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Texas Instruments LM4128BMFX-1.8/NOPB
- Part No.:
- LM4128BMFX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMFX-1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,186
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Product details
Overview
LM4128BMFX-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 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 LM4128BMFX-1.8/NOPB datasheet, LM4128BMFX-1.8/NOPB pinout, LM4128BMFX-1.8/NOPB application, or LM4128BMFX-1.8/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The LM4128BMFX-1.8/NOPB is a band-gap-based series voltage reference with internal enable logic and no external stabilization capacitor required. Its architecture ensures stability with capacitive loads up to 10 µF while maintaining low dropout (200–400 mV at 10 mA) and low noise (170 µVPP, 0.1–10 Hz).
It operates across VIN = VREF + 400 mV to 5.5 V, supports shutdown via EN pin (VIH ≥65% VIN, VIL ≤35% VIN), and delivers specified performance over −40°C to +125°C junction temperature without derating - enabled by thermal hysteresis ≤75 ppm and long-term stability ≤50 ppm over 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.2% initial accuracy (B grade) - enables 12-bit ADC biasing with <0.5 LSB error at room temperature. |
| Temperature Coefficient | 75 ppm/°C max - ensures ≤±120 µV drift over −40°C to +125°C, critical for industrial sensor calibration. |
| Supply Current | 60 µA typical - allows >1-year operation on a 200 mAh coin cell in always-on monitoring applications. |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces system standby power by >90% vs active mode. |
| Dropout Voltage | 200–400 mV at 10 mA - permits use with 2.0 V Li-ion cells or low-dropout regulators in compact battery systems. |
| Load Regulation | 25–120 ppm/mA - maintains <±20 µV output shift across 0–20 mA load, supporting precision DAC buffers. |
| Output Noise | 170 µVPP (0.1–10 Hz) - meets <200 µVPP requirement for 16-bit SAR ADC reference inputs. |
Pinout & Package
LM4128BMFX-1.8/NOPB uses the 5-pin SOT-23 (DBV) package per TI package code DBV (R-PDSO-G5), with 1.27 mm pitch, 2.9 mm × 1.6 mm footprint, and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected and floating; no PCB trace or solder mask opening required. |
| 2 (GND) | Analog ground reference | Primary return path for reference current; requires low-impedance connection to clean analog ground plane. |
| 3 (EN) | Digital enable input | Active-high control: VIH ≥65% VIN enables output; VIL ≤35% VIN forces 3 µA shutdown state. |
| 4 (VIN) | Input supply rail | Accepts 2.2 V to 5.5 V; must exceed VREF + 400 mV (i.e., ≥2.2 V) for regulation at full load. |
| 5 (VREF) | Precision output node | Delivers stable 1.8 V; requires ≥0.1 µF ceramic CIN on VIN and optional COUT (≤10 µF) for transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces quiescent current to 3–7 µA, enabling ultra-low-power sleep modes in portable medical devices. |
| No external stabilization capacitor | Eliminates need for output bypass cap while remaining stable with up to 10 µF capacitive load - simplifies layout and saves board space. |
| Low dropout voltage | 200 mV min at 10 mA allows direct regulation from single-cell Li-ion (2.7–4.2 V) or 2.5 V system rails. |
| Stable with low-ESR ceramics | Supports X5R/X7R MLCCs down to 0.1 µF on input - avoids tantalum or electrolytic caps and associated reliability risks. |
| Industrial temperature range | −40°C to +125°C operation with guaranteed specs - suitable for under-hood automotive sensors and factory-floor PLC modules. |
Applications
| Portable Data Loggers | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Continuous 16-bit ADC sampling in handheld environmental monitors powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for SAR ADC conversion, directly tied to ADC REF+ input. Use Value: 60 µA supply current extends battery life beyond 18 months; 170 µVPP noise ensures <1 LSB error in 16-bit measurements. |
Use Scenario: Precision thermocouple signal conditioning in field-deployable calibrators with USB-C charging. IC Role / Device Role / Timing Role: Supplies excitation and reference for low-drift instrumentation amplifiers and sigma-delta ADC front-ends. Use Value: 75 ppm/°C tempco and −40°C to +125°C rating maintain <±0.1°C measurement accuracy across ambient extremes. |
| Automotive Cabin Sensors | Industrial Process Controllers |
Use Scenario: Occupant detection and air quality sensing in vehicle cabin modules operating from 12 V battery via LDO. IC Role / Device Role / Timing Role: Generates accurate 1.8 V bias for MEMS pressure and CO₂ sensor interfaces. Use Value: AEC-Q100 Grade 1 qualification (LM4128BQ variant) and 125°C junction rating ensure reliability in hot under-dash environments. |
Use Scenario: Analog I/O module in DIN-rail mounted PLCs requiring long-term calibration stability over 10+ years. IC Role / Device Role / Timing Role: Reference source for 4–20 mA transmitter DACs and isolated analog input channels. Use Value: 50 ppm long-term stability over 1000 hrs and 75 ppm thermal hysteresis minimize recalibration frequency in factory automation. |
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, ±0.2% initial accuracy, 100 ppm/°C tempco, 50 µA IQ, SOT-23-3 - no enable pin, 3-pin package. | Lacks shutdown capability; unsuitable for duty-cycled systems requiring µA-level standby current. | Select when board space is constrained and enable functionality is unnecessary; verify load regulation (150 ppm/mA) meets system tolerance. |
| MAX6029AEUR+T | 1.8 V, ±0.15% initial accuracy, 50 ppm/°C tempco, 35 µA IQ, SOT-23-5 - includes enable, but rated only to +85°C. | Not qualified for extended temperature industrial or automotive use; limited to commercial-grade embedded systems. | Choose for cost-sensitive consumer electronics where 125°C operation is not required and tighter initial accuracy justifies premium pricing. |
Compared with REF3018AIDBZR and MAX6029AEUR+T, LM4128BMFX-1.8/NOPB uniquely balances B-grade accuracy, full industrial temperature support, integrated enable, and proven stability with capacitive loads - making it the optimal choice for battery-constrained, high-reliability measurement systems requiring both precision and power flexibility.
Availability
LM4128BMFX-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial process controllers requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128BMFX-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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision analog ICs and industrial-grade power management solutions.
LM4128BMFX-1.8/NOPB belongs to TI's precision voltage reference product line, engineered specifically for space-constrained, low-power, high-accuracy applications in instrumentation, test equipment, and automotive subsystems.
FAQ
What is the maximum load current supported by LM4128BMFX-1.8/NOPB?
The LM4128BMFX-1.8/NOPB supports up to 20 mA output current while maintaining regulation within specifications. At 10 mA load, dropout voltage is guaranteed ≤400 mV; load regulation is specified as 25–120 ppm/mA, ensuring output deviation remains below ±20 µV across the full 0–20 mA range under defined conditions.
Does LM4128BMFX-1.8/NOPB require an external input capacitor?
Yes - LM4128BMFX-1.8/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) connected between VIN and GND. The datasheet specifies CIN ≥ COUT when an output capacitor is used, and larger values (4.7–22 µF) reduce startup overshoot and improve noise rejection. Failure to include CIN risks instability and degraded transient response.
What is the function of Pin 1 (N/C) on LM4128BMFX-1.8/NOPB?
Pin 1 of LM4128BMFX-1.8/NOPB is a no-connect (N/C) terminal with no internal connection. It must be left electrically floating - neither tied to ground nor routed on the PCB. TI's DBV package drawing confirms this pin is unbonded; connecting it may introduce parasitic leakage or mechanical stress affecting output stability.
How does the enable pin (EN) operate on LM4128BMFX-1.8/NOPB?
The EN pin on LM4128BMFX-1.8/NOPB is active-high with VIH ≥65% VIN and VIL ≤35% VIN. When pulled high (≥65% VIN), the device operates normally; when pulled low (≤35% VIN), it enters shutdown mode drawing only 3–7 µA. The internal pull-up (~2 µA) allows direct connection to VIN if external control is unnecessary.
Is LM4128BMFX-1.8/NOPB qualified for automotive applications?
The LM4128BMFX-1.8/NOPB itself is not AEC-Q100 qualified; however, its automotive-grade counterpart LM4128BQMF-1.8/NOPB is explicitly rated Grade 1 (−40°C to +125°C) and manufactured on TI's automotive flow. For automotive designs, LM4128BQMF-1.8/NOPB must be specified - the 'Q' suffix denotes automotive qualification and traceability.
LM4128BMFX-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
LM4128BMFX-1.8/NOPB FAQ
1.How can I place an order for LM4128BMFX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMFX-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 LM4128BMFX-1.8/NOPB reliable?
The price and inventory of LM4128BMFX-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 LM4128BMFX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BMFX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMFX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMFX-1.8/NOPB?
LM4128BMFX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMFX-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 LM4128BMFX-1.8/NOPB?
For technical support, including LM4128BMFX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMFX-1.8/NOPB requirements.
6.How does Aetrix verify that LM4128BMFX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BMFX-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 LM4128BMFX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BMFX-1.8/NOPB?
All LM4128BMFX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMFX-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 LM4128BMFX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4128BMFX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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