LM4040B30FTA Equivalent & Substitute Parts

Part Overview

The LM4040B30FTA is a shunt voltage reference IC manufactured by Diodes Incorporated, designed to provide a fixed 3V output with ±0.2% tolerance. This surface-mount component operates across the industrial temperature range of -40°C to 125°C and is classified as Active product status. Shunt voltage references are essential in precision analog circuits requiring stable reference voltages for analog-to-digital converters, comparators, and calibration circuits. Alternative models become necessary when addressing specific packaging requirements, tighter tolerance specifications, extended temperature ranges, or alternative sourcing strategies.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM4040B30FTA
Manufacturer	Diodes Incorporated
Reference Type	Shunt
Output Voltage (Fixed)	3V
Output Current	15 mA
Voltage Tolerance	±0.2%
Temperature Coefficient	100 ppm/°C
Noise (10Hz to 10kHz)	35 µVrms
Cathode Current	70 µA
Operating Temperature Range	-40°C to 125°C
Package Type	SOT-23-3 (TO-236-3, SC-59)
Mounting Type	Surface Mount
Packaging Format	Tape & Reel (TR)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LM4040B30FTA is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Output voltage: 3V (fixed)
Output current capability: 15 mA
Package type: SOT-23-3
Mounting type: Surface Mount
Voltage tolerance: ±0.2% (or tighter)
Temperature coefficient: 100 ppm/°C
Reference type: Shunt

Substitution Categories:

Category 1: Parametric Equivalents (Identical Specifications) Parts meeting all electrical and mechanical specifications of the LM4040B30FTA with identical tolerance and temperature range. These are direct drop-in replacements.

Category 2: Manufacturer Recommended Alternatives (Tighter Tolerance) Parts with ±0.1% tolerance (superior to ±0.2%) and identical output voltage, current, and package. These offer improved precision while maintaining functional compatibility. Operating temperature ranges may differ.

Category 3: Cross-Manufacturer Alternatives Parts from different manufacturers (Texas Instruments, Analog Devices Inc./Maxim Integrated) meeting core electrical specifications with SOT-23-3 packaging. Packaging format (Cut Tape vs. Tape & Reel) may vary.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Tolerance	Output Current	Temp Coefficient	Noise (10Hz-10kHz)	Cathode Current	Operating Temp	Package	Packaging Format
LM4040B30FTA	Diodes Inc.	3V	±0.2%	15 mA	100 ppm/°C	35 µVrms	70 µA	-40°C to 125°C	SOT-23-3	Tape & Reel
LM4040B30QFTA	Diodes Inc.	3V	±0.2%	15 mA	100 ppm/°C	35 µVrms	70 µA	-40°C to 125°C	SOT-23-3	Tape & Reel
LM4040A30IDBZR	Texas Instruments	3V	±0.1%	15 mA	100 ppm/°C	35 µVrms	82 µA	-40°C to 85°C	SOT-23-3	Cut Tape & Digi-Reel
LM4040A30IDBZT	Texas Instruments	3V	±0.1%	15 mA	100 ppm/°C	35 µVrms	82 µA	-40°C to 85°C	SOT-23-3	Tape & Reel
LM4040AIM3-3.0+T	Analog Devices/Maxim	3V	±0.1%	15 mA	100 ppm/°C	45 µVrms	67 µA	-40°C to 85°C	SOT-23-3	Cut Tape & Digi-Reel
LM4040AIM3-3.0/NOPB	Texas Instruments	3V	±0.1%	15 mA	100 ppm/°C	35 µVrms	67 µA	-40°C to 85°C	SOT-23-3	Cut Tape & Digi-Reel
LM4040AIM3X-3.0/NOPB	Texas Instruments	3V	±0.1%	15 mA	100 ppm/°C	35 µVrms	67 µA	-40°C to 85°C	SOT-23-3	Cut Tape & Digi-Reel
LM4040B30IDBZR	Texas Instruments	3V	±0.2%	15 mA	100 ppm/°C	35 µVrms	82 µA	-40°C to 85°C	SOT-23-3	Cut Tape & Digi-Reel
LM4040B30IDBZT	Texas Instruments	3V	±0.2%	15 mA	100 ppm/°C	35 µVrms	82 µA	-40°C to 85°C	SOT-23-3	Tape & Reel
LM4040BIM3-3.0/NOPB	Texas Instruments	3V	±0.2%	15 mA	100 ppm/°C	35 µVrms	67 µA	-40°C to 85°C	SOT-23-3	Cut Tape & Digi-Reel
LM4040BIM3X-3.0/NOPB	Texas Instruments	3V	±0.2%	15 mA	100 ppm/°C	35 µVrms	67 µA	-40°C to 85°C	SOT-23-3	Tape & Reel

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): LM4040B30QFTA from Diodes Incorporated is a parametric equivalent with identical electrical specifications and operating temperature range (-40°C to 125°C). This part is suitable for direct substitution without circuit redesign.

Tighter Tolerance Alternative (±0.1%): The LM4040A series (LM4040A30IDBZR, LM4040A30IDBZT, LM4040AIM3-3.0/NOPB, LM4040AIM3X-3.0/NOPB, LM4040AIM3-3.0+T) offers superior voltage accuracy at ±0.1% tolerance. These parts are functionally compatible but operate at reduced maximum temperature (-40°C to 85°C versus -40°C to 125°C). Selection depends on whether the application requires the extended upper temperature range of the original part.

Same Tolerance, Alternative Packaging: LM4040B30IDBZR and LM4040B30IDBZT from Texas Instruments maintain ±0.2% tolerance and identical electrical performance. These are suitable when alternative packaging formats (Cut Tape & Digi-Reel or Tape & Reel) are required for manufacturing processes.

Compliance Considerations: All listed substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, ensuring regulatory equivalence with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use LM4040A series parts as a direct replacement for LM4040B30FTA? A: The LM4040A series provides tighter tolerance (±0.1% versus ±0.2%) and identical output voltage and current specifications. However, the maximum operating temperature is reduced from 125°C to 85°C. Substitution is valid only if your application does not require operation above 85°C.

Q: What is the difference between Tape & Reel (TR) and Cut Tape & Digi-Reel packaging? A: Both are surface-mount packaging formats for automated assembly. Tape & Reel is continuous reel packaging for high-volume production. Cut Tape & Digi-Reel provides smaller quantities on individual tape segments. The electrical performance is identical; selection depends on manufacturing volume and assembly equipment compatibility.

Q: Are Texas Instruments and Diodes Incorporated versions electrically interchangeable? A: Yes, when specifications match. Both manufacturers produce LM4040 series shunt voltage references with identical output voltage (3V), current (15 mA), and package (SOT-23-3). Verify tolerance, temperature range, and cathode current specifications for your specific application requirements.

Q: Does the cathode current difference (67 µA vs. 70 µA vs. 82 µA) affect circuit design? A: Cathode current represents the minimum operating current through the reference. Differences within this range are minor and do not typically require circuit redesign. Verify that your bias network supplies sufficient current to maintain regulation across all specified operating conditions.

Q: Can I substitute a part with lower noise specification (35 µVrms vs. 45 µVrms)? A: Yes. Lower noise is a performance improvement. Parts with 35 µVrms noise can replace specifications requiring 45 µVrms without circuit modification.

Q: What does the "X" designation in part numbers like LM4040AIM3X-3.0/NOPB indicate? A: The "X" suffix typically indicates extended or enhanced specifications within the same product family. Verify specific datasheet parameters, as the core electrical specifications (3V output, 15 mA, ±0.1% tolerance) remain consistent.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message