LM4040C41IDBZRG4 Equivalent & Substitute Parts

Part Overview

The LM4040C41IDBZRG4 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 4.096V output with ±0.5% tolerance. This device operates as a precision voltage reference in power management applications, featuring a 15 mA output current capability and SOT-23-3 surface mount packaging. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM4040C41IDBZRG4
Manufacturer	Texas Instruments
Reference Type	Shunt
Output Voltage (Fixed)	4.096V
Output Current	15 mA
Tolerance	±0.5%
Temperature Coefficient	100 ppm/°C
Noise (10Hz to 10kHz)	80 µVrms
Cathode Current	88 µA
Operating Temperature Range	-40°C to 85°C
Package / Case	SOT-23-3 (TO-236-3, SC-59)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LM4040C41IDBZRG4 is determined by the following critical parameters:

Fixed Substitution Criteria:

Output voltage: 4.096V (fixed requirement)
Reference type: Shunt (fixed requirement)
Output current: 15 mA (fixed requirement)
Package: SOT-23-3 surface mount (fixed requirement)
Operating temperature range: -40°C to 85°C (fixed requirement)

Variable Substitution Parameters:

Tolerance: ±0.5% or tighter (±0.1%, ±0.2%, ±1%)
Temperature coefficient: 50 ppm/°C to 150 ppm/°C
Cathode current: 73 µA to 88 µA
Noise specification: 80 µVrms to 93 µVrms
Product status: Active preferred (obsolete parts have limited availability)

All substitute parts listed maintain identical output voltage, reference type, output current, package configuration, and operating temperature range. Variations in tolerance, temperature coefficient, and noise performance are acceptable within the LM4040 and LM4050 series families.

Parameter Comparison

Part Number	Tolerance	Temperature Coefficient	Cathode Current	Noise (10Hz-10kHz)	Product Status	Inventory
LM4040C41IDBZRG4	±0.5%	100 ppm/°C	88 µA	80 µVrms	Obsolete	5800 Pcs
LM4050CIM3-4.1/NOPB	±0.5%	50 ppm/°C	73 µA	93 µVrms	Active	2834 Pcs
LM4050CIM3X-4.1/NOPB	±0.5%	50 ppm/°C	73 µA	93 µVrms	Active	4000 Pcs
LM4040AIM3-4.1/NOPB	±0.1%	100 ppm/°C	73 µA	80 µVrms	Active	44900 Pcs
LM4040AIM3X-4.1/NOPB	±0.1%	100 ppm/°C	73 µA	80 µVrms	Active	45000 Pcs
LM4040BIM3-4.1/NOPB	±0.2%	100 ppm/°C	73 µA	80 µVrms	Active	1315 Pcs
LM4040BIM3X-4.1/NOPB	±0.2%	100 ppm/°C	73 µA	80 µVrms	Active	4200 Pcs
LM4040DIM3-4.1/NOPB	±1%	150 ppm/°C	78 µA	80 µVrms	Active	17200 Pcs
LM4040DIM3X-4.1/NOPB	±1%	150 ppm/°C	78 µA	80 µVrms	Active	17300 Pcs
LM4050AIM3-4.1/NOPB	±0.1%	50 ppm/°C	73 µA	93 µVrms	Active	10340 Pcs
LM4050AIM3X-4.1/NOPB	±0.1%	50 ppm/°C	73 µA	93 µVrms	Active	1020 Pcs

Engineering Selection Recommendations

Primary Substitutes (Matched Tolerance): LM4050CIM3-4.1/NOPB and LM4050CIM3X-4.1/NOPB maintain the ±0.5% tolerance specification of the original part. Both are active products with robust inventory levels. The LM4050 series offers improved temperature coefficient performance (50 ppm/°C versus 100 ppm/°C), resulting in superior long-term stability across the operating temperature range.

Enhanced Performance Alternatives: LM4040AIM3-4.1/NOPB and LM4040AIM3X-4.1/NOPB provide tighter ±0.1% tolerance with significantly higher inventory availability (44,900 and 45,000 units respectively). These parts are suitable for applications requiring improved output voltage accuracy while maintaining identical temperature coefficient and noise characteristics.

Cost-Optimized Alternatives: LM4040DIM3-4.1/NOPB and LM4040DIM3X-4.1/NOPB offer the highest inventory levels (17,200 and 17,300 units) with ±1% tolerance. These parts are appropriate for applications where the original ±0.5% specification can be relaxed without compromising circuit performance.

Compliance Status: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating, ensuring compatibility with existing manufacturing and supply chain processes.

Frequently Asked Questions (FAQ)

Q: Can LM4050 series parts directly replace LM4040C41IDBZRG4? A: Yes. LM4050CIM3-4.1/NOPB and LM4050CIM3X-4.1/NOPB are direct substitutes with identical output voltage, current, package, and operating temperature range. The LM4050 series features improved temperature coefficient (50 ppm/°C) compared to the original part (100 ppm/°C), providing enhanced stability.

Q: What is the difference between IM3 and IM3X package designations? A: Both designations refer to SOT-23-3 surface mount packaging. The primary difference is packaging format: IM3 typically indicates Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® configurations, while IM3X indicates alternative packaging variants. Electrical specifications remain identical.

Q: Can I use LM4040AIM3-4.1/NOPB with ±0.1% tolerance in place of the ±0.5% original part? A: Yes. Tighter tolerance specifications are functionally compatible and provide improved accuracy. LM4040AIM3-4.1/NOPB offers superior output voltage precision with no negative impact on circuit operation.

Q: Are there inventory concerns with substitute parts? A: LM4040AIM3-4.1/NOPB and LM4040AIM3X-4.1/NOPB offer the highest inventory levels (44,900 and 45,000 units). LM4050CIM3-4.1/NOPB and LM4050CIM3X-4.1/NOPB provide adequate stock (2,834 and 4,000 units respectively). All substitute parts are active products with ongoing manufacturing support.

Q: Does the cathode current difference affect circuit design? A: Cathode current variations (73 µA to 88 µA) are within normal operating parameters for shunt voltage reference applications. Circuit designs accommodating the original 88 µA specification will function correctly with substitute parts rated at 73 µA or 78 µA.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring compatibility with environmental and regulatory requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message