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Texas Instruments LM4128BMFX-2.0/NOPB
- Part No.:
- LM4128BMFX-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMFX-2.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,731
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Product details
Overview
LM4128BMFX-2.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 2.048 V output with ±0.2% initial accuracy (Grade B), 75 ppm/°C max temperature coefficient, and 60 µA supply current. It operates from VIN ≥ 2.448 V (VREF + 400 mV) up to 5.5 V, supports 20 mA load current, and features an enable pin for 3–7 µA shutdown mode - ideal for battery-powered data acquisition and portable instrumentation.
For engineers reviewing the LM4128BMFX-2.0/NOPB datasheet, LM4128BMFX-2.0/NOPB pinout, LM4128BMFX-2.0/NOPB application, or LM4128BMFX-2.0/NOPB equivalent, key selection criteria include its Grade B accuracy vs. Grade A/C/D variants, dropout behavior at light loads, stability with 0–10 µF capacitive loads, and compatibility with low-ESR ceramic bypassing without external compensation.
Technical Context
The LM4128BMFX-2.0/NOPB uses a band-gap-derived architecture optimized for low quiescent current and high PSRR across frequency. Its internal enable circuit includes a 2 µA pull-up, allowing direct connection to VIN or external logic-level control.
It achieves stable operation without mandatory output capacitance but improves transient response with COUT ≤ 10 µF; input capacitor CIN ≥ COUT (min 0.1 µF) is required. Dropout voltage is specified at 175–400 mV over 10 mA load and temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal, ±0.2% initial tolerance (Grade B) - enables 12-bit ADC full-scale alignment without trimming |
| Tempco | 75 ppm/°C max (−40°C to +125°C) - ensures <±240 µV drift over industrial temperature range |
| Supply Current | 60 µA typical (100 µA max) - supports >1-year battery life in 10 µA-sleep systems with periodic wake-up |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces system standby power by >90% vs active mode |
| 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 rails with margin |
| Load Regulation | 25–120 ppm/mA - maintains <±250 µV error across 0–20 mA output swing |
| Noise (0.1–10 Hz) | 190 µVPP - suitable for 16-bit SAR ADC reference without additional filtering |
Pinout & Package
LM4128BMFX-2.0/NOPB is housed in a 5-pin SOT-23 (DBV) package (2.9 mm × 1.6 mm × 1.15 mm), RoHS-compliant, with moisture sensitivity level (MSL) 1 and peak reflow rating of 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected and floating; no PCB trace or pad required |
| 2 - GND | Analog ground reference | Primary return path for reference output and internal bias; requires low-impedance connection to clean AGND plane |
| 3 - EN | Enable control input | Active-high logic input; VIH ≥ 65% VIN, VIL ≤ 35% VIN; internal 2 µA pull-up allows direct tie-to-VIN |
| 4 - VIN | Input supply rail | Accepts 2.448 V to 5.5 V; must be bypassed with ≥0.1 µF ceramic capacitor (CIN) placed adjacent to pin |
| 5 - VREF | Precision reference output | Delivers regulated 2.048 V; stable with 0–10 µF capacitive loads; optional COUT improves load transient recovery |
Key Features
| Feature | Design Value |
|---|---|
| No external stabilization capacitor required | Eliminates need for output capacitor while maintaining stability - reduces BOM count and board area in space-constrained designs |
| Capacitive load drive up to 10 µF | Enables use with large local decoupling or noise-filtering caps on downstream ADCs or DACs without oscillation risk |
| Low dropout voltage (175 mV min) | Permits operation from low-voltage rails (e.g., 2.5 V or single Li-ion) while preserving regulation margin under load |
| Stable with low-ESR ceramic capacitors | Supports X5R/X7R MLCCs only - avoids instability risks associated with tantalum or high-ESR electrolytics |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault - prevents thermal runaway and enables robust field deployment |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure with 16-bit ADC sampling every 10 seconds. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion, providing stable 2.048 V scale with minimal drift over −25°C to +70°C ambient. Use Value: Enables ±0.5 LSB accuracy over temperature without calibration, extending battery life via 60 µA quiescent draw and EN-controlled sleep cycles. |
Use Scenario: 4–20 mA loop-powered transmitter converting RTD or strain gauge signals in factory automation. IC Role / Device Role / Timing Role: Precision excitation and reference source for bridge sensing and analog front-end, operating from limited loop power budget. Use Value: Delivers 75 ppm/°C tempco and 25 ppm/mA load regulation - maintains <0.1% total error across full 4–20 mA output range and temperature extremes. |
| Medical Patient Monitors | Test & Measurement Equipment |
|
Use Scenario: Portable ECG module requiring sub-microvolt baseline stability and low-noise analog signal chain. IC Role / Device Role / Timing Role: Reference for high-resolution SAR ADC and programmable gain amplifier, powering critical signal conditioning stages. Use Value: 190 µVPP (0.1–10 Hz) noise and 50 ppm long-term stability over 1000 hrs ensure clinical-grade measurement repeatability. |
Use Scenario: Benchtop multimeter with auto-ranging 24-bit delta-sigma ADC and dual-supply analog section. IC Role / Device Role / Timing Role: Low-drift reference for internal DAC-based calibration and ADC reference switching between ranges. Use Value: ±0.2% initial accuracy and thermal hysteresis ≤75 ppm allow factory calibration validity for 12 months without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4128AMFX-2.0/NOPB | Grade A (±0.1% initial accuracy, same 75 ppm/°C tempco); otherwise identical pinout, specs, and package | Required where 12-bit+ systems demand tighter initial tolerance without post-manufacture trimming | Select when absolute initial accuracy is prioritized over cost; same layout and firmware integration |
| REF3020AIDBZR | 2.048 V, ±0.2% initial accuracy, 50 ppm/°C tempco, 50 µA IQ, SOT-23-3 (no EN pin), no shutdown mode | Suitable for always-on, ultra-low-power references where enable control is unnecessary and board space is constrained | Choose when EN functionality is not needed and lower tempco is critical; requires redesign for 3-pin footprint and no EN routing |
Compared with LM4128BMFX-2.0/NOPB, the LM4128AMFX-2.0/NOPB offers higher initial accuracy at identical form factor and feature set, while REF3020AIDBZR trades enable capability and 5-pin flexibility for lower tempco and smaller 3-pin package - making each optimal for distinct trade-offs in accuracy, power sequencing, and layout density.
Availability
LM4128BMFX-2.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical monitoring systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4128BMFX-2.0/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 product line delivers micropower, low-drift series voltage references for battery-operated and space-constrained systems - designed specifically for high-accuracy data conversion, sensor excitation, and calibration-critical applications.
FAQ
What is the minimum input voltage required for stable operation of LM4128BMFX-2.0/NOPB?
The LM4128BMFX-2.0/NOPB requires VIN ≥ VREF + 400 mV = 2.448 V at 10 mA load to maintain regulation within specification. At lighter loads, dropout decreases - down to 175 mV - but 2.448 V remains the guaranteed minimum for full 20 mA capability across temperature. Below this, output voltage drops nonlinearly.
Does LM4128BMFX-2.0/NOPB require an output capacitor (COUT) for stability?
No, LM4128BMFX-2.0/NOPB is internally compensated and stable with 0 µF output capacitance. However, adding COUT (≤10 µF, low-ESR ceramic) significantly improves load transient response - especially during step-load changes from 0 to 20 mA - without risking instability.
How does the enable (EN) pin function on LM4128BMFX-2.0/NOPB?
The EN pin on LM4128BMFX-2.0/NOPB is active-high with internal 2 µA pull-up. Driving EN ≥ 65% of VIN enables the reference; pulling EN ≤ 35% of VIN disables it, reducing supply current to 3–7 µA. Leaving EN unconnected defaults to enabled state due to internal pull-up.
What is the maximum capacitive load LM4128BMFX-2.0/NOPB can drive reliably?
LM4128BMFX-2.0/NOPB is characterized and guaranteed stable with capacitive loads up to 10 µF. This includes standard X5R/X7R ceramic capacitors. Loads exceeding 10 µF may cause ringing or overshoot in transient response but do not induce oscillation per TI characterization.
Is LM4128BMFX-2.0/NOPB suitable for automotive applications?
LM4128BMFX-2.0/NOPB is not AEC-Q100 qualified. For automotive use, TI offers the LM4128Q series (e.g., LM4128BQMF-2.0/NOPB), which is AEC-Q100 Grade 1 qualified (−40°C to +125°C) and manufactured on an automotive-grade flow - LM4128BMFX-2.0/NOPB is intended for industrial and commercial systems only.
LM4128BMFX-2.0/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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 190µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.448V ~ 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
LM4128BMFX-2.0/NOPB FAQ
1.How can I place an order for LM4128BMFX-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMFX-2.0/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 LM4128BMFX-2.0/NOPB reliable?
The price and inventory of LM4128BMFX-2.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BMFX-2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BMFX-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMFX-2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMFX-2.0/NOPB?
LM4128BMFX-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMFX-2.0/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 LM4128BMFX-2.0/NOPB?
For technical support, including LM4128BMFX-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMFX-2.0/NOPB requirements.
6.How does Aetrix verify that LM4128BMFX-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BMFX-2.0/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 LM4128BMFX-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BMFX-2.0/NOPB?
All LM4128BMFX-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMFX-2.0/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 LM4128BMFX-2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128BMFX-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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