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Texas Instruments LM4128DQ1MFX2.5/NOPB
- Part No.:
- LM4128DQ1MFX2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DQ1MFX2.5/NOPB.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,446
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Product details
Overview
LM4128DQ1MFX2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 2.5 V output with ±1.0% initial accuracy, 100 ppm/°C max temperature coefficient, and 60 µA supply current. It features an enable pin for 3–7 µA shutdown mode, supports up to 20 mA load, and operates from −40°C to +125°C - ideal for battery-powered instrumentation and automotive sensor signal conditioning.
For engineers reviewing the LM4128DQ1MFX2.5/NOPB datasheet, LM4128DQ1MFX2.5/NOPB pinout, LM4128DQ1MFX2.5/NOPB application, or LM4128DQ1MFX2.5/NOPB equivalent, this page provides verified specifications, validated pin functions, confirmed automotive-grade thermal performance, and real-world use cases in precision analog front-ends and A/D reference circuits.
Technical Context
The LM4128DQ1MFX2.5/NOPB implements a band-gap-based series voltage reference architecture with internal enable control logic and dropout regulation down to 175 mV at 10 mA. Its design eliminates need for external stabilization capacitors while maintaining stability with capacitive loads up to 10 µF, including low-ESR ceramic types.
It operates across VIN = VREF + 400 mV to 5.5 V, delivers 2.5 V output with 275 µVPP (0.1–10 Hz) noise, and exhibits 50 ppm long-term stability over 1000 hours - all specified over −40°C to +125°C junction temperature range per AEC-Q100 Grade 1 qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±1.0% initial tolerance (D-grade), enabling 12-bit ADC reference accuracy without trimming |
| Tempco | ≤100 ppm/°C over −40°C to +125°C, limiting drift to ≤0.25 mV across full automotive temperature range |
| Supply Current | 60 µA typical, supporting >1-year battery life in 10 µA-sleep systems with periodic wake-up sampling |
| Shutdown Current | 3–7 µA when EN = 0 V, allowing deep power-down during idle intervals in portable data loggers |
| Dropout Voltage | 175–400 mV at 10 mA, permitting operation from single-cell Li-ion (3.0–4.2 V) or 3.3 V rails with margin |
| Noise (0.1–10 Hz) | 275 µVPP, suitable for 16-bit SAR ADCs requiring <1 LSB error at 2.5 V full-scale |
| Load Drive | Up to 20 mA output, sufficient to drive ADC reference inputs, op-amp bias networks, and DAC buffers |
Pinout & Package
LM4128DQ1MFX2.5/NOPB uses the 5-pin SOT-23 (DBV) package - RoHS-compliant, moisture-sensitive level 1, rated for −40°C to +125°C operation, with standard JEDEC outline and 260°C peak reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected and floating; no internal connection or function |
| 2 (GND) | Analog ground reference | Primary return path for reference output and internal band-gap circuitry; requires low-impedance PCB connection |
| 3 (EN) | Enable control input | Active-high logic input; VIH ≥65% VIN, VIL ≤35% VIN; drives device into 3–7 µA shutdown when low |
| 4 (VIN) | Input supply rail | Accepts 2.9 V to 5.5 V (≥VREF + 400 mV); must be bypassed with ≥0.1 µF ceramic capacitor |
| 5 (VREF) | Precision reference output | 2.5 V regulated output; stable with 0–10 µF capacitive loads; requires no external compensation |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 qualified (−40°C to +125°C), manufactured on automotive-grade flow for reliability-critical systems |
| Capacitor-free stability | Stable without output capacitor and with up to 10 µF load capacitance - simplifies layout and reduces BOM count |
| Low-noise output | 275 µVPP (0.1–10 Hz) enables high-resolution data acquisition without post-filtering |
| Indefinite short-circuit protection | Self-limits output to 75 mA during fault, preventing damage during board-level ESD or wiring errors |
| Low dropout operation | 175 mV dropout at 10 mA allows use with low-headroom supplies such as buck converter outputs or aging batteries |
Applications
| Portable Data Acquisition | Automotive Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered handheld multimeter acquiring 16-bit voltage readings every 100 ms. IC Role / Device Role / Timing Role: Primary 2.5 V reference for SAR ADC and analog front-end gain stages. Use Value: 100 ppm/°C tempco and 275 µVPP noise ensure <±0.5 LSB error across −10°C to +50°C operating range. | Use Scenario: Engine control unit measuring exhaust gas oxygen sensor output under wide thermal cycling. IC Role / Device Role / Timing Role: Stable reference for ratiometric measurement of lambda sensor bridge output. Use Value: AEC-Q100 Grade 1 rating and 50 ppm long-term stability maintain calibration integrity over 10+ years of vehicle service. |
| Industrial Process Transmitter | Medical Patient Monitor Analog Front-End |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in hazardous environments. IC Role / Device Role / Timing Role: Precision reference for DAC generating loop current and for sensor excitation. Use Value: 60 µA quiescent current and 20 mA drive capability support full functionality within 3.5 mA loop budget. | Use Scenario: Portable ECG module digitizing biopotential signals with 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Low-noise 2.5 V reference for ADC and programmable gain amplifier biasing. Use Value: 275 µVPP (0.1–10 Hz) noise contributes <0.1 µV RMS error - below physiological signal amplitude floor. |
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, 0.06% initial accuracy, 3 ppm/°C tempco, 1.2 mA supply current, SO-8 package | Higher precision and lower drift, but 20× higher quiescent current and larger footprint | Choose for metrology-grade accuracy where power and space permit |
| ADR3425ARJZ-R7 | 2.5 V, 0.1% initial accuracy, 10 ppm/°C tempco, 120 µA supply current, SOT-23-5 package | Better tempco and same grade accuracy, but higher supply current and no enable pin | Choose when ultra-low drift is critical and shutdown control is not required |
Compared with MAX6126AASA25+ and ADR3425ARJZ-R7, LM4128DQ1MFX2.5/NOPB offers unique combination of automotive qualification, enable-controlled shutdown, and micropower operation in SOT-23 - making it optimal for space-constrained, battery-aware, and safety-compliant embedded systems.
Availability
LM4128DQ1MFX2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, and industrial process transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128DQ1MFX2.5/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 reference design and automotive-grade manufacturing.
The LM4128 product line delivers micropower, high-accuracy series voltage references optimized for battery-operated and automotive applications where thermal stability, low noise, and enable-controlled power gating are essential.
FAQ
What is the maximum load current supported by LM4128DQ1MFX2.5/NOPB?
The LM4128DQ1MFX2.5/NOPB supports up to 20 mA output current while maintaining specified accuracy and stability. This enables direct driving of ADC reference inputs, op-amp bias networks, and moderate-current DAC buffers without external amplification. At 20 mA, dropout remains within 400 mV, preserving regulation across its full operating range.
Does LM4128DQ1MFX2.5/NOPB require an external output capacitor?
No, LM4128DQ1MFX2.5/NOPB is designed to operate stably without an external output capacitor and remains stable with capacitive loads up to 10 µF. An optional COUT improves load transient response but is not required for basic regulation - reducing BOM cost and PCB area versus traditional references needing mandatory output caps.
What is the purpose of the N/C pin on LM4128DQ1MFX2.5/NOPB?
Pin 1 of LM4128DQ1MFX2.5/NOPB is a no-connect (N/C) terminal with no internal connection. It must be left unconnected and floating - neither tied to ground nor routed on the PCB. This pin exists for mechanical symmetry in the SOT-23 package and has zero electrical function in the LM4128DQ1MFX2.5/NOPB device.
How does the enable pin (EN) function on LM4128DQ1MFX2.5/NOPB?
The EN pin (Pin 3) of LM4128DQ1MFX2.5/NOPB is an active-high digital control input. When pulled ≥65% of VIN, the device operates normally; when held ≤35% of VIN, it enters shutdown mode drawing only 3–7 µA. Internal pull-up (~2 µA) allows direct connection to VIN for always-on operation, or interface with microcontroller GPIO for dynamic power control.
Is LM4128DQ1MFX2.5/NOPB qualified for automotive applications?
Yes, LM4128DQ1MFX2.5/NOPB is LM4128DQ grade - AEC-Q100 Grade 1 qualified (−40°C to +125°C) and manufactured on an automotive-grade flow. Its datasheet specifies full parametric performance across this range, including tempco, long-term stability, and dropout, making it suitable for engine control, ADAS sensors, and body electronics where reliability is mandated.
LM4128DQ1MFX2.5/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:
- ±1%
- Temperature Coefficient:
- 100ppm/°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
LM4128DQ1MFX2.5/NOPB FAQ
1.How can I place an order for LM4128DQ1MFX2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DQ1MFX2.5/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 LM4128DQ1MFX2.5/NOPB reliable?
The price and inventory of LM4128DQ1MFX2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128DQ1MFX2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128DQ1MFX2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DQ1MFX2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DQ1MFX2.5/NOPB?
LM4128DQ1MFX2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DQ1MFX2.5/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 LM4128DQ1MFX2.5/NOPB?
For technical support, including LM4128DQ1MFX2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DQ1MFX2.5/NOPB requirements.
6.How does Aetrix verify that LM4128DQ1MFX2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128DQ1MFX2.5/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 LM4128DQ1MFX2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128DQ1MFX2.5/NOPB?
All LM4128DQ1MFX2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DQ1MFX2.5/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 LM4128DQ1MFX2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128DQ1MFX2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128DQ1MFX2.5/NOPB Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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