LM3670MF-1.6 Equivalent & Substitute Parts

Part Overview

The LM3670MF-1.6 is a buck switching regulator IC manufactured by Texas Instruments, designed for positive fixed 1.6V output applications. This device delivers 350mA output current with a 1MHz switching frequency and integrated synchronous rectification. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The LM3670MF-1.6/NOPB variant provides an active alternative with identical electrical and mechanical specifications.

Substiute Parts

LM3670MF-1.6

Texas InstrumentsIn Stock: 2661LM3670MF-1.6 Datasheet

Current PartRFQ

LM3670MF-1.6/NOPB

National SemiconductorIn Stock: 2915LM3670MF-1.6/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM3670MF-1.6 is determined by strict equivalence across the following critical parameters:

• Input voltage range: 2.5V to 5.5V
• Fixed output voltage: 1.6V
• Output current capacity: 350mA
• Switching frequency: 1MHz
• Synchronous rectification capability
• Package type: SOT-23-5 (SC-74A, SOT-753)
• Operating temperature range: -40°C to 85°C
• Surface mount configuration

The LM3670MF-1.6/NOPB meets all electrical and mechanical requirements for direct substitution. This variant differs only in product status (active versus obsolete) and packaging designation (bulk versus standard), with no impact on functional performance or circuit compatibility.

Parameter Comparison

Engineering Selection Recommendations

The LM3670MF-1.6/NOPB is the direct equivalent for the obsolete LM3670MF-1.6. Selection between these parts is determined by product availability and procurement status rather than technical performance. The LM3670MF-1.6/NOPB carries active product status, ensuring ongoing manufacturer support and supply chain availability. Both parts comply with identical electrical specifications, thermal operating ranges, and packaging requirements. The NOPB designation indicates lead-free (no-lead) compliance, which may be relevant for RoHS-compliant applications despite the base part's RoHS non-compliant classification. Inventory availability should be verified with component distributors, as the LM3670MF-1.6 shows 2610 units in stock while the LM3670MF-1.6/NOPB shows 2837 units.

Frequently Asked Questions (FAQ)

Q: Can the LM3670MF-1.6/NOPB replace the LM3670MF-1.6 in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. The LM3670MF-1.6/NOPB operates at the same input voltage range (2.5V–5.5V), delivers identical 1.6V fixed output at 350mA, and uses the same SOT-23-5 package. No circuit modifications are required.

Q: What is the difference between LM3670MF-1.6 and LM3670MF-1.6/NOPB?

A: The primary difference is product status. The LM3670MF-1.6 is classified as obsolete, while the LM3670MF-1.6/NOPB is active. The NOPB suffix indicates lead-free packaging. Electrical performance and thermal specifications are identical.

Q: Are there any compliance differences between these parts?

A: Both parts carry the same ECCN (EAR99) and HTSUS (8542.39.0001) classifications. The base LM3670MF-1.6 is RoHS non-compliant. The NOPB variant's lead-free designation does not alter the overall RoHS compliance status of the part.

Q: What is the operating temperature range for these regulators?

A: Both the LM3670MF-1.6 and LM3670MF-1.6/NOPB operate from -40°C to 85°C (TA). This range is suitable for industrial and commercial applications.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes. Both parts use the SC-74A SOT-753 package (SOT-23-5 supplier designation), ensuring identical PCB footprint and pin configuration. No layout modifications are necessary.

Q: What is the switching frequency of the LM3670MF-1.6?

A: The switching frequency is 1MHz for both the LM3670MF-1.6 and LM3670MF-1.6/NOPB. This frequency supports compact filter designs and reduces EMI in the audio frequency range.

Q: Does the LM3670MF-1.6 include synchronous rectification?

A: Yes. Both parts feature integrated synchronous rectification, which improves efficiency by reducing conduction losses compared to standard diode rectification.