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Texas Instruments LM4128CMFX-2.5
- Part No.:
- LM4128CMFX-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMFX-2.5.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,044
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Product details
Overview
LM4128CMFX-2.5 from Texas Instruments (formerly National Semiconductor) is a precision micropower series voltage reference in SOT-23-5 package, delivering 2.5 V output with ±0.5% initial accuracy, 100 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 from −40°C to +125°C - ideal for battery-powered instrumentation and portable data acquisition.
For engineers reviewing the LM4128CMFX-2.5 datasheet, LM4128CMFX-2.5 pinout, LM4128CMFX-2.5 application, or LM4128CMFX-2.5 equivalent, key selection considerations include dropout voltage (≤400 mV at 10 mA), load regulation (≤120 ppm/mA), noise performance (275 µVPP, 0.1–10 Hz), stability with capacitive loads up to 10 µF, and AEC-Q100-comparable C-grade automotive qualification.
Technical Context
The LM4128CMFX-2.5 employs a band-gap-derived reference core optimized for low-power, high-stability operation in space-constrained systems. Its series architecture eliminates need for external stabilization capacitors while maintaining stability with ceramic output capacitance up to 10 µF.
It integrates an enable input (EN) referenced to VIN, supporting 3 µA shutdown current and defined logic thresholds (VIL ≤ 35% VIN, VIH ≥ 65% VIN). Input voltage range is VREF + 400 mV to 5.5 V, enabling use with low-headroom supplies in precision regulators and ADC biasing circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal; ±0.5% initial accuracy at 25°C ensures ≤12.5 mV absolute error in calibration-critical signal chains. |
| Temperature Coefficient | 100 ppm/°C max over −40°C to +125°C; contributes ≤250 µV/°C drift, suitable for industrial-grade measurement systems. |
| Quiescent Current | 60 µA typical; enables multi-year battery life in portable sensors and handheld test equipment. |
| Shutdown Current | 3 µA max when EN = 0 V; allows deep-sleep power management in intermittent-sampling applications. |
| Dropout Voltage | 400 mV max at 10 mA load; permits operation from 2.9 V supply, compatible with single-cell Li-ion or 3.3 V LDO outputs. |
| Output Noise | 275 µVPP (0.1–10 Hz); supports 16-bit+ ADC accuracy without additional filtering in precision DAQ front-ends. |
| Load Regulation | 120 ppm/mA max; maintains <±0.3 mV shift across 0–20 mA load, critical for programmable current sources and sensor excitation. |
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 stabilizing capacitor and supports capacitive loads up to 10 µF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect terminal; must be left floating - not tied to ground or supply. |
| 2 | GND | Analog ground reference; requires low-impedance PCB connection to minimize noise coupling into reference output. |
| 3 | EN | Enable control input; pulled internally to VIN; drives device into 3 µA shutdown when held ≤35% of VIN. |
| 4 | VIN | Input supply rail; must exceed VREF + 400 mV (≥2.9 V for 2.5 V output) and remain ≤5.5 V. |
| 5 | VREF | Precision 2.5 V output; capable of sourcing up to 20 mA; stable with ceramic bypass capacitors ≥0.1 µF. |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to 3 µA, enabling ultra-low-power sleep modes in portable instrumentation. |
| Capacitor-free stability | Eliminates mandatory input capacitor; only CIN ≥ COUT required - simplifies layout and reduces BOM count. |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault, preventing thermal runaway and enabling robust field deployment. |
| Low thermal hysteresis | 75 ppm max over −40°C to +125°C cycling; ensures repeatable calibration after temperature excursions in automotive ECUs. |
| Stable with 10 µF capacitive load | Supports large bulk output capacitance for improved transient response in servo amplifier feedback paths. |
Applications
| Portable Data Acquisition | Precision ADC Biasing |
|---|---|
Use Scenario: Handheld multimeter sampling analog inputs at 16-bit resolution using SAR ADC. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for ADC internal conversion and external signal scaling. Use Value: ±0.5% initial accuracy and 100 ppm/°C tempco ensure <±1 LSB error across industrial temperature range without recalibration. |
Use Scenario: Industrial PLC analog input module digitizing 4–20 mA sensor signals. IC Role / Device Role / Timing Role: Supplies precise reference to 24-bit sigma-delta ADC and programmable gain amplifier. Use Value: 275 µVPP (0.1–10 Hz) noise and 120 ppm/mA load regulation preserve dynamic range and linearity under varying sensor loads. |
| Battery-Powered Sensor Node | Automotive Engine Control Unit |
Use Scenario: Wireless environmental sensor node powered by coin cell, transmitting temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Reference source for low-power microcontroller ADC and analog front-end during active measurement bursts. Use Value: 60 µA operating current and 3 µA shutdown mode extend battery life beyond 5 years at 1% duty cycle. |
Use Scenario: Onboard diagnostics circuit in engine control unit measuring throttle position and oxygen sensor voltages. IC Role / Device Role / Timing Role: Precision reference for analog-to-digital conversion of safety-critical sensor signals. Use Value: C-grade specification (0.5%, 100 ppm/°C) meets AEC-Q100 Grade 1 requirements for −40°C to +125°C operation without derating. |
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, 50 ppm/°C, 50 µA IQ, SOT-23-3 (no EN pin) | Higher accuracy and lower tempco, but lacks enable control and has fixed 3-pin configuration | Select when highest stability is prioritized over shutdown capability and board space is constrained. |
| MAX6025AEUR+T | 2.5 V, ±0.1% initial accuracy, 25 ppm/°C, 75 µA IQ, SOT-23-5 (with EN) | Superior tempco and accuracy, but higher quiescent current and narrower input range (VREF + 150 mV to 5.5 V) | Select when ultra-low drift is required in high-reliability medical or test equipment, accepting higher IQ. |
Compared with REF3025AIDBZR and MAX6025AEUR+T, the LM4128CMFX-2.5 offers balanced performance: moderate accuracy and tempco with industry-leading 3 µA shutdown current and wide input headroom - making it optimal for cost-sensitive, battery-operated industrial sensors where enable control and long service life are essential.
Availability
LM4128CMFX-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition systems, and automotive sensor modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128CMFX-2.5 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 acquired National Semiconductor in 2011 and maintains full legacy support for the LM4128 family. TI is a global leader in analog and embedded processing, with broad portfolio spanning precision analog, power management, and signal chain solutions.
The LM4128 series was designed as a micropower, space-efficient voltage reference for battery-powered and thermally demanding applications - emphasizing low dropout, enable-controlled shutdown, and SOT-23-5 integration for compact PCB layouts.
FAQ
What is the maximum input voltage for LM4128CMFX-2.5?
The LM4128CMFX-2.5 supports a maximum input voltage of 5.5 V. Operation above this level risks permanent damage per Absolute Maximum Ratings. For reliable function, VIN must also remain ≥ VREF + 400 mV (i.e., ≥2.9 V for the 2.5 V output), ensuring adequate headroom for regulation. This 400 mV dropout requirement is verified across the full −40°C to +125°C junction temperature range.
Does LM4128CMFX-2.5 require an input capacitor?
Yes - an input capacitor (CIN) is required for stable operation of the LM4128CMFX-2.5. Per Application Information, CIN must be ≥ COUT; if no output capacitor is used, CIN must be ≥0.1 µF. Ceramic X5R/X7R types are recommended. The LM4128CMFX-2.5 does not require an external stabilization capacitor, unlike many older references, but CIN remains mandatory to suppress supply noise and ensure startup reliability.
What is the output voltage accuracy specification for LM4128CMFX-2.5?
The LM4128CMFX-2.5 is a C-grade device with ±0.5% initial accuracy at 25°C, meaning its output voltage falls within 2.4875 V to 2.5125 V at room temperature before aging or thermal effects. This tolerance is guaranteed by production testing and applies across the full operating temperature range when combined with its 100 ppm/°C temperature coefficient - resulting in worst-case deviation of ±0.75% over −40°C to +125°C.
Can LM4128CMFX-2.5 drive a 10 µF capacitive load?
Yes - the LM4128CMFX-2.5 is explicitly characterized for stability with capacitive loads up to 10 µF, as confirmed in the General Description and Electrical Characteristics sections. This capability eliminates need for series isolation resistors and supports fast load transient response in applications like servo amplifier references or high-capacitance ADC decoupling networks. Performance remains stable with low-ESR ceramic capacitors.
Is LM4128CMFX-2.5 qualified for automotive use?
The LM4128CMFX-2.5 is not AEC-Q100 qualified; only the Q-grade variants (e.g., LM4128CQ1MFX-2.5) carry AEC-Q100 Grade 1 qualification. However, the LM4128CMFX-2.5 shares identical electrical specifications, SOT-23-5 package, and −40°C to +125°C operating temperature range with its Q-grade counterparts - making it suitable for non-safety-critical automotive subsystems where formal qualification is not mandated, such as cabin climate sensors or infotainment auxiliary supplies.
LM4128CMFX-2.5 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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°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
LM4128CMFX-2.5 FAQ
1.How can I place an order for LM4128CMFX-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMFX-2.5 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 LM4128CMFX-2.5 reliable?
The price and inventory of LM4128CMFX-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CMFX-2.5 is usually 5 days.
3.What payment methods are accepted for LM4128CMFX-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMFX-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMFX-2.5?
LM4128CMFX-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMFX-2.5 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 LM4128CMFX-2.5?
For technical support, including LM4128CMFX-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMFX-2.5 requirements.
6.How does Aetrix verify that LM4128CMFX-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4128CMFX-2.5 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 LM4128CMFX-2.5 meets industry standards.
7.What is the process for return or replacement of LM4128CMFX-2.5?
All LM4128CMFX-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMFX-2.5, 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 LM4128CMFX-2.5 part is unused and in its original packaging.
Return procedure for LM4128CMFX-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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