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Texas Instruments LM4128CMFX-2.0
- Part No.:
- LM4128CMFX-2.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMFX-2.0.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,882
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Product details
Overview
LM4128CMFX-2.0 from Texas Instruments (formerly National Semiconductor) is a precision micropower series voltage reference in SOT-23-5 package, delivering 2.048 V output with ±0.5% initial accuracy and 100 ppm/°C temperature coefficient over −40°C to +125°C. It features 60 µA quiescent current, 400 mV dropout at 10 mA, enable pin for 3 µA shutdown, and stable operation with up to 10 µF capacitive load - ideal for battery-powered instrumentation and portable data acquisition.
For engineers reviewing the LM4128CMFX-2.0 datasheet, LM4128CMFX-2.0 pinout, LM4128CMFX-2.0 application, or LM4128CMFX-2.0 equivalent, key selection criteria include output accuracy vs. temperature drift trade-offs, low-quiescent-current operation in space-constrained designs, enable-controlled power cycling, and compatibility with ceramic bypass capacitors without external stabilization.
Technical Context
The LM4128CMFX-2.0 employs an advanced band-gap–derived reference core optimized for micropower operation and low thermal hysteresis (75 ppm). Its series architecture eliminates idle current waste typical of shunt references, enabling efficient use in low-load or intermittent-duty systems.
It integrates an internal enable circuit with 35%–65% VIN logic thresholds, supports input voltages from 2.448 V to 5.5 V (VREF + 400 mV min), and maintains regulation under load currents up to 20 mA while rejecting line variations at 30 ppm/V and load variations at 25–120 ppm/mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; precise match for 12-bit DACs/ADCs with 2n scaling |
| Initial Accuracy | ±0.5% at 25°C (C grade); enables <1 LSB error in 10-bit systems without calibration |
| Tempco | 100 ppm/°C max (−40°C to +125°C); contributes ≤208 µV drift across full range |
| Quiescent Current | 60 µA typical; supports >1-year battery life in 10 µA-average-power IoT sensors |
| Dropout Voltage | 400 mV max at 10 mA; allows operation from single-cell Li-ion (3.0 V min) or 3.3 V rails with margin |
| Enable Shutdown Current | 3 µA max; reduces system standby power by >95% vs active mode |
| Noise (0.1–10 Hz) | 190 µVPP; suitable for 16-bit SAR ADCs with <0.5 LSB noise floor |
Pinout & Package
SOT-23-5 package (NS MF05A), 1.6 mm × 2.9 mm footprint, surface-mount, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin; must remain floating - not tied to ground or supply |
| 2 | GND | Analog ground reference; requires low-impedance connection to PCB ground plane |
| 3 | EN | Active-high enable; driven ≥65% VIN to activate; ≤35% VIN to enter 3 µA shutdown |
| 4 | VIN | Input supply; must exceed VREF + 400 mV (≥2.448 V) for regulation |
| 5 | VREF | Precision 2.048 V output; capable of sourcing up to 20 mA with <120 ppm/mA load regulation |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates without mandatory output capacitor; stable with 0–10 µF ceramic loads - simplifies layout and reduces BOM count |
| Micropower operation | 60 µA supply current enables multi-year operation from coin cells in portable test equipment |
| Low thermal hysteresis | 75 ppm hysteresis ensures repeatable voltage after thermal cycling - critical for field-deployed calibration gear |
| Indefinite short-circuit protection | Self-limits output to 75 mA during fault; recovers automatically when fault clears - no latch-up or damage risk |
| Wide input range | Accepts 2.448 V to 5.5 V input - interoperable with 2.5 V, 3.3 V, and 5 V system rails without LDO pre-regulation |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 1-minute intervals for 2+ years. IC Role / Device Role / Timing Role: Precision 2.048 V reference for 12-bit SAR ADC, ensuring consistent full-scale definition across temperature and battery discharge. Use Value: ±0.5% initial accuracy and 100 ppm/°C tempco limit total ADC gain error to <0.7% over operating range - eliminating need for per-unit calibration. |
Use Scenario: 4–20 mA loop-powered transmitter in hazardous-area process control, requiring high-reliability analog signal conditioning. IC Role / Device Role / Timing Role: Stable excitation source for bridge sensors and reference for DAC-driven current output stage. Use Value: 60 µA quiescent current leaves >1.5 mA headroom for sensor bias and signal chain within 4 mA loop budget - enabling true 4 mA "live zero" compliance. |
| Handheld Test Meters | Automotive Battery Monitors |
Use Scenario: Pocket-sized multimeter with autoranging, dual-slope integration, and backlit LCD powered by AA batteries. IC Role / Device Role / Timing Role: Primary reference for integrating ADC and auxiliary 2.5 V rail generation via charge pump. Use Value: Enable pin allows full shutdown between measurements, extending battery life by >5× versus always-on references - achieving >500 hours runtime. |
Use Scenario: In-vehicle 12 V battery health monitor measuring cell voltage, SOC, and temperature in start-stop systems. IC Role / Device Role / Timing Role: Reference for high-side current sense amplifier and microcontroller ADC monitoring battery terminal voltage. Use Value: −40°C to +125°C junction rating and AEC-Q100-compliant CQ variants ensure reliable performance under hood temperature extremes without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3020AIDBZR | 2.048 V, ±0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-3 (no EN pin) | Higher accuracy and lower tempco, but lacks enable and uses 3-pin package - requires board redesign | Select for metrology-grade accuracy where shutdown is unnecessary and layout allows 3-pin variant |
| MAX6029AEUR+T | 2.048 V, ±0.1% initial accuracy, 75 ppm/°C, 65 µA IQ, SOT-23-5 with EN | Superior accuracy/tempco and same pinout, but higher cost and limited automotive qualification | Select when 0.1% grade is required and TI's C-grade tolerance is insufficient for target system resolution |
Compared with LM4128CMFX-2.0, REF3020AIDBZR trades enable functionality and package compatibility for tighter accuracy, while MAX6029AEUR+T matches pinout and adds 0.1% grade at higher cost - making LM4128CMFX-2.0 optimal for cost-sensitive, space-constrained industrial designs needing balanced performance and shutdown capability.
Availability
LM4128CMFX-2.0 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and handheld test equipment requiring stable component supply, long-term parametric consistency, and SOT-23-5 footprint compatibility.
Supply support for LM4128CMFX-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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for the LM4128 family. TI is a global leader in analog and embedded processing, serving industrial, automotive, and communications markets.
The LM4128 series was designed specifically for micropower, space-constrained precision analog systems - emphasizing low dropout, capacitor-free stability, and wide-temperature operation in SOT-23-5 packaging.
FAQ
What is the guaranteed initial accuracy of LM4128CMFX-2.0 over temperature?
The LM4128CMFX-2.0 is specified as C grade, guaranteeing ±0.5% initial accuracy at 25°C and 100 ppm/°C maximum temperature coefficient over −40°C to +125°C. This means total output deviation remains within ±0.5% + (100 ppm/°C × ΔT) - e.g., ±0.6% at 125°C - verified across production lots per National Semiconductor datasheet Rev. October 2008.
Does LM4128CMFX-2.0 require an input capacitor, and what value is recommended?
Yes, LM4128CMFX-2.0 requires a minimum 0.1 µF ceramic (X5R/X7R) input capacitor (CIN) for stable operation. When an output capacitor is used, CIN must be ≥ COUT. For optimal noise suppression and startup behavior, 4.7 µF to 22 µF tantalum or ceramic input capacitance is recommended - as confirmed in the "Component Selection" section of the LM4128/LM4128Q datasheet.
Can LM4128CMFX-2.0 drive a 10 µF capacitive load without oscillation?
Yes, LM4128CMFX-2.0 is explicitly characterized for stability with capacitive loads up to 10 µF, including low-ESR ceramic types. The datasheet states "stable with capacitive loads up to 10 µF" and confirms this in Typical Performance Characteristics (Figure 20211055, Load Regulation) and Application Information - no external compensation is needed.
What is the minimum input voltage required for LM4128CMFX-2.0 to regulate at 2.048 V?
The minimum input voltage for LM4128CMFX-2.0 is VREF + 400 mV = 2.448 V at 10 mA load, per Absolute Maximum and Operating Ratings tables. At lighter loads, dropout decreases - e.g., 175 mV typical at 10 mA for 2.048 V version - but 2.448 V is the guaranteed minimum for full-spec operation across temperature and process variation.
Is LM4128CMFX-2.0 qualified for automotive applications?
No - LM4128CMFX-2.0 is the commercial-grade C variant. Automotive-qualified equivalents are LM4128CQ1MFX-2.0 (AEC-Q100 Grade 1, −40°C to +125°C, automotive flow) and LM4128AQ1MFX-2.0 (A grade, 0.1% accuracy). The "C" suffix without "Q" denotes industrial/commercial use only, as defined in the Ordering Information table on page 2 of the datasheet.
LM4128CMFX-2.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 190µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.448V ~ 5.5V
- Current - Supply:
- 100µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128CMFX-2.0 FAQ
1.How can I place an order for LM4128CMFX-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMFX-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 LM4128CMFX-2.0 reliable?
The price and inventory of LM4128CMFX-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 LM4128CMFX-2.0 is usually 5 days.
3.What payment methods are accepted for LM4128CMFX-2.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMFX-2.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMFX-2.0?
LM4128CMFX-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMFX-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 LM4128CMFX-2.0?
For technical support, including LM4128CMFX-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMFX-2.0 requirements.
6.How does Aetrix verify that LM4128CMFX-2.0 is sourced from the original manufacturer or authorized distributors?
All LM4128CMFX-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 LM4128CMFX-2.0 meets industry standards.
7.What is the process for return or replacement of LM4128CMFX-2.0?
All LM4128CMFX-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMFX-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 LM4128CMFX-2.0 part is unused and in its original packaging.
Return procedure for LM4128CMFX-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128CMFX-2.0 Tags
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