LM555H/883 Equivalent & Substitute Parts

Part Overview

The LM555H/883 is a 555 Type Timer/Oscillator (Single) IC manufactured by Texas Instruments, designed for clock and timing applications. This device operates across a wide temperature range of -55°C to 125°C and is housed in a TO-99-8 Metal Can package for through-hole mounting. The part is currently Active in product status with 1752 pieces in stock. The LM555H/883 is specified for 51kHz frequency operation with a supply voltage range of 5V to 15V and supply current of 18.5 mA. Equivalent and substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when application requirements permit functional alternatives.

Substiute Parts

LM555H/883

Texas InstrumentsIn Stock: 1823LM555H/883 Datasheet

Current PartRFQ

LM555CN/NOPB

Texas InstrumentsIn Stock: 2247LM555CN/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM555H/883 is determined by the following critical parameters:

Functional Equivalence: Both the main part and substitute must be 555 Type Timer/Oscillator (Single) ICs manufactured by Texas Instruments, ensuring identical core timing functionality.

Supply Voltage Compatibility: The substitute must operate within a voltage range that encompasses or is compatible with the application's supply voltage requirements. The LM555H/883 operates at 5V ~ 15V.

Operating Temperature Range: The substitute's temperature range must meet or exceed the application's thermal requirements. The LM555H/883 operates from -55°C to 125°C.

Package and Mounting: While the LM555H/883 uses TO-99-8 Metal Can through-hole packaging, substitutes may use alternative through-hole packages (such as 8-DIP) provided the application's PCB layout and socket compatibility permit such changes.

Frequency Specification: The substitute's maximum frequency rating must support the application's timing requirements.

Compliance and Certifications: Both parts must maintain equivalent RoHS and regulatory compliance status.

Parameter Comparison

Engineering Selection Recommendations

LM555CN/NOPB Substitution Criteria

The LM555CN/NOPB is a functionally equivalent 555 Type Timer/Oscillator from Texas Instruments and qualifies as a substitute for the LM555H/883 under the following conditions:

Voltage Compatibility: The LM555CN/NOPB supply voltage range of 4.5V ~ 16V encompasses the LM555H/883 range of 5V ~ 15V, ensuring compatible operation across standard supply voltages.

Frequency Capability: The LM555CN/NOPB maximum frequency of 100kHz exceeds the LM555H/883 specification of 51kHz, supporting all timing applications within the original part's frequency envelope.

Temperature Range Limitation: The LM555CN/NOPB operating temperature range of 0°C ~ 70°C is narrower than the LM555H/883 range of -55°C ~ 125°C. Substitution is valid only for applications operating within the 0°C ~ 70°C window.

Package Consideration: The LM555CN/NOPB uses 8-DIP packaging versus the TO-99-8 Metal Can of the LM555H/883. PCB layout and socket compatibility must be verified before substitution.

Compliance Status: Both parts maintain ROHS3 compliance and Active product status, ensuring equivalent regulatory and supply chain standing.

Current Consumption: The LM555CN/NOPB draws 10 mA supply current compared to 18.5 mA for the LM555H/883, representing improved power efficiency in applications where this parameter is monitored.

Frequently Asked Questions (FAQ)

Q: Can the LM555CN/NOPB replace the LM555H/883 in all applications?

A: No. The LM555CN/NOPB is suitable only for applications operating within the 0°C to 70°C temperature range. Applications requiring operation below 0°C or above 70°C must use the LM555H/883 or equivalent parts with extended temperature specifications.

Q: What is the primary difference between these two parts?

A: The LM555H/883 is specified for extended temperature operation (-55°C to 125°C) in a TO-99-8 Metal Can package, while the LM555CN/NOPB operates within a commercial temperature range (0°C to 70°C) in an 8-DIP package. Both are functionally equivalent 555 Type Timer/Oscillators from Texas Instruments.

Q: Are there package compatibility concerns when substituting the LM555CN/NOPB?

A: Yes. The LM555H/883 uses TO-99-8 Metal Can through-hole packaging, while the LM555CN/NOPB uses 8-DIP packaging. Physical PCB layout, socket type, and pin spacing must be verified for compatibility. Both are through-hole mount types, but the package footprints differ.

Q: Does the LM555CN/NOPB meet the same compliance standards?

A: Yes. Both the LM555H/883 and LM555CN/NOPB are ROHS3 compliant and maintain Active product status with Texas Instruments.

Q: What is the frequency difference, and does it affect substitution?

A: The LM555CN/NOPB is rated for 100kHz maximum frequency, while the LM555H/883 is rated for 51kHz. The higher frequency rating of the LM555CN/NOPB supports all applications within the LM555H/883 frequency specification, making frequency compatibility unidirectional.

Q: How does supply current consumption differ between these parts?

A: The LM555CN/NOPB draws 10 mA supply current, while the LM555H/883 draws 18.5 mA. The LM555CN/NOPB offers lower power consumption for equivalent timing functionality.

Q: What supply voltage ranges are supported?

A: The LM555H/883 operates at 5V ~ 15V, and the LM555CN/NOPB operates at 4.5V ~ 16V. The LM555CN/NOPB range is slightly broader and fully encompasses the LM555H/883 range.