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Texas Instruments LM4040CEM3-2.5
- Part No.:
- LM4040CEM3-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040CEM3-2.5.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,080
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Product details
Overview
LM4040CEM3-2.5 from Texas Instruments is a precision micropower shunt voltage reference delivering a stable 2.5 V reverse breakdown voltage with ±10 mV (±0.4%) initial tolerance at 25°C, 60 μA to 15 mA operating current range, and 100 ppm/°C max temperature coefficient - used in high-accuracy ADC/DAC biasing, portable instrumentation, and battery-powered sensor signal conditioning.
For engineers reviewing the LM4040CEM3-2.5 datasheet, LM4040CEM3-2.5 pinout, LM4040CEM3-2.5 application, or LM4040CEM3-2.5 equivalent, this page provides verified package mapping (SOT-23), confirmed shunt topology operation, real-world noise (35 μVrms), thermal hysteresis (0.08%), and validated alternatives for industrial and extended-temperature designs.
Technical Context
The LM4040CEM3-2.5 operates as a two-terminal shunt reference: cathode accepts input current and regulates output voltage at cathode-to-anode potential; anode is grounded. It uses Zener-zap trimming and bandgap curvature correction to achieve tight initial accuracy and low drift across −40°C to +125°C.
No external capacitor is required for stability, and it tolerates capacitive loads up to 10 nF. Its 0.9 Ω typical dynamic impedance (at 1 mA) and 35 μVrms wideband noise (10 Hz–10 kHz) support high-resolution data acquisition systems requiring low-noise, low-drift references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage - sets precise bias point for analog front-ends and reference buffers. |
| Initial Tolerance | ±10 mV (±0.4%) at 25°C - enables single-point calibration in production test without trimming. |
| Temp Coefficient | ≤100 ppm/°C over −40°C to +125°C - ensures ≤±25 mV total drift across full extended temperature range. |
| Operating Current | 60 μA to 15 mA - supports ultra-low-power sensor nodes and high-current reference buffering. |
| Dynamic Impedance | 0.9 Ω typical at 1 mA - minimizes load-induced voltage shift in varying-current applications. |
| Output Noise | 35 μVrms (10 Hz–10 kHz) - meets SNR requirements for 16-bit+ data converters. |
| Thermal Hysteresis | 0.08% - limits repeatability error after thermal cycling in field-deployed equipment. |
Pinout & Package
SOT-23 (DBZ) 3-pin surface-mount package: 2.92 mm × 1.30 mm body, gull-wing leads, JEDEC MO-178 compatible. Anode (pin 2) grounded; cathode (pin 1) carries shunt current and defines regulated voltage node; pin 3 is NC (no connect), must float or tie to anode per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / regulated voltage output | Connects to supply rail via series resistor; voltage at this node is stabilized at 2.5 V relative to anode. |
| Anode (Pin 2) | Reference ground terminal | Must be connected to system ground; forms return path for shunt current and defines 0 V reference plane. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; must remain floating or tied to pin 2 (anode) - not used for signal or power routing. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Guaranteed stability with zero external capacitance - reduces BOM count and PCB area in space-constrained designs. |
| Tolerates capacitive loads | Stable with up to 10 nF load capacitance - enables direct driving of ADC reference inputs and op-amp non-inverting inputs. |
| Zener-zap trimmed accuracy | Fuse-based wafer-sort trimming achieves ±10 mV initial tolerance without post-package adjustment. |
| Extended temperature range | Specified from −40°C to +125°C - qualified for under-hood automotive and industrial control environments. |
| Low quiescent current | 60 μA minimum operating current - extends battery life in always-on IoT sensors and portable meters. |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 20-bit SAR ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V reference for ADC and analog multiplexer biasing. Use Value: ±10 mV initial tolerance and 35 μVrms noise enable <1 LSB error at 20-bit resolution without calibration. |
Use Scenario: 4-channel isolated industrial DAQ module sampling thermocouples and RTDs. IC Role / Device Role / Timing Role: Primary reference for programmable gain instrumentation amplifier and sigma-delta ADC. Use Value: 100 ppm/°C tempco and 0.08% thermal hysteresis ensure repeatable measurements across ambient shifts and power cycles. |
| Energy Management | Automotive Body Control |
Use Scenario: Smart electricity meter with metrology-grade AFE and tamper detection. IC Role / Device Role / Timing Role: Precision reference for current-sense amplifier and voltage-monitoring comparators. Use Value: 60 μA min current and SOT-23 footprint allow integration into compact, sealed meter modules with 10-year battery life. |
Use Scenario: Door module monitoring window lift position, mirror fold/unfold, and interior lighting dimming. IC Role / Device Role / Timing Role: Voltage reference for microcontroller ADC measuring potentiometer wiper position and supply rail health. Use Value: −40°C to +125°C operation and AEC-Q200-compatible SOT-23 package meet automotive environmental and reliability standards. |
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% (±12.5 mV) initial tolerance, 75 ppm/°C max tempco, 60 μA–15 mA range, same SOT-23-3 package. | Higher initial tolerance and lower tempco; optimized for cost-sensitive industrial controls rather than high-accuracy metrology. | Select when ±0.5% tolerance suffices and lower procurement cost is prioritized over sub-0.1% calibration headroom. |
| MAX6008BEUR+T | 2.5 V, ±0.2% (±5 mV) initial tolerance, 50 ppm/°C max tempco, 10 μA–10 mA range, SOT-23-3 package. | Lower quiescent current floor (10 μA) but narrower max current (10 mA); better for ultra-low-power sleep modes. | Select for battery-powered devices needing <10 μA standby current, accepting reduced drive capability for ADC buffers. |
Compared with TL4050C25IDBZR and MAX6008BEUR+T, the LM4040CEM3-2.5 offers tighter initial tolerance than the TL4050 while supporting higher load current than the MAX6008 - making it optimal for applications balancing accuracy, drive strength, and extended-temperature robustness.
Availability
LM4040CEM3-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and automotive body control modules requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040CEM3-2.5 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-qualified components.
The LM4040-N product line delivers micropower shunt references optimized for space-constrained, battery-operated, and high-reliability applications - emphasizing low noise, wide temperature operation, and no-capacitor stability.
FAQ
What is the maximum operating temperature for the LM4040CEM3-2.5?
The LM4040CEM3-2.5 is rated for operation from −40°C to +125°C (Grade E). This extended temperature range is fully specified in its Electrical Characteristics table (Section 6.7), including parameters like reverse breakdown voltage tolerance, dynamic impedance, and temperature coefficient - making it suitable for under-hood automotive and industrial control applications where ambient temperatures exceed 85°C.
Does the LM4040CEM3-2.5 require an external capacitor for stability?
No, the LM4040CEM3-2.5 does not require an external capacitor for stability. Its internal design eliminates the need for output capacitance, and it remains stable even with capacitive loads up to 10 nF. This is explicitly confirmed in the Features section and Application Schematic of the official TI datasheet (SNOS633K), reducing design complexity and PCB area in compact layouts.
What is the minimum operating current for the LM4040CEM3-2.5?
The LM4040CEM3-2.5 has a minimum operating current of 60 μA at 25°C, rising to 68 μA across the full −40°C to +125°C range. This value is specified in Section 6.7 (Electrical Characteristics for 2-V LM4040-N, Grade E) and is critical for ensuring regulation in ultra-low-power applications such as battery-backed sensors and energy-harvesting systems.
How is pin 3 used on the LM4040CEM3-2.5 SOT-23 package?
Pin 3 of the LM4040CEM3-2.5 is a no-connect (NC) terminal. Per TI's Pin Functions table and datasheet guidance, it must either remain floating or be tied to pin 2 (anode). It is not internally bonded and carries no electrical function - incorrect connection to voltage rails or signals may compromise performance or reliability.
What does the 'E' grade signify in LM4040CEM3-2.5?
The 'E' in LM4040CEM3-2.5 denotes the temperature grade (−40°C to +125°C) and the initial voltage tolerance grade (±2% at 25°C for the base LM4040-E family; however, the C-grade variant - 'C' in LM4040CEM3-2.5 - specifies ±0.5% initial tolerance, i.e., ±10 mV). The 'E' suffix confirms extended-temperature qualification, while 'C' reflects the tighter ±0.5% tolerance bin - both are production-tested and documented in Section 6.7 of SNOS633K.
LM4040CEM3-2.5 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:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 68 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040CEM3-2.5 FAQ
1.How can I place an order for LM4040CEM3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CEM3-2.5 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 LM4040CEM3-2.5 reliable?
The price and inventory of LM4040CEM3-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CEM3-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040CEM3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CEM3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CEM3-2.5?
LM4040CEM3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CEM3-2.5 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 LM4040CEM3-2.5?
For technical support, including LM4040CEM3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CEM3-2.5 requirements.
6.How does Aetrix verify that LM4040CEM3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040CEM3-2.5 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 LM4040CEM3-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040CEM3-2.5?
All LM4040CEM3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CEM3-2.5, 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 LM4040CEM3-2.5 part is unused and in its original packaging.
Return procedure for LM4040CEM3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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