My Inquiry
My Account
Analog Devices Inc./Maxim Integrated LM4040BIX3-2.1
- Part No.:
- LM4040BIX3-2.1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040BIX3-2.1.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,307
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4040BIX3-2.1 from Maxim Integrated is a precision 2.048V two-terminal shunt voltage reference in SC70-3 package, featuring ±0.2% initial accuracy, ±15 ppm/°C temperature coefficient over –40°C to +85°C, 60µA–15mA operating current range, and 28µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference in portable battery-powered systems requiring minimal board space and low quiescent current.
For engineers reviewing the LM4040BIX3-2.1 datasheet, LM4040BIX3-2.1 pinout, LM4040BIX3-2.1 application, or LM4040BIX3-2.1 equivalent, key selection criteria include shunt reference stability under varying load currents, compatibility with capacitive loads without external compensation, thermal drift performance in compact industrial sensors, and direct substitution for legacy 2.048V bandgap references in ADC/DAC biasing circuits.
Technical Context
The LM4040BIX3-2.1 implements a laser-trimmed bandgap core in BiCMOS process, delivering fixed 2.048V reverse breakdown voltage with no external capacitor required for stability. Its dynamic impedance is ≤0.8Ω at 1mA, enabling tight regulation across 60µA–15mA shunt current while maintaining <±2.0mV voltage change over full operating current range.
Designed for space-constrained applications, it operates across –40°C to +85°C with guaranteed long-term stability of 120ppm after 1000 hours and tolerates any capacitive load without oscillation-leveraging internal compensation that eliminates output capacitor dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±0.2% initial tolerance (±4.1mV) at +25°C - enables precise 12-bit ADC reference scaling without calibration. |
| Temperature Coefficient | ±15 ppm/°C max over –40°C to +85°C - ensures ≤±1.0mV total drift across full temperature range, critical for sensor front-ends. |
| Operating Current Range | 60µA to 15mA - supports ultra-low-power sleep modes and high-current precision DAC biasing in same design. |
| Dynamic Impedance | ≤0.8Ω at 1mA, 120Hz - minimizes output voltage perturbation during transient load changes in data acquisition systems. |
| Wideband Noise | 28µVRMS (10Hz–10kHz) - meets low-noise requirements for high-resolution analog signal chains and precision instrumentation. |
| Long-Term Stability | 120ppm after 1000 hours - reduces recalibration frequency in industrial monitoring equipment. |
| Package | SC70-3 (1.8mm × 1.8mm) - occupies 50% less area than SOT23-3, enabling dense PCB layouts in handheld medical devices. |
Pinout & Package
LM4040BIX3-2.1 uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm × 0.9mm height), optimized for space-critical applications. Pin 3 is unconnected (N.C.) and must be left floating or tied to Pin 2 per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Anode / Positive terminal | Connects to system ground or low-impedance return path; defines reference node polarity for shunt operation. |
| Pin 2 (−) | Cathode / Negative terminal | Connected to regulated voltage node; sinks shunt current to maintain 2.048V across terminals. |
| Pin 3 (N.C.) | No connection | Must remain unconnected or shorted to Pin 2; no internal functionality - avoids parasitic coupling in high-frequency layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - enables placement in 0402-class board real estate, ideal for wearable biosensors and miniaturized IoT nodes. |
| No output capacitor required | Stable with any capacitive load up to 10µF - eliminates BOM cost and layout risk associated with external stabilization components. |
| Low 28µVRMS noise | 10Hz–10kHz integrated noise floor - preserves SNR in 16-bit+ SAR ADC reference paths without filtering overhead. |
| Wide 60µA–15mA shunt current range | Supports both micropower sensor wake-up states (<100µA) and high-accuracy active measurement phases (>10mA) in single-supply systems. |
| Laser-trimmed initial accuracy | ±0.2% (LM4040B grade) - achieves 12-bit monotonicity without post-assembly trimming, reducing test time in volume production. |
Applications
| Portable Medical Sensors | Notebook Computer Power Monitoring |
|---|---|
|
Use Scenario: Reference voltage for ECG front-end ADC in battery-powered patch monitors. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.048V bias to 16-bit sigma-delta ADC input stage. Use Value: Enables sub-µV input-referred noise performance and <±1 LSB integral nonlinearity over temperature, extending battery life via 60µA minimum operating current. |
Use Scenario: Precision voltage reference for system power rail monitoring in ultrabooks. IC Role / Device Role / Timing Role: Stable 2.048V reference for analog comparator detecting 3.3V/5V rail undervoltage conditions. Use Value: Guarantees ±0.2% trip-point accuracy across –40°C to +85°C ambient, preventing false shutdowns during thermal cycling. |
| Industrial Process Transmitters | Smart Energy Metering Modules |
|
Use Scenario: Reference for 4–20mA loop transmitter DAC in hazardous-area field instruments. IC Role / Device Role / Timing Role: Two-terminal shunt reference sinking current to set DAC full-scale output voltage. Use Value: Maintains 2.048V accuracy despite 15mA loop current variations and 100ppm/°C thermal drift, ensuring <0.1% span error over operating temperature. |
Use Scenario: Calibration reference for polyphase energy meter ICs measuring grid voltage/current harmonics. IC Role / Device Role / Timing Role: Low-noise 2.048V reference for metrology-grade ADC sampling at 8kHz. Use Value: 28µVRMS noise and 120ppm/1000h stability enable Class 0.2 meter certification without periodic recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBZR | Adjustable 1.24V–18V shunt reference; 0.5% initial accuracy; higher 100µA min current; SOT23-3 package. | Requires external resistor network for 2.048V setting; less suitable for space-constrained designs due to added components. | Select when adjustable output or higher voltage capability (up to 18V) is needed; avoid if board area or component count is critical. |
| ADR3420ARJZ-R7 | 2.048V series reference; 0.1% initial accuracy; 3ppm/°C tempco; 100µA–15mA supply current; SOT23-5 package. | Series architecture requires dedicated supply pin and cannot sink current; incompatible with shunt-based biasing topologies. | Choose only for applications needing ultra-low tempco and series topology compatibility; not a drop-in replacement for LM4040BIX3-2.1. |
Compared with TLVH431AIDBZR and ADR3420ARJZ-R7, LM4040BIX3-2.1 offers the smallest footprint, lowest minimum operating current, and true two-terminal simplicity-making it optimal for ultra-compact, battery-sensitive shunt reference implementations where fixed 2.048V output is acceptable.
Availability
LM4040BIX3-2.1 is available at Aetrix Electronics and suitable for portable medical sensors, notebook computer power monitoring, industrial process transmitters, and smart energy metering modules requiring stable component supply with guaranteed long-term availability.
Supply support for LM4040BIX3-2.1 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 (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, automotive, and communications markets, with expertise in low-power, high-accuracy voltage references and sensor interfaces.
The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated systems requiring stable 2.048V–5.000V reference voltages with minimal external components.
FAQ
What is the maximum shunt current rating for LM4040BIX3-2.1?
The absolute maximum reverse current for LM4040BIX3-2.1 is 20mA, but its specified operating range is 60µA to 15mA. Exceeding 15mA risks exceeding power dissipation limits (174mW in SC70-3 at +70°C) and may degrade long-term stability. For reliable operation, keep shunt current ≤15mA under all conditions including worst-case supply voltage and minimum load current.
Can LM4040BIX3-2.1 be used with large output capacitors?
Yes, LM4040BIX3-2.1 is explicitly designed to remain stable with any capacitive load - including ceramic, tantalum, or electrolytic capacitors up to at least 10µF - without requiring external series resistance or compensation. This eliminates output capacitor selection constraints and simplifies layout in noise-sensitive applications like precision data acquisition.
What does the 'B' in LM4040BIX3-2.1 indicate?
The 'B' denotes the initial accuracy grade: ±0.2% (±4.1mV) at +25°C. This corresponds to the LM4040B specification tier, distinct from 'A' (±0.1%), 'C' (±0.5%), and 'D' (±1.0%). The full part number LM4040BIX3-2.1 confirms 2.048V output, SC70-3 package, and B-grade accuracy - verified in the Electrical Characteristics table on page 2 of the datasheet.
How does LM4040BIX3-2.1 handle temperature variation?
LM4040BIX3-2.1 guarantees a maximum temperature coefficient of ±15 ppm/°C over –40°C to +85°C, resulting in ≤±1.0mV total output voltage shift across the full range. Its bandgap architecture ensures monotonic drift behavior, and the ±15 ppm/°C spec applies to all grades (A/B/C/D) except D-grade above +85°C, where tempco rises to ±150 ppm/°C.
Is LM4040BIX3-2.1 compatible with SOT23-3 footprints?
No, LM4040BIX3-2.1 uses the SC70-3 package (1.8mm × 1.8mm), which is physically smaller than SOT23-3 (2.9mm × 1.6mm) and has different pad dimensions and pitch. While both are 3-pin surface-mount packages, direct footprint compatibility is not possible without PCB redesign. For SOT23-3 compatibility, use LM4040BIM3-2.1 instead.
LM4040BIX3-2.1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- 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:
- SC-70-3
LM4040BIX3-2.1 FAQ
1.How can I place an order for LM4040BIX3-2.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BIX3-2.1 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 LM4040BIX3-2.1 reliable?
The price and inventory of LM4040BIX3-2.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BIX3-2.1 is usually 5 days.
3.What payment methods are accepted for LM4040BIX3-2.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BIX3-2.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BIX3-2.1?
LM4040BIX3-2.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BIX3-2.1 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 LM4040BIX3-2.1?
For technical support, including LM4040BIX3-2.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BIX3-2.1 requirements.
6.How does Aetrix verify that LM4040BIX3-2.1 is sourced from the original manufacturer or authorized distributors?
All LM4040BIX3-2.1 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 LM4040BIX3-2.1 meets industry standards.
7.What is the process for return or replacement of LM4040BIX3-2.1?
All LM4040BIX3-2.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BIX3-2.1, 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 LM4040BIX3-2.1 part is unused and in its original packaging.
Return procedure for LM4040BIX3-2.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040BIX3-2.1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
