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Texas Instruments LM4050CEM3-2.5
- Part No.:
- LM4050CEM3-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4050CEM3-2.5.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,409
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Product details
Overview
LM4050CEM3-2.5 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, 50 ppm/°C max temperature coefficient, and 41 μVrms wideband noise (10 Hz–10 kHz). It operates from 65 μA to 15 mA over −40°C to 85°C and requires no output capacitor.
For engineers reviewing the LM4050CEM3-2.5 datasheet, LM4050CEM3-2.5 pinout, LM4050CEM3-2.5 application, or LM4050CEM3-2.5 equivalent, key selection criteria include initial voltage accuracy, low-noise performance in battery-powered instrumentation, thermal hysteresis (0.7 mV), dynamic impedance (0.3 Ω), and compatibility with capacitive loads without external stabilization.
Technical Context
The LM4050CEM3-2.5 uses bandgap reference architecture with curvature-corrected temperature drift compensation and Zener-zap trim for high initial accuracy. Its shunt topology sinks current through the cathode to regulate voltage across an external load resistor, enabling simple two-terminal operation.
It features fuse-trimmed reverse breakdown voltage during wafer sort, ensuring ±0.5% (C-grade) tolerance at 25°C. The device maintains stability with any capacitive load and exhibits low dynamic impedance (0.3 Ω at 1 mA), supporting precise low-power analog signal conditioning in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V nominal reverse breakdown voltage at 100 μA test current |
| Initial Tolerance | ±13 mV (±0.5%) at 25°C - defines maximum deviation before temperature or load effects |
| Temp Coefficient | 50 ppm/°C max over −40°C to 85°C - limits voltage drift across industrial temperature range |
| Min Operating Current | 65 μA over full temperature range - minimum cathode current needed to maintain regulation |
| Noise (10 Hz–10 kHz) | 41 μVrms typical - critical for high-resolution ADC references and precision sensor excitation |
| Dynamic Impedance | 0.3 Ω at 1 mA - ensures minimal load-induced voltage variation in varying current conditions |
| Thermal Hysteresis | 0.7 mV over −40°C ↔ 125°C cycle - quantifies non-repeatability after thermal stress |
Pinout & Package
SOT-23 (DBZ) package: 3-pin surface-mount, 2.92 mm × 1.30 mm body size, JEDEC MO-178AC compliant. Cathode (Pin 1) carries shunt current; Anode (Pin 2) is ground reference; Pin 3 is NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage regulation node | Connects to supply via series resistor; voltage at this node is regulated to 2.5 V relative to Anode |
| Anode (Pin 2) | Ground reference terminal | Must be connected to system ground; serves as return path for shunt current and voltage reference point |
| NC (Pin 3) | No internal connection | Left floating or unconnected; no electrical function - must not be tied to any potential |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables ultra-compact layout in portable systems without stability compromises |
| Tolerates capacitive loads | Supports direct connection to ADC input caps or filtering networks without oscillation risk |
| Fixed 2.5 V breakdown | Matches standard DAC/ADC reference rails and simplifies design of 2.5 V precision circuits |
| Low 41 μVrms noise | Preserves SNR in 16-bit+ data acquisition systems where reference noise dominates error budget |
| 65 μA min operating current | Allows use in micropower applications such as wireless sensor nodes with <100 μA sleep current |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 20-bit SAR ADC and battery-powered operation. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.5 V reference for ADC and analog front-end. Use Value: Enables ±0.5% initial accuracy and low 41 μVrms noise to support 100 dB SNR without external filtering or trimming. |
Use Scenario: Industrial PLC analog input module measuring 4–20 mA sensor signals. IC Role / Device Role / Timing Role: Precision reference for current-to-voltage conversion and ADC biasing. Use Value: 50 ppm/°C tempco and 0.7 mV thermal hysteresis ensure repeatable measurements across ambient shifts from −40°C to 85°C. |
| Energy Management | Precision Audio Components |
Use Scenario: Smart meter voltage monitoring channel with long-term calibration stability requirements. IC Role / Device Role / Timing Role: Reference for high-side voltage divider scaling and ADC reference in power quality analysis. Use Value: 120 ppm long-term stability (1000 hrs) and low dynamic impedance (0.3 Ω) minimize drift-induced measurement error over field lifetime. |
Use Scenario: Class-D amplifier feedback network requiring low-noise, stable bias reference. IC Role / Device Role / Timing Role: Reference source for op-amp offset nulling and PWM comparator thresholds. Use Value: Capacitive-load tolerance allows direct integration with local decoupling caps, eliminating need for isolation resistors that degrade PSRR. |
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 2.5 V reference (2.495 V typ), higher 100 μA min current, 0.22 Ω dynamic impedance | Requires two external resistors for fixed 2.5 V; less accurate initial tolerance (±2%) | Choose when adjustable output or lower dynamic impedance is prioritized over guaranteed 2.500 V and micropower operation |
| MAX6008AEUR+T | Fixed 2.5 V shunt reference, ±0.2% (B-grade) tolerance, 20 ppm/°C tempco, 35 μVrms noise | Narrower tempco and lower noise, but 70 μA min current and SOT-23-3 pinout differs (Anode/Cathode swapped) | Choose when tighter tempco and lower noise justify higher cost and board redesign for pinout mismatch |
Compared with TL431CDBZR and MAX6008AEUR+T, the LM4050CEM3-2.5 offers guaranteed 2.500 V output, lowest min operating current (65 μA), and pinout compatibility with legacy LM4050 designs - making it optimal for space- and power-constrained industrial sensing where fixed-voltage simplicity is essential.
Availability
LM4050CEM3-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and energy management applications requiring stable component supply, long-term calibration integrity, and industrial temperature operation.
Supply support for LM4050CEM3-2.5 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and broad industrial portfolio coverage.
The LM4050-N series was designed for high-accuracy, low-power shunt reference applications in space-constrained, battery-operated, and thermally variable environments - targeting instrumentation, process control, and automotive subsystems.
FAQ
What is the guaranteed initial voltage tolerance of LM4050CEM3-2.5 at 25°C?
The LM4050CEM3-2.5 is a C-grade device with a guaranteed initial reverse breakdown voltage tolerance of ±13 mV (±0.5%) at 25°C and 100 μA test current, as specified in Section 6.6 of the SNOS455G datasheet. This tolerance remains valid across its rated industrial temperature range when combined with its 50 ppm/°C max temperature coefficient.
Does LM4050CEM3-2.5 require an external output capacitor for stability?
No, the LM4050CEM3-2.5 does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC input capacitors or filter networks - a key advantage over older shunt references like the TL431. This eliminates layout complexity and saves board space in compact designs.
What is the minimum operating current for LM4050CEM3-2.5 across temperature?
The LM4050CEM3-2.5 requires a minimum cathode current of 65 μA over its full industrial temperature range (−40°C to 85°C), per Section 6.6 of the datasheet. At 25°C, the minimum is 60 μA. This ultra-low current enables use in micropower applications such as battery-backed sensors and energy-harvesting systems.
How does thermal hysteresis affect LM4050CEM3-2.5 in cycling environments?
The LM4050CEM3-2.5 exhibits 0.7 mV thermal hysteresis - defined as the voltage difference measured at 25°C after cycling to −40°C versus after cycling to 125°C. This parameter quantifies non-recoverable voltage shift due to mechanical stress in the die/package, directly impacting repeatability in field-deployed equipment subject to wide ambient swings.
Is LM4050CEM3-2.5 pin-compatible with other LM4050 variants in SOT-23?
Yes, the LM4050CEM3-2.5 shares identical SOT-23 (DBZ) pinout - Cathode (Pin 1), Anode (Pin 2), NC (Pin 3) - with all LM4050-N/-Q1 variants in the same package. This allows drop-in replacement across voltage options (2.048 V, 4.096 V, etc.) and grade variants (A/B/C) without PCB modification, provided the series resistor is recalculated for the new VZ and IMIN.
LM4050CEM3-2.5 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
LM4050CEM3-2.5 FAQ
1.How can I place an order for LM4050CEM3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4050CEM3-2.5 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 LM4050CEM3-2.5 reliable?
The price and inventory of LM4050CEM3-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4050CEM3-2.5 is usually 5 days.
3.What payment methods are accepted for LM4050CEM3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4050CEM3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4050CEM3-2.5?
LM4050CEM3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4050CEM3-2.5 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 LM4050CEM3-2.5?
For technical support, including LM4050CEM3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4050CEM3-2.5 requirements.
6.How does Aetrix verify that LM4050CEM3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4050CEM3-2.5 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 LM4050CEM3-2.5 meets industry standards.
7.What is the process for return or replacement of LM4050CEM3-2.5?
All LM4050CEM3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4050CEM3-2.5, 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 LM4050CEM3-2.5 part is unused and in its original packaging.
Return procedure for LM4050CEM3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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