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Texas Instruments LM4128BQ1MFX3.0/NOPB
- Part No.:
- LM4128BQ1MFX3.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BQ1MFX3.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,697
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Product details
Overview
LM4128BQ1MFX3.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 3.0 V output with ±0.2% initial accuracy, 75 ppm/°C 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 automotive sensor signal conditioning.
For engineers reviewing the LM4128BQ1MFX3.0/NOPB datasheet, LM4128BQ1MFX3.0/NOPB pinout, LM4128BQ1MFX3.0/NOPB application, or LM4128BQ1MFX3.0/NOPB equivalent, key selection criteria include initial accuracy grade (B), dropout voltage (≤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 LM4128BQ1MFX3.0/NOPB uses an internal band-gap-derived reference architecture optimized for low quiescent current and high PSRR. Its enable-controlled operation allows seamless integration into power-gated systems, while the absence of required external stabilization capacitor simplifies layout.
It maintains output regulation across input voltages from 3.4 V (3.0 V + 400 mV) to 5.5 V and sustains 0.5% accuracy over load currents from 0 to 20 mA. Thermal hysteresis is limited to 75 ppm, and long-term stability is 50 ppm over 1000 hours - critical for precision ADC biasing and closed-loop calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V nominal, ±0.2% initial accuracy (B-grade) ensures ≤±6 mV absolute error at 25°C |
| Temperature Coefficient | 75 ppm/°C max over −40°C to +125°C → ≤22.5 mV drift across full range |
| Supply Current | 60 µA typical - enables multi-year battery life in always-on sensor nodes |
| Shutdown Current | 3 µA max when EN = 0 V - reduces system standby power by >95% |
| Dropout Voltage | 400 mV max at 10 mA load - supports operation from single Li-ion or 3.3 V rail |
| Load Regulation | 25–120 ppm/mA - maintains <±0.24 mV shift from 0 to 20 mA load step |
| Noise (0.1–10 Hz) | 285 µVPP - suitable for 16-bit SAR ADC reference without additional filtering |
Pinout & Package
LM4128BQ1MFX3.0/NOPB is housed in a 5-pin SOT-23 (DBV) package per JEDEC MO-178AB, with 0.95 mm pitch and 2.9 mm × 1.6 mm footprint. The no-connect (N/C) pin is electrically isolated and must remain floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No connect | Must be left unconnected; no internal bond wire or circuit connection |
| 2 (GND) | Ground reference | Primary return path for reference output and internal bias; requires low-impedance PCB plane |
| 3 (EN) | Enable control input | Active-high logic: ≥65% of VIN enables device; ≤35% disables into 3 µA shutdown |
| 4 (VIN) | Input supply | Accepts 3.4 V to 5.5 V; minimum headroom defined by dropout spec |
| 5 (VREF) | Precision reference output | 3.0 V regulated output capable of sourcing up to 20 mA; stable with COUT ≤10 µF |
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; eliminates BOM cost and board space for COUT |
| Low ESR ceramic compatibility | Works reliably with X5R/X7R MLCCs - avoids instability risks of tantalum or electrolytic caps |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault - prevents thermal runaway and enables safe recovery |
| Input capacitor requirement | CIN ≥ 0.1 µF mandatory; ensures startup integrity and suppresses supply noise coupling |
Applications
| Automotive Sensor Signal Conditioning | Portable Data Acquisition |
|---|---|
Use Scenario: Biasing and scaling analog outputs from pressure, temperature, and position sensors in engine control units. IC Role / Device Role / Timing Role: Provides stable 3.0 V reference for sensor excitation and ADC conversion in ASIL-B subsystems. Use Value: Enables <±0.1% measurement accuracy over temperature and lifetime, meeting ISO 26262 functional safety requirements. | Use Scenario: Powering handheld multimeters, environmental monitors, and field-deployed IoT edge nodes. IC Role / Device Role / Timing Role: Supplies precision reference for 16-bit sigma-delta ADCs and low-power microcontroller analog peripherals. Use Value: Delivers 285 µVPP low-frequency noise and 60 µA quiescent current - extends AA/AAA battery life beyond 2 years. |
| Industrial Process Control Transmitters | Battery Charger Voltage Regulation |
Use Scenario: Calibrating 4–20 mA loop-powered transmitters used in chemical plant flow and level monitoring. IC Role / Device Role / Timing Role: Serves as primary reference for DAC-based current loop drivers and HART modem biasing. Use Value: 75 ppm/°C tempco and 50 ppm long-term stability ensure calibration validity over 12-month maintenance cycles. | Use Scenario: Setting precise charge termination voltage in smart Li-ion battery chargers for medical devices. IC Role / Device Role / Timing Role: Generates accurate 3.0 V reference for comparator-based voltage threshold detection in charging IC feedback paths. Use Value: ±0.2% initial accuracy prevents overcharge risk and extends cell cycle life by maintaining ±6 mV tolerance on 3.0 V setpoint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AUT30+T | 3.0 V, ±0.1% initial accuracy, 3 ppm/°C tempco, 12 µA IQ, SOT-23-5 | Higher precision and lower drift, but no enable pin and not AEC-Q100 qualified | Select for lab-grade test equipment where ultra-low drift outweighs automotive compliance needs |
| ADR3430ARJZ-R7 | 3.0 V, ±0.1% initial accuracy, 10 ppm/°C tempco, 120 µA IQ, SOT-23-5 | Higher supply current and no shutdown mode; industrial temp range only (−40°C to +125°C) | Choose when lowest noise (12 µVPP) is critical and continuous operation is acceptable |
Compared with MAX6126AUT30+T and ADR3430ARJZ-R7, LM4128BQ1MFX3.0/NOPB uniquely combines AEC-Q100 Grade 1 qualification, enable-controlled shutdown, and 60 µA supply current - making it the only option among the three validated for automotive power-gated modules requiring both precision and functional safety compliance.
Availability
LM4128BQ1MFX3.0/NOPB is available at Aetrix Electronics and suitable for automotive sensor modules, portable instrumentation, industrial transmitters, and battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128BQ1MFX3.0/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 reference design and automotive-grade component validation.
The LM4128 product line delivers micropower, high-accuracy series voltage references for space-constrained, battery-operated, and safety-critical systems - specifically engineered for automotive, industrial, and portable measurement applications.
FAQ
What is the maximum input voltage for LM4128BQ1MFX3.0/NOPB?
The LM4128BQ1MFX3.0/NOPB supports a maximum input voltage of 5.5 V across its specified operating temperature range. Exceeding this limit risks permanent damage, as absolute maximum rating is 6 V. For reliable operation, VIN must also stay ≥3.4 V (3.0 V + 400 mV dropout) to maintain output regulation at full load. This makes LM4128BQ1MFX3.0/NOPB compatible with standard 3.3 V and 5 V rails while ensuring headroom for transient suppression.
Does LM4128BQ1MFX3.0/NOPB require an external output capacitor?
No, LM4128BQ1MFX3.0/NOPB is designed to operate stably without an external output capacitor and remains stable with capacitive loads up to 10 µF. An output capacitor (COUT) is optional and improves load transient response - especially during rapid 0–20 mA steps - but adds turn-on delay and is unnecessary for static reference applications. The mandatory input capacitor (CIN ≥0.1 µF) must still be placed close to the VIN pin.
What does the 'B' grade signify in LM4128BQ1MFX3.0/NOPB?
The 'B' in LM4128BQ1MFX3.0/NOPB denotes the initial accuracy grade: ±0.2% over temperature. This means the 3.0 V output will deviate no more than ±6 mV at 25°C before calibration, tighter than C-grade (±0.5%) and D-grade (±1.0%), but less stringent than A-grade (±0.1%). All B-grade units also meet the 75 ppm/°C max temperature coefficient and AEC-Q100 Grade 1 qualification required for automotive use.
How does the enable pin function on LM4128BQ1MFX3.0/NOPB?
The enable pin (EN, Pin 3) on LM4128BQ1MFX3.0/NOPB is active-high with TTL-compatible thresholds: VIH ≥65% of VIN enables normal operation, while VIL ≤35% of VIN forces shutdown with 3–7 µA supply current. The internal pull-up (~2 µA) allows direct connection to VIN for always-on use. EN must never exceed VIN; applying EN > VIN violates absolute maximum ratings and may damage the device.
Is LM4128BQ1MFX3.0/NOPB suitable for driving ADC reference inputs?
Yes, LM4128BQ1MFX3.0/NOPB is well-suited for driving precision ADC reference inputs, including 16-bit SAR and sigma-delta converters. With 285 µVPP (0.1–10 Hz) noise, ±0.2% initial accuracy, and 75 ppm/°C tempco, it supports effective resolution beyond 15 bits. Its ability to source 20 mA ensures adequate drive strength for reference buffers and decoupling networks - provided layout follows TI's recommendations for ground isolation and capacitor placement near the VREF pin.
LM4128BQ1MFX3.0/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:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°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
LM4128BQ1MFX3.0/NOPB FAQ
1.How can I place an order for LM4128BQ1MFX3.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BQ1MFX3.0/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 LM4128BQ1MFX3.0/NOPB reliable?
The price and inventory of LM4128BQ1MFX3.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BQ1MFX3.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BQ1MFX3.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BQ1MFX3.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BQ1MFX3.0/NOPB?
LM4128BQ1MFX3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BQ1MFX3.0/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 LM4128BQ1MFX3.0/NOPB?
For technical support, including LM4128BQ1MFX3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BQ1MFX3.0/NOPB requirements.
6.How does Aetrix verify that LM4128BQ1MFX3.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BQ1MFX3.0/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 LM4128BQ1MFX3.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BQ1MFX3.0/NOPB?
All LM4128BQ1MFX3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BQ1MFX3.0/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 LM4128BQ1MFX3.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128BQ1MFX3.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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