LM2937ESX-8.0 Equivalent & Substitute Parts

Part Overview

The LM2937ESX-8.0 is a linear voltage regulator IC from Texas Instruments designed for positive fixed output applications. It delivers 500mA output current with an 8V fixed output voltage and operates across an input voltage range up to 26V. The device features integrated protection against over-temperature conditions, short circuits, transient voltage events, and mirror-image insertion errors.

The LM2937ESX-8.0 is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure continued availability for new designs, maintenance applications, and production continuity where this regulator is specified.

Substiute Parts

LM2937ESX-8.0

Texas InstrumentsIn Stock: 4643LM2937ESX-8.0 Datasheet

Current PartRFQ

LM2937ESX-8.0/NOPB

National SemiconductorIn Stock: 5632LM2937ESX-8.0/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM2937ESX-8.0 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Output voltage: 8V fixed
• Maximum output current: 500mA
• Maximum input voltage: 26V
• Maximum dropout voltage: 1V @ 500mA
• Package type: TO-263 (DDPAK-3)
• Output configuration: Positive fixed
• Protection features: Mirror-Image Insertion, Over Temperature, Short Circuit, Transient Voltage
• Operating temperature range: -40°C ~ 125°C (TJ)

Parts meeting all these parameters are classified as parametric equivalents and may be substituted in applications where the LM2937ESX-8.0 is specified, provided that packaging and compliance requirements are satisfied.

Parameter Comparison

Engineering Selection Recommendations

The LM2937ESX-8.0/NOPB from National Semiconductor is a parametric equivalent substitute. Both parts share identical electrical specifications, output voltage, current ratings, dropout voltage, protection features, and operating temperature range. Both are packaged in TO-263 (DDPAK-3) surface mount configuration.

The primary distinction is product status: the original LM2937ESX-8.0 is obsolete, while the LM2937ESX-8.0/NOPB is active. For applications requiring continued component availability and supply chain reliability, the active part is the appropriate selection.

Both parts are RoHS non-compliant and carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. Moisture sensitivity level is 3 (168 Hours) for the original part; verify MSL specifications for the substitute if storage conditions exceed standard industrial environments.

Frequently Asked Questions (FAQ)

Q: Can the LM2937ESX-8.0/NOPB be used as a direct replacement for the LM2937ESX-8.0?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, output voltage (8V), current rating (500mA), dropout voltage (1V @ 500mA), protection features, and TO-263 packaging. Pin configuration and PCB layout compatibility are maintained.

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

A: The "/NOPB" suffix indicates the part is supplied in bulk packaging without lead-free plating. This is a packaging designation and does not affect electrical performance or substitution eligibility.

Q: Why is the original LM2937ESX-8.0 marked as obsolete?

A: Obsolescence indicates the manufacturer has discontinued production. The LM2937ESX-8.0/NOPB remains in active production and is the recommended source for new inventory.

Q: Are there any compliance differences between the two parts?

A: Both parts share identical RoHS status (non-compliant), ECCN classification (EAR99), and HTSUS code (8542.39.0001). Verify MSL (Moisture Sensitivity Level) handling requirements for your specific storage and assembly environment.

Q: What are the critical parameters that must match for substitution?

A: Output voltage (8V), output current (500mA), input voltage rating (26V), dropout voltage (1V @ 500mA), package type (TO-263), and protection features (Mirror-Image Insertion, Over Temperature, Short Circuit, Transient Voltage) must all match exactly.