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Texas Instruments LM4128AMFX-2.0
- Part No.:
- LM4128AMFX-2.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMFX-2.0.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,726
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Product details
Overview
LM4128AMFX-2.0 from National Semiconductor is a precision micropower series voltage reference in SOT-23-5 package, delivering 2.048 V output with ±0.1% initial accuracy, 75 ppm/°C temperature coefficient, and 60 µA quiescent current. It features an enable pin for 3 µA shutdown mode, supports up to 20 mA load, and operates across −40°C to +125°C - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128AMFX-2.0 datasheet, LM4128AMFX-2.0 pinout, LM4128AMFX-2.0 application, or LM4128AMFX-2.0 equivalent, key selection considerations include dropout voltage (≤400 mV at 10 mA), stability with capacitive loads up to 10 µF, line regulation (30 ppm/V), load regulation (25–120 ppm/mA), and thermal hysteresis (75 ppm).
Technical Context
The LM4128AMFX-2.0 uses a band-gap–derived reference core optimized for low-power operation and high DC precision. Its series architecture eliminates need for external stabilization capacitors while maintaining stability with ceramic output capacitance up to 10 µF - enabling compact, robust designs in space-constrained applications.
It integrates an enable input (EN) referenced to VIN, with defined VIH/VIL thresholds (65%/35% of VIN), allowing direct microcontroller control. Dropout voltage is specified at 175–400 mV depending on load, supporting operation from VREF + 400 mV to 5.5 V input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal - matches common 12-bit DAC/ADC full-scale reference points. |
| Initial Accuracy | ±0.1% at 25°C - ensures ≤2.05 mV absolute error before calibration. |
| Tempco | 75 ppm/°C max - contributes ≤188 µV drift over −40°C to +125°C span. |
| Quiescent Current | 60 µA - enables multi-year battery life in always-on sensor nodes. |
| Shutdown Current | 3 µA - reduces standby power by >95% when EN = 0 V. |
| Dropout Voltage | 175–400 mV at 10 mA - allows operation from 2.25 V supply in low-voltage systems. |
| Output Noise | 190 µVPP (0.1–10 Hz) - suitable for 16-bit precision measurement front-ends. |
Pinout & Package
SOT-23-5 package (NS package number MF05A), 1.6 mm × 2.9 mm footprint, 1.1 mm height, gull-wing leads. RoHS-compliant, rated for −40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin - must remain unconnected and floating per datasheet. |
| 2 | GND | Ground reference for internal circuitry and output return path. |
| 3 | EN | Enable input - logic-high (>65% VIN) activates reference; logic-low (<35% VIN) enters 3 µA shutdown. |
| 4 | VIN | Input supply - requires ≥2.448 V (2.048 V + 400 mV) for regulation; max 5.5 V. |
| 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 | Stable without mandatory output capacitor; supports optional COUT up to 10 µF for improved transient response. |
| Micropower operation | 60 µA supply current enables use in energy-harvesting and coin-cell–powered devices. |
| Low dropout | 400 mV max dropout at 10 mA allows direct regulation from single Li-ion or two alkaline cells. |
| Enable-controlled shutdown | 3 µA shutdown current reduces system idle power by orders of magnitude during sleep cycles. |
| High DC precision | ±0.1% initial accuracy and 75 ppm/°C tempco support uncalibrated 12-bit system accuracy. |
Applications
| Portable Data Loggers | Battery-Powered Medical Sensors |
|---|---|
|
Use Scenario: Continuous analog sensing (e.g., ECG, temperature) powered by CR2032 or Li-SOCl₂ cells with multi-month runtime. IC Role / Device Role / Timing Role: Precision 2.048 V reference for 12-bit SAR ADCs and low-noise signal conditioning stages. Use Value: 190 µVPP (0.1–10 Hz) noise and ±0.1% accuracy ensure ≤½ LSB error without calibration at room temperature. |
Use Scenario: Handheld pulse oximeters and glucose meters requiring FDA-grade repeatability and low power. IC Role / Device Role / Timing Role: Stable excitation/reference source for ratiometric measurements and analog front-end biasing. Use Value: 75 ppm/°C tempco and 75 ppm thermal hysteresis maintain measurement consistency across clinical operating environments. |
| Industrial Field Transmitters | Automotive Cabin Sensors |
|
Use Scenario: 4–20 mA loop-powered temperature/pressure transmitters operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Primary voltage reference for DAC-based current loop control and sensor signal scaling. Use Value: −40°C to +125°C junction rating and 400 mV dropout allow reliable operation with minimal headroom from loop supply. |
Use Scenario: Occupancy, humidity, and air quality sensors inside automotive HVAC modules. IC Role / Device Role / Timing Role: Reference for microcontroller ADCs monitoring cabin environmental parameters. Use Value: AEC-Q100 Grade 1 qualification (LM4128AQ variant) ensures reliability; this LM4128AMFX-2.0 shares identical specs and SOT-23-5 package. |
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) | No enable function; fixed 3-pin configuration limits power-gating capability | Select when board space is tighter and shutdown control is unnecessary. |
| MAX6029AESA+T | 2.048 V, ±0.1% initial accuracy, 75 ppm/°C, 65 µA IQ, SO-8 package | Larger SO-8 footprint; higher thermal resistance (θJ-A ≈ 200°C/W vs. 220°C/W for SOT-23-5) | Choose for legacy SO-8 layouts or where higher output current (25 mA) is required. |
Compared with REF3020AIDBZR and MAX6029AESA+T, the LM4128AMFX-2.0 uniquely combines A-grade precision, integrated enable control, SOT-23-5 compactness, and guaranteed 20 mA drive - making it optimal for new ultra-low-power, space-constrained designs requiring active power management.
Availability
LM4128AMFX-2.0 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered medical sensors, and industrial field transmitters requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LM4128AMFX-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
National Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by Texas Instruments in 2011. Its precision reference portfolio emphasized low-power, high-accuracy solutions for demanding measurement applications.
The LM4128 series was designed specifically for micropower, high-stability voltage referencing in portable and space-constrained systems - targeting instrumentation, data acquisition, and battery-operated industrial electronics.
FAQ
What is the maximum input voltage for the LM4128AMFX-2.0?
The LM4128AMFX-2.0 supports a maximum input voltage of 5.5 V. Operation above this level risks damage per Absolute Maximum Ratings. For reliable regulation, VIN must be ≥2.448 V (VREF + 400 mV) and ≤5.5 V, with recommended derating at elevated temperatures per thermal resistance θJ-A = 220°C/W.
Does the LM4128AMFX-2.0 require an input capacitor?
Yes - the LM4128AMFX-2.0 requires a minimum 0.1 µF ceramic input capacitor (X5R/X7R) for stable operation. If an output capacitor is used, CIN must be ≥ COUT. Larger input capacitors (e.g., 4.7–22 µF) reduce startup overshoot and improve PSRR, especially under noisy supply conditions.
What is the output voltage tolerance of the LM4128AMFX-2.0 over temperature?
The LM4128AMFX-2.0 (A grade) guarantees ≤75 ppm/°C temperature coefficient over −40°C to +125°C, resulting in ≤±188 µV total drift relative to 2.048 V. Combined with ±0.1% initial accuracy, total worst-case error remains within ±2.24 mV across full operating range.
Can the LM4128AMFX-2.0 drive a 10 µF capacitive load?
Yes - the LM4128AMFX-2.0 is explicitly characterized for stability with capacitive loads up to 10 µF. This eliminates need for external isolation resistors and simplifies layout in systems requiring low-output-impedance references for fast load transients, such as multiplexed ADC sampling circuits.
Is the LM4128AMFX-2.0 pin-compatible with other LM4128 variants?
Yes - all LM4128xMFX-x.x variants (including LM4128BMFX-2.0, LM4128CMFX-2.0, etc.) share identical SOT-23-5 pinout, electrical interface, and mechanical footprint. Only initial accuracy and tempco differ between grades; no PCB redesign is needed when upgrading or downgrading grade for cost or performance trade-offs.
LM4128AMFX-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:
- ±0.1%
- Temperature Coefficient:
- 75ppm/°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
LM4128AMFX-2.0 FAQ
1.How can I place an order for LM4128AMFX-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMFX-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 LM4128AMFX-2.0 reliable?
The price and inventory of LM4128AMFX-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 LM4128AMFX-2.0 is usually 5 days.
3.What payment methods are accepted for LM4128AMFX-2.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMFX-2.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMFX-2.0?
LM4128AMFX-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMFX-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 LM4128AMFX-2.0?
For technical support, including LM4128AMFX-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMFX-2.0 requirements.
6.How does Aetrix verify that LM4128AMFX-2.0 is sourced from the original manufacturer or authorized distributors?
All LM4128AMFX-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 LM4128AMFX-2.0 meets industry standards.
7.What is the process for return or replacement of LM4128AMFX-2.0?
All LM4128AMFX-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMFX-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 LM4128AMFX-2.0 part is unused and in its original packaging.
Return procedure for LM4128AMFX-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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