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Texas Instruments LM4040CIM3-4.1/NOPB
- Part No.:
- LM4040CIM3-4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CIM3-4.1/NOPB.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:371
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Product details
Overview
LM4040CIM3-4.1/NOPB from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a stable 4.096 V reverse breakdown voltage with ±0.5% initial tolerance (C grade), 100 ppm/°C max temperature coefficient, and 35 μVRMS wideband noise (10 Hz–10 kHz). It operates from 68 μA to 15 mA over −40°C to +85°C and requires no output capacitor-used in analog input modules and field transmitters for ADC biasing and sensor excitation.
For engineers reviewing the LM4040CIM3-4.1/NOPB datasheet, LM4040CIM3-4.1/NOPB pinout, LM4040CIM3-4.1/NOPB application, or LM4040CIM3-4.1/NOPB equivalent, key selection criteria include industrial-grade temperature range, low dynamic impedance (0.9 Ω typ), thermal hysteresis (0.08%), long-term stability (120 ppm), and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040CIM3-4.1/NOPB implements a Zener-zap trimmed bandgap-shunt architecture with curvature-corrected temperature drift compensation, enabling stable 4.096 V reference performance across wide current (68 μA–15 mA) and temperature (−40°C to +85°C) ranges. Its fuse-based wafer-sort trimming ensures ±0.5% initial accuracy at 25°C.
Unlike series references, it functions as a two-terminal shunt device: cathode sinks current while anode connects to ground, allowing simple biasing of precision circuits. It tolerates any capacitive load and eliminates need for stabilization capacitors-reducing BOM count and PCB footprint in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal reverse breakdown voltage-matches common 12-bit DAC/ADC full-scale scaling (e.g., 4.096 V = 1 LSB × 4096). |
| Initial Tolerance | ±0.5% at 25°C (C grade)-translates to ±20.5 mV absolute error, sufficient for 10-bit system accuracy without calibration. |
| Temp Coefficient | ≤100 ppm/°C max-adds ≤±8.2 mV error over −40°C to +85°C span, critical for uncalibrated industrial sensing. |
| Operating Current | 68 μA min to 15 mA max-enables ultra-low-power operation in battery-powered sensors and robust sourcing in PLC I/O modules. |
| Noise (10Hz–10kHz) | 35 μVRMS typical-low enough to avoid degrading ENOB in 16-bit SAR ADCs when used as reference source. |
| Dynamic Impedance | 0.9 Ω typical at 1 mA-minimizes load-induced voltage shift during fast current transients in data acquisition front-ends. |
| Thermal Hysteresis | 0.08%-equivalent to ±3.3 mV after thermal cycling, ensuring repeatable accuracy in cyclic environmental exposure. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, surface-mount, JEDEC MO-178 compatible. Thermal resistance RθJA = 291.9°C/W (board-mounted).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current sink / output node | Connected to supply rail via series resistor; regulates voltage by sinking excess current to maintain 4.096 V at this node. |
| Anode (Pin 2) | Reference ground return | Must be connected to system ground; defines 0 V reference point for the shunt's reverse-biased operation. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must float or tie to anode per TI recommendation for EMI immunity in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Enables direct integration into compact layouts without stability-compensation components-reduces design iteration time and bill-of-materials cost. |
| Capacitive load tolerance | Stable with any output capacitance (including ADC input caps or long trace parasitics), eliminating layout-dependent oscillation risk in mixed-signal systems. |
| Zener-zap voltage trim | Wafer-level laser trimming achieves ±0.5% initial accuracy without post-packaging calibration-ensures high yield and consistent performance across lots. |
| Low quiescent current | 68 μA minimum operating current enables use in always-on sensor nodes powered by coin cells or energy harvesters. |
| Bandgap temperature curvature correction | Compensates parabolic drift over temperature, delivering flat 4.096 V output across −40°C to +85°C without external circuitry. |
Applications
| Field Transmitter | Energy Infrastructure |
|---|---|
Use Scenario: 4–20 mA loop-powered pressure/temperature transmitter with integrated signal conditioning and microcontroller. IC Role / Device Role / Timing Role: Shunt reference providing stable 4.096 V excitation for bridge sensors and precise reference for 16-bit ADC converting sensor output. Use Value: Enables <12-bit effective resolution without calibration, supports loop power budget down to 3.3 V supply, and withstands industrial EMI due to NC-pin grounding option. | Use Scenario: Smart meter voltage monitoring channel measuring phase-to-neutral AC voltage via resistive divider. IC Role / Device Role / Timing Role: Precision reference for anti-aliasing filter biasing and ADC reference in Class 0.5 metrology subsystem. Use Value: 100 ppm/°C tempco ensures <0.1% measurement error across outdoor temperature range; 35 μVRMS noise avoids quantization uncertainty in 24-bit sigma-delta converters. |
| Analog Input Module | Automotive ECUs |
Use Scenario: Industrial PLC analog input card accepting ±10 V, 0–20 mA, and thermocouple inputs with shared reference. IC Role / Device Role / Timing Role: Primary voltage reference for multiplexed instrumentation amplifier gain-setting and successive-approximation ADC conversion. Use Value: Low dynamic impedance (0.9 Ω) prevents channel crosstalk during fast multiplexing; SOT-23 package allows dense channel spacing on 4-layer PCB. | Use Scenario: Engine control unit (ECU) measuring throttle position, coolant temperature, and intake air pressure using ratiometric sensors. IC Role / Device Role / Timing Role: Stable 4.096 V reference for MCU internal ADC and external sensor excitation in AEC-Q100 Grade 3 environment. Use Value: Qualified to −40°C to +85°C with 0.08% thermal hysteresis ensures repeatable sensor readings after cold-start/warm-up cycles; ±0.5% tolerance meets ASAM MCD-2 MC calibration requirements. |
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 output, ±0.5% tolerance, SOT-23-3, but higher 100 μA min operating current and 50 μVRMS noise. | Less suitable for ultra-low-power sensor nodes; acceptable in industrial PLCs where noise margin >15 μVRMS exists. | Select TL4050C41IDBZR only if existing design uses TI's TL4050 family for supply-chain consolidation. |
| REF3040AIDBZR | Series reference (not shunt); requires input ≥4.3 V, draws 45 μA quiescent current, ±0.2% initial accuracy, 25 μVRMS noise. | Cannot replace shunt topology directly; needs redesign of bias network and dropout headroom; better for low-noise, low-drift applications with available headroom. | Choose REF3040AIDBZR only when upgrading to lower noise and tighter initial accuracy-and when supply voltage permits ≥4.3 V input. |
Compared with TL4050C41IDBZR, LM4040CIM3-4.1/NOPB offers 32% lower minimum operating current and 30% less noise-critical for battery life and high-resolution measurement. Versus REF3040AIDBZR, it enables simpler, lower-voltage shunt-based designs but trades off absolute accuracy and noise floor.
Availability
LM4040CIM3-4.1/NOPB is available at Aetrix Electronics and suitable for field transmitters, energy infrastructure meters, and analog input modules requiring stable component supply, long-lifecycle support, and automotive-qualified alternatives.
Supply support for LM4040CIM3-4.1/NOPB 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, embedded processing, and connectivity technologies, with decades of expertise in precision reference design.
The LM4040-N product line delivers micropower shunt voltage references optimized for space-constrained, low-cost industrial and automotive systems requiring high initial accuracy, low drift, and robust capacitive-load stability.
FAQ
What is the maximum operating current for LM4040CIM3-4.1/NOPB?
The LM4040CIM3-4.1/NOPB supports a maximum operating current of 15 mA, verified per TI's Electrical Characteristics table 5.15. 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 reliability degradation, especially above 85°C ambient.
Does LM4040CIM3-4.1/NOPB require an external capacitor for stability?
No, LM4040CIM3-4.1/NOPB does not require an external capacitor for stability. Its internal design eliminates the need for output capacitance, and it remains stable with any capacitive load-including ADC input capacitance, PCB trace parasitics, or filtering caps-making it ideal for compact, low-component-count designs.
What is the temperature range specification for LM4040CIM3-4.1/NOPB?
The LM4040CIM3-4.1/NOPB is rated for the industrial temperature range of −40°C to +85°C (Grade I), as confirmed in section 5.3 and table 5.15 of the datasheet. It is not qualified for extended −40°C to +125°C operation-those variants carry "E" suffixes (e.g., LM4040CEM3-4.1).
How does the NC pin (Pin 3) function in LM4040CIM3-4.1/NOPB?
Pin 3 of LM4040CIM3-4.1/NOPB is a no-connect terminal. TI recommends leaving it floating or connecting it to the anode (Pin 2) to improve EMI immunity in high-noise environments such as near switching power supplies or motor drives-this mitigates coupling through internal parasitic capacitance.
What is the typical wideband noise performance of LM4040CIM3-4.1/NOPB?
The LM4040CIM3-4.1/NOPB delivers 35 μVRMS typical wideband noise over 10 Hz to 10 kHz, as specified in tables 5.5–5.15. This value is measured at 100 μA operating current and is independent of grade-C, D, or E variants all share this noise characteristic, making it suitable for 16-bit data acquisition systems.
LM4040CIM3-4.1/NOPB 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:
- Active
- 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
LM4040CIM3-4.1/NOPB FAQ
1.How can I place an order for LM4040CIM3-4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIM3-4.1/NOPB 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 LM4040CIM3-4.1/NOPB reliable?
The price and inventory of LM4040CIM3-4.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIM3-4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4040CIM3-4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIM3-4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIM3-4.1/NOPB?
LM4040CIM3-4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIM3-4.1/NOPB 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 LM4040CIM3-4.1/NOPB?
For technical support, including LM4040CIM3-4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIM3-4.1/NOPB requirements.
6.How does Aetrix verify that LM4040CIM3-4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4040CIM3-4.1/NOPB 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 LM4040CIM3-4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4040CIM3-4.1/NOPB?
All LM4040CIM3-4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIM3-4.1/NOPB, 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 LM4040CIM3-4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4040CIM3-4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CIM3-4.1/NOPB Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-4.1-TR
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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