MCP6546T-I/MS Equivalent & Substitute Parts

Part Overview

The MCP6546T-I/MS is a general-purpose CMOS comparator manufactured by Microchip Technology, featuring open-drain, rail-to-rail output with TTL compatibility in an 8-MSOP surface mount package. The device is actively produced and RoHS3 compliant. Substitute parts are identified to address packaging preferences, inventory availability, or specific application requirements while maintaining electrical compatibility within defined parameter ranges.

Key Parameters

Parameter	Value
Voltage Supply Range (Single/Dual)	1.6V ~ 5.5V
Input Offset Voltage (Max)	7mV @ 5.5V
Input Bias Current (Max)	1pA @ 5.5V
Output Current (Typ)	30mA
Quiescent Current (Max)	1µA
CMRR / PSRR (Typ)	70dB CMRR, 80dB PSRR
Propagation Delay (Max)	8µs
Hysteresis	6.5mV
Operating Temperature	-40°C ~ 85°C
Package	8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
Output Type	CMOS, Open-Drain, Rail-to-Rail, TTL

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on substitution type:

Direct Manufacturer Substitutes (Same Base Product, Different Packaging)

MCP6546-I/MS: Identical electrical specifications and 8-MSOP package, differentiated by tube packaging instead of tape & reel and RoHS non-compliance status.

Parametric Equivalents (Same Manufacturer, Enhanced Performance)

MCP6548T-I/MS: Shares identical electrical parameters, package, and RoHS3 compliance. Substitution is based on equivalent performance within the same product family.

Cross-Manufacturer Alternatives (Different Manufacturer, Package Variation)

LMV7275MGX/NOPB and LMV7275MF/NOPB: Texas Instruments equivalents with improved propagation delay (2.1µs vs. 8µs) and lower input bias current (0.01µA vs. 1pA). These parts use different packages (SC-70-5 and SOT-23-5 respectively) and require PCB layout redesign.

Substitution eligibility is determined by: output type compatibility, supply voltage range overlap, operating temperature range match, and package/pinout compatibility.

Parameter Comparison

Parameter	MCP6546T-I/MS	MCP6546-I/MS	MCP6548T-I/MS	LMV7275MGX/NOPB	LMV7275MF/NOPB
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Texas Instruments	Texas Instruments
Voltage Supply Range	1.6V ~ 5.5V	1.6V ~ 5.5V	1.6V ~ 5.5V	1.8V ~ 5.5V, ±0.9V ~ 2.75V	1.8V ~ 5.5V, ±0.9V ~ 2.75V
Input Offset Voltage (Max)	7mV @ 5.5V	7mV @ 5.5V	7mV @ 5.5V	4mV @ 5V	4mV @ 5V
Input Bias Current (Max)	1pA @ 5.5V	1pA @ 5.5V	1pA @ 5.5V	0.01µA @ 5V	0.01µA @ 5V
Quiescent Current (Max)	1µA	1µA	1µA	14µA	14µA
Propagation Delay (Max)	8µs	8µs	8µs	2.1µs	2.1µs
CMRR / PSRR (Typ)	70dB CMRR, 80dB PSRR	70dB CMRR, 80dB PSRR	70dB CMRR, 80dB PSRR	78dB CMRR, 80dB PSRR	78dB CMRR, 80dB PSRR
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-MSOP	8-MSOP	8-MSOP	SC-70-5	SOT-23-5
Output Type	CMOS, Open-Drain, Rail-to-Rail, TTL	CMOS, Open-Drain, Rail-to-Rail, TTL	CMOS, Open-Drain, Rail-to-Rail, TTL	CMOS, Open-Drain, Rail-to-Rail	CMOS, Open-Drain, Rail-to-Rail
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Tape & Reel (TR)	Tube	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

For Direct Replacement (Same Package, Same Manufacturer) Select MCP6546-I/MS or MCP6548T-I/MS when PCB layout and pinout compatibility are required. MCP6548T-I/MS is preferred due to RoHS3 compliance and higher inventory availability (3359 pcs vs. 748 pcs for MCP6546T-I/MS). MCP6546-I/MS is suitable only when RoHS non-compliance is acceptable and tube packaging meets assembly requirements.

For Performance Enhancement with Package Change Select LMV7275MGX/NOPB (SC-70-5 package) or LMV7275MF/NOPB (SOT-23-5 package) when improved propagation delay (2.1µs vs. 8µs) and lower input bias current (0.01µA vs. 1pA) are required. These substitutions require PCB redesign due to different pinout and package footprint. Both are RoHS3 compliant with high inventory availability (26229 pcs and 6948 pcs respectively).

Compliance Considerations All recommended substitutes except MCP6546-I/MS maintain RoHS3 compliance. For applications requiring RoHS compliance, exclude MCP6546-I/MS. All parts are REACH unaffected and classified as EAR99.

Frequently Asked Questions (FAQ)

Q: Can MCP6546-I/MS be used as a direct replacement for MCP6546T-I/MS? A: Yes, electrically identical. The difference is packaging format (tube vs. tape & reel) and RoHS compliance status. MCP6546-I/MS is RoHS non-compliant, which may restrict use in regulated applications.

Q: What is the key difference between MCP6548T-I/MS and MCP6546T-I/MS? A: Electrical specifications are identical. Both use 8-MSOP packaging and are RoHS3 compliant. MCP6548T-I/MS has higher inventory availability and represents the same product family with equivalent performance.

Q: Can LMV7275 series parts replace MCP6546T-I/MS without circuit modification? A: No. LMV7275MGX/NOPB and LMV7275MF/NOPB use different packages (SC-70-5 and SOT-23-5 respectively) with different pinouts. PCB layout redesign is required. However, electrical performance is superior with faster propagation delay and lower input bias current.

Q: What is the minimum supply voltage for each substitute? A: MCP6546T-I/MS, MCP6546-I/MS, and MCP6548T-I/MS support 1.6V minimum. LMV7275MGX/NOPB and LMV7275MF/NOPB support 1.8V minimum (or ±0.9V for dual supply). Applications requiring 1.6V operation must use Microchip parts.

Q: Are all substitutes suitable for -40°C to 85°C operating range? A: Yes, all listed substitutes support the full -40°C to 85°C operating temperature range.

Q: Which substitute has the best availability? A: LMV7275MGX/NOPB has the highest inventory (26229 pcs), followed by LMV7275MF/NOPB (6948 pcs) and MCP6548T-I/MS (3359 pcs).

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