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Texas Instruments LM4128AMFX-2.5/NOPB
- Part No.:
- LM4128AMFX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMFX-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,171
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Product details
Overview
LM4128AMFX-2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 2.5 V output with ±0.1% initial accuracy (A-grade), 75 ppm/°C max temperature coefficient, and 60 µA supply current. It features an enable pin for 3 µA shutdown mode and supports up to 20 mA load current - ideal for high-accuracy ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4128AMFX-2.5/NOPB datasheet, LM4128AMFX-2.5/NOPB pinout, LM4128AMFX-2.5/NOPB application, or LM4128AMFX-2.5/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), stability with capacitive loads up to 10 µF, and operation across −40°C to +125°C junction temperature.
Technical Context
The LM4128AMFX-2.5/NOPB uses a band-gap–derived reference core optimized for low quiescent current and minimal thermal drift. Its enable-controlled architecture allows seamless integration into power-gated systems, with guaranteed turn-on time of ≤78.8 µs into 10 µF load.
It operates with input voltage as low as VREF + 400 mV (i.e., ≥2.9 V) up to 5.5 V, maintains stability without external output capacitor, and exhibits 275 µVPP (0.1–10 Hz) output noise - critical for 16-bit+ data acquisition systems requiring clean reference rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.1% (A-grade, 25°C); enables 16-bit DAC/ADC full-scale calibration without trimming |
| Tempco | 75 ppm/°C max (−40°C to +125°C); ensures ≤±190 µV total drift over full range |
| Supply Current | 60 µA typical; supports >1-year battery life in 10 µA-average-power IoT sensor nodes |
| Shutdown Current | 3 µA max (EN = 0 V); allows deep-sleep modes in portable medical devices |
| Dropout Voltage | 175–400 mV (10 mA load); permits use with single-cell Li-ion (3.0–4.2 V) or 3.3 V rails |
| Noise (0.1–10 Hz) | 275 µVPP; contributes <0.04 LSB error in 2.5 V / 16-bit system (≈38 µV LSB) |
| Load Regulation | 25–120 ppm/mA; holds output within ±2.5 µV/mA change - suitable for dynamic load switching |
Pinout & Package
5-pin SOT-23 (DBV) package with exposed pad not electrically connected; compact 2.9 mm × 1.6 mm footprint optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected and floating; no routing or soldering required |
| 2 (GND) | Analog ground reference | Primary return path for reference current; requires low-impedance connection to clean AGND plane |
| 3 (EN) | Active-high enable control | Drives internal regulator; VIH ≥65% VIN, VIL ≤35% VIN - compatible with 1.8 V/3.3 V logic |
| 4 (VIN) | Input supply rail | Accepts 2.9–5.5 V; must be bypassed with ≥0.1 µF ceramic capacitor (CIN) per layout guidelines |
| 5 (VREF) | Precision 2.5 V output | Low-impedance buffered reference; stable with 0–10 µF capacitive loads; COUT optional for transient improvement |
Key Features
| Feature | Design Value |
|---|---|
| No external output capacitor required | Stable with 0 µF COUT - reduces BOM count and board area in ultra-compact designs |
| Capacitive load drive capability | Supports up to 10 µF output capacitance - improves load transient response in multiplexed ADC systems |
| Low ESR ceramic capacitor compatibility | Validated with X5R/X7R dielectrics - avoids instability risks common with tantalum or electrolytic caps |
| Indefinite short-circuit protection | Limits output current to 75 mA - prevents damage during test fixture misconnection or PCB fault conditions |
| Wide operating temperature range | −40°C to +125°C junction rating - qualified for automotive under-hood and industrial motor-control environments |
Applications
| Instrumentation Signal Chain | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Precision analog front-end for handheld multimeters and portable oscilloscopes. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for 16-bit SAR ADC and programmable gain amplifier calibration. Use Value: Enables ±0.05% measurement accuracy over temperature without recalibration, leveraging 75 ppm/°C tempco and 275 µVPP noise. | Use Scenario: Long-duration environmental monitoring node powered by coin cell or Li-SOCl₂ battery. IC Role / Device Role / Timing Role: Supplies reference voltage to ultra-low-power microcontroller ADC and sensor signal conditioning circuitry. Use Value: 60 µA operating current and 3 µA shutdown mode extend battery life beyond 5 years in sleep-dominated duty cycles. |
| Automotive Sensor Modules | Medical Vital Sign Monitors |
Use Scenario: Pressure and temperature sensing in engine control units (ECUs) and brake-by-wire subsystems. IC Role / Device Role / Timing Role: Reference source for ratiometric bridge sensor interfaces and diagnostic ADCs in AEC-Q100–compliant modules. Use Value: −40°C to +125°C operation and 50 ppm long-term stability (1000 hrs) ensure consistent sensor linearity across vehicle lifetime. | Use Scenario: Portable ECG and pulse oximetry devices requiring clinical-grade analog accuracy. IC Role / Device Role / Timing Role: Bias reference for instrumentation amplifiers and anti-aliasing filters feeding 24-bit delta-sigma ADCs. Use Value: 0.1% initial accuracy and thermal hysteresis ≤75 ppm minimize baseline drift between patient measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5 V, ±0.2% initial accuracy, 100 ppm/°C max tempco, 50 µA IQ, SOT-23-3 | No enable pin; 3-pin package eliminates EN control but reduces flexibility in power sequencing | Choose when simplified layout and lowest quiescent current outweigh need for shutdown control |
| ADR3425ARTZ-R7 | 2.5 V, ±0.1% initial accuracy, 10 ppm/°C max tempco, 120 µA IQ, SOT-23-5 | Lower tempco but higher supply current; tighter tolerance at cost of 2× IQ and premium pricing | Choose for metrology-grade stability where 10 ppm/°C is mandatory and power budget allows |
Compared with REF3025AIDBZR and ADR3425ARTZ-R7, the LM4128AMFX-2.5/NOPB uniquely balances A-grade accuracy, integrated enable functionality, and micropower operation in a standard 5-pin SOT-23 - making it optimal for battery-aware, space-constrained embedded systems requiring flexible power management.
Availability
LM4128AMFX-2.5/NOPB is available at Aetrix Electronics and suitable for instrumentation & process control, portable battery-powered equipment, and automotive sensor modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128AMFX-2.5/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 analog IC design and high-volume manufacturing.
The LM4128 family was engineered for space-constrained, battery-sensitive applications demanding high initial accuracy, low drift, and robust capacitive-load stability - targeting portable instrumentation, automotive sensors, and industrial data acquisition.
FAQ
What is the maximum load current supported by the LM4128AMFX-2.5/NOPB?
The LM4128AMFX-2.5/NOPB supports up to 20 mA output current while maintaining specified accuracy and regulation. At 10 mA load, dropout voltage remains ≤400 mV, and load regulation is bounded to 120 ppm/mA - ensuring reliable performance in active biasing and buffer-driving applications.
Does the LM4128AMFX-2.5/NOPB require an external output capacitor?
No, the LM4128AMFX-2.5/NOPB is internally compensated and stable with 0 µF output capacitance. An optional COUT (up to 10 µF) may be added to improve load transient response, but it is not required for stability - simplifying layout and reducing bill-of-materials cost.
What is the input voltage range for the LM4128AMFX-2.5/NOPB?
The LM4128AMFX-2.5/NOPB operates with input voltage from (VREF + 400 mV) = 2.9 V minimum up to 5.5 V maximum. This 2.9–5.5 V range supports direct connection to single-cell Li-ion batteries, 3.3 V LDO outputs, and standard logic rails without additional regulation.
How does the enable pin (EN) function on the LM4128AMFX-2.5/NOPB?
The EN pin is an active-high digital control: applying ≥65% of VIN enables the reference output; ≤35% of VIN places LM4128AMFX-2.5/NOPB in shutdown mode drawing ≤7 µA. Internal pull-up (~2 µA) allows direct tie to VIN if always-on operation is desired.
Is the LM4128AMFX-2.5/NOPB qualified for automotive applications?
The LM4128AMFX-2.5/NOPB is not AEC-Q100 qualified; only the LM4128AQ/BQ/CQ/DQ variants carry Grade 1 automotive qualification. For non-automotive industrial or consumer applications requiring −40°C to +125°C operation, LM4128AMFX-2.5/NOPB meets full temperature specification but lacks automotive process flow validation.
LM4128AMFX-2.5/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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 275µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.9V ~ 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-2.5/NOPB FAQ
1.How can I place an order for LM4128AMFX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMFX-2.5/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-2.5/NOPB reliable?
The price and inventory of LM4128AMFX-2.5/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-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AMFX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMFX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMFX-2.5/NOPB?
LM4128AMFX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMFX-2.5/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-2.5/NOPB?
For technical support, including LM4128AMFX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMFX-2.5/NOPB requirements.
6.How does Aetrix verify that LM4128AMFX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AMFX-2.5/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-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AMFX-2.5/NOPB?
All LM4128AMFX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMFX-2.5/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-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128AMFX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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