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Texas Instruments LM4128BQ1MFX2.5/NOPB
- Part No.:
- LM4128BQ1MFX2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BQ1MFX2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,072
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Product details
Overview
LM4128BQ1MFX2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 2.5 V output with ±0.2% initial accuracy, 75 ppm/°C max temperature coefficient, and 60 µA supply current. It features an enable pin for 3 µA shutdown mode and supports up to 20 mA load current - ideal for battery-powered instrumentation and automotive-grade data acquisition systems.
For engineers reviewing the LM4128BQ1MFX2.5/NOPB datasheet, LM4128BQ1MFX2.5/NOPB pinout, LM4128BQ1MFX2.5/NOPB application, or LM4128BQ1MFX2.5/NOPB equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, dropout voltage of 175–400 mV at 10 mA, stability with capacitive loads up to 10 µF, and guaranteed performance across −40°C to +125°C junction temperature.
Technical Context
The LM4128BQ1MFX2.5/NOPB uses an internal band-gap-derived reference core with active error correction to achieve low drift and high initial accuracy. Its enable input controls a high-impedance shutdown path that reduces quiescent current to 3–7 µA while maintaining fast wake-up response.
This device operates as a series reference requiring VIN ≥ VREF + 400 mV (i.e., ≥2.9 V at 10 mA), eliminates need for external stabilization capacitor, and remains stable driving ceramic loads from 0 to 10 µF - enabling compact, low-noise analog front-end designs in space-constrained automotive and industrial modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.2% initial accuracy (B grade) - ensures ≤±5 mV absolute error at 25°C for 12-bit ADC biasing |
| Tempco | 75 ppm/°C max - limits drift to ≤±225 µV over −40°C to +125°C range, critical for precision sensor signal chains |
| Supply Current | 60 µA typical - enables multi-year operation on coin-cell batteries in portable test equipment |
| Shutdown Current | 3–7 µA with EN = 0 V - allows deep-sleep power management in automotive ECUs without external switches |
| Dropout Voltage | 175–400 mV at 10 mA - supports operation from single Li-ion or 3.3 V rail with margin for aging and ripple |
| Noise (0.1–10 Hz) | 275 µVPP - meets SNR requirements for 16-bit SAR ADCs in medical and process control applications |
| Load Regulation | 25–120 ppm/mA - maintains <±0.3 mV output shift from 0 to 20 mA, suitable for driving DAC reference inputs |
Pinout & Package
LM4128BQ1MFX2.5/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package (2.9 mm × 1.6 mm × 1.15 mm), qualified per AEC-Q100 Grade 1 for automotive use. Pin 1 is no-connect (N/C); pins are arranged top-view with standard DBV pinout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected and floating - no PCB trace or thermal pad required |
| 2 (GND) | Analog ground reference | Primary return path for reference core and output stage; requires low-impedance connection to clean AGND plane |
| 3 (EN) | Enable control input | Active-high logic input (VIH ≥65% VIN); pulls up internally with ~2 µA - compatible with microcontroller GPIO |
| 4 (VIN) | Input supply | Accepts 2.9 V to 5.5 V; must exceed VREF + 400 mV under load to maintain regulation |
| 5 (VREF) | Precision output | 2.5 V reference source capable of sourcing up to 20 mA; stable with 0–10 µF ceramic capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Guarantees operation from −40°C to +125°C junction temperature in automotive powertrain and ADAS modules |
| No external stabilization capacitor needed | Reduces BOM count and board area vs shunt references; simplifies layout for high-reliability embedded systems |
| Stable with 0–10 µF capacitive loads | Enables direct interface to ADC/DAC reference inputs and op-amp feedback networks without phase-margin tuning |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault conditions - prevents damage during ESD events or miswiring |
| Low thermal hysteresis (75 ppm) | Minimizes calibration drift after thermal cycling in field-deployed test equipment and industrial controllers |
Applications
| Automotive Sensor Signal Conditioning | Portable Data Logger Reference |
|---|---|
Use Scenario: High-accuracy temperature and pressure sensor front-end in engine control units. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for 16-bit sigma-delta ADCs digitizing sensor outputs. Use Value: Enables <±0.05% total measurement error over full automotive temperature range with no recalibration. |
Use Scenario: Battery-powered environmental monitoring node logging humidity, CO₂, and light levels. IC Role / Device Role / Timing Role: Supplies reference voltage to ultra-low-power SAR ADC and microcontroller ADC subsystem. Use Value: Delivers 2.5 V reference with 60 µA supply current, extending 10-year battery life using CR2032 cells. |
| Medical Patient Monitor Analog Front-End | Industrial PLC Input Module Calibration |
Use Scenario: ECG and pulse oximetry signal chain requiring sub-mV baseline stability. IC Role / Device Role / Timing Role: Precision reference for instrumentation amplifiers and anti-aliasing filters. Use Value: 275 µVPP (0.1–10 Hz) noise and 75 ppm/°C tempco meet IEC 60601-1 low-frequency accuracy requirements. |
Use Scenario: Modular analog input card for programmable logic controllers accepting 4–20 mA and 0–10 V signals. IC Role / Device Role / Timing Role: Primary reference for 24-bit delta-sigma ADCs performing channel calibration and linearization. Use Value: ±0.2% initial accuracy and 50 ppm long-term stability ensure <±0.1% gain error over 10-year product lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5 V, ±0.2% accuracy, 100 ppm/°C max tempco, 50 µA IQ, SOT-23-5 - lacks enable pin and AEC-Q100 qualification | Targeted at commercial-grade portable instruments; not rated for automotive temperature or reliability stress | Select when cost sensitivity outweighs automotive qualification and shutdown capability |
| MAX6025AEUR+T | 2.5 V, ±0.15% accuracy, 50 ppm/°C max tempco, 35 µA IQ, SOT-23-5 - no enable pin, no AEC-Q100 rating | Suitable for high-precision lab equipment where ultra-low drift dominates over power management | Prefer when long-term stability (30 ppm/1k hrs) and lower tempco justify absence of enable control |
Compared with REF3025AIDBZR and MAX6025AEUR+T, LM4128BQ1MFX2.5/NOPB uniquely combines AEC-Q100 Grade 1 qualification, integrated enable functionality, and guaranteed 75 ppm/°C tempco - making it the only drop-in solution for automotive-qualified, low-power, precision reference designs requiring system-level sleep/wake coordination.
Availability
LM4128BQ1MFX2.5/NOPB is available at Aetrix Electronics and suitable for automotive sensor modules, portable data loggers, medical patient monitors, and industrial PLC input modules requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LM4128BQ1MFX2.5/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, serving automotive, industrial, and communications markets with high-reliability components.
The LM4128 series was designed specifically for space-constrained, battery-operated, and automotive-grade applications demanding precision, low power, and robust thermal performance - with LM4128BQ1MFX2.5/NOPB targeting AEC-Q100-compliant systems requiring 2.5 V reference stability.
FAQ
What is the operating temperature range for LM4128BQ1MFX2.5/NOPB?
The LM4128BQ1MFX2.5/NOPB is qualified per AEC-Q100 Grade 1 and operates across a junction temperature range of −40°C to +125°C. This specification is validated through accelerated stress testing and applies to all electrical parameters in the datasheet's boldface limits, ensuring reliable performance in under-hood automotive and industrial environments where thermal extremes occur.
Does LM4128BQ1MFX2.5/NOPB require an input capacitor?
Yes, LM4128BQ1MFX2.5/NOPB requires an input capacitor (CIN) for stable operation. The datasheet specifies CIN ≥ COUT, with a minimum of 0.1 µF when no output capacitor is used. A 0.1–1 µF X5R/X7R ceramic capacitor placed close to the VIN and GND pins is recommended to suppress supply noise and prevent startup overshoot - especially critical in battery-powered systems with high-impedance sources.
What is the maximum load current supported by LM4128BQ1MFX2.5/NOPB?
The LM4128BQ1MFX2.5/NOPB supports up to 20 mA of continuous output current while maintaining regulation within specified accuracy limits. At 10 mA load, dropout voltage is 175–400 mV; output voltage deviation remains ≤±120 ppm/mA under full load. Exceeding 20 mA triggers internal current limiting, protecting the device but degrading reference accuracy.
How does the enable pin (EN) function on LM4128BQ1MFX2.5/NOPB?
The EN pin on LM4128BQ1MFX2.5/NOPB is an active-high digital control input with VIH ≥65% VIN and VIL ≤35% VIN. When pulled high (≥2.9 V at VIN = 4.5 V), the device operates normally; when pulled low or grounded, it enters shutdown mode drawing only 3–7 µA. An internal ~2 µA pull-up allows direct connection to VIN if always-on operation is acceptable.
Is LM4128BQ1MFX2.5/NOPB stable without an output capacitor?
Yes, LM4128BQ1MFX2.5/NOPB is explicitly designed to be stable with zero output capacitance (COUT = 0). It remains stable driving capacitive loads from 0 to 10 µF, including ceramic, tantalum, and electrolytic types. While COUT is optional, adding 1–10 µF improves load transient response - particularly beneficial in multiplexed ADC systems switching between reference-heavy channels.
LM4128BQ1MFX2.5/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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 275µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.9V ~ 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
LM4128BQ1MFX2.5/NOPB FAQ
1.How can I place an order for LM4128BQ1MFX2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BQ1MFX2.5/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 LM4128BQ1MFX2.5/NOPB reliable?
The price and inventory of LM4128BQ1MFX2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BQ1MFX2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BQ1MFX2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BQ1MFX2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BQ1MFX2.5/NOPB?
LM4128BQ1MFX2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BQ1MFX2.5/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 LM4128BQ1MFX2.5/NOPB?
For technical support, including LM4128BQ1MFX2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BQ1MFX2.5/NOPB requirements.
6.How does Aetrix verify that LM4128BQ1MFX2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BQ1MFX2.5/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 LM4128BQ1MFX2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BQ1MFX2.5/NOPB?
All LM4128BQ1MFX2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BQ1MFX2.5/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 LM4128BQ1MFX2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128BQ1MFX2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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