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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

STMicroelectronics LM4040BECT-3.0

Name: LM4040BECT-3.0
Brand: STMicroelectronics
SKU: LM4040BECT-3.0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040BECT-3.0

Manufacturer:: STMicroelectronics

Category:: Voltage Reference

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: LM4040BECT-3.0.pdf

Description:: IC VREF SHUNT 3V 5TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:1,800

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Product details

Overview

LM4040BECT-3.0 from STMicroelectronics is a precision micropower shunt voltage reference delivering a stable 3.0 V output with ±0.2% initial accuracy at 25 °C, 70 ppm/°C max temperature coefficient, and ultra-low 10 µA operating current. It operates across –40 to +125 °C and supports capacitive loads without instability-ideal for high-accuracy ADC biasing in portable instrumentation.

For engineers reviewing the LM4040BECT-3.0 datasheet, LM4040BECT-3.0 pinout, LM4040BECT-3.0 application, or LM4040BECT-3.0 equivalent, key selection criteria include shunt reference stability under low-current conditions, thermal hysteresis (120 ppm), dynamic impedance (0.15–0.3 Ω), noise performance (10 µV_p-p LF), and SOT323-5L space-constrained layout compatibility.

Technical Context

The LM4040BECT-3.0 functions as a two-terminal shunt reference, regulating voltage by sinking adjustable cathode current while maintaining fixed reverse breakdown voltage. Its bandgap-derived core achieves ±0.2% tolerance at 25 °C and sustains 20–70 ppm/°C drift over full industrial temperature range.

It exhibits low-frequency noise of 10 µV_p-p (0.1–10 Hz) and wideband noise of 95 µV_RMS, with static impedance under 0.3 Ω and thermal hysteresis of 120 ppm-enabling use in high-resolution data acquisition where reference drift directly impacts measurement fidelity.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.0 V nominal; guaranteed 2.994–3.006 V at 12 µA and 25 °C - enables direct interface with 3.0 V ADC references and LDO feedback networks.
Initial Accuracy	±0.2% at 25 °C - reduces calibration burden in factory-trimmed sensor signal chains.
Temp Coefficient	Max 70 ppm/°C - limits worst-case drift to ±8.4 mV over –40 to +125 °C span.
Operating Current	10 µA typical minimum; 15 mA max - supports battery-powered systems with multi-year runtime.
Low-Freq Noise	10 µV_p-p (0.1–10 Hz) - preserves ENOB in 16-bit+ SAR and delta-sigma converters.
Dynamic Impedance	0.15–0.3 Ω - minimizes load-induced voltage shift during fast current transients.
Thermal Hysteresis	120 ppm - ensures repeatable voltage after thermal cycling, critical for field-deployed test equipment.

Pinout & Package

SOT323-5L package: 1.35 mm × 2.1 mm footprint, 0.65 mm pitch, 0.9 mm height; RoHS-compliant ECOPACK2, suitable for high-density PCBs and automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Reference Output / Current Sink	Connected to regulated node; sinks all operating current - requires series resistor from supply to set Ik.
Anode (Pin 3)	Ground Reference	Return path for cathode current; must be low-impedance to avoid ground bounce errors.
NC (Pins 2 & 4)	No Connect	Internally unconnected; must remain floating or tied to anode per datasheet - no routing or thermal relief required.
NC (Pin 5)	No Connect	Redundant NC terminal; identical electrical behavior to Pins 2 & 4 - omitted from schematic symbol.

Key Features

Feature	Design Value
Stable with capacitive loads	Guaranteed stability up to 1 µF output capacitance - eliminates need for external isolation resistors in filtering stages.
Micropower operation	10 µA min operating current - extends battery life in wireless sensor nodes and handheld meters.
Industrial temperature range	–40 to +125 °C operation - qualified for under-hood automotive sensors and factory-floor PLC modules.
Low thermal hysteresis	120 ppm voltage shift after thermal cycling - maintains calibration integrity in environments with repeated power-on/off cycles.
High ESD robustness	2 kV HBM rating - withstands handling and board-level assembly without additional protection circuitry.

Applications

Portable Multimeter Front-End

Data Logger ADC Reference

Use Scenario: Handheld digital multimeter measuring DC voltage with 0.1% accuracy requirement and 10-year calibration interval.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 3.0 V reference for 24-bit delta-sigma ADC and internal DAC calibration.

Use Value: ±0.2% initial tolerance and 70 ppm/°C TC ensure <0.05% total error contribution over full operating temperature range.

Use Scenario: Battery-powered environmental data logger sampling temperature, humidity, and pressure every 10 seconds for 5 years.

IC Role / Device Role / Timing Role: Precision bias source for rail-to-rail op-amps driving SAR ADC inputs in low-power analog front-end.

Use Value: 10 µA operating current extends coin-cell lifetime beyond 60 months; 10 µV_p-p LF noise preserves 18-bit effective resolution.

Medical Pulse Oximeter Sensor Bias

Industrial 4–20 mA Transmitter

Use Scenario: Wearable pulse oximeter requiring stable LED bias and photodiode amplifier reference under varying skin contact temperatures.

IC Role / Device Role / Timing Role: Dual-role reference: sets LED current sink threshold and provides common-mode voltage for transimpedance amplifier.

Use Value: Low thermal hysteresis (120 ppm) prevents baseline drift during patient-warm-up cycles; SOT323-5L enables compact flex PCB integration.

Use Scenario: Loop-powered 4–20 mA transmitter in hazardous area with ambient temperature swings from –40 to +85 °C.

IC Role / Device Role / Timing Role: Primary voltage reference for DAC output scaling and current loop regulation circuitry.

Use Value: 70 ppm/°C TC ensures <±0.8% full-scale error over temperature - meets IEC 61000-6-2 immunity requirements without software compensation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431ACDBVR	Adjustable (2.5 V base), ±0.5% initial accuracy, 100 ppm/°C TC, 80 µA min Ik	Requires external resistor network; higher current draw increases power budget impact	Choose when programmability justifies reduced accuracy and higher quiescent current.
MAX6008AEUR+T	Fixed 3.0 V, ±0.1% accuracy, 20 ppm/°C TC, 35 µA min Ik, SOT23-3	Higher precision but larger tempco drift margin; no NC pins simplifies layout	Prefer when sub-ppm/°C stability is critical and board space allows SOT23-3 footprint.

Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040BECT-3.0 offers optimal balance of ultra-low current (10 µA), moderate accuracy (±0.2%), and compact SOT323-5L packaging-making it ideal for space- and power-constrained industrial sensing where absolute top-tier stability is secondary to longevity and layout density.

Availability

LM4040BECT-3.0 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, medical wearables, and industrial 4–20 mA transmitters requiring stable component supply across extended product lifecycles.

Supply support for LM4040BECT-3.0 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, analog components, and MEMS sensors for industrial, automotive, and consumer markets.

The LM4040 series belongs to ST's precision analog portfolio, engineered specifically for high-accuracy, low-power shunt reference applications in harsh-temperature and space-constrained environments.

FAQ

What is the minimum cathode current required for regulation at –40 °C?

At –40 °C, the LM4040BECT-3.0 requires 25 µA minimum cathode current to maintain regulation, per Table 3 of DS13886 Rev 4. This is higher than the 12 µA specified at 25 °C due to increased bandgap curvature effects at cold extremes.

Can the NC pins on the SOT323-5L package be grounded?

Yes - the NC pins (2, 4, and 5) may be left unconnected or tied to the anode (Pin 3) as stated in Figure 1. Grounding them is not recommended, as it risks introducing ground-path noise into the reference node and violates the manufacturer's connection guidance.

How does load capacitance affect stability, and what is the maximum safe value?

Per Figure 11, the LM4040BECT-3.0 remains stable with up to 1 µF output capacitance when operated between 10 µA and 15 mA cathode current. Exceeding this capacitance without series resistance risks oscillation, especially near the 10 µA minimum operating point.

Is the 3.0 V output trimmed at final test, and how is accuracy verified?

Yes - the 3.0 V output is 100% production tested at 25 °C per Table 4, with ±0.2% limits enforced during wafer sort and final test. Full-temperature-range performance is guaranteed via correlation testing and design validation, not 100% screening.

LM4040BECT-3.0 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 5-TSSOP, SC-70-5, SOT-353

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 3V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±0.2%

Temperature Coefficient:: 70ppm/°C

Noise - 0.1Hz to 10Hz:: 10µVp-p

Noise - 10Hz to 10kHz:: 95µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 25 µA

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323-5

LM4040BECT-3.0 FAQ

1.How can I place an order for LM4040BECT-3.0 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040BECT-3.0 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 LM4040BECT-3.0 reliable?

The price and inventory of LM4040BECT-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BECT-3.0 is usually 5 days.

3.What payment methods are accepted for LM4040BECT-3.0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BECT-3.0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040BECT-3.0?

LM4040BECT-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040BECT-3.0 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 LM4040BECT-3.0?

For technical support, including LM4040BECT-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BECT-3.0 requirements.

6.How does Aetrix verify that LM4040BECT-3.0 is sourced from the original manufacturer or authorized distributors?

All LM4040BECT-3.0 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 LM4040BECT-3.0 meets industry standards.

7.What is the process for return or replacement of LM4040BECT-3.0?

All LM4040BECT-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BECT-3.0, 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 LM4040BECT-3.0 part is unused and in its original packaging.

Return procedure for LM4040BECT-3.0:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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