LM6511IM Equivalent & Substitute Parts

Part Overview

The LM6511IM is a general-purpose comparator manufactured by Texas Instruments, featuring CMOS, open-collector, and TTL output types in an 8-SOIC surface-mount package. The device operates across a wide supply voltage range of 2.5V to 30V and is specified for industrial temperature applications from -40°C to 85°C. Currently classified as Last Time Buy, alternative equivalent parts are necessary for new designs and long-term availability assurance.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM6511IM
Manufacturer	Texas Instruments
Category	Linear Comparator
Package / Case	8-SOIC (0.154", 3.90mm Width)
Type	General Purpose
Number of Elements	1
Output Type	CMOS, Open-Collector, TTL
Voltage - Supply, Single/Dual (±)	2.5V ~ 30V
Voltage - Input Offset (Max)	5mV @ 2.7V
Current - Input Bias (Max)	0.13µA @ 2.7V
Current - Quiescent (Max)	4.6mA
CMRR, PSRR (Typ)	72dB CMRR
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution eligibility for the LM6511IM is determined by the following critical parameters:

Primary Substitution Criteria:

Output type compatibility (CMOS, open-collector, or TTL)
Supply voltage range overlap (minimum 2.5V operation required)
Input offset voltage specification (5mV or lower preferred)
Input bias current specification (0.13µA or lower preferred)
Package form factor and pin compatibility
Operating temperature range (-40°C minimum required)
RoHS3 compliance status

Substitution Categories:

Direct Equivalent (Pin-Compatible, Same Package): LM6511IM/NOPB maintains identical electrical specifications and 8-SOIC packaging, differing only in product status (Active vs. Last Time Buy) and REACH classification.

Functional Equivalent (Different Package, Electrical Compatibility): TS391IQ2T, LMV331SE-7, and TL331SN4T3G provide comparable general-purpose comparator functionality with electrical parameters within acceptable ranges for most applications. These parts differ in package form factor, which requires PCB layout modification.

Parameter Comparison

Parameter	LM6511IM	LM6511IM/NOPB	TS391IQ2T	LMV331SE-7	TL331SN4T3G
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics	Diodes Incorporated	onsemi
Package / Case	8-SOIC	8-SOIC	8-DFN (2x2)	5-TSSOP, SOT-353	SOT-23-5, TSOT-23-5
Output Type	CMOS, Open-Collector, TTL	CMOS, Open-Collector, TTL	CMOS, DTL, ECL, Open-Collector, TTL	Open-Collector	Not Specified
Voltage - Supply (Min-Max)	2.5V ~ 30V	2.5V ~ 30V	2V ~ 36V, ±1V ~ 18V	2.7V ~ 5.5V	2V ~ 36V, ±1V ~ 18V
Voltage - Input Offset (Max)	5mV @ 2.7V	5mV @ 2.7V	1mV @ 5V	7mV @ 5V	5mV @ 5V
Current - Input Bias (Max)	0.13µA @ 2.7V	0.13µA @ 2.7V	0.25µA @ 5V	0.25µA @ 5V	0.25µA @ 5V
Current - Quiescent (Max)	4.6mA	4.6mA	500µA	120µA	1.25mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Active	Not For New Designs
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (No PCB Modification): LM6511IM/NOPB is the primary equivalent, maintaining identical electrical specifications, 8-SOIC packaging, and RoHS3 compliance. This part is currently Active and suitable for new designs, addressing the Last Time Buy status of the original LM6511IM.

For Functional Substitution (PCB Layout Modification Required):

TS391IQ2T (STMicroelectronics) offers the broadest electrical compatibility with extended supply voltage range (2V ~ 36V), superior input offset voltage (1mV @ 5V), and Active product status. The 8-DFN (2x2) package requires PCB redesign but provides equivalent functionality with lower quiescent current (500µA).

LMV331SE-7 (Diodes Incorporated) provides open-collector output compatibility and extended operating temperature range (-40°C ~ 125°C). The 5-TSSOP package is significantly smaller than 8-SOIC, suitable for space-constrained applications. Supply voltage range is limited to 2.7V ~ 5.5V, restricting use in high-voltage applications. MSL rating of 3 requires controlled moisture exposure during assembly.

TL331SN4T3G (onsemi) supports the full supply voltage range (2V ~ 36V, ±1V ~ 18V) and maintains MSL 1 rating. Product status is Not For New Designs, limiting suitability for new development. The SOT-23-5 package is the smallest option available.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and EAR99 ECCN classification. REACH status varies: LM6511IM/NOPB is REACH Unaffected, while TS391IQ2T, LMV331SE-7, and TL331SN4T3G are REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can LM6511IM/NOPB be used as a direct drop-in replacement for LM6511IM?

A: Yes. LM6511IM/NOPB is electrically and mechanically identical to LM6511IM, with the same 8-SOIC package, electrical specifications, and operating parameters. The primary difference is product status (Active vs. Last Time Buy) and REACH classification. No PCB modifications are required.

Q: What are the key differences between the LM6511IM and TS391IQ2T?

A: Both are general-purpose comparators with compatible output types and supply voltage ranges. TS391IQ2T offers superior input offset voltage (1mV vs. 5mV) and lower quiescent current (500µA vs. 4.6mA). The package differs: TS391IQ2T uses 8-DFN (2x2) instead of 8-SOIC, requiring PCB layout modification. TS391IQ2T supports extended temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C).

Q: Is LMV331SE-7 suitable for high-voltage applications?

A: No. LMV331SE-7 operates within 2.7V ~ 5.5V supply range, making it unsuitable for applications requiring operation above 5.5V. The LM6511IM supports 2.5V ~ 30V, providing significantly broader voltage compatibility. LMV331SE-7 is appropriate only for low-voltage, single-supply designs.

Q: What packaging considerations apply when substituting with alternative parts?

A: LM6511IM/NOPB maintains the original 8-SOIC package and requires no PCB changes. TS391IQ2T (8-DFN 2x2), LMV331SE-7 (5-TSSOP), and TL331SN4T3G (SOT-23-5) all require PCB layout redesign due to different pin counts, spacing, and footprints. Verify pinout compatibility and thermal requirements before implementation.

Q: Why is TL331SN4T3G marked as Not For New Designs?

A: TL331SN4T3G carries a Not For New Designs product status, indicating onsemi has designated this part for legacy support only. New designs should prioritize Active-status alternatives such as TS391IQ2T or LM6511IM/NOPB to ensure long-term availability and manufacturer support.

Q: What is the impact of MSL rating differences?

A: LM6511IM, LM6511IM/NOPB, TS391IQ2T, and TL331SN4T3G carry MSL 1 (Unlimited), allowing indefinite storage without moisture control. LMV331SE-7 carries MSL 3 (168 Hours), requiring controlled moisture exposure during assembly. MSL 3 components must be baked before reflow soldering if storage exceeds 168 hours at specified humidity levels.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. LM6511IM, LM6511IM/NOPB, TS391IQ2T, LMV331SE-7, and TL331SN4T3G are all ROHS3 Compliant, meeting lead-free and restricted substance requirements for EU and global markets.

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