LM1949N Equivalent & Substitute Parts

Part Overview

The LM1949N is a Power Management Integrated Circuit (PMIC) designed as an injector drive controller in 8-DIP packaging. This component operates across a 3V to 5.5V supply voltage range with a maximum supply current of 28mA, supporting automotive-grade applications across an operating temperature range of -40°C to 125°C. The LM1949N is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

LM1949N

Texas InstrumentsIn Stock: 1651LM1949N Datasheet

Current PartRFQ

LM1949N/NOPB

National SemiconductorIn Stock: 3137LM1949N/NOPB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM1949N is determined by strict alignment across the following critical parameters:

• Package / Case: 8-DIP (0.300", 7.62mm) — ensures mechanical and electrical compatibility with existing PCB layouts
• Voltage - Supply: 3V ~ 5.5V — maintains operational compatibility within the same power supply envelope
• Current - Supply: 28mA — confirms equivalent power delivery requirements
• Operating Temperature: -40°C ~ 125°C — ensures thermal performance across the same environmental range
• Grade: Automotive — maintains compliance with automotive qualification standards
• Mounting Type: Through Hole — preserves assembly compatibility

The LM1949N/NOPB, manufactured by National Semiconductor, meets all specified parameters and qualifies as a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

The LM1949N/NOPB is the qualified substitute for the obsolete LM1949N. Both components share identical electrical specifications, package geometry, and automotive-grade certification. The primary distinction is product status: the LM1949N/NOPB maintains active manufacturing status, ensuring continued availability and supply chain reliability. Both components carry identical export classification (ECCN: EAR99) and tariff codes (HTSUS: 8542.39.0001), with no compliance barriers to substitution. The LM1949N/NOPB is suitable for direct replacement in existing designs and new implementations requiring injector drive controller functionality within automotive applications.

Frequently Asked Questions (FAQ)

Q: Can the LM1949N/NOPB be used as a direct replacement for the LM1949N?

A: Yes. Both components share identical electrical parameters (3V–5.5V supply, 28mA current, -40°C to 125°C operating range), package geometry (8-DIP), mounting type (Through Hole), and automotive-grade certification. Pin-for-pin compatibility is confirmed.

Q: What is the difference between LM1949N and LM1949N/NOPB?

A: The LM1949N/NOPB is the active production variant manufactured by National Semiconductor. The "/NOPB" suffix indicates lead-free (Pb-free) compliance. The original LM1949N is obsolete. Functionally and electrically, both are equivalent.

Q: Are there any compliance or certification differences?

A: Both components carry identical export classification (EAR99) and tariff codes (8542.39.0001). No additional compliance barriers exist for substitution.

Q: Can this component be used in non-automotive applications?

A: The LM1949N and LM1949N/NOPB are automotive-grade components. While they may function in non-automotive environments within the specified operating temperature range, they are qualified and intended for automotive use.

Q: What is the moisture sensitivity level (MSL) for these components?

A: The LM1949N has an MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.