LMC555CMM Equivalent & Substitute Parts

Part Overview

The LMC555CMM is a 555 Type Timer/Oscillator (Single) IC manufactured by Texas Instruments, operating at 3MHz with a supply voltage range of 1.5V to 15V. The device is packaged in 8-VSSOP surface mount configuration and is classified as Last Time Buy, indicating discontinuation from the manufacturer. Finding equivalent and substitute parts is necessary to ensure design continuity and maintain component availability for production and maintenance applications.

Substiute Parts

LMC555CMM

Texas InstrumentsIn Stock: 10301LMC555CMM Datasheet

Current PartRFQ

LMC555CMM/NOPB

Texas InstrumentsIn Stock: 10346LMC555CMM/NOPB Datasheet

DirectRFQ

LMC555CMMX/NOPB

Texas InstrumentsIn Stock: 40220LMC555CMMX/NOPB Datasheet

Parametric EquivalentRFQ

NCV1455BDR2G

onsemiIn Stock: 55207NCV1455BDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LMC555CMM are classified based on functional equivalence within the 555 Type Timer/Oscillator category. The substitution logic is determined by the following critical parameters:

Functional Compatibility Parameters:

• Type: 555 Type, Timer/Oscillator (Single)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)

Electrical Compatibility Parameters:

• Voltage - Supply range overlap
• Current - Supply specifications
• Operating Temperature range coverage

Substitute parts are grouped into two categories:

1. Direct Manufacturer Substitutes - Parts from the same manufacturer (Texas Instruments) with identical electrical specifications and package compatibility
2. Parametric Equivalents - Parts from alternative manufacturers (onsemi) that maintain 555 Type functionality with compatible electrical and thermal characteristics, though package form factor may differ

Parameter Comparison

Engineering Selection Recommendations

LMC555CMM/NOPB - Direct substitute with identical electrical specifications and package configuration. Product status is Active, ensuring continued availability. This part is the primary recommendation for direct replacement in existing designs.

LMC555CMMX/NOPB - Parametric equivalent with identical electrical specifications and package configuration. Product status is Active with higher inventory availability (40200 Pcs). This part provides equivalent functionality with enhanced supply chain security.

NCV1455BDR2G - Alternative manufacturer substitute from onsemi. Maintains 555 Type Timer/Oscillator functionality with ROHS3 compliance and MSL 1 rating. Supply voltage range (4.5V ~ 16V) overlaps the original specification minimum at 4.5V. Operating temperature range extends to 125°C, providing enhanced thermal performance. Package form factor differs (8-SOIC vs. 8-VSSOP), requiring PCB layout modification. Current supply specification (10 mA) is higher than the original (150 µA). Product status is Active with high inventory availability (55100 Pcs).

Frequently Asked Questions (FAQ)

Q: Can LMC555CMM/NOPB be used as a direct replacement for LMC555CMM?

A: Yes. LMC555CMM/NOPB is a direct substitute with identical electrical specifications (3MHz frequency, 1.5V ~ 15V supply voltage, 150 µA supply current, -40°C ~ 85°C operating temperature) and package configuration (8-VSSOP). The primary difference is product status: LMC555CMM is Last Time Buy while LMC555CMM/NOPB is Active.

Q: What is the difference between LMC555CMMX/NOPB and LMC555CMM/NOPB?

A: Both parts are electrically and functionally identical with the same specifications and 8-VSSOP package. The difference is inventory availability and product designation. LMC555CMMX/NOPB has higher stock levels (40200 Pcs vs. 10300 Pcs).

Q: Can NCV1455BDR2G replace LMC555CMM in all applications?

A: NCV1455BDR2G maintains 555 Type Timer/Oscillator functionality and is ROHS3 compliant. However, three factors require evaluation: (1) Package form factor differs (8-SOIC vs. 8-VSSOP), requiring PCB redesign; (2) Minimum supply voltage is 4.5V versus 1.5V for the original, limiting low-voltage applications; (3) Supply current is 10 mA versus 150 µA, affecting power consumption calculations.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. LMC555CMM/NOPB, LMC555CMMX/NOPB, and NCV1455BDR2G are all ROHS3 compliant with MSL 1 (Unlimited) rating.

Q: What is the impact of the different package types?

A: LMC555CMM, LMC555CMM/NOPB, and LMC555CMMX/NOPB use 8-VSSOP packaging (0.118" width, 3.00mm). NCV1455BDR2G uses 8-SOIC packaging (0.154" width, 3.90mm). Different package footprints require PCB layout modifications and cannot be used interchangeably without redesign.

Q: Why is the supply current specification different for NCV1455BDR2G?

A: NCV1455BDR2G specifies 10 mA supply current compared to 150 µA for the Texas Instruments parts. This reflects different device characterization and operating conditions. Applications with strict power consumption requirements should account for this difference in system-level power budgeting.