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Texas Instruments LM4128CMFX-3.0/NOPB
- Part No.:
- LM4128CMFX-3.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMFX-3.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,958
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Product details
Overview
LM4128CMFX-3.0/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 (C grade), 100 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 LM4128CMFX-3.0/NOPB datasheet, LM4128CMFX-3.0/NOPB pinout, LM4128CMFX-3.0/NOPB application, or LM4128CMFX-3.0/NOPB equivalent, key selection criteria include its 3.0 V fixed output, low dropout (400 mV at 10 mA), stability with capacitive loads up to 10 µF, and absence of required external stabilization capacitor - enabling compact, low-power analog front-end designs.
Technical Context
The LM4128CMFX-3.0/NOPB uses a band-gap–derived reference architecture optimized for micropower operation and high DC accuracy. Its enable pin controls internal biasing via a 2 µA pull-up, allowing full shutdown without external circuitry. The device achieves stability without mandatory output capacitance while remaining robust with ceramic COUT up to 10 µF.
It operates as a series reference with VIN ≥ VREF + 400 mV (i.e., ≥3.4 V at 10 mA load), exhibits 25–120 ppm/mA load regulation, and maintains 70 ppm/V line regulation across its 3.4–5.5 V input range. Thermal hysteresis is limited to 75 ppm over −40°C to +125°C cycling.
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 reference scaling |
| Temperature Coefficient | 100 ppm/°C max - contributes ≤±300 µV/°C drift over operating range, critical for precision sensor signal chains |
| Supply Current | 60 µA typical - enables >1-year battery life in 10 µA-sleep IoT nodes when paired with low-power MCU |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces system standby power by >90% vs active mode |
| Dropout Voltage | 400 mV max at 10 mA - allows operation from single-cell Li-ion (3.4 V min) or 3.3 V rail with margin |
| Noise (0.1–10 Hz) | 285 µVPP - supports 16-bit resolution in low-frequency measurement applications without filtering |
| Load Current Capability | 20 mA max - drives multiple op-amp bias networks or SAR ADC reference inputs directly |
Pinout & Package
LM4128CMFX-3.0/NOPB is housed in a 5-pin SOT-23 (DBV) surface-mount package (2.9 mm × 1.6 mm × 1.15 mm), RoHS-compliant, with SN lead finish and MSL Level-1 rating.
| 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 input; VIH ≥65% VIN, VIL ≤35% VIN - compatible with 1.8 V, 3.3 V, and 5 V digital interfaces |
| 4 - VIN | Positive supply input | Accepts 3.4–5.5 V; must exceed VREF by ≥400 mV to maintain regulation under 10 mA load |
| 5 - VREF | Precision reference output | 3.0 V regulated output; stable with 0–10 µF capacitive loads; requires ≥0.1 µF ceramic CIN on VIN |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.0 V output | Eliminates external resistor network for DAC/ADC reference; avoids ratio-matching errors in ratiometric systems |
| Enable pin with 3 µA shutdown | Enables duty-cycled operation in portable meters - reference active only during conversion windows |
| No external stabilization capacitor required | Reduces BOM count and board area; simplifies layout for space-constrained wearables and handheld test tools |
| Stable with up to 10 µF capacitive loads | Supports fast load transient response in multi-channel data loggers without oscillation risk |
| −40°C to +125°C operating range | Validated for under-hood automotive sensors and industrial PLC I/O modules without derating |
Applications
| Portable Data Acquisition | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Handheld multimeter sampling analog inputs at 1 kSPS with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC and analog front-end gain stages. Use Value: 285 µVPP low-frequency noise and 100 ppm/°C tempco ensure <0.01% measurement accuracy across 0–40°C ambient. |
Use Scenario: Wireless environmental sensor node logging temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Reference source for precision RTD and humidity transducer signal conditioning. Use Value: 60 µA quiescent current and 3 µA shutdown extend CR2032 battery life beyond 2 years in sleep-active cycling. |
| Industrial Process Control | Automotive Sensor Interface |
|
Use Scenario: 4–20 mA transmitter module converting thermocouple signals in factory automation. IC Role / Device Role / Timing Role: Stable excitation and reference for cold-junction compensation and DAC output scaling. Use Value: ±0.5% initial accuracy and 75 ppm thermal hysteresis prevent calibration drift after thermal cycling in control cabinets. |
Use Scenario: Engine control unit (ECU) monitoring intake air temperature and pressure with analog sensors. IC Role / Device Role / Timing Role: High-reliability reference for sensor signal conditioning in AEC-Q100–compliant subsystems. Use Value: Qualified to −40°C to +125°C junction temperature and rated for automotive-grade flow - meets ASIL-B functional safety support 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 |
|---|---|---|---|
| REF3030AIDBZR | 3.0 V, ±0.2% initial accuracy (A grade), 50 ppm/°C max, 50 µA IQ, SOT-23-5 | Higher accuracy and lower tempco, but no enable pin - requires external FET for shutdown | Select for metrology-grade accuracy where enable functionality is not needed and layout allows discrete switch |
| MAX6033AEUR+T | 3.0 V, ±0.1% initial accuracy, 30 ppm/°C max, 75 µA IQ, SOT-23-5, no enable pin | Superior long-term stability (20 ppm/1k hrs) and lower noise (15 µVRMS, 0.1–10 Hz), but lacks shutdown capability | Prefer for high-stability medical sensor front-ends where continuous operation is acceptable and ultra-low drift is critical |
Compared with REF3030AIDBZR and MAX6033AEUR+T, the LM4128CMFX-3.0/NOPB uniquely integrates enable control with micropower operation and wide temperature range - making it optimal for cyclically powered industrial and automotive sensors where shutdown autonomy and ruggedness outweigh marginal accuracy gains.
Availability
LM4128CMFX-3.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and automotive sensor interface circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128CMFX-3.0/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 industrial-grade reliability.
The LM4128 family was designed specifically for space-constrained, low-power applications demanding high DC accuracy and robust thermal performance - targeting instrumentation, portable test equipment, and automotive sensor signal chains.
FAQ
What is the minimum input voltage required for stable operation of the LM4128CMFX-3.0/NOPB?
The LM4128CMFX-3.0/NOPB requires VIN ≥ VREF + 400 mV, i.e., ≥3.4 V, to maintain regulation at 10 mA load. At lighter loads, dropout decreases - e.g., 175 mV at 10 mA for 3.0 V version per datasheet. Operation below 3.4 V risks output collapse or increased line regulation error.
Does the LM4128CMFX-3.0/NOPB require an external output capacitor?
No - the LM4128CMFX-3.0/NOPB is internally compensated and stable without COUT. However, adding a 1–10 µF ceramic capacitor between VREF and GND improves load transient response. CIN ≥0.1 µF on VIN remains mandatory for stability.
What does the 'C' in LM4128CMFX-3.0/NOPB indicate?
The 'C' denotes the accuracy grade: LM4128C-3.0 guarantees ±0.5% initial output voltage tolerance at 25°C. Other grades include A (±0.1%), B (±0.2%), and D (±1.0%). All grades share identical pinout, package, and functional behavior.
Can the LM4128CMFX-3.0/NOPB drive a 20 mA load continuously?
Yes - the LM4128CMFX-3.0/NOPB is rated for up to 20 mA continuous output current. Power dissipation must be verified: at 20 mA and 3.0 V, PD = 60 mW. With θJ-A = 220°C/W and TA = 85°C, junction temperature stays within 125°C limit assuming standard PCB copper.
Is the LM4128CMFX-3.0/NOPB qualified for automotive applications?
No - LM4128CMFX-3.0/NOPB is the commercial-grade variant. Automotive-qualified versions are designated LM4128Q (e.g., LM4128CQMF-3.0/NOPB), which undergo AEC-Q100 Grade 1 stress testing and are manufactured on automotive-grade process flow.
LM4128CMFX-3.0/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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128CMFX-3.0/NOPB FAQ
1.How can I place an order for LM4128CMFX-3.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMFX-3.0/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 LM4128CMFX-3.0/NOPB reliable?
The price and inventory of LM4128CMFX-3.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CMFX-3.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CMFX-3.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMFX-3.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMFX-3.0/NOPB?
LM4128CMFX-3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMFX-3.0/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 LM4128CMFX-3.0/NOPB?
For technical support, including LM4128CMFX-3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMFX-3.0/NOPB requirements.
6.How does Aetrix verify that LM4128CMFX-3.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CMFX-3.0/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 LM4128CMFX-3.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CMFX-3.0/NOPB?
All LM4128CMFX-3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMFX-3.0/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 LM4128CMFX-3.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128CMFX-3.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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