LM4040C33QFTA Equivalent & Substitute Parts

Part Overview

The LM4040C33QFTA is a shunt voltage reference IC manufactured by Diodes Incorporated, designed for precision voltage regulation applications. This fixed 3.3V reference device operates with ±0.5% tolerance and delivers up to 15 mA output current in a compact SOT-23-3 surface mount package. The component is classified as Active product status and carries automotive-grade qualification (AEC-Q100), making it suitable for demanding industrial and automotive applications. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

LM4040C33QFTA

Diodes IncorporatedIn Stock: 3570LM4040C33QFTA Datasheet

Current PartRFQ

LM4040C33FTA

Diodes IncorporatedIn Stock: 7898LM4040C33FTA Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM4040C33QFTA are identified based on strict electrical and mechanical parameter equivalence. The primary substitution criteria are:

Critical Matching Parameters:

• Reference Type: Shunt
• Output Voltage: 3.3V (Fixed)
• Output Current: 15 mA
• Tolerance: ±0.5%
• Temperature Coefficient: 100 ppm/°C
• Noise Performance: 35 µVrms (10Hz to 10kHz)
• Cathode Current: 70 µA
• Operating Temperature Range: -40°C to 125°C
• Package / Case: SOT-23-3 (TO-236-3, SC-59)
• Mounting Type: Surface Mount
• RoHS Compliance: ROHS3 Compliant

The LM4040C33FTA meets all specified electrical and mechanical parameters, confirming direct substitution capability within the same product family and manufacturing lineage.

Parameter Comparison

Engineering Selection Recommendations

Both the LM4040C33QFTA and LM4040C33FTA are Active product status components manufactured by Diodes Incorporated. Selection between these parts is based on availability and supply chain requirements rather than electrical or mechanical differentiation. Both components carry ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols. The LM4040C33FTA currently maintains higher inventory availability (7881 Pcs) compared to the LM4040C33QFTA (3510 Pcs), making it a viable alternative for high-volume production requirements. No performance degradation occurs when substituting between these parts, as all critical electrical parameters and package specifications remain identical.

Frequently Asked Questions (FAQ)

Q: Can LM4040C33FTA be used as a direct replacement for LM4040C33QFTA?

A: Yes. Both parts are electrically and mechanically identical, with matching output voltage (3.3V), tolerance (±0.5%), temperature coefficient (100 ppm/°C), and SOT-23-3 package specifications. Direct substitution is supported without circuit modification.

Q: What is the difference between the two part numbers?

A: The primary difference is packaging designation. LM4040C33QFTA specifies Tape & Reel (TR) packaging with automotive-grade qualification notation, while LM4040C33FTA also uses Tape & Reel packaging. Both maintain identical electrical performance and compliance certifications.

Q: Are both parts suitable for automotive applications?

A: The LM4040C33QFTA carries explicit automotive-grade designation with AEC-Q100 qualification. The LM4040C33FTA maintains equivalent electrical specifications and RoHS3 compliance. Verification of automotive qualification requirements for the substitute part should be confirmed against specific application standards.

Q: What is the SOT-23-3 package compatibility?

A: Both parts use the SOT-23-3 package (also designated TO-236-3 or SC-59), a three-pin surface mount package. PCB footprints and reflow profiles are identical between both components.

Q: Are there any supply chain advantages to using the substitute part?

A: The LM4040C33FTA maintains significantly higher inventory availability (7881 Pcs versus 3510 Pcs), providing supply chain flexibility for production scheduling and volume requirements.