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Texas Instruments LM4128AMF-2.0
- Part No.:
- LM4128AMF-2.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMF-2.0.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,708
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Product details
Overview
LM4128AMF-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 LM4128AMF-2.0 datasheet, LM4128AMF-2.0 pinout, LM4128AMF-2.0 application, or LM4128AMF-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 LM4128AMF-2.0 uses an internal band-gap-derived reference core optimized for low-power operation, eliminating need for external stabilization capacitors while maintaining stability with capacitive loads ≤10 µF. Its enable-controlled architecture allows seamless integration into power-gated subsystems.
Designed as a series reference, it avoids idle current waste typical of shunt types, achieving 60 µA supply current and 400 mV dropout - enabling operation from VIN ≥ 2.448 V (VREF + 400 mV) up to 5.5 V. Output noise is specified at 190 µVPP (0.1 Hz to 10 Hz), supporting high-resolution ADC biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; enables precise 12-bit DAC/ADC full-scale alignment without scaling. |
| Initial Accuracy | ±0.1% at 25°C; ensures ≤±2.05 mV absolute error before calibration. |
| Tempco | 75 ppm/°C max (A grade); contributes ≤±150 µV/°C drift over industrial range. |
| Quiescent Current | 60 µA typical; supports >1-year battery life in 10 µA-system sleep modes. |
| Shutdown Current | 3 µA max (EN = 0 V); reduces standby power by 20× vs active mode. |
| Dropout Voltage | 400 mV max at 10 mA; allows operation from single-cell Li-ion (3.0 V min) or 2.5 V rails. |
| Load Regulation | 25–120 ppm/mA; maintains <±25 µV/mA output shift under dynamic load changes. |
| Output Noise | 190 µVPP (0.1–10 Hz); suitable for 16-bit SAR ADC reference without external filtering. |
Pinout & Package
SOT-23-5 package (NS package number MF05A), surface-mount, 1.6 mm × 2.9 mm footprint, 1.1 mm height. Pin 1 is N/C (no connect); device requires no external pull-up on EN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin; must remain unconnected and floating per datasheet. |
| 2 | GND | Analog ground reference; requires low-impedance PCB connection to minimize noise coupling. |
| 3 | EN | Active-high enable input; driven high (>65% VIN) to activate, low (<35% VIN) to enter 3 µA shutdown. |
| 4 | VIN | Input supply rail; 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 | Stable with no output capacitor; eliminates BOM cost and layout area for COUT. |
| Low-dropout operation | 400 mV dropout at 10 mA enables use with 2.5 V or single-cell Li-ion supplies. |
| Enable-controlled shutdown | 3 µA shutdown current reduces system standby power without external FET control. |
| High capacitive load drive | Stable with up to 10 µF ceramic output capacitance - improves transient response in sensor front-ends. |
| Industrial temperature range | −40°C to +125°C junction operation supports automotive under-hood and industrial motor control environments. |
Applications
| Portable Data Acquisition | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Handheld multimeter sampling analog inputs via 16-bit SAR ADC. IC Role / Device Role / Timing Role: Precision 2.048 V reference for ADC full-scale calibration and offset compensation. Use Value: ±0.1% initial accuracy and 75 ppm/°C tempco ensure <±0.01% measurement error across 0–50°C ambient. |
Use Scenario: Portable gas analyzer using electrochemical sensors with low-noise signal chain. IC Role / Device Role / Timing Role: Low-noise (190 µVPP), low-quiescent-current reference for transimpedance amplifier biasing. Use Value: 60 µA supply current extends 2xAA alkaline battery life to >18 months in periodic-read mode. |
| Automotive Sensor Modules | Industrial Process Controllers |
Use Scenario: Engine coolant temperature sensor module operating in under-hood environment. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualified reference (LM4128AQ variant) for ratiometric RTD bridge excitation. Use Value: −40°C to +125°C operation and 75 ppm/°C tempco maintain <±0.2°C sensor accuracy over full vehicle thermal profile. |
Use Scenario: DIN-rail mounted PLC analog input card conditioning 4–20 mA loop signals. IC Role / Device Role / Timing Role: Stable 2.048 V reference for 12-bit DAC generating precise loop current setpoints. Use Value: 20 mA output drive capability and 25 ppm/mA load regulation prevent setpoint drift during loop impedance variations. |
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, 100 ppm/°C, 50 µA IQ, SOT-23-5 | Higher tempco and lower accuracy than LM4128AMF-2.0; no enable pin | Choose when enable functionality is unnecessary and cost sensitivity outweighs accuracy requirements. |
| ADR3420ARJZ-R7 | 2.048 V, ±0.1% initial accuracy, 30 ppm/°C, 120 µA IQ, SOT-23-5 | Lower tempco but higher quiescent current; no shutdown mode | Prefer when ultra-low drift dominates design priority and system can tolerate 2× higher supply current. |
Compared with REF3020AIDBZR and ADR3420ARJZ-R7, the LM4128AMF-2.0 uniquely combines A-grade accuracy (±0.1%), low tempco (75 ppm/°C), micropower operation (60 µA), and integrated enable/shutdown - making it optimal for space-constrained, battery-sensitive applications requiring both precision and power gating.
Availability
LM4128AMF-2.0 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and automotive sensor modules requiring stable component supply with guaranteed long-term availability.
Supply support for LM4128AMF-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 remains widely deployed in industrial and automotive systems.
The LM4128 series was designed specifically for micropower, space-constrained applications demanding high initial accuracy and low temperature drift - targeting portable test equipment, battery-operated sensors, and automotive subsystems where supply headroom and quiescent current are critical.
FAQ
What is the maximum input voltage for LM4128AMF-2.0?
The LM4128AMF-2.0 supports a maximum input voltage of 5.5 V, as specified in the Absolute Maximum Ratings. Operation above this level risks permanent damage. For reliable regulation, VIN must be ≥ VREF + 400 mV (i.e., ≥2.448 V at 10 mA load), and the recommended operating range is 2.448 V to 5.5 V per the Electrical Characteristics table.
Does LM4128AMF-2.0 require an external output capacitor?
No, the LM4128AMF-2.0 is internally compensated and stable without an external output capacitor. A 0.1 µF minimum ceramic input capacitor (CIN) is mandatory, and COUT is optional. Adding up to 10 µF ceramic COUT improves load transient response but increases turn-on time - a trade-off documented in the Application Information section.
What is the function of Pin 1 (N/C) on LM4128AMF-2.0?
Pin 1 of the LM4128AMF-2.0 is designated N/C (No Connect) and must remain unconnected and electrically floating. It is not internally bonded and has no circuit function; soldering or routing to this pin may cause mechanical stress or contamination-related reliability issues per the PCB Layout Considerations section.
How does the enable pin (Pin 3) operate on LM4128AMF-2.0?
The enable pin (EN, Pin 3) is active-high with threshold levels defined as VIL ≤ 35% VIN (max) for disable and VIH ≥ 65% VIN (min) for enable. When pulled low (≤0.8 V typical at VIN = 2.5 V), LM4128AMF-2.0 enters 3 µA shutdown mode; when tied to VIN or driven high, it operates normally. The internal pull-up (~2 µA) allows direct VIN connection if external control is unnecessary.
What is the thermal hysteresis specification for LM4128AMF-2.0?
The LM4128AMF-2.0 exhibits 75 ppm thermal hysteresis over the −40°C to +125°C cycle, defined as the change in 25°C output voltage before and after temperature excursion. This value is guaranteed for A-grade devices and directly impacts repeatability in cyclic thermal environments such as automotive engine bay monitoring or industrial oven controllers.
LM4128AMF-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
LM4128AMF-2.0 FAQ
1.How can I place an order for LM4128AMF-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMF-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 LM4128AMF-2.0 reliable?
The price and inventory of LM4128AMF-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 LM4128AMF-2.0 is usually 5 days.
3.What payment methods are accepted for LM4128AMF-2.0?
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4.How is shipping managed for LM4128AMF-2.0?
LM4128AMF-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMF-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 LM4128AMF-2.0?
For technical support, including LM4128AMF-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMF-2.0 requirements.
6.How does Aetrix verify that LM4128AMF-2.0 is sourced from the original manufacturer or authorized distributors?
All LM4128AMF-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 LM4128AMF-2.0 meets industry standards.
7.What is the process for return or replacement of LM4128AMF-2.0?
All LM4128AMF-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMF-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 LM4128AMF-2.0 part is unused and in its original packaging.
Return procedure for LM4128AMF-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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