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

Texas Instruments LM4040D25IDBZRG4

Name: LM4040D25IDBZRG4
Brand: Texas Instruments
SKU: LM4040D25IDBZRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040D25IDBZRG4

Manufacturer:: Texas Instruments

Category:: Voltage Reference

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: LM4040D25IDBZRG4.pdf

Description:: IC VREF SHUNT 1% SOT23-3

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Product details

Overview

LM4040D25IDBZRG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.5 V output with ±1.0% initial accuracy (D grade), 150 ppm/°C temperature coefficient, 35 μV_RMS wideband noise, and stable operation from 45 μA to 15 mA cathode current - used in high-accuracy analog input modules and field transmitters requiring low-drift biasing.

For engineers reviewing the LM4040D25IDBZRG4 datasheet, LM4040D25IDBZRG4 pinout, LM4040D25IDBZRG4 application, or LM4040D25IDBZRG4 equivalent, key selection criteria include industrial-grade (–40°C to +85°C) operation, SOT-23-3 package compatibility, no-output-capacitor requirement, and tight tolerance under varying load and temperature conditions.

Technical Context

The LM4040D25IDBZRG4 operates as a two-terminal shunt reference, sinking cathode current (I_Z) to regulate voltage across its terminals. Its Zener-zap trimmed reverse breakdown ensures stable 2.5 V output with minimal dynamic impedance (≤1.1 Ω at 1 mA) and low thermal hysteresis (0.08%).

It functions without external capacitors, supports all capacitive loads, and maintains regulation over cathode currents from 45 μA (typical minimum) to 15 mA - enabling use in battery-powered and space-constrained systems where supply headroom is limited.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	2.5 V nominal; enables precise ADC/DAC biasing and sensor excitation at standard logic-compatible level.
Initial Accuracy	±1.0% max at 25°C; defines worst-case DC offset in calibration-critical signal chains.
Temp Coefficient	150 ppm/°C max; contributes ≤±0.125% output drift over –40°C to +85°C ambient range.
Operating Current	45 μA to 15 mA; allows ultra-low-power sensing nodes and robust operation under high-load transients.
Output Noise	35 μV_RMS (10 Hz–10 kHz); minimizes added noise in 16-bit+ data acquisition front-ends.
Dynamic Impedance	≤1.1 Ω at 1 mA; ensures <1 mV output shift per 1 mA cathode current change in closed-loop regulators.
Thermal Hysteresis	0.08% max; limits repeatability error after thermal cycling in field-deployed instrumentation.

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm footprint, surface-mount, thermally efficient for compact PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt current/voltage input	Connects to regulated node; sinks current to maintain 2.5 V across anode–cathode.
Anode (Pin 2)	Common reference terminal	Typically tied to system ground; forms return path for cathode current.
NC (Pin 3)	No internal connection	Must be left floating or tied to anode per EMI-sensitive layout guidance.

Key Features

Feature	Design Value
Fixed 2.5 V output	Eliminates external resistor network; reduces BOM count and layout sensitivity in precision references.
No output capacitor required	Enables direct integration into space-limited analog front-ends without stability compensation overhead.
Stable with all capacitive loads	Supports direct connection to ADC input caps or long traces without oscillation risk.
Low 45 μA min operating current	Extends battery life in portable field instruments and wireless sensor nodes.
–40°C to +85°C operation	Validated for industrial environments including process control cabinets and outdoor transmitters.

Applications

Analog Input Module	Field Transmitter
Use Scenario: High-resolution 16-bit analog-to-digital conversion of 4–20 mA loop signals in PLC I/O cards. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for ADC voltage scaling and sensor signal conditioning. Use Value: Enables ±0.025% full-scale accuracy over temperature by limiting reference drift contribution to <0.1%.	Use Scenario: Two-wire 4–20 mA transmitter powering itself from loop current while maintaining calibrated output. IC Role / Device Role / Timing Role: Supplies precision bias voltage for op-amp-based current-sense and V/I conversion circuitry. Use Value: Maintains loop accuracy within ±0.1% despite supply variations and ambient temperature swings from –40°C to +85°C.
Data-Acquisition System	Energy Infrastructure
Use Scenario: Multi-channel isolated DAQ unit measuring grid voltage, current, and power quality parameters. IC Role / Device Role / Timing Role: Serves as master reference for successive-approximation ADCs and anti-aliasing filter biasing. Use Value: 35 μV_RMS noise and <1.1 Ω dynamic impedance prevent SNR degradation in 24-bit sigma-delta measurements.	Use Scenario: Smart metering ICs performing metrology-grade energy measurement in utility meters. IC Role / Device Role / Timing Role: References voltage scaling for current shunt amplifiers and voltage dividers feeding metrology ADCs. Use Value: ±1.0% initial tolerance and 150 ppm/°C TC meet IEC 62053-21 Class 0.2 accuracy requirements over lifetime.

Analog Input Module

Field Transmitter

Use Scenario: High-resolution 16-bit analog-to-digital conversion of 4–20 mA loop signals in PLC I/O cards.

IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for ADC voltage scaling and sensor signal conditioning.

Use Value: Enables ±0.025% full-scale accuracy over temperature by limiting reference drift contribution to <0.1%.

Use Scenario: Two-wire 4–20 mA transmitter powering itself from loop current while maintaining calibrated output.

IC Role / Device Role / Timing Role: Supplies precision bias voltage for op-amp-based current-sense and V/I conversion circuitry.

Use Value: Maintains loop accuracy within ±0.1% despite supply variations and ambient temperature swings from –40°C to +85°C.

Data-Acquisition System

Energy Infrastructure

Use Scenario: Multi-channel isolated DAQ unit measuring grid voltage, current, and power quality parameters.

IC Role / Device Role / Timing Role: Serves as master reference for successive-approximation ADCs and anti-aliasing filter biasing.

Use Value: 35 μV_RMS noise and <1.1 Ω dynamic impedance prevent SNR degradation in 24-bit sigma-delta measurements.

Use Scenario: Smart metering ICs performing metrology-grade energy measurement in utility meters.

IC Role / Device Role / Timing Role: References voltage scaling for current shunt amplifiers and voltage dividers feeding metrology ADCs.

Use Value: ±1.0% initial tolerance and 150 ppm/°C TC meet IEC 62053-21 Class 0.2 accuracy requirements over lifetime.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL4050C25IDBZR	2.5 V, ±0.5% initial accuracy (C grade), 100 ppm/°C TC, same SOT-23-3 package	Better accuracy and lower TC, but higher minimum cathode current (60 μA typical)	Select when tighter initial tolerance and lower drift are prioritized over ultra-low-power operation.
REF3025AIDBZR	2.5 V, ±0.2% initial accuracy (A grade), 50 ppm/°C TC, 50 μA typical quiescent current	Higher accuracy, lower TC, and lower noise (25 μV_RMS), but requires output capacitor for stability	Choose for metrology-grade systems where capacitor addition is acceptable and drift must be minimized.

Compared with TL4050C25IDBZR and REF3025AIDBZR, the LM4040D25IDBZRG4 trades initial accuracy and temperature stability for micropower operation and unconditional stability - making it optimal for cost-sensitive, battery-operated, or capacitor-free designs where ±1.0% tolerance is sufficient.

Availability

LM4040D25IDBZRG4 is available at Aetrix Electronics and suitable for analog input modules, field transmitters, and data-acquisition systems requiring stable component supply with guaranteed long-term sourcing and RoHS-compliant packaging.

Supply support for LM4040D25IDBZRG4 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 digital signal technologies with broad industrial and automotive portfolio coverage.

The LM4040 series belongs to TI's precision voltage reference product line, engineered for high-accuracy, low-power, and capacitor-free operation in industrial sensing, measurement, and control applications.

FAQ

What is the operating temperature range for LM4040D25IDBZRG4?

The LM4040D25IDBZRG4 is characterized for industrial operation from –40°C to +85°C. This range is validated per TI's LM4040xxxI specification and supports deployment in factory automation, process control, and outdoor instrumentation environments where ambient extremes occur.

Does LM4040D25IDBZRG4 require an output capacitor?

No, the LM4040D25IDBZRG4 does not require an output capacitor. It is designed to remain stable with all capacitive loads - including direct connection to ADC input capacitors or long PCB traces - eliminating the need for external stabilization components in most applications.

What is the minimum cathode current needed for LM4040D25IDBZRG4 regulation?

The LM4040D25IDBZRG4 requires a minimum cathode current of 45 μA (typical) to maintain regulation. At 25°C, this value rises to 80 μA across the full –40°C to +85°C range, ensuring reliable startup and stability in ultra-low-power systems.

How does the 150 ppm/°C temperature coefficient affect LM4040D25IDBZRG4 performance?

The 150 ppm/°C maximum temperature coefficient means LM4040D25IDBZRG4's output may drift up to ±0.125% over its –40°C to +85°C operating range. This translates to ±3.125 mV change from nominal 2.5 V, which is acceptable for Class 0.5 industrial measurement systems.

Is LM4040D25IDBZRG4 pin-compatible with other LM4040 variants?

Yes, LM4040D25IDBZRG4 uses the standard SOT-23-3 (DBZ) package and shares identical pinout (Cathode–Anode–NC) with all LM4040x25I and LM4040x25Q variants in DBZ packaging - enabling drop-in replacement across accuracy grades without PCB redesign.

LM4040D25IDBZRG4 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):: 2.5V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±1%

Temperature Coefficient:: 150ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 35µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 80 µA

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

LM4040D25IDBZRG4 FAQ

1.How can I place an order for LM4040D25IDBZRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040D25IDBZRG4 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 LM4040D25IDBZRG4 reliable?

The price and inventory of LM4040D25IDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D25IDBZRG4 is usually 5 days.

3.What payment methods are accepted for LM4040D25IDBZRG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D25IDBZRG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040D25IDBZRG4?

LM4040D25IDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040D25IDBZRG4 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 LM4040D25IDBZRG4?

For technical support, including LM4040D25IDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D25IDBZRG4 requirements.

6.How does Aetrix verify that LM4040D25IDBZRG4 is sourced from the original manufacturer or authorized distributors?

All LM4040D25IDBZRG4 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 LM4040D25IDBZRG4 meets industry standards.

7.What is the process for return or replacement of LM4040D25IDBZRG4?

All LM4040D25IDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D25IDBZRG4, 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 LM4040D25IDBZRG4 part is unused and in its original packaging.

Return procedure for LM4040D25IDBZRG4:

1.Submit a request within 90 days.

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

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