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Texas Instruments LM4128AMFX-2.0/NOPB
- Part No.:
- LM4128AMFX-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMFX-2.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,645
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Product details
Overview
LM4128AMFX-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 ±0.1% initial accuracy, 75 ppm/°C max temperature coefficient, and 60 µA supply current. It operates from VIN ≥ 2.448 V (VREF + 400 mV) up to 5.5 V and supports 20 mA output current - ideal for high-resolution ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4128AMFX-2.0/NOPB datasheet, LM4128AMFX-2.0/NOPB pinout, LM4128AMFX-2.0/NOPB application, or LM4128AMFX-2.0/NOPB equivalent, key selection criteria include initial accuracy grade (A), dropout voltage at 10 mA (175–400 mV), enable-controlled shutdown (3–7 µA), load regulation (25–120 ppm/mA), and stability with up to 10 µF capacitive loads without external compensation.
Technical Context
The LM4128AMFX-2.0/NOPB uses an internal band-gap-derived reference core with active error correction to achieve low drift and high initial accuracy. Its enable input controls a high-impedance shutdown mode, reducing quiescent current to ≤7 µA while maintaining fast wake-up response.
Designed as a series reference, it eliminates the need for an external stabilizing capacitor and remains stable with ceramic output capacitance up to 10 µF. Input voltage must exceed VREF by at least 400 mV at 10 mA load to maintain 0.5% output accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal, ±0.1% initial accuracy (Grade A) - enables direct interface with 12-bit ADCs requiring ≤1 LSB error at full scale |
| Tempco | 75 ppm/°C max over −40°C to +125°C - ensures ≤±150 µV drift across industrial temperature range |
| Supply Current | 60 µA typical at 25°C - supports multi-year battery life in always-on sensor nodes |
| Shutdown Current | 3–7 µA when EN = 0 V - allows ultra-low-power duty-cycled operation |
| Dropout Voltage | 175–400 mV at 10 mA load - permits operation from single-cell Li-ion or 3.3 V rails with margin |
| Load Regulation | 25–120 ppm/mA - maintains <±25 µV shift from 0 to 20 mA load, critical for precision current sources |
| Noise (0.1–10 Hz) | 190 µVPP - suitable for 16-bit SAR ADC reference without additional filtering |
Pinout & Package
LM4128AMFX-2.0/NOPB is housed in a 5-pin SOT-23 (DBV) package (Package Number DBV, R-PDSO-G5), measuring 2.9 mm × 1.6 mm × 1.15 mm, with gull-wing leads and RoHS-compliant matte tin (Sn) lead finish. Thermal resistance θJ-A = 220°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected and floating; no internal connection or function |
| 2 - GND | Analog ground reference | Primary return path for reference core and output stage; requires low-impedance PCB connection |
| 3 - EN | Enable control input | Active-high logic input; VIH ≥ 65% VIN, VIL ≤ 35% VIN; drives shutdown mode when low |
| 4 - VIN | Input supply rail | Accepts 2.448 V to 5.5 V; minimum headroom of 400 mV required for full-load accuracy |
| 5 - VREF | Precision reference output | 2.048 V source capable of sourcing up to 20 mA; stable with 0–10 µF capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Grade A initial accuracy | ±0.1% ensures ≤2.05 mV absolute error at 2.048 V - meets calibration-grade requirements for field instruments |
| Capacitor-free stability | Stable with no COUT required and tolerant of up to 10 µF output capacitance - simplifies layout and reduces BOM count |
| Low dropout operation | 175 mV typical dropout at 10 mA enables use with 2.5 V system rails while retaining 0.5% accuracy |
| Enable-controlled shutdown | Reduces supply current to ≤7 µA, enabling microcontroller-gated power cycling in data loggers |
| Wide temperature range | Specified from −40°C to +125°C junction temperature - qualified for automotive under-hood and industrial motor-control environments |
Applications
| Portable Data Acquisition | Automotive Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered handheld multimeter acquiring 16-bit ADC samples at 1 kSPS. IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADC and DAC in analog front-end. Use Value: 190 µVPP low-frequency noise and 75 ppm/°C tempco ensure ≤0.5 LSB error across operating temperature and battery discharge cycle. |
Use Scenario: Engine control unit conditioning thermistor and pressure sensor outputs before ADC conversion. IC Role / Device Role / Timing Role: Stable excitation and reference source for ratiometric sensor measurements. Use Value: −40°C to +125°C operation and 50 ppm long-term stability over 1000 hrs support ASIL-B functional safety compliance. |
| Medical Patient Monitor Analog Front-End | Industrial PLC Analog Input Module |
Use Scenario: ECG signal chain requiring precise gain-setting and ADC reference in compact wearable design. IC Role / Device Role / Timing Role: Dual-role reference: sets op-amp gain via resistor divider and provides ADC reference. Use Value: 60 µA supply current and 2.048 V output match common 12-bit medical ADC full-scale ranges, minimizing digital scaling overhead. |
Use Scenario: 4–20 mA loop-powered analog input card processing multiple RTD and thermocouple channels. IC Role / Device Role / Timing Role: Shared precision reference for programmable gain instrumentation amplifiers and successive-approximation ADCs. Use Value: 20 mA output drive capability supports simultaneous biasing of multiple PGA channels without external buffers. |
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 (Grade A), 100 ppm/°C max tempco, 50 µA IQ, SOT-23-5 | Higher tempco and looser initial tolerance; lacks enable pin | Choose when enable functionality is unnecessary and cost sensitivity outweighs 0.1% accuracy requirement |
| ADR3420ARJZ-R7 | 2.048 V, ±0.1% initial accuracy, 30 ppm/°C max tempco, 120 µA IQ, SOT-23-5 | Lower tempco but higher supply current; no enable pin; tighter long-term stability (20 ppm/1000 hrs) | Choose when ultra-low drift dominates over power budget and shutdown control is handled externally |
Compared with REF3020AIDBZR and ADR3420ARJZ-R7, LM4128AMFX-2.0/NOPB uniquely combines Grade A accuracy, integrated enable, micropower operation (60 µA), and industrial temperature range in one SOT-23-5 package - making it optimal for space-constrained, battery-aware systems requiring on-demand precision.
Availability
LM4128AMFX-2.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, medical monitoring devices, and industrial PLC analog input circuits requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for LM4128AMFX-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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and broad industrial portfolio coverage.
LM4128AMFX-2.0/NOPB belongs to TI's precision voltage reference product line, engineered for high-accuracy, low-power, and temperature-stable operation in space-constrained, battery-sensitive, and mission-critical measurement systems.
FAQ
What is the maximum input voltage for LM4128AMFX-2.0/NOPB?
The LM4128AMFX-2.0/NOPB supports a maximum input voltage of 5.5 V across its specified operating temperature range. Exceeding this limit risks permanent damage, as absolute maximum rating for any pin is 6 V. Operation above 5.5 V violates the Absolute Maximum Ratings and voids reliability guarantees.
Does LM4128AMFX-2.0/NOPB require an input capacitor?
Yes - LM4128AMFX-2.0/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) between VIN and GND. When an output capacitor is used, CIN must be ≥ COUT. This capacitor ensures stability and suppresses supply noise that could modulate the reference output.
Can LM4128AMFX-2.0/NOPB drive a 10 µF load capacitance?
Yes - LM4128AMFX-2.0/NOPB is explicitly characterized for stability with capacitive loads up to 10 µF. Unlike many references, it does not require an external series resistor or isolation capacitor, simplifying design and improving transient response during load steps.
What is the shutdown current of LM4128AMFX-2.0/NOPB?
The LM4128AMFX-2.0/NOPB draws 3–7 µA in shutdown mode when the EN pin is driven low (≤35% VIN). This ultra-low standby current enables energy-efficient duty-cycled operation in battery-powered systems where the reference is only active during measurement windows.
Is LM4128AMFX-2.0/NOPB qualified for automotive applications?
No - LM4128AMFX-2.0/NOPB is not AEC-Q100 qualified. For automotive use, TI offers the LM4128Q series (e.g., LM4128AQMF-2.0/NOPB), which is AEC-Q100 Grade 1 qualified (−40°C to +125°C) and manufactured on an automotive-grade flow.
LM4128AMFX-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:
- ±0.1%
- 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/NOPB FAQ
1.How can I place an order for LM4128AMFX-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMFX-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 LM4128AMFX-2.0/NOPB reliable?
The price and inventory of LM4128AMFX-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 LM4128AMFX-2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AMFX-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMFX-2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMFX-2.0/NOPB?
LM4128AMFX-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMFX-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 LM4128AMFX-2.0/NOPB?
For technical support, including LM4128AMFX-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMFX-2.0/NOPB requirements.
6.How does Aetrix verify that LM4128AMFX-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AMFX-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 LM4128AMFX-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AMFX-2.0/NOPB?
All LM4128AMFX-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMFX-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 LM4128AMFX-2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128AMFX-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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