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Texas Instruments LM4128CMF-2.0/NOPB
- Part No.:
- LM4128CMF-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMF-2.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,962
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Product details
Overview
LM4128CMF-2.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 2.048 V output with ±0.5% initial accuracy, 100 ppm/°C temperature coefficient, and 60 µA supply 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 data acquisition systems requiring stable low-power reference.
For engineers reviewing the LM4128CMF-2.0/NOPB datasheet, LM4128CMF-2.0/NOPB pinout, LM4128CMF-2.0/NOPB application, or LM4128CMF-2.0/NOPB equivalent, key selection criteria include initial accuracy grade (C = ±0.5%), dropout voltage (≤400 mV at 10 mA), stability with capacitive loads up to 10 µF, and compatibility with ceramic bypass capacitors without external compensation.
Technical Context
The LM4128CMF-2.0/NOPB uses an internal band-gap-derived architecture optimized for low quiescent current and high PSRR. Its enable input controls a high-impedance shutdown state, reducing supply current to 3–7 µA while maintaining fast wake-up response.
It achieves stable regulation across input voltages from (VREF + 400 mV) to 5.5 V, supports load currents up to 20 mA, and maintains output accuracy under line regulation (≤70 ppm/V) and load regulation (≤120 ppm/mA) per the C-grade specification at −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; enables precise 12-bit ADC full-scale alignment without trimming |
| Initial Accuracy | ±0.5% (C grade); ensures ≤10.24 mV absolute error at 25°C for calibration-critical designs |
| Tempco | 100 ppm/°C max; contributes ≤246 ppm (0.05% of 2.048 V) drift over −40°C to +125°C span |
| Supply Current | 60–100 µA active; allows >1-year operation on a 220 mAh coin cell in intermittent-sampling systems |
| Shutdown Current | 3–7 µA; reduces average power by >90% during sleep cycles in portable instrumentation |
| Dropout Voltage | 175–400 mV at 10 mA; permits operation from single Li-ion (3.0–4.2 V) or 3.3 V rail with margin |
| Noise (0.1–10 Hz) | 190 µVPP; supports <16-bit ENOB in low-frequency sensor signal chains |
Pinout & Package
LM4128CMF-2.0/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package with 1.27 mm pitch, rated for −40°C to +125°C junction temperature and compatible with standard reflow profiles (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected and floating; no PCB trace or pad required |
| 2 (GND) | Analog ground reference | Low-impedance return path for reference output; requires dedicated ground plane connection |
| 3 (EN) | Enable control input | Active-high logic; VIH ≥65% VIN, VIL ≤35% VIN; drives shutdown when pulled low |
| 4 (VIN) | Input supply | Accepts 2.448 V to 5.5 V; must exceed VREF by ≥400 mV for regulation at 10 mA load |
| 5 (VREF) | Precision reference output | 2.048 V source with ≤120 ppm/mA load regulation; requires ≥0.1 µF ceramic CIN and optional COUT |
Key Features
| Feature | Design Value |
|---|---|
| Grade-C precision | Guaranteed ±0.5% initial accuracy and 100 ppm/°C tempco over full industrial temperature range |
| Capacitor-free stability | Stable with no output capacitor; supports up to 10 µF capacitive loads without oscillation or phase margin loss |
| Ultra-low shutdown current | 3–7 µA shutdown IQ enables microcontroller-gated power cycling in energy-harvesting nodes |
| Low-noise output | 190 µVPP (0.1–10 Hz) supports high-resolution delta-sigma ADCs without external filtering |
| Dropout-tolerant operation | Operates down to VIN = VREF + 175 mV (typ.) - suitable for post-LDO or battery-depleted rails |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitoring node sampling thermistors and RTDs at 1–10 Hz. IC Role / Device Role / Timing Role: Precision voltage reference for 16-bit SAR ADC front-end, providing stable full-scale reference independent of battery voltage decay. Use Value: Enables ±0.1°C temperature resolution over 10-year deployment without field recalibration due to 50 ppm long-term stability and low thermal hysteresis. |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in hazardous zones with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary reference for DAC-based current loop controller, referenced against isolated 3.3 V supply. Use Value: Maintains <±0.2% total error over −40°C to +85°C via 100 ppm/°C tempco and robust line/load regulation, meeting SIL-2 functional safety requirements. |
| Medical Patient Monitors | Automotive Battery Management Units |
Use Scenario: Portable ECG device acquiring biopotential signals with 24-bit delta-sigma ADC and real-time digital filtering. IC Role / Device Role / Timing Role: Low-noise analog reference for ADC and programmable gain amplifier biasing. Use Value: 190 µVPP noise floor preserves signal integrity below 1 µV; shutdown mode extends single-charge battery life to >72 hours. |
Use Scenario: Cell voltage measurement IC in 12S BMS, where reference accuracy directly impacts SoC estimation fidelity. IC Role / Device Role / Timing Role: Stable 2.048 V reference for 16-bit ADC measuring 0–5 V cell stack segments. Use Value: ±0.5% initial accuracy and 100 ppm/°C drift ensure <1.5 mV absolute error across automotive temperature range, improving SoC accuracy by ≥2.5%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AASA20+ | 2.048 V, ±0.1% initial accuracy (A-grade), 3 ppm/°C tempco, 35 µA IQ, SO-8 package | Higher accuracy and lower drift; requires larger footprint and external decoupling | Select when system-level accuracy demands <±0.05% total error over temperature and time |
| ADR3420ARJZ-R7 | 2.048 V, ±0.1% initial accuracy, 10 ppm/°C tempco, 120 µA IQ, SOT-23-5 package | Lower tempco but higher supply current; same pinout but different enable behavior (active-low) | Prefer when thermal stability dominates power budget, and board layout accommodates revised EN logic |
Compared with LM4128CMF-2.0/NOPB, MAX6126AASA20+ offers superior accuracy and drift but increases PCB area and cost; ADR3420ARJZ-R7 matches the SOT-23-5 footprint and voltage but trades 60 µA IQ for 10 ppm/°C drift - making it suitable for thermally aggressive environments where power is less constrained.
Availability
LM4128CMF-2.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, medical patient monitors, and automotive battery management units requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4128CMF-2.0/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.
The LM4128 product line delivers micropower, high-accuracy series voltage references for space-constrained, battery-operated, and wide-temperature applications - designed specifically for data acquisition, sensor conditioning, and portable medical equipment.
FAQ
What is the guaranteed initial accuracy of LM4128CMF-2.0/NOPB over temperature?
The LM4128CMF-2.0/NOPB is specified as a C-grade device with ±0.5% initial accuracy at 25°C, and this tolerance is maintained across the full −40°C to +125°C operating junction temperature range per TI's production test limits. The part does not degrade beyond ±0.5% solely due to temperature shift - drift is governed separately by the 100 ppm/°C tempco specification.
Does LM4128CMF-2.0/NOPB require an external output capacitor to remain stable?
No - the LM4128CMF-2.0/NOPB is internally compensated and remains stable without any output capacitor. An optional COUT (up to 10 µF) may be added to improve load transient response, but it is never required for stability. Input capacitor CIN (≥0.1 µF ceramic) is mandatory for proper operation.
What is the minimum input voltage required for LM4128CMF-2.0/NOPB to regulate at full 20 mA load?
For 20 mA load, LM4128CMF-2.0/NOPB requires VIN ≥ VREF + dropout voltage. At 10 mA, dropout is specified as 175–400 mV; extrapolating conservatively, VIN ≥ 2.048 V + 0.4 V = 2.448 V is required. TI confirms operation down to VREF + 400 mV across all load conditions up to 20 mA.
Can LM4128CMF-2.0/NOPB drive a 10 µF ceramic capacitor directly at its output?
Yes - the LM4128CMF-2.0/NOPB is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, including low-ESR X5R/X7R ceramics. This capability eliminates need for series isolation resistors or external compensation networks typically required by older reference architectures.
How does the enable pin (EN) function on LM4128CMF-2.0/NOPB, and what logic levels activate it?
The EN pin on LM4128CMF-2.0/NOPB is active-high with VIH ≥65% of VIN and VIL ≤35% of VIN. When EN is pulled low (≤35% VIN), the device enters shutdown mode drawing only 3–7 µA. Leaving EN open or tying it to VIN enables normal operation. Driving EN above VIN is prohibited and may damage the part.
LM4128CMF-2.0/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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°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
LM4128CMF-2.0/NOPB FAQ
1.How can I place an order for LM4128CMF-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMF-2.0/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-2.0/NOPB reliable?
The price and inventory of LM4128CMF-2.0/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-2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CMF-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMF-2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMF-2.0/NOPB?
LM4128CMF-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMF-2.0/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-2.0/NOPB?
For technical support, including LM4128CMF-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMF-2.0/NOPB requirements.
6.How does Aetrix verify that LM4128CMF-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CMF-2.0/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-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CMF-2.0/NOPB?
All LM4128CMF-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMF-2.0/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-2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128CMF-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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