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LM4040DIM3X-4.1 Equivalent & Substitute Parts
Part Overview
The LM4040DIM3X-4.1 is a shunt voltage reference IC manufactured by Texas Instruments, delivering a fixed 4.096V output with ±1% tolerance in a SOT-23-3 surface mount package. This device operates across the industrial temperature range of -40°C to 85°C and is classified as not for new designs. Due to its obsolescence status and the availability of higher-precision alternatives with improved specifications, substitute parts with tighter tolerances and active product status are necessary for new circuit implementations and long-term design reliability.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reference Type | Shunt |
| Output Type | Fixed |
| Voltage - Output (Min/Fixed) | 4.096V |
| Current - Output | 15 mA |
| Tolerance | ±1% |
| Temperature Coefficient | 150ppm/°C |
| Noise - 10Hz to 10kHz | 80µVrms |
| Current - Cathode | 78 µA |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | TO-236-3, SC-59, SOT-23-3 |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the LM4040DIM3X-4.1 is determined by strict equivalence in the following electrical and mechanical parameters:
- Output Voltage: Must be 4.096V fixed
- Output Current: Must be 15 mA
- Package Type: Must be SOT-23-3 (TO-236-3, SC-59)
- Mounting Type: Must be Surface Mount
- Operating Temperature Range: Must support -40°C to 85°C minimum
Substitute parts are grouped by tolerance grade (±0.1%, ±0.2%, ±0.5%) and temperature coefficient performance. All listed substitutes maintain the same output voltage, current rating, and package footprint. Differences in tolerance, temperature coefficient, and cathode current represent performance improvements or alternative packaging formats (Cut Tape vs. Tape & Reel).
Parameter Comparison
| Part Number | Manufacturer | Tolerance | Temp Coeff (ppm/°C) | Cathode Current (µA) | Operating Temp (°C) | Product Status | RoHS Status | Packaging |
|---|---|---|---|---|---|---|---|---|
| LM4040DIM3X-4.1 | Texas Instruments | ±1% | 150 | 78 | -40 ~ 85 | Not For New Designs | RoHS non-compliant | SOT-23-3 |
| LM4040A41IDBZR | Texas Instruments | ±0.1% | 100 | 88 | -40 ~ 85 | Active | ROHS3 Compliant | Cut Tape (CT) & Digi-Reel® |
| LM4040A41IDBZT | Texas Instruments | ±0.1% | 100 | 88 | -40 ~ 85 | Active | ROHS3 Compliant | Tape & Reel (TR) |
| LM4040B41IDBZR | National Semiconductor | ±0.2% | 100 | 88 | -40 ~ 85 | Active | Not specified | SOT-23-3 |
| LM4040B41IDBZT | Texas Instruments | ±0.2% | 100 | 88 | -40 ~ 85 | Active | ROHS3 Compliant | Tape & Reel (TR) |
| LM4040C41IDBZR | National Semiconductor | ±0.5% | 100 | 88 | -40 ~ 85 | Active | Not specified | SOT-23-3 |
| LM4040C41IDBZT | Texas Instruments | ±0.5% | 100 | 88 | -40 ~ 85 | Active | ROHS3 Compliant | Tape & Reel (TR) |
| TL4050A41IDBZR | Texas Instruments | ±0.1% | 50 | 73 | -40 ~ 85 | Active | ROHS3 Compliant | Tape & Reel (TR) |
| TL4050A41IDBZT | Texas Instruments | ±0.1% | 50 | 73 | -40 ~ 85 | Active | ROHS3 Compliant | Tape & Reel (TR) |
| TL4050A41QDBZR | Texas Instruments | ±0.1% | 50 | 78 | -40 ~ 125 | Active | ROHS3 Compliant | Tape & Reel (TR) |
| TL4050A41QDBZT | Texas Instruments | ±0.1% | 50 | 78 | -40 ~ 125 | Active | ROHS3 Compliant | Tape & Reel (TR) |
Engineering Selection Recommendations
All substitute parts listed maintain electrical and mechanical compatibility with the LM4040DIM3X-4.1 footprint and functional requirements. Selection should prioritize active product status and RoHS3 compliance for new designs.
LM4040 Series (A/B/C grades): These Texas Instruments and National Semiconductor parts offer improved tolerance grades (±0.1%, ±0.2%, ±0.5%) compared to the original ±1% specification, with reduced temperature coefficient (100ppm/°C vs. 150ppm/°C). All variants are active products with ROHS3 compliance. The LM4040A41 grade provides the tightest tolerance at ±0.1% and is recommended for precision reference applications.
TL4050 Series: The TL4050A41 variants represent the highest performance option with ±0.1% tolerance, superior temperature coefficient (50ppm/°C), and extended temperature range options. The TL4050A41QDBZR and TL4050A41QDBZT variants support -40°C to 125°C operation, suitable for high-temperature environments. All TL4050 parts are active and ROHS3 compliant.
Packaging Considerations: Cut Tape (CT) & Digi-Reel® packaging (LM4040A41IDBZR) is suitable for lower-volume applications. Tape & Reel (TR) packaging variants are optimized for automated assembly and higher-volume production.
Frequently Asked Questions (FAQ)
Q: Can the LM4040DIM3X-4.1 be directly replaced with any of these substitutes?
A: Yes. All listed substitutes maintain the same 4.096V fixed output, 15 mA current rating, SOT-23-3 package, and -40°C to 85°C operating range. Direct footprint and functional replacement is possible without circuit modification.
Q: What is the primary advantage of upgrading to LM4040A41 or TL4050A41 variants?
A: The primary advantages are tighter output voltage tolerance (±0.1% vs. ±1%), lower temperature coefficient (100ppm/°C or 50ppm/°C vs. 150ppm/°C), active product status, and RoHS3 compliance. These improvements enhance reference accuracy and long-term stability across temperature variations.
Q: Are there differences between LM4040 and TL4050 series?
A: Both series deliver 4.096V fixed output in SOT-23-3 packages. The TL4050 series offers superior temperature coefficient performance (50ppm/°C vs. 100ppm/°C for LM4040 grades) and extended temperature range options (up to 125°C). Selection depends on thermal stability and temperature range requirements.
Q: What is the difference between Cut Tape and Tape & Reel packaging?
A: Cut Tape (CT) & Digi-Reel® packaging is suitable for manual handling and lower-volume applications. Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly equipment and higher-volume production runs. Both formats contain identical die and electrical specifications.
Q: Why is the original LM4040DIM3X-4.1 marked "Not For New Designs"?
A: This status indicates the part is in mature or end-of-life phase. Texas Instruments recommends using active alternatives for new circuit designs to ensure long-term availability and support. All listed substitutes carry active product status.
Q: Is RoHS3 compliance required for my application?
A: RoHS3 compliance is mandatory for products sold in the European Union and many other regulated markets. All substitute parts except LM4040B41IDBZR and LM4040C41IDBZR are ROHS3 compliant. Verify regulatory requirements for your target market.
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