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LM4040C50QFTA Equivalent & Substitute Parts
Part Overview
The LM4040C50QFTA is a shunt voltage reference IC manufactured by Diodes Incorporated, classified as a Power Management (PMIC) component. This device generates a fixed 5V output with ±0.5% tolerance and is packaged in SOT-23-3 surface mount configuration. The part is supplied in Tape & Reel (TR) packaging and maintains Active product status with AEC-Q100 automotive qualification.
Substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when sourcing from multiple manufacturers is required for supply chain resilience. The LM4040C50QFTA has multiple equivalent alternatives available from Diodes Incorporated, Texas Instruments, and Analog Devices Inc./Maxim Integrated that maintain identical electrical specifications and mechanical compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reference Type | Shunt |
| Output Type | Fixed |
| Voltage - Output (Min/Fixed) | 5V |
| Current - Output | 15 mA |
| Tolerance | ±0.5% |
| Temperature Coefficient | 100 ppm/°C |
| Noise - 10Hz to 10kHz | 80 µVrms |
| Current - Cathode | 83 µA |
| Operating Temperature | -40°C ~ 125°C (TA) |
| Package / Case | TO-236-3, SC-59, SOT-23-3 |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Grade | Automotive |
| Qualification | AEC-Q100 |
Substitute Part Grouping Explanation
Substitution of the LM4040C50QFTA is determined by strict equivalence across the following critical parameters:
Electrical Equivalence Requirements:
- Reference Type: Shunt
- Output Type: Fixed
- Voltage - Output: 5V
- Current - Output: 15 mA
- Tolerance: ±0.5%
- Temperature Coefficient: 100 ppm/°C
- Noise - 10Hz to 10kHz: 80 µVrms
- Operating Temperature Range: -40°C ~ 125°C
Mechanical Equivalence Requirements:
- Package / Case: TO-236-3, SC-59, SOT-23-3
- Mounting Type: Surface Mount
- Supplier Device Package: SOT-23-3
Compliance Requirements:
- RoHS Status: ROHS3 Compliant
- REACH Status: REACH Unaffected
All substitute parts listed maintain these parameters. Variations in cathode current (80–95 µA range) and packaging format (Tape & Reel, Cut Tape, or Bulk) do not affect functional substitution. Product status differences and MSL ratings are noted for procurement planning but do not prevent electrical or mechanical substitution.
Parameter Comparison
| Part Number | Manufacturer | Packaging | Voltage Output | Current Output | Tolerance | Temp Coeff | Cathode Current | Operating Temp | Product Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|
| LM4040C50QFTA | Diodes Incorporated | Tape & Reel (TR) | 5V | 15 mA | ±0.5% | 100 ppm/°C | 83 µA | -40°C ~ 125°C | Active | ROHS3 |
| LM4040C50FTA | Diodes Incorporated | Cut Tape (CT) & Digi-Reel® | 5V | 15 mA | ±0.5% | 100 ppm/°C | 83 µA | -40°C ~ 125°C | Active | ROHS3 |
| LM4040C50QDBZR | Texas Instruments | Tape & Reel (TR) | 5V | 15 mA | ±0.5% | 100 ppm/°C | 95 µA | -40°C ~ 125°C | Active | ROHS3 |
| LM4040C50QDBZT | Texas Instruments | Tape & Reel (TR) | 5V | 15 mA | ±0.5% | 100 ppm/°C | 95 µA | -40°C ~ 125°C | Active | ROHS3 |
| LM4040CEM3-5.0 | Analog Devices, Inc. | Bulk | 5V | 15 mA | ±0.5% | 100 ppm/°C | 83 µA | -40°C ~ 125°C | Obsolete | Non-compliant |
| LM4040CEM3-5.0+T | Analog Devices Inc./Maxim Integrated | Tape & Reel (TR) | 5V | 15 mA | ±0.5% | 100 ppm/°C | 80 µA | -40°C ~ 125°C | Active | ROHS3 |
| LM4040CEM3-5.0/NOPB | Texas Instruments | Tape & Reel (TR) | 5V | 15 mA | ±0.5% | 100 ppm/°C | 83 µA | -40°C ~ 125°C | Active | ROHS3 |
| LM4040CEM3-5.0/V+T | Analog Devices Inc./Maxim Integrated | Tape & Reel (TR) | 5V | 15 mA | ±0.5% | 100 ppm/°C | 80 µA | -40°C ~ 125°C | Active | ROHS3 |
| LM4040CEM3X-5.0/NOPB | Texas Instruments | Tape & Reel (TR) | 5V | 15 mA | ±0.5% | 100 ppm/°C | 83 µA | -40°C ~ 125°C | Active | ROHS3 |
Engineering Selection Recommendations
Primary Substitutes (Recommended for New Designs):
The LM4040C50FTA (Diodes Incorporated, Cut Tape & Digi-Reel packaging) and LM4040CEM3-5.0/NOPB (Texas Instruments, Tape & Reel) are direct electrical and mechanical equivalents with Active product status and ROHS3 compliance. Both maintain identical output specifications and operating temperature range. Selection between these depends on packaging format requirements: LM4040C50FTA for cut tape applications, LM4040CEM3-5.0/NOPB for tape and reel supply.
Automotive-Grade Alternatives:
The LM4040CEM3-5.0/V+T (Analog Devices Inc./Maxim Integrated) carries AEC-Q100 automotive qualification matching the primary part. This part is suitable for automotive applications requiring certified components and is available in Tape & Reel packaging with ROHS3 compliance and Active status.
Texas Instruments Alternatives:
The LM4040C50QDBZR and LM4040C50QDBZT (both Texas Instruments) are functionally equivalent with cathode current of 95 µA (within acceptable range). Both maintain Active status, ROHS3 compliance, and Tape & Reel packaging. These parts are suitable for applications where Texas Instruments sourcing is preferred.
Obsolete Part Consideration:
The LM4040CEM3-5.0 (Analog Devices, Inc.) carries Obsolete product status and RoHS non-compliance. This part is not recommended for new designs or long-term supply chain planning.
Frequently Asked Questions (FAQ)
Q: Can the LM4040C50FTA replace the LM4040C50QFTA in production?
A: Yes. Both parts are manufactured by Diodes Incorporated and maintain identical electrical specifications (5V output, ±0.5% tolerance, 15 mA output current, 100 ppm/°C temperature coefficient). The primary difference is packaging format: LM4040C50QFTA is supplied in Tape & Reel, while LM4040C50FTA is supplied in Cut Tape & Digi-Reel. Both use SOT-23-3 surface mount packages and are mechanically compatible on PCBs.
Q: What is the significance of cathode current variations (80–95 µA) among substitute parts?
A: Cathode current variations within the 80–95 µA range do not affect functional substitution. This parameter reflects minor manufacturing variations across different manufacturers and production batches. All listed parts maintain the same output voltage, tolerance, and temperature coefficient specifications required for circuit operation.
Q: Are Texas Instruments LM4040C50QDBZR and LM4040C50QDBZT interchangeable?
A: Yes. Both parts are manufactured by Texas Instruments with identical electrical specifications and SOT-23-3 packaging. The difference in part number suffix (QDBZR vs. QDBZT) reflects internal Texas Instruments manufacturing codes and does not indicate functional differences. Both are suitable for direct substitution.
Q: Is the LM4040CEM3-5.0 (Obsolete) suitable for new designs?
A: No. This part carries Obsolete product status and RoHS non-compliance. It is not recommended for new designs or applications requiring long-term component availability. Use Active-status alternatives such as LM4040C50FTA, LM4040CEM3-5.0/NOPB, or LM4040CEM3-5.0/V+T instead.
Q: Which substitute part is recommended for automotive applications?
A: The LM4040CEM3-5.0/V+T (Analog Devices Inc./Maxim Integrated) carries AEC-Q100 automotive qualification, matching the primary part's automotive grade. This part is suitable for automotive circuit designs requiring certified components and is available in Tape & Reel packaging with ROHS3 compliance and Active product status.
Q: Can I use LM4040CEM3-5.0+T as a substitute?
A: Yes. The LM4040CEM3-5.0+T (Analog Devices Inc./Maxim Integrated) is electrically equivalent with 5V output, ±0.5% tolerance, and 100 ppm/°C temperature coefficient. It is supplied in Tape & Reel packaging with ROHS3 compliance and Active status. Cathode current is 80 µA, within the acceptable range for this device category.
Q: What packaging formats are available among substitute parts?
A: Substitute parts are available in three packaging formats: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel, and Bulk. The primary part LM4040C50QFTA is supplied in Tape & Reel. Most substitutes (LM4040C50QDBZR, LM4040C50QDBZT, LM4040CEM3-5.0+T, LM4040CEM3-5.0/NOPB, LM4040CEM3-5.0/V+T, LM4040CEM3X-5.0/NOPB) are also available in Tape & Reel. The LM4040C50FTA is available in Cut Tape & Digi-Reel format. Selection depends on manufacturing process requirements.
Q: Are all substitute parts ROHS3 compliant?
A: All substitute parts except LM4040CEM3-5.0 are ROHS3 compliant. The LM4040CEM3-5.0 is RoHS non-compliant and carries Obsolete status. For new designs and applications requiring RoHS compliance, use any of the other listed substitutes.
Q: What is the difference between LM4040CEM3-5.0/NOPB and LM4040CEM3X-5.0/NOPB?
A: Both parts are manufactured by Texas Instruments with identical electrical specifications and SOT-23-3 packaging. The "X" designation in LM4040CEM3X-5.0/NOPB indicates an extended or alternative manufacturing variant. Both maintain 5V output, ±0.5% tolerance, 100 ppm/°C temperature coefficient, and ROHS3 compliance. Both are suitable for direct substitution.
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