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Texas Instruments LM4128BMF-4.1/NOPB
- Part No.:
- LM4128BMF-4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMF-4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,583
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Product details
Overview
LM4128BMF-4.1/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 4.096 V output with ±0.2% initial accuracy (B grade), 75 ppm/°C temperature coefficient, and 60 µA supply current. It supports 20 mA output load, features an enable pin for 3 µA shutdown mode, and operates from −40°C to +125°C - ideal for high-resolution ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4128BMF-4.1/NOPB datasheet, LM4128BMF-4.1/NOPB pinout, LM4128BMF-4.1/NOPB application, or LM4128BMF-4.1/NOPB equivalent, key selection criteria include its 4.096 V nominal output matching common 12-bit DAC full-scale references, low dropout (≤400 mV at 10 mA), stability with up to 10 µF capacitive loads, and AEC-Q100–compatible automotive-grade variants.
Technical Context
The LM4128BMF-4.1/NOPB uses a band-gap–based series reference architecture with internal enable control logic and rail-to-rail input compliance down to VREF + 400 mV. Its design eliminates need for external stabilization capacitors while maintaining stability with ceramic output capacitance up to 10 µF.
It integrates indefinite short-circuit protection (75 mA limit), exhibits 350 µVPP low-frequency (0.1–10 Hz) noise at 4.096 V output, and achieves ≤75 ppm/°C tempco across −40°C to +125°C for B-grade devices - verified via box-method measurement per SNVS475E.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V ±0.2% (B grade) - matches standard 12-bit DAC full-scale reference and enables direct interface without scaling. |
| Initial Accuracy | ±0.2% at 25°C - ensures ≤8.2 mV absolute error in 4.096 V output, critical for <12-bit system accuracy. |
| Tempco | 75 ppm/°C max (−40°C to +125°C) - contributes ≤0.375 mV drift over full range, supporting precision sensor signal chains. |
| Supply Current | 60 µA typical - enables multi-year battery life in always-on monitoring systems drawing <100 µA total. |
| Shutdown Current | 3–7 µA with EN = 0 V - allows dynamic power gating in duty-cycled data loggers without external switches. |
| Dropout Voltage | 175–400 mV at 10 mA load - permits operation from single-cell Li-ion (3.0–4.2 V) or regulated 4.5 V rails with margin. |
| Noise (0.1–10 Hz) | 350 µVPP - limits RMS noise contribution to <120 nV/√Hz, preserving ENOB in 16-bit SAR ADCs. |
Pinout & Package
LM4128BMF-4.1/NOPB is housed in a 5-pin SOT-23 (DBV) package (2.9 mm × 1.6 mm × 1.15 mm), RoHS-compliant, with Sn lead finish and MSL Level-1 rating. Pin 1 is N/C (no connect); pins are arranged top-view as: Pin 1=N/C, Pin 2=GND, Pin 3=EN, Pin 4=VIN, Pin 5=VREF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must remain unconnected and floating; no PCB trace or pad required - avoids parasitic coupling paths. |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference current and load current; requires low-impedance connection to clean analog ground plane. |
| Pin 3 (EN) | Digital enable input | Active-high control: VIH ≥65% VIN, VIL ≤35% VIN; internal 2 µA pull-up allows direct tie-to-VIN for always-on operation. |
| Pin 4 (VIN) | Input supply | Accepts 4.496 V to 5.5 V (VREF + 400 mV min); supplies internal band-gap core and output buffer. |
| Pin 5 (VREF) | Precision reference output | 4.096 V source capable of sourcing up to 20 mA; stable with 0–10 µF ceramic capacitive loads (X5R/X7R). |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces quiescent current to ≤7 µA, enabling firmware-managed power cycling in IoT edge nodes without hardware redesign. |
| Capacitor-free stability | Operates stably with no output capacitor - simplifies layout in space-constrained medical wearables where board area is premium. |
| Low 0.1–10 Hz noise | 350 µVPP output noise ensures <0.0085% peak-to-peak error in 4.096 V reference, meeting Class I precision instrument requirements. |
| Indefinite short-circuit protection | Self-limits output current to 75 mA during fault conditions - prevents thermal runaway and enables robust field-deployed test equipment. |
| Wide temperature operation | Specified performance from −40°C to +125°C junction temperature - supports under-hood automotive sensors and industrial motor drives. |
Applications
| Portable Data Acquisition | Automotive Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter acquiring 16-bit ADC samples at 1 kSPS. IC Role / Device Role / Timing Role: Primary voltage reference for SAR ADC front-end, setting full-scale range and offset calibration baseline. Use Value: 60 µA supply current extends 2xAA alkaline battery life beyond 18 months; 4.096 V output directly maps to 212 LSB steps without gain adjustment. |
Use Scenario: Engine control unit measuring exhaust gas oxygen concentration via wideband lambda sensor. IC Role / Device Role / Timing Role: Stable excitation reference for sensor heater driver and ratiometric ADC measurement circuitry. Use Value: 75 ppm/°C tempco ensures <±0.5% sensor reading drift over −40°C to +125°C ambient, meeting ISO 16750-4 requirements. |
| Medical Patient Monitor Analog Front-End | Industrial PLC Analog Input Module |
|
Use Scenario: Portable ECG device digitizing biopotential signals with 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Low-noise reference for ADC reference input and programmable gain amplifier bias network. Use Value: 350 µVPP 0.1–10 Hz noise contributes <0.001% of full-scale error, preserving >110 dB SNR in clinical-grade measurements. |
Use Scenario: DIN-rail mounted PLC module converting 4–20 mA field signals to digital values for process control. IC Role / Device Role / Timing Role: Precision reference for current-to-voltage conversion resistor network and isolation amplifier feedback path. Use Value: ±0.2% initial accuracy and 50 ppm long-term stability (1000 hrs) ensure <0.1% measurement uncertainty over 10-year product lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3040AIDBZR | 4.096 V, ±0.2% initial accuracy, 100 ppm/°C max tempco, 50 µA IQ, SOT-23-3 package (no EN pin) | Lacks enable functionality and has higher tempco; requires external shutdown switch for ultra-low-power modes | Select when board space is constrained and enable control is unnecessary; verify thermal drift budget allows 100 ppm/°C. |
| ADR3440ARJZ-R7 | 4.096 V, ±0.1% initial accuracy, 30 ppm/°C max tempco, 120 µA IQ, SOT-23-5 package with EN pin | Lower tempco and tighter accuracy but doubles supply current; same pinout compatibility with LM4128BMF-4.1/NOPB | Select when highest stability is required and 60 µA vs 120 µA IQ trade-off is acceptable; pin-compatible drop-in replacement. |
Compared with REF3040AIDBZR, LM4128BMF-4.1/NOPB provides integrated enable control and lower tempco (75 vs 100 ppm/°C), while ADR3440ARJZ-R7 offers superior accuracy and stability at higher quiescent current - making LM4128BMF-4.1/NOPB optimal for cost-sensitive, battery-powered designs needing balanced performance.
Availability
LM4128BMF-4.1/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, medical patient monitors, and industrial PLC analog input circuits requiring stable component supply and guaranteed long-term availability.
Supply support for LM4128BMF-4.1/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 reliability validation.
LM4128BMF-4.1/NOPB belongs to TI's precision micropower voltage reference product line, engineered for high-accuracy, low-drift, low-power applications in space-constrained and battery-operated systems across industrial, medical, and automotive markets.
FAQ
What is the output voltage tolerance of LM4128BMF-4.1/NOPB over temperature?
The LM4128BMF-4.1/NOPB delivers 4.096 V output with ±0.2% initial accuracy at 25°C and a maximum temperature coefficient of 75 ppm/°C across −40°C to +125°C. This results in a worst-case total error of ±0.2% + (75 ppm/°C × 165°C) ≈ ±0.324%, or ±13.3 mV, which is fully specified and tested per SNVS475E.
Does LM4128BMF-4.1/NOPB require an input capacitor?
Yes, LM4128BMF-4.1/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) connected between VIN and GND. Per TI's SNVS475E datasheet, CIN must be ≥ COUT if an output capacitor is used; omitting CIN risks instability and degraded noise performance, especially under transient load conditions.
Can LM4128BMF-4.1/NOPB drive a 10 µF capacitive load?
Yes, LM4128BMF-4.1/NOPB is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, including low-ESR ceramic types (X5R/X7R). This capability eliminates need for external isolation resistors and simplifies design of low-noise, fast-settling reference buffers in high-resolution data acquisition systems.
What is the shutdown current of LM4128BMF-4.1/NOPB?
The LM4128BMF-4.1/NOPB draws 3–7 µA supply current when the EN pin is driven low (0 V), placing it in shutdown mode. This specification is tested and guaranteed across −40°C to +125°C, enabling reliable ultra-low-power sleep states in battery-powered edge devices without external power switches.
Is LM4128BMF-4.1/NOPB qualified for automotive applications?
LM4128BMF-4.1/NOPB is not AEC-Q100 qualified; however, the LM4128Q series (e.g., LM4128BQMF-4.1/NOPB) is AEC-Q100 Grade 1 qualified and manufactured on an automotive-grade flow. For automotive use, specify the Q-suffix variant - LM4128BMF-4.1/NOPB is intended for industrial and commercial applications only.
LM4128BMF-4.1/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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 350µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.496V ~ 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
LM4128BMF-4.1/NOPB FAQ
1.How can I place an order for LM4128BMF-4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMF-4.1/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 LM4128BMF-4.1/NOPB reliable?
The price and inventory of LM4128BMF-4.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BMF-4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BMF-4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMF-4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMF-4.1/NOPB?
LM4128BMF-4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMF-4.1/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 LM4128BMF-4.1/NOPB?
For technical support, including LM4128BMF-4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMF-4.1/NOPB requirements.
6.How does Aetrix verify that LM4128BMF-4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BMF-4.1/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 LM4128BMF-4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BMF-4.1/NOPB?
All LM4128BMF-4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMF-4.1/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 LM4128BMF-4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4128BMF-4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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