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Texas Instruments LM4128CMF-4.1/NOPB
- Part No.:
- LM4128CMF-4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMF-4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:438
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Product details
Overview
LM4128CMF-4.1/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 4.096 V output with ±0.5% initial accuracy (C grade), 100 ppm/°C max temperature coefficient, and 60 µA supply current. It supports 20 mA output load, features enable control for 3–7 µA shutdown mode, and operates from −40°C to +125°C - ideal for battery-powered data acquisition and portable instrumentation.
For engineers reviewing the LM4128CMF-4.1/NOPB datasheet, LM4128CMF-4.1/NOPB pinout, LM4128CMF-4.1/NOPB application, or LM4128CMF-4.1/NOPB equivalent, this page provides verified specifications, validated pin functions, confirmed thermal and load regulation performance, and real-world application context for high-accuracy analog signal chains.
Technical Context
The LM4128CMF-4.1/NOPB uses an internal band-gap-derived reference core with active error correction to achieve low drift and high stability. Its enable input controls a high-impedance shutdown path that reduces quiescent current to ≤7 µA while maintaining fast 33–79 µs turn-on time depending on capacitive load.
Designed as a series reference, it eliminates need for external stabilization capacitors and remains stable with up to 10 µF capacitive loads. Input-to-output dropout is specified at 175–400 mV (10 mA load), and line/load regulation are characterized at 100 ppm/V and 25–120 ppm/mA respectively over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal, ±0.5% initial tolerance (C grade) - enables direct interface with 12-bit ADCs requiring 1 LSB = 1 mV at 4.096 V full scale. |
| Tempco | 100 ppm/°C max - ensures ≤±500 µV drift over −40°C to +125°C, critical for uncalibrated industrial sensor front-ends. |
| Supply Current | 60 µA typical - supports >1-year battery life in 10 µA average-power systems using coin-cell or Li-SOCl₂ sources. |
| Shutdown Current | 3–7 µA - allows deep-sleep operation in energy-harvesting nodes without external power gating. |
| Dropout Voltage | 175–400 mV at 10 mA - permits operation from single 4.5 V Li-ion cell with ≥400 mV headroom margin. |
| Noise (0.1–10 Hz) | 350 µVPP - meets <1 LSB noise requirement for 16-bit SAR ADCs sampling at ≤10 kSPS. |
| Load Current | Up to 20 mA - drives multiple op-amp bias networks or DAC reference inputs without external buffering. |
Pinout & Package
LM4128CMF-4.1/NOPB is housed in a 5-pin SOT-23 (DBV) package per JEDEC MO-178AB, with 0.95 mm pitch, 2.9 mm × 1.6 mm footprint, and 1.1 mm height. Pin 1 is marked by a dot; pin 3 (EN) is active-high with VIH ≥65% VIN and VIL ≤35% VIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect terminal - must remain floating; no internal connection or parasitic coupling. |
| 2 | GND | Analog ground reference - requires low-impedance PCB connection to minimize PSRR degradation and thermal EMF errors. |
| 3 | EN | Enable control input - pulls up internally (~2 µA); logic-high (≥65% VIN) activates reference; logic-low disables output and reduces IQ to ≤7 µA. |
| 4 | VIN | Input supply - accepts 4.496 V to 5.5 V (VREF + 400 mV min), with 260°C MSL-1 reflow compatibility. |
| 5 | VREF | Precision output - delivers regulated 4.096 V; stable with 0–10 µF ceramic COUT; requires ≥0.1 µF X5R/X7R CIN. |
Key Features
| Feature | Design Value |
|---|---|
| Stable without external compensation | Eliminates need for output capacitor - simplifies layout and reduces BOM count in space-constrained designs. |
| Capacitive load drive capability | Supports up to 10 µF COUT - improves transient response for multiplexed ADC references or multi-channel DACs. |
| Low thermal hysteresis | 75 ppm - minimizes calibration drift after thermal cycling in automotive or outdoor equipment. |
| Indefinite short-circuit protection | Limits output current to 75 mA - prevents damage during board-level test or fault conditions without external current limiting. |
| Long-term stability | 50 ppm over 1000 hours - reduces recalibration frequency in medical or metrology instruments. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
|
Use Scenario: Battery-operated environmental monitors logging temperature, humidity, and pressure at 1-minute intervals for 2+ years. IC Role / Device Role / Timing Role: Primary voltage reference for 16-bit sigma-delta ADC and microcontroller VREF input. Use Value: 60 µA supply current and 3–7 µA shutdown mode extend CR2032 battery life beyond 24 months; 4.096 V output matches ADC full-scale for integer-based firmware scaling. |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in hazardous zones with ambient temperatures from −40°C to +85°C. IC Role / Device Role / Timing Role: Precision reference for current-loop DAC and sensor signal conditioning amplifier. Use Value: 100 ppm/°C tempco and 75 ppm thermal hysteresis ensure ≤0.1% FS error across temperature extremes without field recalibration. |
| Medical Patient Monitors | Automotive Battery Management Systems |
|
Use Scenario: Portable ECG device acquiring biopotential signals with 12-bit resolution and clinical-grade accuracy. IC Role / Device Role / Timing Role: Reference source for analog front-end PGA and ADC, directly tied to electrode bias network. Use Value: 350 µVPP (0.1–10 Hz) noise ensures <1 µV RMS input-referred noise floor, meeting AAMI EC11 requirements for diagnostic ECG. |
Use Scenario: Cell voltage monitoring IC in 12S Li-ion BMS where reference accuracy directly impacts state-of-charge estimation. IC Role / Device Role / Timing Role: Stable 4.096 V reference for 12-bit SAR ADC measuring individual cell voltages with 1 mV resolution. Use Value: ±0.5% initial accuracy and 50 ppm long-term stability reduce SoC drift to <0.5% over 5-year vehicle lifetime without periodic recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3040AIDBZR | 4.096 V, ±0.2% initial accuracy (A grade), 50 ppm/°C, 50 µA IQ, SOT-23-3 - no enable pin, lower tempco, higher accuracy grade. | Requires external enable circuitry if shutdown needed; better suited for fixed-on applications like precision regulators. | Select when highest accuracy and lowest drift are prioritized over integrated enable control. |
| ADR3440ARJZ-R7 | 4.096 V, ±0.1% initial accuracy (A grade), 30 ppm/°C, 120 µA IQ, SOT-23-5 - includes enable, but higher supply current and tighter tempco. | Higher IQ limits battery life; superior tempco justifies use in high-stability lab equipment or calibration standards. | Select when ultra-low drift (<30 ppm/°C) outweighs micropower requirements and cost sensitivity. |
Compared with REF3040AIDBZR and ADR3440ARJZ-R7, LM4128CMF-4.1/NOPB offers optimal balance of integrated enable functionality, 60 µA micropower operation, and C-grade accuracy at lower cost - making it preferred for portable, battery-constrained systems where moderate drift is acceptable.
Availability
LM4128CMF-4.1/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical data acquisition systems requiring stable component supply with guaranteed long-term availability.
Supply support for LM4128CMF-4.1/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 ICs and industrial-grade reliability.
LM4128CMF-4.1/NOPB belongs to TI's precision micropower voltage reference product line, designed specifically for space-constrained, battery-powered applications demanding high accuracy, low drift, and robust thermal performance across extended temperature ranges.
FAQ
What is the output voltage tolerance and grade designation for LM4128CMF-4.1/NOPB?
The LM4128CMF-4.1/NOPB is a C-grade device with ±0.5% initial output voltage tolerance at 25°C, corresponding to ±20.5 mV deviation from its nominal 4.096 V output. This grade is documented in TI's SNVS475E datasheet under Electrical Characteristics for LM4128-4.1, and applies across the full −40°C to +125°C junction temperature range.
Does LM4128CMF-4.1/NOPB require an input bypass capacitor, and what value is recommended?
Yes, LM4128CMF-4.1/NOPB requires a minimum 0.1 µF ceramic (X5R or X7R) input capacitor (CIN) for stable operation. When an output capacitor (COUT) is used, CIN must be ≥ COUT. Larger values (4.7–22 µF) further reduce output noise and startup overshoot, as confirmed in TI's Typical Performance Characteristics and APPLICATION INFORMATION sections.
What is the maximum load current and dropout voltage specification for LM4128CMF-4.1/NOPB?
The LM4128CMF-4.1/NOPB supports up to 20 mA output current. Its dropout voltage is specified as 175–400 mV at 10 mA load, defined as the minimum VIN–VREF differential required to maintain output within 0.5% of nominal. This allows reliable operation from a 4.5 V supply while delivering full 4.096 V output.
How does the enable pin (EN) function on LM4128CMF-4.1/NOPB, and what are its voltage thresholds?
The EN pin on LM4128CMF-4.1/NOPB is active-high with VIH ≥65% VIN and VIL ≤35% VIN. When pulled high (e.g., to VIN), the device operates normally; when pulled low or left floating (relying on internal ~2 µA pull-up), it enters shutdown mode drawing ≤7 µA. The pin has no internal ESD diode to VIN or GND, per Absolute Maximum Ratings.
Is LM4128CMF-4.1/NOPB stable with large capacitive loads, and what is the maximum supported value?
Yes, LM4128CMF-4.1/NOPB is explicitly characterized for stability with capacitive loads up to 10 µF, as stated in the FEATURES section and confirmed in the APPLICATION INFORMATION. It remains stable both with and without COUT, eliminating need for external isolation resistors or compensation networks typically required by older reference architectures.
LM4128CMF-4.1/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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 350µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.496V ~ 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-4.1/NOPB FAQ
1.How can I place an order for LM4128CMF-4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMF-4.1/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 LM4128CMF-4.1/NOPB reliable?
The price and inventory of LM4128CMF-4.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CMF-4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CMF-4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMF-4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMF-4.1/NOPB?
LM4128CMF-4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMF-4.1/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 LM4128CMF-4.1/NOPB?
For technical support, including LM4128CMF-4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMF-4.1/NOPB requirements.
6.How does Aetrix verify that LM4128CMF-4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CMF-4.1/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 LM4128CMF-4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CMF-4.1/NOPB?
All LM4128CMF-4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMF-4.1/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 LM4128CMF-4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4128CMF-4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128CMF-4.1/NOPB Tags
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