LMC555IM/NOPB Equivalent & Substitute Parts

Part Overview

The LMC555IM/NOPB is a 555 Type Timer/Oscillator (Single) IC manufactured by Texas Instruments, operating at 3MHz with 8-SOIC surface mount packaging. This part is currently in Last Time Buy status, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 555-type timer functionality.

Key Parameters

Parameter	Value
Manufacturer Part Number	LMC555IM/NOPB
Manufacturer	Texas Instruments
Product Type	555 Type, Timer/Oscillator (Single)
Frequency	3MHz
Voltage Supply Range	1.5V ~ 15V
Supply Current	150 µA
Operating Temperature Range	-40°C ~ 125°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution compatibility for the LMC555IM/NOPB is determined by the following critical parameters:

Package Compatibility: All substitute parts must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging to ensure PCB footprint compatibility.

Functional Type: All parts must be 555 Type Timer/Oscillator (Single) ICs to maintain functional equivalence.

Electrical Parameters: Substitute parts must operate within overlapping voltage supply ranges and support the required frequency range for the application. The LMC555IM/NOPB operates at 3MHz; substitute parts with lower maximum frequencies (1MHz, 2.5MHz, 500kHz) are suitable for applications not requiring the full 3MHz capability.

Temperature Range: Operating temperature ranges must encompass the application's thermal requirements. The LMC555IM/NOPB supports -40°C ~ 125°C; substitutes with narrower ranges are acceptable if the application operates within those limits.

Supply Current: Lower supply current in substitute parts indicates improved power efficiency and is generally advantageous.

Parameter Comparison

Part Number	Manufacturer	Frequency	Voltage Supply	Supply Current	Operating Temp	Packaging	Product Status
LMC555IM/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 125°C	Tube	Last Time Buy
LMC555IMX/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 125°C	Cut Tape (CT) & Digi-Reel®	Active
ALD7555SAL	Advanced Linear Devices Inc.	2.5MHz	2V ~ 10V	50 µA	0°C ~ 70°C	Tube	Active
ICM7555CBAZ	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	0°C ~ 70°C	Tube	Active
ICM7555CBAZ-T	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	0°C ~ 70°C	Cut Tape (CT) & Digi-Reel®	Active
ICM7555ESA+	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-40°C ~ 85°C	Tube	Active
ICM7555ESA+T	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	Active
ICM7555IBAZ	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	-25°C ~ 85°C	Tube	Active
ICM7555IBAZ-T	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	-25°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	Active
ICM7555ISA+	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-20°C ~ 85°C	Tube	Active
ICM7555ISA+T	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-20°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	Active

Engineering Selection Recommendations

Primary Recommendation: LMC555IMX/NOPB is the direct equivalent to LMC555IM/NOPB, manufactured by Texas Instruments with identical electrical specifications. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tube). This part maintains Active product status and is the preferred choice for design continuity.

Secondary Recommendations by Application Requirements:

For applications requiring extended temperature range (-40°C operation) with lower power consumption, ICM7555ESA+ or ICM7555ESA+T (500kHz) are suitable if frequency requirements do not exceed 500kHz. These parts offer 30 µA supply current versus 150 µA of the original part.

For applications operating within 0°C ~ 70°C temperature range with frequency requirements up to 2.5MHz, ALD7555SAL provides the lowest supply current (50 µA) among mid-frequency alternatives.

For applications requiring 1MHz operation with extended temperature range (-25°C ~ 85°C), ICM7555IBAZ or ICM7555IBAZ-T offer broader voltage supply compatibility (2V ~ 18V) compared to the original part's 1.5V minimum.

All substitute parts are ROHS3 Compliant and REACH Unaffected, maintaining regulatory compliance equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can I use ICM7555CBAZ-T as a direct replacement for LMC555IM/NOPB?

A: ICM7555CBAZ-T is functionally compatible as a 555-type timer in 8-SOIC packaging. However, it operates at 1MHz maximum frequency versus 3MHz for the original part. Use this substitute only if your application does not require frequencies above 1MHz. The operating temperature range is narrower (0°C ~ 70°C versus -40°C ~ 125°C).

Q: What is the difference between tube and cut tape packaging?

A: Tube packaging contains loose components in a plastic tube, suitable for manual assembly or lower-volume production. Cut Tape & Digi-Reel® packaging provides components on continuous tape with carrier, optimized for automated pick-and-place assembly. Both formats contain identical die and electrical specifications; the choice depends on assembly process requirements.

Q: Why does ALD7555SAL have lower supply current than the original part?

A: ALD7555SAL is designed with lower power consumption (50 µA versus 150 µA), making it suitable for battery-powered or power-constrained applications. This is an inherent design characteristic of the Advanced Linear Devices implementation and does not affect functional compatibility for standard 555-type timer applications.

Q: Can I substitute a 500kHz part for a 3MHz application?

A: No. The maximum frequency rating indicates the highest frequency at which the oscillator can operate reliably. Using a 500kHz part in a 3MHz application will result in functional failure. Select substitute parts with maximum frequency ratings equal to or greater than your application requirement.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 Compliant and REACH Unaffected, maintaining environmental and regulatory compliance equivalent to the original LMC555IM/NOPB.

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