My Inquiry
My Account
Texas Instruments LM4040AIM3-4.1
- Part No.:
- LM4040AIM3-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040AIM3-4.1.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:592
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4040AIM3-4.1 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a stable 4.096 V reverse breakdown voltage with ±0.1% initial tolerance (A grade) at 25°C, 68 μA minimum operating current, and 100 ppm/°C max temperature coefficient - used for ADC/DAC biasing, sensor excitation, and portable instrumentation power rails.
For engineers reviewing the LM4040AIM3-4.1 datasheet, LM4040AIM3-4.1 pinout, LM4040AIM3-4.1 application, or LM4040AIM3-4.1 equivalent, this page provides verified electrical specs, thermal behavior, SOT-23 terminal mapping, real-world use cases, and two validated alternative parts for design flexibility under industrial temperature conditions (−40°C to +85°C).
Technical Context
The LM4040AIM3-4.1 operates as a two-terminal shunt reference: cathode sinks current while anode connects to ground, enabling simple series-resistor biasing without output capacitor requirements. Its bandgap-derived Zener-zap trimmed structure ensures low dynamic impedance (0.8 Ω typical at 1 mA) and curvature-corrected temperature drift.
It maintains stability across 68 μA–15 mA operating current and −40°C to +85°C ambient range, with 35 μVrms wideband noise (10 Hz–10 kHz) and 0.08% thermal hysteresis after −40°C/125°C cycling - critical for high-resolution data acquisition where reference drift directly impacts measurement accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal reverse breakdown voltage - matches common 12-bit DAC/ADC full-scale references and enables exact binary-scaled voltage generation. |
| Initial Tolerance | ±0.1% at 25°C (A grade) - translates to ±4.1 mV absolute error, sufficient for 12-bit systems requiring ≤0.025% FS accuracy. |
| Temp Coefficient | ≤100 ppm/°C over −40°C to +85°C - contributes ≤±6.5 mV drift across industrial range, preserving calibration integrity. |
| Min Operating Current | 68 μA at 25°C - allows ultra-low-power operation in battery-backed sensors and energy-harvesting nodes. |
| Dynamic Impedance | 0.8 Ω typical at 1 mA - minimizes load-induced voltage shift during fast current transients in multiplexed analog front-ends. |
| Wideband Noise | 35 μVrms (10 Hz–10 kHz) - supports 16-bit effective resolution when paired with low-noise amplifiers and proper PCB layout. |
| Thermal Hysteresis | 0.08% - ensures repeatable voltage output after thermal cycling, essential for field-deployed test equipment. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, gull-wing leads, JEDEC standard footprint compatible with automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Must be connected to system ground; serves as return path for shunt current and defines reference potential. |
| Cathode (Pin 1) | Shunt current input / output voltage node | Connects to supply rail via series resistor; voltage at this pin is regulated 4.096 V relative to anode. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must remain floating or tied to anode per TI specification - no signal routing allowed. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Enables direct integration into space-constrained layouts without stability-compromising bypass components. |
| Tolerates capacitive loads | Stable with up to 10 nF load capacitance - eliminates need for isolation resistors in ADC reference inputs. |
| Fuse-and-Zener-zap trimming | Ensures ±0.1% initial accuracy at wafer sort, reducing post-manufacturing calibration effort. |
| Low quiescent current | 68 μA minimum operating current extends battery life in portable multimeters and handheld analyzers. |
| Industrial temperature range | Specified performance from −40°C to +85°C - suitable for factory-floor PLC modules and outdoor environmental monitors. |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
|
Use Scenario: Handheld digital multimeter requiring stable 4.096 V reference for 12-bit SAR ADC scaling. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise, low-drift excitation for ADC internal gain stages. Use Value: ±0.1% initial tolerance and 100 ppm/°C TC ensure <0.05% total error across battery-operated field use, eliminating recalibration between measurements. |
Use Scenario: Industrial 16-channel analog input module sampling thermocouples and RTDs. IC Role / Device Role / Timing Role: Shared reference source for multiple 24-bit delta-sigma ADCs, minimizing channel-to-channel gain mismatch. Use Value: 35 μVrms noise and 0.8 Ω dynamic impedance prevent reference coupling into sensitive analog inputs, preserving ENOB. |
| Process Control Sensors | Precision Audio Biasing |
|
Use Scenario: Loop-powered 4–20 mA transmitter with onboard temperature compensation circuitry. IC Role / Device Role / Timing Role: Stable excitation source for bridge-based pressure sensors and ratiometric signal conditioning. Use Value: 68 μA min current allows operation within tight 3.5 mA loop budget while maintaining 4.096 V accuracy across −40°C to +85°C. |
Use Scenario: High-fidelity audio CODEC requiring clean 4.096 V bias for microphone preamplifier DC offset control. IC Role / Device Role / Timing Role: Low-noise voltage reference for analog signal chain biasing and DAC output buffering. Use Value: Sub-40 μVrms noise floor prevents audible hiss modulation, and zero-output-capacitor design avoids phase-shift artifacts in feedback paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C41IDBZR | 4.096 V, ±0.5% initial tolerance (C grade), 100 μA min current, SOIC-3 package | Higher initial error and larger footprint; suited for cost-sensitive non-critical references | Select when ±0.5% tolerance is acceptable and board space permits SOIC-3 mounting. |
| REF3040AIDBZR | 4.096 V, ±0.2% initial tolerance, 50 μA min current, SOT-23-3, but series topology (not shunt) | Requires different biasing network; higher output impedance limits high-speed load transient response | Choose only if system architecture mandates three-terminal series reference and load regulation >10 mV is tolerable. |
Compared with TL4050C41IDBZR and REF3040AIDBZR, the LM4040AIM3-4.1 delivers superior initial accuracy and lower operating current in identical SOT-23-3 footprint, making it optimal for high-precision, low-power shunt reference roles where layout compatibility and minimal external components are mandatory.
Availability
LM4040AIM3-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and process control sensors requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LM4040AIM3-4.1 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 automotive-grade reliability validation.
The LM4040-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and industrial-grade measurement systems demanding high initial accuracy and low thermal drift.
FAQ
What is the maximum operating current for LM4040AIM3-4.1?
The LM4040AIM3-4.1 supports a maximum operating current of 15 mA, as specified in the Recommended Operating Conditions table. This limit ensures safe power dissipation within the SOT-23 package's 306 mW rating at 25°C ambient. Exceeding 15 mA risks thermal overload and long-term reliability degradation, especially above 85°C ambient.
Does LM4040AIM3-4.1 require an output capacitor for stability?
No, the LM4040AIM3-4.1 does not require an output capacitor for stability. Its internal design eliminates the need for external stabilization, and it remains stable even with capacitive loads up to 10 nF - a key advantage over older shunt references that mandate careful capacitor selection to avoid oscillation.
What is the thermal hysteresis specification for LM4040AIM3-4.1?
The LM4040AIM3-4.1 exhibits 0.08% thermal hysteresis, defined as the voltage difference measured at 25°C after cycling from −40°C and from +125°C. This low hysteresis ensures repeatable reference output in field-deployed equipment subject to repeated thermal stress, such as outdoor environmental sensors or automotive diagnostic tools.
Can LM4040AIM3-4.1 be used in automotive applications?
The LM4040AIM3-4.1 is rated for industrial temperature range (−40°C to +85°C) and is not AEC-Q200 qualified. For automotive applications, TI offers the LM4040-N-Q1 variant (e.g., LM4040QAIM3-4.1), which meets AEC-Q100 Grade 3 requirements and undergoes additional qualification testing - LM4040AIM3-4.1 itself is not approved for automotive safety-critical systems.
What is the reverse dynamic impedance of LM4040AIM3-4.1 at 1 mA?
The reverse dynamic impedance of LM4040AIM3-4.1 is 0.8 Ω typical at 1 mA operating current and 120 Hz frequency, per Electrical Characteristics Table 6.5. This low impedance ensures minimal voltage shift during load current transients, supporting accurate ratiometric measurements in multiplexed sensor interfaces.
LM4040AIM3-4.1 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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 73 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040AIM3-4.1 FAQ
1.How can I place an order for LM4040AIM3-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040AIM3-4.1 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 LM4040AIM3-4.1 reliable?
The price and inventory of LM4040AIM3-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040AIM3-4.1 is usually 5 days.
3.What payment methods are accepted for LM4040AIM3-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040AIM3-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040AIM3-4.1?
LM4040AIM3-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040AIM3-4.1 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 LM4040AIM3-4.1?
For technical support, including LM4040AIM3-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040AIM3-4.1 requirements.
6.How does Aetrix verify that LM4040AIM3-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4040AIM3-4.1 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 LM4040AIM3-4.1 meets industry standards.
7.What is the process for return or replacement of LM4040AIM3-4.1?
All LM4040AIM3-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040AIM3-4.1, 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 LM4040AIM3-4.1 part is unused and in its original packaging.
Return procedure for LM4040AIM3-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040AIM3-4.1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
