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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage ReferenceLM4040C30QDBZT
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LM4040C30QDBZT - Texas Instruments

Manufacturer Part Number
LM4040C30QDBZT
Manufacturer
Texas Instruments
Allelco Part Number
32D-LM4040C30QDBZT
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
32,513 pcs available, New & Original
Parts Description
IC VREF SHUNT 0.5% SOT23-3
Package
SOT-23-3
Data sheet
LM4040C30QDBZT.pdf

PCN Design/Specification

LM404xx 07/Mar/2023.pdf

PCN Assembly/Origin

Qual of NFME 17/Feb/2017.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 32513
  • Unit Price: $4.19
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $4.19 $4.19
10+ $4.009 $40.09
30+ $3.899 $116.97
100+ $3.807 $380.70
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

LM4040C30QDBZT Tech Specifications
Texas Instruments - LM4040C30QDBZT technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - LM4040C30QDBZT

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Output (Min/Fixed) 3V
Voltage - Input -
Tolerance ±0.5%
Temperature Coefficient 100ppm/°C
Supplier Device Package SOT-23-3
Series -
Reference Type Shunt
Package / Case TO-236-3, SC-59, SOT-23-3
Package Tape & Reel (TR)
Product Attribute Attribute Value
Output Type Fixed
Operating Temperature -40°C ~ 125°C (TA)
Noise - 10Hz to 10kHz 35µVrms
Noise - 0.1Hz to 10Hz -
Mounting Type Surface Mount
Current - Supply -
Current - Output 15 mA
Current - Cathode 82 µA
Base Product Number LM4040

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

LM4040C30QDBZT Image
LM4040C30QDBZT (1)

Manufacturer Part Number

LM4040C30QDBZT

Manufacturer

Texas Instruments

Introduction

LM4040C30QDBZT is a precision voltage reference source suitable for power management applications.

Product Features and Performance

Fixed 3V output voltage

Shunt reference type

15 mA current output capacity

±0.5% output voltage tolerance

Temperature coefficient at 100ppm/°C

Low noise performance at 35µVrms from 10Hz to 10kHz

Operates reliably from -40°C to 125°C

Product Advantages

High precision voltage output for stable reference

Low temperature coefficient enhances performance across a wide temperature range

Low operational noise suitable for sensitive applications

Key Technical Parameters

Reference Type: Shunt

Output Type: Fixed

Voltage - Output (Min/Fixed): 3V

Current - Output: 15 mA

Tolerance: ±0.5%

Temperature Coefficient: 100ppm/°C

Noise - 10Hz to 10kHz: 35µVrms

Current - Cathode: 82 µA

Operating Temperature: -40°C ~ 125°C

Quality and Safety Features

Built to high Texas Instruments standards

Consistent performance across temperature and load variations

Compatibility

Suitable for surface mount technology with SOT-23-3 package

Compatible with a wide range of power management circuits

Application Areas

Sensitive electronics requiring stable voltage references

Power supply controls

Data acquisition systems

Portable and battery-powered equipment

Automotive electronics

Product Lifecycle

Active product status

Not nearing discontinuation at the knowledge cutoff date

Replacements and upgrades should be available through Texas Instruments

Several Key Reasons to Choose This Product

High precision and low tolerance for reliable performance

Able to operate in a wide range of temperatures from -40°C to 125°C

Low output noise advantageous for noise-sensitive applications

Texas Instruments quality assurance for safety and longevity

The compact SOT-23-3 package allows for easy integration into a variety of designs

Fully characterized temperature coefficients and parameter limits for ease of design

Offers a high-quality solution for establishing a stable reference voltage in various applications

Frequently Asked Questions(FAQ)

What are the key design considerations when using the LM4040C30QDBZT in a precision analog front-end circuit operating over a wide temperature range?
The LM4040C30QDBZT offers a fixed 3V output with ±0.5% initial accuracy and a temperature coefficient of 100 ppm/°C, making it suitable for moderate-precision applications across its full operating range of -40°C to 125°C. When designing over this span, engineers should account for a potential output drift of up to 30 mV due to temperature variation alone. This drift must be evaluated against system-level accuracy requirements, especially in signal conditioning paths where gain stages amplify reference errors. The device’s low cathode current of 82 µA enables operation in low-power modes, but stability must be verified with bypass capacitance, as the shunt architecture can be sensitive to capacitive loading.
How does the LM4040C30QDBZT compare to series voltage references in terms of power efficiency and board space for battery-powered sensor nodes?
Unlike series references that require input and output capacitors and draw supply current continuously, the LM4040C30QDBZT is a shunt reference that only draws current when biased through an external resistor. This allows dynamic current scaling based on load demand, improving efficiency in intermittent-use sensor nodes. However, it requires a precision current-limiting resistor and cannot regulate without a pull-up voltage source. In space-constrained designs, the SOT-23-3 package provides a compact footprint, but the need for an external resistor may offset space savings compared to integrated series references like the REF3030.
Can the LM4040C30QDBZT be used in a multi-channel data acquisition system where multiple ADCs share a common voltage reference?
While technically feasible, sharing the LM4040C30QDBZT across multiple ADCs introduces risks related to load regulation and noise coupling. The device supports up to 15 mA of cathode current, which may suffice for several high-impedance ADC reference inputs, but any dynamic current draw from one channel can modulate the reference voltage seen by others due to finite output impedance. For systems requiring channel-to-channel isolation or high SNR, individual buffering or dedicated references per ADC are preferable. If shared, a low-output-impedance buffer amplifier should follow the LM4040C30QDBZT to maintain stability and minimize crosstalk.
What is the impact of long-term drift on the LM4040C30QDBZT’s performance in industrial control systems with 10-year operational lifespans?
The LM4040C30QDBZT datasheet does not specify long-term drift (LTD), a critical parameter for decade-scale deployments. While the initial tolerance is ±0.5%, aging effects—particularly in plastic-packaged devices—can introduce additional drift of 100–500 ppm over time due to package stress and material migration. In industrial environments with thermal cycling, this could result in cumulative errors exceeding 1% over ten years. For such applications, consider devices with characterized LTD or implement periodic calibration routines to compensate for drift.
How should the LM4040C30QDBZT be biased in a 5V system to ensure stable operation while minimizing power dissipation?
In a 5V system, the LM4040C30QDBZT requires a series resistor to limit cathode current. Using a 133 Ω resistor (e.g., standard 130 Ω or 150 Ω) results in approximately 15 mA of cathode current ((5V – 3V) / 133 Ω), aligning with the maximum recommended current. This configuration ensures headroom for load variations while keeping power dissipation in the resistor at around 30 mW. Lower resistor values increase current and improve transient response but raise power loss; higher values reduce current but may compromise noise performance and regulation under load.
What noise performance can be expected from the LM4040C30QDBZT in a 16-bit data acquisition system sampling at 1 kSPS?
The LM4040C30QDBZT exhibits 35 µVrms noise from 10 Hz to 10 kHz, which translates to approximately 210 µVpp assuming Gaussian distribution. For a 3V reference, this represents about 70 ppm of noise—significant in 16-bit systems where 1 LSB corresponds to ~45.8 µV. Without additional filtering, the reference noise may dominate the system’s effective resolution. Implementing a low-pass RC filter at the output (e.g., 1 kΩ and 10 µF) can reduce broadband noise but must be evaluated for startup time and stability with capacitive loads.
Is the LM4040C30QDBZT suitable for use in automotive under-hood applications given its operating temperature range?
With an operating temperature range of -40°C to 125°C, the LM4040C30QDBZT meets the thermal requirements for many automotive under-hood environments, particularly those not exceeding 125°C ambient. However, automotive qualification (e.g., AEC-Q100) is not explicitly stated in the provided data, and the base LM4040 series includes both commercial and automotive-grade variants. Designers should verify the specific qualification status of the LM4040C30QDBZT with Texas Instruments, as non-automotive parts may lack required reliability testing for mission-critical vehicle systems.
How does the LM4040C30QDBZT behave during power-up and power-down transients in a microcontroller-based system?
As a shunt reference, the LM4040C30QDBZT does not actively regulate during supply transitions. Its output follows the applied bias voltage through the current-limiting resistor, meaning it can exhibit overshoot or slow settling depending on the upstream supply ramp rate and any bypass capacitance. In microcontroller systems, this may cause temporary reference instability during brownouts or hot-swapping events. Adding a small ceramic capacitor (100 nF to 1 µF) close to the cathode improves transient response, but values above 10 µF may cause instability due to the device’s internal feedback dynamics.
Can the LM4040C30QDBZT replace a bandgap reference in a low-cost industrial transmitter design?
The LM4040C30QDBZT can serve as a cost-effective alternative to bandgap references in industrial transmitters where ±0.5% accuracy and 100 ppm/°C drift are acceptable. Its shunt topology simplifies integration in 4–20 mA loops where a stable voltage is needed for sensor excitation or ADC referencing. However, unlike some bandgap references, it does not include built-in enable/shutdown functionality, limiting power management flexibility. Additionally, its noise floor may require filtering in high-precision transmitters, increasing BOM complexity compared to integrated solutions.
What layout practices are recommended to maintain the accuracy of the LM4040C30QDBZT in a mixed-signal PCB environment?
To preserve performance, place the LM4040C30QDBZT close to the reference input of the ADC or DAC, minimizing trace length to reduce parasitic inductance and susceptibility to digital noise. Use a solid ground plane beneath the device and avoid routing high-speed digital signals under or adjacent to the reference path. The current-limiting resistor should be placed near the supply side to minimize loop area. Thermal vias under the SOT-23-3 package are unnecessary due to low power dissipation but can help in high-temperature environments by improving heat spreading.
How does the LM4040C30QDBZT perform under varying load currents, and what are the implications for dynamic reference applications?
The LM4040C30QDBZT maintains regulation as long as cathode current remains between 82 µA (minimum for operation) and 15 mA (maximum rating). Under light loads, the excess current flows through the device, increasing self-heating and potentially affecting long-term stability. In dynamic applications where reference current varies (e.g., pulsed ADC sampling), the external bias resistor must be sized to ensure sufficient current even at peak demand. Insufficient biasing leads to dropout, while excessive current increases power loss without improving performance.
What alternatives exist if tighter initial accuracy than ±0.5% is required in a 3V reference design?
For applications demanding better than ±0.5% initial accuracy, consider the LM4040A30 variant (±0.1%) or precision series references like the REF5030 (±0.05%). The LM4040C30QDBZT’s ±0.5% tolerance may be acceptable in cost-sensitive designs but becomes limiting in calibration-free systems or those requiring absolute measurement accuracy. When upgrading, evaluate trade-offs in cost, package size, and power consumption—higher-accuracy devices often come in larger packages or require additional supply headroom.
Is the LM4040C30QDBZT compatible with lead-free soldering processes, and what are the rework considerations?
The LM4040C30QDBZT is RoHS3 compliant and rated MSL 1 (unlimited floor life), indicating compatibility with standard lead-free reflow profiles up to 260°C peak temperature. During rework, care must be taken to avoid thermal shock, as rapid heating can induce mechanical stress in the SOT-23-3 package. Use a localized hot-air nozzle with controlled airflow to prevent disturbing adjacent components. No special storage or dry-baking is required prior to assembly due to the MSL 1 rating.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments LM4040C30QDBZT

Product Attribute LM4040C30IDBZT LM4040C30QDBZR LM4040C30IDBZTG4 LM4040C30IDBZRG4
Part Number LM4040C30IDBZT LM4040C30QDBZR LM4040C30IDBZTG4 LM4040C30IDBZRG4
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Current - Cathode - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Tolerance - - - -
Temperature Coefficient - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage - Input - - - -
Current - Output - - - -
Current - Supply - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Noise - 0.1Hz to 10Hz - - - -
Noise - 10Hz to 10kHz - - - -
Reference Type - External, Internal External External, Internal
Series - - - -
Voltage - Output (Min/Fixed) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Output Type - Current - Unbuffered Voltage - Buffered -

LM4040C30QDBZT Datasheet PDF

Download LM4040C30QDBZT pdf datasheets and Texas Instruments documentation for LM4040C30QDBZT - Texas Instruments.

PCN Design/Specification
LM404xx 07/Mar/2023.pdf
PCN Assembly/Origin
Qual of NFME 17/Feb/2017.pdf

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    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
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    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
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    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
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    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

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LM4040C30QDBZT Image

LM4040C30QDBZT

Texas Instruments
32D-LM4040C30QDBZT

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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