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Texas Instruments LM4128AQ1MF2.5/NOPB
- Part No.:
- LM4128AQ1MF2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AQ1MF2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,704
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Product details
Overview
LM4128AQ1MF2.5/NOPB from Texas Instruments is an AEC-Q100 Grade 1 qualified, precision micropower series voltage reference in a 5-pin SOT-23 package, delivering 2.5 V output with ±0.1% initial accuracy, 75 ppm/°C max temperature coefficient, and 60 µA supply current. It enables stable 2.5 V biasing for high-resolution ADCs in automotive sensor modules.
For engineers reviewing the LM4128AQ1MF2.5/NOPB datasheet, LM4128AQ1MF2.5/NOPB pinout, LM4128AQ1MF2.5/NOPB application, or LM4128AQ1MF2.5/NOPB equivalent, this page provides verified electrical specs, automotive-grade thermal performance (−40°C to +125°C), enable-controlled shutdown (3 µA), and dropout behavior (175–400 mV) critical for battery-supplied ADAS subsystems.
Technical Context
The LM4128AQ1MF2.5/NOPB uses a band-gap-derived reference core with internal enable logic and low-dropout series architecture. Its design eliminates need for external stabilization capacitors while maintaining stability with up to 10 µF capacitive loads - enabling compact layout in space-constrained automotive ECUs.
It operates across VIN = VREF + 400 mV to 5.5 V at load currents up to 20 mA, with guaranteed line regulation (50 ppm/V) and load regulation (25–120 ppm/mA) over full temperature range. Thermal hysteresis is limited to 75 ppm, supporting repeatable calibration in cyclic thermal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.1% initial accuracy (Grade A) - ensures ≤2.5 mV absolute error at 25°C for 12-bit+ system calibration. |
| Tempco | 75 ppm/°C max - limits drift to ±9.4 mV over −40°C to +125°C, suitable for engine bay temperature sensing. |
| Supply Current | 60 µA typical - enables >1-year battery life in always-on vehicle telematics nodes drawing <10 µA average. |
| Shutdown Current | 3–7 µA with EN = 0 V - allows deep-sleep mode in CAN wake-up circuits without reference leakage. |
| Dropout Voltage | 175–400 mV at 10 mA - supports operation down to 2.675 V input, compatible with single-cell LiFePO₄ or degraded 12 V rail. |
| Noise (0.1–10 Hz) | 275 µVPP - meets SNR requirements for 16-bit SAR ADCs in automotive current sensing. |
| Junction Temp Range | −40°C to +125°C - qualified per AEC-Q100 Grade 1, validated for under-hood ECU deployment. |
Pinout & Package
LM4128AQ1MF2.5/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package with 1.27 mm pitch, optimized for reflow assembly and thermal reliability in automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect | Must remain unconnected and floating; no internal connection - avoids unintended parasitic paths. |
| 2 (GND) | Analog ground reference | Low-impedance return path for reference core; requires dedicated ground plane tie to minimize noise coupling. |
| 3 (EN) | Enable control input | Active-high logic: VIH ≥65% VIN, VIL ≤35% VIN - interfaces directly with 3.3 V or 5 V microcontroller GPIO. |
| 4 (VIN) | Input supply | Accepts 2.9 V to 5.5 V; must exceed VREF by ≥400 mV - enables use with post-regulated 3.3 V domains. |
| 5 (VREF) | Precision output | 2.5 V buffered reference source; drives up to 20 mA; stable with 0–10 µF ceramic COUT - simplifies ADC reference buffering. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive applications requiring −40°C to +125°C operation and robustness against thermal cycling and vibration. |
| Enable pin with 3 µA shutdown | Reduces system standby power by >95% vs active mode - essential for ISO 16750-compliant sleep current budgets. |
| No external capacitor required | Stable with zero COUT; eliminates BOM cost and board area for decoupling - accelerates layout in tight ECU modules. |
| Indefinite short-circuit protection | Current-limited to 75 mA during output fault - prevents thermal runaway and preserves downstream ADC integrity. |
| Low 0.1–10 Hz noise (275 µVPP) | Enables <1 LSB error in 16-bit systems sampling at ≤10 kSPS - critical for high-fidelity battery cell monitoring. |
Applications
| Automotive Sensor Signal Conditioning | Industrial PLC Analog Input Modules |
|---|---|
Use Scenario: Front radar module conditioning thermistor and pressure transducer signals before digitization. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for 16-bit delta-sigma ADCs measuring temperature and barometric pressure. Use Value: 75 ppm/°C tempco and −40°C to +125°C operation ensure <±0.5% measurement error across full vehicle operating envelope. |
Use Scenario: DIN-rail mounted programmable logic controller acquiring 4–20 mA loop signals via precision resistive shunt. IC Role / Device Role / Timing Role: Supplies ratiometric reference to 24-bit sigma-delta ADC, enabling 0.01% full-scale accuracy. Use Value: 60 µA quiescent current and 20 mA drive capability allow direct shunt biasing without op-amp buffer, reducing component count. |
| Portable Medical Vital Signs Monitor | Battery Management System Reference |
Use Scenario: Handheld ECG device measuring microvolt-level cardiac signals using low-noise instrumentation amplifiers. IC Role / Device Role / Timing Role: Delivers ultra-low-noise 2.5 V reference to ADC front-end, minimizing quantization uncertainty. Use Value: 275 µVPP (0.1–10 Hz) noise floor supports detection of <10 µV QRS complexes without averaging artifacts. |
Use Scenario: EV battery pack monitor IC measuring individual cell voltages with 1 mV resolution over 0–5 V range. IC Role / Device Role / Timing Role: Serves as precision reference for 12-bit SAR ADCs in distributed cell voltage acquisition units. Use Value: ±0.1% initial accuracy and 50 ppm long-term stability (1000 hrs) maintain calibration validity between service intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AASA25+ | 2.5 V, ±0.02% initial accuracy, 3 ppm/°C tempco, 0.9 µA IQ - higher precision but 5× cost and no enable pin. | Used in lab-grade test equipment where 0.02% accuracy justifies cost; not automotive-qualified. | Select when sub-10 ppm total error budget is mandatory and AEC-Q100 is not required. |
| ADR3425ARJZ-R7 | 2.5 V, ±0.1% initial accuracy, 10 ppm/°C tempco, 120 µA IQ, no enable - superior tempco but higher supply current. | Favored in industrial data loggers needing ultra-low drift but tolerating higher power draw. | Choose if thermal stability dominates over quiescent current in fixed-power applications. |
Compared with MAX6126AASA25+ and ADR3425ARJZ-R7, LM4128AQ1MF2.5/NOPB uniquely balances AEC-Q100 qualification, enable-controlled ultra-low shutdown current (3 µA), and SOT-23 footprint - making it optimal for cost-sensitive, space-constrained automotive electronics where 0.1% accuracy suffices.
Availability
LM4128AQ1MF2.5/NOPB is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC analog inputs, portable medical monitors, and battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128AQ1MF2.5/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 specializing in analog and embedded processing technologies, with decades of expertise in precision analog ICs and automotive-grade reliability.
LM4128AQ1MF2.5/NOPB belongs to TI's precision voltage reference product line, engineered specifically for automotive and industrial applications demanding high accuracy, low power, and extended temperature operation without external compensation.
FAQ
What is the maximum load current supported by LM4128AQ1MF2.5/NOPB?
The LM4128AQ1MF2.5/NOPB supports up to 20 mA output current while maintaining specified accuracy and regulation. This enables direct driving of ADC reference inputs, op-amp bias networks, or small DACs without external buffers - verified across −40°C to +125°C junction temperature range per AEC-Q100 Grade 1 testing.
Does LM4128AQ1MF2.5/NOPB require an external input capacitor?
Yes - a minimum 0.1 µF ceramic capacitor (X5R/X7R) is required on the VIN pin (CIN) for stable operation. The LM4128AQ1MF2.5/NOPB datasheet specifies CIN ≥ COUT, and CIN must be placed close to the device. Larger values (4.7–22 µF) further reduce startup overshoot and supply noise coupling into the 2.5 V reference output.
What is the enable pin behavior of LM4128AQ1MF2.5/NOPB?
The EN pin of LM4128AQ1MF2.5/NOPB is active-high with VIH ≥65% VIN and VIL ≤35% VIN. When pulled low, it reduces supply current to 3–7 µA. The internal pull-up (~2 µA) allows direct connection to VIN for always-on operation. EN must never exceed VIN to avoid malfunction - confirmed in Electrical Characteristics tables and Application Information section.
Is LM4128AQ1MF2.5/NOPB qualified for automotive use?
Yes - LM4128AQ1MF2.5/NOPB is explicitly AEC-Q100 Grade 1 qualified (−40°C to +125°C), manufactured on an automotive-grade flow, and marked "LM4128AQ" in TI's packaging addendum. Its qualification covers thermal cycling, humidity, and mechanical stress tests required for under-hood and cabin ECU deployment.
How does LM4128AQ1MF2.5/NOPB handle short-circuit conditions?
LM4128AQ1MF2.5/NOPB features indefinite short-circuit protection, limiting output current to 75 mA when VREF is shorted to GND. This prevents thermal damage and maintains safe junction temperature during fault conditions - verified in Absolute Maximum Ratings and Typical Performance Characteristics (Figure 14).
LM4128AQ1MF2.5/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:
- ±0.1%
- 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
LM4128AQ1MF2.5/NOPB FAQ
1.How can I place an order for LM4128AQ1MF2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AQ1MF2.5/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 LM4128AQ1MF2.5/NOPB reliable?
The price and inventory of LM4128AQ1MF2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128AQ1MF2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AQ1MF2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AQ1MF2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AQ1MF2.5/NOPB?
LM4128AQ1MF2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AQ1MF2.5/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 LM4128AQ1MF2.5/NOPB?
For technical support, including LM4128AQ1MF2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AQ1MF2.5/NOPB requirements.
6.How does Aetrix verify that LM4128AQ1MF2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AQ1MF2.5/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 LM4128AQ1MF2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AQ1MF2.5/NOPB?
All LM4128AQ1MF2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AQ1MF2.5/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 LM4128AQ1MF2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128AQ1MF2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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