LM211DG Equivalent & Substitute Parts

Part Overview

The LM211DG is a general-purpose comparator IC manufactured by onsemi in 8-SOIC surface-mount packaging. This device is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement. The LM211DG operates across a wide supply voltage range (5V ~ 30V single supply, ±2.5V ~ 15V dual supply) and is suitable for DTL, MOS, open-collector, open-emitter, RTL, and TTL output configurations. Locating active alternatives ensures design continuity and supply chain reliability.

Key Parameters

Parameter	LM211DG Value
Manufacturer	onsemi
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Type	General Purpose
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)	3mV @ ±15V
Current - Input Bias (Max)	0.1µA @ ±15V
Current - Quiescent (Max)	6mA
Operating Temperature	-40°C ~ 85°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LM211DG is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Package type: 8-SOIC surface-mount form factor
Output configuration: DTL, MOS, open-collector, open-emitter, RTL, TTL compatibility
Input offset voltage: 3mV @ ±15V
Input bias current: 0.1µA @ ±15V
Quiescent current: 6mA maximum
Moisture sensitivity: MSL 1 (Unlimited)

Acceptable Variation Parameters:

Supply voltage range: Substitute parts may support extended ranges (e.g., 4.6V ~ 30V) provided the LM211DG operating range (5V ~ 30V, ±2.5V ~ 15V) is fully contained within the substitute's range
Operating temperature: Substitute parts may support extended temperature ranges beyond -40°C ~ 85°C
Product status: Active or discontinued alternatives are acceptable; obsolete status does not disqualify a substitute if electrical parameters align

Substitute parts are grouped by manufacturer and product status to facilitate procurement decisions based on availability and supply chain continuity.

Parameter Comparison

Part Number	Manufacturer	Product Status	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Quiescent Current (Max)	Operating Temperature	Output Current (Typ)	Packaging
LM211DG	onsemi	Obsolete	5V ~ 30V, ±2.5V ~ 15V	3mV @ ±15V	0.1µA @ ±15V	6mA	-40°C ~ 85°C	—	8-SOIC
LM211DR2G	onsemi	Active	5V ~ 30V, ±2.5V ~ 15V	3mV @ ±15V	0.1µA @ ±15V	6mA	-25°C ~ 85°C	—	8-SOIC
LM211DR	Texas Instruments	Active	4.6V ~ 30V, ±1.75V ~ 15V	3mV @ ±15V	0.1µA @ ±15V	6mA	-40°C ~ 85°C	50mA	8-SOIC
LM211D	STMicroelectronics	Active	5V ~ 30V, ±2.5V ~ 15V	3mV @ ±15V	0.1µA @ ±15V	6mA	-40°C ~ 105°C	50mA	8-SOIC
LM211DE4	Texas Instruments	Obsolete	4.6V ~ 30V, ±1.75V ~ 15V	3mV @ ±15V	0.1µA @ ±15V	6mA	-40°C ~ 85°C	50mA	8-SOIC
LM211DRG4	Texas Instruments	Discontinued at DiGi Electronics	4.6V ~ 30V, ±1.75V ~ 15V	3mV @ ±15V	0.1µA @ ±15V	6mA	-40°C ~ 85°C	50mA	8-SOIC
LM211DT	STMicroelectronics	Active	5V ~ 30V, ±2.5V ~ 15V	3mV @ ±15V	0.1µA @ ±15V	6mA	-40°C ~ 105°C	50mA	8-SOIC
LM211MDREP	Texas Instruments	Active	4.6V ~ 30V, ±1.75V ~ 15V	3mV @ ±15V	0.1µA @ ±15V	6mA	-55°C ~ 125°C	50mA	8-SOIC
LM211QD	Texas Instruments	Active	4.6V ~ 30V, ±1.75V ~ 15V	3mV @ ±15V	0.1µA @ ±15V	6mA	-40°C ~ 125°C	50mA	8-SOIC
LM211QDG4	Texas Instruments	Last Time Buy	4.6V ~ 30V, ±1.75V ~ 15V	3mV @ ±15V	0.1µA @ ±15V	6mA	-40°C ~ 125°C	50mA	8-SOIC

Engineering Selection Recommendations

Primary Recommendation: LM211DR2G (onsemi)

The LM211DR2G is the direct active equivalent from the original manufacturer. It maintains identical electrical specifications to the LM211DG with matching supply voltage range (5V ~ 30V, ±2.5V ~ 15V) and operating temperature overlap (-25°C ~ 85°C). This part is currently active with 16,117 units in stock, ensuring supply continuity. RoHS3 compliance and REACH unaffected status align with modern regulatory requirements.

Secondary Recommendation: LM211D (STMicroelectronics)

The LM211D from STMicroelectronics is an active alternative with identical electrical parameters and matching supply voltage specifications. It offers an extended operating temperature range (-40°C ~ 105°C) and provides 50mA typical output current. With 18,751 units in stock and RoHS3 compliance, this part supports long-term availability. Available in both tube and cut-tape packaging options.

Alternative Recommendation: LM211DT (STMicroelectronics)

The LM211DT provides the same electrical performance as LM211D with cut-tape packaging and 46,488 units in stock. This variant is suitable for automated assembly processes and offers the same extended temperature range and RoHS3 compliance.

Extended Temperature Option: LM211MDREP (Texas Instruments)

For applications requiring extended temperature operation (-55°C ~ 125°C), the LM211MDREP is an active alternative with 8,231 units in stock. This part supports the LM211DG supply voltage range through extended specifications (4.6V ~ 30V, ±1.75V ~ 15V) and includes RoHS3 compliance.

Extended Temperature and Range Option: LM211QD (Texas Instruments)

The LM211QD offers the widest operating temperature range (-40°C ~ 125°C) and extended supply voltage specifications (4.6V ~ 30V, ±1.75V ~ 15V). With 1,204 units in stock and active status, this part is suitable for demanding thermal environments while maintaining full electrical compatibility.

Parts with obsolete or discontinued status (LM211DE4, LM211DRG4, LM211QDG4) should be avoided for new designs despite parameter compatibility, as supply continuity cannot be assured.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM211DG with LM211DR2G in my existing design?

A: Yes. The LM211DR2G is the active equivalent from onsemi with identical electrical specifications and matching supply voltage range. No circuit modifications are required. The primary difference is operating temperature range: LM211DR2G operates from -25°C to 85°C versus LM211DG's -40°C to 85°C. Verify your application's minimum operating temperature requirement.

Q: What is the difference between LM211D and LM211DT?

A: Both are STMicroelectronics parts with identical electrical specifications. LM211D is supplied in tube packaging, while LM211DT is supplied in cut-tape packaging. Select based on your assembly process requirements. LM211DT is preferred for automated pick-and-place assembly.

Q: Why do some substitutes have different supply voltage ranges?

A: Texas Instruments variants (LM211DR, LM211MDREP, LM211QD, LM211QDG4) specify 4.6V ~ 30V single supply and ±1.75V ~ 15V dual supply, which encompasses the LM211DG range of 5V ~ 30V and ±2.5V ~ 15V. These extended ranges provide additional design flexibility while maintaining full compatibility with the original specification.

Q: Are all substitute parts RoHS3 compliant?

A: All active and recently discontinued substitute parts listed carry RoHS3 compliance. The original LM211DG does not specify RoHS status. Verify compliance requirements for your application and procurement standards.

Q: Which substitute offers the best long-term availability?

A: LM211DT (STMicroelectronics) has the highest inventory at 46,488 units in stock and active product status. LM211DR2G (onsemi) with 16,117 units is the direct manufacturer equivalent. Both ensure supply continuity for new designs.

Q: Can I use LM211QD for applications requiring -55°C operation?

A: Yes. LM211QD operates from -40°C to 125°C, covering the -55°C requirement. However, if your application requires operation below -40°C, LM211MDREP (-55°C ~ 125°C) is the appropriate choice.

Q: What is the significance of "Last Time Buy" status for LM211QDG4?

A: Last Time Buy indicates Texas Instruments will accept orders only until a specified cutoff date, after which the part becomes unavailable. Avoid this part for new designs. Use LM211QD (active status) instead for equivalent performance.

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