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Texas Instruments LM4128CQ1MFX3.3/NOPB
- Part No.:
- LM4128CQ1MFX3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CQ1MFX3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,596
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Product details
Overview
LM4128CQ1MFX3.3/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 3.3 V output with ±0.5% initial accuracy, 100 ppm/°C 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 LM4128CQ1MFX3.3/NOPB datasheet, LM4128CQ1MFX3.3/NOPB pinout, LM4128CQ1MFX3.3/NOPB application, or LM4128CQ1MFX3.3/NOPB equivalent, key selection criteria include its grade-C accuracy specification, dropout voltage of 175–400 mV at 10 mA, stability with capacitive loads up to 10 µF, and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The LM4128CQ1MFX3.3/NOPB implements a band-gap-based series voltage reference architecture with internal enable control logic and low-impedance output stage. Its design eliminates need for external stabilization capacitor while maintaining stability with COUT ≤10 µF and ensures monotonic turn-on behavior under varying load and temperature conditions.
It operates across VIN = VREF + 400 mV to 5.5 V, supports indefinite short-circuit protection (75 mA limit), and delivers 310 µVPP (0.1–10 Hz) output noise. The enable pin accepts logic-level inputs (VIH ≥65% VIN, VIL ≤35% VIN) and features internal 2 µA pull-up, allowing direct tie-to-VIN or microcontroller-driven control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.5% initial accuracy (Grade C) - ensures 16-bit ADC reference error ≤±32 LSB at 3.3 V full scale |
| Temperature Coefficient | 100 ppm/°C max over −40°C to +125°C - limits drift to ±132 µV/°C, critical for wide-temp industrial sensors |
| Supply Current | 60–100 µA active, 3–7 µA shutdown - enables >10-year battery life in 10 µA average-power IoT nodes |
| Dropout Voltage | 175–400 mV at 10 mA load - allows operation from single-cell Li-ion (3.0–4.2 V) or 3.3 V rail with margin |
| Load Regulation | 25–120 ppm/mA - maintains <±0.4 mV error across 0–20 mA load, suitable for driving DAC buffers and op-amp references |
| Output Noise | 310 µVPP (0.1–10 Hz) - meets <1 LSB noise requirement for 16-bit SAR ADCs with 3.3 V reference |
| Junction Temp Range | −40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood automotive applications |
Pinout & Package
LM4128CQ1MFX3.3/NOPB uses a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, 2.9 mm × 1.6 mm footprint, and 1.0 mm height. Pin 1 is N/C (no connect); pins are arranged top-view as: 1=N/C, 2=GND, 3=EN, 4=VIN, 5=VREF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must remain unconnected and floating - no routing or soldering; electrically isolated within die |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference output and internal bias; requires low-impedance PCB plane connection |
| Pin 3 (EN) | Enable control input | Active-high logic input; drives device into 3–7 µA shutdown when pulled low (<35% VIN) |
| Pin 4 (VIN) | Input supply rail | Accepts 3.7–5.5 V input; must exceed VREF by ≥400 mV for regulation; bypassed with ≥0.1 µF ceramic cap |
| Pin 5 (VREF) | Precision reference output | 3.3 V regulated output capable of sourcing up to 20 mA; stable with 0–10 µF capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Grade-C precision | ±0.5% initial accuracy and 100 ppm/°C tempco - balances cost and performance for mid-tier test equipment |
| Enable-controlled shutdown | Reduces quiescent current to 3–7 µA - enables duty-cycled sensing in portable medical devices |
| Capacitor-free stability | Stable with no output capacitor and up to 10 µF load - simplifies layout and reduces BOM count in space-constrained designs |
| AEC-Q100 Grade 1 | Qualified for automotive applications at −40°C to +125°C junction temperature - supports engine control and ADAS subsystems |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault - prevents thermal runaway and enables robust field-repairable systems |
Applications
| Portable Data Loggers | Automotive Sensor Signal Chains |
|---|---|
|
Use Scenario: Battery-powered environmental monitoring units sampling temperature, humidity, and pressure at 1 Hz with 16-bit ADC. IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADC and analog front-end op-amps. Use Value: 60 µA supply current extends coin-cell life beyond 5 years; ±0.5% accuracy ensures calibrated measurement traceability without field recalibration. |
Use Scenario: Engine coolant temperature and manifold absolute pressure (MAP) sensor signal conditioning in powertrain ECUs. IC Role / Device Role / Timing Role: Stable 3.3 V reference for ratiometric sensor excitation and ADC conversion. Use Value: AEC-Q100 Grade 1 rating and 100 ppm/°C tempco maintain <±0.25% system gain error across −40°C to +125°C ambient. |
| Industrial PLC Analog Input Modules | Medical Patient Monitoring Front-Ends |
|
Use Scenario: 4–20 mA loop-powered I/O modules converting field signals with 24-bit ΣΔ ADCs. IC Role / Device Role / Timing Role: Precision reference for ADC and programmable gain amplifier (PGA) calibration. Use Value: 310 µVPP low-frequency noise avoids degradation of effective resolution below 20 bits; 20 mA drive capability supports multiple PGA channels. |
Use Scenario: Portable ECG and pulse oximetry devices requiring low-noise, low-power analog signal acquisition. IC Role / Device Role / Timing Role: Reference source for instrumentation amplifiers and anti-aliasing filters. Use Value: Shutdown mode reduces system standby power by >95%; long-term stability of 50 ppm/1000 hrs ensures clinical-grade calibration validity. |
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 (Grade A), 50 ppm/°C, 50 µA IQ, SOT-23-5 | Higher accuracy and lower tempco, but not AEC-Q100 qualified | Select for lab-grade test equipment where automotive qualification is unnecessary |
| MAX6033AEUR+T | 3.3 V, ±0.5% initial accuracy, 75 ppm/°C, 35 µA IQ, SOT-23-5, no enable pin | Lacks enable function and automotive qualification; lower supply current | Select for cost-sensitive consumer electronics where shutdown control is not required |
Compared with LM4128CQ1MFX3.3/NOPB, REF3033AIDBZR offers tighter accuracy and tempco but lacks automotive qualification, while MAX6033AEUR+T saves quiescent current but removes enable functionality - making LM4128CQ1MFX3.3/NOPB the only option combining Grade-C precision, AEC-Q100 Grade 1, and active shutdown in SOT-23.
Availability
LM4128CQ1MFX3.3/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor interfaces, and industrial data acquisition systems requiring stable component supply with guaranteed long-term availability.
Supply support for LM4128CQ1MFX3.3/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 and embedded processing technologies, with decades of expertise in precision analog ICs and automotive-grade components.
The LM4128 product line delivers micropower, high-accuracy series voltage references for space-constrained, battery-operated, and automotive applications - designed to replace bulkier shunt references while minimizing power and board area.
FAQ
What is the maximum input voltage for LM4128CQ1MFX3.3/NOPB?
The LM4128CQ1MFX3.3/NOPB supports a maximum input voltage of 5.5 V. Operation above this level risks permanent damage. For reliable regulation, VIN must be ≥3.7 V (VREF + 400 mV) and ≤5.5 V across the full temperature range. Absolute maximum rating is 6 V, but sustained operation above 5.5 V is not recommended per TI's Electrical Characteristics table.
Does LM4128CQ1MFX3.3/NOPB require an external input capacitor?
Yes, LM4128CQ1MFX3.3/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) placed close to the VIN and GND pins. This capacitor is mandatory for stability and noise suppression. When an output capacitor (COUT) is used, CIN must be ≥ COUT. X5R or X7R dielectrics are recommended to ensure low ESR and stable operation across temperature.
What does the 'CQ' suffix indicate in LM4128CQ1MFX3.3/NOPB?
The 'CQ' in LM4128CQ1MFX3.3/NOPB denotes Grade C accuracy (±0.5% initial tolerance) and AEC-Q100 Grade 1 qualification. The 'Q' confirms automotive flow manufacturing and testing; 'C' specifies the accuracy grade per the LM4128 family datasheet. This distinguishes it from 'AQ' (0.1%), 'BQ' (0.2%), and 'DQ' (1.0%) variants.
Can LM4128CQ1MFX3.3/NOPB drive a 10 µF output capacitor?
Yes, LM4128CQ1MFX3.3/NOPB is explicitly characterized for stability with capacitive loads up to 10 µF. Adding COUT improves load transient response but increases turn-on time - e.g., 78.8 µs to 90% of 3.3 V with 10 µF vs. 33.2 µs with 1 µF. No series resistance or isolation is needed; low-ESR ceramic capacitors are recommended.
Is LM4128CQ1MFX3.3/NOPB compatible with lead-free reflow processes?
Yes, LM4128CQ1MFX3.3/NOPB is RoHS-compliant and rated for lead-free reflow with MSL Level-1 (260°C peak, unlimited floor life). Its SOT-23 (DBV) package uses Sn (matte tin) lead finish and is qualified per JEDEC J-STD-020. Standard IR reflow profiles with peak temperature ≤260°C and time above liquidus ≤60 seconds are fully supported.
LM4128CQ1MFX3.3/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:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°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
LM4128CQ1MFX3.3/NOPB FAQ
1.How can I place an order for LM4128CQ1MFX3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CQ1MFX3.3/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 LM4128CQ1MFX3.3/NOPB reliable?
The price and inventory of LM4128CQ1MFX3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CQ1MFX3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CQ1MFX3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CQ1MFX3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CQ1MFX3.3/NOPB?
LM4128CQ1MFX3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CQ1MFX3.3/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 LM4128CQ1MFX3.3/NOPB?
For technical support, including LM4128CQ1MFX3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CQ1MFX3.3/NOPB requirements.
6.How does Aetrix verify that LM4128CQ1MFX3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CQ1MFX3.3/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 LM4128CQ1MFX3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CQ1MFX3.3/NOPB?
All LM4128CQ1MFX3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CQ1MFX3.3/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 LM4128CQ1MFX3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128CQ1MFX3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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