availability and manufacturing support. The extended operating temperature range (-55°C to 125°C) provides broader environmental coverage compared to the LM320K-15 (0°C to 125°C). The SG7915K includes thermal shutdown protection in addition to over-current and over-temperature protection.

Both devices are RoHS non-compliant and carry identical REACH and ECCN classifications. Military-grade qualification (MIL-STD-883) is available for the SG7915K, supporting applications requiring enhanced reliability documentation.

Frequently Asked Questions (FAQ)

Q: Can the SG7915K directly replace the LM320K-15 in existing designs?

A: Yes. Both devices provide -15V fixed output at 1.5A in TO-3 packaging. Pin configuration and electrical performance are compatible for direct substitution.

Q: What are the differences in quiescent current between these devices?

A: The LM320K-15 draws 2 mA quiescent current, while the SG7915K draws 4 mA. This difference is negligible in most applications but should be evaluated in ultra-low-power designs.

Q: Does the SG7915K provide better noise performance?

A: The LM320K-15 provides 64dB PSRR at 120Hz, while the SG7915K provides 54dB PSRR at 120Hz. The LM320K-15 offers superior power supply rejection ratio performance. Applications requiring maximum noise rejection should evaluate this specification.

Q: Are there temperature range considerations for substitution?

A: The SG7915K operates from -55°C to 125°C, extending the lower temperature limit compared to the LM320K-15 (0°C to 125°C). For applications operating below 0°C, the SG7915K provides broader environmental coverage.

Q: What packaging options are available for both devices?

A: Both the LM320K-15 and SG7915K are available in TO-204AA and TO-3 packages. Mechanical compatibility is maintained across both package designations.

Q: Is the SG7915K suitable for military applications?

A: The SG7915K carries MIL-STD-883 qualification, supporting military-grade reliability requirements. The LM320K-15 does not specify military qualification.