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Texas Instruments LM4128AMFX-3.3/NOPB
- Part No.:
- LM4128AMFX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMFX-3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,689
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Product details
Overview
LM4128AMFX-3.3/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 3.3 V output with ±0.1% initial accuracy (A-grade), 75 ppm/°C max 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 portable data acquisition systems.
For engineers reviewing the LM4128AMFX-3.3/NOPB datasheet, LM4128AMFX-3.3/NOPB pinout, LM4128AMFX-3.3/NOPB application, or LM4128AMFX-3.3/NOPB equivalent, key selection criteria include its low dropout (400 mV at 10 mA), stability with capacitive loads up to 10 µF, absence of required external stabilization capacitor, and guaranteed performance across automotive-grade temperature range.
Technical Context
The LM4128AMFX-3.3/NOPB uses an internal band-gap-derived reference architecture optimized for micropower operation and minimal external components. Its enable-controlled biasing allows seamless transition between active (60 µA) and shutdown (3–7 µA) states without output disturbance.
It achieves stable regulation with input voltages as low as VREF + 400 mV (i.e., ≥3.7 V), supports line regulation ≤85 ppm/V and load regulation ≤120 ppm/mA, and maintains output noise of 310 µVPP (0.1–10 Hz) - critical for high-resolution ADC biasing and precision analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.1% initial accuracy (A-grade) - ensures <±3.3 mV absolute error at 25°C for 12-bit+ system calibration. |
| Tempco | 75 ppm/°C max (−40°C to +125°C) - contributes ≤±0.027 V drift over full range, enabling stable reference in industrial environments. |
| Supply Current | 60 µA typical active, 3–7 µA in shutdown - extends battery life in always-on sensor nodes and portable meters. |
| Dropout Voltage | 400 mV max at 10 mA load - permits operation from single-cell Li-ion (3.7 V min) or regulated 3.7 V rails without headroom penalty. |
| Load Drive | 20 mA max output - sufficient to drive ADC reference inputs, op-amp bias networks, and small DACs directly. |
| Noise (0.1–10 Hz) | 310 µVPP - low enough to avoid degrading ENOB in 16-bit SAR ADCs when used as reference source. |
| Stability | Stable with 0–10 µF capacitive loads; no external compensation required - simplifies layout and reduces BOM count. |
Pinout & Package
LM4128AMFX-3.3/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package with 1.27 mm pitch, footprint compatible with JEDEC MO-178AA. The package supports reflow per Level-1-260°C specifications and is rated for −40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected and floating; not internally bonded - PCB pad may be omitted or left unconnected. |
| 2 (GND) | Analog ground reference | Primary return path for reference current; requires low-impedance connection to clean analog ground plane. |
| 3 (EN) | Active-high enable control | Drives internal bias circuitry; VIH ≥65% VIN, VIL ≤35% VIN - compatible with 1.8 V, 3.3 V, and 5 V logic interfaces. |
| 4 (VIN) | Input supply rail | Accepts 3.7 V to 5.5 V (VREF + 400 mV min); must be bypassed with ≥0.1 µF ceramic capacitor (CIN). |
| 5 (VREF) | Precision reference output | 3.3 V regulated output; capable of sourcing up to 20 mA; optional COUT improves transient response but not required. |
Key Features
| Feature | Design Value |
|---|---|
| 0.1% Initial Accuracy (A-grade) | Guaranteed at 25°C - eliminates need for post-assembly trimming in factory-calibrated test equipment and medical sensors. |
| 75 ppm/°C Max Tempco | Ensured over −40°C to +125°C - enables use in under-hood automotive modules and industrial PLC I/O without derating. |
| 60 µA Supply Current | Enables >1-year battery life in coin-cell-powered IoT edge nodes operating at 100 µA average system current. |
| 3 µA Shutdown Mode | Reduces quiescent draw by >95% - supports ultra-low-power wake-on-event architectures in portable instrumentation. |
| Stable with 10 µF Load Capacitance | Eliminates need for external compensation network - reduces design risk and layout sensitivity in space-constrained PCBs. |
| Indefinite Short-Circuit Protection | Limits output current to 75 mA - prevents device failure during board-level ESD events or accidental probe shorts. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring node measuring temperature, humidity, and pressure with 16-bit ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC and signal-conditioning amplifiers. Use Value: 310 µVPP low-frequency noise and 75 ppm/°C tempco preserve measurement integrity across −25°C to +70°C field operating range. |
Use Scenario: 4–20 mA loop-powered transmitter in hazardous-area process control cabinets. IC Role / Device Role / Timing Role: Stable excitation and reference source for bridge sensor conditioning and DAC output scaling. Use Value: 60 µA supply current minimizes loop power consumption; 400 mV dropout enables operation from 3.7 V loop-supply headroom. |
| Automotive Cabin Sensors | Medical Patient Monitoring |
|
Use Scenario: Occupant detection and air quality sensing module inside vehicle cabin (AEC-Q100 Grade 1 qualified variant available). IC Role / Device Role / Timing Role: Precision reference for analog front-end of gas concentration and CO₂ sensors. Use Value: −40°C to +125°C operation and 0.1% accuracy ensure compliance with automotive qualification requirements without derating. |
Use Scenario: Portable ECG and pulse oximeter with integrated analog signal chain and battery management. IC Role / Device Role / Timing Role: Reference for 12–16-bit medical-grade ADCs and programmable gain amplifier stages. Use Value: Low 310 µVPP noise avoids baseline wander artifacts; shutdown mode extends single-charge runtime beyond 8 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3033AIDBZR | 3.3 V, ±0.2% initial accuracy, 100 ppm/°C, 50 µA IQ, SOT-23-5 - lower quiescent current but looser accuracy and higher tempco. | Suitable for cost-sensitive consumer electronics where 0.2% tolerance is acceptable; not recommended for metrology-grade calibration. | Select REF3033AIDBZR only if system-level accuracy budget allows ±0.2% error and thermal drift up to 100 ppm/°C. |
| MAX6126AASA33+ | 3.3 V, ±0.06% initial accuracy, 5 ppm/°C, 120 µA IQ, SO-8 - superior accuracy/tempco but larger package and higher supply current. | Preferred for lab-grade instrumentation requiring sub-10 ppm total error; unsuitable for space-constrained portable designs. | Choose MAX6126AASA33+ only when long-term stability (<15 ppm/1000 hrs) and ultra-low tempco are mandatory, and SO-8 footprint is acceptable. |
Compared with REF3033AIDBZR and MAX6126AASA33+, LM4128AMFX-3.3/NOPB delivers optimal balance of A-grade 0.1% accuracy, 75 ppm/°C tempco, and 60 µA supply current in the smallest possible SOT-23 footprint - making it the preferred choice for space- and power-constrained industrial and portable precision analog systems.
Availability
LM4128AMFX-3.3/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and automotive cabin monitoring systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4128AMFX-3.3/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 specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision analog ICs and industrial-grade reliability.
LM4128AMFX-3.3/NOPB belongs to TI's precision micropower voltage reference product line, engineered specifically for space-constrained, battery-operated, and wide-temperature industrial applications demanding high initial accuracy and low drift.
FAQ
What is the maximum input voltage for LM4128AMFX-3.3/NOPB?
The absolute maximum input voltage for LM4128AMFX-3.3/NOPB is 6 V, but the recommended operating maximum is 5.5 V per the Electrical Characteristics table. Exceeding 5.5 V risks violating the Absolute Maximum Ratings and may cause permanent damage or parametric shift. Always maintain VIN ≤5.5 V in normal operation to ensure reliability and specification compliance for LM4128AMFX-3.3/NOPB.
Does LM4128AMFX-3.3/NOPB require an external output capacitor?
No, LM4128AMFX-3.3/NOPB is designed to operate stably without an external output capacitor (COUT). The datasheet explicitly states that COUT is optional and only improves load transient response. Stability is guaranteed from 0 to 10 µF capacitive load, so LM4128AMFX-3.3/NOPB can be used bare - reducing BOM count and PCB area - while maintaining regulation integrity.
What is the minimum input voltage required for LM4128AMFX-3.3/NOPB to regulate properly?
LM4128AMFX-3.3/NOPB requires a minimum input voltage of VREF + 400 mV = 3.7 V at 10 mA load to maintain regulation within 0.5% of nominal output. At lighter loads, dropout decreases - e.g., 175 mV typical at 10 mA for 3.3 V version - but 3.7 V is the guaranteed minimum for full-load operation. Below this, LM4128AMFX-3.3/NOPB enters dropout and output voltage drops linearly with VIN.
Is LM4128AMFX-3.3/NOPB qualified for automotive applications?
The LM4128AMFX-3.3/NOPB itself is not AEC-Q100 qualified; however, the pin-compatible LM4128AQMF-3.3/NOPB (Q-grade) is AEC-Q100 Grade 1 qualified and manufactured on an automotive-grade flow. For automotive cabin or infotainment applications requiring qualification, LM4128AQMF-3.3/NOPB must be selected instead of LM4128AMFX-3.3/NOPB to meet automotive reliability and testing standards.
How does the enable pin (EN) function on LM4128AMFX-3.3/NOPB?
The EN pin on LM4128AMFX-3.3/NOPB is an active-high digital control input. When pulled ≥65% of VIN (e.g., ≥2.4 V with 3.7 V supply), the device operates normally; when held ≤35% of VIN (e.g., ≤1.3 V), it enters 3–7 µA shutdown mode. The internal pull-up (~2 µA) allows EN to be tied directly to VIN for always-on operation, or driven by microcontroller GPIO for dynamic power gating - a key feature of LM4128AMFX-3.3/NOPB.
LM4128AMFX-3.3/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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128AMFX-3.3/NOPB FAQ
1.How can I place an order for LM4128AMFX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMFX-3.3/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 LM4128AMFX-3.3/NOPB reliable?
The price and inventory of LM4128AMFX-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128AMFX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AMFX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMFX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMFX-3.3/NOPB?
LM4128AMFX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMFX-3.3/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 LM4128AMFX-3.3/NOPB?
For technical support, including LM4128AMFX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMFX-3.3/NOPB requirements.
6.How does Aetrix verify that LM4128AMFX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AMFX-3.3/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 LM4128AMFX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AMFX-3.3/NOPB?
All LM4128AMFX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMFX-3.3/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 LM4128AMFX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128AMFX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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