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Texas Instruments LM4128BMF-2.0
- Part No.:
- LM4128BMF-2.0
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMF-2.0.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,566
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Product details
Overview
LM4128BMF-2.0 from National Semiconductor is a precision micropower series voltage reference in SOT-23-5 package, delivering 2.048 V output with ±0.2% initial accuracy, 75 ppm/°C temperature coefficient, and 60 µA quiescent current - optimized for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128BMF-2.0 datasheet, LM4128BMF-2.0 pinout, LM4128BMF-2.0 application, or LM4128BMF-2.0 equivalent, key selection considerations include dropout voltage (≤400 mV at 10 mA), enable-controlled shutdown (3 µA), load regulation (≤120 ppm/mA), stability with up to 10 µF capacitive loads, and operation across −40°C to +125°C.
Technical Context
The LM4128BMF-2.0 employs a band-gap–derived series reference architecture with integrated enable control, eliminating external stabilization capacitors while maintaining stability under capacitive loads up to 10 µF. Its low dropout (400 mV) and micropower operation (60 µA) support direct regulation from single-cell Li-ion or alkaline supplies.
It features a dedicated EN pin with 35%–65% VIN logic thresholds, enabling seamless integration into power-managed systems. The device achieves 75 ppm/°C tempco via curvature-compensated design and exhibits 190 µV thermal hysteresis over −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal - matches common 12-bit DAC/ADC full-scale references and enables precise 1 LSB scaling. |
| Initial Accuracy | ±0.2% at 25°C - ensures ≤4.1 mV absolute error without calibration in portable test equipment. |
| Tempco | 75 ppm/°C max - limits drift to ≤18.6 µV/°C over industrial temperature range, critical for precision sensor front-ends. |
| Quiescent Current | 60 µA - supports >1-year battery life in 10 µA-sleep microcontroller systems with periodic measurement cycles. |
| Dropout Voltage | 400 mV at 10 mA - allows operation from 2.45 V input, compatible with discharged Li-ion (2.7 V min) and dual-alkaline (3.0 V) sources. |
| Shutdown Current | 3 µA - reduces system standby power by >95% vs active mode, essential for always-on IoT edge nodes. |
| Load Regulation | 120 ppm/mA max - maintains <246 µV change per mA load shift, suitable for driving ADC reference inputs with dynamic SAR conversion currents. |
Pinout & Package
SOT-23-5 package (NS MF05A), 1.6 mm × 2.9 mm footprint, 1.1 mm height, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin - must remain unconnected and floating; not internally bonded. |
| 2 | GND | Analog ground reference - requires low-impedance connection to clean system ground plane to minimize noise coupling. |
| 3 | EN | Active-high enable input - pulls up internally (~2 µA); driven high (>65% VIN) to activate, low (<35% VIN) to enter 3 µA shutdown. |
| 4 | VIN | Input supply - accepts 2.45 V to 5.5 V; must exceed VREF + 400 mV for regulation; requires ≥0.1 µF ceramic bypass capacitor. |
| 5 | VREF | Precision 2.048 V output - drives ADC/DAC references, sensor excitation, or comparator thresholds; stable with 0–10 µF capacitive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates stably without mandatory output capacitor - simplifies layout and reduces BOM count in space-constrained designs. |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault - prevents damage when VREF is accidentally shorted to GND or VIN. |
| Low-noise output | 190 µVPP (0.1–10 Hz) - minimizes quantization uncertainty in 16-bit+ data acquisition systems. |
| Wide junction temperature range | −40°C to +125°C operation - qualified for under-hood automotive and industrial motor-control environments. |
| Line regulation | 30 ppm/V - maintains output stability despite input rail sag during battery discharge or switching regulator ripple. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure every 10 seconds using a 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Provides stable 2.048 V reference for ADC conversion and sensor excitation biasing. Use Value: Enables ≤0.003% total unadjusted error (TUE) over −25°C to +70°C, extending field calibration intervals to 2 years. |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in oil-field wellheads (−40°C to +85°C). IC Role / Device Role / Timing Role: Supplies precision reference for analog front-end gain/offset trimming and DAC-based current loop control. Use Value: Maintains <±0.1% output accuracy across temperature with no external calibration, reducing manufacturing test time by 40%. |
| Medical Patient Monitors | Automotive Battery Management ICs |
Use Scenario: Portable ECG module acquiring biopotential signals with 12-bit resolution and 1 kSPS sampling. IC Role / Device Role / Timing Role: References the ADC and powers low-noise op-amp stages in the analog signal chain. Use Value: 190 µVPP low-frequency noise avoids baseline wander artifacts, improving diagnostic waveform fidelity. |
Use Scenario: Cell-voltage monitoring IC in 12S Li-ion battery pack for EV traction inverters. IC Role / Device Role / Timing Role: Supplies accurate reference for 14-bit SAR ADC measuring individual cell voltages (±1 mV target). Use Value: 75 ppm/°C tempco ensures ≤1.5 mV error over −40°C to +105°C, meeting ASIL-B functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126BASA20+ | 2.048 V, ±0.1% initial accuracy, 3 ppm/°C tempco, 65 µA IQ, SO-8 package | Higher precision and lower drift, but larger footprint and no enable pin | Select for metrology-grade instruments where size is secondary to long-term stability. |
| REF3020AIDBZR | 2.048 V, ±0.2% initial accuracy, 50 ppm/°C tempco, 50 µA IQ, SOT-23-3 (no EN) | Lower tempco and quiescent current, but lacks enable control and has no N/C pin | Select for ultra-low-power systems requiring minimal sleep current and no active enable sequencing. |
Compared with MAX6126BASA20+ and REF3020AIDBZR, the LM4128BMF-2.0 uniquely balances B-grade accuracy, integrated enable functionality, and SOT-23-5 compatibility - making it optimal for cost-sensitive, space-constrained, and power-gated portable instrumentation where moderate tempco is acceptable.
Availability
LM4128BMF-2.0 is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, battery management systems, and precision data loggers requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128BMF-2.0 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 applications.
The LM4128 series was designed specifically for micropower, space-constrained, and wide-temperature applications - targeting portable instrumentation, sensor signal conditioning, and battery-operated measurement systems where low dropout and enable control are critical.
FAQ
What is the maximum input voltage for LM4128BMF-2.0?
The LM4128BMF-2.0 supports a maximum input voltage of 5.5 V. Operation above this level risks permanent damage per Absolute Maximum Ratings. For reliable regulation, VIN must be ≥ VREF + 400 mV (i.e., ≥2.448 V at 25°C), and the device remains functional up to 5.5 V across −40°C to +125°C junction temperatures.
Does LM4128BMF-2.0 require an external output capacitor?
No, the LM4128BMF-2.0 is stable without an external output capacitor and is certified for use with capacitive loads up to 10 µF. An output capacitor is optional but recommended to improve load transient response - especially when driving ADC reference inputs that draw pulsed currents. COUT values between 100 nF and 1 µF are typical.
What is the function of Pin 1 (N/C) on LM4128BMF-2.0?
Pin 1 of the LM4128BMF-2.0 is a no-connect (N/C) terminal - it is not bonded internally and must remain unconnected and floating in the PCB layout. Soldering or routing to this pin may introduce parasitic leakage paths or mechanical stress that degrades output voltage accuracy or long-term stability.
How does the enable pin (Pin 3) operate on LM4128BMF-2.0?
The enable pin (Pin 3) of LM4128BMF-2.0 is active-high with internal ~2 µA pull-up. It enters normal operation when voltage exceeds 65% of VIN and shuts down to 3 µA when below 35% of VIN. The pin may be tied directly to VIN for always-on use or driven by a GPIO to gate reference power in sleep/wake cycles - with no external pull-up required.
What is the typical turn-on time for LM4128BMF-2.0?
The LM4128BMF-2.0 has a typical turn-on time of 33.2 µs into a 1 µF load and 78.8 µs into a 10 µF load, measured from EN rising edge to VREF reaching 90% of 2.048 V. Under brown-out conditions (<2.5 V VIN) or at −40°C, turn-on time may extend up to 10 ms due to reduced internal bias currents and slower internal settling.
LM4128BMF-2.0 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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- 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
LM4128BMF-2.0 FAQ
1.How can I place an order for LM4128BMF-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMF-2.0 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 LM4128BMF-2.0 reliable?
The price and inventory of LM4128BMF-2.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BMF-2.0 is usually 5 days.
3.What payment methods are accepted for LM4128BMF-2.0?
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4.How is shipping managed for LM4128BMF-2.0?
LM4128BMF-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMF-2.0 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 LM4128BMF-2.0?
For technical support, including LM4128BMF-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMF-2.0 requirements.
6.How does Aetrix verify that LM4128BMF-2.0 is sourced from the original manufacturer or authorized distributors?
All LM4128BMF-2.0 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 LM4128BMF-2.0 meets industry standards.
7.What is the process for return or replacement of LM4128BMF-2.0?
All LM4128BMF-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMF-2.0, 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 LM4128BMF-2.0 part is unused and in its original packaging.
Return procedure for LM4128BMF-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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