LM2670SD-3.3 Equivalent & Substitute Parts

Part Overview

The LM2670SD-3.3 is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. It delivers a fixed 3.3V output at 3A from an 8V to 40V input range, operating at 260kHz switching frequency. The device is housed in a 14-VDFN package with exposed pad for surface mount applications and supports operating temperatures from -40°C to 125°C.

The LM2670SD-3.3 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Substiute Parts

LM2670SD-3.3

Texas InstrumentsIn Stock: 1014LM2670SD-3.3 Datasheet

Current PartRFQ

LM2670SD-3.3/NOPB

National SemiconductorIn Stock: 1199LM2670SD-3.3/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2670SD-3.3 is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 3.3V
• Output current rating of 3A
• Input voltage range of 8V to 40V minimum
• Switching frequency of 260kHz
• Buck topology with positive fixed output configuration
• Single output configuration
• 14-VDFN package with exposed pad
• Operating temperature range of -40°C to 125°C
• No synchronous rectifier requirement
• Surface mount technology

Parts meeting all these criteria are classified as direct equivalents and may be substituted without circuit modification.

Parameter Comparison

Engineering Selection Recommendations

The LM2670SD-3.3/NOPB is a direct equivalent substitute for the obsolete LM2670SD-3.3. Both parts share identical electrical specifications, package configuration, and thermal operating range. The primary distinction is product status: the LM2670SD-3.3/NOPB maintains active status with National Semiconductor, ensuring ongoing availability and supply chain support.

Selection of the LM2670SD-3.3/NOPB is appropriate for new designs, production continuity, and replacement applications where the LM2670SD-3.3 is no longer available. Both parts carry identical ECCN and HTSUS classifications, indicating equivalent regulatory and export compliance profiles.

Frequently Asked Questions (FAQ)

Q: Can the LM2670SD-3.3/NOPB be used as a direct replacement for the LM2670SD-3.3?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including output voltage, current rating, input range, switching frequency, package type, and operating temperature range. No circuit modifications are required.

Q: What is the significance of the "/NOPB" suffix in the part number?

A: The "/NOPB" designation indicates "No Plumbum" (lead-free) compliance. This is a manufacturing and packaging variant that does not affect electrical performance or functional compatibility.

Q: Are there any package differences between these parts?

A: Both parts use the 14-VDFN package with exposed pad. The supplier device package designation differs slightly (14-VSON 5x6 versus 14-VSON 6x5), but these represent the same physical package with equivalent footprint and thermal characteristics.

Q: Why is the LM2670SD-3.3 listed as obsolete?

A: Obsolescence reflects the manufacturer's discontinuation of this specific part number. The LM2670SD-3.3/NOPB remains in active production, providing a viable path for continued system support and new applications.

Q: Are compliance certifications identical between the two parts?

A: Yes. Both parts share the same ECCN (EAR99) and HTSUS code (8542.39.0001), confirming equivalent regulatory and export compliance status.