LM555CM Equivalent & Substitute Parts

Part Overview

The LM555CM is a 555 Type Timer/Oscillator (Single) IC manufactured by Texas Instruments, operating at 100kHz in an 8-SOIC surface mount package. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory. Finding equivalent and substitute parts is necessary to ensure design continuity and long-term component availability for applications requiring 555 timer functionality.

Substiute Parts

LM555CM

Texas InstrumentsIn Stock: 18170LM555CM Datasheet

Current PartRFQ

LM555CM/NOPB

Texas InstrumentsIn Stock: 2079LM555CM/NOPB Datasheet

DirectRFQ

MC1455BDR2G

onsemiIn Stock: 3298MC1455BDR2G Datasheet

MFR RecommendedRFQ

MC1455DR2G

onsemiIn Stock: 25363MC1455DR2G Datasheet

MFR RecommendedRFQ

NCV1455BDR2G

onsemiIn Stock: 55207NCV1455BDR2G Datasheet

MFR RecommendedRFQ

NE555S-13

Diodes IncorporatedIn Stock: 7341NE555S-13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM555CM is determined by strict adherence to the following parameters: device type (555 Type Timer/Oscillator), package compatibility (8-SOIC form factor), voltage supply range (4.5V ~ 16V minimum), current supply capability (10 mA minimum), and regulatory compliance (ROHS3). Substitute parts must maintain functional equivalence within these electrical and mechanical constraints. Parts are grouped based on manufacturer, product status, and operating temperature range, which may extend beyond the original specification while maintaining backward compatibility.

Parameter Comparison

Engineering Selection Recommendations

LM555CM/NOPB is the direct equivalent from Texas Instruments with identical electrical specifications and Active product status, providing the most straightforward replacement path.

MC1455DR2G from onsemi matches the operating temperature range (0°C ~ 70°C) of the original LM555CM and maintains all critical electrical parameters, offering equivalent functionality with Active status.

MC1455BDR2G and NCV1455BDR2G from onsemi provide extended operating temperature ranges (-40°C ~ 85°C and -40°C ~ 125°C respectively), suitable for applications requiring broader thermal performance while maintaining electrical compatibility.

NE555S-13 from Diodes Incorporated operates at 500kHz frequency and 13 mA current supply, exceeding the original specifications. This part is suitable only for applications where higher frequency operation and increased current capacity are acceptable or beneficial.

All substitute parts maintain ROHS3 compliance and 8-SOIC package compatibility, ensuring regulatory and mechanical interchangeability.

Frequently Asked Questions (FAQ)

Q: Can LM555CM/NOPB be used as a direct replacement for LM555CM? A: Yes. LM555CM/NOPB is the direct equivalent with identical electrical specifications, package, and Active product status.

Q: What is the difference between MC1455DR2G and MC1455BDR2G? A: Both are onsemi 555 Type Timer/Oscillator ICs in 8-SOIC packages. MC1455DR2G operates at 0°C ~ 70°C, matching the original LM555CM temperature range. MC1455BDR2G extends the lower operating limit to -40°C, suitable for wider thermal applications.

Q: Is NE555S-13 compatible with LM555CM applications? A: NE555S-13 maintains the same package and voltage supply range but operates at 500kHz frequency and 13 mA current supply, both higher than the original 100kHz and 10 mA specifications. Compatibility depends on application requirements; higher frequency and current capability may be acceptable or unnecessary for specific designs.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the original LM555CM.

Q: What packaging formats are available for substitute parts? A: LM555CM/NOPB is supplied in Tube packaging. MC1455BDR2G, MC1455DR2G, NCV1455BDR2G, and NE555S-13 are supplied in Cut Tape (CT) & Digi-Reel® format. All maintain the 8-SOIC surface mount package form factor.