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Texas Instruments LM4040EEM3X-2.0
- Part No.:
- LM4040EEM3X-2.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040EEM3X-2.0.pdf
- Description:
- IC VREF SHUNT 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,061
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Product details
Overview
LM4040EEM3X-2.0 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a stable 2.048 V reverse breakdown voltage with ±41 mV (±2.0%) initial tolerance at 25°C, 65 μA minimum operating current, and 150 ppm/°C max temperature coefficient over −40°C to +125°C. It serves as a compact, capacitor-tolerant reference for ADC biasing and sensor excitation in portable instrumentation.
For engineers reviewing the LM4040EEM3X-2.0 datasheet, LM4040EEM3X-2.0 pinout, LM4040EEM3X-2.0 application, or LM4040EEM3X-2.0 equivalent, key selection criteria include industrial/extended temperature operation, low dynamic impedance (<1.1 Ω), wide 65 μA–15 mA current range, and SOT-23 footprint compatibility with space-constrained PCB layouts.
Technical Context
The LM4040EEM3X-2.0 uses Zener-zap trimmed bandgap architecture with curvature-corrected temperature drift compensation, enabling stable 2.048 V output across −40°C to +125°C without external capacitors. Its shunt topology requires only anode-to-ground and cathode-to-bias resistor connection.
It operates as a two-terminal device: cathode sinks current to maintain precise reverse breakdown voltage, while anode is grounded. Thermal hysteresis is limited to 0.08%, and long-term stability is 120 ppm after 1000 hours at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal reverse breakdown voltage - sets accurate reference point for 12-bit ADCs and low-voltage analog circuits. |
| Initial Tolerance | ±41 mV (±2.0%) at 25°C - defines worst-case DC offset in calibration-sensitive systems before temperature effects. |
| Temp Coefficient | Max ±150 ppm/°C over −40°C to +125°C - contributes ≤±15.6 mV error across full extended temperature range. |
| Min Operating Current | 65 μA at full temperature range - enables ultra-low-power operation in battery-backed data loggers. |
| Dynamic Impedance | ≤1.1 Ω at 1 mA - ensures minimal load-induced voltage shift during fast transient current demands. |
| Wideband Noise | 35 μVRMS (10 Hz–10 kHz) - supports high-resolution measurement without added filtering overhead. |
| Operating Current Range | 65 μA to 15 mA - accommodates both micropower sensor interfaces and higher-current reference buffering. |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, 0.95 mm height, gull-wing leads. RoHS-compliant, Pb-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Ground reference terminal | Must be connected to system ground; establishes return path for shunt current and defines voltage reference node. |
| Cathode (Pin 1) | Shunt current input / output voltage node | Sinks current from bias resistor; output voltage appears between cathode and anode - directly connects to ADC REF+ or op-amp inverting input. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must remain floating or tied to anode per TI specification - no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct integration into space-limited designs (e.g., wearable sensors) without stability-compromising external components. |
| Tolerates capacitive loads | Stable with up to 10 nF on cathode - eliminates need for isolation resistors when driving ADC sample-and-hold inputs. |
| Extended temperature range | Rated for −40°C to +125°C operation - suitable for under-hood automotive modules and industrial motor control enclosures. |
| Low dynamic impedance | ≤1.1 Ω ensures <1 mV output shift under 1 mA load transients - critical for maintaining accuracy in multiplexed data acquisition. |
| Zener-zap voltage trim | Laser-trimmed during wafer sort ensures guaranteed ±2.0% initial accuracy - reduces post-manufacturing calibration effort. |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and battery-powered operation. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.048 V for ADC full-scale range and internal DAC calibration. Use Value: Enables ±0.005% measurement accuracy over 0–40°C ambient with no warm-up delay or external filter components. |
Use Scenario: 8-channel thermocouple logger using cold-junction compensation and isolated SPI interface. IC Role / Device Role / Timing Role: Precision reference for thermocouple signal conditioning amplifier and ADC reference rail. Use Value: Maintains <±0.5°C absolute temperature accuracy across −20°C to +70°C enclosure temperature due to low thermal hysteresis (0.08%). |
| Energy Management Units | Automotive Body Control Modules |
Use Scenario: Smart electricity meter with metrology-grade AFE and tamper detection circuitry. IC Role / Device Role / Timing Role: Reference for current-sense amplifier gain setting and voltage divider scaling in power monitoring path. Use Value: Delivers consistent 2.048 V despite 100 μA–12 mA supply current variation - eliminating gain drift in revenue-grade energy calculations. |
Use Scenario: Door module with window lift control, LED status indicators, and LIN bus communication. IC Role / Device Role / Timing Role: Voltage reference for microcontroller ADC measuring battery voltage and motor current feedback. Use Value: Operates reliably at 125°C junction temperature with <±20 mV total error - ensuring correct overvoltage shutdown decisions under hood conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | Adjustable 2.5 V reference (2.495 V ±0.5%), 3-pin SO-8, higher quiescent current (1 mA min), 0.22 Ω dynamic impedance | Requires external resistor network for 2.048 V; better for programmable references but larger footprint and higher power | Choose when adjustable output or lower dynamic impedance is prioritized over size and micropower operation |
| MAX6002EUR+T | Fixed 2.048 V shunt reference, SOT-23-3, ±0.1% initial tolerance (A grade), 75 ppm/°C tempco, 60 μA min current | Higher accuracy and lower tempco, but rated only for −40°C to +85°C industrial range | Choose for lab-grade instrumentation where extended temperature operation is not required and tighter initial tolerance is critical |
Compared with TL431ACDBVR and MAX6002EUR+T, the LM4040EEM3X-2.0 uniquely balances SOT-23-3 size, extended −40°C to +125°C rating, and micropower capability - making it optimal for automotive and industrial edge nodes where board area, temperature resilience, and battery life are jointly constrained.
Availability
LM4040EEM3X-2.0 is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4040EEM3X-2.0 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of leadership in precision reference design and automotive-qualified components.
The LM4040-N family was engineered for space-constrained, high-stability applications demanding micropower operation and robust temperature performance - targeting portable test equipment, industrial sensors, and automotive subsystems.
FAQ
What is the maximum operating temperature range for the LM4040EEM3X-2.0?
The LM4040EEM3X-2.0 is specified for operation from −40°C to +125°C (Grade E temperature range). This extended range is validated per TI's electrical characteristics tables for the E-grade variant and supports under-hood automotive and industrial environments where junction temperatures may exceed 105°C. The LM4040EEM3X-2.0 maintains its ±70 mV overtemperature tolerance and ≤1.1 Ω dynamic impedance across this full span.
Does the LM4040EEM3X-2.0 require an external capacitor for stability?
No, the LM4040EEM3X-2.0 does not require an external output capacitor for stability. Its internal design eliminates the need for stabilization components while remaining stable with any capacitive load up to 10 nF. This simplifies layout and reduces BOM count in space-constrained applications like handheld meters and sensor nodes - a verified behavior documented in TI's LM4040-N datasheet Section 3 and Figure 9-1.
What is the minimum cathode current needed for the LM4040EEM3X-2.0 to regulate accurately?
The LM4040EEM3X-2.0 requires a minimum cathode current of 65 μA across its full −40°C to +125°C operating range to maintain regulation within specifications. At 25°C, the minimum is 60 μA. This value is confirmed in Table 6.7 (Electrical Characteristics for 2-V LM4040-N, Grade E, Temperature Grade E) of the TI datasheet. Below this threshold, output voltage deviates beyond the ±2.0% initial tolerance band.
How does the LM4040EEM3X-2.0 compare to the LM4040AIM3X-2.0 in terms of accuracy?
The LM4040EEM3X-2.0 has ±41 mV (±2.0%) initial tolerance at 25°C and ±70 mV over −40°C to +125°C, whereas the LM4040AIM3X-2.0 offers ±2 mV (±0.1%) at 25°C and ±15 mV over −40°C to +85°C. The LM4040EEM3X-2.0 trades initial accuracy for extended temperature range and cost efficiency - making it appropriate for applications where environmental resilience outweighs sub-0.1% calibration needs. Both share identical SOT-23-3 packaging and pinout.
Can the LM4040EEM3X-2.0 be used in place of a 2.0 V Zener diode?
Yes, the LM4040EEM3X-2.0 can replace discrete 2.0 V Zener diodes in most applications, offering superior performance: tighter voltage tolerance (±2.0% vs typical ±5–10%), lower dynamic impedance (≤1.1 Ω vs 10–100 Ω), and guaranteed temperature stability (±150 ppm/°C vs uncharacterized Zener drift). Its SOT-23-3 footprint matches common Zener packages, and the LM4040EEM3X-2.0 requires no derating for temperature or current - unlike conventional Zeners.
LM4040EEM3X-2.0 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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 73 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040EEM3X-2.0 FAQ
1.How can I place an order for LM4040EEM3X-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040EEM3X-2.0 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 LM4040EEM3X-2.0 reliable?
The price and inventory of LM4040EEM3X-2.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040EEM3X-2.0 is usually 5 days.
3.What payment methods are accepted for LM4040EEM3X-2.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040EEM3X-2.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040EEM3X-2.0?
LM4040EEM3X-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040EEM3X-2.0 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 LM4040EEM3X-2.0?
For technical support, including LM4040EEM3X-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040EEM3X-2.0 requirements.
6.How does Aetrix verify that LM4040EEM3X-2.0 is sourced from the original manufacturer or authorized distributors?
All LM4040EEM3X-2.0 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 LM4040EEM3X-2.0 meets industry standards.
7.What is the process for return or replacement of LM4040EEM3X-2.0?
All LM4040EEM3X-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040EEM3X-2.0, 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 LM4040EEM3X-2.0 part is unused and in its original packaging.
Return procedure for LM4040EEM3X-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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