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Texas Instruments LM4128AQ1MF3.3/NOPB
- Part No.:
- LM4128AQ1MF3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AQ1MF3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:805
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Product details
Overview
LM4128AQ1MF3.3/NOPB from Texas Instruments is an AEC-Q100 Grade 1 qualified, precision micropower series voltage reference in a 5-pin SOT-23 package, delivering 3.3 V output with ±0.1% initial accuracy, 75 ppm/°C max temperature coefficient, and 60 µA supply current. It enables low-power, high-stability analog signal conditioning in automotive sensor interfaces and battery-powered data acquisition systems.
For engineers reviewing the LM4128AQ1MF3.3/NOPB datasheet, LM4128AQ1MF3.3/NOPB pinout, LM4128AQ1MF3.3/NOPB application, or LM4128AQ1MF3.3/NOPB equivalent, key selection criteria include its automotive-grade qualification, enable-controlled 3 µA shutdown mode, 175–400 mV dropout at 10 mA, stability with up to 10 µF capacitive loads, and compatibility with low-ESR ceramic bypass capacitors.
Technical Context
The LM4128AQ1MF3.3/NOPB employs 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 across load currents from 0 to 20 mA and output capacitance up to 10 µF.
It operates over −40°C to +125°C junction temperature, supports input voltages from (VREF + 400 mV) to 5.5 V, and features built-in indefinite short-circuit protection limiting output current to 75 mA. The enable pin accepts logic-level inputs referenced to VIN, with 35% V and 65% V thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.1% initial accuracy (Grade A) - ensures ≤±3.3 mV absolute error at 25°C for high-resolution ADC/DAC biasing |
| Tempco | 75 ppm/°C max - limits drift to ≤±31.7 µV/°C over −40°C to +125°C, critical for automotive temperature cycling |
| Supply Current | 60 µA typical - enables multi-year operation from coin cells in portable instrumentation |
| Shutdown Current | 3–7 µA with EN = 0 V - allows deep power gating in duty-cycled sensor nodes |
| Dropout Voltage | 175–400 mV at 10 mA - supports regulation from 3.475 V input, compatible with single-cell LiFePO₄ or regulated 3.6 V rails |
| Output Noise | 310 µVPP (0.1–10 Hz) - suitable for 16-bit+ SAR ADC references without additional filtering |
| Load Capability | 20 mA max - drives multiple op-amp bias networks or ADC reference inputs simultaneously |
Pinout & Package
LM4128AQ1MF3.3/NOPB uses a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, 2.9 mm × 1.6 mm footprint, and exposed pad not connected internally. Pin 1 is N/C (no connect); pins must be routed per TI DBV mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected and floating; no PCB trace or thermal pad connection |
| 2 (GND) | Analog ground reference | Primary return path for reference current; requires low-impedance connection to clean analog ground plane |
| 3 (EN) | Enable control input | Active-high logic input; pulls up internally (~2 µA); ties to VIN for always-on operation |
| 4 (VIN) | Input supply rail | Accepts 3.7–5.5 V; minimum headroom = VREF + 400 mV for full-load regulation |
| 5 (VREF) | Precision output terminal | Delivers stable 3.3 V; requires ≥0.1 µF input capacitor (CIN ≥ COUT if COUT used) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive applications operating from −40°C to +125°C junction temperature |
| Capacitor-free stability | Stable with no output capacitor; supports optional COUT up to 10 µF for improved transient response |
| Low-noise band-gap core | 310 µVPP (0.1–10 Hz) enables direct use in 16-bit precision measurement front-ends |
| Indefinite short-circuit protection | Self-limits output to 75 mA during fault, preventing damage during board-level testing or ESD events |
| Thermal hysteresis | 75 ppm max - minimizes calibration drift after thermal cycling in engine control or ADAS modules |
Applications
| Automotive Sensor Signal Conditioning | Portable Data Acquisition |
|---|---|
Use Scenario: Providing stable excitation and reference for MEMS pressure sensors and RTD bridges in engine control units. IC Role / Device Role / Timing Role: Precision voltage reference supplying bias and ADC reference for analog front-end circuits. Use Value: ±0.1% initial accuracy and 75 ppm/°C tempco ensure <±0.5% total system gain error over full automotive temperature range. |
Use Scenario: Powering handheld multimeters and portable oscilloscope reference paths with single-cell batteries. IC Role / Device Role / Timing Role: Micropower series reference enabling >100-hour runtime on CR2032 cells. Use Value: 60 µA quiescent current and 3 µA shutdown mode extend battery life while maintaining 3.3 V reference integrity. |
| Industrial Process Monitoring | Medical Instrumentation |
Use Scenario: Calibrating 4–20 mA loop transmitters and isolated analog outputs in PLC I/O modules. IC Role / Device Role / Timing Role: Primary reference source for DACs and precision op-amps in current-output stages. Use Value: Load regulation of 25–120 ppm/mA ensures <±0.25 mV output shift across full 20 mA load range. |
Use Scenario: Supplying reference voltage for ECG/EEG analog front-ends requiring ultra-low noise and long-term stability. IC Role / Device Role / Timing Role: Low-noise, high-stability reference for 24-bit delta-sigma ADCs in diagnostic equipment. Use Value: 310 µVPP (0.1–10 Hz) noise and 50 ppm long-term drift over 1000 hours meet IEC 60601-2-27 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AUT33+T | 3.3 V, ±0.06% initial accuracy, 3 ppm/°C tempco, 0.9 µA supply current - higher precision but lower output drive (10 mA) | Better suited for ultra-low-power, high-accuracy applications like portable gas analyzers where load current ≤5 mA | Select MAX6126AUT33+T when sub-10 ppm/°C drift and <1 µA IQ are mandatory; avoid if >10 mA load or automotive qualification required |
| ADR3433ARJZ-R7 | 3.3 V, ±0.1% initial accuracy, 10 ppm/°C tempco, 120 µA supply current - superior tempco but higher IQ and no enable pin | Ideal for industrial control systems needing tighter thermal drift but tolerant of constant-on operation | Select ADR3433ARJZ-R7 when thermal stability dominates over power budget and enable functionality is unnecessary |
Compared with LM4128AQ1MF3.3/NOPB, MAX6126AUT33+T offers better accuracy and lower IQ but lacks automotive qualification and 20 mA drive; ADR3433ARJZ-R7 delivers 7× lower tempco but doubles supply current and omits shutdown control - making LM4128AQ1MF3.3/NOPB optimal for cost-sensitive, AEC-Q100-compliant designs requiring balanced performance.
Availability
LM4128AQ1MF3.3/NOPB is available at Aetrix Electronics and suitable for automotive electronics, portable instrumentation, and industrial process monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128AQ1MF3.3/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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
LM4128AQ1MF3.3/NOPB belongs to TI's precision voltage reference product line, engineered for high-accuracy, low-power, and automotive-qualified analog signal chains in harsh environments.
FAQ
What is the maximum input voltage for LM4128AQ1MF3.3/NOPB?
The LM4128AQ1MF3.3/NOPB supports a maximum input voltage of 5.5 V across its specified operating temperature range. Input voltage must remain ≥ (VREF + 400 mV) = 3.7 V to maintain regulation at full 20 mA load. Exceeding 5.5 V risks permanent damage per Absolute Maximum Ratings.
Does LM4128AQ1MF3.3/NOPB require an input capacitor?
Yes, LM4128AQ1MF3.3/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) placed close to the VIN pin. If an output capacitor (COUT) is used, CIN must be ≥ COUT. This ensures stability, reduces power-supply noise coupling, and improves startup overshoot behavior - omission risks oscillation or degraded noise performance.
What is the function of Pin 1 (N/C) on LM4128AQ1MF3.3/NOPB?
Pin 1 of LM4128AQ1MF3.3/NOPB is a no-connect (N/C) terminal with no internal connection. It must remain unconnected - neither tied to ground, VIN, nor left floating on a PCB trace. Routing to any net or applying solder paste may cause mechanical stress or parasitic coupling that degrades reference accuracy.
How does the enable pin (EN) operate on LM4128AQ1MF3.3/NOPB?
The EN pin on LM4128AQ1MF3.3/NOPB is an active-high logic input with internal ~2 µA pull-up. It asserts output when voltage exceeds 65% of VIN and disables output when below 35% of VIN. Driving EN directly from a microcontroller GPIO (3.3 V or 5 V) is valid; leaving it open connects it to VIN via internal pull-up for always-on operation.
Is LM4128AQ1MF3.3/NOPB suitable for driving 16-bit ADC references?
Yes, LM4128AQ1MF3.3/NOPB is suitable for driving 16-bit ADC references: its 310 µVPP (0.1–10 Hz) output noise contributes <0.5 LSB error in a 3.3 V full-scale 16-bit system (LSB = 50.5 µV), and its ±0.1% initial accuracy and 75 ppm/°C tempco ensure total error remains within ±1 LSB over temperature - provided layout follows TI's low-noise grounding recommendations.
LM4128AQ1MF3.3/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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 310µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3.7V ~ 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
LM4128AQ1MF3.3/NOPB FAQ
1.How can I place an order for LM4128AQ1MF3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AQ1MF3.3/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 LM4128AQ1MF3.3/NOPB reliable?
The price and inventory of LM4128AQ1MF3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128AQ1MF3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AQ1MF3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AQ1MF3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AQ1MF3.3/NOPB?
LM4128AQ1MF3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AQ1MF3.3/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 LM4128AQ1MF3.3/NOPB?
For technical support, including LM4128AQ1MF3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AQ1MF3.3/NOPB requirements.
6.How does Aetrix verify that LM4128AQ1MF3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AQ1MF3.3/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 LM4128AQ1MF3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AQ1MF3.3/NOPB?
All LM4128AQ1MF3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AQ1MF3.3/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 LM4128AQ1MF3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128AQ1MF3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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