My Inquiry
My Account
Analog Devices Inc./Maxim Integrated LM4040AIX3-2.1+T
- Part No.:
- LM4040AIX3-2.1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040AIX3-2.1+T.pdf
- Description:
- IC VREF SHUNT 2.048V SC70
- Quantity:
- Payment:
- Shipping:
Inventory:2,120
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4040AIX3-2.1+T from Maxim Integrated is a precision 2.048V, 0.1% initial accuracy, 100ppm/°C temperature coefficient shunt voltage reference in a 3-pin SC70 package (1.8mm × 1.8mm). It operates over -40°C to +85°C with 60μA–15mA shunt current capability, low 28μVRMS noise (10Hz–10kHz), and no external capacitor requirement-ideal for space-constrained battery-powered analog signal chains and ADC reference circuits.
For engineers reviewing the LM4040AIX3-2.1+T datasheet, LM4040AIX3-2.1+T pinout, LM4040AIX3-2.1+T application, or LM4040AIX3-2.1+T equivalent, key selection criteria include guaranteed ±2.0mV reverse breakdown tolerance at +25°C, SC70 thermal resistance (340°C/W on four-layer board), A-grade accuracy across industrial temperature range, and compatibility with capacitive loads without instability.
Technical Context
The LM4040AIX3-2.1+T uses laser-trimmed bandgap circuitry to deliver stable 2.048V reverse breakdown voltage with minimal drift. Its two-terminal shunt architecture sinks current through an internal pass transistor, enabling regulation without series pass elements or external compensation.
It maintains <0.8Ω dynamic impedance at 1mA, supports operation from 60μA minimum shunt current up to 15mA, and exhibits ±15ppm/°C typical temperature coefficient-guaranteed ≤100ppm/°C over full temperature range. No output capacitor is required for stability, even with arbitrary capacitive loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; ±2.0mV tolerance at +25°C ensures precise ADC/DAC reference alignment |
| Initial Accuracy | 0.1% (Grade A); enables high-resolution measurement systems without calibration |
| Temp Coefficient | ≤100ppm/°C; limits voltage drift to ±8.2mV over -40°C to +85°C operating range |
| Shunt Current Range | 60μA to 15mA; supports ultra-low-power sensor nodes and high-current reference buffering |
| Dynamic Impedance | ≤0.8Ω at 1mA; minimizes load-induced voltage variation in precision feedback loops |
| Output Noise | 28μVRMS (10Hz–10kHz); preserves SNR in 16-bit+ data acquisition systems |
| Operating Temp | -40°C to +85°C; qualified for industrial and automotive cabin electronics |
Pinout & Package
The LM4040AIX3-2.1+T is housed in a RoHS-compliant 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 | Reverse-biased terminal; connects to regulated supply rail via series resistor |
| 2 (–) | Cathode / Reference Output | Stable 2.048V reference node; sinks shunt current to maintain voltage |
| 3 (N.C.) | No Connection | Must remain floating or connected to pin 2; no internal function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70 footprint | 1.8mm × 1.8mm area saves PCB real estate in portable and wearable designs |
| No output capacitor needed | Guaranteed stability with any capacitive load eliminates BOM cost and layout risk |
| Low wideband noise | 28μVRMS enables use in high-SNR applications like precision instrumentation amplifiers |
| Wide shunt current range | 60μA–15mA operation supports both micropower sensors and high-drive reference buffers |
| Laser-trimmed accuracy | 0.1% initial tolerance reduces system-level calibration burden in production test |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered ECG front-end with 24-bit sigma-delta ADC requiring stable reference under varying load and temperature. IC Role / Device Role / Timing Role: Shunt voltage reference providing 2.048V reference for ADC and analog front-end gain stages. Use Value: 0.1% accuracy and 100ppm/°C tempco ensure <±0.5 LSB error over full operating range without recalibration. | Use Scenario: Modular PLC I/O module measuring 4–20mA loop signals with isolated ADCs. IC Role / Device Role / Timing Role: Precision shunt reference for current-to-voltage conversion and ADC reference in isolated analog input channels. Use Value: Stable 2.048V output enables direct mapping to 0–5V full-scale ADC range with minimal gain error. |
| Automotive Cabin Electronics | Wireless Sensor Nodes |
Use Scenario: HVAC control unit monitoring thermistor-based temperature sensors in vehicle cabin. IC Role / Device Role / Timing Role: Reference source for ratiometric thermistor measurement using microcontroller's internal ADC. Use Value: -40°C to +85°C rating and low drift ensure consistent sensor accuracy across ambient extremes. | Use Scenario: LoRaWAN soil moisture sensor node powered by coin cell, operating intermittently for years. IC Role / Device Role / Timing Role: Micropower shunt reference enabling accurate ADC readings during brief active periods. Use Value: 60μA minimum operating current allows reliable startup and regulation even at end-of-battery life. |
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 output; 0.5% initial accuracy; higher 300ppm/°C tempco; SOT23-3 package | Requires external resistors for 2.048V setting; less stable over temperature than LM4040AIX3-2.1+T | Select when adjustable output or higher voltage capability is needed; not drop-in for fixed 2.048V use |
| MAX6002AEUR+T | Fixed 2.048V; 0.1% accuracy; 50ppm/°C tempco; SC70-3 package; lower 12μVRMS noise | Superior tempco and noise performance but limited to +85°C max operating temperature | Prefer for high-precision, low-noise applications within commercial temperature range |
Compared with TLVH431AIDBZR and MAX6002AEUR+T, the LM4040AIX3-2.1+T offers the best balance of A-grade accuracy, industrial temperature range, and SC70 size-making it optimal for fixed 2.048V references where board space and thermal robustness are critical.
Availability
LM4040AIX3-2.1+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition modules, automotive cabin electronics, and wireless sensor nodes requiring stable component supply and long-term design continuity.
Supply support for LM4040AIX3-2.1+T 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 demanding industrial, automotive, and communications applications.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained, battery-operated, and high-reliability systems requiring stable reference voltages without external components.
FAQ
What is the exact reverse breakdown voltage specification for LM4040AIX3-2.1+T at +25°C?
The LM4040AIX3-2.1+T has a nominal reverse breakdown voltage of 2.048V at +25°C, with a guaranteed tolerance of ±2.0mV (min 2.046V, max 2.050V). This tight tolerance is specified for Grade A devices and confirmed in the Electrical Characteristics table for the 2.048V variant. The "2.1" in the part number denotes the 2.048V output, not 2.100V.
Does LM4040AIX3-2.1+T require an external capacitor for stability?
No, the LM4040AIX3-2.1+T does not require an external output capacitor and remains stable with any capacitive load. This is explicitly stated in the General Description and Applications Information sections. Its internal design eliminates the need for external compensation, reducing BOM count and layout complexity compared to many other shunt references.
What is the minimum operating shunt current for LM4040AIX3-2.1+T?
The LM4040AIX3-2.1+T requires a minimum shunt current of 65μA (max) at +25°C, with 45μA (min) guaranteed across the full -40°C to +85°C temperature range. This value is specified in the Electrical Characteristics table under "Minimum Operating Current (IRMIN)" for LM4040A grade devices with 2.048V output.
Is LM4040AIX3-2.1+T RoHS-compliant and lead-free?
Yes, the "+T" suffix in LM4040AIX3-2.1+T indicates a lead(Pb)-free/RoHS-compliant package, as confirmed in the Ordering Information section. The device uses a green, halogen-free molding compound and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements for reflow soldering at +260°C.
How does the temperature coefficient of LM4040AIX3-2.1+T affect its output over -40°C to +85°C?
With a maximum temperature coefficient of 100ppm/°C, the LM4040AIX3-2.1+T exhibits ≤±0.82mV total drift over its full operating range (ΔT = 125°C). At 2.048V, this equates to a worst-case deviation of ±0.04%-well within the 0.1% initial accuracy budget and suitable for 12-bit to 14-bit system accuracy requirements.
LM4040AIX3-2.1+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- 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
LM4040AIX3-2.1+T FAQ
1.How can I place an order for LM4040AIX3-2.1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AIX3-2.1+T 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 LM4040AIX3-2.1+T reliable?
The price and inventory of LM4040AIX3-2.1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AIX3-2.1+T is usually 5 days.
3.What payment methods are accepted for LM4040AIX3-2.1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AIX3-2.1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AIX3-2.1+T?
LM4040AIX3-2.1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AIX3-2.1+T 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 LM4040AIX3-2.1+T?
For technical support, including LM4040AIX3-2.1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AIX3-2.1+T requirements.
6.How does Aetrix verify that LM4040AIX3-2.1+T is sourced from the original manufacturer or authorized distributors?
All LM4040AIX3-2.1+T 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 LM4040AIX3-2.1+T meets industry standards.
7.What is the process for return or replacement of LM4040AIX3-2.1+T?
All LM4040AIX3-2.1+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AIX3-2.1+T, 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 LM4040AIX3-2.1+T part is unused and in its original packaging.
Return procedure for LM4040AIX3-2.1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040AIX3-2.1+T 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…
