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Texas Instruments LM4050CEM3X-2.5
- Part No.:
- LM4050CEM3X-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4050CEM3X-2.5.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,870
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Product details
Overview
LM4050CEM3X-2.5 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23 package, delivering a stable 2.5 V reverse breakdown voltage with ±13 mV (±0.5%) initial tolerance at 25°C, 41 μVrms wideband noise (10 Hz–10 kHz), and 50 ppm/°C max temperature coefficient across −40°C to 125°C. It operates from 65 μA to 15 mA, enabling use in low-power analog sensing and ADC biasing circuits.
For engineers reviewing the LM4050CEM3X-2.5 datasheet, LM4050CEM3X-2.5 pinout, LM4050CEM3X-2.5 application, or LM4050CEM3X-2.5 equivalent, key selection criteria include its grade-C tolerance, no-output-capacitor-required stability, capacitive-load tolerance, industrial/extended temperature support, and SOT-23 footprint compatibility with space-constrained portable and instrumentation designs.
Technical Context
The LM4050CEM3X-2.5 uses bandgap-based Zener-zap trimmed shunt regulation with curvature-corrected temperature drift compensation, ensuring stable 2.5 V reference under varying load and temperature. Its dynamic impedance is 0.3 Ω at 1 mA, supporting tight regulation even with fast load transients.
It requires no external output capacitor and remains stable with any capacitive load - a critical advantage over older shunt references. The device achieves ±0.5% initial accuracy via wafer-level fuse trimming and maintains long-term stability of ≤120 ppm over 1000 hours at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V nominal; fixed reverse breakdown voltage for precision biasing and ADC/DAC reference |
| Initial Tolerance (25°C) | ±13 mV (±0.5%); Grade-C specification per LM4050CEM3X-2.5 ordering code |
| Temp Coefficient (max) | 50 ppm/°C over −40°C to 125°C; ensures < ±11 mV total drift across full extended range |
| Operating Current Range | 65 μA to 15 mA; supports ultra-low-power sensor nodes and high-current reference buffering |
| Output Noise (10 Hz–10 kHz) | 41 μVrms; low enough for 16-bit+ data acquisition without additional filtering |
| Dynamic Impedance | 0.3 Ω at 1 mA; enables < 1 mV load regulation error over 1 mA step changes |
| Long-Term Stability | ≤120 ppm after 1000 hrs; predictable aging behavior for mission-critical calibration systems |
Pinout & Package
SOT-23 (DBZ) package: 3-pin surface-mount, body size 2.92 mm × 1.30 mm, thermal resistance RθJA = 287°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connects to supply rail; sinks all reference current plus load current; sets regulated voltage at this node |
| Anode (Pin 2) | Common return / ground reference | Must be connected to system ground; forms the 2.5 V reference potential relative to this pin |
| NC (Pin 3) | No internal connection | Left floating or tied to Anode (Pin 2); no electrical function - not a control or feedback pin |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Eliminates BOM cost and board area for stabilization; simplifies layout in space-constrained designs |
| Tolerates capacitive loads | Stable with any value of output capacitance - enables direct driving of ADC sample capacitors or op-amp inputs |
| Fixed 2.5 V breakdown voltage | Matches standard DAC/ADC full-scale ranges and microcontroller VREF inputs without scaling resistors |
| Wide operating current range | 65 μA min enables battery-life extension in sleep modes; 15 mA max supports active reference buffering |
| Grade-C industrial/extended temp support | Specified from −40°C to +125°C with guaranteed 50 ppm/°C TC - suitable for automotive under-hood and industrial PLC modules |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and lithium coin-cell power supply. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V VREF for ADC conversion and analog front-end biasing. Use Value: Enables 0.5% absolute accuracy without calibration; 41 μVrms noise avoids SNR degradation in DC measurements. |
Use Scenario: Modular DAQ module sampling 8 channels at 100 kSPS with simultaneous sampling. IC Role / Device Role / Timing Role: Common reference source shared across multiple ADCs and signal-conditioning amplifiers. Use Value: Low dynamic impedance (0.3 Ω) prevents crosstalk-induced reference droop during multi-channel switching. |
| Energy Monitoring Sensors | Automotive Body Control Modules |
Use Scenario: DIN-rail-mounted smart meter measuring AC line voltage/current with isolation. IC Role / Device Role / Timing Role: Precision shunt reference for isolated sigma-delta ADCs measuring RMS values. Use Value: Long-term stability ≤120 ppm ensures metrology-grade calibration retention over 10-year field life. |
Use Scenario: Under-dash BCM monitoring battery voltage, cabin temperature, and door switch status. IC Role / Device Role / Timing Role: Reference for MCU's internal ADC and external sensor signal conditioning. Use Value: Extended −40°C to +125°C operation and AEC-Q100-compatible design ensure reliability in harsh automotive environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | Adjustable 2.495 V reference; requires two external resistors; higher 22 Ω dynamic impedance | Used where programmability or tighter initial tolerance (±1%) is needed; less suitable for ultra-low-noise 16-bit systems | Select when adjustable output or lower cost is prioritized over noise and dynamic impedance performance |
| MAX6008AEUR+T | Fixed 2.5 V; ±0.2% initial tolerance (Grade-A); 25 μVrms noise; SOT-23-3 but higher quiescent current (80 μA min) | Better noise and accuracy than LM4050CEM3X-2.5, but narrower current range limits ultra-low-power use cases | Select when highest noise-sensitive accuracy is required and minimum operating current >80 μA is acceptable |
Compared with TL431CDBZR and MAX6008AEUR+T, the LM4050CEM3X-2.5 offers the best balance of ultra-low noise (41 μVrms), wide current range (65 μA–15 mA), and zero external component requirement - making it optimal for compact, battery-powered, and high-resolution measurement systems where layout simplicity and long-term stability are critical.
Availability
LM4050CEM3X-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, energy monitoring sensors, and automotive body control modules requiring stable component supply across industrial and extended temperature grades.
Supply support for LM4050CEM3X-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 high-reliability manufacturing.
The LM4050-N series was engineered for space-constrained, low-power precision applications - delivering factory-trimmed shunt references with no external capacitor requirements and robust performance across automotive, industrial, and instrumentation markets.
FAQ
What is the initial output voltage tolerance of the LM4050CEM3X-2.5 at 25°C?
The LM4050CEM3X-2.5 has a Grade-C initial tolerance of ±13 mV (±0.5%) at 25°C, as specified in Section 6.6 of the SNOS455G datasheet. This tolerance applies to the nominal 2.500 V reverse breakdown voltage under 100 μA test current and is verified during wafer sort using Zener-zap trimming.
Does the LM4050CEM3X-2.5 require an external output capacitor for stability?
No, the LM4050CEM3X-2.5 does not require an external output capacitor. Its internal design ensures unconditional stability with any capacitive load - a key differentiator confirmed in the "Features" and "Description" sections of the TI datasheet. This eliminates layout constraints and reduces BOM count.
What is the minimum operating current for the LM4050CEM3X-2.5 across temperature?
The LM4050CEM3X-2.5 requires a minimum operating current of 65 μA over the full −40°C to +125°C temperature range, per Section 6.6 Electrical Characteristics. At 25°C, the typical minimum is 41 μA, but design must accommodate the worst-case 65 μA to guarantee regulation.
How does the LM4050CEM3X-2.5 compare to the LM4050AIM3X-2.5 in terms of accuracy?
The LM4050CEM3X-2.5 (Grade-C) has ±13 mV (±0.5%) initial tolerance, while the LM4050AIM3X-2.5 (Grade-A) offers ±2.5 mV (±0.1%). Both share identical 50 ppm/°C max temperature coefficient and 41 μVrms noise, but the A-grade version provides tighter initial accuracy for high-precision calibration applications.
Is the LM4050CEM3X-2.5 qualified for automotive applications?
The LM4050CEM3X-2.5 is not AEC-Q100 qualified. For automotive use, TI offers the LM4050-N-Q1 series (e.g., LM4050CQEM3X-2.5), which is AEC-Q100 Grade 1 qualified and manufactured on an automotive-grade flow - the LM4050CEM3X-2.5 is rated for industrial and extended temperature operation only.
LM4050CEM3X-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:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 41µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4050CEM3X-2.5 FAQ
1.How can I place an order for LM4050CEM3X-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4050CEM3X-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 LM4050CEM3X-2.5 reliable?
The price and inventory of LM4050CEM3X-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 LM4050CEM3X-2.5 is usually 5 days.
3.What payment methods are accepted for LM4050CEM3X-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4050CEM3X-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4050CEM3X-2.5?
LM4050CEM3X-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4050CEM3X-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 LM4050CEM3X-2.5?
For technical support, including LM4050CEM3X-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4050CEM3X-2.5 requirements.
6.How does Aetrix verify that LM4050CEM3X-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4050CEM3X-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 LM4050CEM3X-2.5 meets industry standards.
7.What is the process for return or replacement of LM4050CEM3X-2.5?
All LM4050CEM3X-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4050CEM3X-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 LM4050CEM3X-2.5 part is unused and in its original packaging.
Return procedure for LM4050CEM3X-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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