LM340LAH-12/NOPB Equivalent & Substitute Parts

Part Overview

The LM340LAH-12/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed 12V positive output at 100mA. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The part operates across a 0°C to 70°C temperature range and is housed in a TO-39-3 metal can package suitable for through-hole mounting applications.

Substiute Parts

LM340LAH-12/NOPB

Texas InstrumentsIn Stock: 968LM340LAH-12/NOPB Datasheet

Current PartRFQ

SG7812T-JAN

Microchip TechnologyIn Stock: 911SG7812T-JAN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM340LAH-12/NOPB is determined by the following critical parameters:

• Output voltage matching at 12V fixed regulation
• Positive output configuration
• Single regulator topology
• Maximum input voltage rating of 35V or greater
• Through-hole mounting in TO-39 package family
• ROHS3 compliance for environmental standards

The SG7812T-JAN qualifies as a direct substitute based on these criteria. Both devices share identical output voltage specifications, input voltage ratings, package form factor, and regulatory compliance status. The substitute part provides enhanced current capability (500mA versus 100mA) and extended operating temperature range, making it suitable for applications requiring the original part's specifications while offering improved performance margins.

Parameter Comparison

Engineering Selection Recommendations

The SG7812T-JAN is qualified as a direct replacement for the obsolete LM340LAH-12/NOPB. Both devices maintain identical output voltage regulation at 12V and share compatible TO-39-3 metal can packaging for through-hole applications. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

The SG7812T-JAN carries military-grade qualification under MIL-STD-883, providing enhanced reliability assurance. Its extended operating temperature range (-55°C to 125°C) encompasses the original part's specification window (0°C to 70°C). The increased output current capability (500mA) provides additional design margin without compromising compatibility with circuits designed for the original 100mA specification.

Both parts maintain ROHS3 compliance and identical maximum input voltage ratings of 35V, ensuring electrical compatibility in existing circuit topologies.

Frequently Asked Questions (FAQ)

Q: Can the SG7812T-JAN directly replace the LM340LAH-12/NOPB in existing designs?

A: Yes. Both devices provide fixed 12V positive output regulation in TO-39-3 metal can packages with identical pinout and electrical interface. The substitute part's higher current rating and extended temperature range do not introduce compatibility issues in circuits designed for the original specification.

Q: What are the key differences between these parts?

A: The primary differences are product status (obsolete versus active), output current capability (100mA versus 500mA), operating temperature range (0°C–70°C versus -55°C–125°C), and military qualification (absent versus MIL-STD-883). Output voltage, input voltage rating, and package form factor remain identical.

Q: Are there any package compatibility concerns?

A: No. Both parts use the TO-39-3 metal can package with through-hole mounting. Pin configuration and mechanical dimensions are compatible for direct board-level substitution.

Q: Does the higher current rating of the SG7812T-JAN affect circuit operation?

A: No. The substitute part's 500mA output capability is a superset of the original 100mA specification. Circuits designed for 100mA operation will function identically with the higher-rated device.

Q: Are both parts RoHS compliant?

A: Yes. Both the LM340LAH-12/NOPB and SG7812T-JAN are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.