LM4040C10ILPR Equivalent & Substitute Parts

Part Overview

The LM4040C10ILPR is a shunt voltage reference IC manufactured by Texas Instruments, designed for precision voltage regulation applications. This device generates a fixed 10V output with ±0.5% tolerance and supports output currents up to 15 mA. The part is classified as Last Time Buy, indicating end-of-life status. Finding equivalent or substitute components is necessary to ensure continued availability for new designs and production continuity.

Substiute Parts

LM4040C10ILPR

Texas InstrumentsIn Stock: 1963LM4040C10ILPR Datasheet

Current PartRFQ

LM4040C82IDBZR

Texas InstrumentsIn Stock: 21070LM4040C82IDBZR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM4040C10ILPR is determined by the following critical parameters:

• Reference Type: Must be Shunt voltage reference
• Output Voltage: The substitute LM4040C82IDBZR provides 8.192V, which differs from the 10V output of the main part
• Output Current: Both parts support 15 mA maximum output current
• Voltage Tolerance: Both parts maintain ±0.5% tolerance
• Temperature Coefficient: Both parts specify 100 ppm/°C
• Operating Temperature Range: Both parts operate across -40°C to 85°C
• Mounting Type: The substitute uses Surface Mount (SOT-23-3) versus Through Hole (TO-92-3) for the main part
• Compliance: Both parts are ROHS3 compliant and REACH unaffected

The LM4040C82IDBZR is classified as an MFR Recommended substitute and shares the same base product number (LM4040) and core electrical characteristics. However, the output voltage differs (8.192V vs. 10V), requiring circuit-level evaluation for compatibility.

Parameter Comparison

Engineering Selection Recommendations

The LM4040C82IDBZR is designated as the MFR Recommended substitute for the LM4040C10ILPR. Selection between these parts should be based on the following factors:

Product Status: The main part (LM4040C10ILPR) is Last Time Buy, while the substitute (LM4040C82IDBZR) is Active. For new designs and long-term production, the Active status of the substitute provides superior supply chain continuity.

Compliance: Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Packaging and Mounting: The main part uses Through Hole (TO-92-3) mounting, while the substitute uses Surface Mount (SOT-23-3). This difference requires PCB redesign if substitution is implemented.

Output Voltage Difference: The substitute provides 8.192V instead of 10V. This voltage difference necessitates circuit-level analysis to determine compatibility with the application's voltage regulation requirements.

Frequently Asked Questions (FAQ)

Q: Can the LM4040C82IDBZR directly replace the LM4040C10ILPR without circuit modifications?

A: Direct replacement is not possible due to two key differences: (1) output voltage differs (8.192V vs. 10V), and (2) mounting type differs (Surface Mount vs. Through Hole). Circuit redesign and PCB layout changes are required.

Q: What are the core electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by reference type (Shunt), output current rating (15 mA), voltage tolerance (±0.5%), temperature coefficient (100 ppm/°C), and operating temperature range (-40°C to 85°C). Output voltage is application-dependent and must be evaluated separately.

Q: Why does the substitute have lower noise specifications?

A: The LM4040C82IDBZR specifies 130 µVrms noise (10Hz to 10kHz) compared to 180 µVrms for the main part. This represents improved noise performance in the substitute, which may provide benefits in noise-sensitive applications.

Q: What is the significance of the Last Time Buy status for the main part?

A: Last Time Buy indicates the manufacturer will no longer produce the LM4040C10ILPR after a specified date. Existing inventory is limited, making the Active-status substitute necessary for continued production beyond the Last Time Buy window.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the LM4040C10ILPR and LM4040C82IDBZR are ROHS3 compliant and REACH unaffected, meeting current electronic component regulatory requirements.