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Texas Instruments LM4128CMFX-2.0/NOPB
- Part No.:
- LM4128CMFX-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMFX-2.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,954
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Product details
Overview
LM4128CMFX-2.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 2.048 V output with ±0.5% initial accuracy (C grade), 100 ppm/°C max temperature coefficient, and 60 µA supply current. It features an enable pin for 3–7 µA shutdown mode, supports up to 20 mA load, and operates from −40°C to +125°C - ideal for battery-powered instrumentation and portable data acquisition.
For engineers reviewing the LM4128CMFX-2.0/NOPB datasheet, LM4128CMFX-2.0/NOPB pinout, LM4128CMFX-2.0/NOPB application, or LM4128CMFX-2.0/NOPB equivalent, key selection criteria include its 2.048 V reference output, low dropout (≤400 mV at 10 mA), stability with capacitive loads up to 10 µF, and guaranteed performance across automotive-grade temperature range without external stabilization capacitor.
Technical Context
The LM4128CMFX-2.0/NOPB uses an internal band-gap-derived architecture optimized for low quiescent current and high DC accuracy. Its enable-controlled operation allows seamless integration into power-gated systems, while the absence of required output capacitance simplifies layout and reduces BOM count.
It achieves stable regulation with input voltages as low as VREF + 400 mV (i.e., ≥2.448 V), maintains ≤120 ppm/mA load regulation over 0–20 mA, and exhibits ≤100 ppm/V line regulation - enabling reliable use in low-headroom, noise-sensitive analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; enables precise 12-bit DAC/ADC full-scale alignment without trimming |
| Initial Accuracy | ±0.5% (C grade); ensures ≤10.24 mV absolute error at 25°C for calibration-critical circuits |
| Tempco | 100 ppm/°C max; contributes ≤0.25 mV drift over −40°C to +125°C ambient |
| Supply Current | 60 µA typical; supports >1-year battery life in 10 µA-average-power IoT sensor nodes |
| Shutdown Current | 3–7 µA with EN = 0 V; enables ultra-low-power sleep modes in portable equipment |
| Dropout Voltage | ≤400 mV at 10 mA; allows operation from single-cell Li-ion (3.0–4.2 V) or 3.3 V rails with margin |
| Load Drive | Up to 20 mA; sufficient to directly bias op-amp references, ADC buffers, or small DACs |
Pinout & Package
LM4128CMFX-2.0/NOPB is housed in a 5-pin SOT-23 (DBV) package - RoHS-compliant, surface-mount, 2.9 mm × 1.6 mm footprint with 0.95 mm height and 0.95 mm pin pitch. The no-connect (N/C) pin (Pin 1) must remain floating per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | N/C | No-connect; electrically isolated - must be left unconnected and unbonded on PCB |
| Pin 2 | GND | Analog ground reference; requires low-impedance connection to system AGND plane |
| Pin 3 | EN | Active-high enable input; driven >65% of VIN to activate; <35% to enter shutdown |
| Pin 4 | VIN | Input supply; must exceed VREF + 400 mV (≥2.448 V) for regulation at 10 mA load |
| Pin 5 | VREF | Precision 2.048 V output; stable with 0–10 µF capacitive loads; bypass capacitor optional |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to 3–7 µA, enabling rapid power cycling in duty-cycled measurement systems |
| No external output capacitor required | Eliminates layout sensitivity and startup delay; stable with 0–10 µF COUT, including ceramic X5R/X7R |
| Low thermal hysteresis | 75 ppm max; ensures repeatable output voltage after thermal cycling between −40°C and +125°C |
| Stable with low-ESR ceramics | Supports modern 0402/0603 MLCCs without oscillation risk - simplifies high-frequency noise filtering |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault; prevents damage during board-level test or miswiring |
Applications
| Portable Data Loggers | Battery-Powered Medical Sensors |
|---|---|
|
Use Scenario: Continuous 12-bit ADC sampling in handheld environmental monitors powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Provides stable 2.048 V reference for SAR ADC conversion, eliminating gain drift across temperature and battery discharge. Use Value: Enables ±0.5 LSB total unadjusted error over −20°C to +70°C without recalibration, extending field calibration intervals to 2+ years. |
Use Scenario: ECG front-end with rail-to-rail instrumentation amplifiers and low-power microcontroller-based signal processing. IC Role / Device Role / Timing Role: Supplies precision bias voltage for ADC reference and op-amp common-mode setting in analog front-end (AFE). Use Value: Delivers 190 µV thermal hysteresis and 275 µVPP (0.1–10 Hz) noise - preserving SNR >86 dB in sub-µV biopotential measurements. |
| Industrial PLC Analog Input Modules | Automotive Cabin Temperature Controllers |
|
Use Scenario: 4–20 mA loop-powered transmitter with integrated 16-bit ΣΔ ADC and HART modulation. IC Role / Device Role / Timing Role: Serves as primary reference for both ADC and DAC in bidirectional current-loop interface. Use Value: Maintains ±0.5% accuracy over −40°C to +85°C industrial range, supporting SIL-2 functional safety compliance without derating. |
Use Scenario: HVAC control unit measuring NTC thermistor resistance via ratiometric ADC in vehicle cabin. IC Role / Device Role / Timing Role: Generates 2.048 V reference for microcontroller's internal ADC, enabling ratiometric measurement against same VREF. Use Value: Guarantees <±1°C temperature reading accuracy over −40°C to +125°C junction range, meeting AEC-Q100 Grade 1 requirements. |
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 (A grade), 50 ppm/°C tempco, 50 µA IQ, SOT-23-5 | Higher accuracy and lower tempco, but no enable pin - requires external FET for shutdown | Choose when tighter DC specs are critical and system-level enable control is already available |
| MAX6029AESA+ | 2.048 V, ±0.1% initial accuracy, 30 ppm/°C tempco, 65 µA IQ, SO-8 package | Superior stability and noise (12 µVPP), but larger SO-8 footprint and no enable function | Prefer for high-precision lab equipment where board space and shutdown capability are secondary |
Compared with LM4128CMFX-2.0/NOPB, REF3020AIDBZR offers better accuracy and tempco but lacks integrated enable, while MAX6029AESA+ delivers superior noise and long-term stability at the cost of package size and power-control flexibility - making LM4128CMFX-2.0/NOPB optimal for space-constrained, battery-operated systems requiring active power gating.
Availability
LM4128CMFX-2.0/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and automotive cabin controllers requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4128CMFX-2.0/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, embedded processing, and connectivity technologies, with decades of expertise in precision analog IC design.
The LM4128 product line delivers micropower, high-accuracy series voltage references for battery-powered and space-constrained applications - designed specifically for instrumentation, portable test gear, and automotive subsystems demanding robustness across extended temperature ranges.
FAQ
What is the output voltage tolerance of LM4128CMFX-2.0/NOPB over temperature?
The LM4128CMFX-2.0/NOPB has a guaranteed initial accuracy of ±0.5% at 25°C (C grade), and its maximum temperature coefficient is 100 ppm/°C over −40°C to +125°C. This results in a worst-case total output deviation of approximately ±0.75% across the full operating range, confirmed by TI's "Box method" characterization and production testing.
Does LM4128CMFX-2.0/NOPB require an input capacitor?
Yes - LM4128CMFX-2.0/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) connected between VIN and GND. When an output capacitor (COUT) is used, CIN must be ≥ COUT. This is mandatory for stability and noise suppression, as specified in TI's Application Information section and validated in all typical performance curves.
Can LM4128CMFX-2.0/NOPB drive a 10 µF capacitive load?
Yes - LM4128CMFX-2.0/NOPB is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, including low-ESR ceramic types. This eliminates need for isolation resistors and supports fast load transient response in ADC reference buffering and precision regulator applications.
What is the minimum input voltage needed for LM4128CMFX-2.0/NOPB to regulate at full load?
LM4128CMFX-2.0/NOPB requires VIN ≥ VREF + 400 mV to maintain regulation at 10 mA load, i.e., ≥2.448 V. At lighter loads, dropout decreases - e.g., 175 mV at 10 mA for 2.048 V version - but 2.448 V is the guaranteed minimum for full 20 mA output capability per Electrical Characteristics table.
Is LM4128CMFX-2.0/NOPB qualified for automotive use?
No - LM4128CMFX-2.0/NOPB is the commercial-grade (C grade) variant. For automotive applications, TI offers the LM4128CQMF-2.0/NOPB (AEC-Q100 Grade 1 qualified), which shares identical electrical specs but undergoes additional stress testing and is manufactured on an automotive-grade flow.
LM4128CMFX-2.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM4128CMFX-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMFX-2.0/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 LM4128CMFX-2.0/NOPB reliable?
The price and inventory of LM4128CMFX-2.0/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CMFX-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMFX-2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMFX-2.0/NOPB?
LM4128CMFX-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMFX-2.0/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 LM4128CMFX-2.0/NOPB?
For technical support, including LM4128CMFX-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMFX-2.0/NOPB requirements.
6.How does Aetrix verify that LM4128CMFX-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CMFX-2.0/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 LM4128CMFX-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CMFX-2.0/NOPB?
All LM4128CMFX-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMFX-2.0/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 LM4128CMFX-2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128CMFX-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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