LM117H Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM117H is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 1.5A output current with adjustable voltage regulation from 1.25V to 37V, housed in a TO-3 metal can package. The device is classified as Last Time Buy, indicating limited future availability. Identifying equivalent and substitute parts ensures design continuity and supply chain resilience for applications currently utilizing this regulator.

Substiute Parts

LM117H

Texas InstrumentsIn Stock: 2244LM117H Datasheet

Current PartRFQ

LM117H/NOPB

Texas InstrumentsIn Stock: 6775LM117H/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM117H is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must match the following criteria:

• Output configuration: Positive adjustable
• Output current rating: 1.5A
• Input voltage maximum: 40V
• Output voltage range: 1.25V to 37V
• Quiescent current: 5 mA
• PSRR specification: 80dB ~ 65dB (120Hz)
• Protection features: Over Current, Over Temperature, Short Circuit
• Package type: TO-3 metal can (TO-205AD, TO-39-3)
• Mounting type: Through Hole
• Operating temperature range: -55°C ~ 150°C (TJ)
• RoHS compliance: ROHS3 Compliant

The LM117H/NOPB is identified as a parametric equivalent based on identical electrical specifications and package configuration.

Parameter Comparison

Engineering Selection Recommendations

Both the LM117H and LM117H/NOPB are classified as Last Time Buy products, indicating that future availability from Texas Instruments is limited. The LM117H/NOPB variant carries the "/NOPB" suffix, which denotes a lead-free, RoHS3-compliant version without plumbum (lead). Both parts maintain identical electrical performance and package specifications.

For new designs or long-term production requirements, inventory planning should account for the Last Time Buy status of both parts. The LM117H/NOPB is suitable for applications requiring explicit lead-free compliance documentation. Current inventory levels show 6735 units of LM117H/NOPB available compared to 2144 units of LM117H, providing greater supply availability for the lead-free variant.

Frequently Asked Questions (FAQ)

Q: Can LM117H/NOPB be used as a direct replacement for LM117H?

A: Yes. The LM117H/NOPB is a parametric equivalent with identical electrical specifications, output current rating, voltage ranges, protection features, and TO-3 package configuration. Both parts are pin-compatible and functionally interchangeable.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix denotes a lead-free, RoHS3-compliant variant without plumbum (lead). This designation is used for applications requiring explicit lead-free compliance documentation and environmental compliance certifications.

Q: Are there any differences in thermal performance between LM117H and LM117H/NOPB?

A: Both parts share identical operating temperature ranges (-55°C ~ 150°C TJ) and quiescent current specifications (5 mA). No thermal performance differences exist between the variants.

Q: What is the significance of the Last Time Buy status?

A: Last Time Buy indicates that Texas Instruments has discontinued or will discontinue production of these parts. Future availability is limited. Design teams should evaluate long-term supply requirements and consider alternative regulators for new product development.

Q: Are both parts suitable for through-hole PCB assembly?

A: Yes. Both LM117H and LM117H/NOPB use TO-3 metal can packages (TO-205AD, TO-39-3) designed for through-hole mounting. They are compatible with standard through-hole assembly processes.

Q: What protection features are included in these regulators?

A: Both parts include Over Current, Over Temperature, and Short Circuit protection. These features safeguard the regulator and downstream circuitry from fault conditions.