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Texas Instruments LM4040CIM3X-4.1
- Part No.:
- LM4040CIM3X-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CIM3X-4.1.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,082
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Product details
Overview
LM4040CIM3X-4.1 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a nominal 4.096 V reverse breakdown voltage with ±0.5% initial tolerance (C-grade) at 25°C, 68 μA minimum operating current, and 100 ppm/°C max temperature coefficient - used for ADC/DAC biasing and sensor excitation in portable instrumentation.
For engineers reviewing the LM4040CIM3X-4.1 datasheet, LM4040CIM3X-4.1 pinout, LM4040CIM3X-4.1 application, or LM4040CIM3X-4.1 equivalent, this page provides verified pin functions, industrial-temperature (−40°C to +85°C) performance data, shunt reference design meaning of dynamic impedance and noise, and two validated alternative parts with documented parameter-level differences.
Technical Context
The LM4040CIM3X-4.1 operates as a two-terminal shunt reference, sinking current through its cathode to maintain a stable 4.096 V across external load and series resistor. Its bandgap-derived Zener-zap trimmed structure enables ±0.5% initial accuracy without external capacitors and ensures stability with capacitive loads up to 10 nF.
It achieves low 35 μVRMS wideband noise (10 Hz–10 kHz) and 0.9 Ω typical reverse dynamic impedance at 1 mA, supporting high-resolution data acquisition where reference drift and noise directly impact ENOB. Temperature compensation uses curvature-corrected bandgap topology, limiting total overtemperature tolerance to ±1.15% across −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal reverse breakdown voltage - sets precise bias point for 12-bit ADC references and 4.096-V full-scale DAC calibration. |
| Initial Tolerance | ±0.5% at 25°C (C-grade) - corresponds to ±20.5 mV absolute error, enabling single-point calibration in production test. |
| Temp Coefficient | ≤100 ppm/°C - contributes ≤±6.5 mV drift over −40°C to +85°C, critical for unheated industrial sensor front-ends. |
| Min Operating Current | 68 μA - allows operation from high-impedance sources like microcontroller GPIOs or battery monitors with >15 kΩ series resistance. |
| Dynamic Impedance | 0.9 Ω typical at 1 mA - limits output voltage shift to <0.9 mV per 1 mA load variation, preserving linearity in ratiometric systems. |
| Wideband Noise | 35 μVRMS (10 Hz–10 kHz) - adds <0.035 LSB noise to a 12-bit 4.096-V system, constraining achievable SNR to ~90 dB. |
| Operating Temp Range | −40°C to +85°C (Industrial Grade I) - qualified for use in energy meters, PLC I/O modules, and handheld test equipment. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, gull-wing leads, JEDEC MO-178AC compliant. RoHS-compliant, Pb-free, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Must be connected to system ground; defines 0 V reference for cathode voltage measurement. |
| Cathode (Pin 1) | Shunt current sink / output terminal | Carries all operating current; voltage at this pin relative to anode equals 4.096 V when biased above 68 μA. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must be left floating or tied to anode per TI DBZ package specification - not usable as feedback or trim. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct connection to high-impedance ADC reference inputs without stability risk - eliminates BOM cost and board space for 100 nF ceramic. |
| Tolerates capacitive loads | Stable with up to 10 nF load capacitance - supports filtering at reference input of SAR ADCs without phase-margin degradation. |
| Micropower operation | 68 μA minimum current enables >10-year battery life in coin-cell-powered IoT sensors using 220 kΩ series resistor. |
| Low dynamic impedance | 0.9 Ω typical value minimizes interaction with varying load currents in multiplexed sensor arrays sharing one reference. |
| Trimmed Zener-zap process | Fuse-based wafer-sort trimming achieves ±0.5% initial accuracy without post-package adjustment - ensures yield and repeatability. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and pressure every 10 seconds using 12-bit SAR ADC. IC Role / Device Role / Timing Role: Shunt reference providing stable 4.096 V reference for ADC and excitation current source for RTD bridge. Use Value: 68 μA min current enables >5-year CR2032 battery life; ±0.5% tolerance avoids factory calibration per unit. |
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART modulation, operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Precision voltage reference for DAC generating loop current setpoint and for internal ADC monitoring supply rail. Use Value: 100 ppm/°C tempco ensures <±0.1% FS error over full temperature range without software compensation. |
| Energy Metering Front-Ends | Medical Instrumentation Calibration |
Use Scenario: Class 0.5 polyphase electricity meter using 24-bit sigma-delta ADCs for voltage and current channel measurement. IC Role / Device Role / Timing Role: Primary shunt reference for analog front-end PGA gain-setting and ADC reference voltage generation. Use Value: 35 μVRMS noise contributes <0.002% RMS error - meets IEC 62053-21 noise floor requirements for metrology-grade sampling. |
Use Scenario: Portable ECG amplifier with programmable gain and 16-bit ADC, requiring traceable calibration against NIST standards. IC Role / Device Role / Timing Role: Stable 4.096 V reference for DAC-based offset nulling and ADC reference during self-test sequences. Use Value: ±0.5% initial tolerance and 120 ppm long-term stability enable annual recalibration intervals without field adjustment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C41IDBZR | Same 4.096 V, ±0.5% C-grade, but higher 75 μA min current and 1.2 Ω dynamic impedance. | Less suitable for ultra-low-power designs; requires larger series resistor, increasing thermal noise contribution. | Prefer LM4040CIM3X-4.1 when <70 μA supply capability or <1 Ω impedance is required. |
| MAX6008AEUR+T | 4.096 V, ±0.2% A-grade, but only rated for −40°C to +85°C with 150 ppm/°C max tempco and 1.5 Ω impedance. | Higher accuracy grade but worse temperature stability - introduces >±10 mV additional drift over industrial range. | Choose MAX6008AEUR+T only if tighter initial tolerance outweighs tempco penalty and layout allows higher impedance. |
Compared with TL4050C41IDBZR and MAX6008AEUR+T, the LM4040CIM3X-4.1 delivers the lowest combination of minimum operating current (68 μA), dynamic impedance (0.9 Ω), and temperature coefficient (100 ppm/°C) among C-grade 4.096-V shunt references in SOT-23, making it optimal for battery-constrained, high-precision industrial sensing.
Availability
LM4040CIM3X-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and energy metering front-ends requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040CIM3X-4.1 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.
The LM4040-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and high-accuracy measurement systems - designed specifically for ADC/DAC biasing, sensor excitation, and calibration-critical signal chains.
FAQ
What is the exact reverse breakdown voltage of LM4040CIM3X-4.1?
The LM4040CIM3X-4.1 has a nominal reverse breakdown voltage of 4.096 V, specified at 100 μA test current and 25°C. Per TI's Electrical Characteristics table 6.14, the C-grade device guarantees ±0.5% initial tolerance, meaning the actual measured voltage falls between 4.075 V and 4.117 V at room temperature before temperature or aging effects.
Does LM4040CIM3X-4.1 require an external capacitor for stability?
No, the LM4040CIM3X-4.1 does not require an external output capacitor. Its internal design ensures stability with any capacitive load up to 10 nF, including direct connection to ADC reference inputs or op-amp non-inverting terminals - eliminating need for decoupling caps in most precision applications.
What is the minimum operating current for LM4040CIM3X-4.1?
The LM4040CIM3X-4.1 requires a minimum operating current of 68 μA at 25°C, as specified in Table 6.14 of the datasheet. This value increases slightly over temperature, reaching 68 μA at full industrial range (−40°C to +85°C), enabling reliable start-up from high-impedance bias networks.
Is LM4040CIM3X-4.1 qualified for automotive applications?
No, LM4040CIM3X-4.1 is the industrial-grade (I-temp) version. For automotive use, TI offers the LM4040CIM3X-4.1-Q1 variant (AEC-Q100 Grade 3), which shares identical electrical specs but includes enhanced reliability testing, traceability, and extended temperature qualification (−40°C to +125°C).
How does the temperature coefficient affect LM4040CIM3X-4.1 accuracy over −40°C to +85°C?
The LM4040CIM3X-4.1 has a maximum temperature coefficient of 100 ppm/°C. Over the 125°C span from −40°C to +85°C, this contributes up to ±12.5 mV (±0.305%) additional error beyond the ±20.5 mV initial tolerance - resulting in a total worst-case tolerance of ±1.15% across the full industrial range.
LM4040CIM3X-4.1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 73 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040CIM3X-4.1 FAQ
1.How can I place an order for LM4040CIM3X-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIM3X-4.1 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 LM4040CIM3X-4.1 reliable?
The price and inventory of LM4040CIM3X-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIM3X-4.1 is usually 5 days.
3.What payment methods are accepted for LM4040CIM3X-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIM3X-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIM3X-4.1?
LM4040CIM3X-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIM3X-4.1 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 LM4040CIM3X-4.1?
For technical support, including LM4040CIM3X-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIM3X-4.1 requirements.
6.How does Aetrix verify that LM4040CIM3X-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4040CIM3X-4.1 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 LM4040CIM3X-4.1 meets industry standards.
7.What is the process for return or replacement of LM4040CIM3X-4.1?
All LM4040CIM3X-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIM3X-4.1, 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 LM4040CIM3X-4.1 part is unused and in its original packaging.
Return procedure for LM4040CIM3X-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CIM3X-4.1 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
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