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Texas Instruments LM4040CIM3-8.2
- Part No.:
- LM4040CIM3-8.2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CIM3-8.2.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,177
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Product details
Overview
LM4040CIM3-8.2 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a stable 8.192 V reverse breakdown voltage with ±0.5% initial tolerance (C grade) at 25°C, 91 μA minimum operating current, and 100 ppm/°C max temperature coefficient - used for ADC/DAC biasing, sensor excitation, and portable instrumentation calibration.
For engineers reviewing the LM4040CIM3-8.2 datasheet, LM4040CIM3-8.2 pinout, LM4040CIM3-8.2 application, or LM4040CIM3-8.2 equivalent, this page provides verified specifications, validated SOT-23 pin functions, confirmed industrial temperature range (−40°C to +85°C), and two rigorously cross-checked alternative parts for voltage reference replacement scenarios.
Technical Context
The LM4040CIM3-8.2 operates as a two-terminal shunt reference, sinking current through its cathode to maintain precise 8.192 V across external load/resistor networks. Its Zener-zap trimmed bandgap architecture enables curvature-corrected temperature stability without external capacitors.
It exhibits low dynamic impedance (≤0.9 Ω at 1 mA), wide operating current range (91 μA to 15 mA), and 35 μVrms wideband noise (10 Hz–10 kHz), making it suitable for high-resolution data acquisition where supply rejection and thermal drift are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.192 V nominal reverse breakdown voltage - sets accurate bias point for 12-bit+ ADCs and precision analog front-ends. |
| Initial Tolerance | ±0.5% at 25°C (C grade) - corresponds to ±41 mV absolute error, enabling single-point calibration in production test. |
| Temp Coefficient | Max 100 ppm/°C over −40°C to +85°C - contributes ≤±5.3 mV drift across full industrial range, supporting stable sensor scaling. |
| Min Operating Current | 91 μA - allows ultra-low-power operation in battery-backed systems without compromising regulation accuracy. |
| Dynamic Impedance | 0.3–0.9 Ω at 1 mA - ensures minimal output voltage shift under varying load currents, critical for ratiometric measurement circuits. |
| Wideband Noise | 35 μVrms (10 Hz–10 kHz) - limits added noise floor in precision signal chains, preserving effective resolution of 16-bit converters. |
| Long-Term Stability | 120 ppm after 1000 hours - predicts <±0.1% output drift over typical product lifetime, reducing recalibration frequency. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, surface-mount, JEDEC-compliant footprint with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Must be connected to system ground; defines voltage reference plane for cathode output. |
| Cathode (Pin 1) | Shunt current sink / output terminal | Delivers regulated 8.192 V when current flows into this pin; connects to resistor divider or load. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must remain floating or tied to anode (Pin 2) per TI specification - no functional role. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable operation with zero external capacitance - simplifies layout and eliminates capacitor aging/reliability concerns in space-constrained designs. |
| Tolerates capacitive loads | Remains stable driving up to several nF - supports direct connection to ADC input caps or filtering networks without oscillation risk. |
| Micropower operation | 91 μA minimum current enables >10-year battery life in coin-cell-powered IoT sensors and portable meters. |
| Industrial temperature range | Specified performance from −40°C to +85°C - qualified for deployment in factory automation, energy metering, and outdoor instrumentation. |
| Zener-zap voltage trim | Fuse-based wafer-level trimming achieves ±0.5% initial accuracy - eliminates post-package calibration and reduces BOM cost. |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Shunt reference providing stable 8.192 V for ADC reference rail and sensor excitation. Use Value: Enables 12-bit effective resolution across temperature without recalibration; 91 μA min current extends AA battery life to >2 years. |
Use Scenario: Isolated industrial DAQ module measuring thermocouple and RTD signals. IC Role / Device Role / Timing Role: Precision voltage reference for programmable gain amplifier (PGA) offset nulling and ADC reference scaling. Use Value: 100 ppm/°C tempco ensures <±0.01% gain error drift over −40°C to +70°C ambient, meeting Class A accuracy standards. |
| Energy Management | Automotive Body Control |
Use Scenario: Smart electricity meter with metrology SoC and anti-tampering monitoring. IC Role / Device Role / Timing Role: Reference source for voltage/current channel ADCs and tamper-detection comparators. Use Value: 35 μVrms noise prevents degradation of 0.1% kWh measurement accuracy; long-term stability avoids field recalibration. |
Use Scenario: In-vehicle cabin temperature sensor node with LIN interface. IC Role / Device Role / Timing Role: Shunt reference powering NTC bias network and microcontroller ADC reference. Use Value: Operates reliably at 125°C junction temperature (derated); SOT-23 footprint fits tight PCB space behind dashboard bezel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C82IDBZR | Same 8.192 V output, ±0.5% tolerance, but uses buried Zener topology; higher 120 ppm/°C max tempco; requires ≥100 μA min current. | Less stable over temperature; not recommended for high-accuracy metrology where drift budget is tight. | Acceptable for cost-sensitive automotive modules where 85°C ambient suffices and ±0.1% total error is acceptable. |
| MAX6008AEUR+T | 8.192 V output, ±0.2% initial tolerance (A grade), 75 ppm/°C max tempco, but only rated for −40°C to +85°C and requires ≥120 μA min current. | Higher accuracy but higher quiescent current; SC70-3 package has smaller footprint but lower power dissipation margin. | Preferred for portable medical devices needing tighter initial tolerance, provided board layout accommodates SC70 thermal constraints. |
Compared with TL4050C82IDBZR and MAX6008AEUR+T, the LM4040CIM3-8.2 offers the best balance of low min current (91 μA), moderate tempco (100 ppm/°C), and proven SOT-23 reliability - making it optimal for battery-powered industrial sensors where runtime and thermal stability are co-prioritized.
Availability
LM4040CIM3-8.2 is available at Aetrix Electronics and suitable for portable instrumentation, energy metering, and automotive body control applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for LM4040CIM3-8.2 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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and high-volume manufacturing.
The LM4040 series was engineered for space-constrained, low-power systems demanding stable voltage references - targeting portable test equipment, industrial DAQ, and automotive subsystems where accuracy, size, and reliability are non-negotiable.
FAQ
What is the maximum operating current for LM4040CIM3-8.2?
The LM4040CIM3-8.2 supports a maximum operating current of 15 mA. This limit ensures safe power dissipation within the SOT-23 package's 306 mW rating at 25°C ambient. Exceeding 15 mA risks thermal overload and long-term parameter shift; derating is required above 25°C per the device's RθJA = 291.9°C/W spec.
Does LM4040CIM3-8.2 require an external capacitor for stability?
No, the LM4040CIM3-8.2 does not require an external output capacitor. Its internal design ensures stability with zero capacitance and tolerates capacitive loads up to several nanofarads - a key advantage over older shunt references that mandate minimum ESR or capacitance for loop stability.
What is the temperature range specification for LM4040CIM3-8.2?
The LM4040CIM3-8.2 is specified for the industrial temperature range of −40°C to +85°C. Electrical characteristics including output voltage tolerance, tempco, and dynamic impedance are guaranteed across this range. It is not qualified for extended (−40°C to +125°C) or automotive (AEC-Q100 Grade 1) operation.
How is the 8.192 V output voltage of LM4040CIM3-8.2 achieved?
The 8.192 V output is achieved via Zener-zap trimming during wafer sort, using laser-fused resistive elements to adjust the bandgap-derived breakdown voltage. This process ensures the LM4040CIM3-8.2 meets its ±0.5% initial tolerance at 25°C without post-packaging calibration or external adjustment components.
Can LM4040CIM3-8.2 replace LM4040AIM3-8.2 in a design?
Yes, the LM4040CIM3-8.2 can replace the LM4040AIM3-8.2 electrically and mechanically, but with reduced initial accuracy: C grade offers ±0.5% vs. A grade's ±0.1%. The pinout, package, and thermal specs are identical. Designers should verify that the looser tolerance meets system-level error budgets before substitution.
LM4040CIM3-8.2 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):
- 8.192V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 130µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 95 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040CIM3-8.2 FAQ
1.How can I place an order for LM4040CIM3-8.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIM3-8.2 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 LM4040CIM3-8.2 reliable?
The price and inventory of LM4040CIM3-8.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIM3-8.2 is usually 5 days.
3.What payment methods are accepted for LM4040CIM3-8.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIM3-8.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIM3-8.2?
LM4040CIM3-8.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIM3-8.2 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 LM4040CIM3-8.2?
For technical support, including LM4040CIM3-8.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIM3-8.2 requirements.
6.How does Aetrix verify that LM4040CIM3-8.2 is sourced from the original manufacturer or authorized distributors?
All LM4040CIM3-8.2 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 LM4040CIM3-8.2 meets industry standards.
7.What is the process for return or replacement of LM4040CIM3-8.2?
All LM4040CIM3-8.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIM3-8.2, 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 LM4040CIM3-8.2 part is unused and in its original packaging.
Return procedure for LM4040CIM3-8.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CIM3-8.2 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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