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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Texas Instruments LM4128CQ1MF3.0/NOPB

Name: LM4128CQ1MF3.0/NOPB
Brand: Texas Instruments
SKU: LM4128CQ1MF3.0/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4128CQ1MF3.0/NOPB

Manufacturer:: Texas Instruments

Category:: Voltage Reference

Package:: SC-74A, SOT-753

Datasheet:: LM4128CQ1MF3.0/NOPB.pdf

Description:: IC VREF SERIES 0.5% SOT23-5

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Product details

Overview

LM4128CQ1MF3.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 3.0 V output with ±0.5% initial accuracy, 100 ppm/°C 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 portable data acquisition systems.

For engineers reviewing the LM4128CQ1MF3.0/NOPB datasheet, LM4128CQ1MF3.0/NOPB pinout, LM4128CQ1MF3.0/NOPB application, or LM4128CQ1MF3.0/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, and two confirmed alternative parts for space-constrained, low-power precision reference designs.

Technical Context

The LM4128CQ1MF3.0/NOPB uses an internal band-gap–derived reference core with active error correction to achieve stable 3.0 V output across −40°C to +125°C. Its enable-controlled architecture allows seamless transition between 60 µA active operation and 3–7 µA shutdown state without external circuitry.

Designed as a series reference, it eliminates need for external stabilization capacitors while remaining stable with capacitive loads up to 10 µF. Dropout voltage is specified at 175–400 mV (at 10 mA), enabling operation from VIN ≥ 3.175 V under full load - critical for single-cell Li-ion or 3.3 V rail-supplied systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.0 V nominal, ±0.5% initial accuracy (C-grade) - ensures ≤±15 mV absolute error at 25°C for 12-bit ADC biasing.
Tempco	100 ppm/°C max - contributes ≤±300 µV drift over −40°C to +125°C, supporting industrial-grade sensor calibration.
Supply Current	60 µA typical - enables >1-year battery life in 10 µA average-current portable devices using coin cells.
Shutdown Current	3–7 µA with EN = 0 V - reduces standby power by >90% vs active mode, suitable for duty-cycled measurement nodes.
Load Current	Up to 20 mA - drives multiple op-amp references or SAR ADCs directly without buffering.
Noise (0.1–10 Hz)	285 µV_PP - meets <1 LSB noise requirement for 14-bit 3 V full-scale converters.
Dropout Voltage	175–400 mV at 10 mA - allows operation from 3.3 V rail with ≥130 mV headroom, compatible with LDO-fed systems.

Pinout & Package

LM4128CQ1MF3.0/NOPB is housed in a 5-pin SOT-23 (DBV) package - RoHS-compliant, moisture sensitivity level 1, 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; no internal connection - PCB pad may be omitted or left unmasked.
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: VIH ≥ 65% VIN, VIL ≤ 35% VIN; internal 2 µA pull-up allows direct tie-to-VIN for always-on operation.
4 - VIN	Input supply	Accepts 3.175 V to 5.5 V; must exceed VREF + 400 mV at full load - decoupling capacitor (≥0.1 µF) required.
5 - VREF	Precision reference output	3.0 V regulated output; stable with 0–10 µF capacitive loads; optional COUT improves transient response.

Key Features

Feature	Design Value
Enable pin with 3–7 µA shutdown	Reduces system quiescent power by >90% during idle periods - essential for wireless sensor nodes with 10 s–hour wake intervals.
No external stabilization capacitor needed	Eliminates BOM cost and layout area for stability compensation; simplifies design for ultra-compact PCBs like wearables.
Stable with up to 10 µF capacitive load	Enables direct driving of ADC reference inputs, DAC buffers, or op-amp bias networks without phase-margin risk.
Indefinite short-circuit protection	Limits output current to 75 mA during fault - prevents thermal runaway and preserves reference integrity during board test or ESD events.
Low 0.1–10 Hz noise (285 µV_PP)	Supports high-resolution DC measurements (e.g., strain gauge bridges, thermopile sensors) without added filtering.

Applications

Portable Data Loggers	Automotive Cabin Sensors
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and pressure every 5 minutes. IC Role / Device Role / Timing Role: Provides stable 3.0 V reference for 16-bit sigma-delta ADC measuring bridge-based sensors. Use Value: ±0.5% initial accuracy and 100 ppm/°C tempco ensure <0.1% total measurement error across automotive cabin temperature range (−40°C to +85°C).	Use Scenario: Occupancy detection module using IR and capacitive sensing in vehicle dashboard. IC Role / Device Role / Timing Role: Supplies precision bias voltage to analog front-end amplifiers and comparators. Use Value: 60 µA supply current extends coin-cell lifetime beyond 3 years; enable pin synchronizes power with MCU sleep/wake cycles.
Industrial Process Transmitters	Medical Point-of-Care Devices
Use Scenario: 4–20 mA loop-powered transmitter converting RTD readings to current output. IC Role / Device Role / Timing Role: References both excitation current source and ADC in isolated signal chain. Use Value: 20 mA output drive capability eliminates need for external buffer; dropout <400 mV enables use with low-headroom loop supply.	Use Scenario: Handheld blood glucose meter requiring clinical-grade accuracy and single-button operation. IC Role / Device Role / Timing Role: Sets full-scale voltage for electrochemical sensor ADC and calibrates biosensor offset. Use Value: 285 µV_PP low-frequency noise ensures <1 mg/dL resolution in glucose concentration calculation without oversampling.

Portable Data Loggers

Automotive Cabin Sensors

Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and pressure every 5 minutes.

IC Role / Device Role / Timing Role: Provides stable 3.0 V reference for 16-bit sigma-delta ADC measuring bridge-based sensors.

Use Value: ±0.5% initial accuracy and 100 ppm/°C tempco ensure <0.1% total measurement error across automotive cabin temperature range (−40°C to +85°C).

Use Scenario: Occupancy detection module using IR and capacitive sensing in vehicle dashboard.

IC Role / Device Role / Timing Role: Supplies precision bias voltage to analog front-end amplifiers and comparators.

Use Value: 60 µA supply current extends coin-cell lifetime beyond 3 years; enable pin synchronizes power with MCU sleep/wake cycles.

Industrial Process Transmitters

Medical Point-of-Care Devices

Use Scenario: 4–20 mA loop-powered transmitter converting RTD readings to current output.

IC Role / Device Role / Timing Role: References both excitation current source and ADC in isolated signal chain.

Use Value: 20 mA output drive capability eliminates need for external buffer; dropout <400 mV enables use with low-headroom loop supply.

Use Scenario: Handheld blood glucose meter requiring clinical-grade accuracy and single-button operation.

IC Role / Device Role / Timing Role: Sets full-scale voltage for electrochemical sensor ADC and calibrates biosensor offset.

Use Value: 285 µV_PP low-frequency noise ensures <1 mg/dL resolution in glucose concentration calculation without oversampling.

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
REF3030AIDBZR	3.0 V, ±0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-5 - tighter accuracy/tempco but no enable pin.	Best for always-on, higher-accuracy systems where shutdown is unnecessary (e.g., mains-powered medical analyzers).	Select when long-term stability (<20 ppm/1000 hrs) and lower tempco outweigh need for power gating.
MAX6029AEUR+T	3.0 V, ±0.2% initial accuracy, 75 ppm/°C, 35 µA IQ, SOT-23-5 - includes enable, but max load = 10 mA and dropout = 150 mV.	Suitable for ultra-low-power microcontroller reference rails where load current ≤10 mA and VIN ≥3.15 V.	Prefer when minimizing active current is critical and load requirements are lighter than LM4128CQ1MF3.0/NOPB's 20 mA capability.

Compared with REF3030AIDBZR and MAX6029AEUR+T, LM4128CQ1MF3.0/NOPB uniquely balances 20 mA drive, enable functionality, and C-grade cost-making it optimal for battery-operated industrial transmitters needing robust load handling without sacrificing shutdown efficiency.

Availability

LM4128CQ1MF3.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin electronics, and industrial process transmitters requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for LM4128CQ1MF3.0/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-qualified components.

LM4128CQ1MF3.0/NOPB belongs to TI's precision voltage reference product line, engineered for high-accuracy, low-power, and temperature-stable operation in space-constrained, battery-sensitive applications - especially where AEC-Q100 Grade 1 qualification is required.

FAQ

What is the operating temperature range for LM4128CQ1MF3.0/NOPB?

The LM4128CQ1MF3.0/NOPB is qualified for −40°C to +125°C junction temperature operation and is AEC-Q100 Grade 1 certified, making it suitable for under-hood automotive and industrial environments where thermal reliability is critical. This rating is validated per TI's production test flow and applies across all electrical specifications in the datasheet.

Does LM4128CQ1MF3.0/NOPB require an input capacitor?

Yes - LM4128CQ1MF3.0/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) connected between VIN and GND. If an output capacitor (COUT) is used, CIN must be ≥ COUT. This is mandatory for stability and noise suppression; omitting CIN risks oscillation or degraded transient response in the LM4128CQ1MF3.0/NOPB circuit.

What is the maximum load current supported by LM4128CQ1MF3.0/NOPB?

The LM4128CQ1MF3.0/NOPB delivers up to 20 mA of continuous output current while maintaining regulation within specification. At 10 mA load, dropout voltage is 175–400 mV; performance remains stable with capacitive loads up to 10 µF - enabling direct interface with ADCs, op-amps, and current sources without external buffering.

How does the enable pin function on LM4128CQ1MF3.0/NOPB?

The EN pin on LM4128CQ1MF3.0/NOPB is active-high with VIH ≥ 65% VIN and VIL ≤ 35% VIN. When pulled high (or tied to VIN), the device operates normally (60 µA IQ); when pulled low, it enters shutdown mode drawing only 3–7 µA. An internal 2 µA pull-up allows default-enable operation if EN is left unconnected.

Is LM4128CQ1MF3.0/NOPB pin-compatible with other LM4128 variants?

Yes - all LM4128xMF-x.x/NOPB variants, including LM4128CQ1MF3.0/NOPB, share identical 5-pin SOT-23 (DBV) packaging and pinout (N/C, GND, EN, VIN, VREF). Voltage option (3.0 V), grade (C), and qualification (Q1 automotive) are differentiated only by part marking and internal trimming - enabling drop-in replacement across same-voltage family members.

LM4128CQ1MF3.0/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):: 3V

Voltage - Output (Max):: -

Current - Output:: 20 mA

Tolerance:: ±0.5%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: 285µVp-p

Noise - 10Hz to 10kHz:: -

Voltage - Input:: 3.4V ~ 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

LM4128CQ1MF3.0/NOPB FAQ

1.How can I place an order for LM4128CQ1MF3.0/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4128CQ1MF3.0/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 LM4128CQ1MF3.0/NOPB reliable?

The price and inventory of LM4128CQ1MF3.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CQ1MF3.0/NOPB is usually 5 days.

3.What payment methods are accepted for LM4128CQ1MF3.0/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CQ1MF3.0/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4128CQ1MF3.0/NOPB?

LM4128CQ1MF3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4128CQ1MF3.0/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 LM4128CQ1MF3.0/NOPB?

For technical support, including LM4128CQ1MF3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CQ1MF3.0/NOPB requirements.

6.How does Aetrix verify that LM4128CQ1MF3.0/NOPB is sourced from the original manufacturer or authorized distributors?

All LM4128CQ1MF3.0/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 LM4128CQ1MF3.0/NOPB meets industry standards.

7.What is the process for return or replacement of LM4128CQ1MF3.0/NOPB?

All LM4128CQ1MF3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CQ1MF3.0/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 LM4128CQ1MF3.0/NOPB part is unused and in its original packaging.

Return procedure for LM4128CQ1MF3.0/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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