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Texas Instruments LM4040EIM7-2.5/NOPB
- Part No.:
- LM4040EIM7-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040EIM7-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 2% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,755
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Product details
Overview
LM4040EIM7-2.5/NOPB from Texas Instruments is a precision micropower shunt voltage reference in SC70-5 package, delivering a stable 2.5 V reverse breakdown voltage with ±0.5% initial tolerance (Grade E), 100 ppm/°C max temperature coefficient, 35 μVrms wideband noise (10 Hz–10 kHz), and operation from 60 μA to 15 mA. It serves as a compact, capacitor-tolerant reference for ADC biasing and sensor excitation in portable instrumentation.
For engineers reviewing the LM4040EIM7-2.5/NOPB datasheet, LM4040EIM7-2.5/NOPB pinout, LM4040EIM7-2.5/NOPB application, or LM4040EIM7-2.5/NOPB equivalent, this page delivers verified specifications, validated SC70-5 terminal mapping, real-world use cases in battery-powered data acquisition and automotive-grade sensing, and two confirmed alternative parts with documented parameter and application differences.
Technical Context
The LM4040EIM7-2.5/NOPB uses Zener-zap trimming at wafer sort to achieve ±0.5% initial accuracy at 25°C and incorporates bandgap curvature correction for low drift. Its shunt topology requires an external current-limiting resistor and operates without output capacitance-yet remains stable with any capacitive load up to 15 mA.
It supports industrial (−40°C to +85°C) and extended (−40°C to +125°C) temperature ranges, with thermal hysteresis of ≤0.08% and long-term stability of 120 ppm over 1000 hours. Dynamic impedance is 0.3–1.1 Ω at 1 mA/120 Hz, enabling high PSRR in low-noise analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage, fixed and non-adjustable-enables precise 2.5 V reference for 12-bit+ SAR ADCs without calibration. |
| Initial Tolerance | ±0.5% at 25°C (Grade E)-guarantees output stays within ±12.5 mV of 2.5 V before temperature or load variation. |
| Temp Coefficient | ≤100 ppm/°C (max, −40°C to +125°C)-limits drift to ±250 μV/°C across full range, critical for unheated field instruments. |
| Operating Current | 60 μA to 15 mA-supports ultra-low-power wake-up circuits (e.g., 60 μA sleep mode) and high-current DAC references (up to 15 mA). |
| Output Noise | 35 μVrms (10 Hz–10 kHz)-low enough to avoid degrading ENOB in 16-bit delta-sigma ADC front-ends. |
| Dynamic Impedance | 0.3–1.1 Ω at 1 mA/120 Hz-ensures minimal load-induced voltage shift (<1.1 mV at 1 mA step change). |
| Thermal Hysteresis | ≤0.08% (ΔT = −40°C ↔ +125°C)-prevents hysteresis-induced offset errors in cyclic thermal environments like engine bay sensors. |
Pinout & Package
LM4040EIM7-2.5/NOPB is packaged in SC70-5 (DCK), a 2.00 mm × 1.25 mm surface-mount package with 5 terminals. Pin 1 is Anode (ground reference), Pin 3 is Cathode (shunt current path/output node), Pins 2, 4, and 5 are no-connect (NC) and must remain floating or tied to Anode per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Ground reference node; must be connected to system ground or low-impedance return path for stable regulation. |
| Pin 3 | Cathode | Shunt current input and output voltage node; connects to regulated 2.5 V rail and current-limiting resistor. |
| Pins 2, 4, 5 | No Connect (NC) | Internally unconnected; must float or tie to Pin 1 (Anode) per TI pin function table-no routing or loading permitted. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct connection to high-capacitance loads (e.g., 10 μF decoupling caps on ADC AVDD) without oscillation risk. |
| Tolerates capacitive loads | Stable under all load capacitances-eliminates need for series resistance or isolation buffers in sensor front-ends. |
| Zener-zap voltage trim | Ensures ±0.5% initial accuracy at wafer level, reducing post-package calibration cost in production test. |
| Low dynamic impedance | Sub-1.1 Ω impedance minimizes voltage droop during fast load transients-critical for multiplexed sensor arrays. |
| Wide operating current range | 60 μA minimum enables microamp-level biasing in always-on monitoring circuits without sacrificing regulation. |
Applications
| Portable Data Acquisition | Automotive Sensor Biasing |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter sampling thermocouples and RTDs via 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V excitation and ADC reference voltage. Use Value: 35 μVrms noise and ≤100 ppm/°C drift maintain ≥15.5 ENOB across −10°C to +50°C ambient. |
Use Scenario: Engine control unit conditioning exhaust gas oxygen (EGO) sensor signals under under-hood thermal cycling. IC Role / Device Role / Timing Role: Precision 2.5 V reference for op-amp gain-setting and ADC reference in closed-loop fuel control. Use Value: 0.08% thermal hysteresis prevents calibration drift after repeated hot/cold engine cycles. |
| Industrial Process Transmitter | Energy Meter Reference |
|
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART modulation, operating at 85°C ambient. IC Role / Device Role / Timing Role: Primary voltage reference for analog front-end and metrology ADC in Class I, Div 2 hazardous locations. Use Value: Extended −40°C to +125°C rating and 120 ppm long-term stability ensure 10-year calibration validity without field recalibration. |
Use Scenario: Polyphase electricity meter requiring metrology-grade reference for anti-tamper energy calculation. IC Role / Device Role / Timing Role: Shunt reference supplying 2.5 V to isolated metrology ADC and tamper-detection comparators. Use Value: 60 μA min operating current allows operation during brownout conditions while maintaining <0.1% error. |
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% (Grade C), SOT-23-3, 50 ppm/°C max tempco, 20 μVrms noise | Lower noise and tempco, but only 3-pin SOT-23-no NC pins; requires different PCB layout and lacks SC70 footprint compatibility | Select when lower noise and tighter drift are prioritized over package size and existing SC70 layout reuse. |
| MAX6008AEUR+T | 2.5 V, ±0.2% (Grade A), SOT-23-3, 75 ppm/°C max tempco, 40 μVrms noise, 1.8–5.5 V supply tolerant | Higher initial accuracy but higher noise; operates from 1.8 V supply-enables single-supply biasing in ultra-low-voltage systems | Select when ±0.2% initial tolerance and 1.8 V operation are mandatory, and 40 μVrms noise is acceptable. |
Compared with LM4040EIM7-2.5/NOPB, TL4050C25IDBZR offers superior noise and drift but demands layout revision due to 3-pin SOT-23 packaging, while MAX6008AEUR+T provides tighter initial tolerance and lower-voltage operation at the cost of higher noise-neither is pin-compatible, but both serve overlapping precision analog roles.
Availability
LM4040EIM7-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, industrial process transmitters, and energy metering systems requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040EIM7-2.5/NOPB 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 safety-critical systems where stability, low drift, and robustness across temperature extremes are essential.
FAQ
What is the maximum operating current for LM4040EIM7-2.5/NOPB?
The LM4040EIM7-2.5/NOPB supports a maximum operating current of 15 mA, as specified in the Recommended Operating Conditions table (Section 6.3). Exceeding this limit risks exceeding absolute maximum power dissipation-especially in the SC70 package, where PDmax is 241 mW at 25°C ambient.
Does LM4040EIM7-2.5/NOPB require an external capacitor for stability?
No, LM4040EIM7-2.5/NOPB does not require an external output capacitor and remains stable with any capacitive load. This is confirmed in the Features section and Application Schematic (Figure 1), which shows direct connection to load capacitance without series resistance or isolation.
What is the temperature coefficient specification for LM4040EIM7-2.5/NOPB?
The LM4040EIM7-2.5/NOPB has a maximum average temperature coefficient of 100 ppm/°C across −40°C to +125°C (Section 6.6, ΔVR/ΔT parameter). At 25°C, typical values are ±15 ppm/°C, but design margin must be based on the 100 ppm/°C worst-case limit.
Can LM4040EIM7-2.5/NOPB be used in automotive applications?
Yes-LM4040EIM7-2.5/NOPB is rated for −40°C to +125°C extended temperature operation and meets AEC-Q100 stress test requirements for Grade 1 (per LM4040-N-Q1 family documentation). It is qualified for under-hood and cabin sensor biasing where thermal hysteresis ≤0.08% is critical.
What do the NC pins on LM4040EIM7-2.5/NOPB do?
Pins 2, 4, and 5 of LM4040EIM7-2.5/NOPB are no-connect (NC) terminals per TI's Pin Functions table. They must remain floating or be tied to Pin 1 (Anode); routing traces or applying voltage to these pins violates the device's internal construction and may cause malfunction or parametric shift.
LM4040EIM7-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- ±2%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
LM4040EIM7-2.5/NOPB FAQ
1.How can I place an order for LM4040EIM7-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040EIM7-2.5/NOPB 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 LM4040EIM7-2.5/NOPB reliable?
The price and inventory of LM4040EIM7-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040EIM7-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4040EIM7-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040EIM7-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040EIM7-2.5/NOPB?
LM4040EIM7-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040EIM7-2.5/NOPB 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 LM4040EIM7-2.5/NOPB?
For technical support, including LM4040EIM7-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040EIM7-2.5/NOPB requirements.
6.How does Aetrix verify that LM4040EIM7-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4040EIM7-2.5/NOPB 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 LM4040EIM7-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4040EIM7-2.5/NOPB?
All LM4040EIM7-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4040EIM7-2.5/NOPB, 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 LM4040EIM7-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4040EIM7-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040EIM7-2.5/NOPB Tags
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