LM4040C30QFTA Equivalent & Substitute Parts

Part Overview

The LM4040C30QFTA is a shunt voltage reference integrated circuit manufactured by Diodes Incorporated. This device generates a fixed 3V reference output with ±0.5% tolerance and is packaged in a surface-mount SOT-23-3 configuration. The part is classified as active product status and carries automotive-grade qualification (AEC-Q100), making it suitable for demanding applications requiring stable voltage references.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set. The LM4040C30QFTA is supplied in Tape & Reel (TR) packaging; alternative packaging formats and manufacturer sources are available through the substitute parts listed below.

Substiute Parts

LM4040C30QFTA

Diodes IncorporatedIn Stock: 9380LM4040C30QFTA Datasheet

Current PartRFQ

LM4040C30FTA

Diodes IncorporatedIn Stock: 3676LM4040C30FTA Datasheet

Parametric EquivalentRFQ

LM4040C30QDBZR

Texas InstrumentsIn Stock: 17196LM4040C30QDBZR Datasheet

Parametric EquivalentRFQ

LM4040C30QDBZT

Texas InstrumentsIn Stock: 8893LM4040C30QDBZT Datasheet

Parametric EquivalentRFQ

LM4040CEM3-3.0/NOPB

Texas InstrumentsIn Stock: 4270LM4040CEM3-3.0/NOPB Datasheet

Parametric EquivalentRFQ

LM4040CEM3X-3.0/NOPB

Texas InstrumentsIn Stock: 7883LM4040CEM3X-3.0/NOPB Datasheet

Parametric EquivalentRFQ

LM4040QCEM3-3.0/NOPB

Texas InstrumentsIn Stock: 2130LM4040QCEM3-3.0/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM4040C30QFTA are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

• Reference Type: Shunt
• Output Type: Fixed
• Voltage - Output: 3V
• Current - Output: 15 mA
• Tolerance: ±0.5%
• Temperature Coefficient: 100 ppm/°C
• Noise (10Hz to 10kHz): 35 µVrms
• Operating Temperature Range: -40°C to 125°C
• Package / Case: SOT-23-3 (TO-236-3, SC-59)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

Allowable Variations:

• Manufacturer: Diodes Incorporated or Texas Instruments
• Packaging Format: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®
• Current - Cathode: 70 µA or 82 µA (minor operational variation)
• Moisture Sensitivity Level (MSL): 1 (Unlimited) where specified

All substitute parts maintain identical electrical performance specifications and are compatible with the same PCB footprint and thermal operating envelope as the main part.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Automotive-Grade, AEC-Q100 Qualified):

LM4040QCEM3-3.0/NOPB is the direct functional equivalent with automotive qualification matching the main part. This Texas Instruments part maintains all electrical specifications and carries AEC-Q100 certification. It is available in Cut Tape (CT) & Digi-Reel® packaging format.

Secondary Substitutes (Commercial-Grade, ROHS3 Compliant):

The following parts are electrically equivalent but do not carry automotive-grade qualification:

• LM4040C30FTA (Diodes Incorporated): Identical electrical performance with 70 µA cathode current. Available in Cut Tape (CT) & Digi-Reel® packaging.
• LM4040C30QDBZR (Texas Instruments): Equivalent performance with 82 µA cathode current. Available in Cut Tape (CT) & Digi-Reel® packaging.
• LM4040C30QDBZT (Texas Instruments): Equivalent performance with 82 µA cathode current. Available in Tape & Reel (TR) packaging.
• LM4040CEM3-3.0/NOPB (Texas Instruments): Identical electrical performance with 70 µA cathode current. Available in Tape & Reel (TR) packaging.
• LM4040CEM3X-3.0/NOPB (Texas Instruments): Identical electrical performance with 70 µA cathode current. Available in Cut Tape (CT) & Digi-Reel® packaging.

All substitute parts are active product status and ROHS3 compliant. Selection between substitutes depends on packaging format requirements (Tape & Reel versus Cut Tape & Digi-Reel) and automotive qualification necessity for the application.

Frequently Asked Questions (FAQ)

Q: Can LM4040C30FTA be used as a direct replacement for LM4040C30QFTA?

A: LM4040C30FTA is electrically equivalent with identical output voltage (3V), current rating (15 mA), tolerance (±0.5%), and temperature coefficient (100 ppm/°C). Both use SOT-23-3 packaging. The primary difference is packaging format: LM4040C30FTA is supplied in Cut Tape (CT) & Digi-Reel® format while LM4040C30QFTA is supplied in Tape & Reel (TR). Both are ROHS3 compliant. Selection depends on assembly equipment compatibility with the packaging format.

Q: What is the difference between LM4040C30QDBZR and LM4040C30QDBZT?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications. The difference is packaging format: LM4040C30QDBZR is supplied in Cut Tape (CT) & Digi-Reel® format, while LM4040C30QDBZT is supplied in Tape & Reel (TR) format. Both have 82 µA cathode current specification. Selection depends on assembly process requirements.

Q: Is LM4040QCEM3-3.0/NOPB suitable for automotive applications?

A: LM4040QCEM3-3.0/NOPB carries automotive-grade qualification and AEC-Q100 certification, matching the main part LM4040C30QFTA. It is suitable for automotive applications requiring qualified components. Electrical specifications are identical: 3V output, 15 mA current, ±0.5% tolerance, 100 ppm/°C temperature coefficient, and -40°C to 125°C operating range.

Q: What is the significance of the 70 µA versus 82 µA cathode current specification?

A: Cathode current represents the minimum operating current for the shunt reference. Both 70 µA and 82 µA specifications fall within the operational envelope of the device. Parts with 70 µA specification (LM4040C30QFTA, LM4040C30FTA, LM4040CEM3-3.0/NOPB, LM4040CEM3X-3.0/NOPB, LM4040QCEM3-3.0/NOPB) and parts with 82 µA specification (LM4040C30QDBZR, LM4040C30QDBZT) are functionally interchangeable in circuit applications.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance status. The main part LM4040C30QFTA and all substitute parts meet ROHS3 requirements.

Q: What packaging formats are available for LM4040 3V reference devices?

A: Two packaging formats are available: Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel®. Tape & Reel format is suitable for high-volume automated assembly. Cut Tape & Digi-Reel® format is suitable for lower-volume production or manual assembly processes. All parts use identical SOT-23-3 footprint.

Q: Can I substitute a commercial-grade part for an automotive-grade part?

A: Commercial-grade parts (LM4040C30FTA, LM4040C30QDBZR, LM4040C30QDBZT, LM4040CEM3-3.0/NOPB, LM4040CEM3X-3.0/NOPB) are not qualified for automotive applications. For automotive applications requiring AEC-Q100 qualification, use LM4040QCEM3-3.0/NOPB or the original LM4040C30QFTA.

Q: Are all substitute parts available in the same SOT-23-3 package?

A: All substitute parts use SOT-23-3 package (also designated TO-236-3 or SC-59). PCB footprint compatibility is maintained across all listed parts.