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Texas Instruments LM4128AMF-2.0/NOPB
- Part No.:
- LM4128AMF-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMF-2.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:637
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Product details
Overview
LM4128AMF-2.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 2.048 V output with ±0.1% initial accuracy (A-grade), 75 ppm/°C max temperature coefficient, and 60 µA supply current. It operates from VIN ≥ VREF + 400 mV up to 5.5 V and supports up to 20 mA load current - ideal for high-resolution ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4128AMF-2.0/NOPB datasheet, LM4128AMF-2.0/NOPB pinout, LM4128AMF-2.0/NOPB application, or LM4128AMF-2.0/NOPB equivalent, this page provides verified electrical specs, thermal performance data, enable-controlled shutdown behavior, and real-world stability metrics across −40°C to +125°C.
Technical Context
The LM4128AMF-2.0/NOPB uses an internal band-gap-derived reference core with active error correction, enabling stable 2.048 V output without external compensation capacitors. Its enable pin controls a low-leakage internal switch that reduces quiescent current to 3–7 µA in shutdown mode while preserving output integrity during transitions.
Designed for capacitive loads up to 10 µF, it maintains stability with low-ESR ceramic capacitors and exhibits 190 µVPP (0.1–10 Hz) output noise. Dropout voltage is specified at 175–400 mV (ILOAD = 10 mA), supporting operation from single Li-ion or dual alkaline cells.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; enables precise 12-bit DAC/ADC full-scale calibration without scaling resistors |
| Initial Accuracy | ±0.1% (A-grade); ensures ≤2.05 mV absolute error at 25°C for metrology-grade systems |
| Tempco | 75 ppm/°C max; limits drift to ≤15.4 µV/°C over −40°C to +125°C operating range |
| Supply Current | 60 µA typical; allows >1-year battery life in 10 µA sleep-cycle sensor nodes |
| Shutdown Current | 3–7 µA with EN = 0 V; enables duty-cycled reference activation in energy-constrained IoT endpoints |
| Load Current | Up to 20 mA; drives multiple op-amp inputs or SAR ADC reference inputs simultaneously |
| Noise (0.1–10 Hz) | 190 µVPP; contributes <0.02 LSB error in 16-bit 2.048 V full-scale conversions |
Pinout & Package
LM4128AMF-2.0/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package with 1.27 mm pitch, optimized for space-constrained PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected; floating per TI specification - no tie to GND or VIN |
| 2 - GND | Analog ground reference | Low-impedance return path for reference core; requires dedicated ground plane connection |
| 3 - EN | Enable control input | Active-high logic; VIH ≥ 65% VIN, VIL ≤ 35% VIN; internal 2 µA pull-up allows direct VIN tie |
| 4 - VIN | Input supply rail | Accepts 2.448 V to 5.5 V; dropout headroom of 400 mV enables use with 2.7 V coin cells |
| 5 - VREF | Precision output terminal | 2.048 V source with ±0.1% accuracy; capable of sourcing/sinking up to 20 mA |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates stably without COUT; eliminates BOM cost and layout area for bypass cap |
| Low dropout operation | 175 mV min dropout at 10 mA enables use with 2.5 V system rails and LiFePO4 batteries |
| Thermal hysteresis | 75 ppm max; ensures repeatable output after thermal cycling between −40°C and +125°C |
| Long-term stability | 50 ppm over 1000 hours; reduces recalibration frequency in field-deployed test equipment |
| Short-circuit protection | Indefinite 75 mA current limit; prevents damage during board-level ESD or probe faults |
Applications
| Portable Data Acquisition | Automotive Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter sampling 16-bit sigma-delta ADC at 10 SPS. IC Role / Device Role / Timing Role: Primary voltage reference for ADC VREF+ input and internal PGA gain-setting network. Use Value: 2.048 V output matches ADC's native full-scale range, eliminating digital scaling; ±0.1% accuracy ensures Class I meter compliance per IEC 61000-4-30. |
Use Scenario: Engine control unit measuring exhaust gas oxygen concentration via wideband lambda sensor. IC Role / Device Role / Timing Role: Stable bias source for sensor heater driver op-amp and analog front-end instrumentation amplifier. Use Value: 75 ppm/°C tempco maintains <±0.5% sensor linearity over −40°C to +125°C under-hood conditions. |
| Medical Patient Monitor Analog Front End | Industrial PLC Analog Input Module |
|
Use Scenario: Portable ECG device digitizing biopotential signals with 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Reference for ADC and programmable gain amplifier used in lead-off detection circuitry. Use Value: 190 µVPP (0.1–10 Hz) noise contributes <0.01 LSB error, preserving microvolt-level ST-segment resolution. |
Use Scenario: DIN-rail mounted PLC acquiring 4–20 mA loop signals across 8 channels with simultaneous sampling. IC Role / Device Role / Timing Role: Shared precision reference for all channel-specific 16-bit SAR ADCs and isolation amplifier bias networks. Use Value: 20 mA drive capability supports parallel loading of eight isolated ADC references without gain error accumulation. |
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; lacks enable pin | Use where shutdown control is unnecessary and cost sensitivity outweighs long-term stability requirements |
| ADR3420ARJZ-R7 | 2.048 V, ±0.1% initial accuracy, 30 ppm/°C, 120 µA IQ, SOT-23-5 | Lower tempco but higher supply current; no enable function | Prefer when ultra-low drift dominates power budget concerns, e.g., laboratory-grade calibrators |
Compared with REF3020AIDBZR and ADR3420ARJZ-R7, LM4128AMF-2.0/NOPB uniquely combines A-grade accuracy, integrated enable control, and micropower operation - making it optimal for battery-operated, duty-cycled measurement systems requiring guaranteed startup timing and thermal repeatability.
Availability
LM4128AMF-2.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, medical patient monitors, and industrial PLC analog input circuits requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128AMF-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 and embedded processing technologies, with decades of expertise in precision reference design and high-reliability automotive qualification.
The LM4128 series was engineered specifically for space-constrained, battery-powered measurement systems demanding high initial accuracy, low drift, and enable-controlled power gating - targeting portable test gear, automotive ECUs, and industrial data loggers.
FAQ
What is the minimum input voltage required for stable operation of LM4128AMF-2.0/NOPB?
The LM4128AMF-2.0/NOPB requires VIN ≥ VREF + 400 mV, i.e., ≥2.448 V, to maintain output regulation within specifications at 10 mA load. Below this, dropout behavior occurs - output voltage drops linearly with input. At lighter loads, operation down to 2.25 V may be possible but is not guaranteed per datasheet limits.
Does LM4128AMF-2.0/NOPB require an external output capacitor for stability?
No - LM4128AMF-2.0/NOPB is internally compensated and stable with or without COUT. An optional 0.1–10 µF ceramic capacitor on VREF improves load transient response but is not needed for basic stability. Input capacitor CIN ≥ 0.1 µF is mandatory.
What is the actual output voltage tolerance of LM4128AMF-2.0/NOPB over temperature?
LM4128AMF-2.0/NOPB (A-grade) guarantees ±0.1% initial accuracy at 25°C and 75 ppm/°C max tempco over −40°C to +125°C. Total worst-case deviation is ±0.1% + (75 ppm × 165°C) ≈ ±0.224%, or ±4.6 mV around 2.048 V - confirmed by TI's "Box method" characterization.
How does the enable pin (EN) behave when left unconnected on LM4128AMF-2.0/NOPB?
LM4128AMF-2.0/NOPB features an internal ~2 µA pull-up current source on EN. When left floating, EN rises to VIN level, enabling the device. For guaranteed disable, EN must be actively driven below 35% VIN (e.g., to GND). Do not rely on open-circuit disable behavior.
Can LM4128AMF-2.0/NOPB drive a 10 µF capacitive load without oscillation?
Yes - LM4128AMF-2.0/NOPB is characterized stable with capacitive loads up to 10 µF, including low-ESR ceramic types. This capability eliminates need for series isolation resistors and simplifies filtering in high-precision signal chains using the LM4128AMF-2.0/NOPB reference.
LM4128AMF-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
LM4128AMF-2.0/NOPB FAQ
1.How can I place an order for LM4128AMF-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMF-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 LM4128AMF-2.0/NOPB reliable?
The price and inventory of LM4128AMF-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 LM4128AMF-2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AMF-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMF-2.0/NOPB transactions.
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4.How is shipping managed for LM4128AMF-2.0/NOPB?
LM4128AMF-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMF-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 LM4128AMF-2.0/NOPB?
For technical support, including LM4128AMF-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMF-2.0/NOPB requirements.
6.How does Aetrix verify that LM4128AMF-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AMF-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 LM4128AMF-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AMF-2.0/NOPB?
All LM4128AMF-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMF-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 LM4128AMF-2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128AMF-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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