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Texas Instruments LM4128CMF-3.0
- Part No.:
- LM4128CMF-3.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMF-3.0.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,567
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Product details
Overview
LM4128CMF-3.0 from National Semiconductor is a precision micropower series voltage reference in SOT-23-5 package, delivering 3.0 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 portable instrumentation and battery-powered data acquisition.
For engineers reviewing the LM4128CMF-3.0 datasheet, LM4128CMF-3.0 pinout, LM4128CMF-3.0 application, or LM4128CMF-3.0 equivalent, key selection considerations include dropout voltage (≤400 mV at 10 mA), line regulation (70 ppm/V), load regulation (25–120 ppm/mA), noise performance (285 µVPP, 0.1–10 Hz), and compatibility with ceramic capacitive loads up to 10 µF without external stabilization.
Technical Context
The LM4128CMF-3.0 implements a band-gap-derived series reference architecture with internal enable control logic and short-circuit protection (75 mA limit). Its design eliminates need for external stabilization capacitors while maintaining stability with capacitive loads up to 10 µF, enabled by low-output-impedance buffering and optimized internal compensation.
It operates across VIN = VREF + 400 mV to 5.5 V, supports force-sense configurations via separate VIN/GND paths, and delivers stable 3.0 V output under varying load (0–20 mA) and line (±70 ppm/V) conditions - making it suitable for high-resolution ADC/DAC biasing and precision regulator feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V nominal; ±0.5% initial accuracy at 25°C ensures ≤±15 mV absolute error in calibration-critical circuits. |
| Temperature Coefficient | 100 ppm/°C max over −40°C to +125°C; contributes ≤±300 µV/°C drift, supporting 12-bit+ system accuracy. |
| Quiescent Current | 60 µA typical; enables multi-year operation in coin-cell–powered sensors and portable test equipment. |
| Dropout Voltage | ≤400 mV at 10 mA load; allows operation from 3.4 V supply, compatible with single Li-ion or dual alkaline cells. |
| Enable Function | EN pin enables 3 µA shutdown mode; reduces power to <10 µW during sleep cycles in duty-cycled systems. |
| Noise (0.1–10 Hz) | 285 µVPP; low enough for 16-bit SAR ADC reference without additional filtering in precision DAQ. |
| Load Regulation | 25–120 ppm/mA; maintains <±0.36 mV shift from 0 to 20 mA, critical for variable-current sensor interfaces. |
Pinout & Package
SOT-23-5 package (NS package number MF05A), surface-mount, 1.6 mm × 2.9 mm footprint, rated for −40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin; must remain unconnected and floating per datasheet specification. |
| 2 | GND | Analog ground reference; requires low-impedance connection to system AGND plane for noise immunity. |
| 3 | EN | Active-high enable input; driven >65% of VIN to activate; pulled internally to VIN if left open. |
| 4 | VIN | Input supply rail; must exceed VREF + 400 mV (≥3.4 V) for full-load operation at 20 mA. |
| 5 | VREF | Precision 3.0 V output; capable of sourcing up to 20 mA; stable with 0–10 µF ceramic capacitive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Stable with no output capacitor required; eliminates BOM cost and board space for stabilization caps. |
| Micropower shutdown | 3 µA supply current in EN = low state enables ultra-low-power wake-on-event architectures. |
| Low thermal hysteresis | 75 ppm over −40°C to +125°C cycling; minimizes calibration drift after thermal excursions in field-deployed gear. |
| Indefinite short-circuit protection | Self-limiting 75 mA output current prevents damage during accidental GND shorts or PCB faults. |
| Wide capacitive load tolerance | Stable with up to 10 µF ceramic output capacitance, enabling fast load transient response in servo feedback loops. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure over months using 16-bit ADCs. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and sensor excitation circuitry. Use Value: 60 µA quiescent current extends battery life; ±0.5% initial accuracy and 100 ppm/°C tempco maintain measurement integrity across operating temperature range. |
Use Scenario: 4–20 mA loop-powered transmitters converting RTD or strain-gauge signals in factory automation. IC Role / Device Role / Timing Role: Precision reference for analog front-end gain/offset calibration and DAC output scaling. Use Value: Load regulation ≤120 ppm/mA ensures stable reference under varying loop current; SOT-23-5 footprint saves space in compact transmitter housings. |
| Medical Patient Monitors | Automotive Battery Management Units |
Use Scenario: Portable ECG and pulse oximetry devices requiring low-noise, stable references for analog signal conditioning. IC Role / Device Role / Timing Role: Reference source for instrumentation amplifiers and anti-aliasing filters feeding high-resolution ADCs. Use Value: 285 µVPP (0.1–10 Hz) noise enables clean biosignal acquisition; 3.0 V output matches common ADC input ranges. |
Use Scenario: In-vehicle BMS modules measuring cell voltages with 12-bit+ resolution across wide temperature gradients. IC Role / Device Role / Timing Role: Calibration reference for multiplexed cell voltage measurement ICs and protection comparators. Use Value: −40°C to +125°C operation and AEC-Q100 qualified variants (e.g., LM4128CQ1MF-3.0) support automotive under-hood environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3030AIDBZR | 3.0 V, ±0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-3, no enable pin | Lacks shutdown mode; lower tempco but higher accuracy grade; smaller 3-pin footprint | Select when lowest drift and minimal board area are prioritized over power gating capability. |
| MAX6033AESA30+ | 3.0 V, ±0.15% initial accuracy, 30 ppm/°C, 75 µA IQ, SO-8, no enable pin | Higher accuracy and lower tempco, but larger SO-8 package and no enable function | Choose for lab-grade instrumentation where long-term stability and ultra-low drift outweigh size and power constraints. |
Compared with REF3030AIDBZR and MAX6033AESA30+, the LM4128CMF-3.0 trades some accuracy and tempco for integrated enable control, micropower shutdown, and SOT-23-5 compatibility - making it optimal for space-constrained, battery-operated systems requiring dynamic power management.
Availability
LM4128CMF-3.0 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical patient monitors requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM4128CMF-3.0 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 analog semiconductor company 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 stable voltage references with enable control - targeting portable test equipment, battery-powered DAQ, and automotive sensor modules.
FAQ
What is the maximum input voltage for LM4128CMF-3.0?
The LM4128CMF-3.0 supports a maximum input voltage of 5.5 V. Operation above this level risks permanent damage. For reliable function, VIN must be ≥3.4 V (VREF + 400 mV) and ≤5.5 V, with recommended derating above 85°C ambient per thermal resistance specs.
Does LM4128CMF-3.0 require an input capacitor?
Yes - the LM4128CMF-3.0 requires a minimum 0.1 µF ceramic input capacitor (X5R/X7R) for stable operation. If an output capacitor is used, CIN must be ≥ COUT. Larger values (4.7–22 µF) reduce startup overshoot and improve PSRR, especially in noisy supply environments.
Can LM4128CMF-3.0 drive a 10 µF capacitive load?
Yes - the LM4128CMF-3.0 is explicitly characterized for stability with capacitive loads up to 10 µF, including low-ESR ceramic types. This eliminates need for series isolation resistors and simplifies layout in high-transient applications like servo position feedback.
What is the shutdown current of LM4128CMF-3.0?
The LM4128CMF-3.0 draws 3 µA typical (max 7 µA) supply current when the EN pin is held low (≤35% of VIN). This ultra-low shutdown current enables multi-year operation in energy-harvesting and intermittently active sensor nodes.
Is LM4128CMF-3.0 qualified for automotive use?
The base LM4128CMF-3.0 is not AEC-Q100 qualified, but its automotive-grade counterpart LM4128CQ1MF-3.0 is AEC-Q100 Grade 1 qualified and manufactured on an enhanced automotive flow. Both share identical electrical specs, but only the Q-variant is approved for under-hood automotive applications.
LM4128CMF-3.0 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):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 285µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3.4V ~ 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
LM4128CMF-3.0 FAQ
1.How can I place an order for LM4128CMF-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMF-3.0 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 LM4128CMF-3.0 reliable?
The price and inventory of LM4128CMF-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CMF-3.0 is usually 5 days.
3.What payment methods are accepted for LM4128CMF-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMF-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMF-3.0?
LM4128CMF-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMF-3.0 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 LM4128CMF-3.0?
For technical support, including LM4128CMF-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMF-3.0 requirements.
6.How does Aetrix verify that LM4128CMF-3.0 is sourced from the original manufacturer or authorized distributors?
All LM4128CMF-3.0 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 LM4128CMF-3.0 meets industry standards.
7.What is the process for return or replacement of LM4128CMF-3.0?
All LM4128CMF-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMF-3.0, 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 LM4128CMF-3.0 part is unused and in its original packaging.
Return procedure for LM4128CMF-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128CMF-3.0 Tags
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