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

Texas Instruments LM4040B41IDBZTG4

Name: LM4040B41IDBZTG4
Brand: Texas Instruments
SKU: LM4040B41IDBZTG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040B41IDBZTG4

Manufacturer:: Texas Instruments

Category:: Voltage Reference

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

Datasheet:: LM4040B41IDBZTG4.pdf

Description:: IC VREF SHUNT 0.2% SOT23-3

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Product details

Overview

LM4040B41IDBZTG4 from Texas Instruments is a precision micropower shunt voltage reference with 4.096 V nominal output, ±0.2% initial accuracy (B grade), 100 ppm/°C temperature coefficient, 35 μV_RMS wideband noise, and stable operation from 45 μA to 15 mA cathode current. It serves as a compact, low-drift reference in high-resolution ADC/DAC biasing and sensor signal conditioning circuits.

For engineers reviewing the LM4040B41IDBZTG4 datasheet, LM4040B41IDBZTG4 pinout, LM4040B41IDBZTG4 application, or LM4040B41IDBZTG4 equivalent, key selection considerations include its SOT-23-3 package, industrial temperature range (–40°C to +85°C), no-output-capacitor requirement, and compatibility with capacitive loads in space-constrained analog front-ends.

Technical Context

The LM4040B41IDBZTG4 operates as a two-terminal shunt reference, sinking cathode current (I_Z) to maintain a stable 4.096 V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed bandgap architecture delivers tight initial tolerance and low thermal drift without external components.

It features low dynamic impedance (≤0.8 Ω at 1 mA), minimal voltage change vs. cathode current (≤6 mV over 1–15 mA), and thermal hysteresis of 0.08% - enabling stable performance in battery-powered instrumentation and field transmitters subject to thermal cycling.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.096 V nominal; exact value enables direct 12-bit full-scale scaling with 5 V or 3.3 V ADC references.
Initial Accuracy	±0.2% max at 25°C; ensures ≤8.2 mV absolute error before calibration in precision measurement systems.
Temp Coefficient	100 ppm/°C max; contributes ≤0.026 V drift over –40°C to +85°C ambient, critical for unregulated supply environments.
Wideband Noise	35 μV_RMS (10 Hz–10 kHz); low enough to avoid degrading ENOB in 16-bit+ data acquisition channels.
Cathode Current Range	45 μA to 15 mA; supports ultra-low-power sensor nodes and high-current reference buffering without external circuitry.
Dynamic Impedance	0.8 Ω max at 1 mA; maintains output regulation under fast load transients in closed-loop feedback paths.
Long-Term Stability	120 ppm after 1000 h; predictable aging behavior simplifies lifetime accuracy budgeting in industrial equipment.

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm footprint, surface-mount, lead-free, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt current input / voltage reference node	Connects to regulated rail or feedback point; sinks all operating current; defines reference potential.
Anode (Pin 2)	Common return / ground reference	Typically tied to system ground; forms the reference return path; must be low-impedance for stability.
NC (Pin 3)	No internal connection	Unused terminal; may be left floating or tied to anode per EMI mitigation guidance in noisy environments.

Key Features

Feature	Design Value
Zero-output-capacitor operation	Stable with any capacitive load; eliminates BOM cost and board area for external stabilization caps.
Micropower startup	45 μA typical minimum cathode current; enables use in energy-harvesting and coin-cell-powered sensors.
Low thermal hysteresis	0.08% voltage shift after –40°C ↔ 125°C thermal cycling; preserves calibration integrity across field deployments.
Extended temp support	Specified over –40°C to +85°C; qualified for industrial control, automotive cabin electronics, and outdoor infrastructure.
Fuse-trimmed precision	Factory-trimmed via Zener-zap process; achieves B-grade 0.2% tolerance without post-assembly calibration.

Applications

Data-Acquisition Systems	Field Transmitters
Use Scenario: High-resolution (16–24-bit) ADC reference in portable multimeters and power analyzers. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 4.096 V reference for SAR ADC conversion. Use Value: Enables full-scale utilization of 12-bit digital codes (4096 steps) without scaling resistors or gain stages.	Use Scenario: 4–20 mA loop-powered pressure/temperature transmitter with local analog sensing. IC Role / Device Role / Timing Role: Precision bias source for op-amp signal conditioning and DAC output scaling. Use Value: Maintains <±0.1% total error over temperature, meeting IEC 61293 Class 0.1 accuracy requirements.
Analog Input Module	Energy Infrastructure
Use Scenario: Modular PLC analog input card supporting multiple sensor types (RTD, thermocouple, voltage). IC Role / Device Role / Timing Role: Shared reference for multiplexed PGA and ADC front-end; referenced to isolated power domain. Use Value: Low noise and drift minimize channel-to-channel gain mismatch and enable auto-zero calibration.	Use Scenario: Smart meter voltage monitoring and anti-tampering detection circuitry. IC Role / Device Role / Timing Role: Reference for high-side voltage divider monitoring and fault threshold comparison. Use Value: Stable 4.096 V output allows direct 12-bit ADC mapping to 0–1000 V AC ranges with ±1 V resolution.

Data-Acquisition Systems

Field Transmitters

Use Scenario: High-resolution (16–24-bit) ADC reference in portable multimeters and power analyzers.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 4.096 V reference for SAR ADC conversion.

Use Value: Enables full-scale utilization of 12-bit digital codes (4096 steps) without scaling resistors or gain stages.

Use Scenario: 4–20 mA loop-powered pressure/temperature transmitter with local analog sensing.

IC Role / Device Role / Timing Role: Precision bias source for op-amp signal conditioning and DAC output scaling.

Use Value: Maintains <±0.1% total error over temperature, meeting IEC 61293 Class 0.1 accuracy requirements.

Analog Input Module

Energy Infrastructure

Use Scenario: Modular PLC analog input card supporting multiple sensor types (RTD, thermocouple, voltage).

IC Role / Device Role / Timing Role: Shared reference for multiplexed PGA and ADC front-end; referenced to isolated power domain.

Use Value: Low noise and drift minimize channel-to-channel gain mismatch and enable auto-zero calibration.

Use Scenario: Smart meter voltage monitoring and anti-tampering detection circuitry.

IC Role / Device Role / Timing Role: Reference for high-side voltage divider monitoring and fault threshold comparison.

Use Value: Stable 4.096 V output allows direct 12-bit ADC mapping to 0–1000 V AC ranges with ±1 V resolution.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM4040C41IDBZRG4	±0.5% initial accuracy, same 4.096 V output and SOT-23-3 package	Lower-cost option where system-level calibration compensates for initial error	Select when long-term stability and noise performance are retained but tighter initial tolerance is not required.
REF3040AIDBZR	Series topology, 4.096 V, ±0.2% accuracy, higher quiescent current (45 μA vs. 75 μA typ)	Requires input headroom; unsuitable for shunt-based low-headroom or floating configurations	Choose only if system design permits series reference placement and can accommodate 2.5 V min input voltage.

Compared with LM4040C41IDBZRG4, the LM4040B41IDBZTG4 provides 0.3% tighter initial accuracy at identical noise and thermal performance; compared with REF3040AIDBZR, it offers true shunt operation with no minimum input voltage constraint, enabling direct replacement in existing two-terminal designs.

Availability

LM4040B41IDBZTG4 is available at Aetrix Electronics and suitable for data-acquisition systems, field transmitters, and analog input modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LM4040B41IDBZTG4 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 and embedded processing technologies, with decades of expertise in precision reference design and high-reliability manufacturing.

The LM4040 family was engineered for cost-sensitive, space-constrained applications demanding micropower operation, zero-external-component stability, and industrial-grade accuracy - particularly in sensor interfaces and portable instrumentation.

FAQ

What is the operating temperature range for LM4040B41IDBZTG4?

The LM4040B41IDBZTG4 is characterized for operation over the industrial temperature range of –40°C to +85°C. This range is explicitly specified in the device's orderable part number suffix "I" and confirmed in Section 6.3 (Recommended Operating Conditions) of the TI datasheet SLOS456Q. The LM4040B41IDBZTG4 does not support the extended –40°C to +125°C range denoted by "Q" suffix variants.

Does LM4040B41IDBZTG4 require an output capacitor?

No, the LM4040B41IDBZTG4 is stable with all capacitive loads and requires no output capacitor for operation. This is a core feature confirmed in the "Features" section and "Description" of the TI datasheet, enabling simplified layout and reduced BOM count in compact analog designs.

What is the minimum cathode current needed for LM4040B41IDBZTG4 to regulate?

The LM4040B41IDBZTG4 requires a minimum cathode current (I_Z,min) of 45 μA at 25°C to maintain regulation, as specified in Table 6.14 of the TI datasheet. Over the full industrial temperature range (–40°C to +85°C), this increases to 80 μA maximum - a critical parameter for low-power sensor biasing and battery-life calculations.

How does the noise performance of LM4040B41IDBZTG4 impact high-resolution ADCs?

The LM4040B41IDBZTG4 delivers 35 μV_RMS wideband noise (10 Hz–10 kHz), directly limiting the effective number of bits (ENOB) in ADC systems. For a 4.096 V reference spanning a 16-bit ADC, this noise contributes ≈0.85 LSB RMS, preserving >15.5 ENOB - sufficient for most 16-bit precision data acquisition without additional filtering.

Is LM4040B41IDBZTG4 pin-compatible with other LM4040 grades in SOT-23-3?

Yes, all LM4040 variants in the DBZ (SOT-23-3) package - including LM4040A41IDBZRG4, LM4040C41IDBZRG4, and LM4040D41IDBZRG4 - share identical pinout (Cathode, Anode, NC) and footprint. This allows drop-in substitution across accuracy grades without PCB revision, provided thermal and accuracy requirements are re-evaluated.

LM4040B41IDBZTG4 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:: Discontinued at Digi-Key

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 4.096V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±0.2%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 80µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 88 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

LM4040B41IDBZTG4 FAQ

1.How can I place an order for LM4040B41IDBZTG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040B41IDBZTG4 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 LM4040B41IDBZTG4 reliable?

The price and inventory of LM4040B41IDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B41IDBZTG4 is usually 5 days.

3.What payment methods are accepted for LM4040B41IDBZTG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B41IDBZTG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040B41IDBZTG4?

LM4040B41IDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040B41IDBZTG4 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 LM4040B41IDBZTG4?

For technical support, including LM4040B41IDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B41IDBZTG4 requirements.

6.How does Aetrix verify that LM4040B41IDBZTG4 is sourced from the original manufacturer or authorized distributors?

All LM4040B41IDBZTG4 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 LM4040B41IDBZTG4 meets industry standards.

7.What is the process for return or replacement of LM4040B41IDBZTG4?

All LM4040B41IDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B41IDBZTG4, 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 LM4040B41IDBZTG4 part is unused and in its original packaging.

Return procedure for LM4040B41IDBZTG4:

1.Submit a request within 90 days.

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

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