LM211QDRG4 Equivalent & Substitute Parts

Part Overview

The LM211QDRG4 is a general-purpose comparator IC manufactured by Texas Instruments in 8-SOIC surface-mount packaging. This part operates across a wide supply voltage range of 4.6V to 30V (single supply) or ±1.75V to ±15V (dual supply), with an input offset voltage of 3mV at ±15V and a maximum quiescent current of 6mA. The LM211QDRG4 is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM211QDRG4
Category	Linear Comparator
Type	General Purpose
Number of Elements	1
Output Type	DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Voltage - Supply, Single/Dual (±)	4.6V ~ 30V, ±1.75V ~ 15V
Voltage - Input Offset (Max)	3mV @ ±15V
Current - Input Bias (Max)	0.1µA @ ±15V
Current - Output (Typ)	50mA
Current - Quiescent (Max)	6mA
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution for the LM211QDRG4 is determined by the following critical parameters:

Primary Substitution Criteria:

Package type: 8-SOIC surface-mount form factor
Output configuration: DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL compatibility
Supply voltage range: Minimum 4.6V single supply or ±1.75V dual supply
Input offset voltage: Maximum 3mV at ±15V
Input bias current: Maximum 0.1µA at ±15V
Output current capability: Minimum 50mA typical
Quiescent current: Maximum 6mA
Operating temperature range: Minimum -40°C to 125°C coverage

Substitute Categories:

Texas Instruments Direct Equivalents – Parts with identical electrical specifications and active product status
Texas Instruments Automotive-Grade Equivalents – AEC-Q100 qualified variants with identical electrical performance
onsemi Cross-Manufacturer Equivalent – Alternative manufacturer with compatible specifications
Analog Devices Inc. Parametric Equivalents – Higher-performance alternatives with enhanced specifications

Parameter Comparison

Parameter	LM211QDRG4	LM211QDR	LM211QDREP	LM211QDRG4Q1	LM211QDRQ1	LM211DR2G	LT1011AIS8#PBF	LT1011AIS8#TRPBF	LT1011CS8#PBF	LT1011CS8#TRPBF	LT1011IS8#PBF
Manufacturer	TI	TI	TI	TI	TI	onsemi	ADI	ADI	ADI	ADI	ADI
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Supply Voltage (Single)	4.6V ~ 30V	4.6V ~ 30V	4.6V ~ 30V	4.6V ~ 30V	4.6V ~ 30V	5V ~ 30V	3V ~ 36V	3V ~ 36V	3V ~ 36V	3V ~ 36V	3V ~ 36V
Supply Voltage (Dual)	±1.75V ~ 15V	±1.75V ~ 15V	±1.75V ~ 15V	±1.75V ~ 15V	±1.75V ~ 15V	±2.5V ~ 15V	±1.5V ~ 18V	±1.5V ~ 18V	±1.5V ~ 18V	±1.5V ~ 18V	±1.5V ~ 18V
Input Offset Voltage (Max)	3mV @ ±15V	3mV @ ±15V	3mV @ ±15V	3mV @ ±15V	3mV @ ±15V	3mV @ ±15V	0.75mV @ ±15V	0.75mV @ ±15V	2mV @ ±15V	2mV @ ±15V	2mV @ ±15V
Input Bias Current (Max)	0.1µA @ ±15V	0.1µA @ ±15V	0.1µA @ ±15V	0.1µA @ ±15V	0.1µA @ ±15V	0.1µA @ ±15V	0.035µA @ ±15V	0.035µA @ ±15V	0.065µA @ ±15V	0.065µA @ ±15V	0.065µA @ ±15V
Output Current (Typ)	50mA	50mA	50mA	50mA	50mA	—	50mA	50mA	50mA	50mA	50mA
Quiescent Current (Max)	6mA	6mA	6mA	6mA	6mA	6mA	4mA	4mA	4mA	4mA	4mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-25°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C
Output Type	DTL, MOS, OC, OE, RTL, TTL	DTL, MOS, OC, OE, RTL, TTL	DTL, MOS, OC, OE, RTL, TTL	DTL, MOS, OC, OE, RTL, TTL	DTL, MOS, OC, OE, RTL, TTL	DTL, MOS, OC, OE, RTL, TTL	Open-Collector	Open-Collector	Open-Collector	Open-Collector	Open-Collector
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	No	No	No	Yes (AEC-Q100)	Yes (AEC-Q100)	No	No	No	No	No	No

Engineering Selection Recommendations

Tier 1 – Direct Replacement (Recommended for Standard Applications)

LM211QDR and LM211QDREP are the primary substitutes for the discontinued LM211QDRG4. Both are manufactured by Texas Instruments with identical electrical specifications and active product status. These parts maintain full compatibility with existing designs and are available in higher inventory quantities (17,100 and 15,622 units respectively). Both are ROHS3 compliant with MSL 1 rating.

Tier 2 – Automotive-Grade Alternatives (For Automotive and High-Reliability Applications)

LM211QDRG4Q1 and LM211QDRQ1 are AEC-Q100 qualified variants from Texas Instruments with identical electrical performance to the original part. These are suitable for automotive applications requiring qualification documentation. Operating temperature range remains -40°C to 125°C. Inventory availability is 7,900 and 20,100 units respectively.

Tier 3 – Cross-Manufacturer Equivalent (For Supply Chain Diversification)

LM211DR2G from onsemi provides a compatible alternative with the same 8-SOIC package and general-purpose comparator functionality. This part has a narrower single-supply voltage range (5V ~ 30V versus 4.6V ~ 30V) and a reduced operating temperature range (-25°C ~ 85°C versus -40°C ~ 125°C). Use this substitute only when the narrower specifications are acceptable for the application.

Tier 4 – Enhanced Performance Alternatives (For Precision Applications)

The LT1011 series from Analog Devices Inc. offers superior electrical performance with lower input offset voltage (0.75mV to 2mV) and input bias current (0.035µA to 0.065µA) compared to the LM211QDRG4 (3mV and 0.1µA respectively). These parts feature higher CMRR (115dB typical) and are available in multiple packaging and temperature variants. However, the LT1011 series has a narrower output type specification (Open-Collector only) and may require circuit redesign. Operating temperature ranges vary by variant (0°C ~ 70°C to -40°C ~ 85°C).

Frequently Asked Questions (FAQ)

Q: Can I use LM211QDR as a direct drop-in replacement for LM211QDRG4?

A: Yes. LM211QDR is electrically identical to LM211QDRG4 with the same supply voltage range (4.6V ~ 30V single, ±1.75V ~ 15V dual), input offset voltage (3mV @ ±15V), input bias current (0.1µA @ ±15V), output current (50mA typical), quiescent current (6mA maximum), and operating temperature range (-40°C ~ 125°C). Both use 8-SOIC packaging. The primary difference is product status: LM211QDRG4 is discontinued while LM211QDR is active.

Q: What is the difference between LM211QDRG4Q1 and LM211QDRQ1?

A: Both are AEC-Q100 qualified automotive-grade variants of the LM211 comparator with identical electrical specifications. The primary difference is packaging: LM211QDRG4Q1 is supplied in Cut Tape (CT) & Digi-Reel format with 7,900 units in stock, while LM211QDRQ1 is supplied in Tape & Reel (TR) format with 20,100 units in stock. Select based on your assembly process requirements.

Q: Can I substitute LM211DR2G from onsemi for the LM211QDRG4?

A: LM211DR2G is compatible for most applications but has two specification limitations. The single-supply voltage range is narrower (5V ~ 30V versus 4.6V ~ 30V), and the operating temperature range is reduced (-25°C ~ 85°C versus -40°C ~ 125°C). Use this substitute only if your application operates within these narrower ranges.

Q: Why would I choose an LT1011 series part over the LM211 equivalents?

A: The LT1011 series offers superior precision with lower input offset voltage (0.75mV to 2mV) and lower input bias current (0.035µA to 0.065µA), plus higher CMRR (115dB typical). However, the LT1011 is limited to Open-Collector output configuration, whereas the LM211 supports multiple output types (DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL). Choose LT1011 only if your circuit requires precision performance and can accommodate Open-Collector output.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts—LM211QDR, LM211QDREP, LM211QDRG4Q1, LM211QDRQ1, LM211DR2G, and all LT1011 variants—are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the difference between tube and tape & reel packaging for the LT1011 series?

A: Tube packaging (LT1011AIS8#PBF, LT1011CS8#PBF, LT1011IS8#PBF) is suitable for manual assembly or low-volume production. Tape & Reel packaging (LT1011AIS8#TRPBF, LT1011CS8#TRPBF) is designed for automated pick-and-place assembly. Select based on your manufacturing process. Electrical specifications are identical between tube and tape & reel variants of the same part number.

Q: Which substitute should I use for a new design?

A: For new designs, use LM211QDR or LM211QDREP from Texas Instruments. Both are active products with identical specifications to the discontinued LM211QDRG4, ensuring long-term availability and design continuity. For automotive applications, use LM211QDRQ1 (AEC-Q100 qualified). For precision-critical applications, evaluate the LT1011 series, but verify that Open-Collector output compatibility meets your circuit requirements.

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