LM4040C82IDBZT Equivalent & Substitute Parts

Part Overview

The LM4040C82IDBZT is a shunt voltage reference IC from Texas Instruments, delivering a fixed 8.192V output with ±0.5% tolerance in a SOT-23-3 surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across the industrial temperature range of -40°C to 85°C and is suitable for precision voltage reference applications requiring low noise performance.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM4040C82IDBZT
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Reference Type	Shunt
Output Voltage	8.192V Fixed
Output Current	15 mA
Tolerance	±0.5%
Temperature Coefficient	100 ppm/°C
Noise (10Hz to 10kHz)	130 µVrms
Cathode Current	110 µA
Operating Temperature	-40°C to 85°C
Package	SOT-23-3 (TO-236-3, SC-59)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM4040C82IDBZT is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Requirements:

Output voltage: 8.192V fixed (non-negotiable)
Output current capability: 15 mA minimum
Tolerance: ±0.5% or better
Temperature coefficient: 100 ppm/°C or lower
Operating temperature range: -40°C to 85°C minimum
Noise performance: 130 µVrms or lower (10Hz to 10kHz)

Mechanical Compatibility Requirements:

Package: SOT-23-3 (TO-236-3, SC-59)
Mounting type: Surface Mount
Pin configuration: Identical to original

Compliance Requirements:

RoHS3 compliance
MSL rating: 1 (Unlimited)

Substitute parts are categorized as either MFR Recommended (active status, superior specifications) or Parametric Equivalent (matching or equivalent specifications). All listed substitutes maintain identical package geometry and pin configuration, ensuring direct board-level replacement without layout modification.

Parameter Comparison

Parameter	LM4040C82IDBZT (Main)	LM4040BIM3-8.2/NOPB	LM4050AEM3-8.2/NOPB	LM4040C82IDBZR	LM4040CIM3-8.2	LM4040CIM3-8.2/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	8.192V	8.192V	8.192V	8.192V	8.192V	8.192V
Output Current	15 mA	15 mA	15 mA	15 mA	15 mA	15 mA
Tolerance	±0.5%	±0.2%	±0.1%	±0.5%	±0.5%	±0.5%
Temperature Coefficient	100 ppm/°C	100 ppm/°C	50 ppm/°C	100 ppm/°C	100 ppm/°C	100 ppm/°C
Noise (10Hz to 10kHz)	130 µVrms	130 µVrms	150 µVrms	130 µVrms	130 µVrms	130 µVrms
Cathode Current	110 µA	95 µA	100 µA	110 µA	95 µA	95 µA
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 125°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Package	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Product Status	Obsolete	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

MFR Recommended Substitutes (Active Status):

LM4040BIM3-8.2/NOPB is the primary recommended substitute. It maintains identical electrical specifications to the original part while offering improved tolerance (±0.2% versus ±0.5%) and lower cathode current (95 µA versus 110 µA). Active product status ensures long-term availability and supply chain continuity. Tape & Reel packaging is standard for production environments.

LM4050AEM3-8.2/NOPB provides superior performance with ±0.1% tolerance and 50 ppm/°C temperature coefficient, suitable for applications requiring enhanced precision. Extended operating temperature range (-40°C to 125°C) accommodates higher ambient conditions. Increased noise specification (150 µVrms) remains within acceptable limits for most applications.

Parametric Equivalents (Active Status):

LM4040C82IDBZR is an exact electrical and mechanical equivalent with identical specifications. Active product status and higher inventory availability (20,989 pcs) make this the preferred choice for direct replacement when original part sourcing is constrained. Tape & Reel packaging is suitable for automated assembly.

LM4040CIM3-8.2/NOPB matches all electrical parameters with active product status. Tape & Reel packaging and 6,400 pcs inventory provide reliable procurement options.

Obsolete Alternatives (Not Recommended for New Designs):

LM4040CIM3-8.2 is electrically equivalent but carries obsolete status. Use only when existing inventory must be consumed or for legacy system maintenance.

All recommended substitutes maintain ROHS3 compliance and MSL rating 1 (Unlimited), ensuring compatibility with standard manufacturing processes and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can LM4040BIM3-8.2/NOPB directly replace LM4040C82IDBZT without circuit modification?

A: Yes. Both parts share identical output voltage (8.192V), output current (15 mA), operating temperature range (-40°C to 85°C), and SOT-23-3 package. The improved tolerance (±0.2% versus ±0.5%) and lower cathode current (95 µA versus 110 µA) are backward-compatible enhancements requiring no design changes.

Q: What is the difference between LM4040C82IDBZT and LM4040C82IDBZR?

A: These parts are electrically and mechanically identical. The primary difference is packaging format: IDBZT indicates tube packaging, while IDBZR indicates Tape & Reel. Both are SOT-23-3 surface mount packages. IDBZR is preferred for production environments due to automated handling compatibility.

Q: Is LM4050AEM3-8.2/NOPB suitable for applications originally designed for LM4040C82IDBZT?

A: Yes, with consideration of enhanced specifications. The LM4050AEM3-8.2/NOPB provides superior tolerance (±0.1% versus ±0.5%) and lower temperature coefficient (50 ppm/°C versus 100 ppm/°C), making it a direct upgrade. Extended operating temperature range (-40°C to 125°C) supports higher ambient conditions. Slightly elevated noise (150 µVrms versus 130 µVrms) remains acceptable for most precision reference applications.

Q: Why is LM4040C82IDBZT marked as obsolete?

A: Obsolete status indicates Texas Instruments has discontinued active production and support. Equivalent active alternatives (LM4040BIM3-8.2/NOPB, LM4040C82IDBZR, LM4040CIM3-8.2/NOPB) provide identical or superior performance with guaranteed long-term availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitutes carry ROHS3 Compliant status and MSL rating 1 (Unlimited), meeting standard environmental and moisture sensitivity requirements for industrial and commercial applications.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in two packaging formats: Tape & Reel (TR) for automated production assembly, and tube packaging for manual handling. All maintain identical SOT-23-3 (TO-236-3, SC-59) physical dimensions and pin configuration.

Q: Can obsolete parts (LM4040CIM3-8.2) be used in new designs?

A: No. Obsolete parts lack manufacturer support and long-term availability guarantees. New designs must use active status alternatives: LM4040BIM3-8.2/NOPB, LM4040C82IDBZR, or LM4040CIM3-8.2/NOPB.

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