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Texas Instruments LM4128AMF-1.8/NOPB
- Part No.:
- LM4128AMF-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMF-1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:8,404
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Product details
Overview
LM4128AMF-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 ±0.1% initial accuracy (A-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 output current - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128AMF-1.8/NOPB datasheet, LM4128AMF-1.8/NOPB pinout, LM4128AMF-1.8/NOPB application, or LM4128AMF-1.8/NOPB equivalent, key selection criteria include dropout voltage (200–400 mV at 10 mA), load regulation (25–120 ppm/mA), line regulation (30 ppm/V), thermal hysteresis (75 ppm), and long-term stability (50 ppm over 1000 hrs).
Technical Context
The LM4128AMF-1.8/NOPB uses a band-gap-derived reference core optimized for low quiescent current and high stability across −40°C to +125°C. Its internal enable logic allows full shutdown with only 3 µA supply current, while the output remains stable with capacitive loads up to 10 µF without requiring external compensation.
It operates with input voltage as low as VREF + 400 mV (i.e., ≥2.2 V) and up to 5.5 V, enabling use in single-cell Li-ion and multi-cell alkaline systems. The device exhibits 170 µVPP (0.1–10 Hz) output noise and maintains 0.5% output accuracy under varying line, load, and temperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.1% initial accuracy (A-grade) - ensures ≤1.8 mV absolute error at 25°C for 12-bit ADC biasing. |
| Tempco | 75 ppm/°C max - limits drift to ≤13.5 µV/°C over full range, critical for precision sensor signal chains. |
| Supply Current | 60 µA typical - enables >1-year battery life in 10 µA-sleep IoT nodes with periodic reference activation. |
| Shutdown Current | 3–7 µA - reduces system standby power when reference not actively needed, e.g., during MCU deep sleep. |
| Dropout Voltage | 200–400 mV at 10 mA - allows operation from 2.2 V input, compatible with discharged LiFePO₄ or dual-alkaline supplies. |
| Load Regulation | 25–120 ppm/mA - maintains <0.22 mV shift from 0 to 20 mA load, suitable for driving ADC reference inputs and op-amp bias networks. |
| Noise (0.1–10 Hz) | 170 µVPP - contributes <0.009% of full-scale error in 1.8 V reference, supporting 16-bit measurement resolution. |
Pinout & Package
LM4128AMF-1.8/NOPB is housed in a 5-pin SOT-23 (DBV) package with 1.6 mm × 2.9 mm footprint and 0.95 mm height, optimized for space-constrained PCB layouts. Pin 1 is no-connect (N/C); pins are arranged top-view with standard DBV pinout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect | Must be left floating; not internally bonded - avoids unintended coupling or ESD path. |
| 2 (GND) | Ground reference | Primary return path for reference output and supply current; requires low-impedance connection to clean analog ground plane. |
| 3 (EN) | Enable control input | Active-high logic: ≥65% of VIN enables output; ≤35% of VIN forces 3 µA shutdown - supports direct GPIO or resistor-divider control. |
| 4 (VIN) | Input supply | Accepts 2.2 V to 5.5 V; must exceed VREF by ≥400 mV for specified accuracy - decoupling capacitor (≥0.1 µF) required on this pin. |
| 5 (VREF) | Precision reference output | Delivers regulated 1.8 V; stable with 0–10 µF capacitive loads; drives up to 20 mA but optimized for low-current precision applications. |
Key Features
| Feature | Design Value |
|---|---|
| No external stabilization capacitor required | Eliminates need for output capacitor while remaining stable up to 10 µF - reduces BOM count and layout area in compact designs. |
| Low dropout voltage (200 mV typ) | Enables operation from near-threshold supplies (e.g., 2.0 V coin cells after aging), extending usable battery voltage range. |
| Stable with low-ESR ceramic capacitors | Supports X5R/X7R MLCCs without oscillation risk - simplifies capacitor selection and improves transient response vs. tantalum alternatives. |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault - prevents device damage and system-level latch-up in overcurrent events. |
| −40°C to +125°C operating range | Qualified for automotive and industrial environments where ambient temperature extremes impact reference stability and lifetime. |
Applications
| Portable Data Acquisition | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Handheld multimeter sampling analog front-end with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for ADC conversion and sensor excitation circuitry. Use Value: 75 ppm/°C tempco and 170 µVPP noise ensure <±0.01% measurement accuracy across 0–50°C operating range. |
Use Scenario: Portable gas detector using electrochemical sensor with ratiometric readout. IC Role / Device Role / Timing Role: Supplies precise 1.8 V bias to transimpedance amplifier and ADC reference input. Use Value: 60 µA quiescent current extends 2xAA battery life to >18 months in low-duty-cycle sampling mode. |
| Automotive Sensor Interface | Industrial Process Controller |
Use Scenario: Under-hood pressure sensor module operating at 125°C junction temperature. IC Role / Device Role / Timing Role: Delivers accurate 1.8 V reference for signal conditioning and microcontroller ADC. Use Value: AEC-Q100 Grade 1 qualification and 75 ppm/°C max tempco maintain calibration integrity over full automotive temperature range. |
Use Scenario: DIN-rail mounted PLC analog input module with 20-channel 12-bit ADC array. IC Role / Device Role / Timing Role: Serves as shared reference source for multiple ADC channels via low-impedance distribution network. Use Value: 20 mA output capability and 25 ppm/mA load regulation allow daisy-chained reference routing without gain error accumulation. |
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-23-5 - lower noise (12 µVRMS) but no enable pin. | Lacks shutdown mode; unsuitable for ultra-low-power wake-on-event architectures requiring reference gating. | Select REF3018AIDBZR when lowest possible noise dominates over dynamic power control needs. |
| MAX6029AEUR+T | 1.8 V, 75 ppm/°C max, 65 µA IQ, SOT-23-5 - includes enable pin but rated only to +85°C (not automotive). | Not qualified for −40°C to +125°C operation; limited thermal margin in high-ambient industrial enclosures. | Select MAX6029AEUR+T for cost-sensitive commercial applications where extended temperature range is unnecessary. |
Compared with REF3018AIDBZR and MAX6029AEUR+T, LM4128AMF-1.8/NOPB uniquely combines AEC-Q100 Grade 1 qualification, enable-controlled shutdown, and guaranteed 75 ppm/°C performance across −40°C to +125°C - making it the only choice for automotive and harsh-environment battery-powered systems requiring both precision and power-gating capability.
Availability
LM4128AMF-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor interfaces, and industrial process controllers requiring stable component supply with full temperature-range performance and long-term calibration integrity.
Supply support for LM4128AMF-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 IC design and automotive-grade qualification.
The LM4128 family was engineered specifically for space-constrained, battery-operated systems demanding high initial accuracy, low drift, and ultra-low quiescent current - targeting instrumentation, portable test equipment, and automotive sensor signal conditioning.
FAQ
What is the maximum input voltage for LM4128AMF-1.8/NOPB?
The LM4128AMF-1.8/NOPB supports a maximum input voltage of 5.5 V across its full operating temperature range. Exceeding this limit risks permanent damage per Absolute Maximum Ratings. Input voltage must also remain ≥2.2 V (VREF + 400 mV) to maintain specified output accuracy and regulation performance.
Does LM4128AMF-1.8/NOPB require an input capacitor?
Yes - a minimum 0.1 µF ceramic capacitor (X5R/X7R) is required on the VIN pin of LM4128AMF-1.8/NOPB to ensure stability and reduce power-supply noise coupling. Larger values (e.g., 4.7–22 µF) further improve startup overshoot and output noise, especially in noisy DC-DC supply environments.
What is the output voltage tolerance of LM4128AMF-1.8/NOPB over temperature?
The LM4128AMF-1.8/NOPB (A-grade) guarantees ±0.1% initial accuracy at 25°C and a maximum temperature coefficient of 75 ppm/°C over −40°C to +125°C. This results in total output variation of ≤±0.135% across the full range - equivalent to ±2.43 mV for the 1.8 V output.
Can LM4128AMF-1.8/NOPB drive a 10 µF capacitive load?
Yes - LM4128AMF-1.8/NOPB is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, whether used as an output filter or for improved transient response. No series resistance or external compensation is required, unlike many older reference designs.
Is LM4128AMF-1.8/NOPB qualified for automotive applications?
Yes - LM4128AMF-1.8/NOPB is part of the LM4128Q series and is AEC-Q100 Grade 1 qualified (−40°C to +125°C), manufactured on an automotive-grade flow. Its datasheet specifies performance and reliability validation per automotive stress-test standards, including thermal cycling and HTOL.
LM4128AMF-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:
- ±0.1%
- 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
LM4128AMF-1.8/NOPB FAQ
1.How can I place an order for LM4128AMF-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMF-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 LM4128AMF-1.8/NOPB reliable?
The price and inventory of LM4128AMF-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 LM4128AMF-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AMF-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMF-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMF-1.8/NOPB?
LM4128AMF-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMF-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 LM4128AMF-1.8/NOPB?
For technical support, including LM4128AMF-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMF-1.8/NOPB requirements.
6.How does Aetrix verify that LM4128AMF-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AMF-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 LM4128AMF-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AMF-1.8/NOPB?
All LM4128AMF-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMF-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 LM4128AMF-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4128AMF-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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