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LM4040-N

ACTIVE

100-ppm/°C precision micropower shunt voltage reference

Product details

VO (V) 2, 2.046, 2.048, 2.5, 3, 4.096, 5, 8.192, 10 Initial accuracy (max) (%) 0.1, 0.2, 0.5, 1, 2 VO adj (min) (V) 2.048 VO adj (max) (V) 10 Iz for regulation (min) (µA) 45 Reference voltage (V) Fixed Rating Catalog Temp coeff (max) (ppm/°C) 100, 150 Operating temperature range (°C) -40 to 85 Iout/Iz (max) (mA) 15
VO (V) 2, 2.046, 2.048, 2.5, 3, 4.096, 5, 8.192, 10 Initial accuracy (max) (%) 0.1, 0.2, 0.5, 1, 2 VO adj (min) (V) 2.048 VO adj (max) (V) 10 Iz for regulation (min) (µA) 45 Reference voltage (V) Fixed Rating Catalog Temp coeff (max) (ppm/°C) 100, 150 Operating temperature range (°C) -40 to 85 Iout/Iz (max) (mA) 15
SOT-23 (DBZ) 3 6.9204 mm² 2.92 x 2.37 SOT-SC70 (DCK) 5 4.2 mm² 2 x 2.1 TO-92 (LP) 3 19.136 mm² 5.2 x 3.68
  • LM4040-N-Q1 AEC Q-100 qualified for automotive applications
    • Extended Grade 1: −40°C to +125°C, TA
    • Industrial Grade 3: −40°C to +85°C, TA
  • Small packages: SOT-23, TO-92, and SC70
  • No output capacitor required
  • Tolerates capacitive loads
  • Fixed reverse breakdown voltages of 2.048V, 2.5V, 3V, 4.096V, 5V, 8.192V, and 10V
  • Key specifications (2.5V LM4040-N)
    • Output voltage tolerance (A Grade, 25°C): ±0.1% (maximum)
    • Low output noise (10Hz to 10kHz): 35µVrms (typical)
    • Wide operating current range: 60µA to 15mA
    • Industrial temperature range: −40°C to +85°C
    • Extended temperature range: −40°C to +125°C
    • Low temperature coefficient: 100ppm/°C (maximum)
  • LM4040-N-Q1 AEC Q-100 qualified for automotive applications
    • Extended Grade 1: −40°C to +125°C, TA
    • Industrial Grade 3: −40°C to +85°C, TA
  • Small packages: SOT-23, TO-92, and SC70
  • No output capacitor required
  • Tolerates capacitive loads
  • Fixed reverse breakdown voltages of 2.048V, 2.5V, 3V, 4.096V, 5V, 8.192V, and 10V
  • Key specifications (2.5V LM4040-N)
    • Output voltage tolerance (A Grade, 25°C): ±0.1% (maximum)
    • Low output noise (10Hz to 10kHz): 35µVrms (typical)
    • Wide operating current range: 60µA to 15mA
    • Industrial temperature range: −40°C to +85°C
    • Extended temperature range: −40°C to +125°C
    • Low temperature coefficient: 100ppm/°C (maximum)

Designed for space-critical applications, the LM4040-N precision voltage reference is available in small SC70 and SOT-23 surface-mount package. The advanced design of the LM4040-N eliminates the need for an external stabilizing capacitor while maintaining stability with any capacitive load, thus making the LM4040-N easy to use. Further reducing design effort is the availability of several fixed reverse breakdown voltages: 2.048V, 2.5V, 3V, 4.096V, 5V, 8.192V, and 10V. The minimum operating current increases from 60µA for the 2.5V LM4040-N to 100µA for the 10V LM4040-N. All versions have a maximum operating current of 15mA.

The LM4040-N uses a fuse and Zener-zap reverse breakdown voltage trim during wafer sort to make sure that the prime parts have an accuracy of better than ±0.1% (A grade) at 25°C. Bandgap reference temperature drift curvature correction and low dynamic impedance provide stable reverse breakdown voltage accuracy over a wide range of operating temperatures and currents.

Also available is the LM4041-N with two reverse breakdown voltage versions: adjustable and 1.2V. See the LM4041-N data sheet (SNOS641).

Designed for space-critical applications, the LM4040-N precision voltage reference is available in small SC70 and SOT-23 surface-mount package. The advanced design of the LM4040-N eliminates the need for an external stabilizing capacitor while maintaining stability with any capacitive load, thus making the LM4040-N easy to use. Further reducing design effort is the availability of several fixed reverse breakdown voltages: 2.048V, 2.5V, 3V, 4.096V, 5V, 8.192V, and 10V. The minimum operating current increases from 60µA for the 2.5V LM4040-N to 100µA for the 10V LM4040-N. All versions have a maximum operating current of 15mA.

The LM4040-N uses a fuse and Zener-zap reverse breakdown voltage trim during wafer sort to make sure that the prime parts have an accuracy of better than ±0.1% (A grade) at 25°C. Bandgap reference temperature drift curvature correction and low dynamic impedance provide stable reverse breakdown voltage accuracy over a wide range of operating temperatures and currents.

Also available is the LM4041-N with two reverse breakdown voltage versions: adjustable and 1.2V. See the LM4041-N data sheet (SNOS641).

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Technical documentation

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Type Title Date
* Data sheet LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference datasheet (Rev. L) 29 Jun 2024
Application note Voltage Reference Selection and Design Tips For Data Converters (Rev. B) PDF | HTML 09 Jan 2024
Application brief Using Voltage Supervisors in High Voltage Applications (Rev. B) PDF | HTML 20 Feb 2023
E-book Tips and tricks for designing with voltage references (Rev. A) 07 May 2021
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Technical article How to use a voltage reference as a voltage regulator PDF | HTML 04 Dec 2018
Technical article Can I get that shunt reference to go, please? PDF | HTML 29 Feb 2016
Application note AN-1525 Single Supply Operation of the DAC0800 and DAC0802 (Rev. A) 22 Apr 2013
Application note TO-92 Packing Options / Ordering Instructions (Rev. A) 23 Jun 2010
Application note Implementing Single-Chip FPGA Power Solutions 21 Mar 2007
Application note Negative Buck Switching Regulator (using LM258x) 21 Mar 2007

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TMDXEVM368 — TMS320DM36x Evaluation Module

The TMS320DM36x Digital Video Evaluation Module (DVEVM) enables developers to start immediate evaluation of TI’s Digital Media (DMx) processors and begin building digital video applications such as IP security cameras, action cameras, drones, wearables, digital signage, video doorbells, and (...)

User guide: PDF
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Calculation tool

SHUNT-REFERENCE-CALC Shunt Reference Selector and Design Calculator

This tool guides the user through the design process for the TLx431 and LM40x0 family of shunt voltage references. This calculator will recommend resistance and capacitance values to optimally meet the user's desired specifications.
Supported products & hardware

Supported products & hardware

Products
Shunt voltage references
ATL431 2.5-V low-IQ adjustable precision shunt regulator ATL431LI Low-IQ programmable shunt regulator offered in an ultra-small DQN package ATL431LI-Q1 Automotive, high-bandwidth, low-IQ programmable shunt regulator (pinout: KRA) ATL432 2.5-V precision programmable shunt regulator ATL432LI High-bandwidth, low-IQ programmable shunt regulator (pinout: RKA) ATL432LI-Q1 Automotive, high-bandwidth, low-IQ programmable shunt regulator (pinout: RKA) LM4030 Ultra-high-precision shunt voltage reference LM4040 Fixed voltage, 45-µA, precision micropower shunt voltage reference LM4040-N 100-ppm/°C precision micropower shunt voltage reference LM4040-N-Q1 Automotive, 100-ppm/°C precision micropower shunt voltage reference LM4040C25-EP Enhanced Product 2.5-V Precision Micropower Shunt Voltage Reference, 0.5% accuracy LM4041-N Fixed & adjustable, 45-µA, precision micropower shunt voltage reference LM4041-N-Q1 Automotive, precision micropower shunt voltage reference LM4041A12 1.2-V precision micropower shunt voltage reference with 0.1% accuracy LM4041B Adjustable, precision micropower shunt voltage reference with 0.2% accuracy LM4041B12 1.2-V precision micropower shunt voltage reference with 0.2% accuracy LM4041C Adjustable, precision micropower shunt voltage reference with 0.5% accuracy LM4041C12 1.2-V precision micropower shunt voltage reference with 0.5% accuracy LM4041D Adjustable, precision micropower shunt voltage reference with 1% accuracy LM4041D12 1.2-V precision micropower shunt voltage reference with 1% accuracy LM4050-N 50-ppm/°C precision micropower shunt voltage reference LM4050-N-Q1 Automotive, 50-ppm/°C precision micropower shunt voltage reference LM4050QML-SP Radiation-hardened QMLV, 2.5-V or 5-V shunt voltage reference LM4051-N Fixed & adjustable, precision micropower shunt voltage reference LMV431 1.5%, low-voltage (1.24-V) adjustable precision shunt regulator LMV431A 1%, low-voltage (1.24-V) adjustable precision shunt regulator LMV431B 0.5%, low-voltage (1.24-V) adjustable precision shunt regulator TL431 Adjustable precision shunt regulator TL431-Q1 Automotive adjustable precision shunt regulator (pin layout: KRA) TL431C 2% adjustable precision shunt regulator TL431LI Adjustable precision shunt regulator with optimized reference current (pin layout: KRA) TL431LI-Q1 Automotive, adjustable, precision shunt regulator with optimized reference current TL432 Adjustable precision shunt regulator (reverse pinout) TL432-Q1 Automotive adjustable precision shunt regulator (pin layout: RKA) TL432LI Adjustable precision shunt regulator with optimized reference current (pin layout: RKA) TL432LI-Q1 Automotive, adjustable, precision shunt regulator with optimized reference current TLA431 All-capacitor stable precision programmable reference with KRA pin layout TLV431 1.5% accuracy, low-voltage, adjustable precision shunt regulator TLV431A 1% accuracy, low-voltage, adjustable precision shunt regulator TLV431A-Q1 Automotive, low-voltage adjustable precision shunt regulator TLV431B 0.5% accuracy, low-voltage, adjustable precision shunt regulator TLV431B-Q1 Automotive, low-voltage adjustable precision shunt regulator TLVH431 1.5% low-voltage wide-operating current adjustable precision shunt regulator TLVH431A 1% low-voltage wide-operating current adjustable precision shunt regulator TLVH431A-Q1 Automotive, low-voltage adjustable precision shunt regulator TLVH431B 0.5% low-voltage wide-operating current adjustable precision shunt regulator TLVH431B-EP Enhanced-plastic 0.5% low-voltage wide-operating-current adjustable precision shunt regulator TLVH431B-Q1 Automotive, low-voltage adjustable precision shunt regulator (reverse pinout) TLVH432 1.5% low-voltage wide-operating current adjustable precision shunt regulator (reverse pinout) TLVH432A 1% low-voltage wide-operating current adjustable precision shunt regulator (reverse pinout) TLVH432B 0.5% low-voltage wide-operating current adjustable precision shunt regulator (reverse pinout)
General-purpose op amps
TLV4313 Quad, 5.5-V, 1-MHz, low quiescent current (65-μA), RRIO operational amplifier TLV4314 Quad, 5.5-V, 3-MHz, RRIO operational amplifier TLV4314-Q1 Automotive-grade, quad, 5.5-V, 3-MHz, RRIO operational amplifier TLV4316 Quad, 5.5-V, 10-MHz, RRIO operational amplifier TLV4316-Q1 Automotive-grade, quad, 5.5-V, 10-MHz, RRIO operational amplifier TLV4379 Quad, 5.5-V, 90-kHz, low quiescent current (4-μA), RRIO operational amplifier
Precision op amps (Vos<1mV)
TLV4333 Quad, 350-kHz, low-noise, RRIO, CMOS operational amplifier for cost-sensitive systems TLV4376 Quad 5.5-MHz, 100-µV offset, 8-nV/√Hz noise, 815-µA power, precision operational amplifiers TLV4387 Quad, ultra-high-precision (10 μV) zero-drift (0.01 μV/°C) low-input-bias-current op amp
Calculation tool

SHUNT_VOLTAGE_REFERENCE_RESISTOR_CALCULATOR Shunt Voltage Reference External Resistor Quick Start Calculator

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Supported products & hardware

Supported products & hardware

Products
Die & wafer services
LM336-2.5-MIL Shunt Voltage Reference
Shunt voltage references
ATL431 2.5-V low-IQ adjustable precision shunt regulator LM136-2.5-N Voltage Reference Diode LM136-5.0 5.0V Reference Diode LM136-5.0QML 5.0V Reference Diode LM136A-2.5QML 2.5V Reference Diode LM136A-2.5QML-SP Radiation-hardened QMLV, 2.5-V shunt voltage reference LM136A-5.0QML 5.0V Reference Diode LM185-1.2-N Micropower Voltage Reference Diode LM185-1.2QML Micropower Voltage Reference Diode LM185-1.2QML-SP Radiation-hardened QMLV, 1.2-V shunt voltage reference LM185-2.5-N Micropower Voltage Reference Diode LM185-2.5QML Micropower Voltage Reference Diode LM185-2.5QML-SP Space-grade QMLV 2.5-V  shunt voltage reference LM185-ADJ Adjustable Micropower Voltage Reference LM185QML Adjustable Micropower Voltage Reference LM285-1.2 1.235-V, –40°C to +85°C, micropower voltage reference LM285-1.2-N 1.235-V, –40°C to +85°C, micropower voltage reference diode LM285-2.5 2.5-V, –40°C to +85°C, micropower voltage reference LM285-2.5-N 2.5-V, –40°C to +85°C, micropower voltage reference diode LM285-ADJ Adjustable, 85°C, micropower voltage reference LM336-2.5 0°C to 70°C, 2.5-V integrated reference circuit LM336-2.5-N Voltage reference diode LM336-5.0 5-V reference diode LM385-1.2 1.235-V, 2%, 0°C to 70°C, micropower voltage reference LM385-1.2-MIL Micropower Voltage Reference LM385-1.2-N 1.235-V, 0°C to 70°C, micropower voltage reference diode LM385-2.5 2.5-V, 2%, 70°C, micropower voltage reference LM385-2.5-N 2.5-V, 0°C to 70°C, micropower voltage reference diode LM385-ADJ Adjustable, 70°C, micropower voltage reference LM4030 Ultra-high-precision shunt voltage reference LM4040 Fixed voltage, 45-µA, precision micropower shunt voltage reference LM4040-N 100-ppm/°C precision micropower shunt voltage reference LM4040-N-Q1 Automotive, 100-ppm/°C precision micropower shunt voltage reference LM4041-N Fixed & adjustable, 45-µA, precision micropower shunt voltage reference LM4041-N-Q1 Automotive, precision micropower shunt voltage reference LM4050-N 50-ppm/°C precision micropower shunt voltage reference LM4050-N-Q1 Automotive, 50-ppm/°C precision micropower shunt voltage reference LM4050QML-SP Radiation-hardened QMLV, 2.5-V or 5-V shunt voltage reference LM4051-N Fixed & adjustable, precision micropower shunt voltage reference LM431 2%, 1%, or 0.5% accuracy, adjustable precision Zener shunt regulator LM4431 Micropower shunt voltage reference LMV431 1.5%, low-voltage (1.24-V) adjustable precision shunt regulator LMV431A 1%, low-voltage (1.24-V) adjustable precision shunt regulator LMV431B 0.5%, low-voltage (1.24-V) adjustable precision shunt regulator
Current references
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Schematic: PDF
Reference designs

PMP15035 — 1000-W, Bidirectional, 12-V to 12-V Converter Reference Design

This reference design is a dual-channel, bidirectional converter suitable for 12-V to 12-V, dual-battery system, automotive applications. This reference design has a wide input range (3 V to 40 V) and could give full load (1kW) in the input voltage from 9V to 18V by using two LM5170-Q1 (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-00777 — Active Integrator for Rogowski Coil Reference Design with Improved Accuracy for Relay and Breaker

This reference design shows an active integrator design that covers wide-input current range for Rogowski Coil with accuracy, linearity, stability and repeatability. The integrator uses a precision amplifier with very-low offset and temperature drift. Two configurations of the integrator are (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00912 — Shunt-Based High Current Measurement (200-A) Reference Design with Reinforced Isolation Amplifier

This isolated current measurement reference design uses external shunts, reinforced isolation amplifiers and isolated power supply. The shunt voltage is limited to 25-mV max. This reduces power dissipation in the shunt to enable a high-current measurement range up to 200 A. Shunt voltage is (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00445 — Shunt-Based 200A Peak Current Measurement Reference Design Using Isolation Amplifier

This reference design is for isolated current measurement using a shunt and isolated amplifier. By limiting the shunt voltage to 25 mV, this design is able to reduce power dissipation in the shunt and achieve a high-current measurement range of up to 200 A. Shunt voltage is further amplified (...)
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOT-23 (DBZ) 3 Ultra Librarian
SOT-SC70 (DCK) 5 Ultra Librarian
TO-92 (LP) 3 Ultra Librarian

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