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Analog Devices Inc./Maxim Integrated LM4040BIM3-2.1
- Part No.:
- LM4040BIM3-2.1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040BIM3-2.1.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,251
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Product details
Overview
LM4040BIM3-2.1 from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SC70-3 package, featuring 0.2% initial accuracy, ±100ppm/°C temperature coefficient, and 60µA–15mA operating current range. It serves as a stable reference in battery-powered instrumentation, ADC/DAC biasing, and portable power management circuits where space and low quiescent current are critical.
For engineers reviewing the LM4040BIM3-2.1 datasheet, LM4040BIM3-2.1 pinout, LM4040BIM3-2.1 application, or LM4040BIM3-2.1 equivalent, key selection considerations include its guaranteed -40°C to +85°C operation, no-output-capacitor stability, 28µVRMS wideband noise (10Hz–10kHz), and compatibility with capacitive loads without oscillation risk.
Technical Context
The LM4040BIM3-2.1 implements a bandgap-based shunt reference architecture, functioning like an ideal Zener diode with reverse breakdown at precisely 2.048V. Its laser-trimmed resistor network ensures factory-calibrated accuracy, while internal design eliminates need for external stabilization capacitance across all load conditions.
It maintains regulation over 60µA–15mA shunt current and exhibits low dynamic impedance (≤0.8Ω at 1mA), enabling stable output under varying supply and load transients. Temperature drift is bounded by ±15ppm/°C typical and ±100ppm/°C max over full operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±4.0mV (±0.2%) initial tolerance at +25°C ensures tight system-level calibration without trimming. |
| Tempco | ±100ppm/°C max over -40°C to +85°C; contributes ≤±8.2mV total drift across full range, supporting industrial-grade accuracy. |
| Operating Current | 60µA min to 15mA max; enables ultra-low-power sensor nodes and high-current reference buffering in same device. |
| Dynamic Impedance | ≤0.8Ω at 1mA; minimizes output voltage shift during load transients, critical for precision data converters. |
| Output Noise | 28µVRMS (10Hz–10kHz); low enough for 16-bit+ SAR ADC references without additional filtering. |
| Long-Term Stability | 120ppm after 1000h; supports >10-year system reliability in unattended monitoring applications. |
Pinout & Package
LM4040BIM3-2.1 is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is NC and must be left unconnected or tied to Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Cathode input terminal | Positive reference terminal; connects to current-limiting resistor and load return path. |
| 2 (−) | Cathode / Anode output terminal | Negative reference terminal; provides stable 2.048V relative to Pin 1 when reverse-biased. |
| 3 (N.C.) | No connection | Must be floating or shorted to Pin 2; no internal function-ensures mechanical robustness without electrical impact. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves PCB space in wearables and compact IoT sensors. |
| No output capacitor required | Guaranteed stability with any capacitive load eliminates BOM cost and layout sensitivity. |
| Wide shunt current range | 60µA–15mA operation supports both micropower sleep modes and active high-accuracy measurement phases. |
| Low wideband noise | 28µVRMS enables direct use in 16-bit ADC reference paths without noise-filtering components. |
| Laser-trimmed accuracy | 0.2% initial tolerance reduces system calibration overhead in production test. |
Applications
| Portable Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes requiring stable reference under variable battery voltage (2.8V–4.2V). IC Role / Device Role / Timing Role: Shunt voltage reference providing 2.048V基准 for 12-bit ADC front-end and display driver biasing. Use Value: Enables single-cell Li-ion operation with <±0.5 LSB error across temperature and battery discharge cycle. | Use Scenario: Remote environmental sensors logging temperature/humidity every 10 minutes using coin-cell batteries. IC Role / Device Role / Timing Role: Precision reference for low-power SAR ADC and microcontroller VREF input during wake-up bursts. Use Value: 60µA minimum operating current extends battery life beyond 5 years while maintaining ±0.2% measurement accuracy. |
| Industrial Process Transmitters | Medical Wearable Sensors |
Use Scenario: 4–20mA loop-powered pressure transmitters operating in -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Primary voltage reference for DAC generating loop current setpoint and internal LDO feedback. Use Value: ±100ppm/°C tempco ensures <±0.1% full-scale error over industrial temperature range without software compensation. | Use Scenario: ECG patch devices measuring microvolt-level biopotentials with ultra-low power budget. IC Role / Device Role / Timing Role: Low-noise reference for instrumentation amplifier gain-setting and ADC reference rail. Use Value: 28µVRMS noise prevents degradation of signal-to-noise ratio in sub-1µV resolution analog front-end. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable 1.24V–18V output; 0.5% initial accuracy; higher 80µA min current; SOT23-3 package. | Requires external resistors for 2.048V setting; less accurate and noisier (75µVRMS) than LM4040BIM3-2.1. | Choose when adjustable output or higher voltage capability is needed; avoid if fixed 2.048V and low noise are mandatory. |
| ADR3420ARJZ-R7 | Fixed 2.048V; 0.1% initial accuracy; 3ppm/°C tempco; 100µA–10mA range; SOT23-5 package with enable pin. | Higher accuracy and lower tempco but larger footprint and higher minimum current; requires enable control logic. | Choose for metrology-grade systems needing <±0.05% total error; not suitable for ultra-low-power or space-constrained designs. |
Compared with TLVH431ACDBVR and ADR3420ARJZ-R7, LM4040BIM3-2.1 delivers optimal balance of size (SC70), micropower operation (60µA min), and 0.2% accuracy-making it preferred for compact, battery-operated instrumentation where fixed 2.048V and minimal BOM count are essential.
Availability
LM4040BIM3-2.1 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial process transmitters requiring stable component supply with consistent lead times and RoHS-compliant packaging.
Supply support for LM4040BIM3-2.1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated is a semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and communication applications.
The LM4040 product line delivers precision shunt voltage references optimized for space-constrained, low-power systems including portable medical devices, industrial sensors, and battery-operated instrumentation.
FAQ
What is the exact output voltage tolerance of LM4040BIM3-2.1 at +25°C?
The LM4040BIM3-2.1 has a nominal output voltage of 2.048V with ±4.0mV (±0.2%) initial tolerance at +25°C, as specified in the Electrical Characteristics table for the B-grade variant. This tolerance remains valid across the full -40°C to +85°C operating range when combined with its ±100ppm/°C temperature coefficient.
Does LM4040BIM3-2.1 require an external output capacitor for stability?
No, LM4040BIM3-2.1 does not require an external output capacitor. Its internal design ensures stability with any capacitive load, eliminating the need for external components and simplifying layout-particularly valuable in space-constrained SC70 applications.
What is the minimum operating current for LM4040BIM3-2.1, and why is it important?
The LM4040BIM3-2.1 requires a minimum shunt current of 60µA to maintain regulation. Operating below this threshold risks loss of reference accuracy and increased output impedance, directly impacting measurement fidelity in low-power sensor nodes and sleep-mode circuits.
Can LM4040BIM3-2.1 be used in automotive applications?
LM4040BIM3-2.1 is rated for -40°C to +85°C operation and is not qualified for automotive AEC-Q100 standards. For automotive-grade use, consider the LM4040BEX3-2.1-T variant (rated -40°C to +125°C, SC70 package) or other AEC-Q100-certified shunt references.
How does the noise performance of LM4040BIM3-2.1 compare to other 2.048V references?
LM4040BIM3-2.1 delivers 28µVRMS wideband noise (10Hz–10kHz), significantly lower than alternatives like TLVH431ACDBVR (75µVRMS). This makes LM4040BIM3-2.1 suitable for 16-bit ADC reference applications without added filtering, preserving signal integrity in precision measurement systems.
LM4040BIM3-2.1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 28µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040BIM3-2.1 FAQ
1.How can I place an order for LM4040BIM3-2.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BIM3-2.1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM4040BIM3-2.1 reliable?
The price and inventory of LM4040BIM3-2.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BIM3-2.1 is usually 5 days.
3.What payment methods are accepted for LM4040BIM3-2.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BIM3-2.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BIM3-2.1?
LM4040BIM3-2.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BIM3-2.1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM4040BIM3-2.1?
For technical support, including LM4040BIM3-2.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BIM3-2.1 requirements.
6.How does Aetrix verify that LM4040BIM3-2.1 is sourced from the original manufacturer or authorized distributors?
All LM4040BIM3-2.1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM4040BIM3-2.1 meets industry standards.
7.What is the process for return or replacement of LM4040BIM3-2.1?
All LM4040BIM3-2.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BIM3-2.1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM4040BIM3-2.1 part is unused and in its original packaging.
Return procedure for LM4040BIM3-2.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040BIM3-2.1 Tags
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