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Texas Instruments LM4128BMF-1.8/NOPB
- Part No.:
- LM4128BMF-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMF-1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,785
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Product details
Overview
LM4128BMF-1.8/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 1.8 V output with ±0.2% initial accuracy (B grade), 75 ppm/°C max temperature coefficient, and 60 µA supply current. It features an enable pin for 3 µA shutdown mode and supports up to 20 mA load current - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128BMF-1.8/NOPB datasheet, LM4128BMF-1.8/NOPB pinout, LM4128BMF-1.8/NOPB application, or LM4128BMF-1.8/NOPB equivalent, key selection criteria include dropout voltage (200–400 mV at 10 mA), line regulation (30 ppm/V), load regulation (25–120 ppm/mA), and stability with capacitive loads up to 10 µF without external compensation.
Technical Context
The LM4128BMF-1.8/NOPB uses a band-gap-derived reference core optimized for low quiescent current and high PSRR. Its enable-controlled architecture allows seamless integration into power-gated subsystems, with guaranteed operation from VIN = VREF + 400 mV (i.e., ≥2.2 V) up to 5.5 V.
Designed for direct replacement of shunt references in space-constrained layouts, it eliminates need for external stabilization capacitors while maintaining stability with ceramic COUT up to 10 µF. Thermal hysteresis is limited to 75 ppm over −40°C to +125°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.2% initial accuracy (B grade) - ensures ≤±3.6 mV absolute error at 25°C for 12-bit ADC biasing |
| Tempco | 75 ppm/°C max - contributes ≤±13.5 mV drift across −40°C to +125°C operating range |
| Supply Current | 60 µA typical - enables >1-year runtime on a 200 mAh coin cell in always-on sensor nodes |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces standby power by >95% vs active mode |
| Dropout Voltage | 200–400 mV at 10 mA load - supports operation from single Li-ion cell (3.0–4.2 V) or 2xAA alkaline (2.4–3.2 V) |
| Load Regulation | 25–120 ppm/mA - maintains ≤±0.22 mV output shift when sourcing 0–20 mA |
| Noise (0.1–10 Hz) | 170 µVPP - suitable for 16-bit SAR ADC reference without additional filtering |
Pinout & Package
LM4128BMF-1.8/NOPB is housed in a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, JEDEC MO-178 compliant, and RoHS-compliant matte tin lead finish. Pin 1 is N/C (no connect); pin 2 is GND; pin 3 is EN; pin 4 is VIN; pin 5 is VREF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must remain unconnected and floating - no internal connection; PCB pad may be omitted |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference core and enable circuitry; requires low-impedance connection to system AGND |
| 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 2.2 V to 5.5 V; must exceed VREF by ≥400 mV at full load to maintain regulation |
| Pin 5 (VREF) | Precision output | 1.8 V reference source capable of sourcing/sinking up to ±20 mA; stable with 0–10 µF ceramic capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to ≤7 µA, enabling ultra-low-power sleep states in portable instrumentation |
| No external capacitor required | Stable with zero output capacitance - simplifies layout and eliminates ESR sensitivity in space-critical designs |
| Low dropout operation | Functions down to VIN = 2.2 V at 10 mA load - extends usable battery voltage range in coin-cell applications |
| Capacitive load drive | Drives up to 10 µF ceramic output capacitance - improves transient response for dynamic ADC sampling bursts |
| Industrial temperature range | Specified from −40°C to +125°C junction - supports deployment in automotive engine control and industrial PLC modules |
Applications
| Portable Data Loggers | Medical Sensor Front-Ends |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 1-second intervals. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for 16-bit sigma-delta ADC and microcontroller VREF input. Use Value: Enables <±0.01% total measurement error over temperature and battery discharge, extending field calibration interval to 2 years. |
Use Scenario: Wearable ECG patch measuring sub-millivolt cardiac signals with low-noise analog front-end. IC Role / Device Role / Timing Role: Supplies clean, low-drift reference for instrumentation amplifier gain-setting and ADC conversion. Use Value: 170 µVPP (0.1–10 Hz) noise and 75 ppm/°C tempco preserve signal integrity for <1 µV resolution measurements. |
| Automotive Cabin Controllers | Industrial Process Transmitters |
|
Use Scenario: HVAC control module in vehicle cabin monitoring CO₂, VOC, and ambient temperature under varying thermal conditions. IC Role / Device Role / Timing Role: Reference source for ratiometric sensor excitation and ADC reference in ASIL-B compliant subsystem. Use Value: −40°C to +125°C operation and 75 ppm/°C tempco ensure consistent sensor scaling across engine-off to engine-running thermal cycles. |
Use Scenario: 4–20 mA loop-powered pressure transmitter deployed in chemical plant environments. IC Role / Device Role / Timing Role: Precision voltage reference for DAC output stage and sensor bridge excitation in isolated analog signal chain. Use Value: 0.2% initial accuracy and 50 ppm long-term stability (1000 hrs) minimize factory recalibration frequency and reduce maintenance cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3018AIDBZR | Fixed 1.8 V, 50 ppm/°C max tempco, 50 µA IQ, SOT-23-3 - no enable pin, lower quiescent current but no shutdown mode | Lacks enable control; unsuitable for duty-cycled systems requiring deep sleep states | Select when minimal IQ is critical and enable functionality is unnecessary |
| ADR3418ARTZ-R7 | 1.8 V, 10 ppm/°C max tempco, 120 µA IQ, SOT-23-5 - higher accuracy and stability, but 2× higher supply current | Better for metrology-grade instruments where long-term drift dominates power budget | Select when ±0.05% initial accuracy and <10 ppm/°C tempco justify increased IQ and cost |
Compared with REF3018AIDBZR and ADR3418ARTZ-R7, LM4128BMF-1.8/NOPB uniquely balances B-grade accuracy (±0.2%), enable-controlled shutdown (≤7 µA), and SOT-23-5 compatibility - making it optimal for cost-sensitive, battery-operated industrial sensors needing moderate precision and flexible power management.
Availability
LM4128BMF-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, medical sensor front-ends, and automotive cabin controllers requiring stable component supply with guaranteed long-term availability.
Supply support for LM4128BMF-1.8/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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and broad industrial portfolio coverage.
LM4128BMF-1.8/NOPB belongs to TI's precision series voltage reference product line, designed specifically for space-constrained, low-power applications demanding high initial accuracy, low tempco, and robust capacitive-load stability without external compensation.
FAQ
What is the minimum input voltage required for LM4128BMF-1.8/NOPB to regulate properly?
The LM4128BMF-1.8/NOPB requires VIN ≥ VREF + 400 mV, i.e., ≥2.2 V at 10 mA load. At lighter loads, dropout decreases - e.g., 200 mV typical at 10 mA - but design margin should retain the 400 mV minimum to ensure regulation across temperature and process variation. Below this threshold, output voltage collapses nonlinearly.
Does LM4128BMF-1.8/NOPB require an input capacitor, and if so, what value is recommended?
Yes - LM4128BMF-1.8/NOPB requires a minimum 0.1 µF ceramic input capacitor (X5R/X7R) per TI SNVS475E. When using an output capacitor (COUT), CIN must satisfy CIN ≥ COUT. For best noise performance and startup overshoot suppression, 4.7–22 µF input capacitance is recommended, placed close to the VIN and GND pins.
Can LM4128BMF-1.8/NOPB drive a 10 µF ceramic output capacitor without instability?
Yes - LM4128BMF-1.8/NOPB is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, including low-ESR ceramic types. This eliminates need for series resistance or external compensation, distinguishing it from many older references that require careful COUT selection or damping networks.
What is the maximum load current LM4128BMF-1.8/NOPB can source while maintaining specification?
LM4128BMF-1.8/NOPB is specified to source up to 20 mA while maintaining output voltage accuracy within its load regulation spec (25–120 ppm/mA). Beyond 20 mA, short-circuit protection limits output current to ~75 mA, but regulation is not guaranteed - design must limit steady-state load to ≤20 mA for full parameter compliance.
How does the enable pin (EN) function on LM4128BMF-1.8/NOPB, and what logic levels activate it?
The EN pin on LM4128BMF-1.8/NOPB is active-high with internal ~2 µA pull-up. It activates (enables output) when voltage exceeds 65% of VIN (VIH), and disables (enters 3–7 µA shutdown) when pulled below 35% of VIN (VIL). Leaving EN unconnected defaults to enabled state via internal pull-up - no external resistor needed for always-on use.
LM4128BMF-1.8/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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 170µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.2V ~ 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-1.8/NOPB FAQ
1.How can I place an order for LM4128BMF-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMF-1.8/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-1.8/NOPB reliable?
The price and inventory of LM4128BMF-1.8/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-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BMF-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMF-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMF-1.8/NOPB?
LM4128BMF-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMF-1.8/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-1.8/NOPB?
For technical support, including LM4128BMF-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMF-1.8/NOPB requirements.
6.How does Aetrix verify that LM4128BMF-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BMF-1.8/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-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BMF-1.8/NOPB?
All LM4128BMF-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMF-1.8/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-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4128BMF-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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