LP311DRG4 Equivalent & Substitute Parts

Part Overview

The LP311DRG4 is a differential comparator IC manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device features open-collector and open-emitter outputs, making it suitable for applications requiring flexible output configurations. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent alternatives for ongoing design requirements and production needs.

Key Parameters

Parameter	Value
Type	Differential Comparator
Number of Elements	1
Output Type	Open-Collector, Open-Emitter
Voltage Supply (Single/Dual)	4.6V ~ 30V, ±1.75V ~ 15V
Input Offset Voltage (Max)	7.5mV @ ±15V
Input Bias Current (Max)	0.1µA @ ±15V
Quiescent Current (Max)	300µA
Operating Temperature	0°C ~ 70°C
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LP311DRG4 is determined by the following critical parameters:

Package Compatibility: 8-SOIC surface mount package with 0.154" width (3.90mm)
Output Configuration: Open-collector and/or open-emitter topology
Supply Voltage Range: Minimum 4.6V single supply or ±1.75V dual supply capability
Differential Input Type: Single differential comparator element
Compliance: ROHS3 compliance and MSL Level 1 rating

Two substitute parts meet these criteria with varying degrees of parameter alignment:

LP311DR (Texas Instruments): Parametric equivalent with identical electrical specifications and packaging
LT1011CS8#TRPBF (Analog Devices Inc.): Manufacturer-recommended alternative with enhanced performance characteristics and broader supply voltage range

Parameter Comparison

Parameter	LP311DRG4	LP311DR	LT1011CS8#TRPBF
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.
Type	Differential	Differential	General Purpose
Number of Elements	1	1	1
Output Type	Open-Collector, Open-Emitter	Open-Collector, Open-Emitter	Open-Collector
Voltage Supply (Single/Dual)	4.6V ~ 30V, ±1.75V ~ 15V	4.6V ~ 30V, ±1.75V ~ 15V	3V ~ 36V, ±1.5V ~ 18V
Input Offset Voltage (Max)	7.5mV @ ±15V	7.5mV @ ±15V	2mV @ ±15V
Input Bias Current (Max)	0.1µA @ ±15V	0.1µA @ ±15V	0.065µA @ ±15V
Output Current (Typ)	Not specified	Not specified	50mA
Quiescent Current (Max)	300µA	300µA	4mA
CMRR (Typ)	Not specified	Not specified	115dB
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package	8-SOIC	8-SOIC	8-SOIC
Product Status	Discontinued	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	Level 1	Level 1	Level 1

Engineering Selection Recommendations

LP311DR is the direct parametric equivalent to the LP311DRG4. Both devices share identical electrical specifications, supply voltage ranges, and package configuration. This part is currently in active production status with higher inventory availability (3198 pcs), making it the primary replacement for discontinued LP311DRG4 applications. Both parts maintain ROHS3 compliance and MSL Level 1 rating.

LT1011CS8#TRPBF represents a manufacturer-recommended alternative from Analog Devices Inc. This device offers enhanced performance characteristics including lower input offset voltage (2mV vs. 7.5mV), reduced input bias current (0.065µA vs. 0.1µA), and specified output current capability (50mA). The LT1011CS8#TRPBF supports an extended supply voltage range (3V ~ 36V single supply, ±1.5V ~ 18V dual supply) and provides 115dB CMRR specification. However, the output configuration is open-collector only, lacking the open-emitter output present in the LP311DRG4. This part is active in production with substantial inventory (3900 pcs).

Selection between LP311DR and LT1011CS8#TRPBF depends on circuit requirements for open-emitter output functionality and quiescent current constraints. Applications requiring the dual open-collector/open-emitter output topology must use LP311DR. Applications tolerant of open-collector-only output may benefit from LT1011CS8#TRPBF's superior input characteristics and lower quiescent current.

Frequently Asked Questions (FAQ)

Q: Can LP311DR be used as a direct replacement for LP311DRG4?

A: Yes. LP311DR is a parametric equivalent with identical electrical specifications, supply voltage ranges, input/output characteristics, and 8-SOIC package configuration. The primary difference is product status: LP311DRG4 is discontinued while LP311DR remains in active production.

Q: What is the key difference between LP311DR and LT1011CS8#TRPBF?

A: LP311DR maintains identical specifications to the LP311DRG4, including dual open-collector/open-emitter outputs. LT1011CS8#TRPBF offers improved input offset voltage (2mV vs. 7.5mV) and lower input bias current but provides only open-collector output. LT1011CS8#TRPBF also exhibits higher quiescent current (4mA vs. 300µA).

Q: Are all substitute parts in the same package?

A: Yes. LP311DRG4, LP311DR, and LT1011CS8#TRPBF are all housed in 8-SOIC surface mount packages with 0.154" width (3.90mm), ensuring PCB footprint compatibility.

Q: Do the substitute parts maintain RoHS and MSL compliance?

A: Yes. Both LP311DR and LT1011CS8#TRPBF are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of LP311DRG4.

Q: Which substitute should be selected for new designs?

A: LP311DR is recommended for direct replacement in existing LP311DRG4 applications. For new designs, either LP311DR or LT1011CS8#TRPBF may be selected based on specific circuit requirements for output configuration and quiescent current performance.

Q: What is the supply voltage compatibility range for substitutes?

A: LP311DR supports 4.6V ~ 30V single supply or ±1.75V ~ 15V dual supply. LT1011CS8#TRPBF supports a broader range: 3V ~ 36V single supply or ±1.5V ~ 18V dual supply. Both are compatible with standard industrial and consumer supply voltages.

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