LM311NG Equivalent & Substitute Parts

Part Overview

The LM311NG is a general-purpose voltage comparator manufactured by onsemi in 8-DIP through-hole packaging. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The LM311 series provides DTL, MOS, open-collector, open-emitter, RTL, and TTL output configurations suitable for analog signal comparison applications across industrial and commercial temperature ranges.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM311NG
Manufacturer	onsemi
Category	Linear
Type	General Purpose Comparator
Number of Elements	1
Output Type	DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL
Voltage - Supply, Single/Dual (±)	5V ~ 30V, ±2.5V ~ 15V
Voltage - Input Offset (Max)	7.5mV @ ±15V
Current - Input Bias (Max)	0.25µA @ ±15V
Current - Quiescent (Max)	7.5mA
Operating Temperature	0°C ~ 70°C
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LM311NG is determined by the following critical parameters:

Functional equivalence: Single-element general-purpose comparator with identical output type configuration (DTL, MOS, open-collector, open-emitter, RTL, TTL)
Electrical compatibility: Matching supply voltage range (5V ~ 30V, ±2.5V ~ 15V), input offset voltage (7.5mV @ ±15V), input bias current (0.25µA @ ±15V), and quiescent current (7.5mA)
Operating temperature range: 0°C ~ 70°C
Package compatibility: 8-DIP through-hole form factor for direct pin-compatible replacement, or 8-SOIC surface-mount variant for redesigned layouts

Substitutes are classified into two categories:

Direct Manufacturer Substitute (LM311DR2G): onsemi product with identical electrical specifications but different package (8-SOIC surface-mount)
Similar Manufacturer Substitute (LM311N/NOPB): Texas Instruments product with identical package (8-DIP through-hole) and compatible electrical specifications

Parameter Comparison

Parameter	LM311NG (Main)	LM311DR2G (Direct Substitute)	LM311N/NOPB (Similar Substitute)
Manufacturer	onsemi	onsemi	Texas Instruments
Type	General Purpose	General Purpose	General Purpose
Number of Elements	1	1	1
Output Type	DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL	DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL	DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL
Voltage - Supply, Single/Dual (±)	5V ~ 30V, ±2.5V ~ 15V	5V ~ 30V, ±2.5V ~ 15V	5V ~ 36V, ±2.5V ~ 18V
Voltage - Input Offset (Max)	7.5mV @ ±15V	7.5mV @ ±15V	7.5mV @ ±15V
Current - Input Bias (Max)	0.25µA @ ±15V	0.25µA @ ±15V	0.25µA @ ±15V
Current - Quiescent (Max)	7.5mA	7.5mA	7.5mA
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	8-DIP (0.300", 7.62mm)	8-SOIC (0.154", 3.90mm Width)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Surface Mount	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For direct pin-compatible replacement in existing through-hole designs:

Select LM311N/NOPB (Texas Instruments). This part maintains the 8-DIP through-hole package, identical electrical specifications, and active product status. The extended supply voltage range (5V ~ 36V vs. 5V ~ 30V) and higher output current capability (50mA typical) provide additional design margin. ROHS3 compliance ensures regulatory alignment for new production.

For surface-mount redesigns or new layouts:

Select LM311DR2G (onsemi). This part provides identical electrical specifications to the original LM311NG with active product status and ROHS3 compliance. The 8-SOIC package reduces board space and enables automated assembly processes. Sourcing from the original manufacturer (onsemi) maintains design continuity.

Product status consideration:

Both substitute parts are active products with established supply chains, eliminating the obsolescence risk associated with the LM311NG.

Frequently Asked Questions (FAQ)

Q: Can LM311DR2G replace LM311NG in existing PCB designs?

A: LM311DR2G is not a direct pin-compatible replacement. The LM311NG uses 8-DIP through-hole packaging while LM311DR2G uses 8-SOIC surface-mount packaging. PCB layout redesign is required. For direct replacement without layout changes, use LM311N/NOPB.

Q: What are the key electrical differences between LM311N/NOPB and LM311NG?

A: The LM311N/NOPB has an extended supply voltage range (5V ~ 36V vs. 5V ~ 30V for single supply, and ±2.5V ~ 18V vs. ±2.5V ~ 15V for dual supply) and specified output current of 50mA typical. All other critical parameters—input offset voltage, input bias current, quiescent current, and operating temperature—are identical.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both LM311DR2G and LM311N/NOPB are ROHS3 compliant. The original LM311NG does not specify RoHS status.

Q: Which substitute part has better availability?

A: LM311DR2G has significantly higher inventory (516,900 pcs) compared to LM311N/NOPB (5,310 pcs), making it the preferred choice for high-volume production when package compatibility permits redesign.

Q: Can I use LM311N/NOPB as a drop-in replacement for LM311NG?

A: Yes. LM311N/NOPB is pin-compatible with LM311NG in 8-DIP through-hole packaging. No PCB modifications are required. Electrical specifications are compatible for all standard applications within the 0°C ~ 70°C operating temperature range.

Q: What is the base product number for all three parts?

A: All three parts—LM311NG, LM311DR2G, and LM311N/NOPB—share the base product number LM311, indicating they are variants of the same comparator family with different packaging and manufacturers.

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