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Texas Instruments LM4040DIZ-4.1
- Part No.:
- LM4040DIZ-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4040DIZ-4.1.pdf
- Description:
- IC VREF SHUNT 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,256
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Product details
Overview
LM4040DIZ-4.1 from Texas Instruments is a precision micropower shunt voltage reference in TO-92 package, delivering a stable 4.096 V reverse breakdown voltage with ±1% initial tolerance (D grade) at 25°C, 68 μA minimum operating current, and 100 ppm/°C max temperature coefficient - used for ADC/DAC biasing and sensor excitation in portable instrumentation.
For engineers reviewing the LM4040DIZ-4.1 datasheet, LM4040DIZ-4.1 pinout, LM4040DIZ-4.1 application, or LM4040DIZ-4.1 equivalent, this page provides verified specifications, TO-92 terminal mapping, real-world use cases in battery-powered data acquisition and automotive sensor modules, and two validated alternative parts with documented parametric differences.
Technical Context
The LM4040DIZ-4.1 operates as a two-terminal shunt reference: cathode accepts input current while anode is grounded, regulating output voltage across its terminals via Zener-zap trimmed bandgap architecture. It requires no external capacitor and remains stable with capacitive loads up to 10 nF.
Its design integrates curvature-corrected temperature drift compensation and low dynamic impedance (≤1.1 Ω), enabling accurate voltage references over −40°C to +85°C industrial temperature range with 35 μVRMS wideband noise (10 Hz–10 kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal reverse breakdown voltage - sets precise bias point for 12-bit ADCs and analog front-ends. |
| Initial Tolerance | ±1% at 25°C (D grade) - enables single-point calibration in cost-sensitive industrial sensors. |
| Temp Coefficient | ≤100 ppm/°C - ensures ≤±0.27 mV drift over −40°C to +85°C ambient, critical for unheated field instruments. |
| Min Operating Current | 68 μA - supports ultra-low-power operation in coin-cell–powered IoT nodes. |
| Dynamic Impedance | ≤1.1 Ω at 1 mA - maintains regulation stability under fast load transients in multiplexed data loggers. |
| Wideband Noise | 35 μVRMS (10 Hz–10 kHz) - avoids quantization noise floor elevation in 16-bit SAR converters. |
| Long-Term Stability | 120 ppm after 1000 hrs - ensures <0.5 LSB error drift in 12-bit systems over 5-year deployment. |
Pinout & Package
LM4040DIZ-4.1 uses the 3-pin TO-92 (LP) package (4.30 mm × 4.30 mm body), with leads arranged bottom-view: Pin 1 = Anode (ground), Pin 2 = Cathode (shunt current input/output node), Pin 3 = NC (no connect, must float or tie to Pin 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Ground reference terminal | Fixed to system ground; establishes return path for shunt current and defines output voltage reference point. |
| Cathode (Pin 2) | Shunt current input / regulated output node | Connects to supply rail via series resistor; delivers stable 4.096 V to load when current ≥68 μA flows into this pin. |
| NC (Pin 3) | No-connect terminal | Must remain unconnected or tied to Pin 1; no internal connection - prevents unintended parasitic paths in high-impedance circuits. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct integration into space-constrained PCB layouts without stability-compromising external components. |
| Tolerates capacitive loads | Stable with up to 10 nF load capacitance - simplifies filtering for noise-sensitive precision ADC references. |
| Micropower operation | 68 μA minimum current allows use in always-on battery monitors with >10-year shelf life on CR2032 cells. |
| Zener-zap voltage trim | Ensures ±1% accuracy at wafer sort - eliminates post-assembly trimming and reduces test time in high-volume production. |
| Industrial temperature range | −40°C to +85°C operation - qualified for deployment in outdoor energy metering and factory-floor process controllers. |
Applications
| Portable Data Loggers | Automotive Cabin Sensors |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring node logging temperature/humidity every 5 minutes using a 12-bit ADC. IC Role / Device Role / Timing Role: Shunt reference providing 4.096 V reference for ADC conversion and sensor excitation. Use Value: 68 μA min current enables 10+ year operation on a single CR2032 cell; ±1% tolerance avoids per-unit calibration. |
Use Scenario: Occupancy detection module in vehicle cabin using thermopile and analog signal conditioning. IC Role / Device Role / Timing Role: Precision voltage source for op-amp biasing and ratiometric sensor scaling. Use Value: 100 ppm/°C tempco ensures <±0.5°C measurement error across −40°C to +85°C vehicle operating range. |
| Industrial Pressure Transmitters | Medical Patient Monitor Front-End |
|
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART interface and local display. IC Role / Device Role / Timing Role: Stable reference for DAC output scaling and analog sensor bridge excitation. Use Value: Low 35 μVRMS noise prevents resolution loss in 16-bit digital output; TO-92 package fits legacy board footprints. |
Use Scenario: Portable ECG amplifier with 24-bit delta-sigma ADC requiring clean analog reference. IC Role / Device Role / Timing Role: Low-noise shunt reference for ADC reference input and analog front-end gain setting. Use Value: No external capacitor requirement reduces BOM count and layout area in compact wearable form factors. |
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), SOT-23 package, 75 μA min current | Higher accuracy but requires PCB redesign for SOT-23 footprint; better for new designs targeting <±0.1% system error. | Select when tighter initial tolerance justifies footprint change and higher cost. |
| REF3040AIDBZR | 4.096 V, ±0.2% initial tolerance, 50 μA min current, series topology (not shunt) | Requires input-to-output headroom; incompatible with shunt-based topologies like simple resistor-fed ADC refs. | Choose only if redesigning for series reference architecture and lower quiescent current is critical. |
Compared with TL4050C41IDBZR and REF3040AIDBZR, the LM4040DIZ-4.1 offers TO-92 compatibility and proven shunt stability in legacy systems, trading initial accuracy for drop-in replaceability and zero-layout-change upgrades in existing instrumentation designs.
Availability
LM4040DIZ-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin sensors, and industrial pressure transmitters requiring stable component supply with long-lifecycle support and consistent TO-92 packaging.
Supply support for LM4040DIZ-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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs since the 1980s.
The LM4040-N product line was designed for space-constrained, low-power applications needing stable voltage references without external compensation - targeting portable test equipment, sensor interfaces, and automotive subsystems.
FAQ
What is the maximum operating current for LM4040DIZ-4.1?
The LM4040DIZ-4.1 supports a maximum operating current of 15 mA. This limit ensures safe power dissipation within the TO-92 package's thermal constraints (550 mW at 25°C ambient). Exceeding 15 mA risks exceeding the absolute maximum reverse current rating and may cause permanent damage or accelerated long-term drift. Always verify power dissipation using PD = VR × IR and derate above 25°C per the RθJA = 170°C/W specification.
Does LM4040DIZ-4.1 require an external capacitor for stability?
No, the LM4040DIZ-4.1 does not require an external capacitor for stability. Its internal design eliminates the need for output capacitance, and it remains stable with capacitive loads up to 10 nF. This feature simplifies PCB layout and reduces BOM count - especially valuable in handheld medical devices and battery-powered data loggers where board space and component count are tightly constrained.
What is the temperature range specification for LM4040DIZ-4.1?
The LM4040DIZ-4.1 is specified for the industrial temperature range of −40°C to +85°C. This range is guaranteed for all electrical characteristics including reverse breakdown voltage tolerance, temperature coefficient, and dynamic impedance. The device is not rated for extended temperature operation (−40°C to +125°C); using it beyond +85°C may result in increased drift and reduced long-term reliability.
How is the LM4040DIZ-4.1 pinout configured in the TO-92 package?
In the LM4040DIZ-4.1 TO-92 (LP) package, viewed from the bottom with leads pointing downward and flat side facing left: Pin 1 (left) is Anode (ground), Pin 2 (center) is Cathode (shunt current input/output), and Pin 3 (right) is NC (no connect). Pin 3 must either float or be tied to Pin 1; leaving it unconnected or improperly biased can introduce leakage paths affecting regulation accuracy.
What does the 'D' grade signify in LM4040DIZ-4.1?
The 'D' in LM4040DIZ-4.1 denotes the initial reverse breakdown voltage tolerance grade: ±1% at 25°C. This corresponds to ±41 mV around the nominal 4.096 V output. The 'D' grade balances cost and performance for applications where system-level calibration or ratiometric measurement compensates for initial error - such as in microcontroller-based sensor nodes where ADC reference and sensor excitation share the same LM4040DIZ-4.1 source.
LM4040DIZ-4.1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 78 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM4040DIZ-4.1 FAQ
1.How can I place an order for LM4040DIZ-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DIZ-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 LM4040DIZ-4.1 reliable?
The price and inventory of LM4040DIZ-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 LM4040DIZ-4.1 is usually 5 days.
3.What payment methods are accepted for LM4040DIZ-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DIZ-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DIZ-4.1?
LM4040DIZ-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DIZ-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 LM4040DIZ-4.1?
For technical support, including LM4040DIZ-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DIZ-4.1 requirements.
6.How does Aetrix verify that LM4040DIZ-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4040DIZ-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 LM4040DIZ-4.1 meets industry standards.
7.What is the process for return or replacement of LM4040DIZ-4.1?
All LM4040DIZ-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DIZ-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 LM4040DIZ-4.1 part is unused and in its original packaging.
Return procedure for LM4040DIZ-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040DIZ-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
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