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Texas Instruments LM4128CQ1MFX2.0/NOPB
- Part No.:
- LM4128CQ1MFX2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CQ1MFX2.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,089
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Product details
Overview
LM4128CQ1MFX2.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) 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 instrumentation and automotive-grade data acquisition systems.
For engineers reviewing the LM4128CQ1MFX2.0/NOPB datasheet, LM4128CQ1MFX2.0/NOPB pinout, LM4128CQ1MFX2.0/NOPB application, or LM4128CQ1MFX2.0/NOPB equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade thermal performance, and real-world design context for precision analog signal chains requiring stable, low-power reference voltage generation.
Technical Context
The LM4128CQ1MFX2.0/NOPB uses an internal band-gap-derived reference core with active output buffering, enabling stable operation without external stabilization capacitors while supporting capacitive loads up to 10 µF. Its enable input controls a high-impedance shutdown state that reduces quiescent current to 3–7 µA.
This device operates as a series reference with dropout voltage of 175–400 mV at 10 mA load, line regulation of 30 ppm/V, and load regulation of 25–120 ppm/mA - all specified across −40°C to +125°C. It is AEC-Q100 Grade 1 qualified and manufactured on an automotive-grade flow.
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 systems |
| Tempco | 100 ppm/°C max; contributes ≤0.25 mV drift over −40°C to +125°C ambient range |
| Supply Current | 60 µA typical; allows >1-year battery life in 10 µA-sleep IoT sensor nodes |
| Shutdown Current | 3–7 µA; enables ultra-low-power wake-on-event architectures with EN pin control |
| Dropout Voltage | 175–400 mV at 10 mA; supports operation from single-cell Li-ion (3.0–4.2 V) or 3.3 V rails |
| Output Noise | 190 µVPP (0.1–10 Hz); meets <1 LSB noise requirement for 16-bit SAR ADCs |
Pinout & Package
LM4128CQ1MFX2.0/NOPB is housed in a 5-pin SOT-23 (DBV) package per JEDEC MO-178AB, with 0.95 mm pitch and 2.9 mm × 1.6 mm footprint. Pin 1 is marked by a dot; pin 3 is EN, pin 4 is VIN, and pin 5 is VREF - no internal connection on pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | N/C | No-connect terminal; must remain floating - not tied to GND or any bias |
| Pin 2 | GND | Analog ground reference; requires low-impedance PCB plane connection for noise immunity |
| Pin 3 | EN | Active-high enable; ≥65% of VIN required for turn-on; internal 2 µA pull-up allows direct tie-to-VIN |
| Pin 4 | VIN | Input supply; must exceed VREF + 400 mV (≥2.448 V) for regulation; max 5.5 V |
| Pin 5 | VREF | Precision output; drives up to 20 mA; stable with 0–10 µF ceramic capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood operation (−40°C to +125°C junction) |
| No external capacitor required | Eliminates COUT dependency; simplifies layout and reduces BOM count in space-constrained designs |
| Stable with low-ESR ceramics | Enables use of X5R/X7R MLCCs (0.1–10 µF) without phase-margin risk or oscillation |
| Indefinite short-circuit protection | Self-limits output to 75 mA during fault; recovers automatically when short removed |
| Low thermal hysteresis | 75 ppm max; preserves calibration integrity after repeated thermal cycling in industrial environments |
Applications
| Automotive Battery Monitoring | Portable Medical Sensors |
|---|---|
|
Use Scenario: Real-time cell voltage measurement in 12 V lead-acid or 48 V EV battery packs using 16-bit ADCs. IC Role / Device Role / Timing Role: Precision reference for ADC conversion; provides stable 2.048 V full-scale reference independent of supply rail variation. Use Value: Enables ±0.5% voltage reading accuracy across temperature, meeting ISO 16750-4 transient immunity requirements. |
Use Scenario: ECG front-end signal conditioning in handheld patient monitors with 5-year battery life target. IC Role / Device Role / Timing Role: Low-noise, low-quiescent reference for instrumentation amplifier gain-setting and ADC reference. Use Value: 190 µVPP (0.1–10 Hz) noise and 60 µA supply current extend runtime while preserving diagnostic signal fidelity. |
| Industrial Data Loggers | Smart Grid Meters |
|
Use Scenario: Multi-channel temperature/pressure sensing in oil & gas remote telemetry units operating at −40°C. IC Role / Device Role / Timing Role: Primary voltage reference for sigma-delta ADCs sampling thermocouple and RTD signals. Use Value: 100 ppm/°C tempco and 75 ppm thermal hysteresis ensure <0.01% measurement drift over field lifetime. |
Use Scenario: Revenue-grade energy metering ICs requiring metrology-grade reference stability over 20-year service life. IC Role / Device Role / Timing Role: High-accuracy reference for polyphase energy measurement ASICs with integrated 24-bit ADCs. Use Value: ±0.5% initial accuracy and 50 ppm long-term stability (1000 hrs) support ANSI C12.20 Class 0.2 compliance. |
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, ±0.06% initial accuracy, 3 ppm/°C tempco, 0.9 µA IQ, SO-8 package | Higher precision and lower noise, but larger footprint and no enable pin | Select for metrology-grade lab equipment where size and shutdown are secondary to accuracy |
| ADR3420ARJZ-R7 | 2.048 V, ±0.1% initial accuracy, 10 ppm/°C tempco, 120 µA IQ, SOT-23-5 package | Better tempco and tighter initial tolerance, but higher supply current and no AEC-Q100 rating | Select for industrial PLC analog I/O modules needing improved drift performance without automotive qualification |
Compared with MAX6126AASA20+ and ADR3420ARJZ-R7, LM4128CQ1MFX2.0/NOPB uniquely balances automotive qualification, ultra-low IQ, enable functionality, and SOT-23 footprint - making it optimal for cost-sensitive, battery-aware automotive and industrial edge sensors where AEC-Q100 compliance is mandatory.
Availability
LM4128CQ1MFX2.0/NOPB is available at Aetrix Electronics and suitable for automotive battery monitoring, portable medical sensors, industrial data loggers, and smart grid meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128CQ1MFX2.0/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 focused on analog and embedded processing technologies, with decades of expertise in precision analog ICs and automotive-qualified components.
LM4128CQ1MFX2.0/NOPB belongs to TI's precision voltage reference product line, designed specifically for high-reliability automotive and industrial applications demanding AEC-Q100 Grade 1 operation, low power, and robust thermal performance.
FAQ
What is the maximum input voltage for LM4128CQ1MFX2.0/NOPB?
The LM4128CQ1MFX2.0/NOPB supports a maximum input voltage of 5.5 V. Operation above this level risks permanent damage. The minimum input is VREF + 400 mV (≥2.448 V) for proper regulation at 10 mA load. Input voltage must remain within these bounds across all operating temperatures and load conditions to ensure reliable performance of LM4128CQ1MFX2.0/NOPB.
Does LM4128CQ1MFX2.0/NOPB require an external output capacitor?
No, LM4128CQ1MFX2.0/NOPB is internally compensated and stable without an output capacitor. It remains stable with capacitive loads up to 10 µF, including optional COUT for improved transient response. An input capacitor (CIN ≥ 0.1 µF) is mandatory; CIN must be ≥ COUT if both are used. This architecture simplifies design and reduces bill-of-materials cost for LM4128CQ1MFX2.0/NOPB implementations.
What does the 'CQ' suffix indicate in LM4128CQ1MFX2.0/NOPB?
The 'CQ' suffix denotes AEC-Q100 Grade 1 qualification and automotive-grade manufacturing flow. 'C' specifies ±0.5% initial accuracy (C grade), and 'Q' confirms automotive qualification. LM4128CQ1MFX2.0/NOPB is rated for −40°C to +125°C junction temperature and undergoes additional stress testing per AEC-Q100 standards - distinguishing it from commercial-grade LM4128 variants and confirming its suitability for automotive applications.
How does the enable pin function on LM4128CQ1MFX2.0/NOPB?
The enable pin (Pin 3) is active-high with VIH ≥ 65% of VIN and VIL ≤ 35% of VIN. When pulled high (≥65% VIN), LM4128CQ1MFX2.0/NOPB regulates normally; when pulled low (≤35% VIN), it enters shutdown with 3–7 µA supply current. An internal 2 µA pull-up allows direct connection to VIN for always-on operation. This EN functionality enables dynamic power gating in LM4128CQ1MFX2.0/NOPB-based sensor nodes.
Is LM4128CQ1MFX2.0/NOPB compatible with standard SOT-23 footprints?
Yes, LM4128CQ1MFX2.0/NOPB uses the industry-standard 5-pin SOT-23 (DBV) package per JEDEC MO-178AB, with 0.95 mm pin pitch and 2.9 mm × 1.6 mm body dimensions. It is compatible with standard SOT-23 reflow profiles (MSL Level-1, peak 260°C) and fits existing pick-and-place tooling and stencil apertures used for other DBV-packaged devices - ensuring seamless integration into LM4128CQ1MFX2.0/NOPB production lines.
LM4128CQ1MFX2.0/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128CQ1MFX2.0/NOPB FAQ
1.How can I place an order for LM4128CQ1MFX2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CQ1MFX2.0/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 LM4128CQ1MFX2.0/NOPB reliable?
The price and inventory of LM4128CQ1MFX2.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CQ1MFX2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CQ1MFX2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CQ1MFX2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CQ1MFX2.0/NOPB?
LM4128CQ1MFX2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CQ1MFX2.0/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 LM4128CQ1MFX2.0/NOPB?
For technical support, including LM4128CQ1MFX2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CQ1MFX2.0/NOPB requirements.
6.How does Aetrix verify that LM4128CQ1MFX2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CQ1MFX2.0/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 LM4128CQ1MFX2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CQ1MFX2.0/NOPB?
All LM4128CQ1MFX2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CQ1MFX2.0/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 LM4128CQ1MFX2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128CQ1MFX2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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